纳滤法用于盐湖卤水镁锂分离的初步实验  

Preliminary test of separation of Mg^(2+)/Li^+ in salt lake brine by nanofiltration

作　　者：康为清 时历杰[1] 赵有璟 张大义 张宏韬[1,2] 王敏[1] 

机构地区：[1]中国科学院青海盐湖研究所.青海西宁810008 [2]中国科学院大学 [3]五矿盐湖有限公司

出　　处：《无机盐工业》2014年第12期22-24,共3页Inorganic Chemicals Industry

基　　金：青海省科技支撑计划项目资助,项目名称为一里坪盐湖资源综合开发利用技术集成及产业化示范,项目编号为2013-G-137A

摘　　要：膜分离技术是一门新兴的分离方法。为提取盐湖卤水中的锂资源,采用商业可得的DK纳滤膜对稀释的盐湖卤水进行分离操作,以验证纳滤法对卤水中镁锂分离的可行性。实验结果表明,以3种不同组成的卤水为原料,分别进行单级操作,膜的镁锂分离因子均小于0.1,镁锂质量比分别由原料水中的48.50、42.31、28.30降至渗透水中的4.04、3.21、1.86,证明纳滤法可将卤水中的锂提取分离,同时卤水中几乎全部的钙离子、硫酸根及至少73.81%的硼被有效拦截在浓缩水中。渗透水和浓缩水可分别用于相应无机盐的提取,纳滤法可为盐湖卤水的综合利用提供技术上的支持。The membrane separation is a kind of emerging separation technology.In order to extract lithium from salt like brine, the diluted salt lake brine being as feed water were filtrated with a commercially available DK nanofiltration membrane so as to investigate the possibility of separation of Mg^2＋/Li^＋ by nanofiltration method.Under the experimental operating conditions, the results showed the membrane separation permeate factors （SF） of Mg^2＋/Li^＋ with three feed waters owning different compositions were all less than 0.1 and the Mg^2＋/Li^＋ mass ratios were reduced from 48.50,42.31 ,and 28.30 in the feed warters to 4.04,3.21, and 1.86 in the permeates.It proved the feasibility of extracting lithium from salt lake brine by nanofiltration.Meanwhile almost all Ca^2＋, SO4^2- and at least 73.81% B ware rejected efficiently in the retentates.The permeates and the retentates can be used to extract relevant inorganic salts.So nanofiltration will give the possibility to support comprehensive utilization of salt lake brine.

关 键 词：盐湖卤水 锂 纳滤 

分 类 号：TQ028.8[化学工程]