Prediction of Phase Equilibria of Li － Na － K －Mg － Cl － SO₄ － H₂O System at Multiple Temperatures

Based on the extended UNIQUAC model，phase equilibria of six quinary subsystems of the simplified water-salt system Li － Na － K － Mg － Cl － SO₄ － H₂O were computed by using software AQSOL027． The computing phase diagrams were compared to experimental phase diagrams and computing phase diagrams with other thermodynamic models whenever they are available． The results showed that AQSOL027 was reasonably accurate and reliable in computing phase  diagrams． Many phase diagrams of six quinary subsystems at multiple temperatures were reported first time． AQSOL027 is an Excel based computer software for Li － Na － K － Mg － Ca － H － Cl － ( HSO₄ /SO₄ ) － ( CO₂ /HCO₃ /CO₃ ) －(H₃BO₃ /B₄O₇ /BO₂ ) － OH － H₂O integrating extended UNIQUAC thermodynamic model and equilibrium algorithm． The applications of AQSOL027 will further extended to computer assist design of salar processing combined with SysCAD process simulator．