Extraction of lithium from magnesium-rich solution using a new ionic liquid extraction system

被引：21
作者：
Zhou, Wanji [1 ,2 ]
Li, Zheng [3 ]
Zhang, Chao [1 ]
Ma, Lei [1 ,2 ]
Bi, Qiuyan [1 ]
Xu, Shiai [1 ,2 ]
机构：
[1] Qinghai Univ, Sch Chem Engn, Xining 810016, Peoples R China
[2] East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China
[3] Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, State Key Lab Biochem Engn, Beijing 100190, Peoples R China
来源：
JOURNAL OF MOLECULAR LIQUIDS | 2023年 / 382卷
基金：
中国国家自然科学基金;
关键词：
Brine; Ionic liquid; Tri-n-butyl phosphate; Extraction of lithium; SALT LAKE BRINE; TRIBUTYL-PHOSPHATE; SOLVENT-EXTRACTION; ENERGY-STORAGE; RECOVERY; BATTERIES; PRECIPITATION; SEPARATION; KEROSENE; FECL3;
D O I：
10.1016/j.molliq.2023.121833
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A new extraction system, tetraoctylammonium bis(trifluoromethylsulfonyl)imide (N8888NTf2)/tri-n-butyl phos-phate (TBP)/sodium perchlorate (NaClO4), is proposed for extracting lithium (Li) from magnesium (Mg)-rich solution. This system can increase the Li+ extraction efficiency compared with TBP/NaClO4 system and decrease the stripping acidity compared with TBP/bis(trifluoromethylsulfonyl)imide lithium (LiNTf2) system. Cation loss of ionic liquid can also be avoided in the extraction process. Under optimal conditions, the Li+ extraction effi-ciency reaches 82.3% and the Li+/Mg2+ separation factor reaches 254. The Li+ stripping efficiency reaches about 100% when 0.5 mol center dot L-1 HCl is used as stripping agent. The extraction mechanism of N8888NTf2/TBP/NaClO4 system is proposed based on experimental results and verified by Fourier transform infrared spectroscopy (FT-IR), slope analysis, and simulation calculation using Gaussian software. N8888NTf2/TBP/NaClO4 system is highly stable over seven extraction cycles. This new extraction system has a great potential for selective extracting Li+ from Mg2+ rich brine.
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页数：7
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