CN103242051A - Lightweight corundum-mullite castable and preparation method thereof - Google Patents
Lightweight corundum-mullite castable and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a lightweight corundum-mullite castable and a preparation method thereof. The the technical scheme is that the preparation method comprises the following raw materials of 40-70wt% of porous corundum-mullite ceramic particles, 10-25wt% of porous corundum-mullite ceramic fine powder, 10-20wt% of corundum fine powder, 1-3wt% of silicon oxide micro powder, 2-4wt% of active alpha aluminum oxide micro powder, 1-5wt% of calcium aluminate cement and 1-5wt% of rho aluminum oxide fine powder; water and a water reducing agent are taken as additives, wherein the weight of the water is 8-20wt% of that of the raw materials, and the weight of the water reducing agent is 0.02-1wt% of that of the raw materials; and the method comprises the steps of: evenly stirring, casting for molding, naturally drying a molded green body for 24h, and finally, drying the product for 8-48h at the temperature of 110 DEG C. The prepared product not only has the performances of high apparent porosity, high strength, low heat conductivity, high medium erosion resistance and the like, but also has the advantages of being convenient to construct, environment-friendly, controllable in apparent porosity and pore size, small in volume change after being burnt, and the like, thus being suitable for a working layer or a permanent layer of a high-temperature kiln or container with the working temperature lower than 1600 DEG C.
Description
Technical field
The invention belongs to the lightening casting material technical field.Be specifically related to a kind of lightweight corundum-mullite mould material and preparation method thereof.
Background technology
The corundum-mullite refractory materials has the refractoriness under load height, high temperature creep rate is low and thermal shock resistance can wait advantage well, is widely used in high temperature kiln or the container of iron work, glasswork etc.Tradition corundum-mullite refractory materials is aggregate with compact alumina or mullite, has higher heat conductivity, when it is applied to the working lining of high temperature kiln or container, can cause a large amount of calorific losss because the monolithic lining thermal conductivity is high.Since lagging material from hot side more close to, heat insulation effect more good (Li Nan etc., refractory materials learn, metallurgical industry press, 2010), therefore, the development work layer more is conducive to save energy with lightweight corundum-mullite refractory materials.
At present, about the more existing researchs of lightweight corundum-mullite material.Preparation (Yang Daoyuan etc. as the mullite-corundum light cinder brick, the preparation of high-strength low heat conductivity mullite-corundum light cinder brick, Rare Metals Materials and engineering, 2009,38(2): in document 1237-1240), be main raw material with alumine and silicon ash, be pore-forming material with the polystyrene spheres, made light-weight mullite-corundum material with gel injection technology, complicated process of preparation not only, can produce environmental pollution because polystyrene spheres burns in the manufacturing processed, and the strength of materials lower (2.17MPa), chemical purity is lower, the working lining that can not be used for high temperature kiln or container.And for example in the patented technology of " a kind of corundum-mullite light cinder brick and preparation method thereof (201110207949.5) ", be main raw material, be that the 1-3mm polystyrene spheres is that pore-forming material has made the corundum-mullite lightweight refractory with the granularity with the alumine fine powder, but this manufacturing process can produce environmental pollution equally, and the refractory materials chemical purity is lower, the aperture is bigger, is not suitable for working lining equally." although a kind of light porous aggregate alumina-silica refractory brick and preparation method thereof that contains " (200710052470.2) patented technology made have higher-strength, the lightweight corundum-mullite refractory materials of higher anti-erosion medium resistance ability, the working lining that can be used for high temperature kiln, but its goods belong to molded article, can not prepare baroque refractory materials, can not cast-in-place shaping.
Summary of the invention
The present invention is intended to overcome the prior art defective, purpose provides the preparation method of the simple lightweight corundum-mullite of a kind of preparation technology mould material, with the lightweight corundum-mullite mould material of this method preparation not only apparent porosity height, intensity height, thermal conductivity is low and anti-erosion medium resistance ability is strong, and apparent porosity and pore size is controlled, volume change is little after easy construction, environmental friendliness and the burning.
For achieving the above object, the technical solution used in the present invention is: with the porous corundum-mullite ceramic particle of 40 ~ 70wt%, the porous corundum-mullite pottery fine powder of 10 ~ 25wt%, the corundum fine powder of 10 ~ 20wt%, the ultrafine silica powder of 1 ~ 3wt%, the active alpha alumina powder of 2 ~ 4wt%, the ρ aluminum oxide fine powder of the aluminous cement of 1 ~ 5wt% and 1 ~ 5wt% is raw material, add the water of described raw material 8 ~ 20wt% and the water reducer of 0.02 ~ 1wt%, stir, casting, the seasoning 24 hours in air of base substrate after the moulding, under 110 ℃ of conditions dry 8 ~ 48 hours again.
