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Extraction kinetics and kinetic separation of La(III), Gd(III), Ho(III) and Lu(III) from chloride medium by HEHEHP
Cao, Wenjuan1,2; Huang, Kun1,3; Wang, Xiaoqin1,2; Liu, Huizhou1
2021-10-01
Source PublicationJOURNAL OF RARE EARTHS
ISSN1002-0721
Volume39Issue:10Pages:1264-1272
AbstractAccording to the tetrad-effect, 14 elements of lanthanides can be divided into four groups. In our previous study, a new approach was proposed for the kinetic separation of four rare earth ions La(III), Gd(III), Ho(III) and Lu(III) coming from four groups. In that study, four rare-earth ions were kinetically separated from their coexisting mixed aqueous solutions, by performing liquid-column elution using the aqueous solution containing four lanthanide rare-earth ions as the stationary phase and the dispersed organic oil droplets containing HEHEHP (2-ethyl hexyl phosphonic acid mono 2-ethyl hexyl ester) extractant as the mobile phase. The study of extraction kinetics is very important for understanding the kinetic separation of rare earth ions, which was carried out in this paper. The extraction kinetics of La(III), Gd(III), Ho(III) and Lu(III) by HEHEHP diluted in heptane were investigated using single drop method. The different parameters affecting the extraction rate such as column length, specific interfacial area, rare earth ion concentration, extractant concentration, hydrogen ion concentration and temperature were separately studied and the rate equations are deduced. It is first order with respect to rare earth ion and HEHEHP concentrations, and negative first order with respect to hydrogen ion concentrations. The rate constants at 293.15 K are 10(-6.23), 10(-5.73), 10(-5.58) and 10(-5.43), respectively. The experimental results demonstrate that the extraction rate of La(III), Gd(III), Ho(III) or Lu(III) is diffusion-controlled, and the extraction reaction takes place at the interface rather than in the bulk phase. The extraction model was proposed. Besides, the kinetic separation of rare earth ions by HEHEHP oil drops was discussed. (C) 2020 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.
KeywordExtraction kinetics HEHEHP Single drop Rare earth ions
DOI10.1016/j.jre.2020.10.021
Language英语
WOS KeywordCONSTANT INTERFACIAL CELL ; LIQUID-LIQUID-EXTRACTION ; ACID ; MECHANISM ; KEROSENE ; D2EHPA ; COMPLEX ; FE(III) ; ESTER ; IONS
Funding ProjectNational Natural Science Foun-dation of China[52074031] ; National Natural Science Foun-dation of China[51574213] ; National Natural Science Foun-dation of China[51074150] ; Key Project of Chinese National Programs for Fundamental Research and Development[2012CBA01203]
WOS Research AreaChemistry
WOS SubjectChemistry, Applied
Funding OrganizationNational Natural Science Foun-dation of China ; Key Project of Chinese National Programs for Fundamental Research and Development
WOS IDWOS:000694728000002
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/50141
Collection中国科学院过程工程研究所
Corresponding AuthorHuang, Kun
Affiliation1.Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing 100083, Peoples R China
Recommended Citation
GB/T 7714
Cao, Wenjuan,Huang, Kun,Wang, Xiaoqin,et al. Extraction kinetics and kinetic separation of La(III), Gd(III), Ho(III) and Lu(III) from chloride medium by HEHEHP[J]. JOURNAL OF RARE EARTHS,2021,39(10):1264-1272.
APA Cao, Wenjuan,Huang, Kun,Wang, Xiaoqin,&Liu, Huizhou.(2021).Extraction kinetics and kinetic separation of La(III), Gd(III), Ho(III) and Lu(III) from chloride medium by HEHEHP.JOURNAL OF RARE EARTHS,39(10),1264-1272.
MLA Cao, Wenjuan,et al."Extraction kinetics and kinetic separation of La(III), Gd(III), Ho(III) and Lu(III) from chloride medium by HEHEHP".JOURNAL OF RARE EARTHS 39.10(2021):1264-1272.
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