Coke Combustion Rate with the Presence of Hematite in Quasi-particles

• Published in: ISIJ International Vol. 61; no. 12; pp. 2964 - 2970
• Main Authors: Wang, Ziming, Tsutsumi, Shunsuke, Maeda, Takayuki, Ohno, Ko-ichiro, Kunitomo, Kazuya
• Format: Journal Article
• Language: English
• Published: The Iron and Steel Institute of Japan 15.12.2021
• Subjects: coke combustion rate; effective diffusion coefficient; iron ore sintering process; reaction rate constant; unreacted-core model
• ISSN: 0915-1559; 1347-5460
• DOI: 10.2355/isijinternational.ISIJINT-2021-214

The coke combustion rate in the iron ore sintering process is one of the most important factors affecting the quality and productivity of iron ore sintering. The purpose of this study was to investigate the combustion rate of coke in the presence of hematite to simulate the actual conditions in a sinter machine. The experimental samples were prepared by mixing coke powder with hematite powder. Experiments were carried out under an air or N2 atmospheres at 1073, 1173 and 1273 K. From the results of the reaction curves, the coke combustion rates were analyzed using an unreacted-core model with one reaction interface.From the kinetic analysis, it was found that the reaction rate constant kc (m/s) and effective diffusion coefficient De (m2/s) of the sample were both affected by the experimental temperature. Furthermore, the De value of the sample was affected by the amount of coke. However, the kc of the sample was not affected by this.