CN119972731A - A secondary aluminum ash resource product and its preparation method and application - Google Patents
A secondary aluminum ash resource product and its preparation method and application Download PDFInfo
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Abstract
本发明提供了一种二次铝灰资源化处理方法，涉及工业固废资源化处理技术领域。本发明的二次铝灰资源化产物由原料经造球、自蔓延燃烧、冷却后得到，所述原料以质量份计，包括：二次铝灰80～100份、除尘灰10～20份。本发明的制备过程无需添加酸碱、氧化钙等助剂，通过铝热自蔓延反应利用反应热量完成处理，具有低能耗、低成本的优势。该方法的电耗约为120千瓦时/吨，较传统工艺能效更高。本发明的整个处理过程中无废气、废水及废渣排放，且通过高温过滤器收集烟气中的钾钠氟盐，增加产品附加值。最终得到的二次铝灰资源化产物可广泛应用于建筑材料、耐火材料和净水剂等领域，具有较好的经济效益和环境友好性，应用前景广泛。
The present invention provides a secondary aluminum ash resource treatment method, which relates to the technical field of industrial solid waste resource treatment. The secondary aluminum ash resource product of the present invention is obtained by pelletizing, self-propagating combustion and cooling the raw materials, and the raw materials include 80 to 100 parts of secondary aluminum ash and 10 to 20 parts of dust removal ash by weight. The preparation process of the present invention does not require the addition of additives such as acid, alkali, and calcium oxide, and the treatment is completed by using the reaction heat through the aluminothermic self-propagating reaction, which has the advantages of low energy consumption and low cost. The power consumption of the method is about 120 kWh/ton, which is more energy efficient than the traditional process. There is no waste gas, wastewater and waste residue emission in the entire treatment process of the present invention, and potassium, sodium and fluoride salts in the flue gas are collected by a high-temperature filter to increase the added value of the product. The secondary aluminum ash resource product finally obtained can be widely used in the fields of building materials, refractory materials and water purifiers, has good economic benefits and environmental friendliness, and has broad application prospects.
Description
Technical Field
The invention relates to the technical field of industrial solid waste recycling treatment, in particular to a secondary aluminum ash recycling treatment method.
Background
The aluminum ash is waste generated in the aluminum industrial production process, and is divided into primary aluminum ash and secondary aluminum ash according to different treatment degrees. The primary aluminum ash is mainly aluminum ash directly produced in an electrolytic aluminum working section and a regenerated aluminum melting working section, is embodied by aluminum slag directly discharged from the melting working section and scum generated by an electrolytic aluminum oxide working section, does not extract metal aluminum, and mainly comprises substances such as metal aluminum, fluoride salt, aluminum oxide, aluminum nitride and the like, and has higher metal aluminum recycling value. The secondary aluminum ash is waste after the primary aluminum ash is melted and extracted to metal aluminum or aluminum-containing waste residue generated in the aluminum refining process, the metal aluminum content is obviously reduced compared with the primary aluminum ash, and the total aluminum content is generally about 65 percent calculated by aluminum oxide.
The secondary aluminum ash has wide sources and complex components. Each chemical composition in the secondary aluminum ash causes harm to the environment and human health. The secondary aluminum ash is easy to generate hydrolysis reaction when meeting water or moist air, the aluminum nitride is easy to generate ammonia with pungent smell and pollute the air, the metal aluminum is easy to react when meeting water to generate hydrogen, the aluminum carbide is easy to react when meeting water to generate methane, and both the hydrogen and the methane have the risk of combustion explosion. The secondary aluminum ash contains higher alkali metal oxides, fluorides, chlorides and the like, and long-term accumulation can pollute soil and underground water, thereby seriously affecting ecological environment and health and safety of people. The list of dangers is included because of its apparent toxicity (T) and reactivity (R).
Through a great deal of research and study, the current treatment method for the secondary aluminum ash mainly comprises two mature process routes of wet treatment and fire treatment.
