Solubility of calcium and oxygen in molten iron Equilibrated with slag in CaO, Al2O3 or CaO-stabilized ZrO2 crucible at 1 873 K

Ichiro Seki, Kazuhiro Nagata, Tetsuya Ashino, Jun Tanabe

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    The solubility of calcium and oxygen in molten iron equilibrated with CaO-Al2O3-ZrO2 molten slag in CaO, Al 2O3 or 5.5 mass% CaO-stabilized ZrO2 crucible at 1 873 K was measured by means of the slagmetal equilibrium partition method under Ar gas atmosphere. From the results by XRD and the phase diagram of CaO-Al2O3-ZrO2 system, the slag in a CaO crucible was in equilibrium with CaO·ZrO2 and CaO and the slag composition was 57.36 mass% CaO-34.86% Al2O3-7.78% ZrO2. The slag in a Al2O3 crucible was in equilibrium with CaO·2Al2O3 and ZrO2-CaO solid solution (Css) and the slag composition was 27.08 mass% CaO-53.42% Al2O3-19.50% ZrO2. The slag in a CaO-stabilized ZrO2 crucible was in equilibrium with ZrO2-CaO solid solution (Css) and CaO·ZrO2 and the slag composition was 30.38 mass% CaO- 51.56% Al2O3-18.06% ZrO2. The average concentrations of oxygen and calcium in molten iron in equilibrium with slag and compounds were 251 ppm and 3 ppm in a CaO crucible, 33 ppm and 4 ppm in an Al2O3 crucible and 21 ppm and 5 ppm in a CaO-stabilized ZrO2 crucible, respectively. The logarithm of equilibrium constant, logK, for the reaction of CaO(s) = Ca + O is -4.38 and the interaction parameter of eCa°O is -31.8. The value is satisfied the thermodynamic phase stability.

    Original languageEnglish
    Pages (from-to)1369-1374
    Number of pages6
    JournalIsij International
    Volume51
    Issue number9
    DOIs
    Publication statusPublished - 2011 Sep 15

    Keywords

    • AlO
    • CaO
    • CaO-stabilized ZrO
    • Calcium
    • Molten iron
    • Oxygen
    • Solubility

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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