Preparing high-strength titanium pellets for ironmaking as furnace protector: Optimum route for ilmenite oxidation and consolidation
2018
Gan, Min | Ji, Zhiyun | Fan, Xiaohui | Lv, Wei | Zheng, Ruyue | Chen, Xuling | Liu, Shu | Jiang, Tao
High-quality titanium pellets were prepared through applying the optimum path for ilmenite oxidization and consolidation in present investigation. The elucidated oxidization behaviors of ilmenite indicated that Fe2O3 and Fe2Ti3O9 were formed below 800 °C, and the process was controlled by interface chemical reactions. At 825 °C, Fe2O3 became the mainly formed mineral, while it could combine with TiO2 to form Fe2TiO5 if the oxidizing time was long enough. Increasing the temperature further considerably enhanced the percentage of Fe2TiO5. The effects of minerals formed during oxidation process on pellets consolidation indicated that the recrystallization of Fe2O3 in subsequent roasting process improved the mechanical strength of pellets, while Fe2TiO5 impaired pellets consolidation. The revealed optimum route was to improve the formation, enrichment and recrystallization of Fe2O3 at particle edge, and the recommended preheating parameters were 825 °C and 34 min, respectively. The strength of roasted pellets reached 2169 N/P (Newton per pellet), which can be used as the protector for blast furnace.
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