CAS OpenIR
Enhanced separation of praseodymium and neodymium by kinetic "push and pull" system of [A336][NO3]-DTPA in a column extractor
Wang, Xiaoqin1,3; Huang, Kun1,2; Cao, Wenjuan1,3; Sun, Pan1,3; Sui, Na2; Song, Weiyuan1,3; Liu, Huizhou1
2020-02-01
Source PublicationJOURNAL OF RARE EARTHS
ISSN1002-0721
Volume38Issue:2Pages:203-212
AbstractA new approach was suggested in present work for improving the separation between Pr(III) and Nd(III) by a so-called kinetic "push and pull" system consisting of [A336][NO3] and DTPA in a column extractor. It is revealed that, when organic extractant [A336][NO3] is continuously pumped into the column extractor in the form of dispersed oil droplets and at the same time DTPA was injected into the aqueous feed solution when the extraction was just started, the separation factor of Pr(III) to Nd(III), beta(Pr/Nd), increased obviously with the time, and could even achieve 21.7. Such an amazing increase in beta(Pr/Nd) value might be due to the extraction rate of Pr(III) by [A336][NO3] oil droplets being faster than that of Nd(III), while the complexing rate of Nd(III) with DTPA in the aqueous solutions being faster than that of Pr(III). The opposite order of the two rates for Pr(III) and Nd(III) result in their kinetic "push and pull" separation. In contrast, the beta(Pr/Nd) value in traditional thermodynamic separation reported in previous literatures is only around 5 or even less, even though using the same extractant [A336][NO3] and DTPA but by previously adding DTPA into the aqueous feed solutions for pre-complexing of Pr(III) and Nd(III). Various effects from the pH and addition amount of DTPA aqueous solutions, LiNO3 concentrations in initial aqueous feed solutions, the initial concentration ratios of Pr(III) to Nd(III) ions, the initial pH of aqueous feed solutions, and the concentrations of [A336][NO3] in organic phases, on the kinetic separation of Pr(III) and Nd(III) are discussed. The present work highlights a promising approach for separation of rare earths or other targets with extreme similarity in physicochemical properties. (C) 2020 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.
KeywordPraseodymium Neodymium Kinetic separation [A336][NO3] DTPA Rare earths
DOI10.1016/j.jre.2019.03.021
Language英语
WOS KeywordRARE-EARTH IONS ; SOLVENT-EXTRACTION ; SELECTIVE EXTRACTION ; DIETHYLENETRIAMINEPENTAACETIC ACID ; ND ; ADSORPTION ; BEHAVIOR ; ELEMENTS ; YTTRIUM ; LIGAND
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)[2012CBA01203]
WOS Research AreaChemistry
WOS SubjectChemistry, Applied
Funding OrganizationNational Natural Science Foundation of China ; Key Project of Chinese National Programs for Fundamental Research and Development (973 Program)
WOS IDWOS:000507464100013
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/38826
Collection中国科学院过程工程研究所
Corresponding AuthorHuang, Kun
Affiliation1.Chinese Acad Sci, CAS Key Lab Green Proc & Engn, Inst Proc Engn, Beijing 100190, Peoples R China
2.Univ Sci & Technol Beijing, Sch Met & Ecol Engn, 30 Xueyuan Rd, Beijing 100083, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Wang, Xiaoqin,Huang, Kun,Cao, Wenjuan,et al. Enhanced separation of praseodymium and neodymium by kinetic "push and pull" system of [A336][NO3]-DTPA in a column extractor[J]. JOURNAL OF RARE EARTHS,2020,38(2):203-212.
APA Wang, Xiaoqin.,Huang, Kun.,Cao, Wenjuan.,Sun, Pan.,Sui, Na.,...&Liu, Huizhou.(2020).Enhanced separation of praseodymium and neodymium by kinetic "push and pull" system of [A336][NO3]-DTPA in a column extractor.JOURNAL OF RARE EARTHS,38(2),203-212.
MLA Wang, Xiaoqin,et al."Enhanced separation of praseodymium and neodymium by kinetic "push and pull" system of [A336][NO3]-DTPA in a column extractor".JOURNAL OF RARE EARTHS 38.2(2020):203-212.
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