Abstract
The reduction kinetics of Hongge vanadium titanomagnetite (HVTM)-oxidized pellet with simulated gas compositions of dry pulverized coal gasification (DPCG), water-coal slurry gasification (WCSG), Midrex, and HYL-III is investigated in the current study. The experiments are carried out at temperatures ranging from 900 to 1050 °C, simulating the reduction zone in gas-based shaft furnace direct reduction processes. The reduction degree is the highest when reduced with the gas composition of HYL-III while the lowest when reduced with DPCG. The reduction degree, as well as the reaction rate constant and effective diffusion coefficient, is found to decrease in the order of HYL-III > Midrex > WCSG > DPCG. The reduction process is controlled by interfacial chemical reaction at initial stage and by both interfacial chemical reaction and internal diffusion at later stage. The scanning electron microscope (SEM) coupled with energy-dispersive spectroscopy (EDS) and X-ray diffraction (XRD) are used to estimate the reduction mechanism of HVTM-oxidized pellet with different gas compositions. This study aims to obtain scientific direction for reactor design and operational parameter determination of gas-based shaft furnace, as well as provide both theoretical and technical basis for the comprehensive utilization of HVTM.
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