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Kinetic analysis of NaF vaporization in SiF4-Ar mixture

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Abstract

Slags used in steelmaking and continuous casting that contain SiO2, Na2O, and CaF2 tend to be unstable and gaseous. Species, such as NaF and SiF4, evolve simultaneously from these slags at steelmaking temperatures. In addition, the reaction between NaF and SiF4 can occur to produce Na2SiF6 (sodium hexafluorosilicate). In a previous study on the vaporization of NaF into an inert gas stream, the diffusivity of NaF in argon, nitrogen, and helium was measured. In this study, the rate of NaF vaporization in a SiF4 atmosphere was measured. Ternary diffusion coefficients were then evaluated from the binary diffusion coefficients obtained in a previous study, and a kinetic analysis was carried out. The rate calculations were found to be in accord with the measured results, indicating that the experiments were carried out in a regime where diffusion of NaF from the surface of the sample was rate controlling.

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Author notes

  1. Yoshiaki Kashiwaya (Visiting Professor, Associate Professor)

    Present address: the Department of Materials Science and Engineering, Carnegie Mellon University, 15213, Pittsburgh, PA

Authors and Affiliations

  1. Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Hokkaido, Japan

    Yoshiaki Kashiwaya (Visiting Professor, Associate Professor)

  2. the Department of Materials Science and Engineering, Carnegie Mellon University, 15213, Pittsburgh, PA

    Alan W. Cramb (Professor)

Authors
  1. Yoshiaki Kashiwaya
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  2. Alan W. Cramb
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Kashiwaya, Y., Cramb, A.W. Kinetic analysis of NaF vaporization in SiF4-Ar mixture. Metall Mater Trans B 32, 401–407 (2001). https://doi.org/10.1007/s11663-001-0024-8

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  • DOI: https://doi.org/10.1007/s11663-001-0024-8

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