盐湖卤水萃取提锂及其机理研究  

Extraction of Lithium from Salt Lake Brine and Mechanism Research

作　　者：孙淑英[1] 叶帆[1] 宋兴福[1] 李云钊[1] 汪瑾[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

出　　处：《无机化学学报》2011年第3期439-444,共6页Chinese Journal of Inorganic Chemistry

基　　金：中央高校基本科研业务费专项资金;国家自然科学基金(No.20906022)资助项目

摘　　要：本文以磷酸三丁酯(TBP)为萃取剂,煤油为稀释剂,在FeCl3存在的条件下,选择性萃取盐湖卤水中的锂。系统研究了相比、萃取剂组成、铁锂比等对锂萃取率的影响,及洗涤、反萃取工艺条件。得到最佳工艺条件为:萃取相比VO/VA为1.5,TBP质量分数为75%,cFe3+/cLi+=2,cH+=0.02 mol.L-1,萃取时间为20 min;洗涤相比VO/VA为15;反萃取相比VO/VA为20。并运用红外与核磁方法分析研究,表明是TBP上的P=O双键与LiFeCl4金属配合物的配位水分子产生氢键作用而使金属配合物与TBP结合。The paper presents extraction of lithium from salt lake brine by tributyl phosphate（TBP）-kerosene-FeCl3 extraction system.Extraction,washing and back extraction stages were studied systematically.The best conditions were determined by studying the single factors of extraction VO/VA ratio,extractant composition,molar ratio of Fe3＋ to Li＋ and so on,and the results were： extraction VO/VA is 1.5,TBP% is 75%,c is 2,c is 0.02 mol·L-1,extraction time is 20 min;washing VO/VA is 15;back extraction VO/VA is 20.The interaction of lithium complex with TBP was investigated by IR and NMR.The results showed that the complex and TBP were associated by hydrogen bond.

关 键 词：萃取 卤水 锂 磷酸三丁酯 

分 类 号：TQ420.6[化学工程] TF826.3[冶金工程—有色金属冶金]