The wet treatment adopts water, acid and alkali solution as solvents, removes the reactivity in the secondary aluminum ash through wet hydrolysis and leaching, and produces gases such as ammonia gas, hydrogen gas and the like through the reaction of active components such as AlN, al and the like in the aluminum ash through hydrolysis reaction. The leached salt is prepared into a refining agent for aluminum through purification and crystallization, and the dehydrated filter cake is dried to obtain the inert high-aluminum material. However, in the wet treatment process, the produced ammonia gas is not high in absorptivity and is easy to leak, the cost of the product for preparing the ammonium salt is too high, and the tail gas is not easy to reach the standard for emission. The whole treatment process is easy to produce flammable and explosive gases such as hydrogen, methane and the like, has potential safety hazards, and has longer whole process flow, larger equipment investment, easy corrosion and short service life.
The core of the pyrogenic process is that AlN is converted into N 2 and Al 2O3 through a roasting reaction, and the application cases are that secondary aluminum ash is used for preparing calcium aluminate refining slag for steelmaking, the technology is that the secondary aluminum ash and limestone and other raw materials are subjected to ball milling, homogenization, sintering, cooling and processing to prepare a qualified-grade product, and the main phase of the calcium aluminate refining slag is 12CaO.7Al 2O3, so that the calcium aluminate refining slag can be used for desulfurizing molten steel, removing impurities and purifying molten steel. However, the existing pyrogenic process generally has the problems of high energy consumption, poor production environment, relatively difficult flue gas treatment and the like. The low-temperature pyrogenic process has the problems that the device temperature is kept low, the denitrification rate is not complete enough, fluorine and chlorine in the secondary aluminum ash are difficult to remove, and the like.
Disclosure of Invention
In view of the above, the invention provides a secondary aluminum ash recycling product, and a preparation method and application thereof. The preparation method of the secondary aluminum ash recycling product provided by the invention does not need to add an auxiliary agent, utilizes the reaction heat to complete the treatment through the self-propagating reaction of aluminum heat, has the advantages of low energy consumption and low cost, has no exhaust gas, waste water and waste residue emission in the treatment process, and has the advantage of environmental friendliness. The finally obtained secondary aluminum ash recycling product can be widely applied to the fields of building materials, refractory materials, water purifying agents and the like, and has good application prospect.
The secondary aluminum ash recycling product is obtained by pelletizing, self-propagating burning and cooling raw materials, and the raw materials comprise the following components in parts by mass:
80-100 parts of secondary aluminum ash and 10-20 parts of dust.
Preferably, the secondary aluminum ash is low-heat-value secondary aluminum ash and/or high-heat-value secondary aluminum ash. More preferably, the secondary aluminum ash is composed of low-heat-value secondary aluminum ash and high-heat-value secondary aluminum ash according to the mass ratio of (3-7): 3-7.
Preferably, the secondary aluminum ash is subjected to activation treatment before use, specifically, the secondary aluminum ash is subjected to iron removal, crushing and sieving, and then aluminum and powder are separated until the aluminum content is 1% -5%, so that the activation of the secondary aluminum ash is completed.
The invention provides a preparation method of a secondary aluminum ash recycling product, which comprises the following steps:
The first raw materials are uniformly mixed according to a proportion and then pelletized, the obtained pellets are subjected to self-propagating combustion, and the obtained pellets are cooled after the combustion is finished, so that a secondary aluminum ash recycling product is obtained.
Preferably, the length of the ball material is 40-50 mm, the width is 25-35 mm, the thickness is 15-25 mm, the water content is less than or equal to 3%, and the compressive strength is more than or equal to 10N.
Preferably, the self-propagating combustion temperature is 1100-1500 ℃ and the self-propagating combustion time is 6-8 hours. More preferably, the self-propagating combustion temperature is 1100 ℃ to 1300 ℃.
The invention provides a secondary aluminum ash recycling product for preparing building materials, refractory materials and water purifying agents, wherein the secondary aluminum ash recycling product is the secondary aluminum ash recycling product in the technical scheme.
