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Thermodynamics of chromium oxides in CaO-SiO2-CaF2 slag

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Abstract

The distribution ratio of chromium between a CaO-SiO2-CaF2 slag and liquid silver under the oxygen partial pressure used in practical hot-metal dephosphorization treatment was measured at 1623 K. The distribution ratio was minimal when the basicity index of a slag, wt pct CaO/wt pct SiO2, was about 2. The redox equilibrium between CrO (Cr2+) and CrO1.5 (Cr3+) in the slag was also measured as a function of slag composition. The calculated activity coefficient of CrO had a maximum value at wt pct CaO/wt pct SiO2=2, whereas that of CrO1.5 decreased monotonously with the increase in slag basicity.

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Author notes

  1. Yasushi Okabe (Graduate Student) & Isao Tajima (Graduate Student)

    Present address: the Department of Materials Science and Engineering, Waseda University, 169, Tokyo, Japan

Authors and Affiliations

  1. CSK Company, 163, Tokyo, Japan

    Yasushi Okabe (Graduate Student)

  2. Dainippon Printing Company, 354, Saitama, Japan

    Isao Tajima (Graduate Student)

  3. the Department of Materials Science and Engineering, Waseda University, 169, Tokyo, Japan

    Kimihisa Ito (Professor)

Authors
  1. Yasushi Okabe
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  2. Isao Tajima
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  3. Kimihisa Ito
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Okabe, Y., Tajima, I. & Ito, K. Thermodynamics of chromium oxides in CaO-SiO2-CaF2 slag. Metall Mater Trans B 29, 131–136 (1998). https://doi.org/10.1007/s11663-998-0015-0

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  • DOI: https://doi.org/10.1007/s11663-998-0015-0

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