Thermodynamic Assessment of Liquid Mn–Fe–Si–C–Ca–P System by Unified Interaction Parameter Model

抄録

The Unified Interaction Parameter Model was used to evaluate the thermodynamics of Mn–Fe–Si–C–Ca–P system. The calculated results of the activities and activity coefficients of different components as well as the solubility of C and Ca agree well with the experimental data in binary, ternary and quaternary system. These parameters could be applied to calculate the activities of Mn, Si, Fe, C, Ca and P and the equilibrium between Ca and P in carbon saturated Mn–Fe–Si–C–Ca–P melts during the dephosphorization process. They are also useful for understanding the process of ferromanganese and silicomanganese. Using the present UIPM parameters, the calculated results showed that temperature had a weak effect on the activity coefficient of manganese in Mn–C melt. The effect of temperature and Fe content on the carbon solubility in Mn–Fe melts could be expressed as: X_Csat=(−229.18/T+0.411)+(−186.54/T+0.014)X_Fe. Manganese activity monotonically decreased as the silicon content increased and slightly decreased as the temperature increased in the carbon saturated Mn–Si–C system.