Simultaneous partitioning of divalent metal ions between alabandite and 1 mol/l (Ni, Mg, Co, Zn, Fe)Cl2 aqueous solutions under supercritical conditions

Etsuo Uchida, Motoki Murasugi, Shuichi Okuda

Research output: Contribution to journalArticle

Abstract

To clarify the element partitioning behavior between minerals and aqueous chloride solutions, we conducted experiments to investigate simultaneous partitioning of Ni2+, Mg2+, Co2+, Zn2+, Fe2+, and Mn2+ions between alabandite (MnS) and 1 mol/L (Ni, Mg, Co, Zn, Fe)Cl2 aqueous solutions at 500–800C and 100 MPa. The bulk partition coefficients calculated using the following equation were in the order of Fe2+ > Co2+ > Ni2+ ≈ Zn2+ > Mn2+ >> Mg2+; KPN = (xMeS/mMeaq)/(xMnS/mMnaq). A partition coefficient-ionic radius (PC-IR) curve was plotted with the logarithmic value of the partition coefficient on the y-axis and the ionic radius at the six-fold coordinated site on the x-axis. The peak of this curve was located near the ionic radius of Fe2+ and not near the ionic radius of Mn2+. Zn2+ showed a slight negative partitioning anomaly, which increased in the order of sulfide minerals < arsenic sulfide minerals < arsenide minerals as the covalent bond became stronger. Ni2+ showed a positive partitioning anomaly, which indicated that it preferred an octahedral structure. The width of the PC-IR curve decreased in the order of sulfide minerals > arsenic sulfide minerals > arsenide minerals as the covalent bond became stronger, that is, the ion selectivity became stronger.

Original languageEnglish
Article number696
Pages (from-to)1-11
Number of pages11
JournalMinerals
Volume10
Issue number8
DOIs
Publication statusPublished - 2020 Aug

Keywords

  • Alabandite
  • Aqueous chloride solution
  • Divalent cation
  • Partitioning
  • Supercritical condition

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geology

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