CN108373322B - Production process of high-volume-density tabular corundum - Google Patents
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- CN108373322B CN108373322B CN201810191293.4A CN201810191293A CN108373322B CN 108373322 B CN108373322 B CN 108373322B CN 201810191293 A CN201810191293 A CN 201810191293A CN 108373322 B CN108373322 B CN 108373322B
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- 229910052593 corundum Inorganic materials 0.000 title claims abstract description 29
- 239000010431 corundum Substances 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 34
- 239000007788 liquid Substances 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 24
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 14
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 14
- 239000008188 pellet Substances 0.000 claims abstract description 13
- 125000004368 propenyl group Chemical group C(=CC)* 0.000 claims abstract description 11
- 239000007864 aqueous solution Substances 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims description 36
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 13
- 238000005507 spraying Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 7
- 238000010304 firing Methods 0.000 claims description 6
- 238000005453 pelletization Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 238000009740 moulding (composite fabrication) Methods 0.000 description 19
- 238000005245 sintering Methods 0.000 description 10
- 239000000654 additive Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 239000008213 purified water Substances 0.000 description 5
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 4
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000000498 ball milling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910001629 magnesium chloride Inorganic materials 0.000 description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 2
- 235000019341 magnesium sulphate Nutrition 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- -1 casting Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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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
- C04B35/01—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
- C04B35/101—Refractories from grain sized mixtures
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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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62695—Granulation or pelletising
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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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63448—Polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B35/63488—Polyethers, e.g. alkylphenol polyglycolether, polyethylene glycol [PEG], polyethylene oxide [PEO]
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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
- 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
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5427—Particle size related information expressed by the size of the particles or aggregates thereof millimeter or submillimeter sized, i.e. larger than 0,1 mm
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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
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
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Abstract
The invention discloses a production process of high-volume-density tabular corundum, which comprises a balling procedure, wherein balling liquid used in the balling procedure is 0.01-0.05% of propenyl polyethylene glycol aqueous solution by mass fraction. The invention adopts propenyl polyethylene glycol APEG to improve the wettability of fine powder and water, the fine powder is tightly gathered when forming green pellets, and the volume density of the green pellets can be improved under the same production process conditions; meanwhile, the structure of the plate-shaped corundum prepared by the method is not damaged at high temperature.
Description
Technical Field
The invention belongs to the field of refractory materials, relates to a preparation process of a tabular corundum refractory raw material, and particularly relates to a production process of a tabular corundum with high volume density.
Background
The plate-shaped corundum is a basic raw material in refractory materials and is formed by rapid sintering in a large-scale shaft kiln. It has high fire resistance, excellent mechanical strength, wear resistance, creep resistance and stripping resistance, high chemical purity, strong acid and alkali resistance, can be widely used in the industries of steel, casting, ceramics and the like, and is a substitute of high-energy power consumption fused corundum.
The production process of the tabular corundum comprises the following steps: gamma-alumina powder → ball milling → balling → drying → sintering → sorting (under burning and over burning) → crushing, screening, deironing → inspection → packaging.
The technological process and parameter control of the balling section are one of the key technologies in the production process of sintering tabular corundum, finely ground alumina powder is firstly balling by a disc or a roller balling machine to form material balls with the diameter of 10-12 mm, then the material balls with the diameter of 20-25 mm are formed by the roller balling machine, balling liquid is continuously sprayed in the whole balling process, the moisture content of the material balls is controlled to be 15-25%, and the formed alumina green balls enter a vertical kiln after being dried and then are sintered at high temperature. According to the characteristics of the production process, the green pellets are required to have high strength and density, so that the green pellets are not layered and are not easy to break in the transportation and firing processes. Otherwise, the inner wall of the kiln is easy to form a ring, so that the accident of frequently blocking the kiln is caused, the firing control is difficult, the fault removal is difficult, the maintenance cost is high, the phenomena of under-firing and over-firing of the fired product are obvious, and the ball body is easy to burst. Therefore, in the production process of the tabular corundum, the density of the green pellets is improved, which is beneficial to the production process and can ensure the density of the burnt product.
