CN112624773B - Aluminum silicon carbide carbon brick and preparation method thereof - Google Patents

Aluminum silicon carbide carbon brick and preparation method thereof Download PDF

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CN112624773B
CN112624773B CN202011157931.4A CN202011157931A CN112624773B CN 112624773 B CN112624773 B CN 112624773B CN 202011157931 A CN202011157931 A CN 202011157931A CN 112624773 B CN112624773 B CN 112624773B
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bauxite
silicon carbide
aluminum
parts
grain
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CN112624773A (en
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李金松
李金旺
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Zhengzhou Jintai Technology Special Refractory Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/38—Non-oxide ceramic constituents or additives
    • C04B2235/3817—Carbides
    • C04B2235/3826—Silicon carbides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
    • C04B2235/422—Carbon
    • C04B2235/425—Graphite

Abstract

The application relates to the technical field of refractory materials, and particularly discloses an aluminum silicon carbide carbon brick and a preparation method thereof. The aluminum silicon carbide carbon brick is prepared from the following raw materials in parts by weight: 75-85 parts of an aluminum-containing aggregate, 5-10 parts of silicon carbide, 5-8 parts of graphite and 3-5 parts of a bonding agent, wherein the aluminum-containing aggregate comprises bauxite, the bauxite comprises coarse-grain bauxite, medium-grain bauxite and fine-grain bauxite, and the grain diameters of the coarse-grain bauxite, the medium-grain bauxite and the fine-grain bauxite are respectively 3-5mm, 1-3mm and 0-1mm according to a weight ratio of 15-20. The aluminum silicon carbide carbon brick has the advantages of excellent mechanical property, good high-temperature stability and long service life.

Description

Aluminum silicon carbide carbon brick and preparation method thereof
Technical Field
The application relates to the technical field of refractory materials, in particular to an aluminum silicon carbide carbon brick and a preparation method thereof.
Background
Refractory bricks are a common form of refractory material and can be used in many fields, such as steel production. The iron and steel united enterprises need transport the molten iron splendid attire when producing, because the molten iron temperature is high, when the transport distance is longer, all has very high requirement to the security and the durability of the torpedo ladle of splendid attire molten iron. The performance of the working layer material of the torpedo tank determines the safety and the service life of the tank body, the working layer is generally built by refractory bricks, the working layer needs to be directly contacted with molten iron, and the refractory bricks are required to have the characteristics of convenient building, stable structure and the like, and also need to be resistant to scouring and erosion, and have good pressure resistance and thermal shock stability.
The Chinese invention patent application with the application publication number of CN101851106A discloses an oxidation-resistant aluminum unburned carbon brick, which is prepared from the following raw materials in percentage by weight: 15-50% of 3mm-1mm brown corundum, 10-20% of 1mm-0mm brown corundum, 0-10% of 325-mesh brown corundum, 0-15% of 100-mesh brown corundum, 0-15% of 3mm-1mm fused magnesia, 0-10% of 1mm-0mm fused magnesia, 0-25% of 3mm-1mm alumina, 1-5% of aluminum powder, 5-15% of graphite, 0-5% of silicon carbide powder, 3-8% of ferrosilicon nitride, 0-1% of asphalt and 2-4% of phenolic resin.
In view of the above-mentioned related technologies, the inventors believe that the raw material of the carbon brick is added with a large amount of brown corundum, the amount of alumina is relatively small, and the particle size of alumina is relatively single, which easily causes a large volume change of the carbon brick at high temperature.
Disclosure of Invention
In order to reduce the volume change of the carbon brick at high temperature, the application provides an aluminum silicon carbide carbon brick and a preparation method thereof.
In a first aspect, the application provides an aluminum silicon carbide carbon brick, which adopts the following technical scheme:
an aluminum silicon carbide carbon brick is prepared from the following raw materials in parts by weight: 75-85 parts of aluminum-containing aggregate, 5-10 parts of silicon carbide, 5-8 parts of graphite and 3-5 parts of a bonding agent, wherein the aluminum-containing aggregate comprises bauxite, the bauxite comprises 15-20 parts of coarse-grain bauxite, medium-grain bauxite and fine-grain bauxite according to the weight ratio of (15-20).
