CN110668830A - Preparation method of novel mullite-combined light castable - Google Patents
Preparation method of novel mullite-combined light castable Download PDFInfo
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- CN110668830A CN110668830A CN201910913587.8A CN201910913587A CN110668830A CN 110668830 A CN110668830 A CN 110668830A CN 201910913587 A CN201910913587 A CN 201910913587A CN 110668830 A CN110668830 A CN 110668830A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 39
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 39
- 239000000843 powder Substances 0.000 claims abstract description 38
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 31
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 17
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 17
- 239000004927 clay Substances 0.000 claims abstract description 16
- 239000011159 matrix material Substances 0.000 claims abstract description 16
- 239000010431 corundum Substances 0.000 claims abstract description 14
- 239000004568 cement Substances 0.000 claims abstract description 13
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 13
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 13
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 13
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 13
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 13
- 229910052849 andalusite Inorganic materials 0.000 claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 11
- 239000010703 silicon Substances 0.000 claims abstract description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 150000004645 aluminates Chemical class 0.000 claims abstract description 10
- 238000009826 distribution Methods 0.000 claims abstract description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 3
- 239000011707 mineral Substances 0.000 claims abstract description 3
- 239000002245 particle Substances 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 6
- 239000004615 ingredient Substances 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000005245 sintering Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 11
- 239000010959 steel Substances 0.000 abstract description 11
- 230000035939 shock Effects 0.000 abstract description 8
- 239000011819 refractory material Substances 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 abstract 1
- 238000005266 casting Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
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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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
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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
- C04B2235/3418—Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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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
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
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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
- C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
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- C04B2235/77—Density
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
- C04B2235/9615—Linear firing shrinkage
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Abstract
The invention relates to the technical field of refractory materials, in particular to a preparation method of a novel mullite-bonded lightweight castable, which comprises aggregate and a matrix, and is characterized in that the aggregate is composed of 60 sintered mullite, 45 flint clay and 57 andalusite, the matrix is composed of 70 sintered mullite fine powder, white corundum fine powder, aluminate cement, 95 silicon micropowder and a small amount of alumina micropowder, and the proportion of Al2O3 and SiO2 in a matrix material distribution point is controlled to be 4.5-5.5, so that the matrix mineral phase composition is ensured to fall in a region where mullite phase and corundum phase are symbiotic. The castable has the advantages of small volume density, low thermal conductivity, high refractoriness (>1650 ℃), good thermal shock stability, high medium-high temperature strength and the like, can be used as heat-insulating covers for various metallurgy, and simultaneously uses a large amount of low-price 45 flint clay and 60 sintered mullite in the castable to delay the deformation rate of a steel structure, thereby bringing considerable economic benefit.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to a preparation method of a novel mullite-combined light castable.
Background
At present, in newly built large steel plants, ladle capping and tundish capping have become a development trend, and the method can effectively reduce the temperature drop of molten steel in a ladle and a tundish caused by heat radiation. According to statistics, the steel ladle capping can reduce the tapping temperature of the converter by about 10-20 ℃, can effectively reduce the addition amount of the covering agent on the surface of molten steel, and plays a positive role in energy conservation and consumption reduction of steel mills and pure steel smelting, so the steel ladle capping is paid more attention by all steel mills. Generally, the service temperature of refractory materials used for a ladle cover and a tundish cover is between 1300 ℃ and 1400 ℃, most of aluminum-silicon refractory materials can be applied in the temperature range, but the common aluminum-silicon refractory materials have the problems of large heat conductivity, low refractoriness, poor thermal shock stability and the like, so that the refractory materials on the ladle cover are prematurely fallen off; on the other hand, the steel structure on the ladle cover is seriously deformed, so that the cost for repairing the ladle cover is sharply increased. In order to solve the problem, the invention selects sintered mullite with better thermal shock stability as aggregate, the mixture ratio of matrix is carried out according to the proportion of alumina to silica being between 4.5 and 5.5, and cement and silica micropowder are used as binding agents to prepare the mullite-bonded low-density castable specially used for ladle covers and tundish covers.
Disclosure of Invention
The invention aims to provide a preparation method of a novel mullite-combined light castable, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the preparation method of the novel mullite-combined lightweight castable comprises aggregate and a substrate, wherein the aggregate is composed of 60-sintered mullite, 45-flint clay and 57-andalusite, and the substrate is composed of 70-sintered mullite fine powder, white corundum fine powder, aluminate cement, 95 silicon micropowder and a small amount of alumina micropowder.
Preferably, the grain size distribution of the 60 sintered mullite is 5-3, 3-1 and 1-0, the addition amount is 30-52 parts, and the addition amount of the 70 sintered mullite fine powder is 5-10 parts.
