Simultaneous partition experiment of divalent metal ions between sphalerite and 1 mol/l (Ni, mg, co, fe, mn)cl2 aqueous solution under supercritical conditions

Etsuo Uchida, Keiko Wakamatsu, Naoki Takamatsu

Research output: Contribution to journalArticlepeer-review

Abstract

A simultaneous partition experiment of divalent metal ions was performed between sphalerite and 1 mol/L (Ni, Mg, Co, Fe, Mn)Cl2 aqueous solution under supercritical hydrothermal conditions of 500–800C and 100 MPa. The bulk partition coefficient that was defined by KPB(ZnS) = (xMeS/xZnS)/(mMeaq/mZnaq) followed the order of Zn ≑ Co ≑ Ni > Fe > Mn > Mg at all temperatures. In the partition coefficient versus ionic radius (PC–IR) diagrams with the logarithmic value of the bulk partition coefficient (log KPB(ZnS)) on the vertical axis, and the ionic radius of the six-fold coordinated site on the horizontal axis, Ni shows a positive partition anomaly, and the other elements were almost on the PC–IR curve. Based on the PC–IR curve, the optimum ionic radius for sphalerite existed where the ionic radius was slightly larger than Zn (~0.76 Å). A Ni positive partition anomaly may result from its large electronegativity.

Original languageEnglish
Article number435
JournalMinerals
Volume11
Issue number4
DOIs
Publication statusPublished - 2021 Apr

Keywords

  • Aqueous chloride solution
  • Divalent cation
  • Partition coefficient
  • Sphalerite
  • Supercriti-cal condition

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geology

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