Influence of Blast Furnace Burden with Different TiO₂ Contents on the Process of Reduction and Slag Formation in Cohesive Zone

抄録

Vanadium and titanium magnetite (VTM) possesses considerable value in comprehensive mining and utilization. The varying TiO₂ content in the blast furnace burden during smelting directly influences the formation, location, thickness, permeability, and heat exchange within the cohesive zone of the blast furnace. This paper employs the ‘Qisunny method’ to simulate the reduction droplet of blast furnace burden under the condition of different TiO₂ content in the theoretical composition of blast furnace hearth slag, and systematically researches the change rule of soft-melting and dripping performance of blast furnace burden. It systematically investigates the factors influencing the soft-melting and dripping performance of the blast furnace burden. The results indicate that, as the TiO₂ content in the theoretical composition of blast furnace final slag increases from 7.5 wt% to 25.5 wt%, several changes occur: the softening zone (ΔT_s) widens, while the melting zone (ΔT_m) narrows. Additionally, the temperature range of the cohesive zone (ΔT_c) experiences a slight widening, and the cohesive tends to shift downward. The reduction of iron oxides in the blast furnace burden occurs primarily in the softening zone, whereas the reduction of titanium oxides begins in the melting zone. Furthermore, the simulated operation line gradually deviates from the ideal operation line, necessitating an increase in airflow and coke ratio for optimal performance in the actual operation of the blast furnace.