Innovative technology for processing saprolitic laterite ores by hydrochloric acid atmospheric pressure leaching |
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| Affiliation: | 1. Department of Mathematical and Statistical Sciences, University of Alberta, Edmonton, Alberta, T6G 2G1, Canada;2. Sichuan Provincial Center for Disease Control and Prevention, Chengdu 610041, Sichuan Province, China;3. State Key Laboratory of Infectious Disease Prevention and Control (SKLID), Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Chinese Center for Disease Control and Prevention (China CDC), Beijing 102206, China;4. Guangxi Key Laboratory of AIDS Prevention and Treatment, School of Public Health, Guangxi Medical University, Nanning, Guangxi 530021, China;5. Butuo Township Hospital, Butuo County, Sichuan Province, China;6. Liangshan Prefecture Center for Disease Control and Prevention, Sichuan Province, China;7. Butuo Center for Disease Control and Prevention, Butuo County, Sichuan Province, China;8. Butuo People’s Hospital, Butuo County, Sichuan Province, 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 |
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| Abstract: | An innovative technology for processing saprolitic laterite ores from the Philippines by hydrochloric acid atmospheric leaching and spray hydrolysis is proposed. The factors that affect the hydrochloric acid atmospheric leaching of the laterite ores and spray hydrolysis of the atmospheric acid leach solution are investigated. Experimental results show that the leaching of Ni, Fe, and Mg is 98.9 wt%, 97.8 wt%, and 80.9 wt%, respectively, under optimal acid leaching conditions. The hydrolysis of Ni and Fe by the atmospheric acid leach solution approaches 100 wt% at the temperature range of 450–500 °C. Characterization results show that a serpentine mineral, nominally Mg3Si2O5(OH)4, is the major component and goethite, FeO(OH), is the minor one in the laterite ores. Treatment by hydrochloric acid atmospheric leaching breaks the mineral lattices of the laterite ores and makes amorphous silica the primary product in the atmospheric acid leach residue. The grade of Ni in the hydrolyzate increases to 4.55%. The hydrolyzate with high Ni content can be utilized for ferro-nickel production. |
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| Keywords: | Saprolitic laterite ores Hydrochloric acid Atmospheric leaching Spray hydrolysis Ferro-nickel |
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