Hydrometallurgical recovery of silver and gold from waste printed circuit boards and treatment of the wastewater in a biofilm reactor: An integrated pilot application

A hydrometallurgical process for the recovery of gold and silver from waste printed circuit boards (PCBs) was experimentally verified and tested at pilot scale. The process comprises four sequential leaching stages; the first two based on HCl, correspond to base metals (e.g. Sn, Cu) removal, while t...

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Bibliographic Details
Published in:Journal of environmental management 2023-10, Vol.344, p.118334-118334, Article 118334
Main Authors: Vlasopoulos, Dimitrios, Mendrinou, Panagiota, Oustadakis, Paschalis, Kousi, Pavlina, Stergiou, Athanasios, Karamoutsos, Spyridon-Dionysios, Hatzikioseyian, Artin, Tsakiridis, Petros E., Remoundaki, Emmanouella, Agatzini-Leonardou, Styliani
Format: Article
Language:English
Subjects:
ambient temperature
aqua regia
biofilm
chlorides
circular economy
Denitrification
electronic wastes
energy
environmental management
Gold
Hydrometallurgy
liquids
nitrates
Printed circuit boards
Silver
wastewater
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Summary:A hydrometallurgical process for the recovery of gold and silver from waste printed circuit boards (PCBs) was experimentally verified and tested at pilot scale. The process comprises four sequential leaching stages; the first two based on HCl, correspond to base metals (e.g. Sn, Cu) removal, while the third is based on HNO3 for Ag leaching and the final on aqua regia for Au leaching. After base metals leaching, the solid residue, enriched in silver and gold about 5 times, contained silver almost quantitively as insoluble AgCl and significant losses (Ag loss
ISSN:0301-4797
1095-8630
DOI:10.1016/j.jenvman.2023.118334