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A study of minerals adsorbing rare earth elements in ion adsorption type ore

Research Project

Project/Area Number 18K13623
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 17030:Human geosciences-related
Research InstitutionUniversity of Tsukuba (2019-2020)
National Institute of Advanced Industrial Science and Technology (2018)

Principal Investigator

MUKAI Hiroki  筑波大学, 生命環境系, 助教 (80817289)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
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)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsレアアース / イオン吸着型鉱床 / 電子顕微鏡 / LA-ICP-MS / Nano-SIMS / 粘土鉱物 / ICP-MS / FIB-TEM / イオン吸着型レアアース鉱床 / 電界放出型電子線マイクロアナライザ / 集束イオンビーム/透過型電子顕微鏡法
Outline of Final Research Achievements

In this study, an ion-adsorption rare earth ore of China was analyzed, and adsorption and desorption experiments of rare earth elements were conducted. The analyses of the ore showed that the kaolinitic particles composed of kaolinite, hematite and illite have a high concentrations of rare earth elements. Further, it was clarified that rare earth elements were particularly concentrated in illite in the kaolinitic particles. In the desorption experiments using an electrolyte solution, it was suggested that rare earth elements partially formed an inner-sphere complex on the kaolinitic particles.

Academic Significance and Societal Importance of the Research Achievements

これまでイオン吸着型鉱床において、レアアースはカオリナイトやハロイサイトといった粘土鉱物に吸着されていると推定されてきたが、鉱床においてレアアースの濃度は比較的低いため、実際にはどのような鉱物に吸着されているのかよくわかっていなかった。本研究において電子顕微鏡の他、レーザーアブレーションICP質量分析(LA-ICP-MS)法および高解像度高感度二次イオン質量分析(Nano-SIMS)等の多様な手法を用いることによって、鉱石中のレアアースがイライトによく濃集していることをはじめて直接的に観察することができた。この結果は鉱床の形成過程についての理解や今後の鉱床の探査にも資するものと考えられる。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (5 results)

All 2020 2019 2018

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (4 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Microscopic analyses of weathered granite in ion-adsorption rare earth deposit of Jianxi Province, China2020

    • Author(s)
      Mukai Hiroki、Kon Yoshiaki、Sanematsu Kenzo、Takahashi Yoshio、Ito Motoo
    • Journal Title

      Scientific Reports

      Volume: 10 Issue: 1 Pages: 20194-20194

    • DOI

      10.1038/s41598-020-76981-8

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Microscopic study on rare earth elements in ion-adsorption type ore of China2019

    • Author(s)
      Hiroki Mukai, Yoshiaki Kon, Kenzo Sanematsu, Yoshio Takahashi, Motoo Ito
    • Organizer
      日本地球惑星科学連合2019年大会
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Microscopic analyses of weathered granite soil in ion adsorption rare earth ore of China2019

    • Author(s)
      Hiroki Mukai, Yoshiaki Kon, Kenzo Sanematsu, Yoshio Takahashi, Motoo Ito
    • Organizer
      Goldschimdt 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] イオン吸着型鉱床におけるレアアース吸着鉱物についての研究2018

    • Author(s)
      向井広樹,昆慶明,実松健造
    • Organizer
      日本地球惑星科学連合2018年大会
    • Related Report
      2018 Research-status Report
  • [Presentation] イオン吸着型鉱床における 希土類元素吸着鉱物についての顕微解析2018

    • Author(s)
      向井広樹,昆慶明,実松健造
    • Organizer
      日本鉱物科学会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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