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Determination of the chemical diffusion of oxygen in liquid iron oxide at 1615 °c

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Abstract

The chemical diffusion of oxygen in liquid iron oxide has been studied by the oxidation of a melt in a long capillary at 1615 °C. When pure oxygen was used as the oxidizing agent, the surface composition of the slag was found to be in close agreement with the expected gas-slag equilibrium, suggesting that diffusion is the controlling step. This was not the case when air, 5 pct oxygen in argon or pure CO2 was used to oxidize the slag. The deviation of the surface composition from the expected equilibrium was in accordance with a mechanism of mixed control by both the gas-slag reaction and diffusion in the bulk. The average value of the chemical diffusivity of oxygen (or iron) in liquid iron oxide with Fe2+/Fe T between 0.25 and 0.77 was established to be 3(±1) × 10-7 m2/s. This value is one to two orders of magnitude higher than those from earlier studies. There seems to be a reasonable correlation between the chemical and the ionic self-diffusivities through the Darken equation. A quantitative analysis in this respect and on the role of electron hole migration depends on the availability of data on the ionic conductivity and the tracer diffusivities.

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Authors and Affiliations

  1. BHP Research-Melbourne Laboratories, Mulgrave, Australia

    Y. Sayadyaghoubi (Research Engineer/Scientist)

  2. CSIRO Division of Minerals, G.K. Williams Cooperative Research Center for Extractive Metallurgy, Clayton, Australia

    S. Sun (Senior Research Scientist) & S. Jahanshahi (Program Manager and Principal Research Scientist)

Authors
  1. Y. Sayadyaghoubi
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  2. S. Sun
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  3. S. Jahanshahi
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Formerly Postgraduate Student

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Sayadyaghoubi, Y., Sun, S. & Jahanshahi, S. Determination of the chemical diffusion of oxygen in liquid iron oxide at 1615 °c. Metall Mater Trans B 26, 795–802 (1995). https://doi.org/10.1007/BF02651726

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  • DOI: https://doi.org/10.1007/BF02651726

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