The secondary aluminum ash recycling treatment method provided by the invention has the advantages that no acid-base, calcium oxide and other auxiliary agents are additionally added, the energy consumption is low, the treatment can be completed by utilizing the heat generated by the aluminothermic self-propagating reaction, only a fan is needed for supplying air in the whole process, and the energy consumption for treating 1 ton of secondary aluminum ash is about 120 kilowatt hours. In addition, the method has high conversion rate of aluminum nitride, high denitrification rate, no exhaust gas, waste water and waste residue emission in the treatment process, environmental friendliness, and the dust and salt are separated by utilizing a high-temperature integrated filter according to different temperature control, so that the potassium sodium fluoride volatilized at high temperature in the flue gas is collected for industrial recycling, the added value of the product is increased, the automation degree of the treatment process is high, the operation is simple and convenient, and the method has good application prospect.
Drawings
The invention is further described with reference to the following description of the drawings.
FIG. 1 shows the results of denitrification rate detection.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a secondary aluminum ash recycling product which is obtained by pelletizing, self-propagating combustion and cooling of raw materials, wherein the raw materials comprise the following components in parts by mass:
80-100 parts of secondary aluminum ash and 10-20 parts of dust.
The secondary aluminum ash of the present invention is preferably low heating value secondary aluminum ash and/or high heating value secondary aluminum ash. In some preferred embodiments of the invention, the secondary aluminum ash is composed of low-heat-value secondary aluminum ash and high-heat-value secondary aluminum ash according to the mass ratio of (3-7): 3-7.
The low-heat-value secondary aluminum ash comprises the following components:
AlN 5.09wt.％、SiO22.01wt.％、Cl 0.91wt.％、MgO 1.16wt.％、SO30.15wt.％、CaO 0.52wt.％、Fe2O30.67wt.％、K2O 0.72wt.％、MnO 1.64wt.％、CuO 0.13wt.％, The balance being Al 2O3.
The composition of the high-heat-value secondary aluminum ash is as follows:
AlN 5.210wt.％、SiO26.81wt.％、Cl 3.71wt.％、MgO 2.76wt.％、SO31.86wt.％、CaO 1.53wt.％、Fe2O31.49wt.％、K2O 0.88wt.％、MnO 0.54wt.％、CuO 0.45wt.％, The balance being Al 2O3.
The invention utilizes the mixture of the low-heat-value secondary aluminum ash and the high-heat-value secondary aluminum ash with a specific proportion as the raw material to prepare the secondary aluminum ash recycling product, can achieve the balance of heat and reaction stability, and is an important means for considering the quality of the product and the energy efficiency of the process. The low-calorific-value aluminum ash has lower calorific value, and the heat generated in the aluminothermic reaction process is limited, if the ratio is too high, the reaction can not maintain self-propagating combustion, and the treatment effect is affected. The high-calorific-value aluminum ash has higher calorific value, can provide sufficient heat for maintaining the reaction, but if the ratio is too high, the reaction process is difficult to control, the uniformity of the combustion process cannot be operated, and the recycling product with expected quality cannot be obtained. Therefore, the invention adopts a mode of controlling the proportion of the low-heat-value secondary aluminum ash and the high-heat-value secondary aluminum ash to adjust the reactivity of the secondary aluminum ash raw material, combines the heat value characteristics of the secondary aluminum ash raw material to ensure that self-propagating combustion is stably carried out in an ideal heat range, and also can avoid the waste of resources caused by high content of the high-heat-value aluminum ash or the increase of extra energy consumption caused by high content of the low-heat-value aluminum ash, thereby always ensuring that the energy consumption in the treatment process is maintained at a lower level. In addition, the performance of the secondary aluminum ash recycling product is closely related to the chemical composition of raw materials, and the low-heat-value aluminum ash and the high-heat-value aluminum ash have obvious difference in composition. After being mixed according to a reasonable proportion, the components in the final product can be balanced, and the performance requirements of the subsequent building materials, refractory materials and water purifying agents can be met.
