Leaching and Adsorption of Gold from Waste Printed Circuit Boards Using Iodine-Iodide Solution and Activated Carbon

Authors

  • Batnasan Altansukh Akita University
  • Kazutoshi Haga Akita University
  • Narankhuu Ariunbolor Akita University
  • Shigeru Kawamura Akita University
  • Atsushi Shibayama Akita University

DOI:

https://doi.org/10.4186/ej.2016.20.4.29

Keywords:

Gold, iodine-iodide, activated carbon, high pressure oxidative leaching.

Abstract

Iodine-iodide leaching and activated carbon adsorption processes for recovery of gold (Au) from waste printed circuit boards (WPCBs) were discussed in this paper. A pressure oxidative acid leaching (POAC) was carried out in an autoclave using diluted sulfuric acid (1M H2SO4) solution in order to remove high concentrations of some base metals especially copper (Cu), aluminum (Al), iron (Fe) and zinc (Zn) due to their negative effect on gold dissolution from WPCBs. The factors affecting the performance and efficiency of the iodine-iodide leaching process; such as iodine/iodide concentration, pulp density, leaching time and leaching temperature were optimized in order to maximize the gold dissolution efficiency from the WPCBs in the iodine-iodide solution. Results indicated that the vast majority (> 99%) of gold was dissolved in the solution from the WPCBs under the optimized leaching conditions. Adsorption tests were conducted on leach liquor solutions resulting from the iodine-iodide leaching using activated carbon. Nearly 98% of gold was adsorbed from the liquor solution onto the carbon under the condition optimized in this study. The results obtained revealed that gold can be successfully recovered from this secondary resources, where the percent recovery amounts to nearly 97% for gold.

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Author Biographies

Batnasan Altansukh
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Graduate School of Engineering and Resource Science, Akita University, 1-1 Tegata-Gakuen Machi, Akita, 010-8502, Japan

Kazutoshi Haga
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Graduate School of Engineering and Resource Science, Akita University, 1-1 Tegata-Gakuen Machi, Akita, 010-8502, Japan

Narankhuu Ariunbolor
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Graduate School of Engineering and Resource Science, Akita University, 1-1 Tegata-Gakuen Machi, Akita, 010-8502, Japan

Shigeru Kawamura
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Graduate School of Engineering and Resource Science, Akita University, 1-1 Tegata-Gakuen Machi, Akita, 010-8502, Japan

Atsushi Shibayama
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Graduate School of International Resource Science, Akita University, 1-1 Tegata-Gakuen Machi, Akita, 010-8502, Japan

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Published In
Vol 20 No 4, Aug 29, 2016
How to Cite
[1]
B. Altansukh, K. Haga, N. Ariunbolor, S. Kawamura, and A. Shibayama, “Leaching and Adsorption of Gold from Waste Printed Circuit Boards Using Iodine-Iodide Solution and Activated Carbon”, Eng. J., vol. 20, no. 4, pp. 29-40, Aug. 2016.
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