Chinese patent (application No. CN201110291458.3) discloses a preparation process of sintered tabular corundum, which intermittently sprays a balling liquid in the balling process, wherein the balling liquid comprises alumina gel (the concentration is between 0.2 and 0.4 percent) and phosphoric acid (the concentration is controlled between 0.1 and 0.2 percent).
Chinese patent (application No. CN201410276547.4) discloses a preparation method of tabular corundum with high volume density, wherein one of magnesium nitrate, magnesium chloride or magnesium sulfate is dissolved in water to obtain a balling liquid, the mass ratio of solute to water in the balling liquid is 0.5-3: 1, and the solute is one of magnesium nitrate, magnesium chloride or magnesium sulfate. gamma-Al is carried out by using the liquid2O3And (3) pelletizing the fine powder, and drying, calcining, cooling and forming the obtained pellets in sequence to obtain the tabular corundum with high volume density.
However, the addition of too much additives to the sphering liquid in the above process may affect the purity of the tabular corundum to some extent.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a novel preparation process of a plate-shaped corundum refractory raw material, and the performance index of the produced plate-shaped corundum can be improved only by adding a small amount of additives into a balling liquid.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a production process of high-volume-density tabular corundum comprises a balling procedure, wherein balling liquid used in the balling procedure is 0.01-0.05% of propenyl polyethylene glycol aqueous solution by mass fraction.
According to the invention, 0.01-0.05% of propenyl polyethylene glycol is added into the balling liquid, the additive is less, the alumina fine powder can form more compact green balls, and meanwhile, other flux components are not added into the balling liquid, so that the prepared tabular corundum has a more stable structure at high temperature.
Hair brushAnother object of the invention is to provide a tabular corundum prepared by the above production process, which has a bulk density of not less than 3.65g/cm3。
The invention has the beneficial effects that:
1. the allyl polyethylene glycol APEG can improve the wettability of the fine powder and water, and the fine powder is tightly gathered when forming a green ball.
2. The high-temperature performance is good, the allyl polyethylene glycol APEG is an organic matter and does not contain any flux component, and the structure of the prepared product is not damaged at high temperature.
3. The additive has good effect and low price, and can improve the volume density of the raw material balls under the same production process conditions.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In this application D50 represents the cumulative 50% point diameter (or 50% pass particle size).
As introduced by the background art, the prior art has the defect that the components of the additive of the balling liquid are too high, and in order to solve the technical problems, the application provides a production process of the plate-shaped corundum with high volume density.
The production process of the high-volume-density tabular corundum comprises a balling process, wherein a balling liquid used in the balling process is 0.01-0.05% of propenyl polyethylene glycol aqueous solution by mass fraction.
According to the method, 0.01-0.05% of propenyl polyethylene glycol is added into the balling liquid, the additive is less, the alumina fine powder can form tighter green balls, and meanwhile, other flux components are not added into the balling liquid, so that the prepared tabular corundum is more stable in structure at high temperature.
Preferably, the balling process comprises the following steps: adding the ball-milled fine powder into a first ball forming machine, continuously spraying a ball forming liquid (the total mass is controlled to be 15-25%, and the ball forming machine adjusts the ball forming liquid on site according to the dry and wet conditions) to form small raw material balls with the diameter of 10-12 mm, adding the small raw material balls into a second ball forming machine, and continuously spraying the ball forming liquid to form large raw material balls with the diameter of 20-25 mm. If the balls are formed in one step, the production efficiency is low, the quality of the balls is not easy to control, when the balls grow together, the amount of the added ball forming powder is not easy to control, the uniformity of the green balls is poor, and cracks are easy to generate.
More preferably, the first and second ball forming machines have the same specification.