Through adopting above-mentioned technical scheme, more aluminiferous aggregate has been added in the raw materials of aluminium carborundum carbon brick of this application, can improve bauxite's content in the raw materials, and then improved the content of silicon phase in the carbon brick that finally makes to promote carbon brick's high temperature stability, reduce the volume change of carbon brick under high temperature. The bauxite in the aluminum-containing aggregate is formed by matching coarse-grained bauxite, medium-grained bauxite and fine-grained bauxite, so that the distribution uniformity of the bauxite in the carbon brick can be improved, the carbon brick can form a compact structure, and the mechanical property of the carbon brick can be improved.
Preferably, the aluminum silicon carbide carbon brick is mainly prepared from the following raw materials in parts by weight: 82-85 parts of aluminum-containing aggregate, 8-10 parts of silicon carbide, 6-8 parts of graphite and 4.5-5 parts of a binding agent, wherein the aluminum-containing aggregate comprises bauxite, the bauxite comprises coarse bauxite, medium bauxite and fine bauxite according to a weight ratio of 20.
By adopting the technical scheme, the proportion of the raw materials is optimized, so that the raw materials can better act synergistically, the relative proportion of the aluminum-containing aggregate is improved, and the high-temperature stability of the carbon brick is further enhanced.
Preferably, the coarse-grained bauxite comprises 5-8% by weight of high-grade coarse-grained bauxite and 5-12% by weight of low-grade coarse-grained bauxite, the medium-grained bauxite comprises 30-35% by weight of high-grade medium-grained bauxite and 15-25% by weight of low-grade medium-grained bauxite, the fine-grained bauxite comprises 15-20% by weight of high-grade fine-grained bauxite and low-grade fine-grained bauxite, the mass fraction of alumina in the high-grade coarse-grained bauxite, the high-grade medium-grained bauxite and the high-grade fine-grained bauxite is 75-83%, and the mass fraction of alumina in the low-grade coarse-grained bauxite, the low-grade medium-grained bauxite and the low-grade fine-grained bauxite is 60-68%.
By adopting the technical scheme, the coarse-grained bauxite, the medium-grained bauxite and the fine-grained bauxite are formed by matching high-grade bauxite and low-grade bauxite, and after the high-grade bauxite and the low-grade bauxite are mixed, the content of alumina in the high-grade bauxite is moderate, so that the preparation requirement of a carbon brick is met, low-grade bauxite slag generated in the process of mining bauxite ore can be fully utilized, the production cost is reduced, and the environmental pollution caused by the fact that the low-grade bauxite cannot be utilized is also reduced.
Preferably, the raw materials also comprise 10-12 parts by weight of aluminate cement, 8-10 parts by weight of metakaolin and 3-5 parts by weight of brown corundum.
By adopting the technical scheme, the brown corundum is added into the raw materials, so that the slag resistance and the thermal shock stability of the carbon brick can be improved, and the binding force of the brown corundum and other raw materials can be improved by adding the aluminate cement and the metakaolin, so that a more compact carbon brick can be obtained. The addition of the metakaolin can also improve the strength of green bricks during the production of the carbon bricks, reduce the damage caused by external force in the transportation process of the green bricks and further improve the overall quality of the carbon bricks.
Preferably, the raw material also comprises 8-9 parts by weight of silicon nitride and 12-13 parts by weight of aluminum nitride.
By adopting the technical scheme, the thermal shock stability and the thermal shock resistance of the carbon brick can be further improved by adding the silicon nitride and the aluminum nitride, the chemical stability of the carbon brick can be greatly improved, and the service life of the carbon brick is further prolonged.
Preferably, the particle size of the silicon carbide is 200 meshes.
Through adopting above-mentioned technical scheme, because the addition of carborundum is less in the raw materials of the carbon brick of this application, adopt the carborundum that the particle size is very little, can make carborundum granule homodisperse in the clearance of other aggregate granules, form good support to other aggregates, further improve the mechanical properties of carbon brick.
In a second aspect, the present application provides a method for preparing an aluminum silicon carbide carbon brick, which adopts the following technical scheme:
the preparation method of the aluminum silicon carbide carbon brick comprises the following steps:
1) Uniformly mixing the aluminum-containing aggregate with a binding agent to prepare a premix;
2) Uniformly mixing the premix with silicon carbide and graphite to obtain a mixture;
3) Adding the mixture into a mold, and performing compression molding to obtain a green brick;
4) Sintering the green brick at 180-220 deg.C for 20-30h, and cooling.
