Sulfuric acid oxygen-pressure leaching of Ni3S2 prepared by a wet process |
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| Affiliation: | 1. University of South Australia, Future Industries Institute, Mawson Lakes Campus, Mawson Lakes, Adelaide, South Australia 5095, Australia;2. Current affiliation: School of Engineering Edith Cowan University, 270 Joondalup Drive, Joondalup 6027, Australia;1. Department of Civil and Environmental Engineering and Earth Sciences, 156 Fitzpatrick Hall, University of Notre Dame, Notre Dame, IN 46556, USA;2. Department of Physics, 225 Nieuwland Science Hall, University of Notre Dame, Notre Dame, IN 46556, USA;1. Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario, M5S 3E4, Canada;2. Department of Materials Engineering, University of British Columbia, 309-6350 Stores Road, Vancouver, British Columbia, V6T 1Z4, Canada |
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| Abstract: | Ni3S2 prepared by a wet process was easily leached as nickel sulfate at 383 K, po2 1 MPa, and sulfuric acid concentration of 0.1–0.15 mol L−1. The leaching reaction proceeds through the intermediate formation of NiS prior to complete dissolution. A constant leaching rate was observed for most of the duration of the reaction, and this has been attributed to an increase in the specific surface area of the sulfide particles. A thin sulfur layer was formed on the sulfide; the diffusion of oxygen through the sulfur layer was found to be rate-determining. |
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