The invention can adjust the proportion of the low-heat value aluminum ash and the high-heat value aluminum ash in a specific range according to the actual needs of raw materials so as to ensure the stability of the process and the quality of the product, and particularly, the heat value of the secondary aluminum ash after mixing is 450-1300 kilocalories/kg. In the research process of the invention, the secondary aluminum ash in the heat value range has better reactivity, and the obtained product also has better comprehensive performance, thereby being capable of meeting the production requirements of most building materials, refractory materials and water purifying agents.
The secondary aluminum ash is subjected to activation treatment before use, and specifically comprises the steps of deironing, crushing, sieving, and separating aluminum from powder until the aluminum content is 1% -5%, so that the activation of the secondary aluminum ash is completed.
The activation treatment of the secondary aluminum ash can improve the purity of the aluminum ash, ensure the quality of raw materials, reduce the waste of aluminum and reduce the excessive oxidation risk of aluminum in the subsequent reaction. In the activation treatment process, the uniformity of the granularity distribution of the raw materials can be improved through crushing, crushing and screening operations, the contact area of reactants is optimized, and the efficiency of the thermit reaction is improved. The separation process can also control the content of active components (such as aluminum and aluminum nitride) in the aluminum ash, and avoid the influence of too high or too low of certain components on the reaction balance, thereby ensuring the stability of the reaction. In addition, the self-propagating combustion of the invention has higher requirements on the grain size, the heat value and the component uniformity of the raw materials. The secondary aluminum ash without activation treatment has the problems of overlarge particle size and uneven component distribution, which can lead to incomplete reaction and uneven reaction speed, generate byproducts and influence the overall treatment effect. Through the activation treatment, the particle size of the aluminum ash can meet the process requirement of self-propagating combustion, the heat value of the reactant is ensured to be in a reasonable range, and the requirement of combustion temperature control (1100-1300 ℃) is met. Meanwhile, the content of unreacted aluminum in the aluminum ash can be reduced by the activation treatment, so that the release of a large amount of heat caused by the oxidation of a large amount of aluminum in the combustion process is reduced, and the safety and controllability of the reaction are improved.
In some specific embodiments of the invention, the secondary aluminum ash is subjected to iron removal, crushing and then is sieved by a 120-150 mesh sieve.
The raw materials of the invention also comprise a certain amount of dust. The dust-removing ash of the invention is the dust-collecting ash of the aluminum ash recycling and stir-frying or smelting links, also belongs to the dangerous waste range, has smaller particle size, higher salt content and carbon content and higher specific surface area and heat value. In the aluminum ash treatment process, the dust removal ash is used for improving the physical properties of raw materials, increasing the uniformity of reactants and promoting the stability and the uniformity of the combustion process.
The invention provides a preparation method of a secondary aluminum ash recycling product, which comprises the following steps:
The first raw materials are uniformly mixed according to a proportion and then pelletized, the obtained pellets are subjected to self-propagating combustion, and the obtained pellets are cooled after the combustion is finished, so that a secondary aluminum ash recycling product is obtained.
The length of the ball material is 40-50 mm, the width is 25-35 mm, the thickness is 15-25 mm, the water content is less than or equal to 3%, and the compressive strength is more than or equal to 10N.
The self-propagating combustion temperature of the invention is 1100 ℃ to 1500 ℃. In some preferred embodiments of the present invention, the self-propagating combustion temperature is 1100 ℃ to 1300 ℃. According to the invention, the secondary aluminum ash serving as a raw material is activated and proportioned, so that the self-propagating combustion temperature of the raw material is kept at 1100-1500 ℃, the raw material is fully combusted and denitrified, and the reactivity and combustibility of the secondary aluminum ash are removed.