By adopting the technical scheme, the aluminum-containing aggregate and the binding agent are uniformly mixed firstly, so that the surface of aluminum-containing aggregate particles is coated with a layer of the binding agent, and then when the aluminum-containing aggregate particles are mixed with silicon carbide and graphite, the silicon carbide and the graphite are bonded on the binding agent layer on the surface of the aluminum-containing aggregate particles, and further a silicon carbide layer and a graphite layer are coated on the surface of the aluminum-containing aggregate particles, so that the heat transfer among the aggregate particles in the carbon brick is more efficient, the temperature gradient in the carbon brick is reduced, the stress concentration in the carbon brick is also reduced by coating the silicon carbide layer, and the probability of cracks in the carbon brick is reduced.
Preferably, in the step 1), the coarse bauxite, the medium bauxite and the fine bauxite are mixed and ground for 3-5min to obtain the aluminum-containing aggregate, and then the aluminum-containing aggregate is uniformly mixed with the binding agent.
By adopting the technical scheme, the coarse bauxite, the medium bauxite and the fine bauxite are mixed and ground firstly, so that the bauxite with different particle sizes can be mixed in a graded manner and dispersed uniformly, and the gap between large-particle aggregates is reduced and is more uniform.
Preferably, the step of uniformly mixing the aluminum-containing aggregate and the binding agent is to mix and grind the aluminum-containing aggregate and the binding agent for 5 to 10 minutes.
By adopting the technical scheme, when the aluminum-containing aggregate is mixed with the binding agent, as the binding agent generally adopts liquid resin, and the liquid resin and the binding agent are mixed and ground for a long time, the binding agent can be promoted to form a more uniform binding agent coating layer on the surface of each aluminum-containing aggregate particle as far as possible.
Preferably, the premix is uniformly mixed with the silicon carbide and the graphite by uniformly mixing the premix with the silicon carbide and then uniformly mixing the premix with the graphite.
By adopting the technical scheme, the premix and the silicon carbide are uniformly mixed and then are uniformly mixed with the graphite, so that the silicon carbide is firstly attached to the binding agent on the surface of the aggregate particles in the premix, and then a layer of graphite is coated to enable the formed graphite layer to be positioned outside the particles, the graphite layer is more sufficient in contact with other raw materials, and the heat transfer efficiency between the aggregate particles and other raw materials is promoted.
In summary, the present application has the following beneficial effects:
1. the application adds a large amount of aluminum-containing aggregate into the raw materials of the aluminum silicon carbide carbon brick, improves the content of bauxite in the aluminum-containing aggregate, promotes the high-temperature stability of the carbon brick, and reduces the volume change of the carbon brick at high temperature. The bauxite is formed by mixing coarse-grained bauxite, medium-grained bauxite and fine-grained bauxite, so that the compactness of the carbon brick is improved, the mechanical property of the carbon brick is further improved, and the carbon brick with high breaking strength and compressive strength is obtained.
2. Bauxite in the raw materials of the aluminum silicon carbide carbon brick is formed by mixing high-grade bauxite and low-grade bauxite, so that the production cost is reduced, the low-grade bauxite can be fully utilized, and the environmental pollution is reduced.
Detailed Description
The present application will be described in further detail with reference to examples.
In the following examples, the aluminate cement is SeCAR 71 aluminate cement manufactured by Kannos aluminate technologies, inc.
The brown corundum is produced by Zhengzhou Peng soaring metallurgy Limited company, and the packaging specification is 1000kg per bag.
The alumina is produced by Luoyang Xiangjiang Wanji aluminum industry Co Ltd, and the packaging specification is 150kg per bag.
The silicon carbide adopts silicon carbide powder produced by Tianzhutong silicon carbide Limited liability company, and the particle size of the silicon carbide powder is 200 meshes.
The steel fiber is heat-resistant steel fiber produced by Zhengzhou Jinchuan metallurgical materials Limited company, the model is 449, the length is 25-30 mm, and the packaging specification is 20kg per bag.
