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1 Polish Journal of Chemical Technology

1 2001

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Extraction of Ir(III) with Cyanex-923 and Cyanex-471X from bromide media and its separation from Pt(IV), Pd(II) and Rh(III)

Duche N. S., Dhadke M. P.

Polish Journal of Chemical Technology

2001

Vol. 3, nr 1

21-25

Iridium(III) was extracted with Cyanex-923 and Cyanex-471X in toluene from bromide media and studied. The quantitative extraction was observed in the range of 5.0 - 6.0 M HBr with 1.0M Cyanex-923 and at 1.3 M Cyanex-471X in toluene, while metal ion was stripped out from organic phase of Cyanex-923 and Cyanex-471X with the mixture of 4.0 M HC1O4 + 2.0 M HNO3 and 6.0 M H2SO4 + 4.0 M HC1 respectively. In both the cases extraction of Ir(III) decreased with the increased concentration of stannous chloride. The thermal study showed that the extraction reactions are exothermic in nature with both the reagents, and the stoichiometric ratio of Ir(III) to Cyanex-923/Cyanex-471X in organic phase was 1:3. The separation of Ir(III) from Pt(IV), Pd(II), and Rh(III) has been also studied.