Preferably, the 45-flint clay aggregate has the particle size distribution of 5-3 and 3-1, and the addition amount of the 45-flint clay aggregate in the whole castable ingredients is 15-20 parts.
Preferably, the 57 andalusite has a particle size distribution of 3-1 and 1-0, and is added in an amount of 7-10 parts.
Preferably, the addition amount of the white corundum fine powder is 5-10 parts, the addition amount of the aluminate cement is 2-4 parts, the addition amount of the 95 silicon micro powder is 3-5 parts, and the addition amount of the alumina micro powder is 0-3 parts.
Preferably, the mineral phase in the matrix is mainly based on a corundum phase and a mullite phase.
Preferably, the content of Al2O3 in the 45-flint clay aggregate is more than or equal to 45 percent, the content of SiO2 is more than or equal to 50 percent, the size range of the particles is 5-1, the volume density of the particles is more than or equal to 2.43g/cm3, the apparent porosity is less than or equal to 7 percent, and the water absorption is less than or equal to 2.7 percent; the 60 mullite aggregate is prepared by a sintering method, wherein the content of Al2O3 is more than or equal to 62 percent, the content of SiO2 is more than or equal to 32 percent, the size range of particles is 5-0, the volume density is more than or equal to 2.70g/cm3, the apparent porosity is less than or equal to 1.5 percent, and the water absorption is less than or equal to 0.5 percent; the content of the 57 andalusite Al2O3 is more than or equal to 57 percent, the content of the SiO2 is more than or equal to 38 percent, the size range of the particles is 3-0, and the volume density of the particles is more than or equal to 3.1g/cm 3; the specification of the 70 sintered mullite fine powder is not more than 200 meshes, the content of Al2O3 is not less than 68%, the content of SiO2 is not more than 27%, and the sintered mullite fine powder is prepared by a sintering method; the content of Al2O3 in the white corundum fine powder is more than or equal to 99.3 percent, and the particle size is less than or equal to 76 mu m; the content of the 95 silicon micro powder SiO2 is more than or equal to 95 percent, the particle size is less than or equal to 3 mu m, the specification of the alumina micro powder is less than or equal to 5 mu m, and the content of Al2O3 is more than or equal to 99.2 percent; the specification of the calcium aluminate cement is less than or equal to 5 mu m, the content of Al2O3 is more than or equal to 68 percent, and the content of CaO is more than or equal to 27 percent.
Preferably, the method comprises the following steps:
s1, weighing 60 parts by weight of sintered mullite aggregate, 15-20 parts by weight of 57 flint clay aggregate and 5-10 parts by weight of andalusite aggregate, uniformly stirring to form aggregate of the low-density castable, and preparing the materials;
s2, weighing 70 parts by weight of sintered mullite fine powder 5-10 parts, white corundum fine powder 5-10 parts, aluminate cement 2-4 parts and silicon micro powder 2-4 parts, wherein the ratio of Al2O3 to SiO2 is controlled between 4.5-5.5, uniformly stirring to form a matrix, and preparing materials;
and S3, uniformly stirring and mixing the aggregate of the low-density castable formed in the S1 and the matrix formed in the S2, and packaging after mixing.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the prepared castable has low volume density which is between 2.45 and 2.50 after being baked at 110 ℃ for 24 hours and baked at 1650 ℃ for 3 hours, and the low-density castable is in the range close to the light refractory castable and takes aluminate cement and silica micropowder as a bonding agent at normal temperature and medium temperature; and at high temperature, a large amount of in-situ columnar mullite generated by alumina and silica is used as a binding phase, aggregate and a matrix are tightly connected together, and the refractoriness of the castable is increased, so that the matrix is properly proportioned, the aggregate is properly selected, and the castable has high refractoriness (>1650 ℃), and is completely suitable for the use environments of various heat-insulating covers.
2. In the invention, a large amount of 45-flint clay and 60-sintered mullite which are low in price are used in the castable, so that the castable is low in raw material cost; and because the volume density is lower, compared with the common casting material, the casting material has the advantages of less consumption and the like, the lower thermal conductivity and the excellent thermal shock stability enable the casting material to have longer service life, and can delay the deformation rate of a steel structure, thereby bringing considerable economic benefits.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with 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 embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
The invention provides a technical scheme that:
the preparation method of the novel mullite-combined lightweight castable comprises aggregate and a substrate, wherein the aggregate is composed of 60-sintered mullite, 45-flint clay and 57-andalusite, and the substrate is composed of 70-sintered mullite fine powder, white corundum fine powder, aluminate cement, 95 silicon micropowder and a small amount of alumina micropowder.