Further, the raw materials also comprise 15 parts by weight of recycled aluminum silicon carbide carbon brick aggregate. The recycled aluminum silicon carbide carbon brick aggregate is obtained by crushing and screening waste aluminum silicon carbide carbon bricks, and the particle size is 200 meshes. Further, the regenerated aluminum silicon carbide carbon brick is prepared by the method comprising the following steps: a) Adding waste aluminum silicon carbide carbon bricks into a jaw crusher for crushing, then screening, screening out particles with the particle size of less than 5mm, adding the particles into a pulverizer for grinding, then screening, and screening out particles with the particle size of 200 meshes as granules; b) Adding the granules prepared in the step a) into waste hydrochloric acid with the mass fraction of HCl of 5%, soaking for 10min, performing solid-liquid separation, then adding into clear water, soaking for 2h, performing solid-liquid separation, and drying the solid at 100 ℃ to obtain the recycled aluminum silicon carbide carbon brick aggregate.
Further, the raw material also includes 5 parts by weight of zinc powder. The raw material also comprises 8 parts by weight of clay. The raw material also comprises 5 parts by weight of alumina. Further, the raw material also comprises 5 parts by weight of steel fiber.
The particle size of the brown corundum is 60 μm. The particle size of the metakaolin is 15 μm. The particle size of the zinc powder was 300. Mu.m. The particle size of the alumina is 1-3mm.
In the present application, the phrase "3 to 5mm" means that the undersize product is sieved with a 5mm sieve and the undersize product is sieved with a 3mm sieve, and the oversize product is taken out. The term "1-3mm" refers to that the undersize product is sieved by a 3mm sieve and then sieved by a 1mm sieve, and then the oversize product is taken out. "0-1mm" refers to the undersize obtained after sieving with a 1mm sieve.
The silicon nitride is silicon nitride powder with particle diameter of 20nm, purity of 99.9%, and specific surface area of 60m 2 G, apparent density of 0.1g/cm 3 . Or the silicon nitride is silicon nitride whisker with the specification of 100 × 800nm and the purity of 99.9%Specific surface area of 10m 2 G, apparent density of 1.2g/cm 3 。
The aluminum nitride is aluminum nitride powder with particle diameter of 50nm, purity of 99% and specific surface area of 105m 2 G, apparent density of 0.05g/cm 3 。
Preferably, the coarse-grained bauxite is formed by uniformly mixing high-grade coarse-grained bauxite and low-grade coarse-grained bauxite in a weight ratio of 5 to 12, wherein the mass fraction of alumina in the high-grade coarse-grained bauxite is 82%, and the mass fraction of alumina in the low-grade coarse-grained bauxite is 61%. The medium-grain bauxite is formed by uniformly mixing high-grade medium-grain bauxite and low-grade medium-grain bauxite in a weight ratio of 30 to 25, wherein the mass fraction of alumina in the high-grade medium-grain bauxite is 78%, and the mass fraction of alumina in the low-grade medium-grain bauxite is 62%. The fine-grain bauxite is formed by uniformly mixing 20% by weight of high-grade fine-grain bauxite and 65% by weight of low-grade fine-grain bauxite, wherein the mass fraction of alumina in the high-grade fine-grain bauxite is 76%, and the mass fraction of alumina in the low-grade fine-grain bauxite is 65%. In the bauxite of the present application, fe 2 O 3 Is not more than 1.6%, R 2 The mass fraction of O is not more than 0.4 percent, and the volume density of the bauxite is 3.1 to 3.4g/cm 3 The water absorption is less than or equal to 1.5 percent.
The binding agent is phenolic resin liquid, and the solid content is 75%.
In the preparation method of the aluminum silicon carbide carbon brick, the step of uniformly mixing the aluminum-containing aggregate and the binding agent is to mix and grind the aluminum-containing aggregate and the binding agent for 5-10min. Preferably, the premix is uniformly mixed with the graphite and the silicon carbide by uniformly mixing the premix and the silicon carbide and then uniformly mixing the premix and the graphite.
And 2) uniformly mixing the premix and the silicon carbide, namely mixing and grinding the premix and the silicon carbide for 10-15min. Adding graphite, and mixing for 5-10min.
