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Metals 2019, 9(2), 187; https://doi.org/10.3390/met9020187

Kinetic Investigation of Silver Recycling by Leaching from Mechanical Pre-Treated Oxygen-Depolarized Cathodes Containing PTFE and Nickel

1
Institute of Process Metallurgy and Metal Recycling IME, RWTH Aachen University, Intzestraße 3, 52056 Aachen, Germany
2
Unit of Mineral Processing AMR, RWTH Aachen University, Lochnerstraße 4-20 Haus C, 52064 Aachen, Germany
*
Author to whom correspondence should be addressed.
Received: 26 November 2018 / Revised: 28 January 2019 / Accepted: 31 January 2019 / Published: 5 February 2019
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Abstract

This paper focuses on the recycling of silver from spent oxygen-depolarized cathodes through an innovative combination of pre-treatment methods and leaching. A silver- and polytetrafluorethylene (PTFE)-rich fraction was produced by cryogenic milling, screening, and magnetic separation. In order to understand the kinetic leaching mechanism, the silver-rich fraction was leached by different concentrations of nitric acid and hydrogen peroxide. Results showed that nickel influences the silver leaching. This leads to complex reaction systems, which cannot be described by the Arrhenius law. View Full-Text
Keywords: oxygen-depolarized cathodes; silver leaching; cryogenic pre-treatment; negative activation energy oxygen-depolarized cathodes; silver leaching; cryogenic pre-treatment; negative activation energy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Schosseler, J.; Trentmann, A.; Friedrich, B.; Hahn, K.; Wotruba, H. Kinetic Investigation of Silver Recycling by Leaching from Mechanical Pre-Treated Oxygen-Depolarized Cathodes Containing PTFE and Nickel. Metals 2019, 9, 187.

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