No abstract

High-quality oxidized pellets are the basis to achieve high-efficiency utilization of vanadium–titanium magnetite (VTM) ores. Bentonite was used as a binder of VTM. The main phase composition of VTM is titanomagnetite and ilmenite. When the amount of bentonite is 1%, the compressive strength and dropping strength of VTM pellets can meet the requirements. To improve metallurgical properties, the pellets need to be roasted. The best conditions for roasting are as follows: calcination temperature of 1523 K and a calcination time of 20 min. The consolidation mechanism, phase transformation, and crystal structure transformation of VTM in the process of oxidation roasting are also explained.

Vanadium-titanium magnetite (VTM) has a high comprehensive utilization value. The gas-based reduction process combined with the electric furnace melting process has the advantages of a high recovery rate of precious metal elements in VTM, low cost, high-energy efficiency, and low environmental pollution. Gasification gas provided by coal gasification technology is a potential reducing agent. Through FACTSAGE calculations and experiments, the reduction thermodynamic properties of VTM oxidized pellets by gasification gas were systematically studied to illustrate the feasibility of the system before practical experiments. The reaction mechanism of the direct reduction of VTM by gasification gas was proved, and the conversion behavior of iron and titanium in the reduction system was also clarified. This work clearly describes the reduction process of VTM oxidation pellets and clarifies the essence of the direct reduction of gas groups of VTM oxidized pellets.