Ageing the mixture before adding the mixture into a mould, wherein ageing is carried out by standing for 3-5 days under the conditions that the temperature is 20 ℃ and the humidity is 50%. And 3) after the mixture is added into a die, performing compression molding by using 800t of pressure, and then performing compression molding by using 1000t of pressure. And 6-7 times of beating with 800t of pressure when pressing with 800t of pressure. And when the pressing is carried out by adopting 1000t of pressure, the striking is carried out for 12-15 times by adopting 1000t of pressure.
Examples
Example 1
The aluminum silicon carbide carbon brick of the embodiment is prepared from the following raw materials by weight: 75.0kg of aluminum-containing aggregate, 5.0kg of silicon carbide, 5.0kg of graphite and 3.0kg of binding agent.
Wherein the aluminum-containing aggregate is bauxite particles, the bauxite particles are obtained by mixing coarse-grained bauxite, medium-grained bauxite and fine-grained bauxite according to a weight ratio of 15 to 45, the grain size of the coarse-grained bauxite is 3-5mm, the grain size of the medium-grained bauxite is 1-3mm, and the grain size of the fine-grained bauxite is 0-1mm. The particle size of the silicon carbide is 200 meshes. The graphite is flake graphite. The binding agent is phenolic resin liquid, and the solid content is 75%.
The preparation method of the aluminum silicon carbide carbon brick comprises the following steps:
1) Adding the coarse-grained bauxite, the medium-grained bauxite and the fine-grained bauxite into a mixing mill, mixing and milling for 3min to obtain an aluminum-containing aggregate, then adding a binding agent, and mixing and milling for 5min to obtain a premix;
2) Adding silicon carbide into the premix, mixing and grinding for 10min, then adding graphite, mixing and grinding for 5min to prepare a mixture;
3) Standing the mixture for 3d at 20 deg.C and 50% humidity for ageing;
4) Adding the mixed material after ageing into a mould, beating for 6 times by using 800t of pressure, then beating for 12 times by using 1000t of pressure to complete compression molding, and demoulding to obtain a green brick;
5) And transferring the green bricks into a kiln, sintering at 180 ℃ for 30h, and cooling to room temperature to obtain the finished product.
Example 2
The aluminum silicon carbide carbon brick of the embodiment is prepared from the following raw materials in parts by weight: 82.0kg of aluminum-containing aggregate, 8.0kg of silicon carbide, 6.0kg of graphite and 4.5kg of binding agent.
Wherein the aluminum-containing aggregate is bauxite particles, the bauxite particles are obtained by mixing coarse-grained bauxite, medium-grained bauxite and fine-grained bauxite according to a weight ratio of 20 to 55, the grain size of the coarse-grained bauxite is 3-5mm, the grain size of the medium-grained bauxite is 1-3mm, and the grain size of the fine-grained bauxite is 0-1mm. The particle size of the silicon carbide is 200 meshes. The graphite is flake graphite. The binding agent is phenolic resin liquid, and the solid content is 75%.
The preparation method of the aluminum silicon carbide carbon brick comprises the following steps:
1) Adding coarse-grained bauxite, medium-grained bauxite and fine-grained bauxite into a mixing mill, mixing and milling for 5min to obtain aluminum-containing aggregate, then adding a binding agent, and mixing and milling for 10min to obtain a premix;
2) Adding silicon carbide into the premix, mixing and grinding for 15min, then adding graphite, mixing and grinding for 10min, and preparing a mixture;
3) Standing the mixture for 4d at 20 deg.C and 50% humidity for ageing;
4) Adding the trapped mixture into a mould, beating for 7 times by using 800t of pressure, beating for 15 times by using 1000t of pressure to complete compression molding, and demoulding to obtain a green brick;
5) And transferring the green bricks into a kiln, sintering at 210 ℃ for 20h, and cooling to room temperature to obtain the finished product.
Example 3
The aluminum silicon carbide carbon brick of the embodiment is prepared from the following raw materials by weight: 85.0kg of aluminum-containing aggregate, 10.0kg of silicon carbide, 8.0kg of graphite and 5.0kg of binding agent.
Wherein the aluminum-containing aggregate is bauxite particles, the bauxite particles are obtained by mixing coarse-grained bauxite, medium-grained bauxite and fine-grained bauxite according to a weight ratio of 20 to 55, the grain size of the coarse-grained bauxite is 3-5mm, the grain size of the medium-grained bauxite is 1-3mm, and the grain size of the fine-grained bauxite is 0-1mm.
