Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/8695
Title: Extraction of uranium from acidic media with a novel synergistic mixture of di-nonyl phenyl phosphoric acid and tri-<i style="">n</i>-octyl phosphine oxide
Authors: Mishra, S L
Vijayalakshmi, R
Singh, H
Keywords: Uranium
solvent extraction
DNPPA
TOPO
synergistic mixture
Issue Date: Nov-2005
Publisher: CSIR
Series/Report no.: C22B60/02
Abstract: The extraction of uranium from aqueous acidic solutions of nitrate, perchlorate, sulphate, chloride and phosphate with a novel synergistic mixture of di-nonyl phenyl phosphoric acid (DNPPA) and tri-<i style="">n</i>-octyl phosphine oxide (TOPO) in an aliphatic hydrocarbon diluent has been studied at varying concentrations of aqueous acids, extractant and uranium. The mole ratio [DNPPA]:[TOPO] has been found to have a significant effect on extraction of uranium. Maximum extraction was found at 2:1 mole ratio and no antagonistic effect was observed at higher concentration of TOPO. The extracted species has been found to be UO<sub>2 </sub>(HR<sub>2</sub>)<sub>2</sub>.TOPO. The extraction order of uranium in aqueous media follows the sequence: perchlorate > nitrate > chloride > sulphate > phosphate. The selectivity of uranium with respect to other metals including Zn, Cu, Ni, Ca, and Fe has been investigated as a function of concentrations of sulphuric acid and extractant. Based on these findings, extraction of uranium has been carried out from leach liquor generated at an industrial plant, using 0.03 M DNPPA + 0.015 M TOPO with high recovery (>99%), selectivity and having added advantage of low inventory cost on extractants.
Description: 708-712
URI: http://hdl.handle.net/123456789/8695
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.12(6) [November 2005]

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