Experimental study of isothermal evaporation of Lhaguo Tso Salt Lake in Tibet at 0°C.

The research shows that the original compositions of the brine of Lhaguo Tso Salt Lake in Tibet is located in the mirabilite region of isothermal phase diagram of the Li⁺, Na⁺, K⁺//Cl–, SO₄²–-H₂O quinary system at 0°C, and the isothermal evaporation process is divided into four stages. The first section is the unsaturated section except for carbonate, the second section is the sodium salt section, the third section is the potassium salt section, the last section is the lithium salt section. Among them, the sodium chloride and the potassium chloride will be precipitated with the evaporation process after precipitation, the borax is precipitated gradually, and the lithium salt is precipitated in various forms. This study can provide a basic theoretical basis for the development and utilization of salt lake resources under low temperature conditions. [ABSTRACT FROM AUTHOR]