The coarse-grained bauxite is formed by uniformly mixing 5% by weight of high-grade coarse-grained bauxite and 12% by weight of low-grade coarse-grained bauxite, wherein the mass fraction of aluminum oxide in the high-grade coarse-grained bauxite is 82%, and the mass fraction of aluminum oxide in the low-grade coarse-grained bauxite is 61%. The medium-grain bauxite is formed by uniformly mixing high-grade medium-grain bauxite and low-grade medium-grain bauxite in a weight ratio of 30 to 25, wherein the mass fraction of alumina in the high-grade medium-grain bauxite is 78%, and the mass fraction of alumina in the low-grade medium-grain bauxite is 62%. The fine-grained bauxite is formed by uniformly mixing 20% by weight of high-grade fine-grained bauxite and 65% by weight of low-grade fine-grained bauxite, wherein the mass fraction of alumina in the high-grade fine-grained bauxite is 76%, and the mass fraction of alumina in the low-grade fine-grained bauxite is 65%.
The particle size of the silicon carbide is 200 meshes. The graphite is flake graphite. The binding agent is phenolic resin liquid, and the solid content is 75%.
The preparation method of the aluminum silicon carbide carbon brick comprises the following steps:
1) Adding coarse-grained bauxite, medium-grained bauxite and fine-grained bauxite into a mixing mill, mixing and milling for 4min to obtain an aluminum-containing aggregate, then adding a binding agent, and mixing and milling for 8min to obtain a premix;
2) Adding silicon carbide into the premix, mixing and grinding for 12min, then adding graphite, mixing and grinding for 8min, and preparing a mixture;
3) Standing the mixture for 5d at 20 deg.C and 50% humidity for ageing;
4) Adding the mixed material after ageing into a mould, beating for 6 times by using 800t of pressure, then beating for 15 times by using 1000t of pressure to complete compression molding, and demoulding to obtain a green brick;
5) And transferring the green bricks into a kiln, sintering at 200 ℃ for 24h, and cooling to room temperature to obtain the finished product.
Example 4
The aluminum silicon carbide carbon brick of the embodiment is prepared from the following raw materials in parts by weight: 82.0kg of aluminum-containing aggregate, 15.0kg of recycled aluminum silicon carbide carbon brick aggregate, 8.0kg of silicon carbide, 6.0kg of graphite and 4.5kg of binding agent.
Wherein, the recycled aluminum silicon carbide carbon brick aggregate is obtained by crushing and screening waste aluminum silicon carbide carbon bricks, and the particle size is 200 meshes. The other raw materials were the same as in example 3.
The preparation method of the aluminum silicon carbide carbon brick of the present example is different from the preparation method of example 3 in that the recycled aluminum silicon carbide carbon brick aggregate is added at the time of adding silicon carbide.
Example 5
The aluminum silicon carbide carbon brick of the embodiment is prepared from the following raw materials by weight: 82.0kg of aluminum-containing aggregate, 15.0kg of recycled aluminum silicon carbide carbon brick aggregate, 8.0kg of silicon carbide, 6.0kg of graphite, 4.5kg of binding agent, 11.0kg of aluminate cement, 9.0kg of metakaolin and 4.0kg of brown fused alumina.
Wherein the particle size of the metakaolin is 15 μm. The particle size of the brown corundum is 60 μm. The other raw materials were the same as in example 3.
The method for manufacturing the aluminum silicon carbide carbon brick of the present example is different from the method for manufacturing the aluminum silicon carbide carbon brick of the example 4 in that aluminate cement, metakaolin and brown alumina are added when silicon carbide is added.
Example 6
The aluminum silicon carbide carbon brick of the embodiment is prepared from the following raw materials by weight: 82.0kg of aluminum-containing aggregate, 15.0kg of recycled aluminum silicon carbide carbon brick aggregate, 8.0kg of silicon carbide, 6.0kg of graphite, 4.5kg of binding agent, 10.0kg of aluminate cement, 10.0kg of metakaolin and 5.0kg of brown corundum.
The specification of each raw material was the same as in example 5.
The preparation method of the aluminum silicon carbide carbon brick of the present example refers to the preparation method of example 5.
