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Lithium isotope selectivities of lithium-specific adsorbents

Research Project

Project/Area Number 05808044
Research Category

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

Allocation TypeSingle-year Grants
Research Field エネルギー学一般・原子力学
Research InstitutionSophia University

Principal Investigator

OI Takao  Sophia Univ., Fac.Sci.Technol., associate prof., 理工学部, 助教授 (90168849)

Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1994: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1993: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsLithium / Lithium isotopes / Isotope effects / Isotope separation / Inorganic adsorbents / Lithium-specific adsorbents / Manganese oxides / Antimonic acid / 分離係数 / イオン選択性 / 吸着剤 / 同位体分離係数 / 吸着量
Research Abstract

Three lithium specific adsorbents have been prepared and their lithium isotope selectivity has been investigated. They were a manganese oxide-based adsorbent designated as MnO_2(Li) prepared by extracting lithium ions from the precursor, LiMn_2O_4, another manganese oxide-based adsorbent, HMnO(2Mg) prepared by extracting magnesium ions from Mg_2MnO_2 and antimonic acid, HSbO_3, with the monoclinic structure prepared by extracting lithium ions from LiSbO_3. Ammonium peroxodisulfate was found to be an excellent extractant of lithium and magnesium ions in the preparation of MnO_2(Li) and HMnO(2Mg). Isotopically, the three adsorbents examined were all ^6Li specific. The magnitude of the lithium isotope effect of MnO_2(Li) slightly decreased with the increase in the degree of manganese dissolution in the process of lithium extraction from the precursor and also decreased with the increase in the lithium/manganese molar ratio in the precursor between Li/Mn=0.5 and 0.8. The maximum separation factor for the lithium isotopes with MnO_2(Li) was 1.014 at 25゚C.Various properties of HMnO(2Mg) depended on the degree of magnesium extraction in the process of its preparation. With the increase in the degree of magnesium extraction, the lithium uptake increased, selectivity for the lithium ions increased, but unfortunately the separation factor value decreased. HSbO_3 showed the largest lithium isotope effect among the three adsorbents examined while the amount of lithium uptake was comparable to those of the other two adsorbents. The maximum separation factor value of HSbO_3 was 1.025 at 25゚C.However, it was very difficult to extract lithium ions adsorbed in HSbO3, which seemed a serious drawback of HSbO_3 as a lithium isotope separator.

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] H.Ogino and T.Oi: "Extraction of lithium from LiMnO_4 by ammonium peroxodisultate and lithium isotope selectivities of adsorbents thus obtainod" Sep.Sci.Technol.(in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Oi: "Lithium isotope selectivity of antimonic acids" Proc.Int'l.Conf.Ion Exchange'95. 147-152 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Ogino and T.Oi: ""Extraction of lithium from LiMn_2O_4 by ammonium peroxodisulfate and lithium isotope selectivities of adsorbents thus obtained" Sep.Sci.Technol.147-152 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Oi: ""Lithium isotope selectivity of antimonic acids"" Proc.Int'l.Conf.Ion Exchange '95.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Ogino and T.Oi: "Extraction of lithium from LiMn_2O_4 by ammonium peroxodisulfate and lithium isotope selectivities of adsorbents thus obtained" Sep.Sci.Technol.

    • Related Report
      1994 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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