Abstract
The thermodynamics of managanese oxide and iron oxide and the phosphate capacity of CaO-SiO2-MnO-Fe t O-P2O5-MgOsat slags with high MnO contents relevant to the smelting of MnO ores in steelmaking were investigated. Previous data were limited to about 5 pct MnO, whereas in this study MnO contents up to 25 pct were studied. The activity of MnO showed positive deviation from ideal behavior and increased with basicity, while that of Fe t O decreased with basicity. This is reflected in that the manganese distribution ratio at a given Fe t O content decreases with basicity and high Mn in the metal is favored by high basicity. CaF2 additions up to 4 pct did not affect the activities of MnO and Fe t O. The activity coefficient of P2O5 decreases and the phosphate capacity increases with basicity. There was not adverse effect of high MnO contents on the dephosphorizing abilities of the slags.
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