CN85102281A - The manufacture method of low-sodium 2-alumina of superfine grains - Google Patents
The manufacture method of low-sodium 2-alumina of superfine grains Download PDFInfo
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- CN85102281A CN85102281A CN198585102281A CN85102281A CN85102281A CN 85102281 A CN85102281 A CN 85102281A CN 198585102281 A CN198585102281 A CN 198585102281A CN 85102281 A CN85102281 A CN 85102281A CN 85102281 A CN85102281 A CN 85102281A
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- aluminum oxide
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- alumina
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
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- Compositions Of Oxide Ceramics (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Modern industry requires grain fineness number more and more thin to the aluminum oxide of making pipoint technique pottery usefulness, is difficult to reach this requirement with general method.The method that the present invention makes the low ultra-fine alpha-type aluminum oxide of sodium is to be raw material with general industry aluminum oxide or aluminium hydroxide, add 0.03～0.4% fluorochemical, do not add or add a spot of boride or muriate again, make alpha-type aluminum oxide 1200～1500 ℃ of roastings, grain fineness number is about 1 micron, remove wherein solubility sodium oxide through washing, then can obtain sodium oxide content and be 0.2～0.04% the ultra-fine alpha-type aluminum oxide of low sodium, process is simple.This aluminum oxide is applicable to makes various pipoint technique ceramic products.
Description
The ultra-fine alpha-type aluminum oxide of low sodium that the present invention produces is applicable to makes various accurate aluminum oxide technical ceramicses.
Aluminum oxide pipoint technique ceramic all requires the grain fineness number of aluminum oxide thinner.When now each factory of China makes low sodium alpha-type aluminum oxide, all be to be raw material with aluminum oxide or aluminium hydroxide, add 1～3% boride therein after, become alpha-type aluminum oxide 1400 ℃ of left and right sides calcination again, this product can only be used for general use.Along with science and technology development need be made high-quality accurate aluminium oxide ceramic products, it requires, and crystal size will be carefully to about 1 micron in the alumina raw material.But existing its grain fineness number of alpha-type aluminum oxide that adds the boride calcination is many more than 1 micron, the aluminum oxide of Sheng Chaning in this way, though use long ball milling, its fineness can not satisfy the requirement of high technology ceramics to granularity.
External have for the patent of the low sodium α type close grain aluminum oxide of raw material manufacturing with the aluminum oxide: United States Patent (USP) 3092452; 4045234; Deutsches Reichs-Patent 1592105; French Patent 1429564; English Patent 829602; 2108949; Deutsches Wirtschafts Patent 160611.They all are is main additive with the boride or adds halogenide, magnesium salts etc.United States Patent (USP) 3175883; 3262754; 3532460; French Patent 1385327,1495893; The clear 47-5744 of Deutsches Reichs-Patent 2816194 and Japanese Patent is based on the additive of muriate or chlorine or ammonification salt and villiaumite again.United States Patent (USP) 2887361 and 2961297; Propositions such as Deutsches Reichs-Patent 1159419 are main additive with the aluminum fluoride, and its addition is 0.5～10%.The addition of additive is all bigger in above-mentioned each patent.
The objective of the invention is to seek a kind of novel method, it is low to 0.2～0.04% to produce a kind of sodium oxide content, and the alpha-type aluminum oxide that the crystal size average out to is 0.8～1.5 micron is to satisfy the requirement of pipoint technique ceramic.
Main points of the present invention are: with commercial alumina or aluminium hydroxide is raw material, also can be aluminum oxide or the aluminium hydroxide that other method is produced,, not add or only add a small amount of boride to add fluorochemical, do not add or only add on a small quantity muriate, mixing.The fluorochemical of above-mentioned interpolation can be hydrogen fluoride, metal fluoride or other fluorochemical, and its addition is 0.03～0.4% of an alumina weight.The boride of above-mentioned interpolation can be boron oxide, boric acid or other boride, and its addition is 0～0.3% of an alumina weight.The muriate of above-mentioned interpolation can be muriate or other muriate of hydrogenchloride, metal, and its addition is 0～0.3% of an alumina weight.Mixture roasting in 1200～1500 ℃ of scopes, roasting time depends on kind, addition and the maturing temperature of additive.Be that temperature is high more, addition is many more, and the time just can shorten, and general roasting time is 0.1～16 hour.Alpha-type aluminum oxide in the gained finished product 〉=90%, true specific gravity 〉=3.90, sodium oxide content is reduced to below 0.3% by 0.5～0.6%.The alpha-type aluminum oxide crystal size is at 0.6～2 micron in the alumina particle.In order further to reduce sodium oxide content, can be with the said products with diluted acid and water or wash with water separately, dry, remove wherein solubility sodium oxide, make that sodium oxide content is reduced to 0.2～0.04% in the aluminum oxide, wherein use sour extractible sodium oxide below 0.05%.Alumina particle is crushed to crystal size, can uses ball milling, comminution by gas stream or other breaking method.
