Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 275, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2021.119192
Keywords
Electrodialysis; Ion-exchange membrane; Hydrometallurgy; Metal recovery; Nickel ore
Categories
Funding
- CNPq [141346/2016-7, 171241/2017-7, 160320/2019-4]
- FAPESP [2012/51871-9]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-Brasil (CAPES) [001, 88881.190502/2018-01, 88887.362657/2019-00]
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This study evaluated the use of electrodialysis for recovering cobalt, magnesium, manganese, and chromium ions from an acid multicomponent solution. Results showed successful extraction of Co2+, Mn2+, and Mg(2+) ions above 98%, while the extraction of Cr3+ reached only 83%. The differences in metal transport through the membranes were attributed to lower molar concentration, diffusion coefficient, and Stokes radius of chromium ions.
Due to environmental and human health concerns, the need for cleaner techniques able to extract and recover metals from mining process solutions has been increasing. In this work, the use of electrodialysis for recovering cobalt, magnesium, manganese, and chromium ions from an acid multicomponent solution generated in the nickel laterite processing was evaluated. Values of percent extraction above 98% were obtained for Co2+, Mn2+, and Mg(2+ )ions. For Cr3+, the greatest percent extraction obtained was 83%. The results of percent concentration of the species showed the same trend: for Cr3+ ions, it was significantly lower than the others. Such difference in the transport of the metals through the membranes may have occurred due to the lower molar concentration, lower diffusion coefficient, and greater Stokes radius of chromium ions. Thus, the transfer of Cr3+ was hindered by the presence of other cationic species. This was also evidenced by the results of current efficiency and energy consumption associated with each species in solution. Lastly, the results of solution pH throughout the experiments and the final condition of the membranes, which were analyzed by SEM/EDS, indicated that the water dissociation phenomenon occurred at their surfaces.
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