Process for producing aluminium hydroxide

A technology of aluminum hydroxide and alumina, applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problems of low decomposition rate and decomposition rate, affecting decomposition efficiency, complex process equipment, etc. The effect of shortening the decomposition time, increasing the decomposition rate and rate, and eliminating the evaporation process

Inactive Publication Date: 2006-06-28
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Abstract
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AI Technical Summary

Problems solved by technology

Huge seed tanks must be used, the process equipment is complicated, and the decomposition rate and decomposition rate are not high, which affects the decomposition efficiency

Method used

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  • Process for producing aluminium hydroxide

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Effect test

Embodiment 1

[0032] The caustic concentration is 145g / l, α K 1.50 Bayer method semen, the ion membrane used is the Nafion cation exchange membrane produced by DuPont Company for ion membrane electrolysis, and the current density is 1.0A / dm 2 After energizing for 2 hours, introduce the seed crystal decomposition tank, add the seed crystal with a seed crystal ratio of 0.1 in the decomposition tank to carry out the Bayer process, and after 12 hours of decomposition, the alumina decomposition rate is 60%.

Embodiment 2

[0034] The caustic concentration is 155g / l, α K The Bayer method semen of 2.00, the ion membrane used is the Nafion cation exchange membrane produced by DuPont Company for ion membrane electrolysis, and the current density is 10.0A / dm 2 After energizing for 4 hours, introduce the seed crystal decomposition tank, add the seed crystal seed ratio of 3.0 in the decomposition tank to carry out the Bayer process, after 4 hours of decomposition, the decomposition rate of aluminum oxide is 70%.

Embodiment 3

[0036] The caustic concentration is 165g / l, α K The Bayer method semen of 1.70, the ionic membrane used is the Nafion cation exchange membrane produced by DuPont Company for ionic membrane electrolysis, and the current density is 5.0A / dm 2 After energizing for 4 hours, introduce the seed crystal decomposition tank, add the seed crystal seed ratio of 2.0 in the decomposition tank to carry out the Bayer process, after 8 hours of decomposition, the alumina decomposition rate is 65%.

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Abstract

A process for preparing aluminum hydroxide from sodium aluminate solution by electrolysis includes such steps as adding sodium aluminate slurry into the electrolyzer with anode made of Ti, cathode made of Ni or stainless steel and Na ion membrane, electrolyzing, adding crystal seeds to the solution in anode region to preare aluminum hydroxide, and using the solution in cathode region to extract from ore. The high-purity H2 and O2 can be also generated and used for H-O fuel battery.

Description

technical field [0001] The present invention relates to a production method of alumina, and relates to a method for producing aluminum hydroxide by decomposing sodium aluminate solution, especially adopting ion membrane electrolysis to rapidly acidify sodium aluminate solution to realize crystal agglomeration and growth of aluminum hydroxide Methods. Background technique [0002] The method of decomposing sodium aluminate solution to produce aluminum hydroxide generally adopts Bayer method for seed separation or sintering method for carbon separation. For ores with a high aluminum-silicon ratio, after high-temperature and high-pressure dissolution, the impurities in them are removed through dilution, sedimentation and separation processes, and the refined sodium aluminate solution is obtained. The process of adding aluminum hydroxide as a seed crystal to promote the precipitation of aluminum hydroxide is Bayer. The low-aluminum-silicon ratio ore is sintered by batching, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14
Inventor 李旺兴陈启元杨巧芳张平民赵清杰尹周澜黄海波谭军
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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