摘要
The sodium sulfate subtype Zhabei salt lake in Tibet contains abundant special elements Li, B and K and trace elements Rb and Cs. In this paper, the authors conducted an experiment of 5 ℃-isothermal evaporation of autumn brines and studied the crystallization paths and precipitation regularities of salts in the process of isothermal evaporation by referring to the metastable diagram of the quinary water-salt system of Na+, K+, Mg2+/Cl-, SO42-H2O. The results show that boron is precipitated as borax in the whole evaporation process, and potassium is precipitated as sylvite and aphthitalite until the brine is extremely concentrated.