JPH0971478A - Pour refractory composition and method for drying furnace wall using the same - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To obtain a dense construction body capable of preventing the explosive phenomenon during heating and drying after construction of a cast refractory, which is capable of rapid drying, and a rapid heating and drying method using the same. Offer. A refractory aggregate, a refractory powder, an Al-Si alloy powder and a dispersant are contained, and the Al-Si alloy powder is 0.04 to 100 parts by weight per 100 parts of the total amount of the refractory aggregate and the refractory powder. After the composition containing 3 parts is applied to a desired portion, the surface temperature of the amorphous refractory material is raised at 50 to 400 ° C./hour and heated and dried.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a lining material for various kilns, a lining material for refining vessels such as ladle, a lance for refining, a lining material for gutter, etc. The present invention relates to a refractory composition and a method for drying a furnace wall formed by using the composition.

[0002]

2. Description of the Related Art Amorphous refractories require less labor for construction, can be constructed in any shape, and have improved performance as refractories, and are increasingly used in recent years. Cast-in refractory, which is a type of irregular refractory, has good workability, and its basic unit and unit price have been remarkably reduced due to improvements in technology for improving durability and additional repairs. The mainstream of things.

[0003] As for cast refractories, those using various bonding methods have been put into practical use due to the recent development of materials and construction techniques, and a fine structure is formed by combining various ultrafine powders, dispersants, flocculants and the like. The obtained construction body can be obtained. However, these dense cast refractories construction bodies,
It is heated to remove water mixed during construction by drying, and when the temperature rises, water vapor is trapped inside the construction body, and the pressure causes cracks or breaks in the construction body (hereinafter, explosion or explosion phenomenon) Problem). For this reason, the drying of the dense refractory that has been cast is performed slowly over a long period of time, which requires a longer construction period.

In order to prevent this explosion and shorten the construction period, aluminum powder (hereinafter referred to as A)
l powder) is added, and H ₂ gas is generated by a reaction with an alkaline aqueous solution of Ca ²⁺ contained in alumina cement, and a vent hole for releasing water vapor is formed in advance.
Explosion prevention technology has been proposed (Japanese Patent Publication No. 61-381).
54 etc.).

However, since the Al powder has a high activity and the reaction progresses too fast, there has been proposed a method of coating the particle surface of the Al powder with an organic substance or the like to suppress the reaction (Japanese Patent Laid-Open Publication No. Sho 5).
8-120573). In addition, when Al powder is used for the purpose of preventing explosion, generated H ₂ is flammable, and is liable to explode in construction in a closed space, so that careful handling is required. Further, JP-A-58-2174
In No. 72, Al-Si is used to improve the strength of the amorphous refractory.
The addition of alloy powder has been proposed.

[0006] However, the Al-Si alloy powder there is
Used to reinforce the joints of the refractory that has been applied and to improve resistance to mechanical and chemical wear at high temperatures. No disclosure is made about the solution to the problem that arises.

Recently, as a safer explosion-proof technique than Al powder, a method has been proposed in which organic or inorganic fibers are added to the composition to form air holes (JP-A-59-19).
0276). In addition, Japanese Patent Laid-Open No. 62-100453 discloses that
A method for preventing explosion has been proposed in which basic aluminum lactate is added in addition to Al powder to generate fine cracks in the refractory structure to form ventilation holes.

[0008]

When Al powder is added, the construction body may expand due to the pressure of the generated H ₂ gas to become porous, and the internal structure of the refractory can be changed by the pressure of the H ₂ gas. The composition for casting refractory containing cracks and containing Al powder lacks storability because the Al powder has high activity. In addition, the cast refractory to which Al powder is added is affected by the fact that the exothermic reaction depending on the application temperature and the type of alumina cement to be blended is not constant, and it is possible to obtain a refractory construction having a stable quality. It was difficult.

[0009] Methods proposed Al powder particle surface as a solution to these problems is coated with organic material, albeit the effect of improving the storage stability, it is difficult to adjust the timing of generating the H ₂ gas, H ₂ There is a problem that it is difficult to uniformly disperse gas bubbles in the castable construction body, and coarse gas bubbles are partially formed, thereby lowering the durability of the refractory.

