N523-TBP混合萃取体系从盐湖卤水中萃取锂的机理研究  

Mechanism Study of Extracting Lithium from Brine with N523-TBP Mixed Extraction System

作　　者：时东[1] 李丽娟[1] 宋富根[1] 彭小五 姬连敏[1] 宋雪雪[1] 张利诚[1,2] 聂锋[1] 曾忠民[1] 刘志启[1] SHI Dong LI Li-juan SONG Fu-gen PENG Xiao-wu JI Lian-min SONG Xue-xue ZHANG Li-cheng NIE Feng ZENG Zhong-min LIU Zhi-qi(Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, China University of Chinese Academy of Sciences, Beijing, 100049, China)

机构地区：[1]中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海西宁810008 [2]中国科学院大学,北京100049

出　　处：《盐湖研究》2017年第1期57-63,共7页Journal of Salt Lake Research

基　　金：国家自然基金-柴达木化工研究联合基金重点项目(U1407203);中国科学院重点部署项目(KG-ZD-EW-604)

摘　　要：研究了N523(N,N-二乙基己基乙酰胺)-TBP(磷酸三丁酯)混合萃取体系从盐湖卤水中萃取锂的共萃取效应、盐析效应及共存离子影响。FeCl_3、CoCl_2、NiCl_2、CuCl_2、ZnCl_2等过渡金属氯化物盐对锂的共萃取效应研究表明,FeCl_3是最佳的共萃剂,Fe/Li摩尔比为1.3时萃取效果最优。卤水中KCl、CaCl_2、NaCl、MgCl_2、Al Cl3的盐析效应研究表明,MgCl_2是萃取锂天然的最佳盐析剂。卤水中Na^+、K^+、Ca^(2+)等共存离子对锂萃取效果的影响研究表明,锂与共存离子的分离因数顺序为βLiMg>βLiK>βLiNa>βLiCa。N523-TBP混合萃取体系特别适合从高镁卤水中萃取锂,但不适于从含钙较高的卤水中萃取锂。The co-extraction effect, salting-out effect and effect of coexistence ions on lithium extraction by N523-TBP mixed extraction system were studied in this paper. The effects of lithium extraction of dif- ferent co-extraction agent （ FeC13, CoCI2, NiC12 , CuC12 and ZnC12 ） and different Fe/Li molar ratio were studied respectively. The results showed that the optimum co-extraction agent was FeC13 , and the optimum Fe/Li molar ratio was 1.3. The study of the salting-out effect of KC1, CaCI=, NaC1, MgC12 and A1C13 on lithium extraction showed that MgC12 was the best natural salting-out agent. The effect of coexisting ions （Na＋ , K ＋ , Ca2＋ ） on lithium extraction showed that the sequence of separation factor between lithium and coexisting ions was βLiK〉βLiNa〉βLiCa. The mixed extraction system is especially suitable for extrac- ting lithium from brine with high concentration of magnesium, but cannot be applied to brine containing calcium.

关 键 词：锂 N523 TBP 溶剂萃取 共萃取效应 盐析效应 共存离子 

分 类 号：TQ051.72[化学工程]