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CN114249599A - High-strength high-thermal-shock ultralow-heat-conduction corundum-mullite light furnace cover brick - Google Patents

High-strength high-thermal-shock ultralow-heat-conduction corundum-mullite light furnace cover brick Download PDF

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CN114249599A
CN114249599A CN202111643648.7A CN202111643648A CN114249599A CN 114249599 A CN114249599 A CN 114249599A CN 202111643648 A CN202111643648 A CN 202111643648A CN 114249599 A CN114249599 A CN 114249599A
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parts
corundum
powder
mullite
alumina
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翟剑
翟娟
沈富军
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Jiangsu Baoshi Heatproof Technology Development Co ltd
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Jiangsu Baoshi Heatproof Technology Development Co ltd
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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    • 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
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
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    • 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
    • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3427—Silicates other than clay, e.g. water glass
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    • C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
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Abstract

The invention discloses a high-strength high-thermal-shock ultralow-heat-conduction corundum-mullite light furnace cover brick, which relates to the technical field of bricks, and aims to solve the problems that the existing corundum-mullite light furnace cover brick is not reasonable enough in ingredients, low in product strength, high in heat conduction, easy to hurt people in the using process, short in service life, easy to cause unnecessary economic loss and poor in using effect, the following scheme is proposed, and comprises the following raw materials in parts by weight: 50-55 parts of special-grade high-alumina bauxite particle material, 5-10 parts of fused corundum particle material, 10-15 parts of synthetic mullite powder, 5-10 parts of alumina powder, 3-5 parts of ferric oxide, 1-3 parts of silica micropowder, 1-2 parts of sodium hexametaphosphate and 3-5 parts of combined clay. The invention has reasonable design, improves the strength and the thermal vibration and reduces the thermal conductivity by adding proper amount of aluminum oxide and ferric oxide, has wide raw materials and low price, effectively reduces the production cost, prolongs the service life and is suitable for popularization and use.

