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Development of novel process to recycle precious metals and rare metals by controlling the anionic species in molten salt electrolyte

Research Project

Project/Area Number 20H02493
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
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, 講師 (50555290)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000)
Fiscal Year 2022: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2021: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥12,610,000 (Direct Cost: ¥9,700,000、Indirect Cost: ¥2,910,000)
Keywordsリサイクル / 貴金属 / レアメタル / 電気化学 / 溶融塩 / 乾式プロセス
Outline of Research at the Start

貴金属やレアメタルの需要は、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。一方で、これらの金属の天然資源は、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、使用済みの電子デバイスなどからのリサイクルプロセスが極めて重要である。しかしながら、貴金属やレアメタルのリサイクルは、一般的に、強力な酸などを用いた水溶液への溶解を基本的な手法とする、複雑な処理によって行われており、長い工程時間と多量に発生する有害廃液による環境負荷という課題がある。そこで、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の開発に取り組む。

Outline of Final Research Achievements

The objective of this study was to develop a new recycling process for precious and rare metals that shortens processing time, reduces the generation of harmful waste liquids, and simplifies separation and purification. We conducted detailed research on the electrochemical reactions of metal anions in molten salt. We analyzed the dissolution behavior of metals (M) into molten salt as metal anions (M-) from various alloys, and the electrochemical behavior of metal anions. Based on the analysis results, we discovered the conditions for the anode deposition of metal M (M- = M + e-) by electrochemical oxidation reaction and developed a new technology to selectively separate and recover Au from various Au alloys. Furthermore, we clarified the effectiveness of this method for some rare metals other than precious metals.

Academic Significance and Societal Importance of the Research Achievements

本研究では、工程時間の短縮、有害廃液の発生抑制、分離・精製の簡素化を実現する新たな貴金属・レアメタルのリサイクルプロセスを開発した。この方法では、Auなどの電気陰性度の高い金属を活性金属と合金化して金属間化合物を作り、これを溶融塩に溶解する。溶解後、電気化学的にアノード析出し、Auを選択的に分離・回収する。本研究ではスクラップ含有金属元素とAuとの合金から、Auを効率的に分離・回収可能であることを明らかにした。従来のリサイクルプロセスは多工程からなるが、この新プロセスは初期工程で貴金属やレアメタルを選択的に分離・回収することが可能となり、リサイクルプロセス全体の効率化に繋がると期待される。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (33 results)

All 2023 2022 2021 2020 Other

All Journal Article (8 results) (of which Peer Reviewed: 7 results,  Open Access: 2 results) Presentation (21 results) (of which Int'l Joint Research: 10 results,  Invited: 4 results) Book (3 results) Remarks (1 results)

  • [Journal Article] Direct Oxygen Removal from Titanium by Utilizing Vapor of Rare Earth Metals2023

    • Author(s)
      Ouchi Takanari、Akaishi Kenta、Kamimura Gen、Okabe Toru H.
    • Journal Title

      MATERIALS TRANSACTIONS

      Volume: 64 Issue: 1 Pages: 61-70

    • DOI

      10.2320/matertrans.MT-MLA2022022

    • ISSN
      1345-9678, 1347-5320
    • Year and Date
      2023-01-01
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Deoxidation of Titanium Using Cerium–Chloride Flux for Upgrade Recycling of Titanium Scraps2022

    • Author(s)
      Kamimura Gen、Ouchi Takanari、Okabe Toru H.
    • Journal Title

      MATERIALS TRANSACTIONS

      Volume: 63 Issue: 6 Pages: 893-902

    • DOI

      10.2320/matertrans.M-M2022805

    • ISSN
      1345-9678, 1347-5320
    • Year and Date
      2022-06-01
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Thermodynamic Consideration of Direct Oxygen Removal from Titanium by Utilizing Vapor of Rare Earth Metals2022

    • Author(s)
      Okabe Toru H.、Kong Lingxin、Ouchi Takanari
    • Journal Title

      Metallurgical and Materials Transactions B

      Volume: 53 Issue: 2 Pages: 1269-1282

    • DOI

      10.1007/s11663-021-02342-z

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] New Deoxidation Method of Titanium Using Metal Filter in Molten Salt2022

    • Author(s)
      Iizuka Akihiro、Ouchi Takanari、Okabe Toru H.
    • Journal Title

