CN1394807A - Preparation method of high-purity superfine alumina powder body - Google Patents
Preparation method of high-purity superfine alumina powder body Download PDFInfo
- Publication number
- CN1394807A CN1394807A CN 02114666 CN02114666A CN1394807A CN 1394807 A CN1394807 A CN 1394807A CN 02114666 CN02114666 CN 02114666 CN 02114666 A CN02114666 A CN 02114666A CN 1394807 A CN1394807 A CN 1394807A
- Authority
- CN
- China
- Prior art keywords
- powder
- aluminium
- preparation
- aluminium hydroxide
- aluminum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The preparation method of high-purity superfine aluminium oxide powder body includes the following steps: melting aluminium in aluminium alloy melting heat-insulating furnace, using compressed air as atomization medium, and using deionized water as cooling medium to atomize aluminium liquor to obtain active aluminium powder paste body, concentrating to obtain concentrated aluminium powder paste body, adding aluminium hydroxide crystal seed whose concentration is 30-50% and grain size is 10-30 nm, making hydrolysis and reaction to produce aluminium hydroxide sol, drying at 110 deg.C to obtain aluminium hydroxide powder body, placing the power body in furnace, making phase conversion treatment for 2-4 hr. at 650-850 deg.c to obtain gamma-Al2O3 powder body, then making phase conversion treatment at 1100-1250 deg.c for 3-5 hr.
Description
Technical field
The invention belongs to the compound technical of aluminium, be specifically related to aluminum oxide.
Background technology
High-purity superfine alumina powder is meant that generally purity 〉=99.99%, granularity are positioned at micron or submicron order, and with its different purposes different specific requirements is arranged.The purposes of high-purity superfine alumina powder is very extensive, as is used to prepare high-pressure sodium fluorescent tube, fluorescent material, abrasive substance, artificial lens, hard mass or the like.
The method for preparing at present high-purity superfine alumina powder mainly contains exsiccated ammonium alum pyrolysis method, aluminium carbonate ammonium pyrolysis method, organoaluminum hydrolysis method, spark-discharge method, mercury chloride activated water solution, hydrothermal method and activated aluminum powder hydrolysis method etc.All to relate to aluminium be raw material to methods such as organoaluminum hydrolysis method, mercury chloride activated water solution, hydrothermal method and activated aluminum powder hydrolysis method in the aforesaid method, through certain processing again with the water reaction that is hydrolyzed, finally obtain alumina powder jointed.
Patent publication No. is that CN 1079718A, denomination of invention are the Chinese patent of " preparation method of controllable nanon size, submicron order aluminum oxide powder ", discloses the method for preparing high-purity superfine alumina powder.Mainly need utilize 0.5% mercuric chloride solution that fine aluminium sheet or bits are activated, put into the distilled water hydrolysis again, carry out drying, thermal treatment then, can obtain controllable nanon size, submicron order is alumina powder jointed.Its main drawback is to add mercury chloride in process of production, and mercury chloride is a kind of toxic substance, and this production method can only be at the experimental stage in the laboratory, and industrialness is produced very difficult, and unstable product quality, and yield rate is very low.
Patent publication No. is that CN 1286235A, denomination of invention are the Chinese patent of " preparation of high-purity super-fine metal oxide ceramic powder ", adopting purity is that 99.99% rafifinal is a raw material, melting on intermediate frequency furnace, be that atomizing medium atomizes on the chilling atomising unit then with nitrogen, obtain metallic aluminium powder, reaction immediately is hydrolyzed, 40～80 ℃ of temperature of reaction, 24 hours reaction times, the generation product is a pale powder, mean particle size＜0.5 μ m after drying, phase inversion are handled, purity is 99.95%.This process using nitrogen atomization, very high to the requirement of equipment, the generation product is a pale powder, and chemical reaction is incomplete, and the purity of product is not high.
