Properties of electrolyte solutions relevant to high concentration chloride leaching. III. Solubility of pertinent solids and iron(III)/iron(II) redox potential measured in concentrated magnesium chloride solutions

E. Königsberger; L.C. Königsberger; P. May; B. Harris

doi:10.1016/j.hydromet.2007.10.010

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Properties of electrolyte solutions relevant to high concentration chloride leaching. III. Solubility of pertinent solids and iron(III)/iron(II) redox potential measured in concentrated magnesium chloride solutions

Journal article

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Properties of electrolyte solutions relevant to high concentration chloride leaching. III. Solubility of pertinent solids and iron(III)/iron(II) redox potential measured in concentrated magnesium chloride solutions

E. Königsberger, L.C. Königsberger, P. May and B. Harris

Hydrometallurgy, Vol.90(2-4), pp.192-200

2008

DOI: https://doi.org/10.1016/j.hydromet.2007.10.010

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Abstract

Results of solubility measurements of nickel chloride, manganese chloride, iron(II) chloride, hematite and akaganeite in aqueous solutions of MgCl2 (0.5–3.5 mol L− 1) at temperatures of 60 and 90 °C are reported. Solubilities of metal(II) chlorides decrease almost linearly with MgCl2 concentration due to the common ion effect. Nickel chloride and iron(II) chloride solubilities are very similar, while manganese chloride is about 30% more soluble. Hematite is more stable (i.e. less soluble) than akaganeite under all conditions investigated in this study, while ferrihydrite is considerably less stable. In other words, there is no change in the relative stabilities of these phases effected by the presence of high magnesium chloride concentrations. The solubility of all of these phases decreases with temperature and, for each temperature, the solubility constants increase linearly with the MgCl2 concentration. The present results allow the prediction of the iron concentration as a function of the H+ and MgCl2 molality at equilibrium with hematite or akaganeite. The Fe(III)/Fe(II) redox behaviour has been characterized in concentrated aqueous solutions of MgCl2 (1.5–3.5 mol L− 1) at a temperature of 25 °C. Standard redox potentials are ca. 100 mV lower than at infinite dilution and change linearly by only 13 mV in the range 2–4 mol L− 1 MgCl2.

Details

Title: Properties of electrolyte solutions relevant to high concentration chloride leaching. III. Solubility of pertinent solids and iron(III)/iron(II) redox potential measured in concentrated magnesium chloride solutions
Authors/Creators: E. Königsberger (Author/Creator) - Murdoch University
L.C. Königsberger (Author/Creator) - Murdoch University
P. May (Author/Creator) - Murdoch University
B. Harris (Author/Creator) - Metallurgical Consultant, Montreal, Quebec, Canada
Publication Details: Hydrometallurgy, Vol.90(2-4), pp.192-200
Publisher: Elsevier BV
Identifiers: 991005541295607891
Murdoch Affiliation: School of Chemical and Mathematical Science
Language: English
Resource Type: Journal article

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Collaboration types: International collaboration
Citation topics: 2 Chemistry; 2.89 Ionic, Molecular & Complex Liquids; 2.89.462 Excess Molar Volumes
Web Of Science research areas: Metallurgy & Metallurgical Engineering
ESI research areas: Materials Science