CN102992366A - Process method for preparing aluminum hydroxide micropowder - Google Patents
Process method for preparing aluminum hydroxide micropowder Download PDFInfo
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- CN102992366A CN102992366A CN201210467079XA CN201210467079A CN102992366A CN 102992366 A CN102992366 A CN 102992366A CN 201210467079X A CN201210467079X A CN 201210467079XA CN 201210467079 A CN201210467079 A CN 201210467079A CN 102992366 A CN102992366 A CN 102992366A
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- aluminum hydroxide
- seed
- sodium aluminate
- aluminate solution
- hydroxide powder
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Abstract
The invention discloses a process method for preparing aluminum hydroxide micropowder and belongs to a method for preparing the aluminum hydroxide micropowder. In the method, the seed crystal dosage is small, the cost is low, and the product granularity is controllable. The method comprises the following steps of: adding active seed crystals with the weight being 0.01-0.05 time that of a sodium aluminate solution in the sodium aluminate solution, and uniformly stirring for 6-8 hours under the temperature being 50-80 DEG C so as to obtain seed slurry, wherein the active seed crystals are the aluminum hydroxide micropowder with the granularity being 3.6-8.3 micrometers and the Na2O content being 0.3-1%; mixing the seed slurry with the sodium aluminate solution, so as to obtain a mixed solution, wherein the seed slurry accounts for 0.1-0.5% the weight of the mixed solution; and stirring the mixed solution by using a micro-disturbance plug flow crystallization reactor under the temperature being 40-80 DEG C for 8-48 hours, and collecting crystallized aluminum hydroxide micropowder. The aluminum hydroxide micropowder prepared by using the method has the advantages of being low in cost, fine in particles, high in grade and the like.
Description
Technical field
The present invention relates to a kind of method for preparing fine aluminum hydroxide powder, relate in particular to a kind of method of utilizing the sodium aluminate solution reaction decomposes to prepare fine aluminum hydroxide powder.
Background technology:Fine aluminum hydroxide powder is widely used in the industries such as fire-retardant and filler.Its preparation method mainly contains three kinds at present: a kind of is that technical grade volume particle size aluminium hydroxide is carried out the physics fragmentation, and obtaining granularity is the product of 5-20 μ m; Two kinds be directly take fine aluminum hydroxide powder as seed and sodium aluminate solution reaction directly decompose and produce fine aluminum hydroxide powder, the method requires the fine aluminum hydroxide powder grain weight large, the fine aluminum hydroxide powder particle size range of output is wide, thickness is inhomogeneous; Three kinds is to adopt various acid (wherein also comprising carbonic acid gas) and sodium aluminate solution neutralization reaction to generate aluminium glue, and then the aging fine aluminum hydroxide powder seed that generates is produced fine aluminum hydroxide powder with this seed and sodium aluminate solution reaction decomposes again; This technique digestion time is long, need take large measuring tank tank, energy-output ratio is large, and production of hybrid seeds neutralization reaction is brought a large amount of acid group impurity to Sodium Aluminate Solution System.
Summary of the invention:For the defects that exists in the prior art, the present invention aims to provide the fine aluminum hydroxide powder process of preparing that a kind of amount of seed is few, cost is low, product granularity is controlled.
To achieve these goals, the present invention is by the following technical solutions:
1) add the active seed of 0.01～0.05 times of weight in sodium aluminate solution, uniform stirring is 6～8 hours under 50～80 ℃ of conditions, gets the seed slurry; Described active seed is that granularity is 3.6～8.3 μ m, Na
2O content is 0.3～1% fine aluminum hydroxide powder, and the alumina content in the described sodium aluminate solution is 120～150 grams per liters;
2) above-mentioned seed slurry is mixed with above-mentioned sodium aluminate solution, get mixed solution; Under 40～80 ℃ of conditions, stir this mixed solution 8～48 hours with the moving plug flow crystallization reactor of perturbation, collect the fine aluminum hydroxide powder of crystallization; Wherein, the seed slurry accounts for 0.1～0.5% of described mixed solution weight.
Compared with the prior art, the present invention is owing to having adopted two-step approach to prepare fine aluminum hydroxide powder, and utilized the moving plug flow crystallization reactor of perturbation to control reaction process, therefore can control decomposition aluminium hydroxide form out by the liquid flow pattern of controlling in this reactor, thereby produce satisfactory crystal morphology.Moreover, the seed of the fine aluminum hydroxide powder that the inventive method adopts (fine aluminum hydroxide powder) consumption only adds 1/10th (the conventional aluminum acid sodium solution adds 0.1～0.5 times of weight that the required seed of crystal seed reaction method for preparing is sodium aluminate solution) of the required seed of crystal seed reaction method for preparing for the conventional aluminum acid sodium solution, cost is low; Prepared fine aluminum hydroxide powder granularity can reach 0.5～5 μ m, and product hierarchy is high.