In some specific embodiments of the invention, the self-propagating combustion process is carried out in a self-propagating reaction furnace, the reaction furnace is also provided with a high-temperature integrated filter, and Roots fans are arranged at the bottom and the side surfaces of the furnace. The raw materials are sent into a furnace through automatic conveying equipment, and the oxygen-enriched side blowing technology in the self-propagating combustion process enables the raw materials to be fully combusted at a specific temperature and release enough heat, so that the temperature of a heat accumulating furnace kiln can be kept between 1100 ℃ and 1500 ℃ for 6-8 hours, and the nitrogen, chlorine and fluorine are fully removed, so that the reactivity and toxicity of secondary aluminum ash are removed, and a high-quality recycling product is obtained. In the combustion process, potassium sodium fluoride in the flue gas volatilizes at high temperature, and the high-temperature integrated filter can separate and separate dust according to different temperature control, so that gaseous salt is condensed, captured and recycled to be used as industrial salt. The Roots blower plays roles in providing oxygen support, adjusting reaction temperature, promoting airflow circulation, taking away waste gas and heat, improving filter efficiency, promoting gas cooling and purification and the like in the reaction process.
The materials after the reaction in the furnace are cooled and graded to finally obtain qualified secondary aluminum ash recycling products, and the products can be used as raw materials in the fields of building materials, refractory materials, water purifying agents and the like.
In order to further illustrate the present invention, the following examples are provided.
The compositions of the low-heat-value secondary aluminum ash, the high-heat-value secondary aluminum ash, and the dust-removing ash used in the examples and comparative examples of the present invention are as follows:
The balance of the low-heat-value secondary aluminum ash ：AlN 5.09wt.％、SiO22.01wt.％、Cl 0.91wt.％、MgO1.16wt.％、SO30.15wt.％、CaO 0.52wt.％、Fe2O30.67wt.％、K2O 0.72wt.％、MnO1.64wt.％、CuO 0.13wt.％, is Al 2O3;
The balance of the high-heat-value secondary aluminum ash ：AlN 5.210wt.％、SiO26.81wt.％、Cl 3.71wt.％、MgO2.76wt.％、SO31.86wt.％、CaO 1.53wt.％、Fe2O31.49wt.％、K2O 0.88wt.％、MnO0.54wt.％、CuO 0.45wt.％, is Al 2O3;
The remainder of fly ash ：AlN 6.605wt.％、SiO22.529wt.％、Cl 1.485wt.％、MgO 0.937wt.％、SO30.830wt.％、CaO 0.657wt.％、Fe2O30.557wt.％、K2O 0.366wt.％、MnO0.173wt.％、CuO 0.028.％, is Al 2O3.
All experiments were repeated 3 times, except for the specific description. Analysis of variance (ANOVA) and Duncan multiple comparison analysis were performed using SPSS21.0, with results expressed as mean ± standard deviation, P <0.05 indicating significant differences.
Example 1a method for preparing a secondary aluminum ash recycling product comprises the following steps:
s1, removing iron from low-heat-value secondary aluminum ash and high-heat-value secondary aluminum ash, crushing, sieving with a 150-mesh sieve, and separating aluminum and powder until the aluminum content is 5% and 5% respectively to complete activation of the secondary aluminum ash;
S2, weighing 80 parts by weight of activated secondary aluminum ash (low-heat-value secondary aluminum ash: high-heat-value secondary aluminum ash=7:3, heat value of 854 kilocalories/kg) and 20 parts by weight of dust, uniformly mixing, and conveying to a high-pressure ball press machine through a screw conveyor to perform ball forming to obtain a ball material with the length of 45+/-2 mm, the width of 30+/-2 mm, the thickness of 20+/-2 mm, the average water content of 3% and the compressive strength of 10N;
S3, conveying the ball material to a distributor at the top of a kiln through a feeding belt, forming a material layer in the kiln through the distributor, igniting a local material layer by using a small amount of coal and wood for primary ignition, continuously ventilating and supplying oxygen through a Roots blower at the bottom and the side of the kiln to keep an oxygen-enriched environment so as to enable the material to burn vigorously, and enabling generated heat to spread outwards from an ignition area through heat conduction until self-propagating combustion reaction is complete, wherein the self-propagating combustion temperature is 1200 ℃ and the duration is 7 hours;
s4, cooling after combustion is completed, and obtaining a secondary aluminum ash recycling product.
Example 2
The difference with example 1 is that the raw materials are as follows:
90 parts of secondary aluminum ash (low-heat-value secondary aluminum ash: high-heat-value secondary aluminum ash=3:7, heat value is 1297 kilocalories/kg) and 10 parts of dust removal ash.
