Abstract
The isothermal dissolution equilibrium method has been used to investigate the solid and liquid equilibria of quaternary system Li2SO4-Na2SO4-K2SO4-H2O at 288 K. The phase diagram and water diagram were plotted according to the experiment results. It was found that Li2SO4-Na2SO4-K2SO4-H2O quaternary system contains four double salts at 288 K. There are six invariant points, twelve univariant curves and seven areas of crystallization: Li2SO4 H2O, Na2SO4 10H2O, K2SO4, Li2SO4 3Na2SO4 12H2O, Li2SO4 K2SO4, Na2SO4 3K2SO4, 2Li2SO4 Na2SO4 K2SO4. Using the equilibrium solubility data of the quaternary system at 288 K, the solubility product(lnKsp) of solid phase 2Li2SO4 Na2SO4 K2SO4, which is not reported was acquired. Based on the chemical model of Pitzer’s electrolyte solution theory, the solubilities for the quaternary system Li2SO4-Na2SO4-K2SO4-H2O at 288 K were calculated with corresponding parameters. Compared the results of experimental measurement with those of calculation, it was showed that the calculated values had a good agreement with the experimental ones.
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