Example 1:
a novel mullite combined low-density castable comprises the following ingredients in proportion: 18 parts of 5-1 parts of 45-flint clay and 52 parts of 60-sintered mullite as main aggregates; the matrix part consists of 10 parts of 70 sintered mullite fine powder, 10 parts of fused white corundum fine powder, 3 parts of alumina micro powder, 4 parts of aluminate cement, 3 parts of silicon micro powder and 0.2 part of water reducing agent.
The physical property indexes of the mullite combined low-density castable prepared by the embodiment are as follows through detection: the bulk density of the sample block treated at 110 ℃ for 24h is 2.46g/cm3, the apparent porosity is 14.26%, the compressive strength is 67MPa, and the flexural strength is 8.9 MPa; the sample block has a compressive strength of 122MPa, a breaking strength of 22.2MPa and a residual line change of 0 to-0.6% after being treated at 1650 ℃ for 3 h. When the hot surface temperature is 1093 ℃, the thermal conductivity of the casting material is 1.520W/(m.K). And 3 fine cracks appear on the surface of the sample block in a thermal shock test at 1100 ℃, water cooling is carried out for 32 times, and the breaking strength retention rate is 78.2%.
Example 2
A novel mullite combined low-density castable comprises the following ingredients in proportion: 20 parts of 5-1 parts of 45 flint clay, 42 parts of 5-0 parts of 60 sintered mullite and 10 parts of 3-0 parts of 57 andalusite are taken as main aggregates, and the proportion of the matrix part is equivalent to that in the embodiment 1, so that the description is omitted.
The physical property indexes of the mullite combined low-density castable prepared by the embodiment are as follows through detection: the bulk density of the sample block treated at 110 ℃ for 24h is 2.46g/cm3, the apparent porosity is 15.16%, the compressive strength is 60MPa, and the flexural strength is 8.5 MPa; the sample block has a compressive strength of 94.4MPa, a breaking strength of 16.6MPa and a residual line change of 0-0.24% after being treated at 1650 ℃ for 3 h. When the hot surface temperature is 1093 ℃, the thermal conductivity of the casting material is 1.46W/(m.K). And 2 cracks appear on the surface of the sample block in a thermal shock test at 1100 ℃, water cooling is carried out for 32 times, and the breaking strength retention rate is 75.6%.
A novel mullite combined low-density castable comprises the following ingredients in proportion: 20 parts of 5-1 flint clay, 34 parts of 5-0 sintered mullite 60 and 16 parts of 3-0 andalusite 57 are used as main aggregates, and the proportion of the matrix part is equivalent to that in the embodiment 1, so that the description is omitted.
The physical property indexes of the mullite combined low-density castable prepared by the embodiment are as follows through detection: the bulk density of the sample block treated at 110 ℃ for 24h is 2.47g/cm3, the apparent porosity is 15.34%, the compressive strength is 58MPa, and the flexural strength is 7.0 MPa; the sample block has a compressive strength of 77.0MPa, a flexural strength of 15.8MPa and a residual line change of 0-0.80% after being treated at 1650 ℃ for 3 h. When the hot surface temperature is 1093 ℃, the thermal conductivity of the casting material is 1.55W/(m.K). And 3 cracks appear on the surface of the sample block in a thermal shock test at 1100 ℃, water cooling is carried out for 32 times, and the breaking strength retention rate is 72.3%.
Experiments show that the castable has a low thermal conductivity coefficient, and the thermal conductivity of the castable is 1.45-1.52W/(m.K) when the hot face temperature is 1093 ℃; in addition, the castable has excellent thermal shock stability, a small amount of cracks are generated on the surface of the castable after continuous water cooling for 32 times at 1100 ℃, and the breaking strength retention rate is 70-80%.
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 considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The preparation method of the novel mullite-combined lightweight castable comprises aggregate and a substrate, and is characterized in that the aggregate is composed of 60-sintered mullite, 45-flint clay and 57-andalusite, and the substrate is composed of 70-sintered mullite fine powder, white corundum fine powder, aluminate cement, 95-silicon micro powder and a small amount of alumina micro powder.
2. The preparation method of the novel mullite-bonded light castable according to claim 1, wherein the 60 sintered mullite has a grain size distribution in 5-3, 3-1 and 1-0, the addition amount is 30-52 parts, and the addition amount of the 70 sintered mullite fine powder is 5-10 parts.
3. The preparation method of the novel mullite-bonded lightweight castable according to claim 1, wherein the 45-flint clay aggregate has a particle size distribution of 5-3 and 3-1, and is added in an amount of 15-20 parts in the whole castable ingredients.
4. The preparation method of the novel mullite-bonded light castable according to claim 1, wherein the 57 andalusite has a particle size distribution in 3-1 and 1-0, and is added in an amount of 7-10 parts.
