Atmospheric leaching characteristics of nickel and iron in limonitic laterite with sulfuric acid in the presence of sodium sulfite |
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| Affiliation: | 1. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Beijing 100190, China;2. Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Kunming University of Science and Technology, Kunming 650500, China;1. Chemical & Metallurgical Engineering & Chemistry, School of Engineering and Information Technology, Murdoch University, 90, South Street, Murdoch, Perth WA6150, Australia;2. CSIRO Mineral Resources Flagship, Australian Minerals Research Centre, PO Box 7229, Karawara, Perth WA6152, Australia;1. Institute of Resources and Environmental Engineering, State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources, Shanxi University, Taiyuan 030006, PR China;2. Shanxi Collaborative Innovation Center of High Value-added Utilization of Coal-related Wastes, Taiyuan 030006, PR China;3. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, PR China |
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| Abstract: | Atmospheric leaching of nickel from limonitic laterite ores is regarded as a promising approach for nickel production, despite its low nickel recovery and slower leaching rate than high pressure acid leaching. Sulfur dioxide can enhance the sulfuric acid leaching of laterite, but its behavior for enhancing atmospheric sulfuric acid leaching was uncertain due to SO2 losses and emission. In this study, sodium sulfite was used as a substitute for SO2 gas in the leaching and the sulfuric acid leaching characteristics of Ni and Fe from a limonitic laterite in the presence of sodium sulfite were investigated. A linear correlation exists between the extraction of Ni and Fe, indicating the difficulty in selective leaching of Ni over Fe. Most nickel is isomorphically substituted within the goethite and it is difficult to dissolve in a high oxidation–reduction potential solution environment, resulting in a low nickel recovery. SO2(aq) generated from the reaction of sodium sulfite in sulfuric acid solution, lowers the potential for the reducing reaction of FeOOH to give Fe2+, accelerating the iron extraction and nickel liberation from goethite. |
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| Keywords: | Nickel Limonitic laterite Atmospheric leaching Sodium sulfite |
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