Experiment Study of Solar Evaporation of Brine from the Dangxiongcuo Salt Lake in Tibet in Winter
详细信息
- 责任者：Wu Qian (Institute of Mineral Resources ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Zheng Mianping
- 刊名：Acta Geologica Sinica
- 出版年：2013
- 卷期：87(3)
- 关键词：卤水 ; brines ; 综合利用 ; comprehensive utilization ; 西藏 ; Tibet
- 页码：p.433-440
- 图表：illus., 6 tables, 16 refs.
- 分类号：2000
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
Dangxiongcuo salt lake, located in the southwest part of Tibet plateau, has the moderate carbonate-type brine, with the good industrial exploitation prospect and value. Natural evaporation is the basic work of solar evaporation technology application in the salt field. Based on the relative results of the indoor isothermal evaporation experiment on brines, this study conducted a field solar evaporation experiment on the brine from Dangxiongcuo salt lake in winter. Collecting and dispersal behaviors of Li+, B+, K+ were analyzed in detail through investigating the enrichment of the chemical elements in the liquid and the crystallization regularity of the salt minerals. The controlling conditions of salt separation were also explored using elements enrichment, evaporation loss amount of water, crystallization order, mineral assemblage, and physical change during brine evaporation process. By referring to the metastable diagram of the quinary system Na+,K+/CO32-,SO42-,Cl--H2Oat 25℃, crystallization paths and precipitation regularities of salts from brine of the Dangxiongcuo salt lake in winter during process of solar evaporation had been drawn. The experiment results show that halite （NaCl）, natron （Na2CO3·10H2O）, trona （Na2CO3·NaHCO3·2H2O）, borax （Na2B4O7·10H2O）, sylvite （KCl）, zabuyelite （Li2CO3） can be crystallized in sequence from the brine as a result of solar natural evaporation. Some low-temperature products such as mirabilite （Na2SO4·10H2O） and natron can be precipitated or entrained within the mother liquid in advance. The brine rich in Li+ can be prepared through the low-temperature evaporation in winter, and the mother liquid at later evaporation stage can also be used to extract borax and sylvite. All this results provide both the preliminary data for engineering design and brine preparation operation technology in the salt field and theoretical support for the large-scale exploitation of the valuable resource in Dangxiongcuo salt lake.