The Prediction of Gas Residence Times in Foaming CaO-SiO2-FeO Slags.

  • Ghag Surinder S.
    RGC Mineral Sands
  • Hayes Peter C.
    Department of Mining, Minerals and Materials Engineering, The University of Queensland
  • Lee Hae-Geon
    Department of Materials Science and Metallurgical Engineering, Pohang University of Science and Technology

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A dynamic, non-equilibrium model of foaming:<br><br>Σ=1×106((pg)2d3 μ·Eeff)<br><br>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.<br> 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.

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