Activity coefficient calculation model for NaAl(OH)_4-NaOH-H_2O system  

作　　者：李小斌 吕卫君 刘桂华 彭志宏 周秋生 孟芸 任万能 

机构地区：[1]School of Metallurgical Science and Engineering,Central South University

出　　处：《中国有色金属学会会刊：英文版》2005年第4期908-912,共5页Transactions of Nonferrous Metals Society of China

基　　金：Project(50274076) supported by the National Natural Science Foundation of China ;project(G1999064910) supported bythe National Basic Research Programof China

摘　　要：Resorting to Debye-Hückel equation, the conception of the apparent dielectric constant ε′ of sodium aluminate solution is introduced. By supposing that all the influences are attributed to it, ε′ is successfully related to caustic ratio αK, concentration mNaOH, T and temperature T. Then an activity coefficient calculation model for NaAl（OH）4-NaOH-H2O system from 25℃ to 100℃ is established, which can be used in much wider αK and mNaOH, T ranges than those covered by the equilibrium solubility data.Resorting to Debye-Hueckel equation, the conception of the apparent dielectric constant ε＇ of sodium aluminate solution is introduced. By supposing that all the influences are attributed to it, ε＇ is successfully related to caustic ratio αK, concentration mNaOH.τ and temperature T. Then an activity coefficient calculation model for NaAl（OH）4-NaOH-H2O system from 25 ℃ to 100 ℃ is established, which can be used in much wider αK and mNaOH.τ ranges than those covered by the equilibrium solubility data.

关 键 词：NaAl(OH)4-NaOH-H2O 计算模型 活动系数 平衡性 绝缘体 冶炼工艺 

分 类 号：TG172[金属学及工艺—金属表面处理]