CN113149671A - Casting molding process of light mullite-alumina hollow sphere-aluminum titanate sagger - Google Patents
Casting molding process of light mullite-alumina hollow sphere-aluminum titanate sagger Download PDFInfo
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- CN113149671A CN113149671A CN202110314143.XA CN202110314143A CN113149671A CN 113149671 A CN113149671 A CN 113149671A CN 202110314143 A CN202110314143 A CN 202110314143A CN 113149671 A CN113149671 A CN 113149671A
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 229910000505 Al2TiO5 Inorganic materials 0.000 title claims abstract description 29
- 238000005266 casting Methods 0.000 title claims abstract description 26
- 238000000465 moulding Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 54
- 239000000843 powder Substances 0.000 claims abstract description 37
- 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 35
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 35
- 238000001035 drying Methods 0.000 claims abstract description 24
- 239000002002 slurry Substances 0.000 claims abstract description 20
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000004568 cement Substances 0.000 claims abstract description 11
- AABBHSMFGKYLKE-SNAWJCMRSA-N propan-2-yl (e)-but-2-enoate Chemical compound C\C=C\C(=O)OC(C)C AABBHSMFGKYLKE-SNAWJCMRSA-N 0.000 claims abstract description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 235000019832 sodium triphosphate Nutrition 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 7
- 239000010703 silicon Substances 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 238000005303 weighing Methods 0.000 claims abstract description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 9
- 229910052593 corundum Inorganic materials 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 7
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 6
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 5
- 239000004927 clay Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 229910052681 coesite Inorganic materials 0.000 claims description 3
- 229910052906 cristobalite Inorganic materials 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 229910052682 stishovite Inorganic materials 0.000 claims description 3
- 239000004408 titanium dioxide Substances 0.000 claims description 3
- 229910052905 tridymite Inorganic materials 0.000 claims description 3
- 239000011863 silicon-based powder Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000011819 refractory material Substances 0.000 abstract description 2
- 230000035939 shock Effects 0.000 description 6
- 239000010431 corundum Substances 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
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- 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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- 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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3232—Titanium oxides or titanates, e.g. rutile or anatase
- C04B2235/3234—Titanates, not containing zirconia
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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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- C04B2235/02—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
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/447—Phosphates or phosphites, e.g. orthophosphate or hypophosphite
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Abstract
The invention discloses a casting molding process of a lightweight mullite-alumina hollow sphere-aluminum titanate sagger, which relates to the field of refractory materials, and comprises the following steps of weighing 2-6 parts of Suzhou mud 2-6 parts, 4-6 parts of silicon micropowder, 4-8 parts of alpha-alumina powder, 4-6 parts of alpha-alumina micropowder, 6-10 parts of calcium aluminate cement, 11-21 parts of electric fused mullite powder, 3-11 parts of aluminum titanate powder, 10-20 parts of alumina hollow spheres with the particle size of 0.2-1mm, 4-6 parts of alumina hollow spheres with the particle size of 1-3mm, 10-20 parts of lightweight mullite particles with the particle size of not more than 1mm, 10-20 parts of lightweight mullite particles with the particle size of 1-3mm and 0.2-0.3 part of sodium tripolyphosphate by weight, fully mixing in a stirrer, 12-16 parts of water is added, slurry with certain fluidity and viscoplasticity is formed after full stirring, then the slurry is poured into a mould for casting and molding, the product is taken out after demoulding, and the product is put into a drying kiln for drying, so that the manufactured sagger is light in weight and long in service life, the casting process can greatly reduce the investment cost of a production line, and the cost performance is higher.
Description
Technical Field
The invention relates to the field of refractory materials, in particular to a casting molding process of a light mullite-alumina hollow sphere-aluminum titanate sagger.
Background
Currently, high-temperature saggers suitable for temperatures of 1500 ℃ or higher are all made of fused mullite and corundum, and for example, chinese patent application CN201810903009.1 discloses a "sagger for high-temperature firing" which is made of alumina powder, kaolin powder, clay powder, white corundum, quartz, mullite, etc. as raw materials, and is formed by mixing and molding the raw materials and then firing at a high temperature. Compared with the quartz, mullite and saggar which is synthesized in advance on the market and then is formed by mixing, the produced finished product phase is more uniform, the color and the thermal shock stability are better, and the thermal expansion coefficient of the produced phase is small, so that the thermal shock resistance is extremely high, the quartz is added, the thermal shock performance can be improved, the crack resistance, the uniformity and the quality stability of the product can be kept during batch production, and the saggar is suitable for the environment with larger temperature difference. The method has the defects of short service life and instability, and takes fluorescent powder sintering as an example, the service life is 10-30 times at present.
