Recovery of Valuable Metals from Waste Printed Circuit Boards by Using Iodine-Iodide Leaching and Precipitation

  • Altansukh BatnasanEmail author
  • Kazutoshi Haga
  • Atsushi Shibayama
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


This study presents a viable approach for recovery of precious metals such as gold (Au), silver (Ag), palladium (Pd), and base metals, including copper (Cu), nickel (Ni), cobalt (Co), lead (Pb) and zinc (Zn) from waste printed circuit boards (WPCBs) via iodine-iodide leaching and precipitation. The behaviours of dissolution and precipitation of precious and base metals during iodine-iodide leaching and precipitation processes were discussed. Sodium hydroxide (NaOH) was used to remove base metal impurities exist in the pregnant leach solution under alkaline conditions. Precious metals remained in the resulting solution from NaOH precipitation were recovered by reduction using ascorbic acid (L-AA) solution. Results show that under optimum leaching conditions, almost all (> 99%) of Au was dissolved in an iodine-iodide solution when the dissolution efficiencies of other precious metals (Ag, Pd) and base metals, besides calcium (leaching of 25%) were less than 1 and 6%, respectively. The study revealed that more than 95% of Cu, Ni, Pb, Zn, Fe and Mn were initially removed from the pregnant leach solution at pH of 9.3 with addition of 0.1 M NaOH. Then 99.8% Au, 81.7% Ag and 74% Pd were precipitated from the obtained solution after NaOH precipitation while L-AA dose was 0.6 ml/ml at the condition. It can be concluded that the precious and base metals could be recovered selectively and economically from WPCBs via iodine-iodide leaching followed by precipitation using NaOH and L-AA.


Valuable metals Precious and base metals Iodine-iodide Leaching Precipitation Reduction 



The authors gratefully acknowledge the financial support from the Japan Society for the Promotion of Science (JSPS) through “New Frontier Leader Program for Rare-Metals and Resources” and grant KAKENHI-16H04182.


  1. 1.
    Abhishek KA, Gabriel IZ, Xianlai Z, Jinhui L (2017) Evaluating waste printed circuit boards recycling: opportunities and challenges, a mini review. Waste Manage Res 35(4):1–11Google Scholar
  2. 2.
    Kui H, Jie G, Zhenming X (2009) Recycling of waste printed circuit boards: a review of current technologies and treatment status in China. J Hazard Mater 164:399–408CrossRefGoogle Scholar
  3. 3.
    Ravi V (2012) Evaluating overall quality of recycling of e-waste from end-of-life computers. J Cleaner Prod 20:145–151CrossRefGoogle Scholar
  4. 4.
    Ning C, Lin CSK, Hui DCW, McKay G (2017) Waste printed circuit board (PCB) recycling techniques. Top. Curr. Chem (Z) 375(2):43. CrossRefGoogle Scholar
  5. 5.
    Kaya M (2016) Recovery of metals and nonmetals from electronic waste by physical and chemical recycling processes. Waste Manag 57:64–90CrossRefGoogle Scholar
  6. 6.
    Syed S (2012) Recovery of gold from secondary sources-A review. Hydrometallurgy 115–116:30–51CrossRefGoogle Scholar
  7. 7.
    Jirang C, Lifeng Zh (2008) Metallurgical recovery of metals from electronic waste: a review. J Hazard Mater 158:228–256CrossRefGoogle Scholar
  8. 8.
    Zhang L, Xu Z (2016) A review of current progress of recycling technologies for metals from waste electrical and electronic equipment. J Clean Prod 127:19–36CrossRefGoogle Scholar
  9. 9.
    Cayumil R, Khanna R, Rajarao R, Mukherjee PS, Sahajwalla V (2016) Concentration of precious metals during their recovery from electronic waste. Waste Manag 57:121–130CrossRefGoogle Scholar
  10. 10.
    Hilson G, Monhemius AJ (2006) Alternatives to cyanide in the gold mining industry: what prospects for the future? J Clean Prod 14:1158–1167CrossRefGoogle Scholar
  11. 11.
    Fleming CA, McMullen J, Thomas KG, Wells JA (2003) Recent advances in the development of an alternative to the cyanidation process: thiosulfate leaching and resin in pulp. Miner Metall Process 20(1):1–9Google Scholar
  12. 12.
    Aylmore MG (2005) Alternative lixiviants to cyanide for leaching gold ores. In: Adams MD (ed) Advances in gold ore processing 2005. Elsevier, Western Australia, pp 501–541CrossRefGoogle Scholar
  13. 13.
    Homick RP, Sloan H (1976) Gold reclamation process, US3957505Google Scholar
  14. 14.
    Qi PH, Hiskey JB (1993) Electrochemical behaviour of gold in iodide solutions. Hydrometallurgy 32:161–179CrossRefGoogle Scholar
  15. 15.
    Davis A, Tran T, Young DR (1993) Solution chemistry of iodide leaching of gold. Hydrometallurgy 32:143–159CrossRefGoogle Scholar
  16. 16.
    Angelidis TN, Kydros KA, Matis KA (1993) A fundamental rotating disk study of gold dissolution in iodine-iodide solutions. Hydrometallurgy 34:49–64CrossRefGoogle Scholar
  17. 17.
    Shibayama A, Tongamp V, Altansukh B, Haga K, Hosoi A (2013) Electronic waste treatment: Part 1. Autoclave oxidation-leaching using pyrite waste from mine tailing. Hydrometallurgy 137:92–100CrossRefGoogle Scholar
  18. 18.
    Altansukh B, Haga K, Ariunbolor N, Kawamura S, Shibayama A (2016) Leaching and adsorption of gold from waste printed circuit boards using iodine-iodide solution and activated carbon. Eng J 20(4):29–40CrossRefGoogle Scholar
  19. 19.
    Process ProbeTM ORP Sensors, Broadley James, (2013), Doc. Nr. P2000–2013, Accessed 8 Mar 2017
  20. 20.
    Bier AW, Hach-Lange (2009) Introduction to oxidation reduction potential measurement, Hach Company, Accessed 26 Feb 2016

Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  • Altansukh Batnasan
    • 1
    Email author
  • Kazutoshi Haga
    • 2
  • Atsushi Shibayama
    • 1
  1. 1.Graduate School of International Resource SciencesAkita UniversityAkitaJapan
  2. 2.Graduate School of Engineering ScienceAkita UniversityAkitaJapan

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