Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 18    No. 4    August 2008

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Preparation of Al(OH)3 by ion membrane electrolysis and precipitation of sodium aluminate solution with seeds
LI Yuan-gao(李元高)1, 2, CHEN Qi-yuan(陈启元)2, WANG Song-sen(王松森)2,
YIN Zhou-lan(尹周澜)2, ZHANG Ping-min(张平民)2

1. Department of Environmental Engineering, Xiamen University of Technology, Xiamen 361024, China;
2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Abstract: The preparation of Al(OH)3 by the ion exchange membrane electrolysis followed by the precipitation of sodium aluminate solution with seeds was made. During the process of ion membrane electrolysis, the sodium aluminate solution is rapidly acidified and the caustic ratio (aK) is decreased due to oxygen evolution in the anodic region. And the causticity of solution is increased due to hydrogen evolution in the cathode region, producing the high concentration of caustic soda solution. Regulating the acidity of the anodic solution by controlling the electric quantity in the electrolysis and subsequent decomposing the solution, Al(OH)3 could yield with very large rate and high efficiency. The experiments also indicate that the quality of aluminum hydroxide product is greatly affected by the impurity silicon.

 

Key words: sodium aluminate solution; ion exchange membrane; electrolysis and precipitation with seeds; silicon

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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