In addition, the method of adding organic fibers, which has been proposed as a safe method without the risk of ignition explosion due to the generated H ₂ gas, is inferior in the dispersibility of the organic fibers in the clay, and is required at the time of construction. However, there is a drawback that the amount of the refractory is limited due to an increase in water content and impaired durability of the refractory, and it is difficult to obtain a good refractory construction.

In addition, the method of adding basic aluminum lactate has a problem that layered cracks are liable to be generated in a construction body due to a large shrinkage upon drying, and the durability of a refractory is impaired. The present invention provides a castable refractory of a quality that can provide a dense refractory construction, does not explode even when subjected to rapid drying, and has no danger of igniting generated H ₂ gas. Aim.

[0012]

First, the refractory composition of the present invention is kneaded with water, applied to a desired portion by pouring, and then dried rapidly to form a furnace wall. A refractory composition of fixed form, comprising a refractory aggregate,
Refractory powder, aluminum-silicon alloy (hereinafter referred to as Al
-Si alloy) A powder and a dispersant are contained in the cast refractory composition.

The furnace wall drying method of the present invention further comprises a refractory aggregate, a refractory powder, an Al-Si alloy powder and a dispersant, and the Al-Si alloy powder is a combination of the refractory aggregate and the refractory powder. An unshaped refractory kneaded clay obtained by mixing a predetermined amount of water with a composition for refractory contained in an amount of 0.04 parts by weight or more based on 100 parts by weight is poured into a desired furnace wall forming location. The refractory is heated and dried by heating the surface of the refractory that has been applied, and then heating the surface of the applied refractory at a heating rate of 50 ° C. or more per hour, and performing the heat treatment until the surface temperature of the refractory reaches at least 500 ° C. It is a method for drying a furnace wall characterized by:

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail and preferred embodiments. The fire-resistant aggregate of the present invention,
A composition for a cast refractory material containing a refractory powder, an Al-Si alloy powder and a dispersant is added with water at the time of construction and kneaded,
It is constructed by the pouring construction method. The refractory aggregate is a main component of the refractory, and the refractory powder is a component for filling the gap between the refractory aggregates and forming a joint for connecting the refractory aggregates. The dispersant is added to increase the fluidity of the kneaded clay obtained by adding water to the composition.

The conventional cast refractory composition contains Al powder for the purpose of preventing explosion. This Al powder is easy to react with the alkaline aqueous solution, and it is difficult to adjust the amount and timing of H ₂ gas generation. However, in the case of using Al—Si alloy powder, the amount of H ₂ gas generated and the timing of generation are adjusted. it can. This is because the Si component contained in the Al-Si alloy suppresses the reactivity of the Al component and suppresses the generation of H ₂ gas. This generation of H ₂ gas is less likely to be affected by the alumina cement type and construction temperature as compared with the case of adding Al powder, H ₂
A gas generation reaction occurs slowly, and a vent hole suitable for releasing water vapor can be surely formed.

Due to the presence of the formed air holes, the cast refractory construction does not explode even if the temperature rises considerably rapidly during drying. Furthermore, the risk of ignition explosion due to the generation of H ₂ gas can also be easily prevented by the occurrence of rapid H ₂ gas as refractories obtained by adding Al powder does not occur. Further, Al-Si alloy powder is less likely to react with moisture in the air than Al powder, and for example, a bag-filled composition for a cast refractory material has good storage stability.

The amount of the Al-Si alloy powder added to the composition is 10 times the total amount of the refractory aggregate and the refractory powder in the composition.
It is 0.04 parts by weight or more, preferably 3 parts by weight or less with respect to 0 parts by weight. If the amount is less than 0.04 part by weight, the generation of H ₂ gas is small and it is difficult to obtain the effect of preventing explosion. If it is more than 3 parts by weight, the amount of H ₂ gas generated increases, and the refractory after construction tends to swell or crack. If many bubbles are generated and become porous, the strength of the refractory decreases. . A more preferable amount of Al-Si alloy powder is 0.1 to 2.0 parts by weight.

