Li^+,Na^+//CO_3^(2-),B_4O_7^(2-),Cl^--H_2O五元体系298K相平衡及平衡液相物化性质的研究  

Studies on the Phase Equilibrium and Physicochemical Properties of Solutions for the Quinary System Li^+,Na^+//CO_3^(2-),B_4O_7^(2-),Cl^--H_2O at 298K

作　　者：殷辉安[1] 郝丽芳[1] 曾英[1] 唐明林[1] 

机构地区：[1]成都理工大学应用化学系,四川成都610059

出　　处：《高校化学工程学报》2003年第1期1-5,共5页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金资助 (49773200)。

摘　　要：针对西藏扎布耶盐湖卤水组成,采用等温溶解平衡法研究了五元体系Li+, Na+//CO32-, B4O72-, Cl- -H2O 298 K下的相平衡关系。测定了该体系298 K时各组份的溶解度及平衡液相的密度、粘度、折光率、电导率和pH值等物化性质, 并绘制了该五元体系的溶解度空间立体图及平衡液相物化性质—组成图。实验表明:体系中共有3个四盐共饱点和6个单盐结晶区;无复盐和固溶体生成;也无碳酸氢盐存在;且LiCl 对硼酸盐、Na2CO3对NaCl 具有强烈的盐析作用。In accordance with the composition of the brine of Zabuye salt lake, Tibet, phase equilibrium of the quinary system Li+, Na+//CO32-, B4O72-, Cl--H2O were studied at 298 K with isothermal method. Solubility and the physicochemical properties such as density, viscosity, refractive index, conductivity and pH value of the equilibrium solutions were determined. Based on the determined values, the solubility stereo-diagram of the quinary system, and the physicochemical properties-composition diagrams of the equilibrium solutions were plotted. The experiments showed that three 4-salt invariant points and six single salt crystallization regions were found in the system, no double salts and solid solution were formed too, and no bicarbonate existed. Strong salting-out effect of LiCl on borate and of Na2CO3 on NaCl was found in the system. The study is helpful to the comprehensive utilization of the salt lake resources.

关 键 词：扎布耶盐湖 水盐体系 相平衡 溶解度 等温溶解平衡法 密度 粘度 折光率 电导率 pH值 碳酸盐 

分 类 号：O642.42[理学—物理化学] TS311[理学—化学]