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One-pot recovery of gallium from used LEDs

Research Project

Project/Area Number 18K11715
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 64030:Environmental materials and recycle technology-related
Research InstitutionShibaura Institute of Technology

Principal Investigator

KIYONO HAJIME  芝浦工業大学, 工学部, 教授 (50281788)

Project Period (FY) 2018-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywordsガリウム / リサイクル / 発光ダイオード / 高温 / 還元 / 気化 / 乾式 / ワンポット
Outline of Final Research Achievements

Ga recovery from chip LEDs was attempted. Experiments were conducted using a high-temperature reduction-vaporization-oxidation deposition reaction with Ga2O3 powder and commercially available chip LEDs, showing that Ga2O3 is reduced and vaporized at around 1150°C when mixed with graphite powder and at around 950°C in a mixture of PC and PET. The use of quartz glass test tube containers suggests that the material can be easily recovered with little leakage out of the test tube. In an experiment using chip LEDs, it was found necessary to separate the metal from the light-emitting element and electrode, and this was accomplished by heating at 500°C and shaking. After that, Ga2O3 was recovered when heated in the container studied in this study.

Academic Significance and Societal Importance of the Research Achievements

窒化ガリウム(GaN)を含む白色LEDの普及によりLED照明は急速に増加し,LEDの廃棄物も増えている.ガリウムはレアメタルであり,資源確保が課題となっている.日本では特にGa消費が多く,LED廃棄物からのGa回収が必要とされている.真空冶金や溶媒抽出などの方法が報告されているが,装置の複雑さや廃液処理の問題がある.そこで,我々は高温での還元気化-酸化析出を検討し,ガリウムを回収することができた.LEDに含まれている電極の金族を分離する必要性がみられ当初目標とした簡単な手法からは少し離れてしまったが,比較的簡単なリサイクルの一手法を示すことができた.

Report

(6 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (5 results)

All 2022 2020 2019

All Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results) Presentation (4 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Synthesis of GaN nano-particles by NH3 nitridation of mixed β-Ga2O3 and GaN powders2020

    • Author(s)
      Hajime KIYONO, Yasuyuki MATSUO, Takuto MISE, Kohei KOBAYASHI, Hanan ALHUSSAIN
    • Journal Title

      Journal of the Ceramic Society of Japan

      Volume: -

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] β-Ga2O3 の樹脂による還元-気化の促進効果2022

    • Author(s)
      春日井若菜,藤井 匠,杉森晃祐,人見耕平,清野 肇
    • Organizer
      日本セラミックス協会関東支部 第38回関東支部研究発表会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 還元気化―酸化析出プロセスによるGa回収法のためのチッブLEDの熱分解挙動の謂査2020

    • Author(s)
      小林浩平,日野拓真,久保木有香,清野肇,明石孝也
    • Organizer
      資源・素材学会2020年度春季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] INVESTIGATION OF THERMAL DECOMPOSITION BEHAVIOR OF LED AND THE EFFECT OF COMPOUNDS ON GALLIUM RECOVERY USING REDUCTION VAPORIZATION-OXIDATION DEPOSITION2020

    • Author(s)
      Kohei Kobayashi, Yuka Kuboki, Takaya Akashi, Hajime Kiyono
    • Organizer
      14th SOUTH EAST ASLAN TECHNICAL UNIVERSITY CONSORTIUM SYMPOSlUM (SEATUC 2020)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 還元気化ー酸化析出を利用したGa回収における樹脂の影響とLEDの熱分解挙動の調査2019

    • Author(s)
      小林浩平,日野拓真,石鍋翼,久保木有香,清野肇,明石孝也
    • Organizer
      資源・素材2019(京都)
    • Related Report
      2019 Research-status Report

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Published: 2018-04-23   Modified: 2024-01-30  

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