      Metallurgical and Materials Transactions B

      Volume: - Issue: 3 Pages: 1371-1382

    • DOI

      10.1007/s11663-021-02400-6

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Deoxidation of Titanium Using Cerium Metal and Its Oxyhalide Formation2022

    • Author(s)
      Kamimura Gen、Ouchi Takanari、Okabe Toru H.
    • Journal Title

      Proceedings of REWAS 2022: Developing Tomorrow’s Technical Cycles

      Volume: 1 Pages: 83-89

    • DOI

      10.1007/978-3-030-92563-5_10

    • ISBN
      9783030925628, 9783030925635
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 貴金属の製錬・リサイクル技術の最前線(貴金属シンポジウム)2021

    • Author(s)
      大内 隆成、岡部 徹
    • Journal Title

      Materia Japan

      Volume: 60 Issue: 12 Pages: 802-804

    • DOI

      10.2320/materia.60.802

    • NAID

      130008123048

    • ISSN
      1340-2625, 1884-5843
    • Year and Date
      2021-12-01
    • Related Report
      2021 Annual Research Report
  • [Journal Article] New Process to Recycle Precious Metals Using Electrochemical Anodic Deposition2021

    • Author(s)
      大内 隆成、岡部 徹
    • Journal Title

      Journal of the Japan Institute of Metals and Materials

      Volume: 85 Issue: 8 Pages: 316-328

    • DOI

      10.2320/jinstmet.JA202102

    • NAID

      130008067467

    • ISSN
      0021-4876, 1880-6880, 2433-7501
    • Year and Date
      2021-08-01
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Recycling of Gold Using Anodic Electrochemical Deposition from Molten Salt Electrolyte2020

    • Author(s)
      Ouchi Takanari、Wu Shuang、Okabe Toru H.
    • Journal Title

      Journal of The Electrochemical Society

      Volume: 167 Issue: 12 Pages: 123501-123501

    • DOI

      10.1149/1945-7111/aba6c5

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Anodic Electrochemical Deposition and Its Application2023

    • Author(s)
      Takanari Ouchi and Toru H. Okabe
    • Organizer
      The 16th Workshop on Reactive Metal Processing (RMW16)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Recovery of precious metals from scraps using electrochemical anodic deposition in molten salt electrolyte2023

    • Author(s)
      Yuka Kujiraoka, Takanari Ouchi and Toru H. Okabe
    • Organizer
      The 16th Workshop on Reactive Metal Processing (RMW16)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] New recycling process of precious metals using electrochemical anodic deposition2022

    • Author(s)
      Takanari Ouchi, and Toru H. Okabe
    • Organizer
      CMSC2022, UT^2-Mac Student Workshop
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Development of pre-treatment technique for concentration of platinum group metals from autocatalyst by flotation2022

    • Author(s)
      Sukho Kang, Takanari Ouchi, and Toru H. Okabe
    • Organizer
      CMSC2022, UT^2-Mac Student Workshop
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Development of a new recycling process of titanium scraps through deoxidation using cerium metal2022

    • Author(s)
      Gen Kamimura, Takanari Ouchi, and Toru H. Okabe
    • Organizer
      CMSC2022, UT^2-Mac Student Workshop
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Deoxidation of titanium using rare earth metals as deoxidation agents in molten salt electrolyte2022

    • Author(s)
      Takanari Ouchi and Toru H. Okabe
    • Organizer
      Kipouros International Symposium, SIPS2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Recycling Processes of Precious Metals and Rare Metals for Sustainable Development2022

    • Author(s)
      Takanari Ouchi
    • Organizer
      The 7th Cambridge-UTokyo Joint Symposium 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 溶融塩電気化学を用いる高効率エネルギー利用と資源循環への挑戦2022

    • Author(s)
      大内 隆成
    • Organizer
      第1回溶融塩化学オンラインサロン-Yo!You!en!cafe- (溶融塩委員会)
    • Related Report
      2022 Annual Research Report
  • [Presentation] 次世代エネルギーシステムにおける非鉄 金属製造・リサイクルプロセスの可能性2022

    • Author(s)
      大内 隆成, 岩船 由美子
    • Organizer
      持続型材料エネルギーインテグレーション研究センター設立シンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] 溶融塩中でのアノード電解析出を用いた貴金属の新規リサイクル手法2022