What this ultra-fine low sodium alpha-type aluminum oxide that makes for the main additive roasting with the fluorochemical and China produced now is that the low sodium alpha-type aluminum oxide that additive makes is compared with the boride, biggest advantage is that grain fineness number is thin, can be used for preparing the aluminum oxide powder about 1 micron, it is a raw material of making high technology ceramics.With boride is that the alpha-alumina crystals granularity of additive roasting is big, though long-time steel ball mill is levigate, also difficulty reaches this fineness.With the ultra-fine alumina contrast that with ultrafine aluminium hydroxide is the raw material making, then the price of aluminium oxide made from the present invention is cheap, and the purity height is suitable for mass production.Detrimental impurity is few in the aluminum oxide made from the inventive method, and boron-containing quantity is low, so it is pure white to make the ceramic product color and luster, relatively, is its ceramic product of aluminum oxide pink slightly of additive with boride.
The ultra-fine low sodium alpha-type aluminum oxide made from the inventive method because fine size, so be the base substrate that raw material is made with it, is the base substrate of the goods of the aluminum oxide powder that makes of additive with boride more now, and firing temperature can reduce by 40～100 ℃.
The ultra-fine low sodium alpha-type aluminum oxide of producing with the inventive method is the main various base substrates of making, and plasticity-is good, and easy fracture not after the power by bending is suitable for making the goods of various complex contours very much.The ultra-fine alpha-type aluminum oxide of low sodium with the present invention's manufacturing, except being the lower alpha-type aluminum oxide of sodium oxide content, alpha-type aluminum oxide crystal grain in the particle is about about 1 micron, and in ball milling or behind comminution by gas stream, alumina particle is ground into 0.8～1.5 micron aluminum oxide fine particle easily.Because the aluminium oxide particles that the present invention makes is thin, so the ceramic product smooth surface of making is fit to be applied to make pipoint technique pottery, electroceramics, automobile ceramic engine parts etc.
Give an example 1: add sodium aluminum fluoride in the industrial aluminium hydroxide, its addition is 0.4% of an alumina weight, adds magnesium chloride again, and its addition is 0.2% of an alumina weight, mixing.Roasting in 1200 ℃ generates alpha-type aluminum oxide, and its grain fineness number is about 1 micron.
Give an example 2: commercial alumina, its sodium oxide content is 0.5%, adds to account for the aluminum fluoride of alumina weight 0.2% and 0.2% magnesium fluoride; Add the boron oxide that accounts for alumina weight 0.1% again, roasting in 1200 ℃ of retort furnaces, cooling back water flush away is the solubility sodium oxide wherein, and sodium oxide content promptly drops to 0.2～0.04% in the aluminum oxide.
Claims (9)
1, a kind of method with calcination aluminium hydroxide or the low ultra-fine alpha-type aluminum oxide of sodium of aluminum oxide manufacturing, feature of the present invention is that aluminum oxide or aluminium hydroxide are mixed mutually with additive fluorid, can not add or add a spot of boride and muriate.After its mixture roasting, sodium oxide content reduces in the product, and the alpha-type aluminum oxide crystal is very thin.This aluminum oxide is dried behind water or weak acid scrubbing, and its sodium oxide content can be reduced to 0.2～0.04%.It is easier to be ground into fine particle about 1 micron with comminution by gas stream or ball mill pulverizing method.
2, the method for claim 1, its raw material generally are industrial oxidation aluminium or aluminium hydroxide.But also can be aluminum oxide or the aluminium hydroxide that other method is produced.
3, the method for claim 1, the fluorochemical that is added are fluorochemical or other fluorochemicals of hydrogen fluoride, metal, and its addition is 0.03～0.4% of an alumina weight.
4, boride as claimed in claim 1 is boron oxide, boric acid or other boride, and its addition is 0～0.3% of an alumina weight.
5, muriate as claimed in claim 1 is muriate or other muriate of hydrogenchloride, metal, and its addition is 0～0.3% of an alumina weight.
6, the method for claim 1 is added muriate, 0～0.3% boride and 0～0.3% muriate, the mixing then that accounts for alumina weight 0.03～0.4% in aluminum oxide or aluminium hydroxide.
7, the method for claim 1, maturing temperature are in 1200～1500 ℃ of scopes, and its roasting time is 0.1～16 hour.
8, the method for claim 1, the sodium oxide in the roasting rear oxidation aluminium obviously reduce in case of necessity can also water or diluted acid and water embathe again, dry, make that sodium oxide further reduces in the product.
