Separation of lithium isotopes by using solvent extraction system of crown ether-ionic liquid

被引：27

作者：

Sun, Huaxin ^{[1
,2
,3
]}

Jia, Yongzhong ^{[1
,2
]}

Liu, Bing ^{[1
,2
,3
]}

Jing, Yan ^{[1
,2
]}

Zhang, Quanyou ^{[1
,2
]}

Shao, Fei ^{[1
,2
]}

Yao, Ying ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Comprehens & Highly Efficient Utilizat Sa, Xining 810008, Qinghai, Peoples R China

[2] Qinghai Engn & Technol Res Ctr Comprehens Utiliza, Xining 810008, Qinghai, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

FUSION ENGINEERING AND DESIGN | 2019年 / 149卷

基金：

中国国家自然科学基金;

关键词：

Lithium isotopes separation; Ionic liquids; Solvent extraction; Cation exchange; Multistage extraction experiment; STRUCTURAL VARIATIONS; BASES HSAB; SOFT ACIDS; HARD;

D O I：

10.1016/j.fusengdes.2019.111338

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

A solvent extraction system was selected to separate lithium isotopes by using 1-Ethyl-3-methyl-imidazolium-bis (trifluoromethysulfonyl)-imide ([EMIm][NTf2]) as extraction solvent, Dibenzo-15-crown-5 (DB15C5) as extracting agent and a traditional organic solvent as diluent. The effect of kinds of diluent, the content of ionic liquid in organic solvent, extraction time, extractant concentration and counter anions of lithium salt on the separation of lithium isotopes was studied. The single-stage separation factor a can reach up to 1.031 +/- 0.001 and the abundance of the light isotope Li-6 in organic phase can reach 7.76%. The exchange mechanism between the lithium salt and the ionic liquid is cation exchange. Lithium ions and ionic liquid cations are 1:1 exchange in the extraction system. Multistage experiment for separation of lithium isotope was also developed for enrichment of Li-6 as much as possible. The abundance of Li-6 in organic phase can reach 7.80% after 5 stages extraction experiment. Lithium of organic phase was stripped into the aqueous phase by 1 mol L-1 HCl solution.

引用

页数：6

共 32 条

[1] Radiolysis of crown ether-ionic liquid systems: identification of radiolytic products and their effect on the removal of Sr2+ from nitric acid [J].