Abstract
With different properties, zinc is one of the most important non-ferrous metals and it is used in various application areas, especially as an anti-corrosion agent. In Turkey, zinc production was based on zinc carbonate ores (ZnCO3), at Çinkur plant from establishment to 1997 due to high reserves of zinc carbonate. After that, zinc concentrate coming from Iran was used in this plant over the last two decades. Thus, two different leach residues called as Turkish leach residue (TLR) and Iranian leach residue (ILR) were accumulated more than one million ton in Çinkur stock piles. In this study, it is aimed to investigate zinc recovery for each leach residue by use of sulphuric acid (H2SO4) and to compare the TLR and the ILR. Initially, detailed chemical, mineralogical and thermal analyses of these different leach residues were carried out. In order to investigate the effect of acid concentration and reaction duration on zinc recovery, leaching experiments were carried out at following conditions: 95 °C, 100 g/L pulp density and 600 rpm stirring rate. According to the characterization results, the chemical compositions for both residues are nearly similar; however, experimental results show that zinc recovery per cent of the ILR was higher than that of TLR for all experimental durations and acid concentrations. This may be due to the presence of Zn-containing compounds in the both residues at different percentages.
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Acknowledgement
The authors would like to thank the Karamanoğlu Mehmetbey University Scientific Research Council for their financial support with project no KMU-BAP-04-M-15.
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Funding was provided by Karamanog˘lu Mehmetbey University (Grant No. KMU-BAP-04-M15).
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Editorial responsibility: M. Abbaspour.
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Rüşen, A., Topçu, M.A. Investigation of zinc extraction from different leach residues by acid leaching. Int. J. Environ. Sci. Technol. 15, 69–80 (2018). https://doi.org/10.1007/s13762-017-1365-4
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DOI: https://doi.org/10.1007/s13762-017-1365-4