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Challenge to novel copper electrolysis process of super power saving type using resources circulation type recycling materials

Research Project

Project/Area Number 21K18829
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 26:Materials engineering and related fields
Research InstitutionKyushu University

Principal Investigator

Nakano Hiroaki  九州大学, 工学研究院, 教授 (70325504)

Co-Investigator(Kenkyū-buntansha) 谷ノ内 勇樹  九州大学, 工学研究院, 准教授 (40644521)
大上 悟  九州大学, 工学研究院, 助教 (90264085)
Project Period (FY) 2021-07-09 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2022: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2021: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Keywords不動態 / スライム / 銅 / アノード / 電解 / 不純物 / 添加剤 / 拡散係数 / 銅アノード / 可視化 / トレーサー粒子 / In-situ / PIV / 電解液 / 流速 / リサイクル / 省電力 / 銅電解
Outline of Research at the Start

初年度にリサイクル銅アノードの不動態化挙動を自作の電解装置を用いてIn-situ解析し,更に電解液の流動を可視化できる装置を自作し粒子イメージ流速計測法(PIV)により流動を解析し,また,スライムの断面解析ができる手法を探索することにより,固-液両面からのアプローチにより不動態化のメカニズムを解明する。次年度に不動態化のメカニズムに基づき,不動態化を抑制するための電解条件およびアノードの構造を探索する。

Outline of Final Research Achievements

The effect of impurities and additives in solution on the passivation of Cu anode with purity of 78.7 mass% was clarified. The passivation was significantly easy to occur with an addition of 0.596 mol・dm-3 of Ni2+ ions, and was easy to occur with the addition of As5+ and Bi3+ ions. With an addition of Ni2+ ions, the viscosity of solution increased and the diffusion coefficient of Cu2+ ions decreased. As5+ and Bi3+ ions formed the compounds of As-Sb-O and As-Bi-O system in the slime, resulting in increase in compactness of slime. The passivation was significantly promoted with an addition of Cl- ions above 1.13 mmol・dm-3. Cl- ions formed the CuCl at the upper area of slime and increased the compactness of slime, resulting in promotion of passivation.

Academic Significance and Societal Importance of the Research Achievements

電力コストを低減させる観点から,低品位な粗Cuについても電解精製の適応が望まれている。アノードに低品位Cuを用いる電解精製を実現するためには,アノードの不動態化と電解条件の関係を把握することが必須である。その一環として,低品位Cuアノードの不動態化に及ぼす電解液中の不純物イオン,添加剤の影響を明らかにすることができた。また,電解装置を自作して,アノード,カソードの電解液の流れおよび不動態化時のCuSO4膜の形成挙動の可視化に成功した。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (2 results)

All 2023 2022

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

  • [Journal Article] Effect of Impurity Ions and Additives in Solution of Copper Electrorefining on the Passivation Behavior of Low-Grade Copper Anode2023

    • Author(s)
      Kohei Mori, Yuta Yamakawa, Satoshi Oue, Yu-ki Taninouchi and Hiroaki Nakano
    • Journal Title

      MATERIALS TRANSACTIONS

      Volume: 64 Issue: 1 Pages: 242-251

    • DOI

      10.2320/matertrans.MT-M2022087

    • ISSN
      1345-9678, 1347-5320
    • Year and Date
      2023-01-01
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effect of Impurity Ions and Additives in Solution of Copper Electrorefining on the Passivation Behavior of Low-Grade Copper Anode2022

    • Author(s)
      森康平,山川裕太,大上悟,谷ノ内勇樹,中野博昭
    • Journal Title

      Journal of the Japan Institute of Metals and Materials

      Volume: 86 Issue: 6 Pages: 97-106

    • DOI

      10.2320/jinstmet.J2022001

    • ISSN
      0021-4876, 1880-6880, 2433-7501
    • Year and Date
      2022-06-01
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access

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Published: 2021-07-13   Modified: 2024-01-30  

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