Na^+,K^+∥Cl^-,SO_4^(2-),CO_3^(2-)—H_2O五元体系25℃介稳相图的理论计算  

Theoratical Calculation of the Metastable Phase Diagram of the Quinary System Na^+, K^+//Cl^-, SO_4^(2-), CO_3^(2-) —H_2O at 25℃

作　　者：房春晖[1] 宋彭生[1] 陈敬清[1] 

机构地区：[1]中国科学院盐湖研究所,西宁810008

出　　处：《盐湖研究》1993年第2期16-22,共7页Journal of Salt Lake Research

基　　金：中国科学院自然科学基金

摘　　要：本文建立在Pitzer电解质溶液理论的基础上,分别由Gibbs生成自由能和平均溶度积计算了Na^+,K^+,//Cl^-,SO_4^(2-),CO_3^(2-)-H_2O五元体系介稳相图。计算结果表明,前者偏离实验值,而后者与实验测定的介稳相图相吻合。由直线规则计算了内蒙古哈同察汗淖碱湖卤水的等温蒸发路线,结果令人满意。The metastable phase relationship occurring spontaneously in an open system at constant temperature and pressure is part of continuous phase transition. Based on Pitzer's theory of aqueous electrolyte solution, the metastable phase diagram of the quinary system Na^+, K^+∥Cl^-, SO_4^(2-), CO_3^(2-)-H_2O at 25℃ has been respectively calculated from Gibbs free energy of formation of solid and from average K_(sp) in IBM PC. The results show that the former deviates from the experimental value, while the latter is in coincidence with the determined metastable phase diagram. The isothermal evaporation path of Hetongchaharmao Lake, Inner Mongolia, has been calculated from straight line rule. The results are very satisfactory.

关 键 词：相图 计算 介稳相平衡 碳酸盐 

分 类 号：O611.65[理学—无机化学]