Abstract Using the method of isothermal dissolution equilibrium, stable phase equilibria of unreported strontium-containing systems LiCl–NaCl–SrCl2–H2O and LiCl–KCl–SrCl2–H2O at 298 K have been studied in accordance with the compositions of the underground brine in western Sichuan Basin. The experimental results show that there are no solid solution and complex salt in two quaternary systems. The phase diagram of quaternary system LiCl–NaCl–SrCl2–H2O consists of two invariant points, five isothermal dissolution curves and four crystallization regions. The quaternary system LiCl–KCl–SrCl2–H2O belongs to a simple type and the phase diagram consists of two invariant points, five isothermal dissolution curves and four crystallization regions. The solubilities of salts in the above systems were accurately calculated with Pitzer electrolyte solution theory. It was found that the calculated phase diagrams coincided basically with the experimental phase diagrams by evaluated the accuracy through the experimental results. Meanwhile, the applicability of Pitzer parameters selected in this paper was validated.

中文翻译：

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两种四元体系中固液平衡的测量和计算：LiCl-NaCl-SrCl2-H2O 和 LiCl-KCl-SrCl2-H2O 在 298 K

摘要 采用等温溶解平衡法，根据西部地区地下卤水的成分，研究了未报道的含锶体系 LiCl-NaCl-SrCl2-H2O 和 LiCl-KCl-SrCl2-H2O 在 298 K 的稳定相平衡。四川盆地。实验结果表明，在两个四元体系中不存在固溶体和复盐。四元体系 LiCl-NaCl-SrCl2-H2O 的相图由两个不变点、五个等温溶解曲线和四个结晶区组成。四元体系 LiCl-KCl-SrCl2-H2O 属于简单类型，相图由两个不变点、五个等温溶解曲线和四个结晶区组成。用Pitzer电解质溶液理论准确计算了上述体系中盐的溶解度。通过实验结果评价其精度，发现计算出的相图与实验相图基本吻合。同时验证了本文选取的Pitzer参数的适用性。