Described porous corundum-mullite pottery is: with the colliery powder of 10 ~ 40wt% and 60 ~ 90% Al (OH)
3Powder is compound, adds the water of described compound 2 ~ 10wt% and the MgCO of 0.05 ~ 3wt%
3Powder stirs, moulding, and molding blank is following dry 4 ~ 24 hours at 110 ℃; Burning till under 1450 ~ 1600 ℃ of conditions or under 1600 ~ 1650 ℃ of conditions then, be incubated 1 ~ 8 hour, namely getting porous corundum-mullite pottery.
Porous corundum-mullite ceramic particle is, described porous corundum-mullite pottery is broken, screening, and the particle of choosing particle diameter and be 8 ~ 0.1mm is porous corundum-mullite ceramic particle; Porous corundum-mullite pottery fine powder is that described porous corundum-mullite pottery is pulverized screening; Choosing particle diameter is corundum-mullite pottery fine powder less than the fine powder of 88 μ m.
Described corundum fine powder is one or both in fused white corundum fine powder and the sintering plate corundum fine powder, and particle diameter is less than 88 μ m.
SiO in the described ultrafine silica powder
2Content is greater than 94wt%, and particle diameter is less than 3 μ m.
Al in the described active alpha alumina powder
2O
3Content is greater than 97wt%, and particle diameter is less than 3 μ m.
The particle diameter of described aluminous cement is less than 88 μ m.
Al in the described ρ aluminum oxide fine powder
2O
3Content is greater than 98wt%, and particle diameter is less than 88 μ m.
Described water reducer is more than one in tripoly phosphate sodium STPP, Sodium hexametaphosphate 99, dispersed aluminum oxide and the poly carboxylic acid series water reducer.
Adopt technique scheme, " a kind of porous mullite ceramic materials and preparation method thereof (CN 200610019552.2) " patented technology that the present invention adopts the applicant to apply for prepares porous corundum-mullite ceramic particle and porous corundum-mullite pottery fine powder, be porous aggregate, mainly be that matrix prepares lightening casting material with porous corundum-mullite pottery fine powder and corundum fine powder that with prepared porous corundum-mullite ceramic particle preparation technology is simple.Prepared product chemical ingredients mainly is Al
2O
3And SiO
2, its principal crystalline phase is corundum and mullite.In addition because porous corundum-mullite particle not only has higher void content and very little hole dimension, and porous corundum-mullite particle surface has micropore, strong with the matrix phase capacitive, at high temperature can between aggregate and matrix, form the mullite bridge joint behind the reaction in, so the existing high intensity of prepared material and heat-insulating property also have good anti-erosion medium resistance ability.
The lightweight corundum-mullite mould material of the present invention preparation is after testing: apparent porosity is 31 ~ 53%, and volume density is 2.25 ~ 1.58g/cm
3, folding strength is 1 ~ 8MPa; Burn till under 1450 ~ 1600 ℃ of conditions, soaking time is 3 ~ 8 hours, and after testing: apparent porosity is 33 ~ 55%, and volume density is 2.23 ~ 1.56g/cm
3, mean pore size is 3 ~ 15 μ m, folding strength is 3 ~ 16MPa.
Therefore, preparation technology of the present invention is simple, performance such as prepared lightweight corundum-mullite mould material had both had apparent porosity height, intensity height, thermal conductivity is low and anti-erosion medium resistance ability is strong, have advantages such as easy construction, environmental friendliness, apparent porosity and pore size are controlled, burning back volume change is little again, be applicable to that working temperature is lower than working lining or the permanent layer of 1600 ℃ high temperature kiln or container.
Embodiment
The invention will be further described below in conjunction with embodiment, is not the restriction to its protection domain:
For avoiding repetition, earlier the raw material unification in this embodiment is described below, repeat no more among the embodiment:
SiO in the ultrafine silica powder
2Content is greater than 94wt%, and particle diameter is less than 3 μ m; Al in the active alpha alumina powder
2O
3Content is greater than 97wt%, and particle diameter is less than 3 μ m; The particle diameter of aluminous cement is less than 88 μ m; Al in the ρ aluminum oxide fine powder
2O
3Content is greater than 98wt%, and particle diameter is less than 88 μ m.
