Experiments on the simultaneous partitioning of divalent metal ions between spinel group minerals (spinel and magnetite) and 2M aqueous chloride solutions under supercritical conditions

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  • UCHIDA Etsuo
    Department of Resources and Environmental Engineering, Waseda University
  • TAKAHASHI Chiyoko
    Department of Resources and Environmental Engineering, Waseda University
  • OHTA Norimasa
    Department of Resources and Environmental Engineering, Waseda University

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Other Title
  • 超臨界条件下におけるスピネル族鉱物（スピネル，磁鉄鉱）と２Ｍ塩化物水溶液間における２価金属イオンの同時分配実験
  • チョウリンカイ ジョウケン カ ニ オケル スピネルゾク コウブツ スピネル ジテッコウ ト 2M エンカブツ スイヨウエキ カン ニ オケル 2カ キンゾク イオン ノ ドウジ ブンパイ ジッケン

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Abstract

The partitioning of Mg2+, Mn2+, Fe2+, Co2+, Ni2+ and Zn2+ between spinel group minerals (spinel and magnetite) and 2M aqueous chloride solutions was experimentally investigated in the temperature range of 500 to 800°C, 1 kb. The experimental results were analyzed thermodynamically taking into consideration the aqueous speciation.<BR>The partition coefficient - ionic radius (PC-IR) diagrams are drawn based on the experimental results. PC-IR curve for magnetite is parabola-shaped with a maximum between Co2+ and Fe2+, whereas Ni2+ and Zn2+ deviate from such a trend. The anomaly of Zn2+ and Ni2+ may be attributable to their tetrahedral and octahedral site preferency, respectively. The PC-IR curve becomes gentle with increasing temperature. This means that the element partitioning becomes weak with increasing temperature. On the other hand, PC-IR curve for spinel shows a maximum between Ni2+ and Mg2+, but Zn2+ shows no anomaly unlike the case of magnetite. This is because the element partitioning occurs in the tetrahedral site in the case of spinel.

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