WO2022237769A1 - 一种具有洁净钢水功能的耐火材料、制备方法及其应用 - Google Patents
一种具有洁净钢水功能的耐火材料、制备方法及其应用 Download PDFInfo
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- WO2022237769A1 WO2022237769A1 PCT/CN2022/091933 CN2022091933W WO2022237769A1 WO 2022237769 A1 WO2022237769 A1 WO 2022237769A1 CN 2022091933 W CN2022091933 W CN 2022091933W WO 2022237769 A1 WO2022237769 A1 WO 2022237769A1
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Definitions
- the application relates to the technical field of refractory materials, in particular to a refractory material with the function of cleaning molten steel, a preparation method and its application.
- Non-metallic inclusions are not only related to the smelting process, but also It is closely related to the damage of refractory materials. During the refining process, the damage of the refractory material is very serious and the damage is rapid, which also causes more refractory material to enter the steel to form inclusions.
- refractory materials with the function of clean molten steel should have the following characteristics:
- Refractory materials have higher melting temperature and service temperature
- the refractory material has good resistance to slag erosion and slag penetration, the formation of metamorphic layer is slow, and the corrosion of slag is slow, so as to minimize the rate of entering molten steel;
- the raw material must have low oxygen potential, high temperature resistance and low reaction rate with slag at high temperature; secondly, the raw material must have the potential function of releasing C12A7 and purifying molten steel; then, the refractory material preparation technology must be innovative, It is necessary to ensure uniform structure and reduce the introduction of low-temperature sintering agent.
- the existing industrially applicable ladle lining refractories such as corundum-spinel castables, Al 2 O 3 -MgO-SiO 2 castables and other refractories themselves have no function of purifying molten steel, and such
- the raw materials used in refractory materials such as tabular alumina, white corundum, sub-white corundum, bauxite, mullite, etc., do not have the function of purifying molten steel.
- Raw materials do not have the function of purifying molten steel, and refractory materials naturally do not have the effect of purifying molten steel;
- CA6 material has low oxygen potential, high melting point, high service temperature, and very important function of potentially purifying molten steel.
- the bulk density of CA6 material is very low, so , the current calcium hexaaluminate-based castables all add TiO 2 , MnO, SiO 2 , Fe 2 O 3 and other sintering-promoting components, all at the expense of the high-temperature performance of the material, which not only greatly reduces the high-temperature performance of the material Performance, and the introduction of additives with high oxygen potential, so that the calcium hexaaluminate, which has a very low oxygen potential and does not pollute molten steel, adds harmful components;
- the volume density of castables with higher calcium hexaaluminate content is mostly 2.60-2.90g/cm 3 , the porosity is higher or even as high as 15-23%, the resistance to molten steel erosion is poor, and the damage speed is fast.
- a large amount of refractory materials entered the molten steel not only did not purify the molten steel, but polluted the molten steel;
- CA6 has the advantages of better thermal shock stability and better permeability resistance compared with the current traditional raw materials, based on the existing technology in the field of refractory materials, the introduction of calcium hexaaluminate cannot solve the problem of corrosion resistance and anti-corrosion properties.
- the contradiction between permeability and thermal shock stability is determined by the development concept of existing refractory materials; the development ideas and concepts have not changed, and it is difficult to solve the problem only by adding certain components.
- the calcium material system still has a relatively high porosity; (2) the calcium hexaaluminate raw material, due to its unique lamellar structure and anisotropic crystallization characteristics, is difficult to achieve sintering by its own particle diffusion, and it is necessary to add TiO 2 , MnO, SiO 2 , Fe 2 O 3 and other sintering-promoting components form a liquid phase at high temperature to add to the diffusion of particles, otherwise the raw material of calcium hexaaluminate has low density, high porosity and low strength, which cannot (3)
- the introduction of sintering-promoting components leads to a decrease in the purity and high-temperature performance of calcium hexaaluminate, especially the high-oxygen-potential sintering-promoting components lead to an increase in the oxygen potential of the material, resulting in deoxidation inclusions in molten steel and affecting the quality of the steel; (4) In view of the surface tension of the high-temperature liquid phase, although the s
- the present application provides a refractory material with the function of cleaning molten steel, a preparation method and an application thereof.
- This application is based on high-purity, high-corrosion-resistant raw materials, without adding sintering-promoting components, without generating a low-melting liquid phase, and without relying on liquid-phase sintering, to obtain high-purity, good corrosion resistance, and anti-slag Calcium hexaaluminate refractory products with good permeability and high thermal shock stability can reduce the amount of refractory materials eroded into molten steel, reduce the pollution of molten steel, and at the same time give full play to the performance advantages of high-purity raw materials;
- the refractory material with uniform material structure not only solves the structural stress of the refractory material as a whole, but also solves the anti-slag penetration performance, and realizes the coordination and unity of anti-permeability and thermal shock resistance; based on the crystal structure of CA6, The characteristics of phase and chemical
- a refractory material with clean molten steel function characterized in that the phase of said refractory material comprises one or more of CA6, CMA, corundum and ZrO2.
- the refractory material described in item 1 it is characterized in that, based on the percentage of the total mass of the refractory material, the total phase content of CA6, CMA, corundum and ZrO in the refractory material is ⁇ 90%; in,
- the CA6 phase content is 0-100%
- the CMA phase content is 0-100%
- the ZrO2 phase content is 0-35%, preferably 0-15%;
- the content of the corundum phase is 0-70%, preferably 0-30%;
- the total phase content of CA6 and CMA in the refractory material is 30% to 100%, preferably 55% to 100% or 52.5 to 100% %;
- the phase content of CA6 in the refractory material is 30% to 100%, preferably 52.5% to 100% or 55% to 100% .
- the refractory material according to item 1 or 2 characterized in that, based on the percentage of the total mass of the refractory material, the content of the sintering-promoting component in the refractory material is ⁇ 1.5%, preferably 0%.
- the chemical composition of the refractory material includes:
- Al 2 O 3 53.20%-97.13% or 55.72%-97.48% of Al 2 O 3 , preferably 71.06%-94.10% or 72.86%-94.12% of Al 2 O 3 ; more preferably 75.58%-94.10% of Al 2 O 3 .
- the refractory material according to any one of items 1-4 characterized in that the bulk density of the refractory material is 2.90-3.65 g/cm 3 , preferably 2.95-3.35 g/cm 3 .
- phase of the matrix part of the refractory material includes one or more of corundum, CA6, CMA and ZrO2 ;
- the content of the corundum phase is 0-100%, preferably 0-50%;
- the CA6 phase content is 0-100%
- the CMA phase content is 0-100%
- the ZrO2 phase content is 0-50%, preferably 0-25%;
- the total phase content of CA6 and CMA in the matrix part is 25% to 100%;
- the phase content of CA6 in the matrix part is 25% to 100%.
- the granular material and the fine powder are mixed to obtain a mixed material, and the mixed material is subjected to hot pressing and sintering to obtain the refractory material.
- the refractory material according to item 8 characterized in that the mass ratio of the granular material to the fine powder is 30-65:35-70; preferably 40-65:35-60.
- the fine powder also includes fine powder containing ZrO ;
- the fine powder comprises 50% to 100% of the Al 2 O 3 -CaO-MgO series fine powder and 0 to 50% of the fine powder containing ZrO 2 ;
- the fine powder contains 75% to 100% of Al 2 O 3 -CaO-MgO-based fine powder and 0 to 25% of fine powder containing ZrO 2 ;
- the Al 2 O 3 -CaO-MgO series fine powder is selected from CA6 fine powder, CMA fine powder, fine powder containing Al 2 O 3 , fine powder containing Al 2 O 3 and fine powder containing CaO.
- CA6 fine powder CMA fine powder
- fine powder containing Al 2 O 3 fine powder containing Al 2 O 3
- fine powder containing Al 2 O 3 fine powder containing CaO.
- the fine powder containing Al 2 O 3 is selected from active ⁇ -Al 2 O 3 fine powder, ⁇ -Al 2 O 3 fine powder, ⁇ -Al 2 O 3 fine powder, aluminum hydroxide fine powder, industrial One or more of alumina fine powder, white corundum fine powder, sintered corundum fine powder and tabular corundum fine powder;
- the MgO-containing fine powder is selected from magnesium carbonate fine powder, light-burned magnesia fine powder, brucite fine powder, magnesium hydroxide fine powder, magnesium chloride fine powder, sintered magnesia fine powder and fused magnesia One or more than two kinds of fine powder;
- the CaO-containing fine powder is selected from quicklime fine powder, limestone fine powder, calcium hydroxide fine powder, CaO ⁇ Al 2 O 3 fine powder, CaO ⁇ 2Al 2 O 3 fine powder, 12CaO ⁇ 7Al 2 O 3 One or more than two kinds of fine powder;
- the ZrO2 - containing fine powder is selected from one or more of monoclinic zirconia fine powder, tetragonal zirconia fine powder, desiliconized zirconia fine powder and fused zirconia fine powder.
- the refractory material according to any one of items 8-11 characterized in that the particle size of the fine powder is less than 0.088 mm, and the particle size of the granular material is 0.088-10 mm.
- the hot press sintering is putting the mixture into a mold of a high temperature device for hot press sintering; or,
- the mixture is molded at normal temperature and sintered at low temperature, and then put into a mold of a high temperature device for hot pressing and sintering.
- the refractory material according to items 8-13 characterized in that the temperature of the hot-press sintering is 1550-1800° C.; preferably, the pressure of the hot-press sintering is 0.5-30 MPa.
- the refractory material according to any one of items 8-14 characterized in that, based on the percentage of the total mass of the granular material, CaO, Al 2 O 3 and The total content of MgO is ⁇ 97.5%, and the bulk density of the granular material is ⁇ 2.90g/cm 3 .
- a method for preparing a refractory material comprising the steps of:
- the granular material and the fine powder are mixed to obtain a mixed material, and the mixed material is subjected to hot pressing and sintering to obtain the refractory material.
- the preparation method according to item 16 characterized in that the mass ratio of the granular material to the fine powder is 30-65:35-70, preferably 40-65:35-60.
