|Cite this article as:|
|Jinge Feng, Jue Tang, Zichuan Zhao, Mansheng Chu, Aijun Zheng, Xiaobing Li, and Xiaoai Wang, Effect of TiO2 addition on the sticking of pellets based on hydrogen metallurgy shaft furnace: Behavior analysis and mechanism evolution, Int. J. Miner. Metall. Mater.,(2023). https://doi.org/10.1007/s12613-023-2730-6|
Direct reduction process based on the hydrogen metallurgy gas-based shaft furnace is a promising technology for efficiently and low-carbon smelt vanadium-titanium magnetite (VTM). However, in the direct reduction process, sticking of pellets occurs due to the aggregation of metallic iron between the contact surfaces of adjacent pellets, which will have a serious negative effect on the continuous operation. This paper presents a detailed experimental study of the effect of TiO2 on the sticking behavior of pellets during direct reduction process under different reduction conditions. The results showed that sticking index (SI) decreased linearly with increasing TiO2 addition, which stemmed from the increase of unreduced FeTiO3 during reduction, leading to decrease of the number and strength of metallic iron interconnections at the sticking interface. When the TiO2 addition was raised from 0% to 15% at 1100°C, SI increased from 0.71% to 59.91%. The connection of slag phase could be attributed to the sticking at low reduction temperature corresponding to low sticking strength. Moreover, interconnection of metallic iron became the dominant factor as reduction temperature increased, and SI increased sharply. Additionally, TiO2 had a great effect on SI at high reduction temperature compared to low reduction temperature.