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Korean Journal of Metals and Materials > Volume 54(10); 2016 > Article
Korean Journal of Metals and Materials 2016;54(10): 768-774. doi: https://doi.org/10.3365/KJMM.2016.54.10.768
Effect of HCl Concentration on the Oxidation of LIX 63 and the Subsequent Separation of Pd(II), Pt(IV), Ir(IV) and Rh(III) by Solvent Extraction
Thi Hong Nguyen, Man Seung Lee
Department of Advanced Material Science & Engineering, Institute of Rare Metal, Mokpo National University, Jeollanamdo 58554, Republic of Korea
Correspondence  Man Seung Lee ,Tel: +82-61-450-2492, Email: mslee@mokpo.ac.kr
Received: 6 April 2016;  Accepted: 14 May 2016.  Published online: 5 October 2016.
ABSTRACT
During the selective extraction of Pd(II) by LIX 63 from 6 M HCl solutions containing platinum group metals, an oxidation-reduction reaction occurs between the LIX 63 and Ir(IV). Since the reduced Ir(III) cannot be extracted by solvating and amine extractants, the oxidation-reduction reaction has a significant effect on the separation of Pt(IV), Ir(IV) and Rh(III). Therefore, the effect of HCl concentration on the reduction of Ir(IV) during the extraction with LIX 63 was investigated at 3 and 6 M HCl solutions. The extraction behavior of Iridium by Aliquat 336 from the Pd(II) free raffinate showed that the percentage of iridium extraction rapidly decreased when HCl concentration was increased from 3 to 6 M, indicating that more Ir(IV) was reduced to Ir(III). Extraction schemes for the separation of Pt(IV), iridium and Rh(III) by Aliquat 336 from 3 and 6 M HCl solutions were investigated.
Keywords: platinum, iridium, rhodium, LIX 63, separation
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