Ion-pair induced solvent extraction of lithium(Ⅰ)from acidic chloride solutions with tributyl phosphate  

作　　者：Li Cui Lijuan Wang Ming Feng Li Fang Yanxia Guo Fangqin Cheng 

机构地区：[1]Institute of Resources and Environment Engineering,State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources,Shanxi University,Taiyuan,030006,China

出　　处：《Green Energy & Environment》2021年第4期607-616,共10页绿色能源与环境（英文版）

基　　金：supported by the National Natural Science Foundation of China(21706257,21878180);the Shanxi Province Coal Based Low-carbon Technology Major Projects(MC2016-05);the Xiangyuan Key Technology Research Projects(2018XYSDYY-02)。

摘　　要：Lithium(Li)is an important energy metal in the 21st century.However,the selective recovery of Li is still a big challenge,especially from acidic solutions with multiple metal ions existence.Herein we report a new ion pair induced mechanism for selectively extracting Li^(+)from acidic chloride solutions by tributyl phosphate(TBP).It is shown that the acidity and the chloride ions in the aqueous phase have great effects on the extraction of Li^(+).The FT-IR,UV-Vis and ESI-MS experiments provide solid evidence for the formation of ion-pair complex[Li(TBP)_n(H_(2)O)_(m)]^(+)[FeCl_(4)]^(-)(n-1,2,3;m-0,1)in the organic phase,which brings about the effective and efficient extraction of Li^(+).This mechanism can overcome the Hofmeister bias and allow for the selective extraction of Li^(+) from the extremely hydrophilic chlorides.It has also been proved that the loaded Li in TBP can be effectively stripped by concentrated HCl solution with a Li/Fe separation factor>500.The understanding of the ion-pair transport mechanism is helpful for optimizing the recovery process or further advancing more efficient recovery techniques for Li from acidic liquor.

关 键 词：LITHIUM ION-PAIR Tributyl phosphate Acidic chloride solution 

分 类 号：TQ131.11[化学工程—无机化工]