- the fine powder also includes fine powder containing ZrO ;
- the fine powder comprises 50% to 100% of the Al 2 O 3 -CaO-MgO series fine powder and 0 to 50% of the fine powder containing ZrO 2 ;
- the fine powder contains 75% to 100% of Al 2 O 3 -CaO-MgO-based fine powder and 0 to 25% of fine powder containing ZrO 2 ;
- the Al 2 O 3 -CaO-MgO series fine powder is selected from CA6 fine powder, CMA fine powder, fine powder containing Al 2 O 3 , fine powder containing Al 2 O 3 and fine powder containing CaO.
- CA6 fine powder CMA fine powder
- fine powder containing Al 2 O 3 fine powder containing Al 2 O 3
- fine powder containing Al 2 O 3 fine powder containing CaO.
- the fine powder containing Al 2 O 3 is selected from active ⁇ -Al 2 O 3 fine powder, ⁇ -Al 2 O 3 fine powder, ⁇ -Al 2 O 3 fine powder, aluminum hydroxide fine powder, industrial One or more of alumina fine powder, white corundum fine powder, sintered corundum fine powder and tabular corundum fine powder;
- the MgO-containing fine powder is selected from one or more of magnesium carbonate, light-burned magnesia, brucite, magnesium hydroxide, magnesium chloride, sintered magnesia and fused magnesia;
- the CaO-containing fine powder is selected from quicklime fine powder, limestone fine powder, calcium hydroxide fine powder, CaO ⁇ Al 2 O 3 fine powder, CaO ⁇ 2Al 2 O 3 fine powder, 12CaO ⁇ 7Al 2 O 3 One or more than two kinds of fine powder;
- the ZrO2 - containing fine powder is selected from one or more of monoclinic zirconia, tetragonal zirconia, desiliconized zirconia and fused zirconia.
- the hot press sintering is putting the mixture into a mold of a high temperature device for hot press sintering; or,
- the mixture is molded at normal temperature and sintered at low temperature, and then put into a high-temperature device for hot-pressing sintering.
- a working lining of a ladle for molten steel smelting characterized in that it comprises the refractory material described in any one of items 1-15 or the refractory material prepared by the preparation method described in any one of items 16-23 .
- a working lining for molten aluminum smelting and transporting ladles characterized in that it comprises the refractory material described in any one of items 1-15 or prepared by the preparation method described in any one of items 16-23 refractory materials.
- a refractory lining for an industrial kiln characterized in that it comprises the refractory material described in any one of items 1-15 or the refractory material prepared by the preparation method described in any one of items 16-23. Material.
- the existing refractory materials whether it is castable or refractory bricks, have uneven distribution of pores; in order to alleviate the stress damage caused by temperature changes, there must be a large amount of porosity to counteract the uneven distribution of pores, which leads to Slag penetration is unavoidable and difficult to control; in order to enhance the resistance to slag erosion, only the purity of raw materials can be improved, and it is difficult for high-purity raw materials to achieve sintering only by particle diffusion, and the strength cannot be guaranteed; high-purity refractories
- the system can only achieve sintering and gain strength in the liquid phase by adding sintering aids, but the appearance of a low-melting liquid phase leads to a decrease in corrosion resistance. None of the currently available refractory materials and refractory raw materials has the potential function of purifying molten steel.
- the refractory material of the present application has the following advantages:
- the refractories provided by this application do not use any sintering-promoting components in the preparation process (the sintering-promoting components are SiO 2 , TiO 2 , Fe 2 O 3 , R 2 O, etc., wherein R 2 O is K 2 O and Na 2 O), the sintering is not achieved by liquid phase, but by high temperature and high pressure to promote particle rearrangement and particle diffusion. Therefore, the refractory material provided by this application has less high temperature liquid phase and uniform material structure , Thermal shock stability is good, and the erosion is uniform;
- the total content of sintering-promoting components such as SiO 2 , TiO 2 , Fe 2 O 3 , R 2 O (the general name of K 2 O and Na 2 O) introduced by raw materials is ⁇ 1.5%
- the chemical composition of the material system has high purity, which is higher than that of the calcium hexaaluminate refractory materials prepared by the current existing technology.
- the phase of the refractory material provided by the application includes one or more of corundum, CA6, CMA and ZrO 2 , based on the percentage of the total mass of the refractory material, the total The phase content is ⁇ 90%; the phase purity is high and the CA6 structure phase is the main one.
- the CA6 structure phase includes the CA6 phase and the CMA phase synthesized based on the CA6 structure. When the CA6 structure phase reacts with the slag Release C12A7 with refining effect, desulfurization, adsorption inclusions, purification of molten steel;
- the volume density of the CA6 series refractories provided by this application is 2.90-3.65g/cm 3 , which is much higher than that of the calcium hexaaluminate series refractories prepared in the prior art; while maintaining the high purity of the material system, the high bulk density
- the material of this application has greatly enhanced mechanical erosion resistance of molten steel and slag, improved slag penetration resistance, greatly improved service life, and reduced inclusions entering molten steel, which is greatly conducive to the cleanliness of molten steel quality ;
- the structure of the refractory material provided by this application is uniform, and there will be no problem of local advanced damage.
- the material is corroded in a balanced and slow manner during use, and there will be no peeling-type layered drop and large The block is damaged, the pollution to the molten steel is small, and the service life will be greatly increased;
- the refractory materials provided by this application are based on high-purity raw materials, with high density, uniform material structure, and few high-oxygen potential components (referring to SiO 2 , TiO 2 , Fe 2 O 3 , R 2 O, etc.), so , the material has excellent slag erosion resistance, permeability resistance and thermal shock stability, which solves the contradiction between the three, gives full play to the performance advantages of high-purity raw materials, greatly improves the service life of the material, and also It has the effect of cleaning molten steel and can be widely used in the metallurgical industry. It can also be widely used in the transition zone of cement rotary kiln and other industrial kiln masonry to increase the operating cycle of equipment, reduce production costs, save energy and reduce emissions;
- the preparation method provided by this application uses simple raw materials and abundant sources. Without using any sintering-promoting components, by means of a hot-press sintering process, the production of calcium hexaaluminate-based high-purity refractory materials can be realized. Good sintering, scientific and reasonable method;
- the calcium hexaaluminate refractory materials provided by this application can be widely used in steelmaking production lines, such as working linings for refining ladles outside furnaces, etc., have good corrosion resistance, can desulfurize and adsorb inclusions, and greatly reduce the cost of high-end special steel
- the damage of refractory materials and the impact on molten steel during the smelting process have improved the overall quality of high-end special steel in my country's metallurgical industry, which can increase the operating cycle of equipment, improve economic benefits, and have significant social benefits;
- the calcium hexaaluminate refractory material of the present application can also be widely used in the refractory lining of the rotary kiln, such as the transition zone of the cement rotary kiln.
- Mo brick, magnesia-aluminum spinel brick and many other refractory materials can increase the operating cycle of equipment, reduce heat loss and improve economic benefits;
- the calcium hexaaluminate refractory material of the present application has very low sensitivity to the atmosphere, and can also be widely used in the masonry of industrial kilns under the conditions of high temperature, reducing atmosphere and alkaline atmosphere erosion, such as petrochemical cracking Furnaces, etc., have good stability, low thermal conductivity, and good corrosion resistance.
- the performance is significantly better than many refractory materials such as corundum bricks, which can increase the operating cycle of equipment, reduce heat loss, and improve economic benefits.
- FIG. 1 is a schematic diagram of molten steel smelting in a crucible prepared in Example 1 of the present application.
- Fig. 2 is a structural diagram of the interface formed between the embodiment of the present application and the molten slag.
- the present application provides a refractory material with the function of cleaning molten steel, and the phase of the refractory material includes one or more than two of CA6, CMA, corundum and ZrO 2 .
- the phase of the refractory material is composed of one or more of CA6, CMA, corundum and ZrO 2 .
- the phase of the refractory material further includes MA.
- CA6 in this application is the abbreviation of calcium hexaaluminate, its structural formula is CaO ⁇ 6Al 2 O, its melting point is 1875°C, and its theoretical density is 3.79g/cm 3 ; the characteristics of this material are: under low oxygen partial pressure It has good stability; it is a lamellar stacked structure, the crystal growth is anisotropic, the growth rate in the C-axis is slow, and it is difficult to sinter; when it reacts with slag, CA2 (short for CaO 2Al 2 O 3 ), CA (short for CaO ⁇ Al 2 O 3 ), etc., at the steelmaking temperature, CA2 is solid and CA is liquid phase, and the solid-liquid mixed phase blocks the pores and inhibits the penetration of slag.
- C2M2A14 in this application is the abbreviation of 2CaO ⁇ 2MgO ⁇ 14Al 2 O 3
- CM2A8 in this application is CaO ⁇ 2MgO ⁇ 8Al 2
- O 3 The abbreviation of O 3
- CMA in this application is the general designation of C2M2A14 and CM2A8. Both C2M2A14 and CM2A8 are based on the C-axis stacking of CA6 structural units and MA, and their properties are similar to CA6.
- phase of matter in this application is a phase with specific physical and chemical properties in a substance.
- the phase of the refractory material is determined by XRD, for example, the measured material is ground to below 325 mesh, and then scanned by an X-ray diffractometer. By analyzing the diffraction data and matching with the standard PDF card, the relevant phase is obtained, and then the content of the relevant phase is obtained by fitting the diffraction data.
- ZrO 2 -CaO solid solution ZrO 2 -MgO solid solution, CaO ⁇ ZrO 2 , MgO ⁇ ZrO 2 , etc. may appear in the final product phase.
- ZrO 2 -CaO solid solution ZrO 2 -MgO solid solution, CaO ⁇ ZrO 2 , MgO ⁇ ZrO 2 and other phases, firstly combine the XRF results to correct the ZrO 2 content, and then convert the ZrO 2 content into zirconia Phase, convert CaO, MgO, etc.
- the refractory material of the present application is based on the percentage of the total mass of the refractory material, and the total phase content of CA6, CMA, corundum and ZrO in the refractory material is ⁇ 90%; for example, it can be 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100%, etc.
- the CA6 phase content is 0-100%
- the CMA phase content is 0-100%
- the ZrO2 phase content is 0-35%, preferably 0-15%;
- the corundum phase content is 0-70%, preferably 0-30%.
