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Representation of Oxidation Ability for Metallurgical Slags Based on the Ion and Molecule Coexistence Theory

Authors

  • Xue-min Yang,

    Corresponding author
    1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, P. R. China
    • State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing100190P. R. China

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  • Meng Zhang,

    1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, P. R. China
    2. Beijing Metallurgical Equipment Research Design Institute Company Limited, China Metallurgical Group Corporation, Beijing, P. R. China
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  • Jian-liang Zhang,

    1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, P. R. China
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  • Peng-cheng Li,

    1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, P. R. China
    2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, P. R. China
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  • Jin-yan Li,

    1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, P. R. China
    2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, P. R. China
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  • Jian Zhang

    1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, P. R. China
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Abstract

The defined oxidation ability of metallurgical slags based on the ion and molecule coexistence theory (IMCT), i.e., the comprehensive mass action concentration math formula of iron oxides, has been verified through comparing the calculated math formula and the reported activity math formula of iron oxides in the selected FetO-containing slag systems. To calculate the defined comprehensive mass action concentration math formula of iron oxides in the selected slag systems, a thermodynamic model for calculating the mass action concentrations of structural units or ion couples in CaO–SiO2–MgO–FeO–Fe2O3–MnO–Al2O3–P2O5 type slags, i.e., the IMCT-Ni thermodynamic model, has been developed. The defined comprehensive mass action concentration math formula of iron oxides is more accurate than the measured activity math formula of iron oxides to represent the slag oxidation ability of the selected FetO-containing slag systems. The calculated comprehensive mass action concentration math formula of iron oxides or the reported activity math formula of iron oxides in the selected FetO-containing slag systems shows an increase tendency with an increase of optical basicity of the slags by taking math formula as 0.93 and math formula as 0.69, or math formula as 1.0 and math formula as 0.75, rather than by taking math formula as 0.51 and math formula as 0.48. The slag oxidation ability represented by the defined comprehensive mass action concentration math formula of iron oxides or the measured activity math formula of iron oxides is not only decided by the effects of iron oxides, but also by the comprehensive effects of both iron oxides and basic oxides as CaO or MgO or MnO in the selected FetO-containing slag systems.

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