Disclosure of Invention
In order to further prolong the service life of the sagger for sintering the product with the sintering temperature higher than 1500 ℃, the invention overcomes the defects and provides the pouring forming process of the light mullite-alumina hollow sphere-aluminum titanate sagger with light weight, high cost performance and long service life.
In order to achieve the purpose, the invention provides the following technical scheme:
the casting molding process of the lightweight mullite-alumina hollow sphere-aluminum titanate sagger is characterized by comprising the following steps of weighing 2-6 parts by weight of Suzhou mud 2-6 parts by weight, 4-6 parts by weight of silicon micropowder, 4-8 parts by weight of alpha-alumina powder, 4-6 parts by weight of alpha-alumina micropowder, 6-10 parts by weight of calcium aluminate cement, 11-21 parts by weight of fused mullite powder, 3-11 parts by weight of aluminum titanate powder, 10-20 parts by weight of alumina hollow spheres with the particle size of 0.2-1mm, 4-6 parts by weight of alumina hollow spheres with the particle size of 1-3mm, 10-20 parts by weight of lightweight mullite particles with the particle size of not more than 1mm, 10-20 parts by weight of lightweight mullite particles with the particle size of 1-3mm and 0.2-0.3 part by weight of sodium tripolyphosphate, fully mixing the materials in a mixer, adding 12-16 parts by weight of water, after fully stirring, forming slurry with fluidity viscoplasticity, pouring the slurry into a mould for casting molding, demoulding and taking out a product, and putting the product into a drying kiln for drying.
Further, Al of the Suzhou mud II2O333-35% of Fe2O3Content is less than or equal to 0.80 percent, K2O+Na2The content of O is less than or equal to 0.80 percent, and the fineness is less than 10 percent after 320 meshes; SiO of the silicon micropowder2The content is more than 95% particle diameter D50Less than 0.5 μm; al of the alpha-alumina powder2O3The content is more than 95 percent, and the fineness is less than 10 percent after 320 meshes; al of the alpha-alumina micropowder2O3The content is more than 95 percent, and the median diameter D50 of the particle size is less than 2 mu m; al of the aluminum titanate2O3The content is more than 54 percent, the content of titanium dioxide is more than 42 percent, and the fineness is less than 10 percent after 320 meshes; al of the electrically fused mullite powder2O3The content is 68-73%, the fineness is 320 meshes, and the residue is less than 10%.
Further, Al of the calcium aluminate cement2O3The content is 68-77%, and the fineness is less than 10% after 320-mesh sieving.
Further, the alumina content of the alumina hollow sphere is more than 99%.
Further, the volume density of the light mullite grains is less than or equal to 2g/cm3，Al2O3The content is more than or equal to 60 percent, and SiO is2Less than or equal to 37 percent of Al2O3+SiO2The content is more than or equal to 97 percent, and Fe2O3+TiO2The content is less than or equal to 2 percent.
Furthermore, the light mullite particles are prepared by introducing saw dust into high-purity clay and alumina powder as pore-forming agents, and crushing the materials after high-temperature sintering.
Further, when pouring, pouring the prepared slurry into a mould, placing the mould on a vibration table or using an inserted vibration rod or a flat plate vibrator, and filling the space in the mould with the slurry through vibration.
Further, the product formed in the mold can be automatically coagulated and hardened after standing for 24 hours, when the strength is up to the strength of demolding and moving, the product is taken out after demolding, the product is put into a drying kiln after curing for 5 days at normal temperature, and the drying time is 24 to 48 hours at the temperature of between 70 and 200 ℃, so that the light mullite-alumina hollow sphere-aluminum titanate sagger can be obtained.
Further, the drying temperature is 70-90 ℃.
