研究论文

西藏班戈湖淡化湖水的自然蒸发和析盐规律

  • 余疆江 ,
  • 郑绵平 ,
  • 伍倩 ,
  • 王云生 ,
  • 乜贞 ,
  • 卜令忠
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  • 中国地质科学院矿产资源研究所, 国土资源部盐湖资源与环境重点实验室, 北京 100037
余疆江,博士后,研究方向为盐类矿产综合开发利用,电子信箱:dewapex@163.com

收稿日期: 2015-05-26

  修回日期: 2015-08-12

  网络出版日期: 2016-03-25

基金资助

国家自然科学基金项目(41203046);国土资源部公益性行业科研专项(201011001);中国地质调查局地质调查项目(12120115027901);中央级公益性科研院所基本科研业务费专项(K1322,K1418)

Natural evaporation and crystallization of Bangor salt lake water in Tibet

  • YU Jiangjiang ,
  • ZHENG Mianping ,
  • WU Qian ,
  • WANG Yunsheng ,
  • NIE Zhen ,
  • BU Lingzhong
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  • MLR Key Laboratory of Saline Lake Resources and Environments, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

Received date: 2015-05-26

  Revised date: 2015-08-12

  Online published: 2016-03-25

摘要

全球气候变暖给青藏高原的湖泊带来极大的影响,湖泊面积的扩大使湖水淡化严重,针对淡化碳酸盐型盐湖的研究意义重大。现场自然蒸发实验以班戈湖淡化碳酸盐型盐湖为研究对象,以Na+、K+/Cl-、SO42-、CO32--H2O五元体系298 K介稳相图为指导,探讨了湖水的pH值变化以及碱金属元素含量对矿物析出的影响。实验结果显示,淡化湖水在自然蒸发过程中需要经历更长的时间才能出现矿物沉淀。湖水的pH值在经历一个缓慢的降低过程后,在蒸发后期又迅速升高,这主要与湖水中的CO32-、HCO3-和OH-含量有关,且与之正相关。在影响淡化湖水酸碱性质的主要碱金属元素中,Na的作用大于K,最后是Li。与之对应的矿物也由中性向碱性转变,表现出的矿物析出顺序为芒硝、石盐、钾芒硝、碳酸钠矾和天然碱。利用不同矿物的析出特性可以分阶段进行回收提取,对盐湖资源开发具有现实意义。

本文引用格式

余疆江 , 郑绵平 , 伍倩 , 王云生 , 乜贞 , 卜令忠 . 西藏班戈湖淡化湖水的自然蒸发和析盐规律[J]. 科技导报, 2016 , 34(5) : 60 -66 . DOI: 10.3981/j.issn.1000-7857.2016.05.006

Abstract

Considering the huge impact of global warming on lakes on Qinghai-Tibet Plateau and the serious lake desalination resulting from expanded lake area, the research on carbonate-type desalinated saline lakes is of great significance. Taking the carbonate-type salt lake of Bangor Lake as the research object, the on-spot natural evaporation experiment has explored the pH changes in lake water and the effect of alkali metal elements content on mineral separation under the guidance of 298 K metastable phase diagram of quinary system of Na+, K+/Cl-, SO42-, and CO32--H2O, Experimental results show that mineral deposits from desalinated lake water would be developed in a longer period in the context of natural evaporation. After a slow reduction process, the pH value of lake water is increased rapidly in the late stage of evaporation, which is mainly related to and positively correlated with the contents of CO32-, HCO3- and OH- in the lake water. Among the main alkali metal elements that affect the acid-base property of desalinated lake water, the role of Na exceeds that of K, followed by Li. Their corresponding minerals are also changed from neutral to alkali property; and the order of separated minerals is mirabilite, halite, aphthitalite, burkeite and trona. Based on the separation characteristics of different minerals, they can be recovered and extracted by stages, which is practically significant in the development of the salt lake resources.

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