Study on dissolution of precious group metals using dilute hydrochloric acid

2015 Fiscal Year Final Research Report

• Project/Area Number: 24656553
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Recycling engineering
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Koyanaka Shigeki 国立研究開発法人産業技術総合研究所, 環境管理研究部門, 研究グループ長 (60357035)
• Co-Investigator(Renkei-kenkyūsha): SHIBATA JUNJI 関西大学, 環境都市工学部, 教授 (70067742)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: リサイクル / 貴金属 / 溶解 / 希塩酸 / 二酸化マンガン / 塩素

Outline of Final Research Achievements

The aim of this research is to develop safe dissolution method for precious group metals under relatively moderate condition without using poisonous substance. We had discovered that gold metal is dissolved into dilute hydrochloric acid under the coexistence of manganese oxide powder. In this research, fundamental property of this phenomena was discussed then Au dissolution from printed circuit boards was applied.
As the results, it was confirmed that Au and Pd were dissolved under 0.5mol/dm3 hydrochloric acid with MnO2 powder. On the other hand, this technique could not be applied for Pt dissolution and precious metals in printed circuit boards.

Free Research Field

資源リサイクリング工学