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Research on Physicochemical Properties of Electrolytes for Electrowinning of Rare-Earth Metals

Research Project

Project/Area Number 02650472
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 金属精錬・金属化学
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

SATO Yuzuru  Tohoku Univ.,Engineering, Assoc.Prof., 工学部, 助教授 (80108464)

Co-Investigator(Kenkyū-buntansha) ENDO Mamoru  Tohoku Univ.,Engineering, Research Assoc., 工学部, 助手 (30213599)
ZHU Hongmin  Tohoku Univ.,Engineering, Research Assoc., 工学部, 助手 (40216148)
YAMAMURA Tsutomu  Tohoku Univ.,Engineering, Assoc.Prof., 工学部, 助教授 (80005363)
江島 辰彦  東北大学, 工学部, 教授 (80005206)
Project Period (FY) 1990 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1992: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1991: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1990: ¥1,600,000 (Direct Cost: ¥1,600,000)
KeywordsRare Earth Metal / Rare Earth Chloride / Molten Salt / Alkali Chloride / Complex Ion / Molar Volume / Electrical Conductivity / Viscosity / 物理化学的性質 / モル体積
Research Abstract

Recently, the rare earth elements have become indispensable industrially in the fields of magnetic, electronic and optical materials etc. Although they are used as the metals, oxides and other compounds, production of the metals is interested in this project. As rare earth metals are very active chemically, main method of the production is molten salt electrolysis.
In this project, the physicochemical properties, for example, molar volume, electrical conductivity, viscosity, surface tension and electrode behavior etc,, of the molten salt containning rare earth compounds are investigated. The molten salts used are chlorides. Rare earth chlorides used are LaCl_3, CeCl_3 and SmCl_3. Density, electrical conductivity and viscosity of rare earth chlorides-alkali chloride binary melts were measured. Molar volumes calculated from the density of the binary melts show positive deviation from an additivity. Molar electrical conductivity decreases by mixing the salts. These tendency becomes strong as the radius of alkali cation becomes large. On the other hand, the behaviors are independent of the kind of rare earth ion.
These phenomena indicate that complex ions are formed in the mixture melt. It is considered that the rare earth ions with +3 of valent make strong coulombic field, then combine with Cl^- ion and form LnCl_4^- and LnCl_6^<3-> complex anion(Ln is lanthanide).
Other than mentioned above, electrode behaviors of Ln^<3+> and the reduction of Nd_2O_3 in molten salt have investigated in this project.

Report

(4 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • 1990 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 佐藤 讓: "溶融LaCl_3-MCl(M=Li,Na,KおよびCs)2成分系の密度" 日本金属学会誌. 51. 630-636 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Yuzuru SATO: "Surface Tensions of Molten Alkali-Metal Halides" Journal of Physical Chemistry. 94. 1991-1996 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 佐藤 讓: "アルカリハライド融体の物理化学的性質" 資源・素材学会誌. 108. 791-796 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Yuzuru SATO: "Volumetic Behavior of Rare Earth Chloride-Alkali Chloride Binary Melts." Metallurgical Review of MMIJ. 9. 84-95 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Yuzuru Sato: "Densities of LaCl_3-MCl(M : Li,Na,K and Cs)Binary Melts." J.Japan Inst.Metals. Vol.51. 630-636 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Yuzuru Sato: "Surface Tensions of Molten Alkali-Metal Halides." J.Phys.Chem.Vol.94. 1991-1996 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Yuzuru Sato: "Physicochemical Properties of Alkali Halide Melts." J.Min.Materials Proc.Inst Japan. Vol.108. 791-796 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Yuzuru Sato: "Volumetric Behavior of Rare Earth Chloride-Alkali Chloride Binary Melts." Metallurgical Review of MMIJ,. Vol.9. 84-95 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 佐藤 譲: "溶融LaCl_3ーMCl(M=Li,Na,KおよびCs)2成分系の密度" 日本金属学会誌. 51. 630-636 (1987)

    • Related Report
      1992 Annual Research Report
  • [Publications] 佐藤 譲: "希土類塩化物ーアルカリ塩化物混合融体の体積挙動" 平成3年度 資源・素材関係学協会合同秋期大会 分料研究会資料. [T]. 1-4 (1991)

    • Related Report
      1992 Annual Research Report
  • [Publications] Yuzuru SATO: "Volumetric Behavior of Rare Earth ChlorideーAlkali Chlorid Binary Melts." Metallurgical Review of MMIJ. 9. 84-95 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 佐藤 譲: "溶融LaCl_3ーMCl(M:Li,Na,KおよびCs)2成分系の密度" 日本金属学会誌. 51. 630-636 (1987)

    • Related Report
      1991 Annual Research Report
  • [Publications] 佐藤 譲: "希土類塩化物ーアルカリ塩化物混合融体の体積挙動" 資源・素材関係学協会分科研究会資料〔T〕. 1-4 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 佐藤 讓: "溶融LaCl_3ーMCl(M:Li,Na,KおよびCs)2成分系の密度" 日本金属学会誌. 51. 630-636 (1987)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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