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

Metals

Anna Trentmann¹  Bernd Friedrich¹  Jil Schosseler¹  Klaus Hahn²  Hermann Wotruba² 

[1] Institute of Process Metallurgy and Metal Recycling IME, RWTH Aachen University, Intzestraße 3, 52056 Aachen, Germany;Unit of Mineral Processing AMR, RWTH Aachen University, Lochnerstraße 4-20 Haus C, 52064 Aachen, Germany;

关键词: oxygen-depolarized cathodes;    silver leaching;    cryogenic pre-treatment;    negative activation energy;   

DOI  :  10.3390/met9020187

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown