The Prediction of Gas Residence Times in Foaming CaO–SiO2–FeO Slags
1998 Volume 38 Issue 11 Pages 1216-1224
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1998 Volume 38 Issue 11 Pages 1216-1224
A dynamic, non-equilibrium model of foaming:
Σ=1×106((pg)2d3 μ·Eeff)
which relates the residence times of gas bubbles in foams (Σ) 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 1823 K.
In agreement with industrial observations, the model shows a transition from a foaming regime to a non-foaming 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.