Further, the sagger comprises the following raw materials in parts by weight: 4 parts of Suzhou mud II, 5 parts of silicon micropowder, 5 parts of alpha-alumina powder, 5 parts of alpha-alumina micropowder, 8 parts of calcium aluminate cement, 16 parts of fused mullite powder, 7 parts of aluminum titanate powder, 15 parts of alumina hollow spheres with the particle size of 0.2-1mm, 5 parts of alumina hollow spheres with the particle size of 1-3mm, 15 parts of light mullite particles with the particle size of not more than 1mm, 15 parts of light mullite particles with the particle size of 1-3mm, 0.25 part of sodium tripolyphosphate and 14 parts of water.
Furthermore, sodium tripolyphosphate is used as a dispersing agent, and calcium aluminate cement is used as a bonding agent.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention adopts a casting method for molding, and slurry has excellent fluidity by adjusting the dosage of the dispersant and the water, so that the slurry is convenient to directly pour into a pre-designed mold to fill the space of the mold. In order to further improve the product performance and reduce air bubbles, pre-prepared slurry can be poured into a mould and placed on a vibration table or an inserted vibration rod or a flat plate vibrator is used for filling the space in the mould with the slurry through vibration; standing the product formed in the mold for 24 hours to be automatically condensed and hardened, demoulding and taking out the product when the strength reaches the strength capable of being demoulded and moved, curing for 5 days at normal temperature, then putting the product into a drying kiln, and drying for 24-48 hours at the temperature of 70-200 ℃ to obtain the light mullite-alumina hollow sphere-aluminum titanate sagger;
(2) the light mullite particles are prepared by introducing saw dust into high-purity clay and alumina powder as pore-forming agents and crushing the high-temperature sintered light mullite particles, and the high-temperature sintered light mullite particles contain rich holes, and stress generated by rapid cooling and rapid heating can be effectively released in practical application to generate micro cracks and macro cracks; the alumina hollow spheres have better thermal shock resistance than corundum particles, the melting point of the product is 2100 ℃, and the product also has good thermal shock resistance, and the introduction of the alumina hollow spheres can effectively improve the service temperature of the product;
(3) the aluminum titanate mainly takes ionic bonds and covalent bonds as bonding bonds, and has a crystal phase and air holes inside from the aspect of microstructure and state, the melting point of the aluminum titanate is up to 1860 ℃, and the aluminum titanate has low thermal expansion coefficient and high thermal shock resistance, thereby laying a foundation for the production of a long-life sagger with the use temperature of more than 1500 ℃;
in conclusion, compared with the traditional product, the sagger has the advantages of light weight and long service life of the sagger, the casting process can greatly reduce the investment cost of a production line, and the cost performance is higher.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a casting molding process of a lightweight mullite-alumina hollow sphere-aluminum titanate sagger, which is characterized in that 2-6 parts of Suzhou mud, 4-6 parts of silicon powder, 4-8 parts of alpha-alumina powder, 4-6 parts of alpha-alumina powder, 6-10 parts of calcium aluminate cement, 11-21 parts of electric fused mullite powder, 3-11 parts of aluminum titanate powder, 10-20 parts of alumina hollow spheres with the particle size of 0.2-1mm, 4-6 parts of alumina hollow spheres with the particle size of 1-3mm, 10-20 parts of lightweight mullite particles with the particle size of not more than 1mm, 10-20 parts of lightweight mullite particles with the particle size of 1-3mm and 0.2-0.3 part of sodium tripolyphosphate are weighed according to parts by weight and are placed into a stirrer to be fully mixed, adding 12-16 parts of water, fully stirring to form slurry with fluidity, viscosity and plasticity, pouring the slurry into a mold for casting molding, demolding, taking out a product, and putting the product into a drying kiln for drying.
Wherein Al of the Suzhou No. two mud2O333-35% of Fe2O3Content is less than or equal to 0.80 percent, K2O+Na2The content of O is less than or equal to 0.80 percent, and the fineness is less than 10 percent after 320 meshes; SiO of the silicon micropowder2The content is more than 95 percent, and the diameter D of the particles50Less than 0.5 μm; al of the alpha-alumina powder2O3The content is more than 95 percent, and the fineness is less than 10 percent after 320 meshes; al of the alpha-alumina micropowder2O3The content is more than 95 percent, and the median diameter D50 of the particle size is less than 2 mu m; al of the aluminum titanate2O3The content is more than 54 percent, the content of titanium dioxide is more than 42 percent, and the fineness is less than 10 percent after 320 meshes; al of the electrically fused mullite powder2O3The content is 68-73%, and the fineness is 320 meshes and the screen residue is less than 10%.
