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Open AccessArticle

Simultaneous Partitioning of Divalent Metal Ions between Alabandite and 1 mol/L (Ni, Mg, Co, Zn, Fe)Cl2 Aqueous Solutions under Supercritical Conditions

Department of Resources and Environmental Engineering, School of Creative Science and Engineering, Waseda University, Shinjuku, Tokyo 169-8555, Japan
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Minerals 2020, 10(8), 696; https://doi.org/10.3390/min10080696
Received: 21 July 2020 / Revised: 2 August 2020 / Accepted: 4 August 2020 / Published: 5 August 2020
(This article belongs to the Special Issue Distribution of Major- and Trace-Elements in Igneous Minerals)
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+; 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. View Full-Text
Keywords: alabandite; aqueous chloride solution; supercritical condition; partitioning; divalent cation alabandite; aqueous chloride solution; supercritical condition; partitioning; divalent cation
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MDPI and ACS Style

Uchida, E.; Murasugi, M.; Okuda, S. Simultaneous Partitioning of Divalent Metal Ions between Alabandite and 1 mol/L (Ni, Mg, Co, Zn, Fe)Cl2 Aqueous Solutions under Supercritical Conditions. Minerals 2020, 10, 696. https://doi.org/10.3390/min10080696

AMA Style

Uchida E, Murasugi M, Okuda S. Simultaneous Partitioning of Divalent Metal Ions between Alabandite and 1 mol/L (Ni, Mg, Co, Zn, Fe)Cl2 Aqueous Solutions under Supercritical Conditions. Minerals. 2020; 10(8):696. https://doi.org/10.3390/min10080696

Chicago/Turabian Style

Uchida, Etsuo; Murasugi, Motoki; Okuda, Shuichi. 2020. "Simultaneous Partitioning of Divalent Metal Ions between Alabandite and 1 mol/L (Ni, Mg, Co, Zn, Fe)Cl2 Aqueous Solutions under Supercritical Conditions" Minerals 10, no. 8: 696. https://doi.org/10.3390/min10080696

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