Foamy slags are widely used in EAF steel production because the use of these slags result in energy savings, productivity improvements, and enhanced refractory service life. Foamy slag requires the control of slag viscosity to sustain gas bubbles during processing. This is accomplished through the precipitation of magnesium wustite particles in the slag at the operating temperature. A thermodynamic program, Factsage (trademark), was utilized to study the quaternary oxide system of MgO-CaO-FeO-SiO2, to predict the dual (saturated with CaO and MgO) and MgO saturated EAF slag chemistry under different oxygen partial pressures temperatures, and slag basicity. These predictions indicate a linear relationship between oxide components and slag basicity, from which an accurate prediction of the optimum slag chemistry can be made. The results of the Factsage (trademark) models will be compared to models developed by other researchers and experimental data.
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