Method for preparing aluminum hydroxide micro-powder with low oil absorption rate

A technology of aluminum hydroxide and ultra-fine aluminum hydroxide, which is applied in the direction of preparation of alkali metal aluminate/alumina/aluminum hydroxide, can solve the problems of different properties of ultra-fine aluminum hydroxide products, and achieve simple and easy operation OK, the effect is obvious, and the effect of product quality improvement

Inactive Publication Date: 2012-02-01
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0011] All the raw materials for the above inventions are sodium aluminate solutions, b...

Method used

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  • Method for preparing aluminum hydroxide micro-powder with low oil absorption rate
  • Method for preparing aluminum hydroxide micro-powder with low oil absorption rate
  • Method for preparing aluminum hydroxide micro-powder with low oil absorption rate

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Embodiment 1

[0021] Such as figure 1 As shown, in the process flow diagram provided by the embodiment of the present invention, the sodium aluminate solution obtained by the alkali-lime sintering method is used as a raw material, its alumina content is 110g / l, and the caustic ratio of the solution is a k 1.4, add the ground aluminum hydroxide active seed crystal, the particle size D50 is 1-5 microns, decompose the seed at 50°C for 8 hours, and then perform aging decomposition at 75°C for 8 hours , The resulting decomposed slurry is directly subjected to liquid-solid separation, washing and drying to obtain aluminum hydroxide micropowder with an oil absorption rate of 33ml / 100g, and its chemical composition analysis is shown in Table 1.

Embodiment 2

[0023] The sodium aluminate solution obtained by the alkali-lime sintering method is used as raw material, the alumina content is 100g / l, and the caustic ratio of the solution is a k 1.5, add the ground active seed crystals, decompose the seeds at 55°C for 24 hours, then aging and decompose at 75°C for 8 hours, and the decomposed slurry is directly subjected to liquid-solid separation and washing And dry, obtain the aluminum hydroxide micropowder oil absorption rate 34ml / 100g, its chemical composition analysis is shown in Table 1.

Embodiment 3

[0025] The sodium aluminate solution obtained by the alkali-lime sintering method is used as raw material, the alumina content is 110g / l, and the caustic ratio of the solution is a k 1.5, add the ground active seed crystals, decompose the seeds at 60°C for 24 hours, then aging and decompose at 90°C for 6 hours, and the decomposed slurry is directly subjected to liquid-solid separation and washing And dry, obtain the aluminum hydroxide micropowder oil absorption rate 32ml / 100g, its chemical composition analysis is shown in Table 1.

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Abstract

The invention provides a method for preparing aluminum hydroxide micro-powder with a low oil absorption rate, which comprises the following steps of: taking a sodium aluminate solution as a raw material, adding a ground active seed crystal to the raw material, sorting and decomposing ultrathin aluminum hydroxide pulp, continuously heating the ultrathin aluminum hydroxide pulp for aging and decomposition, and then drying to obtain the aluminum hydroxide micro-powder with a low oil absorption rate. Sequential decomposition and aging are increased on the basis of the original technical processes for preparing the aluminum hydroxide micro-powder with the sodium aluminate solution, and the prepared aluminum hydroxide micro-powder has a low oil absorption rate and a high extrusion speed. The operation process is simple and feasible, and the product quality is obviously improved.

Description

technical field [0001] The invention relates to a production method of aluminum hydroxide micropowder, in particular to a method for preparing aluminum hydroxide micropowder with low oil absorption rate. Background technique [0002] There are many methods for producing ultra-fine aluminum hydroxide, and the relevant domestic patent documents include: [0003] (1) A preparation method of aluminum hydroxide micropowder, application number: CN200610152795.3, a preparation method of aluminum hydroxide micropowder, relates to a production process of aluminum hydroxide micropowder used as flame retardant filler, especially A process method for improving the perfection degree of aluminum hydroxide micropowder crystals. The sodium aluminate solution was passed through CO 2 The gel seeds prepared by the carbon separation method and the neutralization method of sodium aluminate solution and aluminum sulfate are converted into pure-phase α-type aluminum hydroxide micropowder through...

Claims

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Application Information

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IPC IPC(8): C01F7/14
Inventor 许智芳李广战张蕾王科张新峰
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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