| Extraction of Lithium from Salt Lake Brine using N523-TBP Mixture System |
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| 作者姓名： | 时东 李丽娟 李晋峰 姬连敏 宋富根 彭小五 张利诚 张禹泽 李慧芳 宋雪雪 聂锋 曾忠民 刘志启 郭凡 |
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| 作者单位： | 中国科学院青海盐湖研究所,中国科学院青海盐湖研究所,中国科学院上海有机化学研究所,中国科学院青海盐湖研究所,中国科学院青海盐湖研究所,中国科学院青海盐湖研究所,中国科学院青海盐湖研究所,中国科学院青海盐湖研究所,中国科学院青海盐湖研究所,中国科学院青海盐湖研究所,中国科学院青海盐湖研究所,中国科学院青海盐湖研究所,中国科学院青海盐湖研究所,中国科学院青海盐湖研究所 |
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| 基金项目： | National Key Research and Development Program of China (No. 2018YFC0604800), National Natural Science Foundation of China (No. U1707601), Science and Technology Major Project of Qinghai Province (2019-GX-A5), West Light Talent Program of Chines Academy of Sciences (Doctor Project, 2016). |
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| 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 lithium extraction behavior of N, N-bi-(2-ethylhexyl) acetamide (N523) was investigated, and its defect was analyzed in the view of practical application. The N523-TBP mixture extraction system was proposed to alleviate or avoid the defects that N523 and TBP met when they were used severally. The composition of this mixture extraction system was determined as 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 respectively. 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 ion in brine was benefit for extraction of lithium. The structure of 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 fundamental theory and practical application.
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| 关 键 词： | Lithium Solvent extraction TBP N523 Third phase Structure Thermodynamic |
| 收稿时间： | 2019/4/10 0:00:00 |
| 修稿时间： | 2019/5/8 0:00:00 |
Extraction of Lithium from Salt Lake Brine using N523-TBP Mixture System |
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| shi dong,li li juan,li jin feng,ji lian min,song fu gen,peng xiao wu,zhang li cheng,zhang yu ze,li hui fang,song xue xue,nie feng,zeng zhong min,liu zhi qi and guo fan.Extraction of Lithium from Salt Lake Brine using N523-TBP Mixture System[J].Journal of Salt Lake Research,2019,27(1). |
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| Authors: | shi dong li li juan li jin feng ji lian min song fu gen peng xiao wu zhang li cheng zhang yu ze li hui fang song xue xue nie feng zeng zhong min liu zhi qi and guo fan |
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| Institution: | Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Shanghai Institute of Organic Chemistry, Chinese Academy of Science,Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Qinghai Institute of Salt Lakes, Chinese Academy of Sciences,Qinghai Institute of Salt Lakes, Chinese Academy of Sciences |
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| Abstract: | |
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| Keywords: | Lithium Solvent extraction TBP N523 Third phase Structure Thermodynamic |
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