Reduction equilibria at the final stage of reduction of quaternary calcium ferrite with CO-CO2 gas mixtures

Takayuki Maeda, Yoichi Ono

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    16 Citations (Scopus)

    Abstract

    Quaternary calcium ferrite was synthesized from chemical reagents of Fe2O3, CaCO3, SiO2, and Al2O3 and reduction equilibria at the final stage of reduction with CO-CO2 gas mixtures were studied. Dicalcium ferrite, which is produced during the reduction of binary calcium ferrite, is not found in the reduction of quaternary calcium ferrite. The reduction stage from dicalcium ferrite to iron and CaO is therefore not existent in the reduction. The reaction at the final stage of carbon monoxide reduction is given by equation 'FeO'(s)+CO(g) = Fe(s)+CO2(g) where 'FeO' is the wustite which contains CaO, SiO2 and Al2O3 as solid solutions. The temperature dependence of the apparent equilibrium constant K(=PCO(2)/PCO) of the reaction is given by the equation K=exp(-2.785 + 2,042/T) ± 0.003 (1,073-1,326 K).

    Original languageEnglish
    Pages (from-to)416-423
    Number of pages8
    JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
    Volume75
    Issue number3
    DOIs
    Publication statusPublished - 1989

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Physical and Theoretical Chemistry
    • Metals and Alloys
    • Materials Chemistry

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