| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Drying, Roasting, Calcining and Agglomeration of Feedstocks
|
| Presentation Title |
Effect of MgO on the Oxidation Kinetics of Magnetite |
| Author(s) |
Zijian Su, Qijie Guo, Fang Chen, Nanyong Wu, Yuanbo Zhang, Xiaoguang Bai, Guowei Fu |
| On-Site Speaker (Planned) |
Qijie Guo |
| Abstract Scope |
MgO-fluxed pellets are widely used in blast furnace ironmaking due to their excellent metallurgical properties. However, MgO-fluxed pellets require high roasting temperature control. A roasting temperature that is too low may not allow for adequate consolidation, while a temperature that is too high may lead to the bonding of the pellets and affect the quality of the pellets. This study used magnetite pure mineral and MgO reagents to study the effect of different Mg/Fe molar ratios on the phase transformation of roasted products. The diffusion rate of Mg2+ at the reaction interface of the Fe3O4-MgO system under different atmosphere conditions is investigated. The results showed that the higher Mg/Fe ratio is favorable for generating MgxFe3-xO4, and the presence of Mg2+ will hinder the Fe2O3 grain connection. It is unfavorable to the Fe2O3 grain growth. At 1200℃, the diffusion rate of Mg2+ at the interface of the Fe3O4-MgO system in a nitrogen atmosphere was faster than that in an air atmosphere. |
| Proceedings Inclusion? |
Planned: |