Porous corundum-mullite pottery is: with the colliery powder of 10 ~ 40wt% and 60 ~ 90% Al (OH)
3Powder is compound, adds the water of described compound 2 ~ 10wt% and the MgCO of 0.05 ~ 3wt%
3Powder stirs, moulding, and molding blank is following dry 4 ~ 24 hours at 110 ℃; Burning till under 1450 ~ 1600 ℃ of conditions or under 1600 ~ 1650 ℃ of conditions then, be incubated 1 ~ 8 hour, namely getting porous corundum-mullite pottery.
Porous corundum-mullite ceramic particle is, described porous corundum-mullite pottery pulverized, and screening, the particle of choosing particle diameter and be 8 ~ 0.1mm is porous corundum-mullite ceramic particle; Porous corundum-mullite pottery fine powder is that described porous corundum-mullite pottery is pulverized screening; Choosing particle diameter is porous corundum-mullite pottery fine powder less than the fine powder of 88 μ m.
Embodiment 1
A kind of lightweight corundum-mullite mould material and preparation method thereof: be raw material with the porous corundum-mullite pottery fine powder of the porous corundum-mullite ceramic particle of 50 ~ 70wt%, 10 ~ 20wt%, the corundum fine powder of 10 ~ 15wt%, the ultrafine silica powder of 1 ~ 2wt%, the active alpha alumina powder of 3 ~ 4wt%, the aluminous cement of 1 ~ 4wt% and the ρ aluminum oxide fine powder of 3 ~ 5wt%, add the water of described raw material 8 ~ 12wt%, the tripoly phosphate sodium STPP of 0.1 ~ 0.3wt% and the Sodium hexametaphosphate 99 of 0.1 ~ 0.3wt%, stir casting; Base substrate seasoning after the moulding 24 hours, under 110 ℃ of conditions dry 8 ~ 18 hours again.
In the present embodiment: the grain composition ratio of porous corundum-mullite ceramic particle is: 8 ~ 5mm accounts for raw material 8 ~ 12wt%, and 5 ~ 3mm accounts for raw material 18 ~ 24wt%, and 3 ~ 1mm accounts for raw material 18 ~ 24wt%, and 1 ~ 0.1mm accounts for raw material 6 ~ 10wt%; Corundum fine powder is the fused white corundum fine powder, and particle diameter is less than 88 μ m.
The lightweight corundum-mullite mould material of present embodiment preparation, after testing: apparent porosity is 31 ~ 41%, volume density is 2.25 ~ 1.93g/cm
3, folding strength is 3 ~ 8MPa; Burn till under 1450 ~ 1600 ℃ of conditions, soaking time is 3 ~ 8 hours, and after testing: apparent porosity is 33 ~ 43%, and volume density is 2.23 ~ 1.91g/cm
3, mean pore size is 5 ~ 15 μ m, folding strength is 8 ~ 16MPa.
Embodiment 2
A kind of lightweight corundum-mullite mould material and preparation method thereof: be raw material with the porous corundum-mullite pottery fine powder of the porous corundum-mullite ceramic particle of 40 ~ 60wt%, 15 ~ 25wt%, the corundum fine powder of 15 ~ 20wt%, the ultrafine silica powder of 2 ~ 3wt%, the active alpha alumina powder of 2 ~ 3wt%, the aluminous cement of 3 ~ 5wt% and the ρ aluminum oxide fine powder of 2 ~ 4wt%, add the water of described raw material 12 ~ 16wt% and the tripoly phosphate sodium STPP of 0.02 ~ 0.4wt%, stir casting; Base substrate seasoning after the moulding 24 hours, under 110 ℃ of conditions dry 16 ~ 32 hours again.
In the present embodiment: the grain composition ratio of porous corundum-mullite ceramic particle is: 5 ~ 3mm accounts for raw material 15 ~ 22wt%, and 3 ~ 1mm accounts for raw material 15 ~ 22wt%, and 1 ~ 0.1mm accounts for raw material 10 ~ 16wt%; Corundum fine powder is the sintering plate corundum fine powder, and particle diameter is less than 88 μ m.
The lightweight corundum-mullite mould material of present embodiment preparation, after testing: apparent porosity is 39 ~ 47%, volume density is 2.00 ~ 1.82g/cm
3With folding strength be the lightweight corundum-mullite mould material of 2 ~ 4MPa; Burn till under 1450 ~ 1600 ℃ of conditions, soaking time is 3 ~ 8 hours, and after testing: apparent porosity is 41 ~ 49%, and volume density is 1.98 ~ 1.81g/cm
3, mean pore size is 3 ~ 12 μ m, folding strength is 4 ~ 9MPa.