Preferably, the volume density of the raw material balls obtained in the balling process is not less than 1.90g/cm3。
Preferably, the method comprises a ball milling process, wherein the gamma-alumina powder is ground to obtain fine powder with the D50 of 7-10 mu m.
Preferably, the method comprises a drying step of drying pellets obtained after the pelletizing step. More preferably, the drying temperature in the drying step is 400 to 450 ℃.
Preferably, the method comprises a sintering process, wherein the sintering temperature is 1850-1900 ℃.
The application preferably selects a production process of the high-volume-density tabular corundum, and the production process comprises the following steps:
1) grinding the gamma-alumina powder to obtain fine powder with D50 of 7-10 mu m;
2) adding the fine powder into a first ball forming machine, continuously spraying a ball forming liquid to form small raw material balls with the diameter of 10-12 mm, adding the small raw material balls into a second ball forming machine, and continuously spraying the ball forming liquid to form large raw material balls with the diameter of 20-25 mm;
3) and continuously drying the large raw material balls at 400-450 ℃, firing at 1850-1900 ℃, and cooling to 80 +/-5 ℃ to obtain the high-volume-density tabular corundum.
In another embodiment of the application, the tabular corundum prepared by the production process is provided, and the volume density is not less than 3.65g/cm3。
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific examples and comparative examples.
The propylene-based polyethylene glycol added in the examples is a product of FS10 chemical company Limited in Wuhan Shangda.
Example 1
1. Grinding the gamma-alumina powder to obtain fine powder with D50 of 7 mu m;
2. adding the fine powder into a roller type granulator with the diameter of 2.4m multiplied by 6m, continuously spraying a granulating liquid to form small raw material balls with the diameter of 10-12 mm, processing the small balls, adding the processed small balls into the granulator with the same specification, and forming large raw material balls with the diameter of 20-25 mm under the same operation. The balling liquid is prepared by adding 0.01% of propenyl polyethylene glycol APEG in purified water.
3. Continuously drying the large raw material balls at 400-450 ℃, then sending the large raw material balls into a shaft kiln, sintering at 1850-1900 ℃, cooling to 80 +/-5 ℃, taking out of the kiln, and crushing into products with different specifications and sizes after detection.
The bulk density of the green pellets was 1.92g/cm3The bulk density of the fired product was 3.67g/cm3。
Example 2
1. Grinding the gamma-alumina powder to obtain fine powder with D50 being 8 mu m;
2. adding the fine powder into a roller type granulator with the diameter of 2.4m multiplied by 6m, continuously spraying a granulating liquid to form small raw material balls with the diameter of 10-12 mm, processing the small balls, adding the processed small balls into the granulator with the same specification, and forming large raw material balls with the diameter of 20-25 mm under the same operation. The balling liquid is prepared by adding 0.05% of propenyl polyethylene glycol APEG in purified water.
3. Continuously drying the large raw material balls at 400-450 ℃, then sending the large raw material balls into a shaft kiln, sintering at 1850-1900 ℃, cooling to 80 +/-5 ℃, taking out of the kiln, and crushing into products with different specifications and sizes after detection.
The bulk density of the green pellets was 1.91g/cm3The bulk density of the fired product was 3.66g/cm3。
Example 3
1. Grinding the gamma-alumina powder to obtain fine powder with D50 being 10 mu m;
2. adding the fine powder into a roller type granulator with the diameter of 2.4m multiplied by 6m, continuously spraying a granulating liquid to form small raw material balls with the diameter of 10-12 mm, processing the small balls, adding the processed small balls into the granulator with the same specification, and forming large raw material balls with the diameter of 20-25 mm under the same operation. The balling liquid is prepared by adding 0.025% of propenyl polyethylene glycol APEG in purified water.
3. Continuously drying the large raw material balls at 400-450 ℃, then sending the large raw material balls into a shaft kiln, sintering at 1850-1900 ℃, cooling to 80 +/-5 ℃, taking out of the kiln, and crushing into products with different specifications and sizes after detection.
