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The Rate of the Phosphorous Reaction Between Liquid Iron and Slag

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Abstract

In the current study, the rates of dephosphorization and rephosphorization of liquid iron with simulated steelmaking slags were investigated at 1873 K (1600° C). The experiments were conducted in an induction furnace with supplemental heating to maintain a consistent temperature within both the metal and slag phases. An integrated form of the rate equation was used to evaluate the results, assuming mass transfer in both the slag and metal was rate controlling. The results of the current and previous studies indicate that the mass transfer parameter, the slag-metal surface area, and the overall mass transfer coefficient (A*k 0), decreased as the reaction proceeded. It is proposed that initially when the rate and oxygen flux are high, the interfacial energy decreases, and the interfacial fluid velocity increases causing disruption of the slag metal interface. The consequent increases in interfacial area and interfacial fluid flow cause A*k 0 to be high initially and then decrease as the oxygen flux decreases.

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Acknowledgments

The authors wish to gratefully acknowledge the support for this research extended by the Center for Iron and Steelmaking Research (CISR) at the Carnegie Mellon University, and its member companies.

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Authors and Affiliations

  1. Materials Processing Solutions Inc., PO Box 1203, Easton, MA, 02334, USA

    Christopher P. Manning (President)

  2. Carnegie Mellon University, 5000 Forbes Avenue, Wean Hall 4319, Pittsburgh, PA, 15213-3890, USA

    Richard J. Fruehan (Professor)

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  1. Christopher P. Manning
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  2. Richard J. Fruehan
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Correspondence to Richard J. Fruehan.

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Manuscript submitted August 14, 2012.

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Manning, C.P., Fruehan, R.J. The Rate of the Phosphorous Reaction Between Liquid Iron and Slag. Metall Mater Trans B 44, 37–44 (2013). https://doi.org/10.1007/s11663-012-9757-9

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