Extraction of Lithium from Salt Lake Brine using N523-TBP Mixture System
投稿时间:2019-04-10  修订日期:2019-05-08
DOI:10.12119/j.yhyj.201902009
中文关键词:  
英文关键词:Lithium  Solvent extraction  TBP  N523  Third phase  Structure  Thermodynamic
基金项目:
作者单位E-mail
SHI Dong Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences Xining,810008, China
Qinghai Engineering and Technology Research Center of Salt Lake Resources Development, Xining 810008, Qinghai, China 
shidong@isl.ac.cn 
LI Li-juan Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences Xining,810008, China
Qinghai Engineering and Technology Research Center of Salt Lake Resources Development, Xining 810008, Qinghai, China 
lilj@isl.ac.cn 
LI Jin-feng Shanghai Institute of Organic Chemistry, Chinese Academy of Science, Shanghai,200032, China  
JI Lian-min Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences Xining,810008, China
Qinghai Engineering and Technology Research Center of Salt Lake Resources Development, Xining 810008, Qinghai, China 
 
SONG Fu-gen Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences Xining,810008, China
Qinghai Engineering and Technology Research Center of Salt Lake Resources Development, Xining 810008, Qinghai, China 
 
PENG Xiao-wu Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences Xining,810008, China
Qinghai Engineering and Technology Research Center of Salt Lake Resources Development, Xining 810008, Qinghai, China 
 
ZHANG Li-cheng Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences Xining,810008, China
Qinghai Engineering and Technology Research Center of Salt Lake Resources Development, Xining 810008, Qinghai, China 
 
ZHANG Yu-ze Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences Xining,810008, China
Qinghai Engineering and Technology Research Center of Salt Lake Resources Development, Xining 810008, Qinghai, China 
 
LI Hui-fang Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences Xining,810008, China
Qinghai Engineering and Technology Research Center of Salt Lake Resources Development, Xining 810008, Qinghai, China 
 
SONG Xue-xue Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences Xining,810008, China
Qinghai Engineering and Technology Research Center of Salt Lake Resources Development, Xining 810008, Qinghai, China 
 
NIE Feng Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences Xining,810008, China
Qinghai Engineering and Technology Research Center of Salt Lake Resources Development, Xining 810008, Qinghai, China 
 
ZENG Zhong-min Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences Xining,810008, China
Qinghai Engineering and Technology Research Center of Salt Lake Resources Development, Xining 810008, Qinghai, China 
 
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
Qinghai Engineering and Technology Research Center of Salt Lake Resources Development, Xining 810008, Qinghai, China 
 
GUO Fan Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences Xining,810008, China
Qinghai Engineering and Technology Research Center of Salt Lake Resources Development, Xining 810008, Qinghai, China 
 
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中文摘要:
      
英文摘要:
      In this work, problems encountered by tri-butyl phosphate (TBP) in the industrialization of lithium extraction from salt lake brine were discussed in detail. The behavior of N, N-bi-(2-ethylhexyl) acetamide (N523) during lithium extraction was investigated, and its disadvantages were analyzed in the view of practical application. An N523-TBP mixture extraction system was proposed to alleviate or avoid the defects that N523 and TBP met when they were used separately. The optimal composition of this mixture extraction system was determined to be 20%N523-30%TBP-50% kerosene. The effects of brine acidity, Fe/Li molarity ratio, phase ratio and chloride ion concentration on lithium extraction efficiency were discussed. The operation conditions in single-stage extraction were optimized as brine acidity=0.05 mol/L, Fe/Li molarity ratio=1.3, and phase ratio=2. The high concentration of chloride ions in brine was beneficial for the extraction of lithium. The structure of the extracted complex was proposed as (LiFeCl4·nN523·mTBP)·(2-n)N523·(2-m)TBP (m+n=2) by chemical analysis and slope-fitting methods. The extraction thermodynamic functions were calculated preliminarily, and the results suggested that the extraction process was an exothermic (ΔH<0) and spontaneous (ΔG<0) reaction, and the degree of disorder increased (ΔS>0) during the extraction process. This work will give some guidance to the lithium industry of Qinghai in both the fundamental theory and practical application.
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