The prediction of gas residence times in foaming CaO-SiO2-FeO slags

Abstract

A dynamic, non-equilibrium model of foaming: ∑ = 1 × 106(μ.Eeff/(ρg)2d3) which relates the residence times of gas bubbles in foams (∑) to the viscosity of the liquid phase (μ); the effective elasticity (Eeff) resulting from the dynamic adsorption of surface active species; the liquid phase density (ρ); and the mean bubble diameter (d); has been applied to foaming in the CaO-SiO2-FeO system at 1 823 K. In agreement with industrial observations, the model shows a transition from a foaming regime to a non-foammg regime as the slag basicity increase above 1.5. This is due to poor surface elasticity resulting from the negligible adsorption of silica in this region.