Comparative example 1
The difference is that no fly ash was added as in example 1.
Comparative example 2
The difference from example 1 is that the fly ash is replaced with the same amount of fly ash from incineration of the waste.
Comparative example 3
The difference from example 1 is that the low heating value secondary aluminum ash is high heating value secondary aluminum ash=1:9.
Comparative example 4
The difference from example 1 is that the low heating value secondary aluminum ash is high heating value secondary aluminum ash=9:1.
In the comparative example, the content of the low-heat-value secondary aluminum ash is too high, so that complete self-propagating combustion reaction cannot be realized, and a resource product which can be used for preparing subsequent products cannot be obtained, and subsequent researches are not carried out.
The denitrification rates of the raw materials of examples 1 to 2 and comparative examples 1 to 3 were measured, and the results are shown in Table 1.
TABLE 1
| Project | Denitrification rate of% |
| Example 1 | 96.17±0.37b |
| Example 2 | 97.62±0.62a |
| Comparative example 1 | 93.06±0.54c |
| Comparative example 2 | 92.98±0.78c |
| Comparative example 3 | 92.45±0.45c |
Note that the different lowercase letters of the same column in the table indicate that there is a significant difference P <0.05 between the two.
As is clear from Table 1, the composition of the raw material of the secondary aluminum ash affects the denitrification rate of the raw material, but the overall denitrification rate is maintained at a high level, whereas in comparative examples 1 to 3, the denitrification rate of the raw material is reduced to a different extent, and the reduction is more remarkable than in examples 1 to 2.
Test example 1
The products obtained in examples 1-2 and comparative examples 1-3 were used to prepare high alumina bricks by referring to example 1 of CN 110304908a, except that the products obtained in examples and comparative examples of the present invention were used instead of alumina powder, as follows:
S1, selecting high-quality raw materials;
S2, crushing, namely respectively crushing the raw materials in the first step;
S3, screening, namely respectively passing the crushed raw materials through a 180-mesh screen to obtain iron sheet powder, mullite powder and alumina powder, then passing the screened iron sheet material through a 3-mm screen, and passing the rest of the screened iron sheet material through a screen with the screen aperture of 5mm to obtain iron sheet material with the granularity of 3-5mm, wherein mullite particles with the granularity of 1-3mm and high-alumina materials with the granularity of 0.5-1mm are obtained in the same way;
S4, preparing materials, namely, 8 parts of iron sheet materials, 30 parts of mullite particles, 22 parts of high aluminum materials, 21 parts of iron sheet material powder, 7 parts of mullite powder, 5 parts of secondary aluminum ash recycling products and 7 parts of Guangxi white mud, firstly adding the iron sheet materials, the mullite and the high aluminum materials, stirring, then adding 3 parts of water, the iron sheet materials, the mullite powder and the alumina powder, continuously stirring until uniformity;
s5, molding, namely stamping the mixed raw materials by a 400 ton press for 6 times to form;
s6, drying, namely drying the formed semi-finished product for 20 hours at 110 ℃;
S7, checking the semi-finished product, namely screening out the semi-finished product which does not meet the requirements;
And S8, firing, namely controlling the ambient temperature to be about 30 ℃, heating the qualified semi-finished product to 1490 ℃ at 5 ℃ per minute, and then preserving the heat for 8 hours to obtain the finished product.
The performance of the obtained high-alumina brick is detected, and specific indexes are as follows:
the refractoriness (degree C) is more than or equal to 1790;
the softening temperature under load (degree C) is 0.2MPa multiplied by 0.6 percent and is more than or equal to 1510;
The volume density (g/cm 3) is more than or equal to 2.48;
The apparent porosity (%) is less than or equal to 20;
The high-temperature compressive strength (MPa) is more than or equal to 55.06;
the high-temperature creep rate (0.2 MPa, 1280 ℃ and 2 h) is less than or equal to 0.7;
The change of the re-burning line is 1500 ℃ multiplied by 2h% (minus or plus 0.3);
the thermal stability (1100 ℃ water cooling) is more than or equal to 15.
