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A kind of preparation method of ultrafine ultrawhite aluminum hydroxide micropowder

An aluminum hydroxide and micropowder technology, applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problems affecting the application of micropowder aluminum hydroxide and the unsatisfactory whiteness of micropowder aluminum hydroxide, and achieve whiteness. Narrowing the degree range, narrowing the particle size range, avoiding the effect of fast and slow

Active Publication Date: 2021-03-16
贵州博汇联润铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It can be seen that in the current production process of aluminum hydroxide micropowder, it is necessary to disperse and classify the prepared micropowder aluminum hydroxide to realize the preparation of micropowder aluminum hydroxide, and the whiteness of micropowder aluminum hydroxide is still not ideal. Affected the application of micropowder aluminum hydroxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A sodium aluminate solution containing 160g / L of alumina is used as the raw material for the preparation of micropowdered aluminum hydroxide; 0.0001 times the weight of the active seed solution is added to obtain a mixed solution; the active seed solution is made of aluminum hydroxide and water in an equal mass ratio Mix and operate according to the cell mill operation method, and after 1.2h of grinding, an aluminum hydroxide solution with a particle size of 1.8 μm and a concentration of 330 g / L is obtained, and the caustic ratio of the aluminum hydroxide solution is 0;

[0024] Pour the above mixed solution into the crystallization reactor, and through the six-point distribution method, circulate the mixed solution in the crystallization reactor and mix evenly. Wash with water at 70°C to obtain ultra-fine ultra-white aluminum hydroxide micropowder.

Embodiment 2

[0026] Adopt the sodium aluminate solution that contains aluminum oxide 180g / L as the raw material that micropowder aluminum hydroxide prepares; Add the active seed crystal solution of 0.003 times of weight, obtain mixed solution; Active seed crystal solution is that aluminum hydroxide and embodiment 1 are washed The back liquid is mixed according to the equal mass ratio, operated according to the cell mill operation method, and after 2.8 hours of grinding, an aluminum hydroxide solution with a particle size of 2.2 μm and a concentration of 380 g / L is obtained. The caustic ratio of the aluminum hydroxide solution is 0.3 ;

[0027] The above mixed solution is injected into the crystallization reactor, and through the six-point distribution method, the mixed solution is circulated in the crystallization reactor and mixed uniformly, and the temperature of the mixed solution is controlled at 70°C for 14 hours, and the crystals are collected and filtered. Wash with water at 90°C to...

Embodiment 3

[0029] Adopt the sodium aluminate solution that contains aluminum oxide 170g / L as the raw material that micropowder aluminum hydroxide prepares; Add the active seed crystal solution of 0.0015 times of weight, obtain mixed solution; Active seed crystal solution is that aluminum hydroxide and embodiment 1 are washed The back liquid was mixed according to the equal mass ratio, operated according to the cell mill operation method, and after 1.7h of grinding, an aluminum hydroxide solution with a particle size of 1.9 μm and a concentration of 350 g / L was obtained, and the caustic ratio of the aluminum hydroxide solution was 1.2 ;

[0030] Pour the above mixed solution into the crystallization reactor, and through the six-point distribution method, circulate the mixed solution in the crystallization reactor and mix evenly, control the temperature of the mixed solution at 60°C and circulate the distribution for 13 hours, collect crystals, filter, and use temperature Wash with water a...

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Abstract

The invention relates to the technical field of preparation of aluminum hydroxide, in particular to a preparing method of superfine super-white aluminum hydroxide micropowder. The method includes thesteps of injecting a sodium aluminate solution into a crystallizing reactor, arranging six feeding pipes in the crystallizing reactor, forming a discharge port in the bottom of the crystallizing reactor, arranging a material distributing groove in the top end of the crystallizing reactor, making the six feeding pipes communicated with the bottom of the material distributing groove, making the discharge port communicated with the top end of the material distributing groove through a circulating pump, and making the six feeding pipes evenly distributed on the top edge of the crystallizing reactor and incline towards the center of the crystallizing reactor by 5-60 degrees so that materials in the crystallizing reactor can be cyclically distributed at multiple angles and the sodium aluminate solution can be evenly distributed after the multi-angle material distribution of the feeding pipes. The particle size range of the obtained aluminum hydroxide micropowder is narrowed, the whiteness variation range is greatly narrowed, the whiteness is improved, and the quality of the aluminum hydroxide micropowder is improved.

Description

technical field [0001] The invention relates to the technical field of aluminum hydroxide preparation, in particular to a method for preparing ultrafine ultrawhite aluminum hydroxide micropowder. Background technique [0002] Aluminum hydroxide micropowder is widely used in flame retardant, filler and other fields; currently, the preparation of aluminum hydroxide micropowder is obtained by decomposing sodium aluminate solution to obtain aluminum hydroxide slurry, which is then separated by a filter and washed twice with hot water. , for example, Patent No. 201610171923.2 discloses the use of carbonated sodium aluminate solution to obtain aluminum hydroxide seed crystals and add them to the sodium aluminate solution, and decompose the seeds at different temperatures to obtain decomposed slurry, iron removal, depolymerization, and removal of Moisture, dispersed and graded to obtain micropowder aluminum hydroxide; carbonation treatment was carried out in the temperature range o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/14
CPCC01F7/14C01P2004/62C01P2006/65
Inventor 刘俊良刘荣心刘权姚亮
Owner 贵州博汇联润铝业有限公司
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