五元体系Li^+/Cl^-,CO_3^(2-),SO_4^(2-),B_4O_7^(2-)-H_2O298K相关系实验研究  

An Experimental Study on Phase Equilibrium of QuinarySystem Li^+/Cl^-,CO_3^(2-),SO_4^(2-),B_4O_7^(2-)-H_2O298K

作　　者：曾英[1] 何雪涛[1] 殷辉安[1] 

机构地区：[1]成都理工大学化学化工系,成都610059

出　　处：《无机化学学报》2004年第8期946-950,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金资助项目(No.49773200)。

摘　　要：Zabuye saline lake, Tibet, China, is unrivalled in the world for its high concentration of chloride, sulfate, carbonate and borate of lithium, sodium and potassium. Always at the later stage of the evaporation of brines, most sodium and potassium salts are crystallized out, so the main components of brines can be described with the Li+, Mg2+/Cl-, SO42-, CO32-, B4O72--H2O system. As a part of study on the equilibrium of this complex system, the equilibrium solubilities and phase diagram of the quinary system Li+/Cl-, SO42-, CO32-, B4O72--H2O at 298 K were studied by isothermal dissolution equilibrium method. In the 3-dimentional solubility diagram or its projection diagram saturated with solid LiCl, there are four crystallization fields, four univariant curves and one invariant point. At the invariant point, the saturated solid salts are LiCl·H2O, Li2B4O7·3H2O, Li2CO3 and Li2SO4·H2O. No double salt or solid solution is formed.Zabuye saline lake, Tibet, China, is unrivalled in the world for its high concentration of chloride, sulfate, carbonate and borate of lithium, sodium and potassium. Always at the later stage of the evaporation of brines, most sodium and potassium salts are crystallized out, so the main components of brines can be described with the Li+, Mg2+/Cl-, SO42-, CO32-, B4O72--H2O system. As a part of study on the equilibrium of this complex system, the equilibrium solubilities and phase diagram of the quinary system Li+/Cl-, SO42-, CO32-, B4O72--H2O at 298 K were studied by isothermal dissolution equilibrium method. In the 3-dimentional solubility diagram or its projection diagram saturated with solid LiCl, there are four crystallization fields, four univariant curves and one invariant point. At the invariant point, the saturated solid salts are LiCl·H2O, Li2B4O7·3H2O, Li2CO3 and Li2SO4·H2O. No double salt or solid solution is formed.

关 键 词：五元体系 相关系 溶解度 锂盐 青藏高原 盐湖 

分 类 号：TS312[轻工技术与工程] O642.54[理学—物理化学]