Summary of the invention
Technical problem underlying to be solved by this invention and the technical scheme that solves its technical problem are that it comprises the steps:
(1) preparation activated aluminum powder slurry
Aluminum feedstock is placed the aluminum alloy melting holding furnace, heat 800～900 ℃ and make its fusing, with pressurized air is atomizing medium, with the deionized water is that heat-eliminating medium atomizes to aluminium liquid on the chilling atomising unit, get the activated aluminum powder slurry, its concentration is 1～2%, and control activated aluminum powder slurry temperature is lower than 25 ℃.
(2) preparation aluminum hydroxide sol
The activated aluminum powder slurry of step (1) preparation will be separated greater than 250 purpose meal in the aluminium powder slurry with method of sieving or settling process, 's 50～70% concentrated aluminium powder slurry with the vacuum filtration method with aluminium powder slurry simmer down to weight percent, placing temperature then is 85～95 ℃ deionized water, and add that concentration is 30～50%, granularity is the aluminium hydroxide crystal seed of 10～30nm, its proportion relation is:
Concentrate the aluminium powder slurry: deionized water: aluminium hydroxide crystal seed is 1: 2～4: 0.01～0.15
Hydrolysis 8～12 hours makes whole hydrolytic process temperature remain on 85～95 ℃ by heating in water bath, and reaction generates aluminum hydroxide sol, with settling process unreacted aluminium powder is separated and removes, and carries out filter dehydration again.
(3) drying of aluminium hydroxide powder
The moist powder of the aluminium hydroxide that step (2) is prepared descended dry 2～4 hours at 110 ℃, got the high pure and ultra-fine aluminium hydroxide powder.
(4) preparation is alumina powder jointed
The prepared aluminium hydroxide powder of step (3) is placed in the High Temperature Furnaces Heating Apparatus, under 650～850 ℃, carry out phase inversion and handled 2～4 hours, get high pure and ultra-fine γ-Al
2O
3Powder.
The prepared aluminium hydroxide powder of step (3) is placed in the High Temperature Furnaces Heating Apparatus, carry out phase inversion at 1100～1250 ℃ and handled 3～5 hours, get high-purity ultra-fine a-Al
2O
3Powder.
Compressed-air actuated pressure as atomizing medium of the present invention is 1.0～4.0MPa.
The particle diameter that is added in the step (2) is that the preparation method of 10～30nm aluminium hydroxide crystal seed is: the high purity aluminium hydroxide powder of taking Hydrothermal Preparation, place methanol solution, with ultrasonic dispersing 48～56 hours, placed 5～7 days, make larger particles and coacervate precipitation.Aluminium hydroxide crystal seed is miscible in top suspension, and suspension is concentrated into aluminium hydroxide content under 60 ℃ be 30～50%.
The present invention compares with other wet chemistry method, and anacidity, alkali, organism etc. participate in reaction, and product also has only aluminum oxide and hydrogen, does not have harmful liquid and noxious gas emission.The present invention compares with hydrothermal method, does not need high-temperature and high-pressure conditions, only needs be lower than the reaction that is hydrolyzed under 100 ℃, normal pressure, production safety, cost reduction.The present invention compares with the activated aluminum powder hydrolysis method, uses the special-purpose melting and heat preservation stove of aluminium alloy to melt, and guarantees that the purity of raw material is not contaminated in fusion process, guarantees purity＞99.99% of the finished product; Atomizing medium is a pressurized air, simplified technology, equipment and investment have been saved, the accurate control of processing condition by to powder by atomization the time, can guarantee that under the condition that with the air is medium passivation does not take place on the aluminium powder surface that generates, the hydrolysis reaction of back can be carried out smoothly, adding concentration in hydrolytic process is 30～50%, granularity is the aluminium hydroxide crystal seed of 10～30nm, make in the aluminium powder hydrolysis and form formation extension nucleation or epitaxy on the seed particles that is adding in the process of aluminum hydroxide crystals, can significantly reduce the activation energy of nucleation, quicken the hydrolysis process, hydrolysis reaction was finished in 8～12 hours; Hydrolysis reaction is thorough, and yield rate 〉=98%, gained powder are white powder.
The present invention have product purity height, yield rate height, simplified technology, saved equipment and investment, advantage such as the harmful liquid of nothing and noxious gas emission, production safety, production cost are low, can in preparation is alumina powder jointed, promote the use of.