Description

High-strength high-thermal-shock ultralow-heat-conduction corundum-mullite light furnace cover brick
Technical Field
The invention relates to the technical field of bricks, in particular to a high-strength high-thermal-shock ultralow-thermal-conductivity corundum-mullite light furnace cover brick.
Background
Corundum-mullite brick (corundium-mullite brick) refers to a high-alumina refractory product consisting of corundum and mullite main crystal phases, and the corundum-mullite brick refers to a refractory product made of high-purity or purer raw materials. Wherein the presence of low melting point oxide impurities reduces the high temperature performance thereof. The pure mullite raw material synthesized by using industrial alumina powder and pure clay, bauxite or silica as raw materials is adopted, and the content of alkali metal oxide is particularly required to be as low as possible. The product prepared by taking the mullite cis-granule as the aggregate has good thermal shock resistance but poorer erosion resistance, and the product taking the corundum as the aggregate has good corrosion resistance but poorer thermal shock resistance. Therefore, a corundum-mullite light furnace cover brick with high strength, high thermal shock and ultralow heat conductivity is needed.
However, the existing corundum-mullite light furnace cover brick has the disadvantages of unreasonable material proportioning, low product strength, high thermal conductivity, easy injury to people in the using process, short service life, easy occurrence of unnecessary economic loss and poor using effect.
Disclosure of Invention
The invention aims to solve the defects that the existing corundum-mullite light furnace cover brick is not reasonable enough in ingredients, low in product strength, high in heat conductivity, easy to hurt people in the using process, short in service life, easy to cause unnecessary economic loss and poor in using effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
the formula of the high-strength high-thermal-shock ultralow-heat-conductivity corundum-mullite light furnace cover brick comprises the following raw materials in parts by weight:
50-55 parts of special-grade high-alumina bauxite particle material, 5-10 parts of fused corundum particle material, 10-15 parts of synthetic mullite powder, 5-10 parts of alumina powder, 3-5 parts of ferric oxide, 1-3 parts of silica micropowder, 1-2 parts of sodium hexametaphosphate and 3-5 parts of combined clay, wherein the weight ratio of the sodium hexametaphosphate to the combined clay is 1: 2.5.
The formula of the high-strength high-thermal-shock ultralow-heat-conductivity corundum-mullite light furnace cover brick comprises the following raw materials in parts by weight: 50-55 parts of special-grade high-alumina bauxite particle material, 6-8 parts of fused corundum particle material, 10-13 parts of synthetic mullite powder, 8-12 parts of alumina powder, 6-10 parts of ferric oxide, 1-3 parts of silica micropowder, 1-2 parts of sodium hexametaphosphate and 2-4 parts of combined clay, wherein the weight ratio of the sodium hexametaphosphate to the combined clay is 1:2.
The corundum-mullite light furnace cover brick with high strength and high thermal shock and ultralow heat conductivity comprises the following raw materials in parts by weight in matching slurry ingredients:
2-5 parts of alumina powder, 50-55 parts of special-grade high-alumina bauxite particle material, 5-10 parts of fused corundum particle material and 10-15 parts of synthetic mullite powder.
The preparation method of the corundum-mullite light furnace cover brick with high strength and high thermal shock and ultralow heat conductivity comprises the following steps:
s1: preparing materials: sequentially taking high-bauxite particle materials, fused corundum particle materials, synthetic mullite powder, alumina powder, ferric oxide, silicon micropowder, sodium hexametaphosphate and combined clay for later use.
S2: grinding to prepare powder: putting the high bauxite particle material, the fused corundum particle material, the synthetic mullite powder, the alumina powder, the iron oxide, the silicon micropowder, the sodium hexametaphosphate and the combined clay raw material weighed in the S1 into a grinding machine for grinding and pulverizing to obtain powder for later use;
