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Thermal analysis and kinetics of the oxidative roasting process of a copper smelter dust

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Abstract

As a result of the increasing global demand for refined copper, the reserves of primary sources of copper have been decreasing at a tremendously fast rate; which thus makes secondary copper processing an ever-increasing importance within the global copper industry. Copper smelter dust (CSD) is a potential secondary source of copper that is produced during copper pyrometallurgy. The significant amount of copper value these CSDs often plays host to prompts the need to develop processes to meaningfully remove sulfur and other associated impurities from it, prior to subsequent treatment in the copper recovery process. Hence, this present work carried out a thermal analysis and kinetic study on the oxidative roasting process of copper smelter dust under non-isothermal condition in air using DSC-TGA equipment. The non-isothermal experiments were carried out at heating rates of 5, 10, 15, and 20 °C/min, from room temperature up to 1000 °C. The intermediate phases formed in each stage of the oxidative roasting of the CSD were identified. After the first weight loss step, sulfate compounds were mainly formed in the second stage, and approximately 48% of sulfur contained in the metallurgical waste was removed. In the third stage, the sulfur removal reaction was carried out; the rest of sulfur was nearly removed in this stage. Kinetics of the third stage was analyzed from the dynamic DSC-TGA data by means of Coats and Redfern equation. The nucleation and growth model yielded a satisfactory fit to these experimental data.

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Authors and Affiliations

  1. Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria, 0183, South Africa

    D. O. Okanigbe & A. P. I. Popoola

  2. Department of Materials Science and Engineering, Obafemi Awolowo University, Ile-Ife, 220002, Nigeria

    A. A. Adeleke

Authors
  1. D. O. Okanigbe
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  2. A. P. I. Popoola
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  3. A. A. Adeleke
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Correspondence to D. O. Okanigbe.

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Okanigbe, D.O., Popoola, A.P.I. & Adeleke, A.A. Thermal analysis and kinetics of the oxidative roasting process of a copper smelter dust. Int J Adv Manuf Technol 94, 2393–2400 (2018). https://doi.org/10.1007/s00170-017-0789-9

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  • DOI: https://doi.org/10.1007/s00170-017-0789-9

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