|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Rare Metal Extraction & Processing
||Developed commercial processes to recover Au, Ag, Pt and Pd from e-waste.
||Rekha Panda, Manis Kumar Jha, Jae-chun Lee, Devendra Deo Pathak
|On-Site Speaker (Planned)
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.
||Recycling and Secondary Recovery, Hydrometallurgy, Extraction and Processing