Thermodynamic aspects of steel reoxidation behavior by the ladle slag system of CaO-MgO-SiO2-Al2O3-Fe
t
O-MnO-P2O5 |
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Authors: | Seon-Hyo Kim Bo Song |
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Affiliation: | (1) the Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Kyungbuk, Korea |
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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
and γ
MnO showed minima with respect to P2O5 content of slag. In addition, the values of
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,
. For Al2O3 saturated slags,
. |
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Keywords: | |
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