- the CA6 phase content can be 0, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70% %, 75%, 80%, 85%, 90%, 95%, 100%, etc.;
- CMA phase content can be 0, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc.;
- ZrO 2 phase content can be 0, 5%, 10%, 15%, 20%, 25%, 30%, 35%, etc.
- Corundum phase content can be 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70% Wait.
- the total phase content of CA6 and CMA in the refractory material is 30% to 100%, for example, it can be 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc., preferably 55% to 100% .
- the phase content of CA6 in the refractory material is 30% to 100%, for example, it can be 30%, 35% , 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc., preferably 55% to 100%.
- the phase content of CA6 in the refractory material is 30%-100%, preferably 55%-100%.
- the preferred order of other phases is ZrO 2 >CMA >corundum, that is, the inclusion of ZrO 2 is better than that of CMA, and the inclusion of CMA is better than that of corundum.
- the CA6 phase content is 0-100%
- the CMA phase content is 0-100%
- the phase content is 0-70%
- the ZrO 2 phase content is 0-35%.
- the CA6 phase content is 0-100%
- the CMA phase content is 0-100%
- the corundum The phase content is 0-30%
- the ZrO2 phase content is 0-15%
- the total phase content of CA6 and CMA is 52.5%-100%.
- the CA6 phase content is 52.5-100%, and the corundum phase content is 0-30%,
- the ZrO 2 phase content is 0-15%.
- the sintering-promoting component is ⁇ 1.5%, preferably 0%.
- the content of the sintering-promoting component in the refractory material can be 1.5%, 1.4%, 1.3%, 1.2%, 1.1%, 1.0%, 0.9%, 0.8% %, 0.7%, 0.6%, 0.5%, 0.4%, 0.3%, 0.2%, 0.1%, 0 or any range therebetween.
- the sintering-promoting components are SiO 2 , TiO 2 , Fe 2 O 3 , and R 2 O. Due to the low content of the sintering-promoting components, the chemical composition of the material system is high, wherein R 2 O refers to alkali metal oxide.
- the refractory material of the present application is based on the percentage of the total mass of the refractory material, and the chemical composition of the refractory material includes:
- Al 2 O 3 55.72% to 97.48% Al 2 O 3 , preferably 72.86% to 94.12% Al 2 O 3 , such as 55.72%, 60%, 65%, 70%, 75%, 80%, 85%, 90% , 95%, 97.48% or any range of Al 2 O 3 therebetween;
- 1.76% to 8.38% CaO preferably 3.20% to 8.40% CaO, such as 1.76%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6% , 6.5%, 7%, 7.5%, 8%, 8.38% or CaO in any range therebetween;
- MgO 0-8.4% of MgO, preferably 0-6.72% of MgO, such as 0%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5% %, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.4%, or any range therebetween of MgO; and
- ZrO 2 0-35% ZrO 2 , preferably 0-15% ZrO 2 , for example, 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35% or any range therebetween ZrO 2 .
- the refractory material of the present application is based on the mass percentage of the refractory material, and the chemical composition of the refractory material includes: 53.20% to 97.13% Al 2 O 3 , 0 to 8.40% % MgO, 1.60%-8.40% CaO, 0-35% ZrO 2 .
- the refractory material of the present application is based on the mass percentage of the refractory material, and the chemical composition of the refractory material includes: 71.06% to 94.10% Al 2 O 3 , 0 to 8.40% MgO, 3.05%-8.40% CaO, 0-15% ZrO 2 .
- the refractory material of the present application is based on the mass percentage of the refractory material, and the chemical composition of the refractory material includes: 75.58% to 94.10% Al 2 O 3 , 4.16 % ⁇ 8.40% CaO, 0 ⁇ 15% ZrO 2 .
- the chemical composition of the refractory material is determined by fluorescence analysis, namely XRF, according to GB/T21114-2007.
- the refractory material of the present application has a bulk density of 2.90 to 3.65g/cm 3 , preferably 2.95g/cm 3 to 3.35g/cm 3 , for example, 2.90g/cm 3 or 2.91g /cm 3 , 2.92g/cm 3 , 2.93g/cm 3 , 2.94g/cm 3 , 2.95g/cm 3 , 2.96g/cm 3 , 2.97g/cm 3 , 2.98g/cm 3 , 2.99g/cm 3 3 , 3.00g/cm 3 , 3.05g/cm 3 , 3.10g/cm 3 , 3.15g/cm 3 , 3.20g/cm 3 , 3.25g/cm 3 , 3.30g/cm 3 , 3.35g/cm 3 , 3.40g/cm 3 , 3.45g/cm 3 , 3.50g/cm 3 , 3.55g/cm 3 ,
- the bulk density of the refractory material is measured according to GB/T2997-2000.
- the phase of the matrix part of the refractory material includes one or more of corundum, CA6, CMA, and ZrO 2 .
- the phase of the matrix part of the refractory material includes corundum, CA6 and CMA.
- the content of the corundum phase is 0-100%, preferably 0-50%;
- the CA6 phase content is 0-100%
- the CMA phase content is 0-100%
- the content of the ZrO 2 phase is 0-50%, preferably 0-25%.
- the corundum phase content in the matrix part can be 0, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc.;
- CA6 phase content can be 0, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc.;
- CMA phase content can be 0, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc.;
- the ZrO 2 phase content can be 0, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, etc.
- the total phase content of CA6 and CMA in the matrix part is 25% to 100%, for example, it can be 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc.
- the phase content of CA6 in the matrix part is 25% to 100%, for example, it can be 25% , 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc.
- multi-phase composite is preferred in the matrix part of the refractory material, for example, the three-phase composite of ZrO 2 , CMA, and corundum is better than the two-phase composite of CMA and corundum.
- the CA6 phase content is 0-100%, and the CMA phase content is 0-100% , the corundum phase content is 0-100%, and the ZrO 2 phase content is 0-50%.
- the content of the CA6 phase is 0-100%, and the content of the CMA phase is 0-100%.
- the corundum phase content is 0-50%, and the ZrO 2 phase content is 0-25%.
- the content of the CA6 phase is 0-100%, and the content of the corundum phase is 0-100%. 50%, and the ZrO 2 phase content is 0-25%.
- the chemical composition of the matrix part of the refractory material includes:
- the content of Al 2 O 3 can be 42.5%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc.;
- the content of CaO can be 0, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5% %, 8%, 8.4%, etc.;
- the content of MgO can be 0, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5% %, 8%, 8.4%, etc.;
- the content of ZrO2 is 0 , 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, etc.
- the chemical composition of the matrix part of the refractory material includes: 41.2% to 99.5% of Al 2 O 3 , 0 to 8.40% MgO, 0-8.40% CaO, 0-50% ZrO 2 .
- the chemical composition of the matrix part of the refractory material includes: 63.15% to 95.80% of Al 2 O 3 , 0 to 8.40 % MgO, 1.35%-8.40% CaO, 0-25% ZrO 2 .
- the chemical composition of the matrix part of the refractory material includes: 67.46% to 95.80% of Al 2 O 3 , 2.0% -8.40 % CaO, 0-25% ZrO2.
- the matrix part of the refractory material refers to the part of the refractory material that does not include particles.
- phase of the matrix part of the refractory material is determined by micro-area diffraction through XRD.
- the operation method of micro-diffraction measurement can be, for example, to select 7 different samples and cut 7 samples out of them.
- the matrix part of each sample was subjected to micro-diffraction, and the full-spectrum fitting was performed on the spectrum to determine the content of each phase.
- the 2 data with large deviations are removed, and then the phase content of the remaining 5 samples is averaged to obtain the phase content of the heat-insulating refractory matrix.
- the selected matrix area should be maximized during sample preparation and scanning.
- the refractory material of the present application is prepared by a method comprising the following steps:
- the granular material and the fine powder are mixed to obtain a mixed material, and the mixed material is subjected to hot pressing and sintering to obtain the refractory material.
- the granular material refers to the part that cannot be sieved through a 180 mesh square hole sieve (such as a square hole sieve produced by Xinxiang Zhongtuo Machinery Equipment Co., Ltd.), that is, the part on the 180 mesh square hole sieve,
- the particle size of the granular material is above 0.088mm.
- the particle size of the granular material can be 0.088mm, 0.090mm, 0.095mm, 0.10mm, 0.15mm, 0.20mm, 0.25mm, 0.30mm, 0.35mm, 0.40mm, 0.45mm mm, 0.50mm, 0.55mm, 0.60mm, 0.65mm, 0.70mm, 0.75mm, 0.80mm, 0.85mm, 0.90mm, 0.95mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 12mm, 14mm, 15mm, 17mm, 19mm, 20mm, 22mm, 24mm, 25mm or any range therebetween, preferably 0.088-10mm.
- the fine powder refers to the part passing through the 180-mesh square-hole sieve, that is, the part under the 180-mesh square-hole sieve, and its particle size is less than 0.088mm.
- the hot press sintering in this application refers to a way to achieve material sintering and preparation under the joint action of applied pressure and temperature.
- the ratio of the total mass of the granular material to the total mass of the fine powder is 30-65:35-70, preferably 40-65:35-60.
- it can be 30:70, 31:69, 32:68, 33:67, 34:66, 35:65, 36:64, 37:63, 38:62, 39:61, 40:60, 41:59 , 42:58, 43:57, 44:56, 45:55, 46:54, 47:53, 48:52, 49:51, 50:50, 51:49, 52:48, 53:47, 54 :46, 55:45, 56:44, 57:43, 58:42, 59:41, 60:40, 61:39, 62:38, 63:37, 64:36, 65:35 or any in between scope.
- the refractory material of the present application the granules are selected from one or two or three of CA6 granules, C2M2A14 granules and CM2A8 granules;
- the fine powder contains 50% to 100% of Al 2 O 3 -CaO-MgO fine powder, preferably 75% to 100% of Al 2 O 3 -CaO-MgO fine powder, for example, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, or any range therebetween of Al 2 O 3 -CaO-MgO fine powder;
- 0-50% ZrO - containing fine powder preferably 0-25% ZrO - containing fine powder, such as 0%, 5%, 10%, 15%, 20%, 25%, 30% , 35%, 40%, 45%, 50% or any range therebetween of fine powder containing ZrO 2 .
