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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3030
Title: Solvent extraction and separation of tervalent Lanthanides and Yttrium using Cyanex 923
Authors: Gupta B.
Malik P.
Deep A.
Published in: Solvent Extraction and Ion Exchange
Abstract: The paper embodies extraction behavior of some tervalent lanthanides [La, Ce, Nd, Eu, Gd, Ho, Yb] along with Y(III) from HNO3, HCI, H2SO4, and H3PO4 media in a toluene solution of Cyanex 923. The effect of some important variables like equilibration time, nature of diluent and the concentration of acid, extractant and metal ion on the extraction is investigated. Based on the partition data the stoichiometry of the extracting species is formulated as Ln(NO3)3 2Cyanex 923. The reagents like 5.0 mol L-1 HNO3, 0.5 mol L-1 H2SO4/HCI and 1.0 mol L-1 H3PO4 have been found effective for stripping of the metal ions. Cyanex 923 is stable even after prolonged acid contact and the extraction efficiency remains unaffected even after 20 recycling steps. Based on the partition data the lanthanides can be divided into four distinct groups namely light (La, Ce, Nd), middle (Eu, Gd), holmium (Ho), and heavy (Yb). The separation factors indicate that the separation of light and heavy fractions can be conveniently achieved from all the four investigated acid media. However, the separation of lanthanides into the said four fractions is more apparent from nitric acid medium. The data have been successfully employed for the separation of lanthanides and yttrium in different fractions from a synthetic mixture.
Citation: Solvent Extraction and Ion Exchange (2003), 21(2): 239-258
URI: https://doi.org/10.1081/SEI-120018948
http://repository.iitr.ac.in/handle/123456789/3030
Issue Date: 2003
Keywords: Cyanex 923
Extraction
Lanthanides
Separation
Yttrium
ISSN: 7366299
Author Scopus IDs: 7402195167
7103280667
6602909701
Author Affiliations: Gupta, B., Department of Chemistry, Indian Institute of Technology, Uttaranchal, Roorkee 247 667, India
Malik, P., Department of Chemistry, Indian Institute of Technology, Uttaranchal, Roorkee 247 667, India
Deep, A., Department of Chemistry, Indian Institute of Technology, Uttaranchal, Roorkee 247 667, India
Funding Details: The authors are thankful to Cytec Inc., Canada for providing the sample of Cyanex 923. The financial assistance of Council of Scientific and Industrial Research, New Delhi, India is gratefully acknowledged. The authors are obliged of Professor S. N. Tandon, Chemistry Department, IIT Roorkee, for his help during the course of work.
Corresponding Author: Gupta, B.; Department of Chemistry, Indian Institute of Technology, Uttaranchal, Roorkee 247 667, India; email: bvgcyfcy@iitr.ernet.in
Appears in Collections:Journal Publications [CY]

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