MATHEMATICAL EXPRESSION OF SLAG METAL REACTIONS IN STEELMAKING PROCESS BY QUADRATIC FORMALISM BASED ON THE REGULAR SOLUTION MODEL

During the past three decades many theoretical treatments have been developed to predict the thermodynamic properties of silicate melts. In this paper, an attempt has been made to describe the slag-metal reactions in steelmaking process quantitatively by the relation of quadratic formalism based on the regular solution model. The approximate validity of the model was quite satisfactory to formulate the reactions of the oxygen distribution, the ferrous-ferric iron equilibrium, the manganese distribution, the phosphorus distribution and the hydroxyl capacity. The prediction of activities of components in Fe(t)O-CaO-SiO2 and Fe(t)O-MnO-SiO2 ternaries are also in good agreement with the measurements.