Solid–Liquid Phase Equilibrium of the Quaternary System (CaCl 2 + CaSO 4 + CaB 6 O 10 + H 2 O) at 288.15 K and Atmospheric Pressure

The solid–liquid phase equilibrium of the quaternary system (CaCl 2 + CaSO 4 + CaB 6 O 10 + H 2 O) at 288.15 K and atmospheric pressure were investigated with the method of isothermal dissolution equilibrium. The dry-salt, water-phase diagrams and physicochemical properties including refractive index, density and pH versus composition diagrams were plotted on the basis of the experimental data. In the dry-salt diagram of the quaternary system, there is one invariant point, three solubility curves and three crystallization regions corresponding to single salts antarcticite (CaCl 2 ·6H 2 O, Ant), gypsum (CaSO 4 ·2H 2 O, Gy) and gowerite (CaB 6 O 10 ·5H 2 O, Gow). No double salt or solid solution was formed. The area of crystallization region of gypsum is the largest, and that of antarcticite is the smallest. In addition, the physicochemical properties showed a regular change with the Jänecke index value of J (CaCl 2 ).