As part of ongoing work to develop a low fuel consumption smelting process for comprehensive utilization of Hongge vanadium titanomagnetite (HVTM), the influence mechanism of SiO2 on the oxidation behavior and induration process of HVTM pellets (HVTMP) was investigated in this study. Results showed that as the amount of added SiO2 increased, the oxidation degree and compressive strength of HVTMP decreased rapidly while porosity increased. SiO2 had little effect on phase composition; however, it greatly influenced the microstructural evolution of HVTMP. Moreover, the Si-rich phases that precipitated at the grain boundary reduced grain migration, eventually suppressed grain growth, and affected the induration process. A schematic based on the experimental results was proposed to discuss the induration mechanism of HVTMP with different SiO2 additions. The results could provide theoretical and technical foundations for the comprehensive utilization of HVTM.

中文翻译：

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SiO2对红格钒钛磁铁矿球团氧化行为及硬化过程的影响机理

作为开发综合利用红格钒钛磁铁矿 (HVTM) 的低燃料消耗冶炼工艺正在进行的工作的一部分，本研究研究了 SiO2 对 HVTM 球团矿 (HVTMP) 氧化行为和硬化过程的影响机制。结果表明，随着SiO2添加量的增加，HVTMP的氧化程度和抗压强度迅速下降，孔隙率增加。SiO2对相组成影响不大；然而，它极大地影响了 HVTMP 的微观结构演变。此外，在晶界析出的富硅相减少了晶粒迁移，最终抑制了晶粒生长，并影响了硬化过程。提出了基于实验结果的示意图，以讨论具有不同 SiO2 添加量的 HVTMP 的固化机制。