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Development of novel process to recycle precious metals using molten salt electrolysis

Research Project

Project/Area Number 18K14037
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 26060:Metals production and resources production-related
Research InstitutionThe University of Tokyo

Principal Investigator

Ouchi Takanari  東京大学, 生産技術研究所, 助教 (50555290)

Project Period (FY) 2018-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords貴金属 / リサイクル / 乾式プロセス / 溶融塩 / 電気化学 / 白金族金属
Outline of Final Research Achievements

Development of recycling process of precious metals from scraps is crucial for sustainable society. Precious metals are chemically stable, and strong chemical agents are required to dissolve them in an aqueous solution in conventional recycling processes. Furthermore, scraps contain many elements, and their separation/recovery requires multiple complicated steps and generates large amounts of hazardous liquid waste. In this study, a new process to dissolve precious metals from scraps in molten salt and to selectively recover precious metals in the molten salt electrolyte utilizing electrochemical deposition was developed. This novel recycling process is simple and does not generate harmful wastes, and is valid for separation and recovery of precious metals from waste scraps.

Academic Significance and Societal Importance of the Research Achievements

貴金属の需要は、我々の生活水準の向上、クリーンテクノロジーの導入に伴い、益々増加すると予想される。一方で、これらの貴金属の天然資源は、南アフリカやロシアなど限られた地域に偏在しており、我が国の安定的な資源供給のためには、使用済みの電子機器や自動車排ガス触媒からのリサイクルプロセスが極めて重要である。本研究では、簡便で有害廃液の発生のない、効率性と環境調和性を兼備した新規リサイクルプロセスを開発した。本研究で開発したプロセスが実用化されることで、貴金属のリサイクルがさらに促進することが期待される。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • Research Products

    (5 results)

All 2020 2019 2018

All Presentation (5 results) (of which Int'l Joint Research: 2 results,  Invited: 3 results)

  • [Presentation] 電気化学を用いた高効率エネルギー利用と資源循環への挑戦2020

    • Author(s)
      大内隆成
    • Organizer
      日本実験力学会 マテリアル反応工学分科会 主催 日本鉄鋼協会 環境・エネルギー・社会工学部会 グリーンエネルギーフォーラム 共催 2019 年度第1回講演会「持続可能な社会を目指した材料設計・プロセスの新展開」
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Development of a New Electrodeposition Process based on Liquid Metal Electrochemical Technologies in Molten Salt Electrolytes2020

    • Author(s)
      Takanari Ouchi, Shuang Wu, and Toru H. Okabe
    • Organizer
      TMS2020, 149th Annual Meeting and Exhibition
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Electrodeposition of Gold in Molten Mixture of Sodium Chloride and Sodium Iodide2019

    • Author(s)
      Shuang Wu, Takanari Ouchi, Toru H. Okabe
    • Organizer
      資源・素材学会 関東支部 第16回「資源・素材・環境」技術と研究の交流会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Fundamental Consideration of Electroplating of Precious Metals using Molten Salt Electrolyte2019

    • Author(s)
      Shuang Wu, Takanari Ouchi, Toru. H. Okabe
    • Organizer
      The 14th Workshop on Reactive Metal Processing (RMW14)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 電気化学プロセスと資源循環2018

    • Author(s)
      大内 隆成
    • Organizer
      2018 年度[早大] 大和田・所・山口研×[東大] 岡部・八木研合同ゼミ合宿講演会 「これからの資源循環を考える」
    • Related Report
      2018 Research-status Report
    • Invited

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Published: 2018-04-23   Modified: 2021-02-19  

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