Embodiment
The present invention is described in more detail below in conjunction with embodiment, but the invention is not restricted to these embodiment.
Embodiment 1:
With production product 100kg of the present invention is that the used raw material of example and proportioning and preparation method thereof are as follows:
(1) preparation activated aluminum powder slurry
With purity is that 99.993% aluminium ingot 55kg places the aluminum alloy melting holding furnace, be warmed to 860 ℃ and make its fusing, the pressurized air that with pressure is 2.5MPa is atomizing medium, with the deionized water is that heat-eliminating medium atomizes to aluminium liquid on the chilling atomising unit, get the activated aluminum powder slurry, its concentration is 1.5%.Control activated aluminum powder slurry temperature is lower than 25 ℃.Atomizing medium is a pressurized air, simplify technology, saved equipment and investment, the accurate control of processing condition can guarantee that under the condition that with the air is medium passivation does not take place on the aluminium powder surface that generates by to powder by atomization the time, and the hydrolysis reaction of back can be carried out smoothly.
(2) preparation aluminum hydroxide sol
The activated aluminum powder slurry of step (1) preparation will be separated greater than 250 purpose meal in the aluminium powder slurry with method of sieving or settling process, 's 60% concentrated aluminium powder slurry with the vacuum filtration method with aluminium powder slurry simmer down to weight percent, placing temperature then is 85～95 ℃ deionized water, and add that concentration is 30～50%, granularity is the aluminium hydroxide crystal seed of 10～30nm, its proportion relation is:
Concentrate the aluminium powder slurry: deionized water: aluminium hydroxide crystal seed is 1: 3: 0.1
Hydrolysis 10 hours makes whole hydrolytic process temperature remain on 85～95 ℃ by heating in water bath, and reaction generates aluminum hydroxide sol, with settling process unreacted aluminium powder is separated and removes, and carries out filter dehydration again.Add aluminium hydroxide crystal seed in the hydrolytic process, aluminium powder is formed on the seed particles that is adding in the process of aluminum hydroxide crystals in hydrolysis form extension nucleation or epitaxy, can significantly reduce the activation energy of nucleation, quicken the hydrolysis process, react more thorough, make final product yield rate height.Gained powder primary particle＜50nm, and mean particle size (D
50) be 1.34 μ m, be distributed between 0.4～4.3 μ m.
(3) drying of aluminium hydroxide powder
The moist powder of the aluminium hydroxide that step (2) is prepared descended dry 2～4 hours at 110 ℃, got the high pure and ultra-fine aluminium hydroxide powder;
(4) preparation is alumina powder jointed
The prepared aluminium hydroxide of step (3) is placed in the High Temperature Furnaces Heating Apparatus, under 750 ℃, carry out phase inversion and handled 3 hours, get high pure and ultra-fine γ-Al
2O
3Powder, its purity are 99.994%, and yield rate is 98%;
The prepared aluminium hydroxide powder of step (3) is placed in the High Temperature Furnaces Heating Apparatus, carry out phase inversion at 1200 ℃ and handled 4 hours, get high-purity ultra-fine a-Al
2O
3Powder, its purity are 99.994%, and yield rate is 98%.
Embodiment 2:
With production product 100kg of the present invention is that the used raw material of example and proportioning and preparation method thereof are as follows:
(1) preparation activated aluminum powder slurry
With purity is that 99.993% aluminium ingot 55kg places the aluminum alloy melting holding furnace, be warmed to 900 ℃ and make its fusing, the pressurized air that with pressure is 4MPa is atomizing medium, with the deionized water is that heat-eliminating medium atomizes to aluminium liquid on the chilling atomising unit, get the activated aluminum powder slurry, its concentration is 1%.Control activated aluminum powder slurry temperature is lower than 25 ℃.