The bulk density of the green pellets was 1.90g/cm3The bulk density of the fired product was 3.65g/cm3。
Comparative example 1
1. Grinding the gamma-alumina powder to obtain fine powder with D50 of 7 mu m;
2. adding the fine powder into a roller type granulator with the diameter of 2.4m multiplied by 6m, continuously spraying purified water to form small raw material balls with the diameter of 10-12 mm, treating the small balls, adding the treated small balls into the granulator with the same specification, and forming large raw material balls with the diameter of 20-25 mm under the same operation.
3. Continuously drying the large raw material balls at 400-450 ℃, then sending the large raw material balls into a shaft kiln, sintering at 1850-1900 ℃, cooling to 80 +/-5 ℃, taking out of the kiln, and crushing into products with different specifications and sizes after detection.
The bulk density of the green pellets was 1.71g/cm3The bulk density of the fired product was 3.52g/cm3。
Comparative example 2
1. Grinding the gamma-alumina powder to obtain fine powder with D50 of 7 mu m;
2. adding the fine powder into a roller type granulator with the diameter of 2.4m multiplied by 6m, intermittently spraying a granulating liquid to form small raw material balls with the diameter of 10-12 mm, processing the small balls, adding the processed small balls into the granulator with the same specification, and forming large raw material balls with the diameter of 20-25 mm under the same operation. The balling liquid is prepared by adding 0.1% of propenyl polyethylene glycol APEG in purified water.
3. Continuously drying the large raw material balls at 400-450 ℃, then sending the large raw material balls into a shaft kiln, sintering at 1850-1900 ℃, cooling to 80 +/-5 ℃, taking out of the kiln, and crushing into products with different specifications and sizes after detection.
The bulk density of the green pellets was 1.85g/cm3The bulk density of the fired product was 3.55g/cm3。
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (4)
1. A production process of high-volume-density tabular corundum is characterized by comprising a balling procedure, wherein balling liquid used in the balling procedure is 0.01-0.05% of propenyl polyethylene glycol aqueous solution by mass fraction;
the method comprises the following steps:
1) grinding the gamma-alumina powder to obtain fine powder with D50 of 7-10 mu m;
2) adding the fine powder into a first ball forming machine, continuously spraying a ball forming liquid to form small raw material balls with the diameter of 10-12 mm, adding the small raw material balls into a second ball forming machine, and continuously spraying the ball forming liquid to form large raw material balls with the diameter of 20-25 mm;
3) and continuously drying the large raw material balls at 400-450 ℃, firing at 1850-1900 ℃, and cooling to 80 +/-5 ℃ to obtain the high-volume-density tabular corundum.
2. The process according to claim 1, wherein the first and second pelletizer have the same specifications.
3. The production process as claimed in claim 1, wherein the green pellet obtained in the pelletizing step has a bulk density of not less than 1.90g/cm3。
4. A tabular corundum prepared by the production process according to any one of claims 1 to 3, characterized in that the bulk density is not less than 3.65g/cm3。
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|---|---|---|---|---|
| US3802893A (en) * | 1972-08-28 | 1974-04-09 | Gte Sylvania Inc | Polycrystalline abrasion-resistant alumina compositions |
| CN1970499A (en) * | 2006-11-30 | 2007-05-30 | 华南理工大学 | Preparation method of compact ceramic of highly-oriented arrangement |
| CN101314546A (en) * | 2007-06-01 | 2008-12-03 | 李正坤 | Processing technique for rare earth corundum |
| CN102040373A (en) * | 2009-10-13 | 2011-05-04 | 江苏晶辉耐火材料有限公司 | Zirconium mullite and process thereof |
| CN102503448A (en) * | 2011-09-30 | 2012-06-20 | 汉中秦元新材料有限公司 | Preparation technology of sintered tabular corundum |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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