The Al-Si alloy powder contained in the cast refractory composition of the present invention preferably contains 60 to 95 Al.
% Of Si and 5 to 40% by weight of Si. Al-
If the Si component in the Si alloy is more than 40% by weight, the generation of H ₂ gas is slow and the generation amount is small, so that the explosion prevention effect is small. Further, when the Si component is less than 5% by weight, H ₂ is actively generated, and swelling or cracking of the refractory body tends to occur depending on the components mixed in the composition. A more preferable Al-Si alloy powder contains 70 to 70% Al.
It contains 93% by weight and Si of 7 to 30% by weight.

The Al-Si alloy powder contained in the cast refractory composition of the present invention is preferably made of an Al component and Si
The total amount of the components is 90% by weight or more, and the particle size is 0.074 m
m or less and 40% by weight or more.

When the total amount of Al and Si is 90% by weight or more, a favorable effect that variation in the reaction start time can be reduced can be obtained. Al in Al-Si alloy
The total amount of Si and Si is more preferably 95% by weight or more. Also,
When the Al-Si alloy powder contains 40% by weight or more of particles having a particle size of 0.074 mm or less, a reliable explosion prevention effect can be obtained. If the amount of particles having a particle size of 0.074 mm or less is less than 40% by weight, the generation of H ₂ is small, and the explosion prevention effect is reduced. A more preferred Al-Si alloy powder has a particle size of 0.1.
It contains 50% by weight or more of particles of 074 mm or less.

The alloy powder used in the present invention is Al-
Although it is a Si alloy powder, other alloy powders and metal powders may be used in a small amount together within a range that does not hinder the operation.

The Al-Si alloy powder is preferably an alloy powder in which an Al component and a Si component are uniformly dispersed. Such alloy powder can be produced by an atomizing method or a method of pulverizing a molten solidified product of the alloy.

As the refractory aggregate, one selected from alumina, bauxite, diaspore, mullite, shale shale, chamotte, silica, pyrophyllite, sillimanite, andalusite, spinel, magnesia, silicon carbide and graphite. The above can be preferably used. As the refractory powder, at least one selected from alumina cement, refractory clay, pulverized refractory aggregate powder, fumed silica and ultrafine alumina can be preferably used.

As the refractory powder, it is preferable to use a powder having an average particle diameter of 30 μm or less so that a good joint can be formed. Further, as a part of the refractory powder, it is preferable to use an ultrafine powder having an average particle diameter of alumina or fumed silica of 3 μm or less, preferably 1 μm or less. The use of ultrafine powder of alumina or fumed silica can reduce the amount of water mixed with the composition, and can impart good fluidity to the kneaded clay.

Further, when alumina cement is used as a part of the refractory powder, the alumina cement contributes to the bonding of the refractory for pouring, and the construction body can give practical strength in a wide range from normal temperature to high temperature. .

The preferred blending amount of alumina cement is 1 to 1 per 100 parts by weight of the total amount of the refractory aggregate and the refractory powder.
0 parts by weight. Alumina cement is CaO / Al ₂ O
By using a molar ratio of ₃ of 1.3 or less, a sufficiently long working time can be secured for the kneaded kneaded clay.

When a refractory clay is used as a part of the refractory powder, a clay-bonded pouring refractory having good workability can be obtained.

In the present invention, the mixing ratio of the refractory aggregate and the refractory powder is usually 75 to 95% by weight for the former and 5 to 95% for the latter.
25% by weight is preferred.

Further, in order to impart excellent fluidity to the kneaded kneaded material, it is preferable to add to the composition a dispersant selected according to the types of the refractory aggregate and the refractory powder to be used.
Further, if a powdery dispersant is used, it is easy to add the dispersant to the composition to be packed beforehand. As the dispersant, one or more selected from polyphosphates, polycarboxylates, polyacrylates and β-naphthalenesulfonates can be preferably used. The dispersant is preferably added in an amount of 0.02 to 1 part by weight based on 100 parts by weight of the total amount of the refractory aggregate and the refractory powder in the composition.

The cast refractory containing alumina cement has a non-constant curing time depending on the construction temperature and the type of alumina cement, and the curing is slow at a low temperature of 15 ° C. or lower.
Some cure at about 30 ° C slows down, while others over 30 ° C cure rapidly. It is preferable to use a curing accelerator or a curing retarder in addition to use in order to make the curing time independent of the surrounding temperature conditions.

