Activity of the Constituents in Fe<SUB><I>t</I></SUB>O-SiO<SUB>2</SUB>-MnO Slags in Equilibrium with Solid Iron

Abstract

Measurements have been made of the equilibrium between H2O/H2 gas mixtures and FetO-SiO2-MnO melts contained in Fe crucible at 1450°C. The influence of slag composition on the activity of iron oxide and the Fe3+/Fe2+ratio has been determined. It has been confirmed that the results can be expressed in terms of LUMSDEN'S regular solution model over wide ranges of composition in the system FetO-SiO2-MnO except for SiO2 saturation and FeO rich region. The iso-activity lines for each component for these slags in equilibrium with liquid iron at 1600°C have been calculated using the regular solution model.