Example 7
The aluminum silicon carbide carbon brick of the embodiment is prepared from the following raw materials by weight: 82.0kg of aluminum-containing aggregate, 15.0kg of recycled aluminum silicon carbide carbon brick aggregate, 8.0kg of silicon carbide, 6.0kg of graphite, 4.5kg of binding agent, 12.0kg of aluminate cement, 8.0kg of metakaolin and 3.0kg of brown corundum.
The specification of each raw material was the same as in example 5.
The preparation method of the aluminum silicon carbide carbon brick of the present example refers to the preparation method of example 5.
Example 8
The aluminum silicon carbide carbon brick of the embodiment is prepared from the following raw materials in parts by weight: 82.0kg of aluminum-containing aggregate, 15.0kg of recycled aluminum silicon carbide carbon brick aggregate, 8.0kg of silicon carbide, 6.0kg of graphite, 4.5kg of binding agent, 10.0kg of aluminate cement, 10.0kg of metakaolin, 5.0kg of brown corundum, 9.0kg of silicon nitride and 12.0kg of aluminum nitride.
Wherein the silicon nitride is silicon nitride powder with particle diameter of 20nm, purity of 99.9%, and specific surface area of 60%m 2 G, apparent density of 0.1g/cm 3 . The aluminum nitride is aluminum nitride powder with particle diameter of 50nm, purity of 99% and specific surface area of 105m 2 G, apparent density of 0.05g/cm 3 . The specifications of the other raw materials were the same as in example 5.
The method for manufacturing an aluminum silicon carbide carbon brick of this example is different from the method for manufacturing the brick of example 5 in that silicon nitride and aluminum nitride are also added when silicon carbide is added.
Example 9
The aluminum silicon carbide carbon brick of the embodiment is prepared from the following raw materials by weight: 82.0kg of aluminum-containing aggregate, 15.0kg of recycled aluminum silicon carbide carbon brick aggregate, 8.0kg of silicon carbide, 6.0kg of graphite, 4.5kg of binding agent, 10.0kg of aluminate cement, 10.0kg of metakaolin, 5.0kg of brown corundum, 8.0kg of silicon nitride and 13.0kg of aluminum nitride.
Wherein the silicon nitride is silicon nitride whisker with specification of 100 × 800nm, purity of 99.9%, and specific surface area of 10m 2 G, apparent density of 1.2g/cm 3 . The specifications of the other raw materials were the same as in example 8.
The preparation method of the aluminum silicon carbide carbon brick of the present example refers to the preparation method of example 8.
Example 10
The aluminum silicon carbide carbon brick of the embodiment is prepared from the following raw materials by weight: 82.0kg of aluminum-containing aggregate, 15.0kg of recycled aluminum silicon carbide carbon brick aggregate, 8.0kg of silicon carbide, 6.0kg of graphite, 4.5kg of binding agent, 10.0kg of aluminate cement, 10.0kg of metakaolin, 5.0kg of brown corundum, 8.0kg of silicon nitride, 13.0kg of aluminum nitride and 5.0kg of zinc powder.
Wherein the grain diameter of the zinc powder is 300 mu m. The specifications of the other raw materials were the same as those of example 9.
The difference between the preparation method of the aluminum silicon carbide carbon brick of the embodiment and the embodiment 9 is that zinc powder is added when silicon carbide is added.
Example 11
The aluminum silicon carbide carbon brick of the embodiment is prepared from the following raw materials by weight: 82.0kg of aluminum-containing aggregate, 15.0kg of recycled aluminum silicon carbide carbon brick aggregate, 8.0kg of silicon carbide, 6.0kg of graphite, 4.5kg of binding agent, 10.0kg of aluminate cement, 10.0kg of metakaolin, 5.0kg of brown corundum, 8.0kg of silicon nitride, 13.0kg of aluminum nitride, 5.0kg of zinc powder, 8.0kg of clay, 5.0kg of alumina and 5.0kg of steel fiber.
Wherein the granularity of the clay is 200 meshes, and the granularity of the alumina is 1-3mm. The specifications of other raw materials were the same as those of example 10.
The method for preparing the aluminum silicon carbide carbon brick of the present example is different from example 10 in that alumina is further added when silicon carbide is added.
