Abstract
The reoxidation behavior of steels by slag in the secondary steelmaking process was addressed by investigating the thermodynamic equilibria between the liquid iron containing Mn and P and CaO-MgO-SiO2-Al2O3-P2O5-MnO-Fe t O ladle slag at 1873 K. The activity coefficient of Fe t O shows a maximum value in the vicinity of the basicity ((X CaO + X MgO + X MnO)/(X SiO2 + X Al2O3 + X P2O5)) = 2.5 at the specific mole fraction range of Fe t O, while that of MnO seems to increase gradually with increasing the basicity. However, the values of \(\gamma _{Fe_t O} \) and γ MnO showed minima with respect to P2O5 content of slag. In addition, the values of \(\gamma _{Fe_t O} \) and γ MnO increased as (pct CaO)/(pct Al2O3) ratio increased at given SiO2, MgO, and P2O5 contents. The conversion equations between the Fe t O and MnO activities and their calculated activities via regular solution model were derived by the correlation between the measured and calculated activities over the limited ranges of Fe t O and MnO contents. The regular solution model was used to estimate the oxygen potential in the slag. For MgO saturated slags, \(a_{Fe_t O_{(l)} } = 0.864a_{FeO_{(R.S.)} } ,a_{MnO_{(l)} } = 6.38a_{MnO_{(R.S.)} } \). For Al2O3 saturated slags, \(a_{Fe_t O_{(l)} } = 2.086a_{FeO_{(R.S.)} } ,a_{MnO_{(l)} } = 14.39a_{MnO_{(R.S.)} } \).
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Kim, SH., Song, B. Thermodynamic aspects of steel reoxidation behavior by the ladle slag system of CaO-MgO-SiO2-Al2O3-Fe t O-MnO-P2O5 . Metall Mater Trans B 30, 435–442 (1999). https://doi.org/10.1007/s11663-999-0076-8
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DOI: https://doi.org/10.1007/s11663-999-0076-8