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The Separation Properties of Magnesium and Lithium from Brine with high Mg2+/Li+ Ratio by DK Nanofiltration Membrane

Authors： JI Chao, ZHANG Jie, SUN Shuying, LI Ping, YU Jianguo

Units： State-Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China

KeyWords：词： Brine； Separation of magnesium and lithium； Nanofiltration

ClassificationCode：O652.6；TQ028.8

year,volume(issue):pagination： 2014,34(3):79-85

Abstract：

Nowadays, lithium extraction from salt lakes was paid more attentions because of low cost and rich resource. Nevertheless Mg/Li ratio in most Chinese sake lakes is high. It is difficult to recovery of lithium from the brine due to the close property of Mg2+ and Li+. In this work, nanofiltration was used to study the separation of magnesium and lithium in brine. The operation conditions, including operation time, operation pressure, solution temperature, pH value and Mg/Li ratio were investigated. The competition coefficient was adopted to describe the relationship of Mg2+ and Li+ rejections. Moreover, the impact of Na+, K+, and Ca2+ on the separation of Mg2+ and Li+ was studied. And the conclusion was reached that, Mg/Li ratio, operation pressure, as well as pH value had a great effect on Mg/Li separation. For the brine whose Mg/Li ratio was less than 45, it shew the great feasibility of Mg/Li separation by nanofiltration. In addition, the introduction of monovalent ions had much adverse effect on Mg2+/Li+ separation.

Funds：

国家863计划重点项目（2012AA061601）

AuthorIntro：

计超（1988-），男，上海市，硕士，从事膜分离技术及盐湖锂资源的提取和精制方面研究.*通讯联系人，；

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