As the curing accelerator, quick lime, lithium carbonate and calcium chloride can be preferably used. As the curing retarder, nitrates, phosphates, lignin sulfonates, and gluconates can be preferably used. The amount of these additives is preferably in the range of 0.01 to 1 part by weight with respect to 100 parts by weight of the total amount of the refractory aggregate and the refractory powder, and is preferably adjusted according to the construction temperature and the type of alumina cement. .

The amount of water mixed with the composition varies depending on the specific gravity and porosity of the refractory aggregate and the refractory powder contained in the composition. There is a lower limit to the amount of water that can impart fluidity to the kneaded clay, and normally, a water amount of 4 parts by weight or more is required for 100 parts by weight of the total amount of the refractory aggregate and the refractory powder. Further, the amount of water mixed in the composition is 100, which is the total amount of the refractory aggregate and the refractory powder, in order to reduce the porosity of the refractory after the construction and ensure good physical properties as the refractory. It is preferably 12 parts by weight or less, and more preferably 10 parts by weight or less with respect to parts by weight. If the amount of water mixed with the composition is large, the refractory aggregate tends to settle, and the applied refractory tends to be heterogeneous.

In the present invention, such a composition for a cast refractory is kneaded with water and applied to a desired portion by pouring, and then a furnace wall which does not cause a blast phenomenon even if it is rapidly heated and dried. It can be formed and can be used for such a purpose.

That is, the cast refractory composition of the present invention is prepared by mixing the composition based on the above-mentioned mixing ratio with water for imparting fluidity and pouring the mixture into the furnace wall forming portion (the refractory powder is In the case of a composition having insufficient self-fluidity, such as alumina cement alone or clay added, it is applied while applying vibration, and the surface temperature of the amorphous refractory is at least 50 ° C./hour after hardening of the applied product. As described above, preferably, the explosion phenomenon does not occur even when dried up to a maximum of 1400 ° C at a heating rate of 400 ° C or less per hour.

If the heating rate is less than 50 ° C./hr, it is less superior to the conventional drying method, and the drying time is not particularly shortened. If it exceeds 400 ° C./hr, a considerably large drying means is required. Even if the temperature is raised quickly, the heat storage in the furnace wall becomes insufficient and complete dehydration takes time, so it is not practical in many cases. Further, when the temperature exceeds 400 ° C./hour, there is a problem that spalling cracks are formed on the surface of the amorphous refractory.

The temperature rising rate can be selected and determined according to the composition ratio of the composition, the shape and thickness of the furnace wall to be formed, the operating conditions to which the furnace wall is exposed, etc. In many cases, 100 ° C. or more per hour is sufficient, depending on the case. Is also possible at 300 ° C. or more per hour.

As for the maximum heating temperature, depending on the furnace, a furnace wall that can be used is formed if heat treatment is performed up to about 500 ° C., but normally, a desired furnace wall is formed by heating to 1000 ° C. or higher. Since rapid heating and drying and drying in a short time are possible in this manner, the furnace can be quickly restarted.

In the present invention, the surface temperature at the time of heating and drying means 1-2 from the surface of the refractory material constructed as the furnace wall.
It is the temperature measured at the tip of a thermometer (usually a thermocouple) embedded at the mm position.

In the present invention, the heating rate is also influenced by the thickness of the irregular refractory material. For example, the thicker the construction thickness, the longer it takes to dry inside.

However, the applied thickness of the refractory composition of the present invention is usually in the range of about 100 to 1000 mm. Therefore, if the composition is heated and dried at a predetermined heating rate until the surface temperature reaches 500 ° C. or higher, the temperature rises. The furnace wall can be formed without causing explosions or cracks during hot drying. At this time, there is no problem even if there is an undried portion in the interior, because the interior is gradually dried by the heat received when the furnace is actually used.

In general, the refractory composition of the present invention is applied to a furnace from the back of the furnace on an inner surface on which a permanent refractory and an adiabatic refractory are sequentially applied.