Embodiment 3
A kind of lightweight corundum-mullite mould material and preparation method thereof: be raw material with the porous corundum-mullite pottery fine powder of the porous corundum-mullite ceramic particle of 40 ~ 70wt%, 10 ~ 25wt%, the corundum fine powder of 10 ~ 20wt%, the ultrafine silica powder of 2 ~ 3wt%, the active alpha alumina powder of 2 ~ 4wt%, the aluminous cement of 3 ~ 5wt% and the ρ aluminum oxide fine powder of 3 ~ 5wt%, add the water of described raw material 15 ~ 20wt% and the dispersed aluminum oxide of 0.5 ~ 1wt%, stir casting; Base substrate seasoning after the moulding 24 hours, under 110 ℃ of conditions dry 30 ~ 48 hours again.
In the present embodiment: the grain composition ratio of porous corundum-mullite ceramic particle is: 3 ~ 1mm accounts for raw material 15 ~ 30wt%, and 1 ~ 0.1mm accounts for raw material 25 ~ 40wt%; Consisting of of corundum fine powder: the fused white corundum fine powder accounts for raw material 6 ~ 9wt%, and the sintering plate corundum fine powder accounts for raw material 6 ~ 9wt%, and particle diameter is all less than 88 μ m.
The lightweight corundum-mullite mould material of present embodiment preparation, after testing: apparent porosity is 43 ~ 53%, volume density is 1.92 ~ 1.58g/cm
3, folding strength is 1 ~ 3MPa; Burn till under 1450 ~ 1600 ℃ of conditions, soaking time is 3 ~ 8 hours, and after testing: apparent porosity is 44 ~ 55%, and volume density is 1.92 ~ 1.56g/cm
3, mean pore size is 5 ~ 15 μ m, folding strength is 3 ~ 6MPa.
Embodiment 4
A kind of lightweight corundum-mullite mould material and preparation method thereof: be raw material with the porous corundum-mullite pottery fine powder of the porous corundum-mullite ceramic particle of 40 ~ 60wt%, 15 ~ 25wt%, the corundum fine powder of 15 ~ 20wt%, the ultrafine silica powder of 2 ~ 3wt%, the active alpha alumina powder of 2 ~ 3wt%, the aluminous cement of 3 ~ 5wt% and the ρ aluminum oxide fine powder of 1 ~ 5wt%, add the water of described raw material 13 ~ 17wt%., the dispersed aluminum oxide of 0.2 ~ 0.8wt% and the poly carboxylic acid series water reducer of 0.05 ~ 0.15wt%, stir casting; Base substrate seasoning after the moulding 24 hours, under 110 ℃ of conditions dry 16 ~ 32 hours again.
In the present embodiment: the grain composition ratio of porous corundum-mullite ceramic particle is: 5 ~ 3mm accounts for raw material 15 ~ 22wt%, and 3 ~ 1mm accounts for raw material 15 ~ 22wt%, and 1 ~ 0.1mm accounts for raw material 10 ~ 16wt%; Corundum fine powder is the fused white corundum fine powder, and particle diameter is less than 44 μ m.
The lightweight corundum-mullite mould material of present embodiment preparation, after testing: apparent porosity is 38 ~ 46%, volume density is 2.04 ~ 1.86g/cm
3, folding strength is 2 ~ 6MPa; Burn till under 1450 ~ 1600 ℃ of conditions, soaking time is 3 ~ 8 hours, and after testing: apparent porosity is 39 ~ 48%, and volume density is 2.03 ~ 1.85g/cm
3, mean pore size is 5 ~ 15 μ m, folding strength is 5 ~ 12MPa.
Embodiment 5
A kind of lightweight corundum-mullite mould material and preparation method thereof: be raw material with the porous corundum-mullite pottery fine powder of the porous corundum-mullite ceramic particle of 50 ~ 70wt%, 10 ~ 20wt%, the corundum fine powder of 10 ~ 15wt%, the ultrafine silica powder of 1 ~ 2wt%, the active alpha alumina powder of 3 ~ 4wt%, the aluminous cement of 1 ~ 5wt% and the ρ aluminum oxide fine powder of 3 ~ 5wt%, add the water of above-mentioned raw materials 13 ~ 18wt%, the tripoly phosphate sodium STPP of 0.1 ~ 0.3wt%, the Sodium hexametaphosphate 99 of 0.1 ~ 0.3wt% and the poly carboxylic acid series water reducer of 0.1 ~ 0.3wt%, stir casting; Base substrate seasoning after the moulding 24 hours, under 110 ℃ of conditions dry 16 ~ 32 hours again.