(2) preparation aluminum hydroxide sol
The activated aluminum powder slurry of step (1) preparation will be separated greater than 250 purpose meal in the aluminium powder slurry with method of sieving or settling process, 's 50% concentrated aluminium powder slurry with the vacuum filtration method with aluminium powder slurry simmer down to weight percent, placing temperature then is 85～95 ℃ deionized water, and add that concentration is 30～50%, granularity is the aluminium hydroxide crystal seed of 10～30nm, its proportion relation is:
Concentrate the aluminium powder slurry: deionized water: aluminium hydroxide crystal seed is 1: 4: 0.15
Hydrolysis 8 hours makes whole hydrolytic process temperature remain on 85～95 ℃ by heating in water bath, and reaction generates aluminum hydroxide sol, with settling process unreacted aluminium powder is separated and removes, and carries out filter dehydration again;
(3) drying of aluminium hydroxide powder
The moist powder of the aluminium hydroxide that step (2) is prepared descended dry 2～4 hours at 110 ℃, got the high pure and ultra-fine aluminium hydroxide powder;
(4) preparation is alumina powder jointed
The prepared aluminium hydroxide of step (3) is placed in the High Temperature Furnaces Heating Apparatus, under 650 ℃, carry out phase inversion and handled 4 hours, get high pure and ultra-fine γ-Al
2O
3Powder;
The prepared aluminium hydroxide powder of step (3) is placed in the High Temperature Furnaces Heating Apparatus, carry out phase inversion at 1100 ℃ and handled 5 hours, get high-purity ultra-fine a-Al
2O
3Powder.
Embodiment 3:
With production product 100kg of the present invention is that the used raw material of example and proportioning and preparation method thereof are as follows:
(1) preparation activated aluminum powder slurry
With purity is that 99.993% aluminium ingot 55kg places the aluminum alloy melting holding furnace, be warmed to 800 ℃ and make its fusing, the pressurized air that with pressure is 1MPa is atomizing medium, with the deionized water is that heat-eliminating medium atomizes to aluminium liquid on the chilling atomising unit, get the activated aluminum powder slurry, its concentration is 2%.Control activated aluminum powder slurry temperature is lower than 25 ℃.
(2) preparation aluminum hydroxide sol
The activated aluminum powder slurry of step (1) preparation will be separated greater than 250 purpose meal in the aluminium powder slurry with method of sieving or settling process, 's 70% concentrated aluminium powder slurry with the vacuum filtration method with aluminium powder slurry simmer down to weight percent, placing temperature then is 85～95 ℃ deionized water, and to add concentration be that 30-50%, granularity are the aluminium hydroxide crystal seed of 10～30nm, and its proportion relation is:
Concentrate the aluminium powder slurry: deionized water: aluminium hydroxide crystal seed is 1: 2: 0.01
Hydrolysis 12 hours makes whole hydrolytic process temperature remain on 85～95 ℃ by heating in water bath, and reaction generates aluminum hydroxide sol, with settling process unreacted aluminium powder is separated and removes, and carries out filter dehydration again;
(3) drying of aluminium hydroxide powder
The moist powder of the aluminium hydroxide that step (2) is prepared descended dry 2～4 hours at 110 ℃, got the high pure and ultra-fine aluminium hydroxide powder;
(4) preparation is alumina powder jointed
The prepared aluminium hydroxide of step (3) is placed in the High Temperature Furnaces Heating Apparatus, under 850 ℃, carry out phase inversion and handled 4 hours, get high pure and ultra-fine γ-Al
2O
3Powder;
The prepared aluminium hydroxide powder of step (3) is placed in the High Temperature Furnaces Heating Apparatus, carry out phase inversion at 1250 ℃ and handled 5 hours, get high-purity ultra-fine a-Al
2O
3Powder.
The applicant adopts the γ-Al of the embodiment of the invention 1 preparation
2O
3Powder, α-Al
2O
3Powder third-party test unit has carried out the test of product foreign matter content with emission spectrometer, and test result sees Table 1.
