Recovery of platinum group metal value via potassium iodide leaching

Patel, Anant and Dawson, Richard (2015) Recovery of platinum group metal value via potassium iodide leaching. Hydrometallurgy, 157. pp. 219-225. ISSN 0304-386X

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Platinum recovery from secondary sources such as end-of-life polymer electrolyte fuel cells (PEMFCs) via electrowinning and chemical dissolution in deoxygenated 4M potassium iodide with varying added iodine content was investigated. Previous research in this field has shown complete platinum recovery from model systems is possible, but further study was necessary to determine the process’ viability with Pt containing devices. The work presented here investigated the leach rate of platinum black deposited on an electrochemical quartz crystal microbalance (EQCM) as well as the effective recovery of Pt from untested and end-of-life polymer electrolyte membrane fuel cells. Platinum black dissolution rates were found to be dependent on added iodine content, with higher concentrations accelerating the reaction. Platinum recovery from leached materials, as determined by aqua regia digestion, was found to be 98.7% and 96.7% for untested and end-of-life PEMFCs, respectively. Results indicate higher iodine concentrations continuously improved recovery efficiency, but increasing iodine concentration above 5mM resulted in comparatively minor improvements.

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Journal Article
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This is the author’s version of a work that was accepted for publication in Hydrometallurgy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Hydrometallurgy, 157, 2015 DOI: 10.1016/j.hydromet.2015.08.008
Uncontrolled Keywords:
?? platinum dissolution iodideiodinepemfcseqcmmaterials chemistryindustrial and manufacturing engineeringmetals and alloys ??
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15 Sep 2015 08:14
Last Modified:
25 Feb 2024 00:48