Coalescence,growth and settling of metallic Fe droplets in molten Ti-bearing blast furnace slag under dynamic oxidation condition

To explore the coalescence, growth and settling behavior of metallic Fe droplets under the dynamic oxidation condition, the effects of oxidation time, air stirring intensity and pure oxygen oxidizing on the coalescence of metallic Fe were investigated in this paper. The changes in temperature and viscosity of the molten slag were studied during the dynamic oxidation process, and the settling speed of metallic Fe was calculated. It is indicated by lab and 1200 kg pilot-scale experiments that low valence titanium is oxidized by blowing the oxidizing gas. As the temperature increases, the viscosity of the slag decreases, which accelerates the coalescence, growth and settling of metallic Fe droplets. With a longer oxidizing time, low valence titanium and (FeO) finally almost vanish, and metallic Fe droplets are oxidized, resulting in the decrease of metallic Fe recovery. The judgment of the oxidation end point depends on the (FeO) and low valence titanium content.