- the Al 2 O 3 -CaO-MgO series fine powder is selected from CA6 fine powder, C2M2A14 fine powder, CM2A8 fine powder, fine powder containing Al 2 O 3 , fine powder containing One or both of the mixed powder of Al 2 O 3 fine powder and CaO-containing fine powder, the mixed powder of Al 2 O 3 fine powder, CaO-containing fine powder and MgO-containing fine powder more than one species;
- the fine powder containing Al 2 O 3 is selected from active ⁇ -Al 2 O 3 fine powder, ⁇ -Al 2 O 3 fine powder, ⁇ -Al 2 O 3 fine powder, aluminum hydroxide fine powder, industrial alumina fine powder One or more of white corundum fine powder, sintered corundum fine powder and tabular corundum fine powder;
- the MgO-containing fine powder is selected from magnesium carbonate fine powder, lightly burned magnesium oxide fine powder, brucite fine powder, magnesium hydroxide fine powder, magnesium chloride fine powder, sintered magnesium oxide fine powder and fused magnesium oxide fine powder one or more of
- the fine powder containing CaO is selected from quicklime fine powder, limestone fine powder, calcium hydroxide fine powder, CaO ⁇ Al 2 O 3 fine powder (CA fine powder), CaO 2Al 2 O 3 fine powder (CA2 fine powder) One or more of 12CaO ⁇ 7Al 2 O 3 fine powder (C12A7 fine powder);
- the ZrO2 - containing fine powder is selected from one or more of monoclinic zirconia fine powder, tetragonal zirconia fine powder, desiliconized zirconia fine powder and fused zirconia fine powder.
- fine powder containing Al 2 O 3 in the present application refers to an alumina-based fine powder whose chemical composition is mainly Al 2 O 3 .
- fine powder containing MgO in the present application refers to a fine powder whose chemical composition is mainly MgO.
- fine powder containing CaO in this application refers to the fine powder including CaO component in its chemical composition, or the fine powder including CaO, Al 2 O 3 , or the fine powder including CaO, MgO, Al 2 O 3 pink.
- fine powder containing ZrO2 in the present application refers to a fine powder whose chemical composition is mainly ZrO2 .
- the "active ⁇ -Al 2 O 3 fine powder" in this application is made of industrial alumina or aluminum hydroxide, etc., and is obtained by treating at 1250-1450 ° C. It is mainly ⁇ -Al 2 O 3 and has high activity. alumina powder;
- the " ⁇ -Al 2 O 3 fine powder” in this application is an alumina powder with a relatively high specific surface area and good adsorption properties obtained by treating aluminum hydroxide as a raw material.
- the " ⁇ -Al 2 O 3 fine powder” in this application is an alumina powder with certain hydration binding properties obtained from aluminum hydroxide as raw material through rapid high-temperature treatment at 600-900°C.
- the "industrial alumina fine powder” in this application is a mineral whose main component is ⁇ -Al 2 O 3 , and is a powder prepared by calcining aluminum hydroxide at 900-1250°C.
- the "white corundum fine powder” in this application is an alumina raw material with a content of more than 97.5% of aluminum oxide (Al 2 O 3 ) prepared by electric melting of industrial alumina, and contains a small amount of iron oxide and silicon oxide. and other ingredients, white.
- sintered corundum fine powder in this application refers to a refractory clinker made of alumina as a raw material, which is ground into balls or blanks and sintered at a high temperature of 1750-1900°C. It has excellent thermal shock resistance and slag erosion resistance at low and high temperatures.
- the "tabular corundum granules" of this application have a coarse and well-developed ⁇ -Al 2 O 3 crystal structure, with an Al 2 O 3 content of more than 97.0%, a plate-like crystal structure, small pores and many closed pores .
- the "lightly calcined magnesia fine powder” in this application is a magnesia powder raw material with high activity and periclase phase, which is prepared by calcination at 800-1000°C, with magnesium carbonate as the main component of magnesite .
- the "brucite fine powder” of the present application is a raw material whose main component is Mg(OH ) .
- the "sintered magnesia fine powder” in this application is a dense magnesia raw material with MgO content ⁇ 94.5%, which is obtained by calcining light-burned magnesia as raw material at high temperature.
- the "fused magnesia fine powder" of this application is a dense magnesia raw material with MgO content ⁇ 96.5% prepared by arc melting using light-burned magnesia or magnesite as raw material.
- the "quicklime fine powder” of the present application is mainly composed of calcium oxide, which is usually prepared by calcining natural rocks whose main component is calcium carbonate at high temperature to decompose into carbon dioxide and calcium oxide.
- the "monoclinic zirconia fine powder” in the present application refers to zirconia fine powder whose crystal form is monoclinic.
- tetragonal zirconia fine powder in the present application refers to zirconia fine powder whose crystal form is tetragonal.
- Desiliconized zirconium fine powder in the present application refers to zirconia fine powder obtained after desiliconization of zircon sand.
- the "fused zirconia fine powder” in this application refers to the zirconia raw material prepared by melting method.
- the hot-press sintering is to put the mixture into a mold of a high-temperature device for hot-press sintering, or put the mixture into a mold of a high-temperature device after molding at normal temperature Hot press sintering in the middle or put the mixture into a mold of a high temperature device for hot press sintering after molding at normal temperature and firing at low temperature.
- Putting the mixed material into the mold of the high-temperature device for hot-press sintering means that the mixed material is put into the mold of the high-temperature device to heat up, and when the temperature rises to the highest temperature, pressure is applied to achieve sintering, or continue Heat preservation and pressure for a certain period of time to complete the hot-press sintering of the material; or put the mixture into the mold of the high-temperature device to heat up to a certain temperature and apply pressure, then gradually heat up and increase the applied pressure at the same time until the temperature reaches the highest temperature, the pressure Reach the maximum value, or continue heat preservation and pressure for a certain period of time to complete the hot-press sintering of the material; or put the mixture into the mold of the high-temperature device, and gradually increase the pressure on the mixture while raising the temperature until the temperature reaches the highest temperature , the pressure reaches the maximum value, or the heat preservation and pressure are continued for a certain period of time to complete the hot pressing sintering of the material.
- Putting the mixed material into a mold of a high-temperature device for hot-press sintering after being molded at normal temperature means that the mixed material is pressed at normal temperature into a green body, dried and then put into a mold of a high-temperature device for hot-press sintering; Or apply pressure when the green body is heated to the highest temperature to achieve sintering, or continue heat preservation and pressure for a certain period of time to complete the hot-press sintering of the material; or put the green body into the mold of the high-temperature device and apply pressure when the temperature is raised to a certain temperature , and then gradually raise the temperature and increase the applied pressure at the same time until the temperature reaches the highest temperature and the pressure reaches the maximum value, or continue to hold the heat for a certain period of time to complete the hot-press sintering of the material; or put the green body into the mold of the high-temperature device, Gradually increase the pressure applied to the mixture while raising the temperature until the temperature reaches the highest temperature and the pressure reaches the
- the mixture is molded at normal temperature and sintered at low temperature, and then put into a mold of a high temperature device for hot press sintering, which refers to hot press sintering after the mixture is pressed at normal temperature and pre-sintered at 1350-1500°C.
- the hot pressing sintering operation is the same as above.
- the high temperature device is a kiln integrating high temperature and hot pressing.
- the temperature of the refractory material of the present application is 1550-1800°C, such as 1550°C, 1600°C, 1650°C, 1700°C, 1750°C, 1800°C or any range therebetween.
- the pressure of hot pressing sintering is 0.5-30MPa, for example, it can be 0.5MPa, 1MPa, 1.5MPa, 2MPa, 2.5MPa, 3MPa, 3.5MPa, 4MPa, 4.5MPa, 5MPa, 5.5MPa, 6MPa, 6.5MPa, 7MPa, 7.5MPa , 8MPa, 8.5MPa, 9MPa, 9.5MPa, 10MPa, 10.5MPa, 11MPa, 11.5MPa, 12MPa, 12.5MPa, 13MPa, 13.5MPa, 14MPa, 14.5MPa, 15MPa, 20MPa, 25MPa, 30MPa or any range in between.
- the pressure referred to refers to the hot pressing strength, which is the pressure per unit area applied on the prepared refractory material at high temperature.
- the refractory material of the present application based on the percentage of the total mass of the granular material, the total content of CaO, Al 2 O 3 and MgO in the chemical composition of the granular material is ⁇ 97.5%,
- the bulk density of the granular material is ⁇ 2.90g/cm 3 , such as 2.90g/cm 3 , 2.91g/cm 3 , 2.92g/cm 3 , 2.93g/cm 3 , 2.94g/cm 3 , 2.95g/cm 3 , or 2.95g/cm 3 .
- the fine powder includes: CA6 fine powder, or fine powder containing Al 2 O 3 , or CA6 fine powder and fine powder containing Al 2 O 3 , or fine powder containing Al 2 O In the case of fine powder of 3 and fine powder containing CaO,
- the phase of the refractory material of the present application includes CA6.
- the phase of the refractory material of the present application includes corundum and CA6.
- the fine powder further includes ZrO 2 fine powder
- the phase of the refractory material of the present application further includes ZrO 2 .
- the refractory material of the present application based on the percentage of the total mass of the refractory material,
- the CA6 phase content is 30% to 100%, preferably 55% to 100%, such as 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70% , 75%, 80%, 85%, 90%, 95%, 100%, etc.;
- the corundum phase content is 0-70%, preferably 0-30%, for example, it can be 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% %, 50%, 55%, 60%, 65%, 70%, etc.;
- the ZrO2 phase content is 0-35%, preferably 0-15%, for example, it can be 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 27%, 30%, 32%, 35%, etc.
- the refractory material of the present application is based on the percentage of the total mass of the refractory material, and the chemical composition of the refractory material includes:
- 0-35% ZrO 2 preferably 0-15% ZrO 2 , such as 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22% , 25%, 27%, 30%, 32%, 35%, etc.
- the phase of the matrix part of the refractory material includes one or both of corundum and CA6.
- the phase of the matrix part of the refractory material includes: one or both of corundum and CA6, and ZrO 2 .
