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Pre-treatment of Waste Copper Dust (I): Potential of Oxidative Roasting–Density Separation–Sulphuric Acid Leaching Technology for Copper Recovery

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Resource Recovery and Recycling from Waste Metal Dust

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Abstract

Copper sulphides (CS) in most waste copper dust (WCD) are often small but appreciable, contributing to poor copper recovery (CR) during sulphuric acid leaching (SAL). Oxidative roasting (OR) has often been employed to modify mineralogy of WCD for enhanced recovery. But for challenging side reactions (SR) and poor porosity structure (PS), copper recovery from WCD remains poor even after OR pre-treatment. Employing density separation (DS) to pre-treat WCD for reduced SR and enhanced PS holds promise. The aim of this chapter is to present the potentials of introducing DS into OR-SAL technology. This was achieved by comparing OR and DS pre-treatments. Result showed average surface area of WCD decreased by 900% and 1200% when pre-treated with OR and DS, respectively. The pore volume decreased by 320% and 200% when WCD was pre-treated using OR and DS, respectively. However, pore diameter increased by 280% and 400% when WCD was pre-treated with OR and DS, respectively. Furthermore, DS pre-treated particles revealed enhanced micro-porosities in form of peels and cracks. Significant amounts of gangue minerals (e.g. aluminium and silicon) reported to the tailings, presupposing reduced SR and enhanced PS. In conclusion, OR-DS-SAL is a technology with capacity to enhance copper recovery from WCD. Hence, recommended.

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Acknowledgements

The author will want to appreciate Tshwane University of Technology, Pretoria, South Africa, for facilities made available.

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Authors and Affiliations

  1. Department of Chemical Metallurgical and Materials Engineering, Faculty of Engineering and the Built Environment, Tshwane University of Technology, Pretoria, South Africa

    Daniel Ogochukwu Okanigbe

  2. Pantheon Virtual Engineering Solutions, Nigel, South Africa

    Daniel Ogochukwu Okanigbe

  3. Department of Chemical, Metallurgical and Materials Engineering, Faculty of Engineering and the Built Environment, Tshwane University of Technology, Pretoria, South Africa

    Abimbola Patricia Popoola

  4. Department of Materials Science and Engineering, Faculty of Technology, Obafemi Awolowo University, Ile-ife, Osun state, Nigeria

    Abraham Adewale Adeleke

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  1. Daniel Ogochukwu Okanigbe
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Editors and Affiliations

  1. Department of Chemical, Metallurgical and Materials Engineering, Faculty of Engineering and the Built EnvironmentTshwane University of Technology, Pretoria, South Africa

    Daniel Ogochukwu Okanigbe

  2. Department of Chemical, Metallurgical and Materials Engineering, Faculty of Engineering and the Built Environment Tshwane University of Technology, Pretoria, South Africa

    Abimbola Patricia Popoola

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Okanigbe, D.O., Popoola, A.P., Adeleke, A.A. (2023). Pre-treatment of Waste Copper Dust (I): Potential of Oxidative Roasting–Density Separation–Sulphuric Acid Leaching Technology for Copper Recovery. 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_3

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