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Investigation of dissolution characteristics and microstructure control of copper alloy anodes for electrorefining to promote copper recycling

Research Project

Project/Area Number 19K05110
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 26060:Metals production and resources production-related
Research InstitutionEhime University

Principal Investigator

Sasaki Hideaki  愛媛大学, 理工学研究科(工学系), 准教授 (10581746)

Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsリサイクル / 状態図 / 電解精錬 / 電解製錬
Outline of Research at the Start

銅や貴金属をリサイクルするために,よりエネルギー消費の少ない精錬プロセスが求められている.しかし,既存の銅の電解精錬においては銅アノードに含まれる不溶性の元素が銅の溶解を阻害することが知られるため,多様な銅の原料に対応可能な新しい電解精錬技術が求められている.本研究では,電解精錬技術の改良する上で基礎となる電極反応について知見を得るために,不純物を含んだ銅アノードの溶解反応を調査し,アノード表面におけるスライム発生および硫酸銅析出の機構を明らかにする.

Outline of Final Research Achievements

Focusing on copper (Cu)-silver (Ag)-antimony (Sb) ternary alloys, which are difficult to apply electrorefining, high-temperature equilibrium phases were investigated by microscopy and X-ray diffraction to understand their solidification structures. In order to understand the dissolution and passivation processes of heterogeneous copper alloy anodes, electrodes fabricated by connecting alloys with different compositions in parallel were observed under a microscope while convective voltammetry was performed. On the non-uniform alloy surface, the concentration of the current in the easily soluble regions caused the deposition of copper sulfate to progress sequentially, leading to passivation.

Academic Significance and Societal Importance of the Research Achievements

電気自動車や電気電子機器には銅をはじめとした非鉄金属が使用されており,資源を確保するためのリサイクルが重要となる.しかし,リサイクル原料は鉱石と異なる組成を有するため,既存の製錬技術をそのまま用いることはできない.とくに電気電子機器に含まれる Ag および Sb は銅の電解精製を妨げることが知られる.本研究では製錬過程におけるこれら不純物元素の挙動を明らかにするために,Ag および Sb を高濃度に含んだ銅合金の凝固組織を理解するとともに,不均一な組織を有するアノードの不動態化過程を観察し,リサイクルプロセスを開発するための基礎的な知見を得た.

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (5 results)

All 2022 2020

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (2 results)

  • [Journal Article] Effects of Ag on phase transformation of Cu3Sb at high temperatures2022

    • Author(s)
      Yabune Ryota、Shimizu Shunya、Fujioka Masaharu、Sasaki Hideaki
    • Journal Title

      Journal of Physics and Chemistry of Solids

      Volume: 169 Pages: 110864-110864

    • DOI

      10.1016/j.jpcs.2022.110864

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Challenges for development of technology for prevention of anode passivation during electrorefining of low-grade copper2020

    • Author(s)
      佐々木 秀顕, 岡部 徹
    • Journal Title

      Journal of MMIJ

      Volume: 136 Issue: 7 Pages: 77-87

    • DOI

      10.2473/journalofmmij.136.77

    • NAID

      130007882577

    • ISSN
      1881-6118, 1884-0450
    • Year and Date
      2020-07-31
    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Electrorefining of copper and anode passivation2020

    • Author(s)
      佐々木 秀顕,二宮 裕磨,岡部 徹
    • Journal Title

      Journal of MMIJ

      Volume: 136 Issue: 3 Pages: 14-24

    • DOI

      10.2473/journalofmmij.136.14

    • NAID

      130007823150

    • ISSN
      1881-6118, 1884-0450
    • Year and Date
      2020-03-31
    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 高温XRDを用いたCu-Sb-Ag合金の高温相の観察2022

    • Author(s)
      籔根涼太、佐々木秀顕
    • Organizer
      資源・素材2022(福岡)
    • Related Report
      2022 Annual Research Report
  • [Presentation] 銀およびアンチモンを含有した銅アノードの組織制御2020

    • Author(s)
      清水駿也,藪根涼太,佐々木秀顕
    • Organizer
      資源・素材学会 秋季講演大会
    • Related Report
      2020 Research-status Report

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Published: 2019-04-18   Modified: 2024-01-30  

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