- the refractory material of the present application is based on the percentage of the total mass of the matrix part of the refractory material, and in the matrix part,
- the corundum phase content is 0-100%, preferably 0-50%, for example, it can be 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22% %, 25%, 27%, 30%, 32%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc.;
- the content of the CA6 phase is 0-100%, preferably 25%-100%, such as 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 27%, 30%, 32%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90% , 95%, 100%, etc.;
- the ZrO2 phase content is 0-50%, preferably 0-25%, such as 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 27%, 30%, 32%, 35%, 40%, 45%, 50%, etc.
- the chemical composition of the matrix part of the refractory material of the present application includes:
- Al 2 O 3 45.8% to 100% Al 2 O 3 , preferably 68.7% to 95.8% Al 2 O 3 , such as 45.8%, 50%, 55%, 60%, 65%, 70%, 75%, 80% , 85%, 90%, 95%, 100%, etc.;
- 0-8.4% of CaO preferably 2.1%-8.4% of CaO, such as 0%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.4%, etc.; and
- ZrO 2 0-50% ZrO 2 , preferably 0-25% ZrO 2 , such as 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22% , 25%, 27%, 30%, 32%, 35%, 40%, 45%, 50%, etc.
- the fine powder includes: one or both of CA6 fine powder, CMA fine powder and fine powder containing Al 2 O 3 or In three cases,
- the phase of the refractory material of the present application includes CMA.
- the phase of the refractory material of the present application includes one or both of corundum and CA6, and CMA.
- the fine powder further includes ZrO 2 fine powder
- the phase of the refractory material of the present application further includes ZrO 2 .
- the refractory material of the present application based on the percentage of the total mass of the refractory material,
- the CMA phase content is 30% to 100%, preferably 55% to 100%, such as 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75% %, 80%, 85%, 90%, 95%, 100%, etc.;
- CM2A8 When CM2A8 is used as aggregate and fine powder, its content is preferably 0-80%.
- the content of the CA6 phase is 0-70%, preferably 0-60%, for example, it can be 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% %, 50%, 55%, 60%, 65%, 70%, etc.;
- the corundum phase content is 0-70%, preferably 0-30%, for example, it can be 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% %, 50%, 55%, 60%, 65%, 70%, etc.;
- the ZrO2 phase content is 0-35%, preferably 0-15%, for example, it can be 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 27%, 30%, 32%, 35%, etc.
- the refractory material of the present application is based on the percentage of the total mass of the refractory material, and the chemical composition of the refractory material includes:
- 1.76% to 7.95% CaO preferably 3.23% to 7.80% CaO, such as 1.76%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6% , 6.5%, 7%, 7.5%, 7.95%, etc.;
- MgO 1.48% to 8.4% MgO, preferably 1.98% to 6.72% MgO, such as 1.48%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6% , 6.5%, 7%, 7.5%, 8%, 8.4%, etc.;
- 0-35% ZrO 2 preferably 0-15% ZrO 2 , such as 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22% , 25%, 27%, 30%, 32%, 35%, etc.
- the phase of the matrix part of the refractory material includes one or two or three of corundum, CA6 and CMA.
- the phase of the matrix part of the refractory material includes: one or two or three of corundum, CA6 and CMA, and ZrO 2 .
- the refractory material of the present application is based on the percentage of the total mass of the matrix part of the refractory material, and in the matrix part,
- the corundum phase content is 0-100%, preferably 0-50%, for example, it can be 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22% %, 25%, 27%, 30%, 32%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc.;
- the content of the CA6 phase is 0-100%, preferably 25%-100%, such as 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 27%, 30%, 32%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90% , 95%, 100%, etc.;
- the CMA phase content is 0-100%, preferably 25%-100%, such as 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 27%, 30%, 32%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90% , 95%, 100%, etc.;
- the ZrO2 phase content is 0-50%, preferably 0-25%, such as 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 27%, 30%, 32%, 35%, 40%, 45%, 50%, etc.
- the chemical composition of the matrix portion of the refractory material of the present application includes:
- Al 2 O 3 preferably 64.29%-95.8% Al 2 O 3 , such as 42.86%, 45%, 50%, 55%, 60%, 65%, 70%, 75% , 80%, 85%, 90%, 95%, 100%, etc.;
- CaO 0-8.4% CaO, preferably 1.47%-8.4% CaO, such as 0%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.4%, etc.;
- MgO 0-8.4% of MgO, preferably 0-8.4% of MgO, such as 0%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5% %, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.4%, etc.;
- ZrO 2 0-50% ZrO 2 , preferably 0-25% ZrO 2 , such as 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22% , 25%, 27%, 30%, 32%, 35%, 40%, 45%, 50%, etc.
- the present application also provides a kind of preparation method of refractory material, it comprises the steps:
- the granular material and the fine powder are mixed to obtain a mixed material, and the mixed material is subjected to hot pressing and sintering to obtain the refractory material.
- the mass ratio of the granular material to the fine powder is 30-65:35-70, preferably 40-65:35-60.
- the particle size of the fine powder is less than 0.088 mm, and the particle size of the granular material is greater than 0.088 mm, preferably 0.088-10 mm.
- the hot-press sintering is to put the mixture into a mold of a high-temperature device for hot-press sintering or put the mixture into a mold of a high-temperature device after molding at normal temperature Hot press sintering in the middle or put the mixture into a mold of a high temperature device for hot press sintering after molding at normal temperature and firing at low temperature.
- the application uses high temperature and high pressure to promote particle rearrangement and particle diffusion, and the refractory material obtained has less high-temperature liquid phase, uniform structure, and good thermal shock stability.
- the present application provides a working lining of a ladle for molten steel smelting, which includes the above-mentioned refractory material or the above-mentioned refractory material prepared by the above-mentioned preparation method.
- the application provides a working lining for molten aluminum smelting and transporting ladles, which includes the above-mentioned refractory material or the refractory material prepared by the above-mentioned preparation method.
- the present application provides a refractory lining for an industrial kiln, which includes the above-mentioned refractory material or the refractory material prepared by the above-mentioned preparation method.
- This application is based on the CA6 raw material with high purity, low oxygen potential, high corrosion resistance and potential purification function of molten steel.
- the refractory material with the function of cleaning molten steel can give full play to the advantages of the corrosion resistance of high-purity raw materials and the function of purifying molten steel; the construction of a refractory material with a uniform structure not only solves the structural stress of the refractory material as a whole, but also solves the problem of The problem of anti-slag penetration and rapid corrosion has realized the coordination and unity of anti-penetration and thermal shock resistance; this not only gives full play to the advantages of high-purity raw materials with good corrosion resistance and the function of CA6 material to purify molten steel, but also takes into account It solves the contradiction between thermal shock stability and slag penetration resistance, and also solves the problem of too fast damage to the refractory lining of the ladle under harsh refining conditions, and reduces the problem of introducing refractory inclusions into the steel. Economic benefits
- % means wt%, ie weight percentage.
- the reagents or instruments used, whose manufacturers are not indicated, are commercially available conventional reagent products, wherein, Table 1 shows the raw materials and sources used in the examples.
- the phases of the refractory materials in each example were analyzed by using the XRD method, that is, the measured materials were ground to below 325 mesh, and then scanned by an X-ray diffractometer (Bruker: D8ADVANCE). By analyzing the diffraction data and matching with the standard PDF card, the relevant phase is obtained, and then the content of the relevant phase is obtained by fitting the diffraction data.
- the chemical composition of the refractory materials in each embodiment was determined according to GB/T21114-2007 by XRF method.
- the phase of the matrix part in the refractory material is analyzed by XRD for micro-diffraction. That is, 12 different refractory materials are selected, and 12 samples are cut out from them. In each sample, the matrix area with relatively uniform color and structure was selected for micro-area diffraction, and the diffraction pattern was fitted with a full spectrum to determine the content of each phase. Remove the larger 2 data of deviation, then the phase content of the remaining 10 samples is averaged to be the phase content of the refractory matrix.
- the obtained refractory material is analyzed by XRD.
- the phase content of CA6 in the refractory material is 100%.
- the obtained refractory material was analyzed by XRF, and the refractory material contained 91.05% Al 2 O 3 and 8.40% CaO in terms of the total mass percentage of the refractory material.
- phase analysis of the matrix part in the refractory material uses XRD for micro-area diffraction measurement, and the phase of the matrix part of the refractory material includes 100% CA6.
- the chemical composition of the matrix part in the refractory material includes 91.0% Al 2 O 3 , 8.40% CaO;
- the obtained refractory material was analyzed by drainage method, and the bulk density of the refractory material was found to be 3.20 g/cm 3 .
- the obtained refractory material is analyzed by XRD, and the phases obtained are mainly CA6, corundum and zirconia.
- the CA6 phase is 55%
- the corundum phase is 55%
- the phase content is 28.5%
- the zirconia phase content is 15%.
- the obtained refractory material was analyzed by XRF, and the refractory material contained 79.3% Al 2 O 3 , 4.4% CaO, and 15% ZrO 2 in terms of the total mass percentage of the refractory material.
- phase analysis of the matrix part in the refractory material is determined by micro-area diffraction by XRD, and the phase of the matrix part of the refractory material mainly includes 24.0% CA6, 47.5% corundum and 25% zirconia.
- the chemical composition of the matrix part in the refractory material includes 71.7% Al 2 O 3 , 1.98% CaO, and 25% ZrO 2 ;
- the bulk density of the obtained refractory material was measured to be 3.25 g/cm 3 .
- the obtained refractory material is analyzed by XRD, and the obtained phase is mainly CA6 and corundum.
- the CA6 phase content is 68.6% and the corundum phase content is 30%.
- the obtained refractory material was analyzed by XRF, and the refractory material contained 94.12% Al 2 O 3 and 5.0% CaO in terms of the total mass percentage of the refractory material.
- phase analysis of the matrix part in the refractory material is determined by micro-area diffraction by XRD, and the phase of the matrix part of the refractory material mainly includes 48.5% CA6 and 50% corundum.
- the chemical composition of the matrix part in the refractory material includes 95.8% Al 2 O 3 , 4.05% CaO;
- the bulk density of the obtained refractory material was measured to be 2.95 g/cm 3 .
- the obtained refractory material is analyzed by XRD, and the obtained phase is mainly corundum and CM2A8.
- the CA6 phase is 9.71%
- the C2M2A14 is 28.4%
- CM2A8 is 49.9%
- the zirconia phase is 9.46%.
