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Selective separation of lithium from the high magnesium brine by the extraction system containing phosphate-based ionic liquids
Bai, Ruibing1,2,3; Wang, Junfeng1,2; Wang, Daoguang1,2; Zhang, Yanqiang1,2; Cui, Junjie1,2
2021-11-01
Source PublicationSEPARATION AND PURIFICATION TECHNOLOGY
ISSN1383-5866
Volume274Pages:11
AbstractThe high acidity of stripping is one of the major problems that hinder the industrialization of the tributyl phosphate (TBP) + FeCl3 system for lithium extraction from the salt lake brines with high Mg/Li ratio. In this study, a novel solvent extraction system, trialkylmethylammonium di(2-ethylhexyl)orthophosphinate ([N1888] [P507]) + TBP + FeCl3, was developed to significantly reduce the difficulty of stripping and simplify the extraction process. The conditions of extraction and stripping were systematically studied in the present work. The results showed that Li+ extraction efficiency could reach 61% under the optimal extraction parameters and Li+ stripping ratio was 90% with a relative mild conditions of O/A = 10:1, [HCl]aq = 1.5 mol.L-1. Also, combined with experimental results, FT-IR analysis, and UV analysis, the possible mechanisms of lithium extraction and stripping were put forward. Li+ was extracted from the aqueous phase through the formation of [Li.2TBP][FeCl4] adduct, meanwhile [N1888][P507] was just slightly involved in the extraction step. In the stripping procedure, the interaction between [FeCl4]- and [Li.2TBP]+ might be destroyed, and new possible complexes, [Li.2TBP]+, and [FeCl4.TBP.P507]2-/[FeCl4.P507]2- were formed in the organic phase. Additionally, the extraction efficiency of Li+ remained above 70% while the organic phase was reused for six cycles. Compared with the traditional system, the addition of [N1888][P507] resulted in a slight decrease of Li+ extraction efficiency (about 5%), the stripping acidity significantly reduced from 6 mol.L-1 HCl to 1.5 mol.L-1 HCl. This new extraction system showed a promising performance in selective extracting and easy stripping in lithium separation from the salt lake brines with high Mg/Li ratio.
KeywordIonic liquid Solvent extraction Lithium Stripping High Mg brine
DOI10.1016/j.seppur.2021.119051
Language英语
WOS KeywordSALT LAKE BRINE ; SOLVENT-EXTRACTION ; RATIO BRINES ; RECOVERY ; KEROSENE
Funding ProjectNational Natural Science Foundation of China[21978302] ; National Natural Science Foundation of China[U20A20149] ; Innovation Academy for Green Manufacture, Chinese Academy of Sciences[IAGM2020DB05] ; State Key Laboratory of Multiphase Complex Systems[MPCS2019D15]
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
Funding OrganizationNational Natural Science Foundation of China ; Innovation Academy for Green Manufacture, Chinese Academy of Sciences ; State Key Laboratory of Multiphase Complex Systems
WOS IDWOS:000668929400008
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/49404
Collection中国科学院过程工程研究所
Corresponding AuthorWang, Junfeng
Affiliation1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing Key Lab Ion Liquids Clean Proc, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Innovat Acad Green Manufacture, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Sino Danish Coll, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Bai, Ruibing,Wang, Junfeng,Wang, Daoguang,et al. Selective separation of lithium from the high magnesium brine by the extraction system containing phosphate-based ionic liquids[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2021,274:11.
APA Bai, Ruibing,Wang, Junfeng,Wang, Daoguang,Zhang, Yanqiang,&Cui, Junjie.(2021).Selective separation of lithium from the high magnesium brine by the extraction system containing phosphate-based ionic liquids.SEPARATION AND PURIFICATION TECHNOLOGY,274,11.
MLA Bai, Ruibing,et al."Selective separation of lithium from the high magnesium brine by the extraction system containing phosphate-based ionic liquids".SEPARATION AND PURIFICATION TECHNOLOGY 274(2021):11.
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