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Reduction rate of SiO2 in slag by carbon- saturated iron

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Abstract

The reduction rate of SiO2 from CaO-SiO2-Al2O3 and CaO-SiO2-Al2O3-TiO2 slags by carbon-saturated iron melts was investigated over the temperature range 1350 °C to 1600 °C under an argon atmosphere. It was found that the reduction rate of silicon increased with in-creasing temperature and decreased with increasing ratio of CaO/SiO2 in these slags. A kinetic analysis of the experimental results developed on the basis of the two film theory showed that the silicon transport rate from slag to metal phase was controlled by the rate of chemical reaction at the slag-metal interface. The rate constants obtained for the reaction were 10 g m-2 s-1 at 1550 °C. The apparent activation energy was 238.0 kJ mol-1.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, the University of Michigan, 48109-2136, Ann Arbor, MI

    Haiping Sun (Visiting Research Scientist) & Robert D. Pehlke (Professor)

  2. Department of Materials Science and Engineering, Kyushu University, 812, Hakozaki, Fukuoka, Japan

    Katsumi Mori (Professor)

Authors
  1. Haiping Sun
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  2. Katsumi Mori
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  3. Robert D. Pehlke
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Sun, H., Mori, K. & Pehlke, R.D. Reduction rate of SiO2 in slag by carbon- saturated iron. Metall Trans B 24, 113–120 (1993). https://doi.org/10.1007/BF02657877

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  • DOI: https://doi.org/10.1007/BF02657877

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