Table 1 impurity in products content measuring is table as a result
| The name of an article | ????γ-Al 2O 3 | ????α-Al 2O 3 | |
| Purity is not less than % | ????99.994 | ????99.994 | |
| The high-content ppm of impurity | ????Na | ????8.2 | ????8.5 |
| ????Si | ????8 | ????8.4 | |
| ????Fe | ????5.6 | ????5.5 | |
| ????Cu | ????6 | ????6.2 | |
| ????Zn | ????5.4 | ????5.2 | |
| ????Ti | ????3.5 | ????3.3 | |
| Other every kind | ????6 | ????6 | |
| Summation | ????60 | ????60 | |
Claims (2)
1, a kind of preparation method of high-purity superfine alumina powder is characterized in that it comprises the steps:
(1) preparation activated aluminum powder slurry
Aluminum feedstock is placed the aluminum alloy melting holding furnace, heat 800～900 ℃ and make its fusing, with pressurized air is atomizing medium, with the deionized water is that heat-eliminating medium atomizes to aluminium liquid on the chilling atomising unit, get the activated aluminum powder slurry, its concentration is 1～2%, and control activated aluminum powder slurry temperature is lower than 25 ℃;
(2) preparation aluminum hydroxide sol
The activated aluminum powder slurry of step (1) preparation will be separated greater than 250 purpose meal in the aluminium powder slurry with method of sieving or settling process, 's 50～70% concentrated aluminium powder slurry with the vacuum filtration method with aluminium powder slurry simmer down to weight percent, placing temperature then is 85～95 ℃ deionized water, and add that concentration is 30～50%, granularity is the aluminium hydroxide crystal seed of 10～30nm, its proportion relation is:
Concentrate the aluminium powder slurry: deionized water: aluminium hydroxide crystal seed is 1: 2～4: 0.01～0.15
Hydrolysis 8～12 hours makes whole hydrolytic process temperature remain on 85～95 ℃ by heating in water bath, and reaction generates aluminum hydroxide sol, with settling process unreacted aluminium powder is separated and removes, and carries out filter dehydration again;
(3) drying of aluminium hydroxide powder
The moist powder of the aluminium hydroxide that step (2) is prepared descended dry 2～4 hours at 110 ℃, got the high pure and ultra-fine aluminium hydroxide powder;
(4) preparation is alumina powder jointed
The prepared aluminium hydroxide powder of step (3) is placed in the High Temperature Furnaces Heating Apparatus, under 650～850 ℃, carry out phase inversion and handled 2～4 hours, get high pure and ultra-fine γ-Al
2O
3Powder;
The prepared aluminium hydroxide powder of step (3) is placed in the High Temperature Furnaces Heating Apparatus, carry out phase inversion at 1100～1250 ℃ and handled 3～5 hours, get high-purity ultra-fine a-Al
2O
3Powder.
2, according to the preparation method of the described high-purity superfine alumina powder of claim 1, it is characterized in that: said compressed-air actuated pressure as atomizing medium is 1.0～4.0MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02114666 CN1198761C (en) | 2002-07-09 | 2002-07-09 | Preparation method of high-purity superfine alumina powder body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02114666 CN1198761C (en) | 2002-07-09 | 2002-07-09 | Preparation method of high-purity superfine alumina powder body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1394807A true CN1394807A (en) | 2003-02-05 |
| CN1198761C CN1198761C (en) | 2005-04-27 |
Family
ID=4743228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02114666 Expired - Fee Related CN1198761C (en) | 2002-07-09 | 2002-07-09 | Preparation method of high-purity superfine alumina powder body |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1198761C (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100430145C (en) * | 2004-07-12 | 2008-11-05 | 中国长城铝业公司 | Method for magnetic separating of aluminum and iron in high iron bauxite |
