Solid–Liquid Equilibria of the Quinary System Li⁺, K⁺, Mg²⁺//Cl^–, B₄O₇^2––H₂O at 323.2 K

Abstract

The solid−liquid equilibria of the quinary system Li + , K + , Mg 2+ //Cl − , B 4 O 7 2− −H 2 O at 323.2 K were investigated by the isothermal dissolution method. The solubility, refractive index, and density of the system were determined, and the corresponding space phase diagram, planar projection diagram, water content diagram, and density/refractive index vs composition diagrams saturated with MgB 4 O 7 are constructed based on the experimental data. The result shows that there are double salts of lithium carnallite (LiCl•MgCl 2 •7H 2 O) and carnallite (KCl•MgCl 2 •6H 2 O) formed in the system. The space phase diagram consists of five invariant points, 16 isothermal solution curves, and eight crystalline regions (