Experiments on the simultaneous partitioning of divalent metal ions between sphalerite or garnet and 2M aqueous chloride solutions under supercritical conditions

Experiments on the simultaneous partitioning of divalent metal ions were performed in the systems (1) ZnS (sphalerite)-(Ni²⁺, Co²⁺, Fe²⁺, Mn²⁺, Cd²⁺)C1₂-H₂O and (2) Mn₃Al₂Si₃O₁₂ (spessartine)-(Ni²⁺, Mg²⁺, Co²⁺, Zn²⁺, Fe²⁺, Ca²⁺)C1₂-H₂O in the temperature range of 500 to 800°C at 1 kb. In the former system for ion partitioning in the 4-fold coordination, parabola-shaped PC-IR curves with a peak near Zn²⁺ were obtained and no anomaly was observed for Zn²⁺ and Ni²⁺ but Cd²⁺. In the latter system for ion partitioning in the 8-fold coordination, parabola-shaped PC-IR curves with a peak near Mn²⁺ were obtained, but Zn²⁺ deviates from such a trend and tends to concentrate into aqueous chloride solutions. The PC-IR curves for spessartine are gentle compared with those for sphalerite. The PC-IR curves both for spessartine and sphalerite become gentle with increasing temperature.