Abstract
Sulfuric acid leaching was conducted on waste copper dust. The deductions reached are that extraction of copper from waste copper dust (WCD) takes place rapidly and plateaus after approximately 30 minutes. This trend was observed across the different concentrations. The presence of Fe2+ in the leach solutions has the capacity to lower the Eh, thus causing the plateau in copper extraction. Pulp stirring was considered for effective leaching. However, in this study its impact on copper recovery is not significant, and this can be attributed to the substantial presence of reactive gangue minerals like quartz 11.45 wt% and mullite 42.97 wt%. The presence of reactive gangue minerals has the capacity to enhance consumption of hydrogen ions through side reactions. Hence, the removal/reduction of reactive gangue minerals from the WCD has been reported in other reports. This action is expected to reduce side reactions during leaching of copper from WCD, thereby enhancing contact time between H2SO4 solution and copper minerals as pulp is stirred. The restraining of iron dissolution achieved 29.03% iron reduction under a condition of compositional proportion of 197 mL H2SO4: 3 mL FeSO4.7H2O.
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We thank Pantheon Virtual Engineering Solutions, Nigel, South Africa, and Tshwane University of Technology, Pretoria, South Africa, for the support received.
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Magwanyana, Z., Okanigbe, D.O., Popoola, A.P., Adeleke, A.A. (2023). Extraction of Copper Oxide (I): Purified CuSO4 Solution. In: Ogochukwu Okanigbe, D., Popoola, A.P. (eds) Resource Recovery and Recycling from Waste Metal Dust. Springer, Cham. https://doi.org/10.1007/978-3-031-22492-8_5
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