- the obtained refractory material is analyzed by XRF, and the refractory material includes 77.5% of Al 2 O 3 , 5.43% of MgO, 5.68% of CaO, and 9.45% of ZrO in terms of the percentage of the total mass of the refractory material 2 .
- phase analysis of the matrix part in the refractory material is determined by micro-area diffraction by XRD, and the phase of the matrix part of the refractory material mainly includes CM2A8 phase content of 80% and zirconia phase content of 18.7%.
- the chemical composition of the matrix part in the refractory material includes 67.9% Al 2 O 3 , 6.72% MgO, 4.05% CaO, and 18.9% ZrO 2 ;
- the bulk density of the obtained refractory material was measured to be 3.20 g/cm 3 .
- the obtained refractory material is analyzed by XRD, and the obtained phase is mainly corundum and CM2A8.
- the content of the corundum phase is 9.48%
- the content of the CM2A8 phase is 9.48%. It is 80.0%, 9.72% zirconia.
- the obtained refractory material is analyzed by XRF, and the refractory material includes 78.0% of Al 2 O 3 , 6.72% of MgO, 4.3% of CaO, and 9.6% of ZrO in terms of the percentage of the total mass of the refractory material 2 .
- phase analysis of the matrix part in the refractory material is determined by XRD micro-diffraction, and the phase of the matrix part of the refractory material mainly includes 50% CM2A8, 25% corundum, and 25% zirconia.
- the chemical composition of the matrix part in the refractory material includes 66.3% Al 2 O 3 , 4.20% MgO, 2.84% CaO, and 25% ZrO 2 ;
- the bulk density of the obtained refractory material was measured to be 3.10 g/cm 3 .
- the obtained refractory material is analyzed by XRD, and the phases obtained are mainly CM2A8 and zirconia.
- the content of CM2A8 phase is 83.8%, zirconia
- the phase content is 15%;
- the obtained refractory material is analyzed by XRF, and the refractory material includes 72.86% of Al 2 O 3 , 6.89% of MgO, 4.63% of CaO, and 15% of ZrO in terms of the percentage of the total mass of the refractory material. 2 .
- phase analysis of the matrix part in the refractory material is carried out by XRD for micro-area diffraction measurement, and the phase of the matrix part of the refractory material mainly includes 73.89% of the CM2A8 phase and 25% of the zirconia phase;
- the chemical composition of the matrix part in the refractory material includes 64.29% Al 2 O 3 , 6.0% MgO, 4.05% CaO, and 25% ZrO 2 ;
- the bulk density of the obtained refractory material was measured to be 3.15 g/cm 3 .
- the obtained refractory material is analyzed by XRD, and the obtained phase is mainly corundum and CM2A8. Based on the percentage of the total mass of the refractory material, in the refractory material, the content of the CM2A8 phase is 55%, and the content of the corundum phase is 55%. is 30%, and the zirconia phase content is 14.3%;
- the obtained refractory material is analyzed by XRF, and the refractory material includes 76.1% of Al 2 O 3 , 4.52% of MgO, 3.2% of CaO, and 14.5% of ZrO in terms of the percentage of the total mass of the refractory material 2 .
- phase analysis of the matrix part in the refractory material adopts XRD for micro-area diffraction measurement, and the phase of the matrix part of the refractory material mainly includes a corundum phase content of 50%, a CM2A8 phase of 25%, and a zirconia phase. was 23.8%.
- the chemical composition of the matrix part in the refractory material includes 70.2% Al 2 O 3 , 1.98% MgO, 1.47% CaO, and 24.2% ZrO 2 ;
- the bulk density of the obtained refractory material was measured to be 3.28 g/cm 3 .
- the maximum temperature is 1550°C and apply pressure at this temperature
- the hot-press strength is 30MPa
- the calcium hexaaluminate-based refractory with clean molten steel function is obtained Material.
- the obtained refractory material was analyzed by XRD, and the obtained phases were mainly corundum and CM2A8. Based on the percentage of the total mass of the refractory material, the content of CM2A8 phase in the refractory material was 63.7%, and the phase content of zirconia was 63.7%. The content is 35%;
- the obtained refractory material is analyzed by XRF, and the refractory material includes 55.72% of Al 2 O 3 , 5.28% of MgO, 3.63% of CaO, and 35% of ZrO in terms of the percentage of the total mass of the refractory material 2 .
- phase analysis of the matrix part in the refractory material is determined by micro-area diffraction by XRD, and the phase of the matrix part of the refractory material mainly includes CM2A8 phase content of 48.6% and zirconia phase content of 50%.
- the chemical composition of the matrix part in the refractory material includes 41.5% Al 2 O 3 , 3.98% MgO, 2.75% CaO, and 50% ZrO 2 ;
- the measured bulk density of the obtained refractory material was 3.65 g/cm 3 .
- the obtained refractory material is analyzed by XRD, and the main phase is C2M2A14, and the content of the C2M2A14 phase in the refractory material is 100% based on the percentage of the total mass of the refractory material.
- the obtained refractory material was analyzed by XRF, and the refractory material contained 87.7% Al 2 O 3 , 4.02% MgO, and 6.29% CaO in terms of the total mass percentage of the refractory material.
- phase analysis of the matrix part in the refractory material adopts XRD for micro-diffraction measurement, and the phase of the matrix part of the refractory material mainly includes C2M2A14 phase content of 100%;
- the chemical composition of the matrix part in the refractory material includes 87.65% Al 2 O 3 , 4.13% MgO, and 6.37% CaO;
- the obtained refractory material was analyzed by drainage method, and the bulk density of the refractory material was found to be 3.55 g/cm 3 .
- the obtained refractory material is analyzed by XRD, and the main phase is CM2A8, and the content of the CM2A8 phase in the refractory material is 100% based on the percentage of the total mass of the refractory material.
- the obtained refractory material was analyzed by XRF, and the refractory material contained 85.24% Al 2 O 3 , 8.40% MgO, and 5.58% CaO in terms of the total mass percentage of the refractory material.
- phase analysis of the matrix part in the refractory material is determined by micro-area diffraction by XRD, and the CM2A8 phase content of the matrix part of the refractory material is 100%.
- the chemical composition of the matrix part in the refractory material includes 85.12% Al 2 O 3 , 8.40% MgO, and 5.67% CaO;
- the obtained refractory material was analyzed by drainage method, and the bulk density of the refractory material was found to be 3.41 g/cm 3 .
- the maximum temperature is 1780°C and apply pressure at this temperature
- the hot-press strength is 0.5MPa
- the calcium hexaaluminate base with clean molten steel function is obtained refractory material.
- the obtained refractory material is analyzed by XRD, and the obtained phase is mainly corundum and CA6.
- the corundum phase content is 70%
- the CA6 phase content is 70%. was 28.2%.
- the obtained refractory material was analyzed by XRF, and the refractory material contained 97.48% Al 2 O 3 and 2.38% CaO in terms of the total mass percentage of the refractory material.
- phase analysis of the matrix part in the refractory material is determined by micro-diffraction by XRD, and the content of the corundum phase in the matrix part of the refractory material is 100%;
- the chemical composition of the matrix part in the refractory material is 100% Al 2 O 3 ;
- the bulk density of the obtained refractory material was measured to be 3.0 g/cm 3 .
- the maximum temperature is 1600°C and apply pressure at this temperature
- the hot-press strength is 20MPa
- the calcium hexaaluminate-based refractory with clean molten steel function is obtained Material.
- the obtained refractory material is analyzed by XRD, and the obtained phase is mainly corundum and CM2A8.
- the corundum phase content is 68.35%
- the CM2A8 phase content is 68.35%. was 28.9%.
- the obtained refractory material was analyzed by XRF, and the refractory material contained 94.67% Al 2 O 3 , 2.41% MgO, and 1.76% CaO in terms of the total mass percentage of the refractory material.
- phase analysis of the matrix part in the refractory material is determined by micro-area diffraction by XRD, and the content of the corundum phase in the matrix part of the refractory material is 97.64%.
- the chemical composition of the matrix part in the refractory material includes 98.85% Al 2 O 3 ;
- the bulk density of the obtained refractory material was measured to be 2.90 g/cm 3 .
- CM2A8 fine powder 500g CM2A8 fine powder, 264g aluminum hydroxide fine powder, 16.5g calcium hydroxide fine powder, 25g magnesium hydroxide fine powder and 300gCM2A8 granular material are mixed and stirred evenly to obtain a mixture, wherein the largest particle size The particle size is 8mm, and the bulk density is 2.95g/cm 3 ;
- the obtained refractory material is analyzed by XRD, and the obtained phases are mainly CM2A8 and CA6.
- the content of the CM2A8 phase is 80%
- the content of the CA6 phase is 80%
- the content of the corundum phase is 3.7%
- the content of the corundum phase is 6.3%
- the sum of these three phases is 90%
- the remaining phases are CA2 and MA, of which the content of the CA2 phase is 3.85%, and the content of the MA phase is 5.78%.
- the obtained refractory material was analyzed by XRF, and the refractory material contained 85.32% Al 2 O 3 , 8.38% MgO, and 5.53% CaO in terms of the total mass percentage of the refractory material.
- the phase analysis of the matrix part in the refractory material uses XRD to carry out micro-area diffraction measurement, and the content of the CM2A8 phase of the matrix part of the refractory material is 71.4%, the content of the CA6 phase is 5.28%, and the content of the corundum phase is 5.28%. 9.0%, the CA2 phase content is 5.5%, and the MA phase content is 8.26%.
- the chemical composition of the matrix part in the refractory material includes 85.15% Al 2 O 3 , 8.37% MgO, and 5.71% CaO;
- the obtained refractory material was analyzed by drainage method, and the bulk density of the refractory material was found to be 2.92 g/cm 3 .
- the obtained refractory material is analyzed by XRD, and the phases obtained are mainly CA6 and zirconia.
- the CA6 phase is 81.2%
- the zirconia material is 81.2%. Phase is 15%.
- the obtained refractory material was analyzed by XRF, and the refractory material contained 75.58% Al 2 O 3 , 6.75% CaO, and 15% ZrO 2 in terms of the total mass percentage of the refractory material.