5. The preparation method of the novel mullite-bonded light castable according to claim 1, wherein the addition amount of the white corundum fine powder is 5-10 parts, the addition amount of the aluminate cement is 2-4 parts, the addition amount of the 95 silicon micro powder is 3-5 parts, and the addition amount of the alumina micro powder is 0-3 parts.
6. The preparation method of the novel mullite-bonded lightweight castable according to claim 1, wherein the 45-flint clay aggregate Al2O3 is more than or equal to 45%, the SiO2 is more than or equal to 50%, the size range of the particles is 5-1, the volume density is more than or equal to 2.43g/cm3, the apparent porosity is less than or equal to 7%, and the water absorption is less than or equal to 2.7%; the 60 mullite aggregate is prepared by a sintering method, wherein the content of Al2O3 is more than or equal to 62 percent, the content of SiO2 is more than or equal to 32 percent, the size range of particles is 5-0, the volume density is more than or equal to 2.70g/cm3, the apparent porosity is less than or equal to 1.5 percent, and the water absorption is less than or equal to 0.5 percent; the content of the 57 andalusite Al2O3 is more than or equal to 57 percent, the content of the SiO2 is more than or equal to 38 percent, the size range of the particles is 3-0, and the volume density of the particles is more than or equal to 3.1g/cm 3; the specification of the 70 sintered mullite fine powder is not more than 200 meshes, the content of Al2O3 is not less than 68%, the content of SiO2 is not more than 27%, and the sintered mullite fine powder is prepared by a sintering method; the content of Al2O3 in the white corundum fine powder is more than or equal to 99.3 percent, and the particle size is less than or equal to 76 mu m; the content of the 95 silicon micro powder SiO2 is more than or equal to 95 percent, the particle size is less than or equal to 3 mu m, the specification of the alumina micro powder is less than or equal to 5 mu m, and the content of Al2O3 is more than or equal to 99.2 percent; the specification of the calcium aluminate cement is less than or equal to 5 mu m, the content of Al2O3 is more than or equal to 68 percent, and the content of CaO is more than or equal to 27 percent.
7. The preparation method of the novel mullite-bonded light castable according to claim 1, wherein the mineral phase in the matrix is mainly corundum phase and mullite phase.
8. The preparation method of the novel mullite-bonded lightweight castable according to claim 1, characterized by comprising the following steps:
s1, weighing 60 parts by weight of sintered mullite aggregate, 15-20 parts by weight of 57 flint clay aggregate and 5-10 parts by weight of andalusite aggregate, uniformly stirring to form aggregate of the low-density castable, and preparing the materials;
s2, weighing 70 parts by weight of sintered mullite fine powder 5-10 parts, white corundum fine powder 5-10 parts, aluminate cement 2-4 parts and silicon micro powder 2-4 parts, wherein the ratio of Al2O3 to SiO2 is controlled between 4.5-5.5, uniformly stirring to form a matrix, and preparing materials;
and S3, uniformly stirring and mixing the aggregate of the low-density castable formed in the S1 and the matrix formed in the S2, and packaging after mixing.
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| CN111153708A (en) * | 2020-02-14 | 2020-05-15 | 辽宁科技大学 | Corundum-mullite multiphase gradient material for heat recovery coke oven door |
| CN111533569A (en) * | 2020-05-27 | 2020-08-14 | 郑州东豫新材料科技有限公司 | High-thermal-shock low-creep special-shaped refractory material and preparation method thereof |
| CN111592333A (en) * | 2020-05-25 | 2020-08-28 | 郑州东豫新材料科技有限公司 | Large special-shaped refractory material with rapid solidification, high thermal shock and low creep and preparation method thereof |
| CN111718203A (en) * | 2020-07-28 | 2020-09-29 | 中国一冶集团有限公司 | Refractory castable for converter sublance and preparation method thereof |
| CN112624747A (en) * | 2020-12-31 | 2021-04-09 | 长兴兴鹰新型耐火建材有限公司 | High-strength, corrosion-resistant and scouring-resistant castable for waste incineration kiln and preparation method thereof |
| CN114874018A (en) * | 2022-06-15 | 2022-08-09 | 平玉英 | Heat-insulating energy-saving high-temperature refractory material for industrial kiln and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111153708A (en) * | 2020-02-14 | 2020-05-15 | 辽宁科技大学 | Corundum-mullite multiphase gradient material for heat recovery coke oven door |
| CN111592333A (en) * | 2020-05-25 | 2020-08-28 | 郑州东豫新材料科技有限公司 | Large special-shaped refractory material with rapid solidification, high thermal shock and low creep and preparation method thereof |
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| CN114874018A (en) * | 2022-06-15 | 2022-08-09 | 平玉英 | Heat-insulating energy-saving high-temperature refractory material for industrial kiln and preparation method thereof |
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