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Thermodynamic estimation on the reduction behavior of iron-chromium ore with carbon

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Abstract

The thermodynamics for reduction of iron-chromium ore by carbon is discussed. The thermodynamic properties of iron-chromium ore were evaluated from our previous work on the activities of constituents in the FeO·Cr2O3-MgO·Cr2O3-MgO·Al2O3 iron-chromite spinel-structure solid solution saturated with (Cr, Al)2O3, and those of the Fe-Cr-C alloy were estimated by a sublattice model. The stability diagrams were drawn for carbon reduction of pure FeO · Cr2O3, (Fe0.5Mg0.5)O·(Cr0.8Al0.2)2O3 iron-chromite solid solution, and South African iron-chromium ore. The evaluated stability diagrams agreed well with the literature data. It was concluded that the lowest temperature for reduction of FeO · Cr2O3 in the iron-chromium ore was 1390 K and a temperature higher than 1470 K would be necessary to reduce Cr2O3 in MgO·(Cr,Al)2O3 in the prereduction process of iron-chromium ore. The composition of liquid Fe-Cr-C alloy in equilibrium with iron-chromium ore was also estimated under 1 atm of CO at steelmaking temperature. The predicted metal composition showed reasonable agreement with the literature values.

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Author notes

  1. Kenichi Higuchi (Graduate Student, Researcher)

    Present address: the Department of Metallurgy, Graduate School of Engineering, Tohoku University, 980-77, Sendai, Japan

Authors and Affiliations

  1. the Department of Metallurgy, Graduate School of Engineering, Tohoku University, 980-77, Sendai, Japan

    Mitsutaka Hino (Professor), Tetsuya Nagasaka (Associate Professor) & Shiro Ban-Ya (Professor Emeritus, President)

  2. the Ironmaking Laboratory, R&D Bureau, Nippon Steel Corporation, 299-12, Futtsu, Japan

    Kenichi Higuchi (Graduate Student, Researcher)

  3. Akita National College of Technology, 011, Akita, Japan

    Shiro Ban-Ya (Professor Emeritus, President)

Authors
  1. Mitsutaka Hino
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  2. Tetsuya Nagasaka
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  3. Kenichi Higuchi
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  4. Shiro Ban-Ya
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Hino, M., Nagasaka, T., Higuchi, K. et al. Thermodynamic estimation on the reduction behavior of iron-chromium ore with carbon. Metall Mater Trans B 29, 351–360 (1998). https://doi.org/10.1007/s11663-998-0112-0

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  • DOI: https://doi.org/10.1007/s11663-998-0112-0

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