Direct extraction of perovskite CaTiO3 via efficient dissociation of silicates from synthetic Ti-bearing blast furnace slag

Abstract A new method of extract perovskite CaTiO 3 from synthetic Ti-bearing blast furnace slag (Ti-slag) is proposed. After thermal modification of Ti-slag with 30% NaNO 3 , the silicon containing components has been reconstructed, which can be more easily dissolved in the leaching process. The effect of composition, morphology and mineral phases of the silicon containing components on the direct migration into acid soluble silicates in minerals and solutions is illuminated. Furthermore, the leaching kinetics of the modified slag in a 10% hydrochloric acid solution was described by the shrinking core model (SCM). The apparent activation energy of the dissociation of “Si” was calculated to be about 17.23 kJ/mol, which indicates that the perovskite extraction is controlled both by interface transfer and solid product layer diffusion. The content of perovskite in the residue is 88.3% with 1.4% SiO 2 . The results of this study can provide an important method for direct extraction perovskite CaTiO 3 in the Ti-slag and also establish a new strategy for resources of complex high silicate minerals.