Embodiment:The invention will be further described below in conjunction with specific embodiment:
Embodiment 1
1) 0.05 times heavy of adding, granularity are the active seed of 8.3 μ m in sodium aluminate solution, and uniform stirring is 6 hours under 80 ℃ temperature, gets the seed slurry;
2) get sodium aluminate solution 999Kg and mix with above-mentioned seed slurry 1Kg, stirred 8 hours under 40 ℃ temperature with the moving plug flow crystallization reactor of perturbation, can collect the fine aluminum hydroxide powder that mean particle size is 0.58 μ m; This fine aluminum hydroxide powder is the hexagonal plate crystal.
Embodiment 2
1) 0.01 times heavy of adding, granularity are the active seed of 3.6 μ m in sodium aluminate solution, and uniform stirring is 8 hours under 50 ℃ temperature, gets the seed slurry;
2) get sodium aluminate solution 995Kg and mix with above-mentioned seed slurry 5Kg, stirred 48 hours under 80 ℃ temperature with the moving plug flow crystallization reactor of perturbation, can collect the fine aluminum hydroxide powder that mean particle size is 4.8 μ m; This fine aluminum hydroxide powder is hexagonal prismoid shape crystal.
In the various embodiments described above, the alumina content in the sodium aluminate solution is 120～150 grams per liters, and described active seed is Na
2O content is 0.3～1% fine aluminum hydroxide powder.
Claims (1)
1. fine aluminum hydroxide powder process of preparing is characterized in that method is as follows:
1) add the active seed of 0.01～0.05 times of weight in sodium aluminate solution, uniform stirring is 6～8 hours under 50～80 ℃ of conditions, gets the seed slurry; Described active seed is that granularity is 3.6～8.3 μ m, Na
2O content is 0.3～1% fine aluminum hydroxide powder, and the alumina content in the described sodium aluminate solution is 120～150 grams per liters;
2) above-mentioned seed slurry is mixed with above-mentioned sodium aluminate solution, get mixed solution; Under 40～80 ℃ of conditions, stir this mixed solution 8～48 hours with the moving plug flow crystallization reactor of perturbation, collect the fine aluminum hydroxide powder of crystallization; Wherein, the seed slurry accounts for 0.1～0.5% of described mixed solution weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210467079XA CN102992366A (en) | 2012-11-19 | 2012-11-19 | Process method for preparing aluminum hydroxide micropowder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210467079XA CN102992366A (en) | 2012-11-19 | 2012-11-19 | Process method for preparing aluminum hydroxide micropowder |
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| CN102992366A true CN102992366A (en) | 2013-03-27 |
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| CN201210467079XA Pending CN102992366A (en) | 2012-11-19 | 2012-11-19 | Process method for preparing aluminum hydroxide micropowder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104671266A (en) * | 2013-11-28 | 2015-06-03 | 北京阳光欣禾科技有限公司 | Process for preparing ultrafine aluminum hydroxide by seed crystal precipitation method |
| CN104817100A (en) * | 2015-04-15 | 2015-08-05 | 中南大学 | Method for preparing sand-shaped aluminum oxide |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080082751A (en) * | 2007-03-09 | 2008-09-12 | 케이씨 주식회사 | Manufacturing method of ultra fine aluminum hydroxide |
| CN102515224A (en) * | 2011-12-14 | 2012-06-27 | 河津市晋铝大株化工有限公司 | Method for producing aluminum hydroxide powder |
| CN102583474A (en) * | 2012-01-20 | 2012-07-18 | 贵州省新材料研究开发基地 | Process method for producing aluminum hydroxide by seed decomposition of supersaturated sodium aluminate solution |
-
2012
- 2012-11-19 CN CN201210467079XA patent/CN102992366A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080082751A (en) * | 2007-03-09 | 2008-09-12 | 케이씨 주식회사 | Manufacturing method of ultra fine aluminum hydroxide |
| CN102515224A (en) * | 2011-12-14 | 2012-06-27 | 河津市晋铝大株化工有限公司 | Method for producing aluminum hydroxide powder |
| CN102583474A (en) * | 2012-01-20 | 2012-07-18 | 贵州省新材料研究开发基地 | Process method for producing aluminum hydroxide by seed decomposition of supersaturated sodium aluminate solution |
Non-Patent Citations (2)
| Title |
|---|
| 《轻金属》 20021231 林齐等 "二段中分发生产超细氢氧化铝微粉" 第15-17页 1 , 第10期 * |
| 林齐等: ""二段中分发生产超细氢氧化铝微粉"", 《轻金属》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104671266A (en) * | 2013-11-28 | 2015-06-03 | 北京阳光欣禾科技有限公司 | Process for preparing ultrafine aluminum hydroxide by seed crystal precipitation method |
| CN104817100A (en) * | 2015-04-15 | 2015-08-05 | 中南大学 | Method for preparing sand-shaped aluminum oxide |
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Application publication date: 20130327 |