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Method for preparing beta-type aluminum hydroxide

A technology of aluminum hydroxide and aluminum oxide, which is applied in the field of preparation of β-type aluminum hydroxide, can solve the problems of low concentration of aluminum oxide in sodium aluminate solution, difficulty in product particle size control, and complicated decomposition system, so as to facilitate industrial implementation, The operation process is easy to master and the production process is simple

Inactive Publication Date: 2008-05-21
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this scheme, the concentration of alumina in the sodium aluminate solution is not high, the decomposition rate is low, the decomposition system is relatively complicated, and the particle size of the product is difficult to control

Method used

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  • Method for preparing beta-type aluminum hydroxide
  • Method for preparing beta-type aluminum hydroxide

Examples

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Embodiment 1

[0018] Sodium aluminate refined solution obtained by soda lime sintering method, its composition is alumina content 110g / l, αk1.44, dilute with distilled water to alumina content 50.3g / l, add 7kg / m 3 β-type aluminum hydroxide seeds of the solution, particle size d of β-type aluminum hydroxide seeds 50 2.5μm, through the concentration of 36% carbon dioxide gas, ventilation speed of 40m 3 / hour·m 3 solution, decompose for 70 minutes, the decomposition rate is 90%, and the decomposed slurry is subjected to liquid-solid separation, washing and drying to obtain β-type aluminum hydroxide with a purity of 99.0% and a specific surface area of ​​445m 2 / g, d 50 is 25.6 μm, and its physical and chemical results are shown in Table 1.

Embodiment 2

[0020] Sodium aluminate refined solution obtained by soda lime sintering method, its composition is alumina content 110g / l, αk1.44, dilute with distilled water to alumina content 50.3g / l, add 1kg / m 3 β-type aluminum hydroxide seeds of the solution, particle size d of β-type aluminum hydroxide seeds 50 0.5μm, through the concentration of 36% carbon dioxide gas, the ventilation speed is 30m 3 / hour·m 3 solution, decompose for 90 minutes, the decomposition rate is 93%, and the decomposed slurry is subjected to liquid-solid separation, washing and drying to obtain β-type aluminum hydroxide with a purity of 94.4% and a specific surface area of ​​485m 2 / g,d 50 is 31.8 μm, and its physical and chemical results are shown in Table 1.

Embodiment 3

[0022] Sodium aluminate refined solution obtained by soda lime sintering method, its composition is alumina content 110g / l, αk1.44, dilute with distilled water to alumina content 50.3g / l, add 4kg / m 3 β-type aluminum hydroxide seeds of the solution, particle size d of β-type aluminum hydroxide seeds 50 10.6μm, through the concentration of 36% carbon dioxide gas, ventilation speed of 40m 3 / hour·m 3 solution, decompose for 70 minutes, the decomposition rate is 90%, and the decomposed slurry is subjected to liquid-solid separation, washing and drying to obtain β-type aluminum hydroxide with a purity of 92.2% and a specific surface area of ​​386m 2 / g,d 50 is 38.6 μm, and its physical and chemical results are shown in Table 1.

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Abstract

The invention relates to a preparation method of Beta-type aluminum hydroxide, which is used for preparing the Beta-type aluminum hydroxide. Sodium aluminate solution is used as raw material, neutralized by feeding carbon dioxide and then is treated with filtering washing and drying to obtain the Beta-type aluminum hydroxide product. The preparation method is characterized in that Beta-type aluminum hydroxide seeds are added before the carbon dioxide is fed so as to produce the Beta-type aluminum hydroxide product with high purity and large specific surface area; in addition, the method has simple production technology, easy control of particle size and easy manipulation of the operation process.

Description

technical field [0001] The invention relates to a preparation method of β-type aluminum hydroxide, which is used for producing β-type aluminum hydroxide. Background technique [0002] There are many production methods for β-type aluminum hydroxide, and the relevant domestic patent documents include: [0003] The preparation method of β-type aluminum hydroxide with the application number 90105317.1, the alumina content of sodium aluminate refined solution is controlled to 35-45g / l, carbon dioxide gas is introduced at 35-45°C for neutralization, and the gas introduction rate is 30-45g / l. 50m 3 / hour·m 3 solution, the aeration time is 60-70 minutes, the decomposition product is aged at 70-100°C for 1-6 hours, and after filtration, washing and drying, the β-type aluminum hydroxide product is finally obtained, and its purity reaches 70-80%. Surface 200m 2 / g or so. In this scheme, the concentration of alumina in the sodium aluminate solution is not high, it needs to be aged,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14
Inventor 张蕾王世全苏爱玲栾福森王智锦
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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