Studies on Phase Equilibria in the Ternary System LiCl-SrCl2-H2O and the Quaternary System KCl-LiCl-SrCl2-H2O at 308 K

The ternary system LiCl-SrCl2-H2O and the quaternary system KCl-LiCl-SrCl2-H2O at 308 K were investigated using the isothermal dissolution equilibrium method. According to the obtained experimental results, the phase diagrams of the two systems listed above were plotted separately. The results show that both systems belong to hydrate I -type cosaturated systems at 308 K, and there are no double salts or solid solution formation. Lithium chloride has strong salting -out effect on strontium chloride and potassium chloride. There are two invariant points, three univariate curves, and three crystallization zones of SrCl2 center dot 6H(2)O, SrCl2 center dot 2H(2)O, and LiCl center dot H2O in the ternary system LiCl-SrCl2-H2O at 308 K. The equilibrium phase diagram of the quaternary system KCl-LiCl-SrCl2-H2O at 308 K consists of two invariant points, five univariant curves, and four crystallization zones, which correspond to SrCl2 center dot 6H(2)O, SrCl2 center dot H2O, and KCl. These results can provide solubility data for the development and utilization of the underground brine in the Sichuan Basin of China.