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In Situ Synchrotron Powder Diffraction Studies of Reduction–Oxidation (Redox) Behavior of Iron Ores and Ilmenite

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Abstract

Phase transformations of two types of iron-based oxides (iron ore and industrial-grade ilmenite) were studied using synchrotron powder diffraction of the samples processed in reducing and oxidizing atmospheres at 1173 K (900 °C) and 1223 K (950 °C), respectively. In iron ore oxidation, the disappearance of the wustite and fayalite phases was followed by hematite growth and a decrease of the magnetite phase. The magnetite phase was partially recovered by treatment in a reducing atmosphere. Ilmenite oxidation initiated decomposition of the ilmenite phase with rapid growth of hematite and gradual growth of the pseudobrookite phase. In a reducing atmosphere, ilmenite was gradually recovered from pseudobrookite with a relatively fast initial decrease in rutile and hematite content. Under reducing conditions, there was interaction of iron ore with magnesio-ferrites in iron ore–ash mixture and interaction of ilmenite with silica by the formation of fayalite.

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Authors and Affiliations

  1. Queensland Centre for Advanced Technologies, CSIRO Energy, 1 Technology Court, Pullenvale, QLD, 4069, Australia

    Alexander Y. Ilyushechkin & Mark Kochanek

  2. Queensland Centre for Advanced Technologies, CSIRO Energy, CESRE Bushells Building, 71 Normanby Road, Clayton North, VIC, 3169, Australia

    Liangguang Tang & Seng Lim

Authors
  1. Alexander Y. Ilyushechkin
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  2. Mark Kochanek
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  3. Liangguang Tang
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  4. Seng Lim
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Correspondence to Alexander Y. Ilyushechkin.

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Manuscript submitted September 13, 2016.

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Ilyushechkin, A.Y., Kochanek, M., Tang, L. et al. In Situ Synchrotron Powder Diffraction Studies of Reduction–Oxidation (Redox) Behavior of Iron Ores and Ilmenite. Metall Mater Trans B 48, 1400–1408 (2017). https://doi.org/10.1007/s11663-017-0919-7

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  • DOI: https://doi.org/10.1007/s11663-017-0919-7

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