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Formation of a Mineral Layer during Coke Dissolution into Liquid Iron and Its Influence on the Kinetics of Coke Dissolution Rate

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Abstract

The formation and development of the mineral layer that forms between coke and liquid iron during carbon dissolution has been characterized. Coke particles (−2 mm, +0.5 mm) were added to the top surface of an iron 2 mass pct C melt at representative iron-making temperatures, for periods of time between 2 and 120 minutes, before being quenched. The quenched samples were then sectioned, and the solidified coke-melt interfacial region analyzed in the scanning electron microscope (SEM). Analysis showed that a mineral layer was present at the interface at all experimental temperatures (1450 °C to 1550 °C) from 2 minutes and persisted beyond 120 minutes. The mineral layer was found to be composed of calcium aluminate phases, with the proportions of these phases dictating its morphology. Further, changes observed in the rate of carbon dissolution from the coke were related to the composition and morphology of the mineral layer. The effect of this mineral layer on the rate of carbon dissolution has been interpreted as a change in the reaction control mechanism.

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  1. LECO is a trademark of LECO Corporation, St. Joseph, MI.

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Acknowledgments

The authors thank BlueScope Steel Ltd. and the Australian Research Council for supporting this research. They also thank Dr Huijin Li, Senior Research Scientist, Australian Nuclear Science and Technology Organisation (ANSTO), for access to and assistance using ANSTO SEM facilities.

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Authors and Affiliations

  1. Pyrometallurgical Research Group, University of Wollongong, Wollongong, NSW, 2522, Australia

    Michael W. Chapman (Research Student), Brian J. Monaghan (Senior Lecturer) & Sharon A. Nightingale (Associate Professor)

  2. BlueScope Steel Limited, Port Kembla, NSW, 2505, Australia

    John G. Mathieson (Manager, Iron and Steelmaking Research) & Robert J. Nightingale (Blast Furnace Technology Manager)

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  1. Michael W. Chapman
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  2. Brian J. Monaghan
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  3. Sharon A. Nightingale
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  4. John G. Mathieson
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  5. Robert J. Nightingale
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Corresponding author

Correspondence to Michael W. Chapman.

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Manuscript submitted on September 18, 2007.

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Chapman, M.W., Monaghan, B.J., Nightingale, S.A. et al. Formation of a Mineral Layer during Coke Dissolution into Liquid Iron and Its Influence on the Kinetics of Coke Dissolution Rate. Metall Mater Trans B 39, 418–430 (2008). https://doi.org/10.1007/s11663-008-9145-7

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  • DOI: https://doi.org/10.1007/s11663-008-9145-7

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