- phase analysis of the matrix part in the refractory material is determined by micro-area diffraction by XRD, and the phases of the matrix part of the refractory material mainly include CA6 phase content of 73.1% and zirconia phase content of 25%.
- the chemical composition of the matrix part in the refractory material includes 67.46% Al 2 O 3 , 6.02% CaO, and 25% ZrO 2 ;
- the bulk density of the obtained refractory material was measured to be 3.20 g/cm 3 .
- the obtained refractory material is analyzed by XRD, and the obtained phases are mainly CA6, corundum and zirconia.
- the CA6 phase is 52.5%
- the corundum phase is 52.5%
- the phase content is 29.3%
- the zirconia phase content is 14.8%.
- the obtained refractory material was analyzed by XRF, and the refractory material contained 79.12% Al 2 O 3 , 4.16% CaO, and 14.2% ZrO 2 in terms of the total mass percentage of the refractory material.
- phase analysis of the matrix part in the refractory material is determined by micro-area diffraction by XRD, and the phase of the matrix part of the refractory material mainly includes 22.5% CA6, 48.9% corundum and 24.67% zirconia.
- the chemical composition of the matrix part in the refractory material includes 71.08% Al 2 O 3 , 2.0% CaO, and 23.71% ZrO 2 ;
- the bulk density of the obtained refractory material was measured to be 3.20 g/cm 3 .
- the obtained refractory material is analyzed by XRD, and the obtained phase is mainly CA6 and corundum.
- the CA6 phase content is 68.28% and the corundum phase content is 30%.
- the obtained refractory material was analyzed by XRF, and the refractory material contained 94.10% Al 2 O 3 and 5.62% CaO in terms of the total mass percentage of the refractory material.
- phase analysis of the matrix part in the refractory material is determined by micro-diffraction using XRD, and the phase of the matrix part of the refractory material mainly includes 47.6% CA6 and 50% corundum.
- the chemical composition of the matrix part in the refractory material includes 95.8% Al 2 O 3 , 4.12% CaO;
- the bulk density of the obtained refractory material was measured to be 3.20 g/cm 3 .
- the obtained refractory material is analyzed by XRD, and the phases obtained are mainly CM2A8 and zirconia.
- the content of CM2A8 phase is 82.5%, zirconia The phase content is 15%;
- the obtained refractory material is analyzed by XRF, and the refractory material includes 71.06% of Al 2 O 3 , 6.54% of MgO, 4.63% of CaO, and 15% of ZrO in terms of the percentage of the total mass of the refractory material 2 .
- phase analysis of the matrix part in the refractory material is carried out by XRD for micro-area diffraction measurement, and the phase of the matrix part of the refractory material mainly includes 73.89% of the CM2A8 phase and 25% of the zirconia phase;
- the chemical composition of the matrix part in the refractory material includes 63.15% of Al 2 O 3 , 6.13% of MgO, 4.25% of CaO, and 25% of ZrO 2 ;
- the bulk density of the obtained refractory material was measured to be 3.20 g/cm 3 .
- the maximum temperature is 1700°C and apply pressure at this temperature
- the hot-press strength is 7MPa
- the calcium hexaaluminate-based refractory with clean molten steel function is obtained Material.
- the obtained refractory material is analyzed by XRD, and the obtained phases are mainly corundum, CM2A8 and zirconia.
- the content of CM2A8 phase is 52.5%
- the phase content is 30%
- the phase content of zirconia is 14.43%;
- the obtained refractory material is analyzed by XRF, and the refractory material includes 75.23% of Al 2 O 3 , 4.18% of MgO, 3.05% of CaO, and 14.48% of ZrO in terms of the percentage of the total mass of the refractory material 2 .
- phase analysis of the matrix part in the refractory material adopts XRD for micro-area diffraction measurement, and the phase of the matrix part of the refractory material mainly includes a corundum phase content of 50%, a CM2A8 phase of 23.5%, and a zirconia phase. was 24.5%.
- the chemical composition of the matrix part in the refractory material includes 69.6% of Al 2 O 3 , 2.0% of MgO, 1.35% of CaO, and 24.2% of ZrO 2 ;
- the bulk density of the obtained refractory material was measured to be 3.20 g/cm 3 .
- the maximum temperature is 1700°C and apply pressure at this temperature
- the hot-press strength is 4MPa
- the calcium hexaaluminate-based refractory with clean molten steel function is obtained Material.
- the obtained refractory material is analyzed by XRD, and the obtained phase is mainly corundum and CM2A8.
- the content of CM2A8 phase in the refractory material is 62.5%, and the phase content of zirconia is 62.5%.
- the content is 35%;
- the obtained refractory material is analyzed by XRF, and the refractory material includes 53.20% of Al 2 O 3 , 5.09% of MgO, 3.49% of CaO, and 35% of ZrO in terms of the percentage of the total mass of the refractory material 2 .
- phase analysis of the matrix part in the refractory material is determined by micro-area diffraction by XRD, and the phases of the matrix part of the refractory material mainly include CM2A8 phase content of 48.7% and zirconia phase content of 50%.
- the chemical composition of the matrix part in the refractory material includes 41.2% Al 2 O 3 , 4.02% MgO, 2.71% CaO, and 50% ZrO 2 ;
- the bulk density of the obtained refractory material was measured to be 3.20 g/cm 3 .
- the obtained refractory material is analyzed by XRD, and the obtained phase is mainly corundum and CA6.
- the corundum phase content is 70%
- the CA6 phase content is 70%. was 29.4%.
- the obtained refractory material was analyzed by XRF, and the refractory material contained 97.13% Al 2 O 3 and 2.38% CaO in terms of the total mass percentage of the refractory material.
- phase analysis of the matrix part in the refractory material is determined by micro-diffraction by XRD, and the content of the corundum phase in the matrix part of the refractory material is 100%;
- the chemical composition of the matrix part in the refractory material is 99.5% Al 2 O 3 ;
- the bulk density of the obtained refractory material was measured to be 3.20 g/cm 3 .
- the obtained refractory material is analyzed by XRD, and the obtained phase is mainly corundum and CM2A8.
- the content of the corundum phase is 70%
- the content of the CM2A8 phase is 70%. was 28.1%.
- the obtained refractory material was analyzed by XRF, and the refractory material contained 94.67% Al 2 O 3 , 2.36% MgO, and 1.60% CaO in terms of the total mass percentage of the refractory material.
- phase analysis of the matrix part in the refractory material is determined by micro-area diffraction by XRD, and the content of the corundum phase in the matrix part of the refractory material is 100%.
- the chemical composition of the matrix part in the refractory material includes 99.5% Al 2 O 3 ;
- the bulk density of the obtained refractory material was measured to be 3.35 g/cm 3 .
- the refractory material of embodiment 1 is prepared as sample, and drill in the middle of the sample Pit to form a crucible for molten steel smelting experiments.
- the deoxidation method adopts metal aluminum deoxidation, the experimental temperature is 1600 °C, the argon atmosphere, and the slag system adopts the CaO-Al 2 O 3 -SiO 2 system.
- Fig. 1 is a schematic diagram of molten steel smelting based on the sample of Example 1.
- Figure 2 is a microstructure diagram at the interface between the refractory material and steel slag. It was confirmed by electron microscopy and XRD analysis that a metamorphic layer that inhibits slag penetration and improves the size and performance of inclusions is formed at the interface. The phases of this layer are mainly C12A7, CA2 and CA. In addition, it can be seen that the reaction interface and transition layer of the material are very thin and uniform in structure, which fully demonstrates that the material has excellent resistance to slag penetration and slag erosion.
- Table 3 shows the statistics of inclusions in the steel after smelting aluminum-killed steel using the crucible prepared in Example 1 over time. It can be seen from Table 3 that with the prolongation of time, the size distribution of inclusions in steel gradually decreases, and the large-scale inclusions with large hazards are significantly reduced, and the effect is very obvious. It can also be shown that the cleaning effect of the refractory material in Example 1 on the inclusions in steel is still very obvious.
- Table 4 shows the statistics of inclusions in steel after smelting aluminum-killed steel, the total depth of slag erosion and penetration, and the thermal shock stability of refractory materials made in different embodiments and comparative examples. times.
- the number of thermal shock stability is determined according to GB/T 30873-2014.
- Comparative example 1 based on the currently most commonly used ladle lining material—corundum-spinel castable, the average size of the inclusions is 2.48 ⁇ m, and the area ratio is 7.52%; based on the embodiment in comparative example 2 (CN107500747A) 1
- the average size of the inclusions in the steel is 2.45 ⁇ m, and the area ratio is 6.35%.
- the average size of the inclusions in the steel is 1.47 ⁇ m, and the area ratio is 5.89%.
- the size of the inclusions is significantly improved, especially the number of large-sized inclusions.
