Lithium extraction from carbonate-rich Salt Lake brine using HBTA/TBP system  

作　　者：Lian-Min Ji Dong Shi Xiao-Wu Peng Shao-Lei Xie Jin-Feng Li Yu-Ze Zhang Li-Cheng Zhang Yong Niu Gang Chen Li-Juan Li 

机构地区：[1]Key Laboratory of Green and High-end Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,810008,China [2]Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources,Xining,810008,China [3]Shanghai Institute of Organic Chemistry,Chinese Academy of Sciences,Shanghai,200032,China

出　　处：《Rare Metals》2024年第12期6717-6729,共13页稀有金属(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(No.U21A20305);Qinghai Provincial Department of Science and Technology(No.2022-ZJ-728);the Youth Innovation Promotion Association of the Chinese Academy of Sciences(No.2021430)。

摘　　要：China's salt lakes hold significant lithium reserves,yet the development of low-concentration lithium resources from the carbonate brines in Tibet is a pressing matter.Alkylβ-diketones extractants are capable of efficiently extracting lithium from alkaline solutions using an extraction method,but its optimized extraction prerequisite is an extreme alkaline solution with higher pH.This research introduces a process for the effective extraction and separation of lithium and sodium from the carbonate brine of Jieze Caka Salt Lake,utilizing trifluorinated β-biketone HB TA(4,4,4-trifluoro-1-phenyl-1,3-butanedione)-TBP(tributyl phosphate)/kerosene system.A threestage extraction yielded 98.06%of Li^(+)and 1.69%of Na^(+)from the initial brine with a lower pH of 8.961 and a separation factor(β_(Li/Na))of 2948.The simplified process was then implemented using organic direct recycling without regeneration and scrubbing raffinate reflux for a total of 23 cycles,thereby demonstrating the exceptional effectiveness and stability of this system.The resulting lithium-rich stripping solution,with the Li/Na mass ratio amplified by 747 times,underwent further magnesium removal and precipitation using sodium carbonate to yield a high-purity lithium carbonate product of 99.50%.This study offers a novel approach and technology for the efficient separation of lithium ion directly from a partialneutral carbonate salt lake with a high Na/Li ratio and low lithium concentration.

关 键 词：LITHIUM Carbonated salt lake Solvent extraction Diketone extractant Tibet brine 

分 类 号：TM9[电气工程—电力电子与电力传动]