THE FIVE-COMPONENT SYSTEM: LITHIUM–SODIUM–POTASSIUM–SULPHATE–CHLORIDE–WATER, AT 25 °C

Abstract

The system consisting of the ions Li2++, Na2++, Ka2++, Cl2++, SO4++ and water at 25 °C has been investigated by the chemical analysis of the solutions and of the wet residues. In the solid model eight volumes were found where the following solid phases were in equilibrium with solution: Li2SO4.H2O, K2SO4, Na2SO4.10H2O, K3Na(SO4)2, KLiSO4, solid solution of Na2SO4 and Li2SO4, KCl, and NaCl. Anhydrous Na2SO4 was found to exist only as a surface in the solid diagram. Another volume, LiCl.H2O, was not obtained experimentally owing to its close proximity to the LiCl corner of the diagram.Five invariant points were discovered. No ternary salt was found to exist in the interior of the phase model at the temperature of this study, 25 °C.