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Influence of alumina on mineralogy and environmental properties of zinc-copper smelting slags

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Abstract

An iron-silicate slag, from a zinc-copper smelting process, and mixtures of this slag with 5wt%, 10wt%, and 15wt% alumina addition were re-melted, semi-rapidly solidified, and characterized using scanning electron microscopy equipped with energy dispersive spectroscopy, and X-ray diffraction. The FactSage™6.2 thermodynamic package was applied to compare the stable phases at equilibrium conditions with experimental characterization. A standard European leaching test was also carried out for all samples to investigate the changes in leaching behaviour because of the addition of alumina. Results show that the commonly reported phases for slags from copper and zinc production processes (olivine, pyroxene, and spinel) are the major constituents of the current samples. A correlation can be seen between mineralogical characteristics and leaching behaviours. The sample with 10wt% alumina addition, which contains high amounts of spinels and lower amounts of the other soluble phases, shows the lowest leachabilities for most of the elements.

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Authors and Affiliations

  1. Minerals and Metals Research Laboratory, Luleå University of Technology, 97187, Luleå, Sweden

    Sina Mostaghel, Caisa Samuelsson & Bo Björkman

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  1. Sina Mostaghel
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  2. Caisa Samuelsson
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  3. Bo Björkman
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Correspondence to Sina Mostaghel.

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Mostaghel, S., Samuelsson, C. & Björkman, B. Influence of alumina on mineralogy and environmental properties of zinc-copper smelting slags. Int J Miner Metall Mater 20, 234–245 (2013). https://doi.org/10.1007/s12613-013-0718-3

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  • DOI: https://doi.org/10.1007/s12613-013-0718-3

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