The results of the performance test of each high alumina brick are shown in Table 2.
Table 2 high alumina brick performance test results
As can be seen from Table 2, the dust-removing ash and the low heat value secondary aluminum ash, and the high heat value secondary aluminum ash
Test example 2
The products obtained in examples 1-2 and comparative examples 1-3 were used to prepare fused cast alumina refractory products for glass melting furnaces, by referring to example 1 of CN 112110716a, except that the alumina was replaced with the equivalent products obtained in examples 1-2 and comparative examples 1-3, in the following manner:
s1, mixing, namely weighing 32kg of secondary aluminum ash recycling products, adding 26.3kg of zircon sand, 10kg of desilicated zirconium, 1kg of sodium carbonate, 2.5kg of calcium silicate and 1.2kg of ferric oxide, uniformly mixing, crushing by a crusher, sieving by a screen with the aperture of 700 mu m, and continuously crushing particles with the particle size of more than 700 mu m until the particle size is not more than 700 mu m, thus preparing a mixture;
S2, melting, namely transferring the mixture into an electric arc furnace, heating to 2000 ℃ by using a graphite electrode, melting for 130min to obtain molten liquid, inserting an air outlet end of an oxygen gun into a position 40cm below the liquid level of the molten liquid, introducing oxygen into the molten liquid by using the oxygen gun, performing primary oxygen blowing treatment for 8min, controlling the oxygen pressure to be 0.4MPa, stopping oxygen blowing at the flow rate of 450L/h, continuing refining for 18min at 2000 ℃, and introducing oxygen into the molten liquid for secondary oxygen blowing treatment for 8min to obtain casting liquid;
And S3, pouring, namely taking 1.8kg of yttrium oxide and 3kg of tetragonal nano zirconium oxide, uniformly mixing, transferring into a sand mould in an insulation box, pouring casting liquid into the mould, and cooling to 60 ℃ in 10 days to obtain the fused cast aluminum oxide refractory product for the glass melting furnace, wherein the size of the fused cast aluminum oxide refractory product is 80cm x 40cm x 10 cm.
The results of the energy test for the fused cast alumina refractory for each glass melting furnace are shown in Table 3.
TABLE 3 detection of the Performance of fused cast alumina refractory products for glass melting furnaces
| The normal temperature compressive strength, MPa, | Normal temperature flexural strength, MPa | |
| Example 1 | 31.55±0.55a | 7.38±0.38a |
| Example 2 | 32.03±0.57a | 7.46±0.46a |
| Comparative example 1 | 27.76±0.24c | 6.79±0.21ab |
| Comparative example 2 | 28.08±0.42c | 6.64±0.36b |
| Comparative example 3 | 30.29±0.29b | 6.94±0.56ab |
Note that the different lowercase letters of the same column in the table indicate that there is a significant difference P <0.05 between the two.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The secondary aluminum ash recycling product is characterized by being obtained by pelleting, self-propagating combustion and cooling of raw materials, wherein the raw materials comprise the following components in parts by mass:
80-100 parts of secondary aluminum ash and 10-20 parts of dust.
2. The secondary aluminum ash recycling product according to claim 1, wherein the secondary aluminum ash is low heating value secondary aluminum ash and/or high heating value secondary aluminum ash.
3. The secondary aluminum ash recycling product according to claim 2, wherein the secondary aluminum ash is composed of heat value secondary aluminum ash and high heat value secondary aluminum ash according to the mass ratio of (3-7): 3-7.
4. The secondary aluminum ash recycling product according to claim 1 is characterized in that the secondary aluminum ash is subjected to activation treatment before use, specifically, iron is removed from the secondary aluminum ash, the secondary aluminum ash is crushed, crushed and sieved, and then aluminum and powder are separated until the aluminum content is 1% -5%, so that the activation of the secondary aluminum ash is completed.
5. The secondary aluminum ash recycling product according to claim 1, wherein the raw material further comprises 5 parts by mass of fluorine fixing agent.
