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 oxidation induration mechanism of VTM pellets was discussed by combining the experimental and characterization results. These findings can provide theoretical support for the utilization of VTM.

为了了解钒钛磁铁矿 (VTM) 球团的非等温氧化硬化机制，本研究调查了抗压强度、孔隙率、相组成和形态的变化。发现在非等温氧化硬化过程中，VTM球团的抗压强度逐渐增加；然而，孔隙率表现出相反的趋势。有价元素的相变可描述为：Fe ₃ O ₄  → Fe ₂ O ₃；FeTiO ₃  → Fe ₂ TiO ₄  → Fe ₂ Ti ₃ O ₉  → Fe ₂ TiO ₅；和铁₂ VO ₄  → V ₂ O ₃。随着硬化温度的升高，孔隙数量减少，赤铁矿晶粒尺寸增大。结合实验和表征结果讨论了VTM颗粒的非等温氧化硬化机理。这些发现可以为 VTM 的利用提供理论支持。