Non-isothermal oxidation induration mechanism of vanadium titanomagnetite pellets

To understand the non-isothermal oxidation induration mechanism of vanadium titanomagnetite (VTM) pellets, change of compressive strength, porosity, phase composition, and morphology were investigated in this study. It was found that the compressive strength of VTM pellets gradually increased under non-isothermal oxidation induration process; however, the porosity showed an opposite trend. The phase transformations of valuable elements could be described as follows: Fe3O4-. Fe2O3; FeTiO3-. Fe2TiO4-. Fe2Ti3O9-. Fe2TiO5; and Fe2VO4-. V2O3. The number of pores decreased and the size of hematite grains increased with the increase of induration temperature. The non-isothermal oxida-tion induration mechanism of VTM pellets was discussed by combining the experimental and character-ization results. These findings can provide theoretical support for the utilization of VTM.& COPY; 2023 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.

Automated summary

This study investigates the non-isothermal oxidation induration mechanism of vanadium titanomagnetite (VTM) pellets by examining changes in compressive strength, porosity, phase composition, and morphology. The results show that the compressive strength of VTM pellets increases gradually during the non-isothermal oxidation induration process, while the porosity exhibits an opposite trend. The phase transformations of valuable elements include Fe3O4 → Fe2O3, FeTiO3 → Fe2TiO4 → Fe2Ti3O9 → Fe2TiO5, and Fe2VO4 → V2O3. The number of pores decreases and the size of hematite grains increases with the increase of induration temperature. The non-isothermal oxidation induration mechanism of VTM pellets is discussed based on experimental and characterization results. These findings provide theoretical support for the utilization of VTM.