6. The method for preparing the secondary aluminum ash recycling product according to any one of claims 1-5, which specifically comprises the following steps:
The first raw materials are uniformly mixed according to a proportion and then pelletized, the obtained pellets are subjected to self-propagating combustion, and the obtained pellets are cooled after the combustion is finished, so that a secondary aluminum ash recycling product is obtained.
7. The preparation method of claim 6, wherein the ball material has a length of 40-50 mm, a width of 25-35 mm, a thickness of 15-25 mm, a water content of less than or equal to 3% and a compressive strength of more than or equal to 10N.
8. The method according to claim 6, wherein the self-propagating combustion temperature is 1100 ℃ to 1500 ℃ and the self-propagating combustion time is 6 to 8 hours.
9. The method of claim 8, wherein the self-propagating combustion temperature is 1100 ℃ to 1300 ℃.
10. The application of the secondary aluminum ash recycling product in preparing building materials, refractory materials and water purifying agents is characterized in that the secondary aluminum ash recycling product is the secondary aluminum ash recycling product prepared by any one of claims 1-5 or the secondary aluminum ash recycling product prepared by any one of claims 6-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11300333A (en) * | 1998-04-24 | 1999-11-02 | Tomoji Tanaka | Effective use of aluminum ash, a by-product of recycled aluminum |
| CN211232880U (en) * | 2019-08-14 | 2020-08-11 | 航天环境工程有限公司 | A high- and low-calorific value hazardous waste co-incineration melting harmless treatment system |
| CN115537556A (en) * | 2022-10-18 | 2022-12-30 | 中南大学 | A porous ceramic heat storage ball and method for preparing porous ceramic heat storage ball based on secondary aluminum ash |
| CN115608754A (en) * | 2022-09-21 | 2023-01-17 | 兰溪市博远金属有限公司 | A method for self-denitration and harmless treatment of secondary aluminum ash oxygen-enriched roasting |
| CN116408329A (en) * | 2021-12-31 | 2023-07-11 | 上海善是科技有限公司 | A kind of harmless treatment and reuse process of aluminum ash |
| CN117564063A (en) * | 2023-11-06 | 2024-02-20 | 浙江工商大学 | A method for denitrification by autothermal calcination of multi-source aluminum ash |
| CN118084509A (en) * | 2024-02-28 | 2024-05-28 | 巩义新格新材料有限公司 | A method for producing refractory auxiliary material |
| CN118080535A (en) * | 2024-03-01 | 2024-05-28 | 永济市和力佳成环保科技有限公司 | A method for treating aluminum ash |
-
2025
- 2025-02-11 CN CN202510150182.9A patent/CN119972731A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11300333A (en) * | 1998-04-24 | 1999-11-02 | Tomoji Tanaka | Effective use of aluminum ash, a by-product of recycled aluminum |
| CN211232880U (en) * | 2019-08-14 | 2020-08-11 | 航天环境工程有限公司 | A high- and low-calorific value hazardous waste co-incineration melting harmless treatment system |
| CN116408329A (en) * | 2021-12-31 | 2023-07-11 | 上海善是科技有限公司 | A kind of harmless treatment and reuse process of aluminum ash |
| CN115608754A (en) * | 2022-09-21 | 2023-01-17 | 兰溪市博远金属有限公司 | A method for self-denitration and harmless treatment of secondary aluminum ash oxygen-enriched roasting |
| CN115537556A (en) * | 2022-10-18 | 2022-12-30 | 中南大学 | A porous ceramic heat storage ball and method for preparing porous ceramic heat storage ball based on secondary aluminum ash |
| CN117564063A (en) * | 2023-11-06 | 2024-02-20 | 浙江工商大学 | A method for denitrification by autothermal calcination of multi-source aluminum ash |
| CN118084509A (en) * | 2024-02-28 | 2024-05-28 | 巩义新格新材料有限公司 | A method for producing refractory auxiliary material |
| CN118080535A (en) * | 2024-03-01 | 2024-05-28 | 永济市和力佳成环保科技有限公司 | A method for treating aluminum ash |
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