Deoxidation Equilibrium of Calcium in Liquid Iron

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  • ITOH Hiroyasu
    Research Student, Tohoku University, now Yoshizawa Lime Industry
  • HINO Mitsutaka
    Faculty of Engineering, Tohoku University
  • BAN-YA Shiro
    Professor Emeritus, Tohoku University;Akita National College of Technology

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Other Title
  • 溶鉄のCa脱酸平衡
  • ヨウテツ ノ Ca ダツサン ヘイコウ

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Abstract

The previous literature thermodynamic values for deoxidation equilibrium relation shows a loop of reciprocal Ω shape in the figure which shows the relation between calcium and oxygen dissolved in liquid iron. This means one concentration of calcium corresponds to two or more concentration of oxygen and vice versa. This discrepancy between predicted and measured results is due to an incomplete expression of the activities of dissolved calcium and oxygen in current literature. It causes by use of only 1st order interaction parameters to express the activities of calcium and oxygen. In the present work, the deoxidation equilibrium of calcium was studied to develop values for the 1st and 2nd order interaction parameters including cross products too. As the result, the thermodynamic values of calcium deoxidation obtained was in good agreement with the observed values.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 83 (11), 695-700, 1997

    The Iron and Steel Institute of Japan

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