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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.12 [2005] >
IJCT Vol.12(6) [November 2005] >
| Title: | Extraction of uranium from acidic media with a novel synergistic mixture of di-nonyl phenyl phosphoric acid and tri-n-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 |
| IPC Code: | 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-n-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 UO2 (HR2)2.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. |
| Page(s): | 708-712 |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.12(6) [November 2005]
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