Further, Al of the calcium aluminate cement2O3The content is 68-77%, and the fineness is less than 10% after 320-mesh sieving.
Further, the alumina content of the alumina hollow sphere is more than 99%.
Further, the volume density of the light mullite grains is less than or equal to 2g/cm3，Al2O3The content is more than or equal to 60 percent, and SiO is2Less than or equal to 37 percent of Al2O3+SiO2The content is more than or equal to 97 percent, and Fe2O3+TiO2The content is less than or equal to 2 percent.
Example 1
The invention provides a casting molding process of a lightweight mullite-alumina hollow sphere-aluminum titanate sagger, which comprises the following steps of weighing 2 parts of Suzhou mud, 6 parts of silica powder, 4 parts of alpha-alumina powder, 10 parts of calcium aluminate cement, 11 parts of electric fused mullite powder, 11 parts of aluminum titanate powder, 18 parts of alumina hollow spheres with the particle size of 0.2-1mm, 4 parts of alumina hollow spheres with the particle size of 1-3mm, 10 parts of lightweight mullite particles with the particle size of not more than 1mm, 20 parts of lightweight mullite particles with the particle size of 1-3mm and 0.3 part of sodium tripolyphosphate by weight, fully mixing the materials in a stirrer, adding 16 parts of water, fully stirring to form slurry with certain fluidity and viscoplasticity, pouring the slurry into a mould, placing the slurry on a shaking table or using an inserted type shaking bar or a flat plate, the slurry is filled in the space in the die by vibration, the formed product can be automatically coagulated and hardened after standing for 24 hours, when the strength reaches the strength of demoulding and moving, the product is demoulded and taken out, the product is put into a drying kiln after being cured for 5 days at normal temperature, and the drying time is 36 hours at the temperature of 90 ℃, so that the lightweight mullite-alumina hollow sphere sagger can be obtained, and the performance index is shown in table 1. Examples 2-7 referring to example 1, the raw material formulation and the product performance index are shown in table 1.
TABLE 1
Examples 8 to 10, the raw materials were combined in the same manner as in example 4, and the drying temperature and the properties of the product are shown in Table 2.
TABLE 2
| Example 4 | Example 8 | Example 9 | Example 10 | |
| Density, g/cm3 | 2.33 | 2.33 | 2.33 | 2.33 |
| Oven drying at a temperature of | 90 | 70 | 150 | 200 |
| Drying time, h | 36 | 36 | 36 | 36 |
| Number of times of use | 65 | 63 | 55 | 49 |
Therefore, the service life of the product can be influenced by overhigh drying temperature, and the preferable drying temperature is 70-90 ℃.
Examples 11-13, the raw material compatibility was the same as in example 4, and the drying time and product properties are shown in Table 3.
TABLE 3
Therefore, the drying time of more than 30 hours does not affect the product performance basically.
The sagger prepared in the above embodiments 1 to 13 has no crack, no falling, no damage in the surface state after 30 times of use, and as can be seen from tables 1 to 3, the service life is about 48 to 65 times, which is much longer than the service life of the current high temperature sagger in the market by 10 to 30 times, and the sagger is light in weight, the casting process can greatly reduce the investment cost of the production line, and the process cost performance of the invention is higher.
Claims (10)
1. The casting molding process of the lightweight mullite-alumina hollow sphere-aluminum titanate sagger is characterized by comprising the following steps of weighing 2-6 parts of Suzhou mud 2, 4-6 parts of silicon powder, 4-8 parts of alpha-alumina powder, 4-6 parts of alpha-alumina powder, 6-10 parts of calcium aluminate cement, 11-21 parts of fused mullite powder, 3-11 parts of aluminum titanate powder, 10-20 parts of alumina hollow spheres with the particle size of 0.2-1mm, 4-6 parts of alumina hollow spheres with the particle size of 1-3mm, 10-20 parts of lightweight mullite particles with the particle size of not more than 1mm, 10-20 parts of lightweight mullite particles with the particle size of 1-3mm and 0.2-0.3 part of sodium tripolyphosphate, putting the materials into a stirrer for fully mixing, adding 12-16 parts of water, after fully stirring, forming slurry with fluidity viscoplasticity, pouring the slurry into a mould for casting molding, demoulding and taking out a product, and putting the product into a drying kiln for drying.
