中文摘要：

Li＋,Na＋,K＋/Cl-,SO42--H2O五元体系相图对于硫酸钠亚型富锂卤水分离提取锂盐、锂辉石加工利用和锂盐产品的开发利用工艺制定都有指导作用。20世纪50年代曾有人研究过这一体系25℃时的相图,限于当时的科研水平,液相组成确定不准确,对平衡固相的判断,后来诸多研究结果证明也有错误。50多年来再没有人研究这一五元体系相图。利用我们提出的Li＋,Na＋,K＋,Mg2＋/Cl-,SO42--H2O六元体系热力学模型,对该五元体系的平衡溶液组成和正确的平衡固相进行理论预测,给出了该体系的完整相图。结合硫酸锂混盐分离、加工实例阐述了该五元体系相图的应用。

英文摘要：

The quinary system of Li＋, Na ＋, K ＋/C1 -, SO42- - H2O is useful for separation of Li salts from Li-bearing brine of Na-sulfate subtype, processing spodumene ore and technology of lithium salts etc. The only study report was published in the 1950s, but its result should be improved because of limitation of technical conditions at that time. Existence of Li-double salts in its subsystems was confirmed thereafter. New research has not been appeared for over 50 years. Prediction of chemical composition and existence of solids at equilibrium are given by using our thermodynamic model for the system Li＋ , Na ＋, K ＋/Cl-, SO2- -H2O in the present paper. As an example of its applications, separation of Li-sulfate mixture is also described in detailed in the paper.