Recovery of Precious and Base Metals from Waste Printed Circuit Boards Using a Sequential Leaching Procedure

This paper considers the issue of recycling of waste printed circuit boards (WPCBs) containing precious and base metals in appreciable amounts. High-pressure oxidative leaching (HPOL) with dilute sulfuric acid resulted in removal of a significant amount of base metals from a WPCB ash sample obtained...

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Bibliographic Details
Published in:JOM (1989) 2018-02, Vol.70 (2), p.124-128
Main Authors: Batnasan, Altansukh, Haga, Kazutoshi, Shibayama, Atsushi
Format: Article
Language:English
Subjects:
Aluminum
Cellular telephones
Chemistry/Food Science
Circuit boards
Dilution
Earth Sciences
Efficiency
Engineering
Environment
Experiments
Gold
Incineration
Leaching
Metals
Noble metals
Oxidation
Palladium
Physics
Precious metals
Printed circuit boards
Printed circuits
Raw materials
Reagents
Silver
Silver mines
Studies
Sulfuric acid
Thioureas
Toward Resources and Processes Sustainability: Part I
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Summary:This paper considers the issue of recycling of waste printed circuit boards (WPCBs) containing precious and base metals in appreciable amounts. High-pressure oxidative leaching (HPOL) with dilute sulfuric acid resulted in removal of a significant amount of base metals from a WPCB ash sample obtained by incineration at 800°C. The parameters investigated in the precious metal leaching from WPCB residue after HPOL included the sulfuric acid concentration, thiourea concentration, oxidant concentration, leaching temperature, and leaching time. Recovery of gold, silver, and palladium of 100%, 81%, and 13% from the WPCB residue sample was achieved by thiourea leaching under optimized conditions. The results show that the efficiency of precious metal dissolution from the WPCB sample using thiourea solution depended strongly on the concentration of both thiourea and oxidant.
ISSN:1047-4838
1543-1851
DOI:10.1007/s11837-017-2694-y