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Non-isothermal carbothermic reduction kinetics of mechanically activated ilmenite containing self-reducing mixtures

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Abstract

Effect of mechanical activation on carbothermic reduction kinetics and mechanism of ilmenite concentrate containing self-reducing mixture has been investigated using a combination of thermogravimetry and X-ray diffraction. Thermogravimetric comparative study of mechanically activated and non-activated ilmenite concentrate containing self-reducing mixtures with C/O molar ratio of 1.5 was conducted non-isothermally. The samples were heated up to 1573 K at three different heating rates (10, 15, and 20 K min−1) under controlled atmosphere. The reduction mechanism of mechanically activated mixture was followed by X-ray diffraction analysis of arrested samples at different reduction extents. In addition, reaction kinetics was further investigated and corresponding kinetic parameters were estimated using isoconversional (model-free) and model-fitting (Coats–Redfern) methods.

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Acknowledgements

The project was conducted within CAMM—Centre of Advanced Mining and Metallurgy at Luleå University of Technology, Sweden.

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Authors and Affiliations

  1. Minerals Technology Division, Pyrometallurgy Department, Central Metallurgical R&D Institute (CMRDI), P.O Box 87, Cairo, Egypt

    M. H. El-Sadek, H. M. Ahmed, K. El-Barawy & M. B. Morsi

  2. Minerals and Metallurgical Engineering (MiMeR), Lulea University of Technology (LTU), 971 87, Luleå, Sweden

    H. M. Ahmed & B. Björkman

  3. Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt

    H. El-Didamony

Authors
  1. M. H. El-Sadek
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  2. H. M. Ahmed
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  3. K. El-Barawy
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  4. M. B. Morsi
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  5. H. El-Didamony
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  6. B. Björkman
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Correspondence to M. H. El-Sadek.

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El-Sadek, M.H., Ahmed, H.M., El-Barawy, K. et al. Non-isothermal carbothermic reduction kinetics of mechanically activated ilmenite containing self-reducing mixtures. J Therm Anal Calorim 131, 2457–2465 (2018). https://doi.org/10.1007/s10973-017-6743-0

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  • DOI: https://doi.org/10.1007/s10973-017-6743-0

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