The Al—Si alloy powder finally becomes A
Since it changes into l ₂ O ₃ and SiO ₂ and becomes a refractory component, it has excellent characteristics as a refractory, and the volume increases when the Al—Si alloy powder is changed to Al ₂ O ₃ and SiO ₂ . A cast refractory with excellent volume stability is obtained. Further, in the construction body made of the composition for a cast refractory material of the present invention, Al ₂ O ₃ produced by the oxidation of Al-Si alloy powder.
Since SiO ₂ and SiO ₂ contribute to the bond strength, a refractory furnace wall having excellent strength can be obtained.

[0043]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited thereto.

As a refractory aggregate, an Al ₂ O ₃ content of 89
Coarse particles having a particle size of 1.68 to 5 mm, medium particles having a particle size of 0.1 to 1.68 mm, and a weight ratio of 7% by weight, a SiO ₂ content of 7% by weight and an Fe ₂ O ₃ content of 1.3% by weight; Particle size 0.02-
Bauxite aggregate consisting of fine grains having a diameter of 0.1 mm and an average particle diameter of 0.03 mm was used.

Further, the refractory powder constituting the coupling portion of the refractory, with Al ₂ O ₃ 55 wt% and the content of CaO is respectively 36 wt%, average particle diameter 9μm alumina cement, Al ₂ The purity of O ₃ is 99.6% by weight, the average particle size is 4.3 μm, and the purity of SiO ₂ is 9.
Fumed silica having an average particle diameter of 0.8 μm at 3% by weight was used. As the dispersant, powder of sodium tetraphosphate (Na ₆ P ₄ O ₁₃ ) having P ₂ O ₅ and Na ₂ O ₄ contents of 60.4% by weight and 39.6% by weight, respectively, was used.

As the Al-Si alloy powder, Al component 8
Alloy powder (a) containing 0% by weight and 20% by weight of Si component and Al
Alloy powder containing 90% by weight of Si component and 10% by weight of Si component (b)
Was used. The average particle sizes of the Al-Si alloy powders (a) and (b) are 28 μm and 30 μm, respectively, and the particle size is 0.0
It contains 92% and 89% of particles of 74 mm or less, respectively. The Al powder used in the comparative example had a purity of 99% and an average particle size of 30 μm.

Refractory aggregate, refractory powder, dispersant, Al-
The Si alloy powder and the Al powder were weighed to obtain a cast refractory composition having the formulation (unit: parts by weight) shown in the table.
Then, the total amount of the refractory aggregate and the refractory powder in the composition is 1
To 00 parts by weight, add the amount of water (parts by weight) shown in the table,
The mixture was kneaded in a universal mixer for 3 minutes and poured into a refractory kneaded material. This kneaded clay has an inner size of 40 mm × 40 mm × 160 mm
It was poured into the mold and the mold having an inner diameter of 100 mm and a height of 100 mm to obtain cast refractory specimens (Examples 1 to 11).

Regarding the fluidity of the cast refractory kneaded clay, in Examples 1 to 11 having self-fluidity, each kneaded clay immediately after kneading had an upper end inner diameter of 50 mm, a lower end inner diameter of 100 mm, and a height of 150 m.
m, and poured into a truncated cone-shaped cone with open upper and lower ends to fill the cone, and withdraw the cone upward.
The spread diameter of the clay when allowed to stand for 2 seconds was measured with calipers in two directions, and the average value was defined as the clay flow value.

The porosity and bulk specific gravity of the test specimen were 2 at 110 ° C.
After drying for 4 hours, it was measured according to the method specified in JIS-R2205. Flexural strength is 40mm x 40m
With respect to the test piece of m × 160 mm, the test piece was cured at room temperature, and the test piece after drying was fired at 1400 ° C. for 1 hour. The dimensional change rate was measured by measuring the dimensional change of the test piece fired at 1400 ° C. for 1 hour, and expressed as a ratio based on the dimension before firing. In the table, "swelling" means that remarkable swelling of about several percent was observed. The presence or absence of cracks is the result of examining the appearance of the test piece that had been demolded after curing. Explosion resistance is a diameter of 10
A specimen of 0 mm × 100 mm in height was placed in an electric furnace maintained at 1200 ° C., and the presence or absence of explosion was examined and evaluated. Table 1
In, Examples 1 to 7 are examples of the present invention, and Examples 8 to 1
1 is a comparative example.

