Abstract
Cobalt/nickel residue has a high content of arsenic, and it poses a great threat to humans. It is absolutely necessary to treat the residue. In this study, the leaching of cobalt/nickel residue using alkali at atmospheric pressure was reported. The results showed that the optimum condition was as follows: 16 g of oxidant reagent, alkali concentration of 5 mol/L, reaction temperature of 80°C and reaction time of 2 h. Under those conditions, the leaching ratios of arsenic and zinc reached about 99% and 87%, whereas cobalt, copper and nickel remained non-dissolved. Based on thermal analysis and kinetics calculation, the activation energy of the leaching process was 42.06 kJ/mol, and the reaction order was 2.77. This work effectively recovered arsenic from this hazardous residue, greatly reducing environmental pollution. It also laid a solid foundation for further comprehensive recovery of valuable metals from the zinc metallurgy process.
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Acknowledgements
This work was supported by the Natural Science Foundation of Hunan Province (No. 20191106), the Opening Project of State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization, the National Key Technology Support Program (2015BAB19B03) and the Research Fund Program of State Key Laboratory of Rare Metals Separation and Comprehensive Utilization (No. GK-201805).
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Chen, A., Qiao, J., Long, S. et al. Recovery of Arsenic from Arsenic-Bearing Cobalt/Nickel Residue Using Sodium Persulfate. JOM 71, 3682–3687 (2019). https://doi.org/10.1007/s11837-019-03611-8
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DOI: https://doi.org/10.1007/s11837-019-03611-8