Numerical Sumulation of Desulfurization Behavior in Gas-Stirred Ladles

A computation fluid dynamics—simultaneous reaction model (CFD-SRM) coupled model has been proposed to describe the desulfurization behavior in gas-stirred ladles. For the desulfurization thermodynamics, different models were investigated to determine sulfide capacity and oxygen activity, and for the desulfurization kinetics, the effects of bubbly plume flow as well as oxygen absorption and oxidation reactions in slag eyes were considered. The equilibrium of (Al2O3)-(FeO)-(SiO2)-(MnO)-[S]-[O] shows more reasonability for determining the interfacial oxygen activity, and the Young’s model with the thermodynamic coefficient of 1.5 is the best for determining the slag sulfide capacity. As the kinetics coefficient is 0.8, the predicted sulfur content changing with refining time agrees well with the measured, and the oxygen absorption and oxidation reactions in slag eyes have an important effect on desulfurization.