[0050]

[Table 1]

Table 2 shows Examples 12 to 17 of the test results of the cast refractories in which the refractory powder was mixed with a large amount of alumina cement and no other refractory powder was mixed. Since the kneaded material of the refractory for pouring does not have sufficient self-fluidity, the flow value was measured by using the flow cone specified in JIS-R5201 and pouring the kneaded material immediately after kneading into the flow cone placed on the vibrating table. After filling, give 3G vibration, 1
The spread diameter of the kneaded clay after 0 seconds was measured with a caliper in two directions, and the average value was used as the flow value. The other evaluation methods were the same as in Example 1.

Further, Table 2 shows the test results of cast refractories containing clay as Examples 18 to 22. The refractory aggregates, refractory powders and other raw materials used are from Example 1
11 and the evaluation method is the same as in Examples 12 to 17. In Table 2, Examples 12 to 15 and Examples 18 to 20 are Examples of the present invention, and Examples 16, 17, 21 and 22 are Comparative Examples. "Swelling" in the column of dimensional change rate in Table 1 and Table 2
Means that a significant swelling of the order of a few percent was observed. In addition, the negative dimensional change rate (contraction) of Examples 16 and 21 has a negative display.
Means that

[0053]

[Table 2]

As can be seen from Tables 1 and 2, the Al of the present invention is
-When a composition for a cast refractory containing Si alloy powder is used, even if the constructed refractory is dense, a vent hole for releasing water vapor is secured, and thus a cast refractory containing Al powder is used. No swelling or cracking occurs due to the generation of H ₂ gas, and no explosion occurs even if the temperature is rapidly raised and dried. The physical properties of the cast pouring refractories are also good because they are dense. On the other hand, in a cast refractory containing Al powder, swelling or cracking occurs when the content of Al powder is large, and the preferable content of Al powder changes depending on the kneading temperature of the kneaded clay.

Example 23 (Example) The cast refractory material of Example 3 in Table 1 was used as a mini tundish of 1000 mm × 10.
It was applied to the 00 mm portion. The thickness of this refractory is 25
Insulation castable 100 on the back with 0mm
It has been constructed to a thickness of mm. After curing, one-side heating was performed using an oil burner, and the surface temperature of the furnace wall was increased to 1000 ° C. at a rate of 200 ° C./hour and dried. The temperature distribution in the mini-tundish furnace was about ± 20 ° C. There was no explosion during drying, and no cracks were found on the furnace wall surface after the drying was completed. A cross section was observed by cutting in the thickness direction, but no crack was found.

Example 24 (Example) The amorphous refractory composition of Example 6 in Table 1 was applied to a mini tundish in the same manner as in Example 23, and a drying test was conducted. In this case, the surface temperature of the furnace wall is set to 3
The temperature was raised at a heating rate of 00 ° C., and the temperature was dried to 1400 ° C.
Explosion did not occur during drying, and no cracks were observed on the furnace wall surface or internal cut surface after completion of drying.

Example 25 (Example) The amorphous refractory composition of Example 18 in Table 2 was applied to a mini-tundish while applying vibration in the same manner as in Example 23, and a drying test was conducted. in this case,
The surface temperature of the furnace wall is 1000 ℃ at a heating rate of 100 ℃ per hour
The temperature was raised to and dried. Similarly, there was no explosion during drying, and no cracks were observed after drying.

Example 26 (Comparative Example) The amorphous refractory composition of Example 11 in Table 1 was applied to a mini tundish in the same manner as in Example 23, and a drying test was conducted. In this case, the surface temperature of the furnace wall was increased to 1200 ° C. at a heating rate of 200 ° C./hour and dried, but during the drying, explosion occurred and a part of the surface of the furnace wall was blown off and peeled off. After the drying was completed, many cracks were observed in the furnace wall.

[Example 27 (Comparative Example)] The amorphous refractory composition of Example 14 in Table 2 was applied to a mini tundish while vibrating in the same manner as in Example 23, and the surface temperature of the furnace wall was 500 per hour.
The temperature was raised to 1000 ° C. and dried at a temperature rising rate of ° C. No explosion was observed during the heating and drying, but after the drying was completed, countless spalling cracks were observed on the furnace wall surface.

