|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||REWAS 2022: Recovering the Unrecoverable
||Recovery of Precious Metal Silver from Scrap Computer Keyboards
||Rekha Panda, Om Shankar Dinkar, Pankaj Kumar Choubey, Rukshana Parween, Manis Kumar Jha, Devendra Deo Pathak
|On-Site Speaker (Planned)
Silver (Ag) is extensively used in manufacturing of electronic goods due to its low-cost and conductivity. In view of the escalating demand, stringent environmental rules and limited primary sources of Ag, present paper is focused on the development of hydrometallurgical process flow-sheet to extract Ag from scrap computer keyboards. These keyboards contain ~0.4% Ag. Initially, scrap keyboards were dismantled to separate the Mylar sheet containing Ag. The same was pyrolysed at 300 °C for 2 h to get enriched metallic part (~2%). About 99.99% Ag was leached using 2 M HNO3 at 60 °C within 30 min in closed and proper condensed system. Separation techniques (precipitation/ cementation) could be use to obtain high purity Ag salt/ metal. Based on the laboratory scale experiments, the process flow-sheet developed is economical, eco-friendly and has potential to be translated to industry for commercial exploitation after scale up/ pilot trial.
||Extraction and Processing, Hydrometallurgy, Recycling and Secondary Recovery