Abstract
The solubility and the physicochemical properties (densities, viscosities, refractive indices, conductivities, and pH) of the liquid-solid metastable system (NaCl + LiCl + CaCl 2 + H 2 O) at 288.15 K have been studied using the isothermal evaporation method. On the basis of the experimental data, the dry-salt phase diagram, water phase diagram, and the diagram of physicochemical properties versus composition in the system were plotted. The dry-salt phase diagram of the system includes two three-salt cosaturated points of (CaCl 2 ·6H 2 O + NaCl + CaCl 2 ·LiCl·5H 2 ·O) and (LiCl-H 2 O + NaCl + Cad; LiCl·5H 2 O), five metastable solubility isotherm curves, and four crystallization regions corresponding to sodium chloride (NaCL), lithium chloride monohydrate (LiCl·H 2 O), calcium chloride hexahydrate (CaCl 2 .6H 2 O), and the double salt LiCl.CaCl 2 .5H 2 O. No solid solution was found. It was found that the physicochemical properties in the metastable equilibrium solution change regularly with increasing CaCl 2 concentration.
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