Mixing Characteristics of Additives in Viscous Liquid BOF Slag

The mixing behavior of compositional modifiers into viscous liquid BOF slag was studied using fluid flow modeling under industrially relevant conditions. The Volume of Fluid-Large Eddy Simulation-Discrete Phase Model was used to simulate the gas-solid particle-liquid slag turbulent flow. The area fraction of the particle migration zone was calculated to quantify the mixing process. The results show that increasing gas flow rate and/or depth of lance submergence can shrink the quiescent region at the bottom of the slag pot, shortening the mixing process. Influence of the lance submergence depth is more significant on the particle mixing process. The input energy flux can be used as a measure to quantitatively evaluate the mixing behavior. Additionally, it was confirmed that increasing the slag viscosity prolongs the mixing process. Particle size in the range that was studied has little influence on the particle migration.