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Thermodynamics of O, N, and S in liquid Fe equilibrated with CaO-AI2O3-MgO slags

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Abstract

Nitrogen and S distribution ratios between CaO-Al2O3-MgO slags and liquid Fe were measured at 1873 K as a function of Al (or Mg, Ca) content in metal, using CaO, MgO, and A12O3 crucibles. Based on the results for the solubility product of MgO, the equilibrium constant,K Mg , for the reaction MgO =Mg +O and the first-order interaction parameter,e MgO (e OMg ), were estimated to be logK Mg = -7.8 ± 0.2 ande MgO = -190 ± 60 (e OMg = -290 ± 90), respectively. The activities of A12O3 at the slag compositions double-saturated with CaO/MgO, MgO/ MgO A12O3, and MgO Al2O3/CaO 2A12O3 components were obtained from the S distribution ratios between slag and metal, coupled with the reported values of sulfide capacities. Nitride capacities were also estimated from the N distribution ratios and the activities of A12O3.

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Authors and Affiliations

  1. Institute for Advanced Materials Processing, Tohoku University, 980, Sendai, Japan

    Ryo Inoue (Assistant Professor) & Hideaki Suito (Professor)

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  1. Ryo Inoue
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  2. Hideaki Suito
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Inoue, R., Suito, H. Thermodynamics of O, N, and S in liquid Fe equilibrated with CaO-AI2O3-MgO slags. Metall Mater Trans B 25, 235–244 (1994). https://doi.org/10.1007/BF02665206

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  • DOI: https://doi.org/10.1007/BF02665206

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