Abstract
The investigation focuses on sulphidization of Cu, Co and Fe from a 7wt%CuO-7wt%CoO-10wt%CaO-40wt% SiO2-(30 wt%Fe,6 wt%Al)2O3 slag in the presence of calcium sulphide (CaS), over a temperature range of 1173 K – 1323 K. The metal oxides phases (CuO, CoO, FeO and Fe3O4) in the slag were converted into metal sulphide phases (Cu2S, CuFeS2, FeS, Cu5FeS4, Co8S9) via MO + CaS + SiO2 = MS + CaSiO3 reaction, where M represents metallic Cu, Co or Fe. Cu2S and CoS formed preferentially at low molar ratio of MO/CaS and below 1173 K. The sulphidized slag was reduced in the presence of lime (CaO) and carbon at 1323 K by following the equilibrium: MS + CaO + C = M + CaS + CO(g). The reaction products were characterised by X-ray diffraction and scanning electron microscopy techniques. The proposed method of recovering metallic phases (Cu, Co and Fe) from a Cu-Co slag via sulphidization and reduction at lower reduction temperature than 1373 K offers an energy efficient process.
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Hara, Y.R.S., Jha, A. (2015). Low Temperature Sulphidization of Cu-Co SLAG in the Presence of Calcium Sulphide. In: Jha, A., et al. Energy Technology 2015. Springer, Cham. https://doi.org/10.1007/978-3-319-48220-0_12
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DOI: https://doi.org/10.1007/978-3-319-48220-0_12
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48602-4
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