Solid and Liquid Phase Equilibria of Li+, K+, Ca2+IICl--H2O Quaternary Systems at 298.15 and 273.15 K

Brine deposited in Chaerhan salt lake belongs to the chloride type and can be simplified into the hexnary system Li+, Na+, K+, Mg2+, Ca2+, Cl--H2O. The known solubility data indicate that significant salting-in effects exist in its subsystems of KCl-LiCl-H2O and KCl-CaCl2-H2O, which inevitably affect the properties and solubility behavior of actual brine. In this work, the solubility behavior study and phase diagram determination are extended to the quaternary system of Li+, K+, and Ca2+IICl-- H2O. The phase equilibrium data at 298.15 and 273.15 K are reported, and five solid species, including two double salts KCl center dot CaCl2 and LiCl center dot CaCl2 center dot 5H2O, are found. The salting-in effect is still exhibited in the Li+, K+, and Ca2+IICl--H2O system and results in a very high total salt content at invariant points; e.g., they are 59.08 and 46.93% at 298.15 and 273.15 K, respectively.