In the present embodiment: the grain composition ratio of porous corundum-mullite ceramic particle is: 8 ~ 5mm accounts for raw material 8 ~ 12wt%, and 5 ~ 3mm accounts for raw material 18 ~ 24wt%, and 3 ~ 1mm accounts for raw material 18 ~ 24wt%, and 1 ~ 0.1mm accounts for raw material 6 ~ 10wt%; Consisting of of corundum fine powder: particle diameter accounts for raw material 4 ~ 6wt% less than the fused white corundum fine powder of 44 μ m, and particle diameter accounts for raw material 6 ~ 9wt% less than the sintering plate corundum fine powder of 88 μ m.
The lightweight corundum-mullite mould material of present embodiment preparation, after testing: apparent porosity is 39 ~ 47%, volume density is 2.03 ~ 1.85g/cm
3, folding strength is 1 ~ 4MPa; Burn till under 1450 ~ 1600 ℃ of conditions, soaking time is 3 ~ 8 hours, and after testing: apparent porosity is 40 ~ 48%, and volume density is 2.02 ~ 1.84g/cm
3, mean pore size is 5 ~ 15 μ m, folding strength is 4 ~ 9MPa.
Embodiment 6
A kind of lightweight corundum-mullite mould material and preparation method thereof: with the porous corundum-mullite ceramic particle of 40 ~ 70wt%, the porous corundum-mullite pottery fine powder of 10 ~ 25wt%, the corundum fine powder of 10 ~ 20wt%, the ultrafine silica powder of 2 ~ 3wt%, the active alpha alumina powder of 2 ~ 4wt%, the ρ aluminum oxide fine powder of the aluminous cement of 3 ~ 5wt% and 3 ~ 5wt% is raw material, add the water of described raw material 8 ~ 13wt%, 0.3 the dispersed aluminum oxide of ~ 0.5wt%, 0.1 the tripoly phosphate sodium STPP of ~ 0.2wt%, 0.1 the Sodium hexametaphosphate 99 of ~ 0.2wt% and the poly carboxylic acid series water reducer of 0.05 ~ 0.15wt%, stir casting; Base substrate seasoning after the moulding 24 hours, under 110 ℃ of conditions dry 10 ~ 20 hours again.
In the present embodiment: the grain composition ratio of porous corundum-mullite ceramic particle is: 3 ~ 1mm accounts for raw material 15 ~ 30wt%, and 1 ~ 0.1mm accounts for raw material 25 ~ 40wt%; Corundum fine powder is the sintering plate corundum fine powder, and particle diameter is less than 88 μ m.
The lightweight corundum-mullite mould material of present embodiment preparation, after testing: apparent porosity is 34 ~ 42%, volume density is 2.11 ~ 1.91g/cm
3, folding strength is 4 ~ 8MPa; Burn till under 1450 ~ 1600 ℃ of conditions, soaking time is 3 ~ 8 hours, and after testing: apparent porosity is 36 ~ 44%, and volume density is 2.10 ~ 1.90g/cm
3, mean pore size is 5 ~ 15 μ m, folding strength is 6 ~ 15MPa.
This embodiment adopts " a kind of porous mullite ceramic materials and preparation method thereof (CN 200610019552.2) " patented technology of applicant's application to prepare porous corundum-mullite ceramic particle and porous corundum-mullite pottery fine powder, be porous aggregate, mainly be that matrix prepares lightening casting material with corundum-mullite pottery fine powder and corundum fine powder that with prepared porous corundum-mullite ceramic particle preparation technology is simple.Prepared product chemical ingredients mainly is Al
2O
3And SiO
2, its principal crystalline phase is corundum and mullite.In addition because porous corundum-mullite particle not only has higher void content and very little hole dimension, and porous corundum-mullite particle surface has micropore, strong with the matrix phase capacitive, at high temperature can between aggregate and matrix, form the mullite bridge joint behind the reaction in, so the existing high intensity of prepared material and heat-insulating property also have good anti-erosion medium resistance ability.
