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 500–800 °C and 100 MPa. The bulk partition coefficients calculated using the following equation were in the order of Fe²⁺ > Co²⁺ > Ni²⁺ ≈ Zn²⁺ > Mn²⁺ >> Mg²⁺; K_PN = (x_MeS/m_Meaq)/(x_MnS/m_Mnaq). 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.

中文翻译：

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在超临界条件下，Alabandite和1 mol / L（Ni，Mg，Co，Zn，Fe）Cl2水溶液之间的二价金属离子同时分配

为了弄清矿物和氯化物水溶液之间的元素分配行为，我们进行了实验，以研究镍质（MnS）同时分布Ni 2 ⁺，Mg 2 ⁺，Co 2 ⁺，Zn 2 ⁺，Fe ²⁺和Mn ²⁺离子的分配。 ）和1 mol / L（Ni，Mg，Co，Zn，Fe）Cl ₂水溶液在500–800°C和100 MPa时。使用以下等式计算的体分配系数的顺序为：Fe ²⁺ > Co ²⁺ > Ni 2 ⁺ ≈Zn ²⁺ > Mn ²⁺ >> Mg ²⁺；K _PN =（x_MeS / m _Meaq）/（x _MnS / m _Mnaq）。绘制了分配系数-离子半径（PC-IR）曲线，y轴为分配系数的对数值，x轴为六倍配位点的离子半径。该曲线的峰位于Fe ²⁺的离子半径附近而不是Mn ²⁺的离子半径附近。Zn ²⁺表现出轻微的负分配异常，随着共价键变强，按硫化物矿物<硫化砷矿物<砷矿物的顺序增加。镍²⁺显示出正的分配异常，这表明它更喜欢八面体结构。随着共价键变强，即离子选择性变强，PC-IR曲线的宽度按硫化物矿物>硫化砷矿物>砷矿物的顺序减小。