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

Cui Rui-zhi, Nie Guo-liang, Li Jun, Kaj Thomsen, Li Wu

Research output: Contribution to journalJournal articlepeer-review


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.
Original languageEnglish
Article number2
JournalJournal of Salt Lake Research
Issue number2
Number of pages19
Publication statusPublished - 2021


  • Salt-lake brine
  • Phase equilibrium
  • UNIQUAC thermodynamic model
  • Computing phase diagram


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