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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Rare Metal Extraction & Processing
Presentation Title Developed Commercial Processes to Recover Au, Ag, Pt and Pd from E-waste.
Author(s) Rekha Panda, Manis Kumar Jha, Jae-chun Lee, Devendra Deo Pathak
On-Site Speaker (Planned) Rekha Panda
Abstract Scope Due to the supply gap towards increasing demand as well as loss of precious metals by illegal recycling, present research reports application oriented processes developed at CSIR-NML, India to recover precious metals from small components of e-waste containing ~0.1-0.8% Ag, ~0.03-0.9% Au, ~0.01-0.02% Pd, ~0.0003-0.0005% Pt and related effluent. Firstly, ~99.99% Au was recovered from plated e-waste using the process of selective leaching followed by charcoal adsorption and heat treatment whereas the second process consists of dismantling, physical/ chemical pre-treatment of e-waste followed by hydrometallurgical processing to recover 99% Ag, 99.9% Au, 95% Pd and 90% Pt. Apart from the above, leaching and selective precipitation were used to recover ~95% Ag from waste computer keyboards. The effluent generated during the e-waste processing was found to contain ~8-10 mg/L Au, which was also recovered using ion-exchange technique. All processes presented are scientifically validated and after scale-up studies commercially viable.
Proceedings Inclusion? Planned:
Keywords Recycling and Secondary Recovery, Hydrometallurgy, Extraction and Processing

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