Preparation of Al(OH)_3 by ion membrane electrolysis and precipitation of sodium aluminate solution with seeds  

作　　者：李元高 陈启元 王松森 尹周澜 张平民 

机构地区：[1]Department of Environmental Engineering,Xiamen University of Technology,Xiamen 361024,China,School of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China [2]School of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China

出　　处：《中国有色金属学会会刊：英文版》2008年第4期974-979,共6页Transactions of Nonferrous Metals Society of China

基　　金：Project(2005CB623702) supported by the National Basic Research Program of China

摘　　要：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.The preparation of AI（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 （αK） 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, AI（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.

关 键 词：铝酸钠 离子交换膜 电解 沉淀 氢氧化铝 制备方法 

分 类 号：TF821[冶金工程—有色金属冶金]