    • Author(s)
      大内 隆成
    • Organizer
      溶融塩委員会 第209回定例委員会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Recycling Processes of Nonferrous Metals for Sustainable Development2022

    • Author(s)
      大内 隆成
    • Organizer
      九州大学アジア・オセアニア研究教育機構シンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] 非鉄金属製錬・リサイクル技術について知ってもらいたいこと2022

    • Author(s)
      大内 隆成
    • Organizer
      第26回理科・化学教育懇談会フォーラム
    • Related Report
      2022 Annual Research Report
  • [Presentation] Anodic electrochemical deposition of gold from molten salt electrolyte2021

    • Author(s)
      Takanari Ouchi, Shuang Wu, and Toru H. Okabe
    • Organizer
      30th Topical Meeting of the International Society of Electrochemistry
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Recycling of Rare Metals2021

    • Author(s)
      Toru H. Okabe, and Takanari Ouchi
    • Organizer
      20th Science Council of Asia Conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Deoxidation of Titanium Using Cerium Metal and Its Oxyhalide Formation2021

    • Author(s)
      Gen Kamimura, Takanari Ouchi, and Toru H. Okabe
    • Organizer
      TMS 2022 Annual Meeting & Exhibition (TMS2022)
    • Related Report
      2021 Annual Research Report
  • [Presentation] 希土類金属の脱酸能を利用するチタンの新規気相脱酸技術の開発2021

    • Author(s)
      赤石 謙太, 大内 隆成, 岡部 徹
    • Organizer
      資源・素材学会 関東支部 第18回「資源・素材・環境」技術と研究の交流会
    • Related Report
      2021 Annual Research Report
  • [Presentation] アノード電析法を用いたAu含有合金からのAuの選択抽出プロセスの開発2021

    • Author(s)
      平松 大武, 大内 隆成, 岡部 徹
    • Organizer
      資源・素材学会 関東支部 第18回「資源・素材・環境」技術と研究の交流会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Selective Extraction of Gold from Gold-copper Alloy Using Anodic Electrochemical Deposition in Molten Salt Electrolyte2021

    • Author(s)
      T. Ouchi, S. Wu, T. Okabe
    • Organizer
      TMS 2021 Virtual Annual Meeting & Exhibition (TMS2021 Virtual)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 貴金属のアノード電析2020

    • Author(s)
      大内 隆成
    • Organizer
      貴金属の製錬・リサイクル技術の最前線シンポジウム (第94回レアメタル研究会)
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] アノード電析法を用いた新規貴金属リサイクル手法の開発2020

    • Author(s)
      大内 隆成, Shuang wu, 岡部 徹
    • Organizer
      資源・素材2020 (仙台) -2020年度 資源・素材関係学協会合同秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 化学冶金プロセス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
      駒場材料学セミナー若手講演会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Book] Rare Metal Technology 20232023

    • Author(s)
      Takanari Ouchi, Kerstin Forsberg, Gisele Azimi, Shafiq Alam, Neale R. Neelameggham, Hojong Kim, Alafara Abdullahi Baba, Hong Peng, Athanasios Karamalidis
    • Total Pages
      301
    • Publisher
      Springer
    • ISBN
      9783031227615
    • Related Report
      2022 Annual Research Report
  • [Book] Rare Metal Technology 20222022

    • Author(s)
      Takanari Ouchi, Gisele Azimi, Kerstin Forsberg, Hojong Kim, Shafiq Alam, Neale R. Neelameggham, Alafara Abdullahi Baba, Hong Peng
    • Total Pages
      353
    • Publisher
      Springer
    • ISBN
      9783030926618
    • Related Report
      2021 Annual Research Report
  • [Book] Rare Metal Technology 20212021

    • Author(s)
      Gisele Azimi, Takanari Ouchi, Kerstin Forsberg, Hojong Kim, Shafiq Alam, Alafara Abdullahi Baba, Neale R. Neelameggham
    • Total Pages
      362
    • Publisher
      Springer
    • ISBN
      9783030654887
    • Related Report
      2020 Annual Research Report
  • [Remarks] 研究室ホームページ

    • URL

      https://www.ouchi.iis.u-tokyo.ac.jp/

    • Related Report
      2022 Annual Research Report

URL: 

Published: 2020-04-28   Modified: 2024-01-30  

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