CAS OpenIR
Separation of adjacent rare earth elements enhanced by "external push-pull" extraction system: An example for the separation of Pr and Nd
Sun, Pan1,3; Huang, Kun1,2; Liu, Huizhou2
2019-11-01
Source PublicationHYDROMETALLURGY
ISSN0304-386X
Volume189Pages:9
AbstractSeparation of adjacent rare-earth elements, such as Pr and Nd, is extremely difficult due to the similarity in their physicochemical properties. Enhanced separation of adjacent rare-earth elements based on the "push-pull effect" by addition of water-soluble complexing agents was an effective strategy in traditional organic-aqueous two-phase extraction. However, environmental pollution is serious due to the residual of complexing agent in the extraction raffinates. In present work, a novel "external push-pull" extraction system, composed of three coexisting liquid phases, P507 organic phase, ionic liquid (tributyl-methyl ammonium nitrate, N4441NO3)-rich phase and NaNO3 aqueous solutions, is suggested to improve the separation between Pr and Nd. It is revealed that Nd and Pr can be enriched respectively into the P507 organic top phase and N4441NO3-rich ionic liquid middle phase in the external push-pull extraction system, owing to a so-called "external push-pull effect" from a reversed extraction selectivity of P507 organic phase and N4441NO3 ionic liquid-rich phase towards Nd and Pr, respectively. Compared to traditional organic-water two-phase systems, the separation factor of Pr to Nd in the suggested external push-pull extraction system could increase obviously to 3.5 or even more. Various effects from the aqueous pH, NaNO3 concentration, the initial concentration ratios of Pr to Nd in feed aqueous solutions, and the addition amount of N4441NO3, the volume of P507 organic phase on the separation between Pr and Nd are discussed. In addition, reversal extraction of rare earth ions in the ionic liquid-rich phase is found to be closely related to the complexation behavior of rare earth ions with NO3- ions by using molecular dynamic simulations. Based on this work, a possibility for extraction and separation of 14 rare-earth element ions from their coexisting aqueous solutions using the suggested external push-pull extraction system is also explored. The present work highlights a novel green strategy for improving the separation of adjacent rare-earth elements.
KeywordRare earth Pr and Nd Separation Push-pull effect
DOI10.1016/j.hydromet.2019.105136
Language英语
WOS KeywordSOLVENT-EXTRACTION ; CHLORIDE SOLUTION ; CYANEX 272 ; IONS ; LANTHANUM ; AMINE
Funding ProjectNational Natural Science Foundation of China[51574213] ; National Natural Science Foundation of China[51074150] ; Key Project of Chinese National Programs for Fundamental Research and Development (973 Program)[2013CB632602]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China ; Key Project of Chinese National Programs for Fundamental Research and Development (973 Program)
WOS IDWOS:000496341300032
PublisherELSEVIER
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/39086
Collection中国科学院过程工程研究所
Corresponding AuthorHuang, Kun
Affiliation1.Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing 100083, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Sun, Pan,Huang, Kun,Liu, Huizhou. Separation of adjacent rare earth elements enhanced by "external push-pull" extraction system: An example for the separation of Pr and Nd[J]. HYDROMETALLURGY,2019,189:9.
APA Sun, Pan,Huang, Kun,&Liu, Huizhou.(2019).Separation of adjacent rare earth elements enhanced by "external push-pull" extraction system: An example for the separation of Pr and Nd.HYDROMETALLURGY,189,9.
MLA Sun, Pan,et al."Separation of adjacent rare earth elements enhanced by "external push-pull" extraction system: An example for the separation of Pr and Nd".HYDROMETALLURGY 189(2019):9.
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