| CN101941727A (en) * | 2010-09-14 | 2011-01-12 | 李振亚 | Method for producing aluminum oxide powder used as a raw material for producing sapphire crystals by flame melt process |
| CN102107899A (en) * | 2011-01-11 | 2011-06-29 | 上海理工大学 | Preparation method of lamellar gamma-phase nano aluminum oxide |
| CN103614774A (en) * | 2013-12-13 | 2014-03-05 | 东莞市精研粉体科技有限公司 | Preparation method of doping raw material used for growing sapphire single crystal through pulling method or edge-defined film-fed method |
| CN103787395A (en) * | 2014-01-21 | 2014-05-14 | 江苏大学 | Method for preparing micron-sized ultra-high-purity aluminum oxide powder by virtue of full-process regulation control |
| CN104386723A (en) * | 2014-11-07 | 2015-03-04 | 南京福皓晶体材料科技有限公司 | Preparation method of high-purity aluminum oxide |
| CN105271339A (en) * | 2015-10-14 | 2016-01-27 | 南京长江工业炉科技有限公司 | Preparation method for rho-aluminium oxide binder |
| CN105345018A (en) * | 2015-10-13 | 2016-02-24 | 刘冠华 | Preparation method for micron-size activated aluminum powder and aluminum powder |
| CN106277003A (en) * | 2016-07-29 | 2017-01-04 | 刘冠华 | A kind of preparation method of high pure and ultra-fine nano-aluminum hydroxide |
| CN107245323A (en) * | 2017-01-10 | 2017-10-13 | 白鸽磨料磨具有限公司 | Production method of alumina abrasive and products thereof |
| CN107792871A (en) * | 2017-11-29 | 2018-03-13 | 山东聊城瑞利金属材料有限公司 | A kind of method that metallic aluminium hydrolysis prepares spherical high-purity ultra-fine alumina |
| CN107814403A (en) * | 2017-12-08 | 2018-03-20 | 中国科学院青海盐湖研究所 | One kind utilizes Al (OH)3Prepare Al2O3Method and Al2O3Powder |
| CN110256058A (en) * | 2019-06-10 | 2019-09-20 | 青海圣诺光电科技有限公司 | A kind of preparation method of crystalline ceramics high purity alumina powder |
| CN115196658A (en) * | 2022-05-18 | 2022-10-18 | 陕西煤业化工技术研究院有限责任公司 | High-purity alumina powder prepared rapidly through autocatalysis and preparation method |
| CN116102041A (en) * | 2023-01-30 | 2023-05-12 | 中铝山东有限公司 | Preparation method of low-sodium low-oil-absorption superfine aluminum hydroxide |
-
2002
- 2002-07-09 CN CN 02114666 patent/CN1198761C/en not_active Expired - Fee Related
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100430145C (en) * | 2004-07-12 | 2008-11-05 | 中国长城铝业公司 | Method for magnetic separating of aluminum and iron in high iron bauxite |
| CN101941727A (en) * | 2010-09-14 | 2011-01-12 | 李振亚 | Method for producing aluminum oxide powder used as a raw material for producing sapphire crystals by flame melt process |
| CN102107899A (en) * | 2011-01-11 | 2011-06-29 | 上海理工大学 | Preparation method of lamellar gamma-phase nano aluminum oxide |
| CN102107899B (en) * | 2011-01-11 | 2012-07-25 | 上海理工大学 | Preparation method of lamellar gamma-phase nano aluminum oxide |
| CN103614774A (en) * | 2013-12-13 | 2014-03-05 | 东莞市精研粉体科技有限公司 | Preparation method of doping raw material used for growing sapphire single crystal through pulling method or edge-defined film-fed method |
| CN103614774B (en) * | 2013-12-13 | 2016-06-15 | 东莞市精研粉体科技有限公司 | The preparation method growing the doped raw material of gem monocrystalline for czochralski method or EFG technique |
| CN103787395A (en) * | 2014-01-21 | 2014-05-14 | 江苏大学 | Method for preparing micron-sized ultra-high-purity aluminum oxide powder by virtue of full-process regulation control |
| CN103787395B (en) * | 2014-01-21 | 2015-09-02 | 江苏大学 | The method of micron order ultra high purity nitric oxide aluminium powder body is prepared in a kind of whole process regulation and control |
| CN104386723B (en) * | 2014-11-07 | 2016-03-02 | 南京福皓晶体材料科技有限公司 | A kind of preparation method of high-purity alpha-alumina |
| CN104386723A (en) * | 2014-11-07 | 2015-03-04 | 南京福皓晶体材料科技有限公司 | Preparation method of high-purity aluminum oxide |
| CN105345018A (en) * | 2015-10-13 | 2016-02-24 | 刘冠华 | Preparation method for micron-size activated aluminum powder and aluminum powder |
