Enhanced separation of praseodymium and neodymium by kinetic “push and pull” system of A336NO_3-DTPA in a column extractor

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	Enhanced separation of praseodymium and neodymium by kinetic “push and pull” system of A336NO_3-DTPA in a column extractor
	Wang Xiaoqin 1; Huang Kun 1; Cao Wenjuan 1; Sun Pan 1; Sui Na 2; Song Weiyuan 1; Liu Huizhou 1
	2020
Source Publication	Journal of Rare Earths
ISSN	1002-0721
Volume	38 Issue:2 Pages:203
Abstract	A 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 A336NO_3 and DTPA in a column extractor. It is revealed that, when organic extractant A336NO_3 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), β_(Pr/Nd), increased obviously with the time, and could even achieve 21.7. Such an amazing increase in β_(Pr/Nd) value might be due to the extraction rate of Pr(III) by A336NO_3 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 β_(Pr/Nd) value in traditional thermodynamic separation reported in previous literatures is only around 5 or even less, even though using the same extractant A336NO_3 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, LiNO_3 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 A336NO_3 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.
Keyword	Praseodymium Neodymium Kinetic separation A336NO_3 DTPA Rare earths
Language	英语
Funding Project	[National Natural Science Foundation of China] ; [Key Project of Chinese National Programs for Fundamental Research and Development (973 Program)]
Document Type	期刊论文
Identifier	http://ir.ipe.ac.cn/handle/122111/46936
Collection	中国科学院过程工程研究所
Affiliation	1.中国科学院过程工程研究所 2.北京科技大学
First Author Affilication	中国科学院过程工程研究所
Recommended Citation GB/T 7714	Wang Xiaoqin,Huang Kun,Cao Wenjuan,等. Enhanced separation of praseodymium and neodymium by kinetic “push and pull” system of A336NO_3-DTPA in a column extractor[J]. Journal of Rare Earths,2020,38(2):203.
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 A336NO_3-DTPA in a column extractor.Journal of Rare Earths,38(2),203.
MLA	Wang Xiaoqin,et al."Enhanced separation of praseodymium and neodymium by kinetic “push and pull” system of A336NO_3-DTPA in a column extractor".Journal of Rare Earths 38.2(2020):203.

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