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

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Abstract

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.

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Acknowledgements

The authors are grateful to the Japan Society for the Promotion of Science (JSPS) for financial support of the program, New Frontier Leaders for Rare-Metals and Resources.

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Authors and Affiliations

  1. Graduate School of International Resource Sciences, Akita University, 1-1 Tegata Gakuen machi, Akita, 010-8502, Japan

    Altansukh Batnasan & Atsushi Shibayama

  2. Graduate School of Engineering Science, Akita University, 1-1 Tegata Gakuen machi, Akita, 010-8502, Japan

    Kazutoshi Haga

Authors
  1. Altansukh Batnasan
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  2. Kazutoshi Haga
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  3. Atsushi Shibayama
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Corresponding author

Correspondence to Altansukh Batnasan.

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Batnasan, A., Haga, K. & Shibayama, A. Recovery of Precious and Base Metals from Waste Printed Circuit Boards Using a Sequential Leaching Procedure. JOM 70, 124–128 (2018). https://doi.org/10.1007/s11837-017-2694-y

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  • DOI: https://doi.org/10.1007/s11837-017-2694-y

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