Chai Yifan, Fan Yingjie, Li Zhichao, Wu Jiayi, Zhang Yunhao, Wang Yici, Luo Guoping, An Shengli
School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia Autonomous Region, China.
ACS Omega. 2022 Feb 27;7(9):7759-7768. doi: 10.1021/acsomega.1c06563. eCollection 2022 Mar 8.
To explore the reduction swelling process of pellets prepared from the Bayan Obo iron ore concentrate, based on the iron oxide reduction theory of pellets, the reduction of pellets prepared from the Bayan Obo iron ore concentrate was analyzed by thermogravimetric experiments and kinetic calculations in three stages. The reason for the abnormal swelling of pellets prepared from the Bayan Obo iron ore concentrate was analyzed from the perspective of kinetics. The research results showed that carbon deposition occurred in the first stage of reduction. The second stage of reduction was controlled by an interfacial chemical reaction, and the activation energy of the reaction was 117.99 kJ/mol. The reaction energy barrier was higher and the reaction rate was slower, and therefore, the reduction swelling rate of pellets was lower at this stage. The third stage of reduction was controlled by internal diffusion, and the reaction activation energy was 15.9 kJ/mol. The reduction reaction of pellets occurs violently, and the reduction swelling behavior was remarkable at this stage.
为探究白云鄂博铁精矿制备球团的还原膨胀过程，基于球团的氧化铁还原理论，通过热重实验和动力学计算分三个阶段分析了白云鄂博铁精矿制备球团的还原过程。从动力学角度分析了白云鄂博铁精矿制备球团异常膨胀的原因。研究结果表明，还原第一阶段发生了积碳现象。还原第二阶段受界面化学反应控制，反应活化能为117.99 kJ/mol。该反应的能量势垒较高，反应速率较慢，因此，此阶段球团的还原膨胀率较低。还原第三阶段受内扩散控制，反应活化能为15.9 kJ/mol。球团的还原反应剧烈，此阶段还原膨胀行为显著。