s3: preparing a molding mixture: and adding water into the high bauxite particle material, the fused corundum particle material, the synthetic mullite powder, the alumina powder, the iron oxide, the silicon micropowder, the sodium hexametaphosphate and the combined clay powder raw material weighed in the step S2 for mixing, and putting the mixture into a specific mold.
S4: and (3) calcining: and (4) putting the high-bauxite particle material, the fused corundum particle material, the synthetic mullite powder, the alumina powder, the iron oxide, the silicon micropowder, the sodium hexametaphosphate and the combined clay molding mixture weighed in the S3 into a high-temperature kiln for calcination molding.
Preferably, in S3, the temperature of calcination is stabilized at 1450 ℃.
Preferably, in S2, the powder needs to be sieved after grinding and milling, and the powder needs to pass through a sieve of 120-160 meshes.
Preferably, if the width of the cracks of the calcined product is more than one millimeter, the calcined product is regarded as a defective product, and the material blending index needs to be strictly screened.
The invention has reasonable design, improves the strength and the thermal vibration and reduces the thermal conductivity by adding proper amount of aluminum oxide and ferric oxide, has wide raw materials and low price, effectively reduces the production cost, prolongs the service life and is suitable for popularization and use.
Drawings
FIG. 1 is a schematic diagram of production ingredients and technical indexes of a high-strength high-thermal-shock ultra-low thermal conductivity corundum-mullite lightweight furnace cover brick provided by the invention;
FIG. 2 is a schematic diagram of the material ingredients and technical indexes of slurry matched with the high-strength high-thermal-shock ultralow-thermal-conductivity corundum-mullite lightweight furnace cover brick provided by the invention;
FIG. 3 is a schematic diagram of the appearance and allowable deviation standard of the high-strength high-thermal-shock ultra-low thermal conductivity corundum mullite lightweight furnace cover brick provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The first embodiment is as follows:
the invention provides a formula of a high-strength high-thermal-shock ultralow-heat-conductivity corundum-mullite light furnace cover brick, which comprises the following raw materials in parts by weight:
53 parts of special-grade high-alumina bauxite particle material, 7 parts of fused corundum particle material, 12 parts of synthetic mullite powder, 8 parts of alumina powder, 4 parts of ferric oxide, 2 parts of silicon micropowder, 1 part of sodium hexametaphosphate and 3 parts of combined clay, wherein the weight ratio of the sodium hexametaphosphate to the combined clay is 1: 2.0.
The preparation method of the formula for the high-strength high-thermal-shock ultralow-heat-conductivity corundum-mullite light furnace cover brick comprises the following steps of:
s1: preparing materials: sequentially taking high-bauxite particle materials, fused corundum particle materials, synthetic mullite powder, alumina powder, ferric oxide, silicon micropowder, sodium hexametaphosphate and combined clay for later use.
S2: grinding to prepare powder: putting the high bauxite particle material, the fused corundum particle material, the synthetic mullite powder, the alumina powder, the iron oxide, the silicon micropowder, the sodium hexametaphosphate and the combined clay raw material weighed in the S1 into a grinding machine for grinding and pulverizing to obtain powder for later use;
s3: preparing a molding mixture: and adding water into the high bauxite particle material, the fused corundum particle material, the synthetic mullite powder, the alumina powder, the iron oxide, the silicon micropowder, the sodium hexametaphosphate and the combined clay powder raw material weighed in the step S2 for mixing, and putting the mixture into a specific mold.
S4: and (3) calcining: and (4) putting the high-bauxite particle material, the fused corundum particle material, the synthetic mullite powder, the alumina powder, the iron oxide, the silicon micropowder, the sodium hexametaphosphate and the combined clay molding mixture weighed in the S3 into a high-temperature kiln for calcination molding.
In this embodiment, when the raw material is ground and powdered in S2, the powder needs to pass through a 120-mesh screen.
In the second embodiment
