Stable phase equilibria in the quinary system LiCl–NaCl–KCl–SrCl2–H2O at 288 K

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Sichuan Basin is rich in underground brines, which are important liquid mineral resources. In order to realize the exploitation and utilization of the brine resources, in this work, we used the isothermal dissolution equilibria method to study the phase equilibria of related subsystem for the underground brines. Consequently, the phase equilibria of the quinary system LiCl–NaCl–KCl–SrCl2–H2O at 288 K are studied in detail. The solubilities of salts in saturated liquid phase of the quinary system were measured by chemical analysis, and the equilibrium solid phases of the quinary system were identified by chemical analysis and X-ray powder diffraction. The phase diagrams of the quinary system LiCl–NaCl–KCl–SrCl2–H2O at 288 K were also given, and simplified dry base salt diagram, water content diagram and saturated salt content diagram of each salt saturation surface were presented respectively. The results show that the quinary system is a hydrate type. When LiCl, NaCl, KCl and SrCl2 are saturated respectively, the dry salt phase diagrams have different crystalline regions. When LiCl·2H2O is saturated, the crystalline regions are SrCl2·2H2O, NaCl and KCl; When NaCl is saturated, the crystalline regions are KCl, SrCl2·6H2O, SrCl2·2H2O and LiCl·2H2O; When KCl is saturated, the crystalline regions are NaCl, SrCl2·6H2O, SrCl2·2H2O and LiCl·2H2O; When SrCl2·6H2O is saturated, the crystalline regions are KCl, NaCl and SrCl2·2H2O.