Comparative example
The raw material for producing a silicon carbide aluminum carbon brick of this comparative example is different from that of example 1 in that an aluminum-containing aggregate is obtained by mixing coarse-grained bauxite having a grain size of 1 to 3mm and fine-grained bauxite having a grain size of 0 to 1mm in a weight ratio of 15.
The method for preparing the aluminum silicon carbide carbon brick of this comparative example refers to example 1.
Performance test
The performance of the aluminum silicon carbide carbon bricks of examples 1-11 and comparative examples was tested according to the test method of standard YB/T165-2018, and the test results are shown in Table 1.
TABLE 1 comparison of the Properties of the aluminum silicon carbide carbon bricks of examples 1-11 and comparative examples
Figure RE-GDA0002941223660000091
According to the example 1 and the comparative example, and the combination of the table 1, the aluminum silicon carbide carbon brick has lower density, higher flexural strength and compressive strength, smaller heat receiving line change rate and excellent comprehensive performance.

Claims (1)

1. An aluminum silicon carbide carbon brick is characterized in that: the feed is prepared from the following raw materials in parts by weight: 82-85 parts of aluminum-containing aggregate, 8-10 parts of silicon carbide, 6-8 parts of graphite, 4.5-5 parts of binding agent, 10-12 parts of aluminate cement, 8-10 parts of metakaolin, 3-5 parts of brown corundum, 8-9 parts of silicon nitride, 12-13 parts of aluminum nitride, 5 parts of zinc powder, 8 parts of clay, 5 parts of alumina, 5 parts of steel fiber and 15 parts of recycled aluminum silicon carbide carbon brick aggregate; the aluminum-containing aggregate comprises bauxite, the bauxite is composed of coarse-grain bauxite, medium-grain bauxite and fine-grain bauxite according to a weight ratio of 20;
the coarse-grained bauxite is formed by uniformly mixing high-grade coarse-grained bauxite and low-grade coarse-grained bauxite in a weight ratio of 5 to 12, wherein the mass fraction of alumina in the high-grade coarse-grained bauxite is 82%, and the mass fraction of alumina in the low-grade coarse-grained bauxite is 61%; the medium-grain bauxite is formed by uniformly mixing high-grade medium-grain bauxite and low-grade medium-grain bauxite in a weight ratio of 30 to 25, wherein the mass fraction of alumina in the high-grade medium-grain bauxite is 78%, and the mass fraction of alumina in the low-grade medium-grain bauxite is 62%; the fine-grained bauxite is formed by uniformly mixing 20% by weight of high-grade fine-grained bauxite and 65% by weight of low-grade fine-grained bauxite, wherein the mass fraction of alumina in the high-grade fine-grained bauxite is 76%, and the mass fraction of alumina in the low-grade fine-grained bauxite is 65%; in bauxite, fe 2 O 3 Is not more than 1.6%, R 2 The mass fraction of O is not more than 0.4%, and the volume density of bauxite is 3.1-3.4g/cm 3 The water absorption rate is less than or equal to 1.5 percent;
the grain size of the silicon carbide is 200 meshes; the grain diameter of the brown corundum is 60 mu m; the particle size of the metakaolin is 15 mu m; the grain diameter of the zinc powder is 300 mu m; the granularity of the alumina is 1-3mm; the silicon nitride is silicon nitride powder with particle diameter of 20nm, purity of 99.9%, and specific surface area of 60m 2 G, apparent density of 0.1g/cm 3 (ii) a The aluminum nitride is aluminum nitride powder with particle diameter of 50nm, purity of 99% and specific surface area of 105m 2 G, apparent density of 0.05g/cm 3 ；
The recycled aluminum silicon carbide carbon brick aggregate is prepared by the method comprising the following steps: a) Adding waste aluminum silicon carbide carbon bricks into a jaw crusher for crushing, then screening, screening out particles with the particle size of less than 5mm, adding the particles into a pulverizer for grinding, then screening, and screening out particles with the particle size of 200 meshes as granules; b) Adding the granules prepared in the step a) into waste hydrochloric acid with the mass fraction of HCl of 5%, soaking for 10min, performing solid-liquid separation, then adding into clear water, soaking for 2h, performing solid-liquid separation, and drying the solid at 100 ℃ to obtain recycled aluminum silicon carbide carbon brick aggregate; the binding agent is phenolic resin liquid, and the solid content is 75%.
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