The invention provides a formula of a high-strength high-thermal-shock ultralow-heat-conductivity corundum-mullite light furnace cover brick, which comprises the following raw materials in parts by weight:
55 parts of special-grade high-alumina bauxite particle material, 8 parts of fused corundum particle material, 14 parts of synthetic mullite powder, 10 parts of alumina powder, 5 parts of ferric oxide, 3 parts of silicon micropowder, 2 parts of sodium hexametaphosphate and 4 parts of combined clay, wherein the weight ratio of the sodium hexametaphosphate to the combined clay is 1: 2.4.
The preparation method of the formula for the high-strength high-thermal-shock ultralow-heat-conductivity corundum-mullite light furnace cover brick comprises the following steps of:
s1: preparing materials: sequentially taking high-bauxite particle materials, fused corundum particle materials, synthetic mullite powder, alumina powder, ferric oxide, silicon micropowder, sodium hexametaphosphate and combined clay for later use.
S2: grinding to prepare powder: putting the high bauxite particle material, the fused corundum particle material, the synthetic mullite powder, the alumina powder, the iron oxide, the silicon micropowder, the sodium hexametaphosphate and the combined clay raw material weighed in the S1 into a grinding machine for grinding and pulverizing to obtain powder for later use;
s3: preparing a molding mixture: and adding water into the high bauxite particle material, the fused corundum particle material, the synthetic mullite powder, the alumina powder, the iron oxide, the silicon micropowder, the sodium hexametaphosphate and the combined clay powder raw material weighed in the step S2 for mixing, and putting the mixture into a specific mold.
S4: and (3) calcining: and (4) putting the high-bauxite particle material, the fused corundum particle material, the synthetic mullite powder, the alumina powder, the iron oxide, the silicon micropowder, the sodium hexametaphosphate and the combined clay molding mixture weighed in the S3 into a high-temperature kiln for calcination molding.
In this embodiment, when the raw material is ground and powdered in S2, the powder needs to pass through a 160-mesh screen.
Example three:
the invention provides a formula of a high-strength high-thermal-shock ultralow-heat-conductivity corundum-mullite light furnace cover brick, which comprises the following raw materials in parts by weight:
50 parts of special-grade high-alumina bauxite particles, 6 parts of fused corundum particles, 14 parts of synthetic mullite powder, 5 parts of alumina powder, 3 parts of ferric oxide, 1 part of silicon micropowder, 2 parts of sodium hexametaphosphate and 5 parts of combined clay, wherein the weight ratio of the sodium hexametaphosphate to the combined clay is 1: 2.2.
The preparation method of the formula for the high-strength high-thermal-shock ultralow-heat-conductivity corundum-mullite light furnace cover brick comprises the following steps of:
s1: preparing materials: sequentially taking high-bauxite particle materials, fused corundum particle materials, synthetic mullite powder, alumina powder, ferric oxide, silicon micropowder, sodium hexametaphosphate and combined clay for later use.
S2: grinding to prepare powder: putting the high bauxite particle material, the fused corundum particle material, the synthetic mullite powder, the alumina powder, the iron oxide, the silicon micropowder, the sodium hexametaphosphate and the combined clay raw material weighed in the S1 into a grinding machine for grinding and pulverizing to obtain powder for later use;
s3: preparing a molding mixture: and adding water into the high bauxite particle material, the fused corundum particle material, the synthetic mullite powder, the alumina powder, the iron oxide, the silicon micropowder, the sodium hexametaphosphate and the combined clay powder raw material weighed in the step S2 for mixing, and putting the mixture into a specific mold.
S4: and (3) calcining: and (4) putting the high-bauxite particle material, the fused corundum particle material, the synthetic mullite powder, the alumina powder, the iron oxide, the silicon micropowder, the sodium hexametaphosphate and the combined clay molding mixture weighed in the S3 into a high-temperature kiln for calcination molding.
In this embodiment, when the raw material is ground and powdered in S2, the powder needs to pass through a 140-mesh screen.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.