| CN105271339A (en) * | 2015-10-14 | 2016-01-27 | 南京长江工业炉科技有限公司 | Preparation method for rho-aluminium oxide binder |
| CN106277003A (en) * | 2016-07-29 | 2017-01-04 | 刘冠华 | A kind of preparation method of high pure and ultra-fine nano-aluminum hydroxide |
| CN107245323A (en) * | 2017-01-10 | 2017-10-13 | 白鸽磨料磨具有限公司 | Production method of alumina abrasive and products thereof |
| CN107792871A (en) * | 2017-11-29 | 2018-03-13 | 山东聊城瑞利金属材料有限公司 | A kind of method that metallic aluminium hydrolysis prepares spherical high-purity ultra-fine alumina |
| CN107814403A (en) * | 2017-12-08 | 2018-03-20 | 中国科学院青海盐湖研究所 | One kind utilizes Al (OH)3Prepare Al2O3Method and Al2O3Powder |
| CN110256058A (en) * | 2019-06-10 | 2019-09-20 | 青海圣诺光电科技有限公司 | A kind of preparation method of crystalline ceramics high purity alumina powder |
| CN115196658A (en) * | 2022-05-18 | 2022-10-18 | 陕西煤业化工技术研究院有限责任公司 | High-purity alumina powder prepared rapidly through autocatalysis and preparation method |
| CN115196658B (en) * | 2022-05-18 | 2023-11-21 | 陕西煤业化工技术研究院有限责任公司 | High-purity alumina powder prepared rapidly through self-catalysis and method |
| CN116102041A (en) * | 2023-01-30 | 2023-05-12 | 中铝山东有限公司 | Preparation method of low-sodium low-oil-absorption superfine aluminum hydroxide |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1198761C (en) | 2005-04-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1198761C (en) | Preparation method of high-purity superfine alumina powder body | |
| CN103962087B (en) | A kind of nano calcium oxide base CO of surface coating modification 2adsorbent and preparation method thereof | |
| CN109609123B (en) | Red/yellow dual-wavelength nitrogen and sulfur co-doped fluorescent carbon quantum dot and preparation and application thereof | |
| FR2868414A1 (en) | PROCESS FOR THE PRODUCTION OF PARTICULATE ALPHA-ALUMINA AND PARTICULATE APHA-ALUMINA PRODUCED BY THIS PROCESS | |
| CN1666956A (en) | Method for synthesizing nanometer size mordenite | |
| CN106045523B (en) | A kind of method based on Bayer process production aluminum nitride ceramic powder | |
| CN1100066A (en) | Process for producing alpha-alumina powder | |
| CN1579941A (en) | Method for preparing high-pruity alumina powder | |
| CN100384738C (en) | Preparation method of ultrafine alpha-Al2O3 powder and obtained product | |
| CN110272058B (en) | MCM-41 ordered mesoporous material and preparation method thereof | |
| CN101066773A (en) | Gas phase process of preparing nanometer alumina particle | |
| CN1052960C (en) | Process for producing crystalline microporous body | |
| CN115770590A (en) | Bi with interface defects 2 S 3 /ZnS composite photocatalyst and preparation method and application thereof | |
| CN1182037C (en) | Prepn of high-purity alumina | |
| CN1032585C (en) | Method for producing special titanium dioxide superfine powder | |
| CN113247940A (en) | Method for preparing neodymium oxide nanoparticles with small size by solid-phase sintering | |
| CN1699271A (en) | Method for preparing high-purity mullite at low temperature by mechanochemical process | |
| WO2021082338A1 (en) | Method for preparing metal oxide | |
| CN101786644B (en) | Sandy alumina preparation method | |
| CN110015676B (en) | Alumina material and preparation method thereof | |
| CN1234609C (en) | Process of producing high purify superfine aluminium oxide by industrial aluminium hydroxide | |
| CN109553121A (en) | A kind of preparation method of high-purity low-sodium aluminum hydroxide | |
| CN110227433B (en) | Anatase type TiO2Preparation method of crystal face heterojunction | |
| CN108727518B (en) | Process for the polymerization of ethylene and polyethylene | |
| CN1473762A (en) | Process for producing aluminium hydroxide using biological fermenting waste gas CO2 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |