Thermodynamics of chromium oxides in CaO-SiO2-CaF2 slag

Yasushi Okabe, Isao Tajima, Kimihisa Ito

    Research output: Contribution to journalArticle

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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.

    Original languageEnglish
    Pages (from-to)131-136
    Number of pages6
    JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
    Volume29
    Issue number1
    Publication statusPublished - 1998 Feb

    Fingerprint

    chromium oxides
    slags
    Slags
    Chromium
    Thermodynamics
    thermodynamics
    Oxides
    Alkalinity
    Activity coefficients
    Silver
    Partial pressure
    partial pressure
    chromium
    Metals
    silver
    chromium oxide
    Oxygen
    Liquids
    oxygen
    coefficients

    ASJC Scopus subject areas

    • Materials Science(all)
    • Metals and Alloys

    Cite this

    Thermodynamics of chromium oxides in CaO-SiO2-CaF2 slag. / Okabe, Yasushi; Tajima, Isao; Ito, Kimihisa.

    In: Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, Vol. 29, No. 1, 02.1998, p. 131-136.

    Research output: Contribution to journalArticle

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