9, according to claim 1, the aluminum oxide after aluminum oxide after the roasting or the washing can be ground into ultra-fine low sodium alumina powder about 1 micron with alumina particle with comminution by gas stream, ball mill pulverizing or other method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN198585102281A CN85102281A (en) | 1985-04-01 | 1985-04-01 | The manufacture method of low-sodium 2-alumina of superfine grains |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN198585102281A CN85102281A (en) | 1985-04-01 | 1985-04-01 | The manufacture method of low-sodium 2-alumina of superfine grains |
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| CN85102281A true CN85102281A (en) | 1986-09-17 |
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| CN198585102281A Pending CN85102281A (en) | 1985-04-01 | 1985-04-01 | The manufacture method of low-sodium 2-alumina of superfine grains |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100390330C (en) * | 2006-09-21 | 2008-05-28 | 中国铝业股份有限公司 | Method for preparing flake alpha Al2O3 monocrystal grains at low temperature |
| CN102009993A (en) * | 2010-12-15 | 2011-04-13 | 中国铝业股份有限公司 | Method for preparing submicron aluminium oxide by two-stage roasting method |
| CN103145164A (en) * | 2013-04-08 | 2013-06-12 | 郑州玉发精瓷科技有限公司 | Preparation method of aluminum oxide powder for fine ceramics sintered at low temperature |
| CN103553095A (en) * | 2013-10-22 | 2014-02-05 | 襄阳市金控特种陶瓷科技有限公司 | Method for producing alpha-aluminum oxide fine crystal powder by adding growth inhibitor |
| CN104229844A (en) * | 2014-09-12 | 2014-12-24 | 广西平果铝朗琨科技有限公司 | Preparation method of superfine low-sodium alpha-alumina powder with high activity |
| CN106044809A (en) * | 2016-05-27 | 2016-10-26 | 兰州大学 | Preparation method of completely-dispersible alpha alumina nanoparticles |
| CN107935007A (en) * | 2017-11-27 | 2018-04-20 | 东北大学 | The method that after baking prepares alumina with high temperature and low sodium |
| CN109607584A (en) * | 2019-01-31 | 2019-04-12 | 东北大学 | A kind of preparation method of the ultralow sodium alumina powder material of high temperature |
| CN112341994A (en) * | 2020-12-20 | 2021-02-09 | 长沙县新光特种陶瓷有限公司 | Production method of ultra-precise polishing abrasive |
| CN114751435A (en) * | 2022-05-07 | 2022-07-15 | 西北工业大学 | Large-primary-crystal low-sodium spheroidal alpha-alumina powder and preparation method thereof |
| CN115073147A (en) * | 2022-06-28 | 2022-09-20 | 浙江自立新材料股份有限公司 | Preparation method of low-sodium and ultra-low-sodium tabular sintered corundum |
-
1985
- 1985-04-01 CN CN198585102281A patent/CN85102281A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100390330C (en) * | 2006-09-21 | 2008-05-28 | 中国铝业股份有限公司 | Method for preparing flake alpha Al2O3 monocrystal grains at low temperature |
| CN102009993A (en) * | 2010-12-15 | 2011-04-13 | 中国铝业股份有限公司 | Method for preparing submicron aluminium oxide by two-stage roasting method |
| CN103145164A (en) * | 2013-04-08 | 2013-06-12 | 郑州玉发精瓷科技有限公司 | Preparation method of aluminum oxide powder for fine ceramics sintered at low temperature |
| CN103145164B (en) * | 2013-04-08 | 2015-04-22 | 郑州玉发精瓷科技有限公司 | Preparation method of aluminum oxide powder for fine ceramics sintered at low temperature |
| CN103553095A (en) * | 2013-10-22 | 2014-02-05 | 襄阳市金控特种陶瓷科技有限公司 | Method for producing alpha-aluminum oxide fine crystal powder by adding growth inhibitor |
| CN104229844A (en) * | 2014-09-12 | 2014-12-24 | 广西平果铝朗琨科技有限公司 | Preparation method of superfine low-sodium alpha-alumina powder with high activity |
| CN106044809A (en) * | 2016-05-27 | 2016-10-26 | 兰州大学 | Preparation method of completely-dispersible alpha alumina nanoparticles |
| CN106044809B (en) * | 2016-05-27 | 2018-10-26 | 兰州大学 | A kind of preparation method being completely dispersed alpha-aluminium oxide nano particle |
| CN107935007A (en) * | 2017-11-27 | 2018-04-20 | 东北大学 | The method that after baking prepares alumina with high temperature and low sodium |
| CN109607584A (en) * | 2019-01-31 | 2019-04-12 | 东北大学 | A kind of preparation method of the ultralow sodium alumina powder material of high temperature |
| CN112341994A (en) * | 2020-12-20 | 2021-02-09 | 长沙县新光特种陶瓷有限公司 | Production method of ultra-precise polishing abrasive |
| CN114751435A (en) * | 2022-05-07 | 2022-07-15 | 西北工业大学 | Large-primary-crystal low-sodium spheroidal alpha-alumina powder and preparation method thereof |
| CN114751435B (en) * | 2022-05-07 | 2024-04-05 | 陕西水木旭昇新材料科技有限公司 | Large-primary-crystal low-sodium spheroid alpha-alumina powder and preparation method thereof |
| CN115073147A (en) * | 2022-06-28 | 2022-09-20 | 浙江自立新材料股份有限公司 | Preparation method of low-sodium and ultra-low-sodium tabular sintered corundum |
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