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Kinetics of Silicothermic Reduction of Manganese Oxide for Advanced High-Strength Steel Production

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Abstract

The kinetics of silicothermic reduction of manganese oxide from MnO–SiO2–CaO–Al2O3 slags reacting with Fe-Si droplets were studied in the temperature range of 1823 K to 1923 K (1550 °C to 1650 °C). The effects of initial droplet mass, initial droplet silicon content, and initial slag manganese oxide content were studied. Data obtained for 15 pct silicon showed agreement with control by mass transport of MnO in the slag with a mass transfer coefficient (k s) of 4.0 × 10−5 m/s at 1873 K (1600 °C). However, when this rate-determining step was tested at different initial silicon contents, the agreement was lost, suggesting mixed control between silicon transport in the metal and manganese oxide transport in the slag. Increasing the temperature resulted in a decrease in the rate of reaction because of an increase in the favorability of SiO as a product. Significant gas generation was found during all experiments, as a result of silicon monoxide production. The ratio of silicon monoxide to silica formation was increased by factors favoring silicon transport over that of manganese, further supporting the conclusion that the reaction is under mixed control by transports of both silicon and manganese oxide.

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Acknowledgments

The authors thank the Natural Science and Engineering Research Council of Canada (NSERC, STPGP463252-14) for the funding support. The authors offer their special thanks to Arcelor Mittal Dofasco, US Steel Canada, Praxair, and Hatch Ltd. acknowledging their in-kind support, technical expertise, and their many helpful discussions.

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  1. McMaster Steel Research Centre, Department of Materials Science and Engineering, McMaster University, Hamilton, L8S 4L8, Canada

    B. J. Jamieson & K. S. Coley

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  1. B. J. Jamieson
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  2. K. S. Coley
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Correspondence to K. S. Coley.

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Manuscript submitted September 30, 2016.

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Jamieson, B.J., Coley, K.S. Kinetics of Silicothermic Reduction of Manganese Oxide for Advanced High-Strength Steel Production. Metall Mater Trans B 48, 1613–1624 (2017). https://doi.org/10.1007/s11663-017-0967-z

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