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The effects of dynamic oxidations on the crystal morphology and the precipitation behavior of the perovskite phase from Ti-bearing blast furnace slag were investigated. Air was blown into the molten slag as an oxygen source through a lance during the dynamic oxidation process. It was found that the dispersed Ti components were selectively taken into the perovskite phase (CaTiO3), and the perovskite phase could be selectively precipitated and grown. Oxidation of molten slag produced a large amount of heat, which not only increased the temperature of the slag, but also promoted the precipitation and growth of the perovskite phase. It was confirmed by isothermal experiments and non-isothermal pilot experiments that the precipitation of the perovskite (CaTiO3) in molten slag is obviously affected by operation factors such as oxidizing time, and slag temperature. The perovskite phase precipitation kinetics and mechanisms from molten slag during the dynamic oxidation processes were also investigated.

The effects of the dynamic oxidation on the viscosity of Ti-bearing blast furnace slag, on a selective enrichment, a precipitation and a growth of the Ti component were studied. The oxygen source was the air that was blown into the molten slag through a lance during the dynamic oxidation process. It was found that the oxidation of TiC, metallic Fe, TiO and Ti 2 O 3 in the slag was not only in favor of the decrease of the viscosity of the slag, but also for the selective enrichment of the Ti component into the perovskite phase as well as the precipitation and growth of the perovskite phase. As oxidation time increases, the precipitation and growth of the perovskite phase rapidly increased, and the slag changed from the melt to a mixture of the melt and crystalline phase(s), that caused the viscosity of the oxidized slag for 12 min increased rapidly.