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Received March 24, 2016
Accepted April 30, 2016
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Selective recovery of Fe(III), Pd(II), Pt(IV), Rh(III) and Ce(III) from simulated leach liquors of spent automobile catalyst by solvent extraction and cementation
Department of Advanced Materials Science & Engineering, Institute of Rare Metal, Mokpo National University, Chonnam 58554, Korea 1Department of Chemistry, KU Leuven-University of Leuven, Celestijnenlaan 200F, P. O. Box 2404, B-3001 Leuven, Belgium
mslee@mokpo.ac.kr
Korean Journal of Chemical Engineering, September 2016, 33(9), 2684-2690(7)
https://doi.org/10.1007/s11814-016-0123-5
https://doi.org/10.1007/s11814-016-0123-5
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Abstract
A hydrometallurical process was developed to recover Fe(III), Pd(II), Pt(IV), Rh(III) and Ce(III) from the leach liquor of spent automobile catalysts. Fe(III) was first separated by extraction with tri-butyl-phosphate (TBP). Extraction of the raffinate with tri-isooctylamine (Alamine 308) led to co-extraction of Pd(II) and Pt(IV). They were separately stripped from the loaded Alamine 308 by using a mixture of HCl and thiourea with different concentration. After the recovery of HCl in the raffinate by extraction with tri-2-ethylhexyl amine (TEHA), Rh(III) was recovered by cementation with zinc metal powder. A process flow sheet with the corresponding McCabe-Thiele plots for extraction and stripping was proposed.
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