Claims (7)

1.高强度高热震超低导热刚玉莫来石轻质炉盖砖配方，其特征在于，包括以下重量份的原料：1. high-strength high thermal shock ultra-low thermal conductivity corundum mullite light furnace cover brick formula, is characterized in that, comprises the raw material of following weight portion: 特级高铝矾土颗粒料50～55份、电熔刚玉颗粒料5～10份、合成莫来石粉10～15份、氧化铝粉末5～10份、氧化铁3～5份、硅微粉1～3份、六偏磷酸钠1～2份与结合黏土3～5份，六偏磷酸钠与结合黏土的重量份之比为1:2.5。50-55 parts of super high alumina bauxite granules, 5-10 parts of fused corundum granules, 10-15 parts of synthetic mullite powder, 5-10 parts of alumina powder, 3-5 parts of iron oxide, 1- 3 parts, 1-2 parts of sodium hexametaphosphate and 3-5 parts of bound clay, and the weight ratio of sodium hexametaphosphate to bound clay is 1:2.5. 2.根据权利要求1的高强度高热震超低导热刚玉莫来石轻质炉盖砖配方，其特征在于，包括以下重量份的原料：特级高铝矾土颗粒料50～55份、电熔刚玉颗粒料6～8份、合成莫来石粉10～13份、氧化铝粉末8～12份、氧化铁6～10份、硅微粉1～3份、六偏磷酸钠1～2份与结合黏土2～4份，六偏磷酸钠与结合黏土的重量份之比为1:2。2. according to the high-strength high thermal shock ultra-low thermal conductivity corundum mullite light furnace cover brick formula of claim 1, it is characterized in that, comprise the raw material of following weight portion: 50～55 parts of super high alumina bauxite particles, electrofusion 6-8 parts of corundum granules, 10-13 parts of synthetic mullite powder, 8-12 parts of alumina powder, 6-10 parts of iron oxide, 1-3 parts of silicon micropowder, 1-2 parts of sodium hexametaphosphate and bound clay 2 to 4 parts, and the weight ratio of sodium hexametaphosphate to bound clay is 1:2. 3.根据权利要求1的高强度高热震超低导热刚玉莫来石轻质炉盖砖配方，其特征在于，配套泥浆配料包括以下重量份的原料：氧化铝粉末2～5份、特级高铝矾土颗粒料50～55份、电熔刚玉颗粒料5～10份与合成莫来石粉10～15份。3. according to the high-strength high thermal shock ultra-low thermal conductivity corundum mullite light furnace cover brick formula of claim 1, it is characterized in that, matching mud batching comprises the raw material of following parts by weight: alumina powder 2～5 parts, super high alumina 50-55 parts of alumina particles, 5-10 parts of fused corundum particles and 10-15 parts of synthetic mullite powder. 4.根据权利要求1～2的高强度高热震超低导热刚玉莫来石轻质炉盖砖的制备方法，其特征在于，包括以下步骤：4. according to the preparation method of the high-strength high thermal shock ultra-low thermal conductivity corundum mullite light furnace cover brick of claim 1～2, is characterized in that, comprises the following steps: S1：备料：依次取高铝矾土颗粒料、电熔刚玉颗粒料、合成莫来石粉、氧化铝粉末、氧化铁、硅微粉、六偏磷酸钠与结合黏土，备用。S1: Material preparation: take high alumina bauxite pellets, fused corundum pellets, synthetic mullite powder, alumina powder, iron oxide, silicon micropowder, sodium hexametaphosphate and bound clay in sequence, and set aside. S2：研磨制粉：将S1中称取的高铝矾土颗粒料、电熔刚玉颗粒料、合成莫来石粉、氧化铝粉末、氧化铁、硅微粉、六偏磷酸钠与结合黏土原料投放到研磨机中进行研磨制粉，得到粉末，备用；S2: Grinding and milling: put the high alumina bauxite particles, fused corundum particles, synthetic mullite powder, alumina powder, iron oxide, silicon micropowder, sodium hexametaphosphate and combined clay raw materials weighed in S1 into the Grinding and pulverizing in a grinder to obtain powder for use; S3：制备成型混合物：将S2中称取的高铝矾土颗粒料、电熔刚玉颗粒料、合成莫来石粉、氧化铝粉末、氧化铁、硅微粉、六偏磷酸钠与结合黏土粉末原料加入水混合，并将混合物放入特定的模具内。S3: Preparation of molding mixture: the high alumina bauxite granules, fused corundum granules, synthetic mullite powder, alumina powder, iron oxide, silicon micropowder, sodium hexametaphosphate and combined clay powder raw materials weighed in S2 are added The water is mixed and the mixture is placed in a specific mold. S4：煅烧：将S3中称取的高铝矾土颗粒料、电熔刚玉颗粒料、合成莫来石粉、氧化铝粉末、氧化铁、硅微粉、六偏磷酸钠与结合黏土成型混合料放入高温窑内进行煅烧成型。S4: calcination: put the high alumina bauxite particles, fused corundum particles, synthetic mullite powder, alumina powder, iron oxide, silicon micropowder, sodium hexametaphosphate and bonded clay molding mixture weighed in S3 into calcined in a high temperature kiln. 5.根据权利要求4的高强度高热震超低导热刚玉莫来石轻质炉盖砖，其特征在于：S3中，煅烧的温度稳定为1450℃。5. The high-strength, high-thermal-shock, and ultra-low thermal conductivity corundum-mullite light-weight furnace cover brick according to claim 4, characterized in that: in S3, the calcining temperature is stable at 1450°C. 6.根据权利要求1的高强度高热震超低导热刚玉莫来石轻质炉盖砖，其特征在于：S2中，研磨研磨制粉后需要过筛，粉料必须通过120～160目的筛网。6. The high-strength high thermal shock ultra-low thermal conductivity corundum mullite light furnace cover brick according to claim 1, characterized in that: in S2, after grinding and pulverizing, it needs to be sieved, and the powder must pass through a 120-160 mesh screen . 7.根据权利要求4的高强度高热震超低导热刚玉莫来石轻质炉盖砖，其特征在于：煅烧成品裂纹宽度大于一毫米则视为不合格品，则需要对配料指标进行严格筛选。7. according to the high-strength high thermal shock ultra-low thermal conductivity corundum mullite light furnace cover brick of claim 4, it is characterized in that: the crack width of the calcined finished product is greater than one millimeter and then regarded as a substandard product, then the batching index needs to be strictly screened .
CN202111643648.7A 2021-12-29 2021-12-29 High-strength high-thermal-shock ultralow-heat-conduction corundum-mullite light furnace cover brick Pending CN114249599A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116947472A (en) * 2023-07-19 2023-10-27 郑州纬通电熔新材料科技有限公司 Electric furnace cover raw material composition, furnace cover building block and masonry type electric furnace anhydrous cooling furnace cover

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116947472A (en) * 2023-07-19 2023-10-27 郑州纬通电熔新材料科技有限公司 Electric furnace cover raw material composition, furnace cover building block and masonry type electric furnace anhydrous cooling furnace cover

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