Reevaluation and Measurements of FeₓO Activities in FeₓO–CaO–SiO₂ Pseudo-ternary System at 1573 K

Abstract

The knowledge of FeₓO activities in molten slags at lower temperatures is necessary for effective dephosphorization in hot metal pretreatments. However, there have been still differences among the reference data in the FeₓO–CaO–SiO₂ pseudo-ternary system at 1573 K. In the present study, the FeₓO activities were measured with an electrochemical technique in order to reevaluate the iso-activity curves of FeₓO. Subsequently, the CaO and SiO₂ activities along liquidus lines were calculated by the Gibbs-Duhem equation, and the equilibrium phosphorus contents in molten iron coeₓisted with dephosphorization slags were estimated by using the present results.