期刊
CHEMICAL ENGINEERING JOURNAL
卷 420, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.127648
关键词
Hydrophobic deep eutectic solvent; Lithium extraction; Liquid-liquid extraction; Separation; Regeneration
资金
- National Natural Science Foundation of China [21878133, 21908082]
- Natural Science Foundation of Jiangsu Province [BK20190854]
- China Postdoctoral Science Foundation [2020 M671364]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province, China [KYCX19_1622]
This study successfully extracted high concentration Li+ from the mother liquor using a hydrophobic deep eutectic solvent as a novel coextraction reagent, showing good selectivity, stability, and reusability.
Recovering Li+ from the mother liquor obtained during the process of Li2CO3 production has been considered as a promising solution to the shortage of lithium resources. However, as the mother liquor is a complex saline system with high concentration of Li+ (1.42 g/L) and a large amount of Na+ (55.62 g/L), there is no competent method to carry out for the effective utilization of Li+. This work reports a class of hydrophobic deep eutectic solvents (HDESs) formed by tetrabutylammonium chloride (TBAC) and oleic acid (OA), which is a novel coextraction reagent for Li+ extraction. In addition, tributyl phosphate (TBP) is used as extractant and ammonia is applied to regulate pH. TBAC/3OA showed the highest extraction efficiency in single extraction (76.8%) with the ammonia concentration, the volume ratio of organic phase and aqueous phase (O/A phase ratio), and volume fraction of HDES as 1.5 mol/L, 1, and 30%, respectively. Mechanism studies through the UV-vis and FT-IR proved that cation exchange between Li+ and HDES, and Li+ coordination was the dominant force in the separation process. The complexing ability of P = O in TBP led to the selective extraction of Li+. The reusability experiments of organic phase demonstrated that the extraction efficiency was still above 60% after five cycles, indicating the favorable stability of the extraction system. Finally, the separation factor (beta Li/Na) of Li/Na in the mother liquor was 20.5, indicating that the TBP-HDES system has the capability to selectively extract Li+ with high Na/Li ratio. This will help to design possible green HDES for lithium recovery.
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