Abstract
Silver (Ag) is extensively used in manufacturing of electronic goods due to its low cost and conductivity. In view of the escalating demand, stringent, environment rules, and limited sources of Ag, the present paper is focused on the development of hydrometallurgical process flow-sheet to extract Ag from scrap computer keyboards. These keyboards contain ~0.4% of Ag. Initially, keyboards were dismantled to separate the Mylar sheets scontaining Ag. The same were pyrolyzed at 300 °C for 2 h to get enriched metallic part. About 99.99% Ag was leached using 2 M HNO3 at 60 °C within 30 min in close and proper condensed system. Separation techniques (precipitation/cementation) could be used to obtain pure 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.
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Acknowledgements
Authors are thankful to Director, CSIR-National Metallurgical Laboratory, Jamshedpur, India, for giving permission to publish this paper. One of the authors Ms. Rekha Panda would like to extend her sincere gratitude to CSIR, New Delhi, for providing Senior Research Fellowship (Grant: 31/10(64)/2017-EMR-I) to carry out this research work.
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Panda, R., Dinkar, O.S., Choubey, P.K., Parween, R., Jha, M.K., Pathak, D.D. (2022). Recovery of Precious Metal Silver from Scrap Computer Keyboards. In: Lazou, A., Daehn, K., Fleuriault, C., Gökelma, M., Olivetti, E., Meskers, C. (eds) REWAS 2022: Develo** Tomorrow’s Technical Cycles (Volume I). The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-92563-5_9
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DOI: https://doi.org/10.1007/978-3-030-92563-5_9
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