DK纳滤膜对高镁锂比卤水的分离性能研究  

Separation properties of magnesium and lithium from brine with high Mg^(2+)/Li^+ ratio by DK nanofiltration membrane

作　　者：计超[1] 张杰[1] 张志君 孙淑英[1] 李平[1] 于建国[1] 

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237 [2]青海盐湖工业股份有限公司技术部,格尔木816000

出　　处：《膜科学与技术》2014年第3期79-85,共7页Membrane Science and Technology

基　　金：国家"863"计划重点项目(2012AA061601)

摘　　要：针对我国大部分盐湖卤水高镁锂比的资源结构特点,锂的提取困难问题,采用纳滤技术研究镁锂分离的效果,实验考察了操作条件的影响,包括操作时间、操作压力、进水温度、溶液pH值和镁锂比对分离的影响.引入镁锂竞争系数,得出镁锂截留率之间的关系.同时也研究了Na+、K+、Ca2+离子对镁锂分离效果的影响.结果表明,Mg/Li比、操作压力和pH值对Mg2+和Li+分离效果有较大的影响.对Mg与Li比小于45的卤水,纳滤膜对镁锂分离显示出较大的可行性.一价离子的引入对镁锂分离产生较为不利的影响.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 properties 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 impacts of Na＋,K＋,and Ca2＋ on the separation of Mg2＋ and Li＋ were studied.And the conclusions are reached that,Mg/Li ratio,operation pressure,as well as pH value have a great effect on Mg/Li separation.For the brine whose Mg/Li ratio is less than 45,it shows the great feasibility of Mg/Li separation by nanofiltration.In addition,the introduction of monovalent ions has much adverse effects on Mg2＋/Li＋ separation.

关 键 词：卤水 镁锂分离 纳滤 

分 类 号：TQ028.8[化学工程] O6-332[理学—化学]