From the above results, a correlation was observed when the drying test in the mini tundish was compared with the crack and explosiveness tests in the composition, and the evaluation in the composition was performed on the furnace wall under a rapid temperature rising condition. It was found that the method can also be applied to the evaluation of the forming method.

[0061]

EFFECTS OF THE INVENTION The cast refractory composition of the present invention containing a predetermined amount of Al-Si alloy powder has a good storability because the activity of the Al-Si alloy powder is smaller than that of Al powder. In the kneaded clay mixed with water, the Al-Si alloy powder reacts more slowly with the alkaline aqueous solution than the Al powder,
Since a passage for water vapor to escape is secured in the construction body, it will not explode even if the temperature rises rapidly and it dries. Further, a refractory material that is dense and has excellent high temperature characteristics can be obtained.

Further, the method for drying the furnace wall of the present invention does not require the conventional long drying time, and the drying by direct fire can be adopted, and the working machine can be remarkably shortened. Further, the unit cost of the raw material can be reduced, the construction work, environmental safety and the like can be improved, and its industrial value is enormous.

Claims (14)

[Claims] 1. A composition for a refractory having an irregular shape capable of forming a furnace wall by rapidly drying after being kneaded with water and applied at a desired location, and is a fire-resistant aggregate or fire-resistant composition. A composition for a cast refractory material, which comprises a conductive powder, an aluminum-silicon alloy powder and a dispersant. 2. The aluminum-silicon alloy powder,
For a total amount of 100 parts by weight of refractory aggregate and refractory powder,
The cast refractory composition according to claim 1, which is contained in an amount of 0.04 to 3 parts by weight. 3. The aluminum-silicon alloy powder according to claim 1,
For a total amount of 100 parts by weight of refractory aggregate and refractory powder,
The cast refractory composition according to claim 2, which is contained in an amount of 0.1 to 2 parts by weight. 4. The aluminum-silicon alloy powder,
The cast refractory composition according to claim 1, 2 or 3, which contains 60 to 95% by weight of Al and 5 to 40% by weight of Si. 5. The aluminum-silicon alloy powder,
The cast refractory composition according to claim 4, which contains 85 to 93% by weight of Al and 7 to 15% by weight of Si. 6. The aluminum-silicon alloy powder,
The cast refractory composition according to claim 1, 2, 3, 4 or 5, wherein the total content of Al and Si is 90% by weight or more, and 40% by weight or more of particles having a particle size of 0.074 mm or less are contained. . 7. The cast refractory composition according to claim 1, wherein said refractory powder contains alumina cement or refractory clay. 8. Refractory aggregate, refractory powder, aluminum
It contains a silicon alloy powder and a dispersant, and the aluminum-silicon alloy powder is a total amount of refractory aggregate and refractory powder of 100.
An unshaped refractory kneaded clay obtained by mixing a predetermined amount of water with a composition for refractory contained in an amount of 0.04 parts by weight or more with respect to parts by weight is poured into a desired furnace wall forming location. Then, heating and drying the refractory by heating the surface of the refractory thus constructed at a heating rate of 50 ° C. or more per hour and performing the heat treatment at least until the surface temperature of the refractory reaches 500 ° C. or more. A method for drying a furnace wall, characterized by: 9. The method of drying a furnace wall according to claim 8, wherein the temperature rising rate is 100 ° C. or more per hour. 10. The method of drying a furnace wall according to claim 7, wherein the temperature rising rate is 400 ° C. or less per hour. 11. The heat treatment according to claim 1, wherein the surface temperature of the refractory is 10 or less.
The method for drying a furnace wall according to claim 8, 9 or 10, wherein the method is performed until the temperature reaches 00 ° C or higher. 12. The aluminum-silicon alloy powder is contained in an amount of 0.04 to 3 parts by weight per 100 parts by weight of the total amount of the refractory aggregate and the refractory powder.
9, 10 or 11 oven wall drying methods. 13. The aluminum-silicon alloy powder contains 60 to 95% by weight of Al and 5 to 40% by weight of Si, the total amount of these is 90% by weight or more, and the particle size is 0.074 mm or less. The method for drying a furnace wall according to claim 8, 9, 10, 11 or 12, which comprises 40% by weight or more of particles. 14. The refractory powder contains alumina cement or clay.
2 or 13 oven wall drying method.