Thermodynamic Assessment of Maganese Distribution in Hot Metal and Steel

Abstract

The manganese distribution ratios between CaO-SiO₂-Fe_tO-P₂O₅ (≤0.9 mass%)-MnO (8-16 mass%) slags and liquid iron were determined at 1873 K in a MgO crucible. The activity coefficient of MnO and the values for k'_Mn=(mass%MnO)/{[mass%Mn]·(mass%T.Fe)} and C_Mn=(mass%MnO)/{a_Mn·a_O} were formulated as functions of slag composition and temperature. By using these formulas, the manganese distribution ratios at 1623 and 1923 K were estimated as functions of total Fe content and (mass%CaO)/(mass%SiO₂) ratio. The manganese contents in hot metal and steel were also estimated as functions of manganese distribution ratio, slag volume and amount of manganese ore by using the mass balance relation.