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Korean Journal of Metals and Materials > Volume 55(4); 2017 > Article
Korean Journal of Metals and Materials 2017;55(4): 247-255. doi: https://doi.org/10.3365/KJMM.2017.55.4.247
Separation and Recovery of Precious Metals from Leach Liquors of Spent Electronic Wastes by Solvent Extraction
Thi Hong Nguyen1,2, Lingyun Wang1, Man Seung Lee1
1Department of Advanced Materials Science & Engineering, Institute of Rare Metal, Mokpo National University, Jeonnam 58554, Republic of Korea
2College of Natural Sciences, Can Tho University, Can Tho City, Viet Nam
Correspondence  Man Seung Lee ,Tel: +82-61-450-2492, Email: mslee@mokpo.ac.kr
Received: 18 August 2016;  Accepted: 2 November 2016.  Published online: 6 April 2017.
ABSTRACT
Solvent extraction was employed to recover precious metals (Au (III), Pd (II) and Pt (IV)) from the leach solution of spent electronic wastes containing Cu (II), Cr (III) and Fe (III). First, pure Fe (III) and Au (III) were recovered by simultaneous extraction with Cyanex 923 followed by selective stripping with HCl and Na2S2O3. Second, Pt (IV), Pd (II) and Cu (II) were extracted by Alamine 336 from the raffinate. After the removal of Cu (II) by stripping with weak HCl, Pd (II) and Pt (IV) were separately stripped by controlling the concentration of thiourea in the mixture with HCl. A process flow sheet for the separation of precious metals was proposed.
Keywords: gold, platinum, palladium, separation, solvent extraction
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