Abstract This study investigated the oxidation induration of Hongge vanadium titanomagnetite pellets (HVTMP) with different TiO2 additions, and its influence on subsequent reduction behavior with simulated shaft furnace gases. The results showed that the addition of TiO2 decreased the compressive strength and increased the porosity of the HVTMP, and eventually had a detrimental effect on the oxidation induration process. The oxidation induration mechanism was further elucidated by the means of XRD and SEM. When more TiO2 was added, the reduction degree and rate of the HVTMP decreased due to the generation of Fe2TiO5 during the oxidization induration process, which was unfavorable for the subsequent reduction process. The morphology structure confirmed that the growth of metallic iron whiskers was suppressed with an increase in TiO2, which resulted in the decrease of reduction swelling. Furthermore, the reduction swelling and compressive strength of the reduced HVTMP exhibited a reverse linear relationship. The current study not only provides experimental evidence to establish a correlation between TiO2 addition and oxidation reduction behavior, but also provides both a theoretical and technical basis for the effective utilization of Hongge vanadium titanomagnetite either in blast furnace or shaft furnace.

中文翻译：

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TiO 2 添加量对红格钒钛磁铁矿球团模拟竖炉煤气氧化固结和还原行为的影响

摘要 本研究研究了不同TiO2 添加量的红格钒钛磁铁矿球团(HVTMP) 的氧化硬度及其对模拟竖炉煤气后续还原行为的影响。结果表明，TiO2的加入降低了HVTMP的抗压强度并增加了孔隙率，最终对氧化硬化过程产生了不利影响。通过XRD和SEM进一步阐明了氧化硬化机理。当加入较多的 TiO2 时，由于在氧化硬化过程中生成 Fe2TiO5，HVTMP 的还原程度和还原率降低，不利于后续的还原过程。形貌结构证实，随着 TiO2 的增加，金属铁晶须的生长受到抑制，这导致还原膨胀的减少。此外，还原的 HVTMP 的还原溶胀和压缩强度表现出反向线性关系。本研究不仅为建立TiO2添加量与氧化还原行为之间的相关性提供了实验依据，而且为红格钒钛磁铁矿在高炉或竖炉中的有效利用提供了理论和技术依据。