2. The casting process of claim 1, wherein the Al of the suzhou mud ii is formed by casting a mullite-alumina hollow sphere-aluminum titanate sagger2O333-35% of Fe2O3Content is less than or equal to 0.80 percent, K2O+Na2The content of O is less than or equal to 0.80 percent, and the fineness is less than 10 percent after 320 meshes; SiO of the silicon micropowder2The content is more than 95 percent, and the diameter D of the particles50Less than 0.5 μm; al of the alpha-alumina powder2O3The content is more than 95 percent, and the fineness is less than 10 percent after 320 meshes; al of the alpha-alumina micropowder2O3The content is more than 95 percent, and the median diameter D50 of the particle size is less than 2 mu m; al of the aluminum titanate2O3The content is more than 54 percent, the content of titanium dioxide is more than 42 percent, and the fineness is less than 10 percent after 320 meshes; al of the electrically fused mullite powder2O3The content is 68-73%, the fineness is 320 meshes, and the residue is less than 10%.
3. The casting process of claim 1, wherein the Al of the calcium aluminate cement is2O3The content is 68-77%, and the fineness is less than 10% after 320-mesh sieving.
4. The casting molding process of the light mullite-alumina hollow sphere-aluminum titanate sagger as claimed in claim 1, wherein the alumina content of the alumina hollow sphere is more than 99%.
5. The casting molding process of the light mullite-alumina hollow sphere-aluminum titanate sagger as claimed in claim 1, wherein the volume density of the light mullite grains is less than or equal to 2g/cm3，Al2O3The content is more than or equal to 60 percent, and SiO is2Less than or equal to 37 percent of Al2O3+SiO2The content is more than or equal to 97 percent, and Fe2O3+TiO2The content is less than or equal to 2 percent.
6. The casting molding process of the light mullite-alumina hollow sphere-aluminum titanate sagger as claimed in claim 1 or 5, wherein the light mullite particles are prepared by introducing saw dust as a pore-forming agent into high-purity clay and alumina powder, sintering at high temperature and crushing.
7. The process of claim 1, wherein the casting is carried out by pouring the slurry into a mold, placing the mold on a vibrating table or using an inserted vibrating rod or a flat vibrator, and vibrating to fill the space in the mold with the slurry.
8. The casting molding process of the lightweight mullite-alumina hollow sphere-aluminum titanate sagger as claimed in claim 1 or 7, wherein the molded product in the mold is allowed to stand for 24 hours to be automatically solidified and hardened, and when the strength of the molded product is enough to be removed, the molded product is taken out after demolding, and is put into a drying kiln after being maintained for 5 days at normal temperature, and the lightweight mullite-alumina hollow sphere-aluminum titanate sagger is obtained after the drying time is 24-48 hours at the temperature of 70-200 ℃.
9. The casting molding process of the light mullite-alumina hollow sphere-aluminum titanate sagger as claimed in claim 1 or 7, wherein the drying temperature is 70-90 ℃.
10. The casting molding process of the light mullite-alumina hollow sphere-aluminum titanate sagger as claimed in claim 1, wherein the sagger comprises the following raw materials in parts by weight: 4 parts of Suzhou mud II, 5 parts of silicon micropowder, 5 parts of alpha-alumina powder, 5 parts of alpha-alumina micropowder, 8 parts of calcium aluminate cement, 16 parts of fused mullite powder, 7 parts of aluminum titanate powder, 15 parts of alumina hollow spheres with the particle size of 0.2-1mm, 5 parts of alumina hollow spheres with the particle size of 1-3mm, 15 parts of light mullite particles with the particle size of not more than 1mm, 15 parts of light mullite particles with the particle size of 1-3mm, 0.25 part of sodium tripolyphosphate and 14 parts of water.
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