| Abstract: The salt lake brine contains a lot of inorganic salt resources, and it is an important source for the inorganic chemicals. Dangxiongcuo salt lake is a typical carbonate-type salt lake in Tibet of China, which is rich in Li, K and B. The local climatic condition is very suitable for the exploitation and utilization of salt lake brine by using the salt field phase-separation technique. In this paper, the natural evaporation experiment of Dangxiongcuo salt lake brine has been operated in the lake-district. The concentrating behaviors of Li, K, B with their separated conditions were analyzed in detail. According to the quinary system Na+, K+/CO32-, SO42-, Cl--H2O (25 ℃) metastable diagram, the crystallization path of salts has been drawn and the precipitation sequence is halite (NaCl), thermonatrite (Na2CO3·H2O), trona (Na2CO3·NaHCO3·2H2O), sylvite (KCl), aphthitalite (Na2SO4·3K2SO4), borax (Na2B4O7·10H2O) and zabuyelite (Li2CO3). The comparison of brine concentration and crystallization regularity between summer and winter has also been listed. All these can provide the technology foundation for the comprehensive exploitation and utilization of the carbonate-type salt lake brine such as Dangxiongcuo. |