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Abstract
Description
Claims (26)
- 一种具有洁净钢水功能的耐火材料,其特征在于,所述耐火材料的物相包括CA6、CMA、刚玉和ZrO 2中的一种或两种以上。
- 根据权利要求1所述的耐火材料,其特征在于,以所述耐火材料总质量的百分含量计,所述耐火材料中CA6、CMA、刚玉和ZrO 2的总物相含量≥90%;其中,所述CA6物相含量为0~100%;所述CMA物相含量为0~100%;所述ZrO 2物相含量为0~35%,优选为0~15%;所述刚玉物相含量为0~70%,优选为0~30%;优选地,以所述耐火材料总质量的百分含量计,所述耐火材料中,所述CA6与CMA的总物相含量为30%~100%,优选为55%~100%或52.5~100%;更优选地,以所述耐火材料总质量的百分含量计,所述耐火材料中,所述CA6的物相含量为30%~100%,优选为52.5%~100%或55%~100%。
- 根据权利要求1或2所述的耐火材料,其特征在于,以所述耐火材料总质量的百分含量计,所述耐火材料中的促烧结组分含量≤1.5%,优选为0。
- 根据权利要求1~3中任一项所述的耐火材料,其特征在于,以所述耐火材料总质量的百分含量计,所述耐火材料的化学成分包括:53.20%~97.13%或55.72%~97.48%的Al 2O 3,优选为71.06%~94.10%或72.86%~94.12%的Al 2O 3;更优选为75.58%~94.10%的Al 2O 3。1.60%~8.40%或1.76%~8.4%的CaO,优选为3.05%~8.40%或3.2%~8.4%的CaO,更优选为4.16%~8.40%的CaO;0~8.4%的MgO,优选为0~6.72%的MgO;以及0~35%的ZrO 2,优选为0~15%的ZrO 2。
- 根据权利要求1~4中任一项所述的耐火材料,其特征在于,所述耐火材料的体积密度为2.90~3.65g/cm 3,优选为2.95~3.35g/cm 3。
- 根据权利要求1~5中任一项所述的耐火材料,其特征在于,所述耐火材料的基质部分的物相包括刚玉、CA6、CMA和ZrO 2中的一种或两种以上;以所述耐火材料的基质部分总质量的百分含量计,所述基质部分中,所述刚玉物相含量为0~100%,优选为0~50%;所述CA6物相含量为0~100%;所述CMA物相含量为0~100%;所述ZrO 2物相含量为0~50%,优选为0~25%;优选地,以所述耐火材料的基质部分总质量的百分含量计,所述基质部分中,所述CA6与CMA的总物相含量为25%~100%;更优选地,以所述耐火材料的基质部分总质量的百分含量计,所述基质部分中,所述CA6的物相含量为25%~100%。
- 根据权利要求1~6中任一项所述的耐火材料,其特征在于,以所述耐火材料的基质部分总质量的百分含量计,所述耐火材料的基质部分的化学成分包括:41.2%~99.5%或42.5%~100%的Al 2O 3,优选为63.15%~95.80%或64.29%~95.8%的Al 2O 3;更优选为67.46%~95.80%的Al 2O 3。0~8.4%的CaO,优选为1.35%~8.40%或1.47%~8.4%的CaO,更优选为2.0%~8.40%的CaO;0~8.4%的MgO,优选为0~6.72%的MgO;以及0~50%的ZrO 2,优选为0~25%的ZrO 2。
- 根据权利要求1~7中任一项所述的耐火材料,其特征在于,其通过包含下述步骤的方法制备得到:将颗粒料和细粉混合得到混合料,将所述混合料进行热压烧结得到所述耐火材料。
- 根据权利要求8所述的耐火材料,其特征在于,所述颗粒料与所述细粉的质量比为30~65:35~70;优选为40~65:35~60。
- 根据权利要求8或9所述的耐火材料,其特征在于,所述颗粒料选自CA6颗粒料、CMA颗粒料中的一种或两种。
- 根据权利要求8~10中任一项所述的耐火材料,其特征在于,所述细粉包括Al 2O 3-CaO-MgO系细粉;优选地,所述细粉还包括含ZrO 2的细粉;优选地,以所述细粉总质量的百分含量计,所述细粉包含50%~100%的Al 2O 3-CaO-MgO系细粉和0~50%的含ZrO 2的细粉;优选所述细粉包含 75%~100%的Al 2O 3-CaO-MgO系细粉和0~25%的含ZrO 2的细粉;优选地,所述Al 2O 3-CaO-MgO系细粉选自CA6细粉、CMA细粉、含Al 2O 3的细粉、含Al 2O 3的细粉与含CaO的细粉两者的混合粉、含Al 2O 3的细粉与含CaO的细粉及含MgO的细粉三者的混合粉中的一种或两种以上;优选地,所述含Al 2O 3的细粉选自活性α-Al 2O 3细粉、γ-Al 2O 3细粉、ρ-Al 2O 3细粉、氢氧化铝细粉、工业氧化铝细粉、白刚玉细粉、烧结刚玉细粉和板状刚玉细粉中的一种或两种以上;优选地,所述含MgO的细粉选自碳酸镁细粉、轻烧氧化镁细粉、水镁石细粉、氢氧化镁细粉、氯化镁细粉、烧结氧化镁细粉和电熔氧化镁细粉中的一种或两种以上;优选地,所述含CaO的细粉选自生石灰细粉、石灰石细粉、氢氧化钙细粉、CaO·Al 2O 3细粉、CaO·2Al 2O 3细粉、12CaO·7Al 2O 3细粉中的一种或两种以上;优选地,所述含ZrO 2的细粉选自单斜氧化锆细粉、四方氧化锆细粉、脱硅锆细粉和电熔氧化锆细粉中的一种或两种以上。
- 根据权利要求8~11中任一项所述的耐火材料,其特征在于,所述细粉的粒径小于0.088mm,所述颗粒料的粒径为0.088~10mm。
- 根据权利要求8~12中任一项所述的耐火材料,其特征在于,所述热压烧结为将混合料放入高温装置的模具中进行热压烧结;或者,将所述混合料经常温成型后再放入高温装置的模具中进行热压烧结;或者,将所述混合料经常温成型和低温烧结后再放入高温装置的模具中进行热压烧结。
- 根据权利要求8~13所述的耐火材料,其特征在于,所述热压烧结的温度为1550~1800℃;优选地,所述热压烧结的压力为0.5~30MPa。
- 根据权利要求8~14中任一项所述的耐火材料,其特征在于,以所述颗粒料总质量的百分含量计,所述颗粒料的化学成分中的CaO、Al 2O 3和MgO的总含量≥97.5%,所述颗粒料的体积密度≥2.90g/cm 3。
- 一种耐火材料的制备方法,其包括下述步骤:将颗粒料和细粉混合得到混合料,将所述混合料进行热压烧结得到所述 耐火材料。
- 根据权利要求16所述的制备方法,其特征在于,所述颗粒料与所述细粉的质量比为30~65:35~70,优选为40~65:35~60。
- 根据权利要求16或17所述的制备方法,其特征在于,所述颗粒料选自CA6颗粒料、CMA颗粒料中的一种或两种。
- 根据权利要求16~18中任一项所述的制备方法,其特征在于,所述细粉包括Al 2O 3-CaO-MgO系细粉;优选地,所述细粉还包括含ZrO 2的细粉;优选地,以所述细粉总质量的百分含量计,所述细粉包含50%~100%的Al 2O 3-CaO-MgO系细粉和0~50%的含ZrO 2的细粉;优选所述细粉包含75%~100%的Al 2O 3-CaO-MgO系细粉和0~25%的含ZrO 2的细粉;优选地,所述Al 2O 3-CaO-MgO系细粉选自CA6细粉、CMA细粉、含Al 2O 3的细粉、含Al 2O 3的细粉与含CaO的细粉两者的混合粉、含Al 2O 3的细粉与含CaO的细粉及含MgO的细粉三者的混合粉中的一种或两种以上;优选地,所述含Al 2O 3的细粉选自活性α-Al 2O 3细粉、γ-Al 2O 3细粉、ρ-Al 2O 3细粉、氢氧化铝细粉、工业氧化铝细粉、白刚玉细粉、烧结刚玉细粉和板状刚玉细粉中的一种或两种以上;优选地,所述含MgO的细粉选自碳酸镁、轻烧氧化镁、水镁石、氢氧化镁、氯化镁、烧结氧化镁和电熔氧化镁中的一种或两种以上;优选地,所述含CaO的细粉选自生石灰细粉、石灰石细粉、氢氧化钙细粉、CaO·Al 2O 3细粉、CaO·2Al 2O 3细粉、12CaO·7Al 2O 3细粉中的一种或两种以上;优选地,所述含ZrO 2的细粉选自单斜氧化锆、四方氧化锆、脱硅锆和电熔氧化锆中的一种或两种以上。
- 根据权利要求16~19中任一项所述的制备方法,其特征在于,所述细粉的粒径小于0.088mm,所述颗粒料的粒径为0.088~10mm。
- 根据权利要求16~20中任一项所述的制备方法,其特征在于,所述热压烧结为将混合料放入高温装置的模具中进行热压烧结;或者,将所述混合料经常温成型后再放入高温装置的模具中进行热压烧结;或者,将所述混合料经常温成型和低温烧结后再放入高温装置进行热压烧结。
- 根据权利要求16~21所述的制备方法,其特征在于,所述热压烧结的温度为1550~1800℃;优选地,所述热压烧结的压力为0.5~30MPa。
- 根据权利要求16~22中任一项所述的制备方法,其特征在于,以所述颗粒料总质量的百分含量计,所述颗粒料的化学成分中的CaO、Al 2O 3和MgO的总含量≥97.5%,所述颗粒料的体积密度≥2.90g/cm 3。
- 一种钢水冶炼用钢包的工作衬,其特征在于,其包括权利要求1~15中任一项所述的耐火材料或者权利要求16~23中任一项所述的制备方法制备得到的耐火材料。
- 一种铝液冶炼和输运包的工作衬,其特征在于,其包括权利要求1~15中任一项所述的耐火材料或者权利要求16~23中任一项所述的制备方法制备得到的耐火材料。
- 一种工业窑炉的耐火材料衬体,其特征在于,其包括权利要求1~15中任一项所述的耐火材料或者权利要求16~23中任一项所述的制备方法制备得到的耐火材料。
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| CN118084516B (zh) * | 2024-01-23 | 2025-08-19 | 阳泉市华夏新材料科技有限公司 | 一种石灰回转窑工作衬耐碱浇注料及其制备方法和应用 |
| CN119241215B (zh) * | 2024-12-05 | 2025-03-14 | 辽宁中镁高温材料有限公司 | 一种不锈钢冶炼用高钙镁钙钛锆砖及其制备方法 |
| CN120965303B (zh) * | 2025-10-21 | 2026-01-20 | 鞍山市奥鞍耐火材料有限责任公司 | 一种镁锰铝复合尖晶石耐火材料及其制备方法 |
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- 2022-05-10 KR KR1020237042547A patent/KR20240005934A/ko active Pending
- 2022-05-10 WO PCT/CN2022/091933 patent/WO2022237769A1/zh not_active Ceased
- 2022-05-10 JP JP2023569869A patent/JP2024521050A/ja active Pending
- 2022-05-10 US US18/290,389 patent/US20240261851A1/en active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| EP4342868A1 (en) | 2024-03-27 |
| US20240261851A1 (en) | 2024-08-08 |
| EP4342868A4 (en) | 2024-11-27 |
| KR20240005934A (ko) | 2024-01-12 |
| JP2024521050A (ja) | 2024-05-28 |
| CN115321967A (zh) | 2022-11-11 |
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