Thermodynamic Assessment of Manganese Distribution in Hot Metal and Steel

Abstract

The manganese distribution ratios between CaO-SiO2-FetO-P2O5 (≤0.9mass%)-MnO (8-16mass%) 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 CMn = (mass%MnO)/{aMn-aO} 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. © 1995, The Iron and Steel Institute of Japan. All rights reserved.