Abstract Scope |
Vanadium titano-magnetite has become an increasingly important iron ore resources in the world. While the strength and reducibility of iron sinter for blast furnace ironmaking became worse when the vanadium titano-magnetite was introduced. In this study, the formation behavior of calcium ferrite containing TiO2 in sintering of iron ore fines was investigated through the reaction experiments and TG-DSC methods. Based on the experiment results, it was found when the TiO2 was introduced into CaO-Fe2O3 system, a calcium ferrite containing TiO2 was formed, where the chemical composition and melting point of this calcium ferrite could be confirmed as Ca3TiFe2O8 and 1353℃. Furthermore, the formation mechanism of Ca3TiFe2O8 was realized, where the CaO was firstly reacted with TiO2 or Fe2O3 to form CaTiO3 and Ca2Fe2O5, and then the CaTiO3 and Ca2Fe2O5 reacted to form Ca3TiFe2O8. The results were beneficial for promotion the liquid phase formation in iron sinter containing TiO2. |