The lightweight corundum-mullite mould material of this embodiment preparation is after testing: apparent porosity is 31 ~ 53%, and volume density is 2.25 ~ 1.58g/cm
3, folding strength is 1 ~ 8MPa; Burn till under 1450 ~ 1600 ℃ of conditions, soaking time is 3 ~ 8 hours, and after testing: apparent porosity is 33 ~ 55%, and volume density is 2.23 ~ 1.56g/cm
3, mean pore size is 3 ~ 15 μ m, folding strength is 3 ~ 16MPa.
Therefore, this embodiment preparation technology is simple, performance such as prepared lightweight corundum-mullite mould material had both had apparent porosity height, intensity height, thermal conductivity is low and anti-erosion medium resistance ability is strong, have advantages such as easy construction, environmental friendliness, apparent porosity and pore size are controlled, burning back volume change is little again, be applicable to that working temperature is lower than working lining or the permanent layer of 1600 ℃ high temperature kiln or container.
Claims (9)
1. the preparation method of a lightweight corundum-mullite mould material, it is characterized in that the porous corundum-mullite ceramic particle with 40 ~ 70wt%, the porous corundum-mullite pottery fine powder of 10 ~ 25wt%, the corundum fine powder of 10 ~ 20wt%, the ultrafine silica powder of 1 ~ 3wt%, the active alpha alumina powder of 2 ~ 4wt%, the ρ aluminum oxide fine powder of the aluminous cement of 1 ~ 5wt% and 1 ~ 5wt% is raw material, add the water of described raw material 8 ~ 20wt% and the water reducer of 0.02 ~ 1wt%, stir, casting, the seasoning 24 hours in air of base substrate after the moulding, under 110 ℃ of conditions dry 8 ~ 48 hours again.
2. the preparation method of lightweight corundum-mullite mould material according to claim 1 is characterized in that described porous corundum-mullite pottery is:
With the colliery powder of 10 ~ 40wt% and 60 ~ 90% Al (OH)
3Powder is compound, adds the water of described compound 2 ~ 10wt% and the MgCO of 0.05 ~ 3wt%
3Powder stirs, moulding, and molding blank is following dry 4 ~ 24 hours at 110 ℃; Burning till under 1450 ~ 1600 ℃ of conditions or under 1600 ~ 1650 ℃ of conditions then, be incubated 1 ~ 8 hour, namely getting porous corundum-mullite pottery;
Porous corundum-mullite ceramic particle is, described porous corundum-mullite pottery is broken, screening, and the particle of choosing particle diameter and be 8 ~ 0.1mm is porous corundum-mullite ceramic particle;
Porous corundum-mullite pottery fine powder is that described porous corundum-mullite pottery is pulverized screening; Choosing particle diameter is porous corundum-mullite pottery fine powder less than the fine powder of 88 μ m.
3. the preparation method of lightweight corundum-mullite mould material according to claim 1 is characterized in that described corundum fine powder is one or both in fused white corundum fine powder and the sintering plate corundum fine powder, and particle diameter is less than 88 μ m.
4. the preparation method of lightweight corundum-mullite mould material according to claim 1 is characterized in that the SiO in the described ultrafine silica powder
2Content is greater than 94wt%, and particle diameter is less than 3 μ m.
5. the preparation method of lightweight corundum-mullite mould material according to claim 1 is characterized in that the Al in the described active alpha alumina powder
2O
3Content is greater than 97wt%, and particle diameter is less than 3 μ m.
6. the preparation method of lightweight corundum-mullite mould material according to claim 1 is characterized in that the particle diameter of described aluminous cement is less than 88 μ m.
7. the preparation method of lightweight corundum-mullite mould material according to claim 1 is characterized in that the Al in the described ρ aluminum oxide fine powder
2O
3Content is greater than 98wt%, and particle diameter is less than 88 μ m.
8. the preparation method of lightweight corundum-mullite mould material according to claim 1 is characterized in that described water reducer is more than one in tripoly phosphate sodium STPP, Sodium hexametaphosphate 99, dispersed aluminum oxide and the poly carboxylic acid series water reducer.
9. one kind lightweight corundum-mullite mould material is characterized in that described mould material is the prepared lightweight corundum-mullite mould material of preparation method according to each described lightweight corundum-mullite mould material in the claim 1 ~ 8.
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| CN111892387A (en) * | 2020-08-11 | 2020-11-06 | 中钢南京环境工程技术研究院有限公司 | Preparation method of large-size thin high-temperature corundum-mullite slab |
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