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http://dx.doi.org/10.7844/kirr.2019.28.2.46

Selective Recovery of Platinum Group Metals by Solvent Extraction and Electrolysis in Non-aqueous Solution Based on Ionic Liquids  

Park, Gwang-won (Electronic Materials Division, Samsung SDI)
Park, Jesik (B21TFT, Hyundai Mobis)
Lee, Churl Kyoung (School of Advanced Materials Sci. & Eng., Kumoh National Institute of Technology)
Publication Information
Resources Recycling / v.28, no.2, 2019 , pp. 46-53 More about this Journal
Abstract
In this study, the extraction and reduction behavior of platinum group metals in a non-aqueous solvent based on ionic liquids was investigated in order to confirm a new extraction technology of platinum group metals. Platinum was selectively extracted using an ionic liquid $[C_4mim]PF_6$ from a mixed solution of $PdCl_2$, $PtCl_4$ and $RhCl_3$ dissolved with concentration ratio of 10:1:0.5 M. After stripping of the metals by 1 M $HNO_3$ solution, the platinum was preferentially reduced by aqueous electrolysis on gold electrode at -0.8 V (vs. Pt-QRE). The residual palladium and rhodium were transferred to ionic liquid of $[C_4mim]Cl$. The metallic palladium and rhodium could be sequentially reduced on gold and STS304 as working electrodes by non-aqueous electrolysis, respectively.
Keywords
platinum group metals; ionic liquid; solvent extraction; electrolysis; selective recovery;
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