Journal Article

Role of iron ore in enhancing gasification of iron coke: Structural evolution, influence mechanism and kinetic analysis

Zheng, Heng, Hao, Qiuyue, Wang, Wei, Bao, Junfang, Xu, Runsheng, Chen, Xuheng, Wang, Jie

2025

Overview

The utilization of iron coke provides a green pathway for low-carbon ironmaking. To uncover the influence mechanism of iron ore on the behavior and kinetics of iron coke gasification, the effect of iron ore on the microstructure of iron coke was investigated. Furthermore, a comparative study of the gasification reactions between iron coke and coke was conducted through non-isothermal thermogravimetric method. The findings indicate that compared to coke, iron coke exhibits an augmentation in micropores and specific surface area, and the micropores further extend and interconnect. This provides more adsorption sites for CO 2 molecules during the gasification process, resulting in a reduction in the initial gasification temperature of iron coke. Accelerating the heating rate in non-isothermal gasification can enhance the reactivity of iron coke. The metallic iron reduced from iron ore is embedded in the carbon matrix, reducing the orderliness of the carbon structure, which is primarily responsible for the heightened reactivity of the carbon atoms. The kinetic study indicates that the random pore model can effectively represent the gasification process of iron coke due to its rich pore structure. Moreover, as the proportion of iron ore increases, the activation energy for the carbon gasification gradually decreases, from 246.2 kJ/mol for coke to 192.5 kJ/mol for iron coke 15wt%.

• Publisher: University of Science and Technology Beijing,Springer Nature B.V,School of Chemistry and Materials Science,Hubei Engineering University,Xiaogan 432000,China,Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,China%Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,China%Institue of Ironmaking Technology,Baosteel Central Research Institute,Shanghai 201999,China%State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China
• Subject: Atomic structure / Carbon / Carbon dioxide / Ceramics / Characterization and Evaluation of Materials / Chemistry and Materials Science / Coke / Comparative studies / Composites / Corrosion and Coatings / Gasification / Glass / Heating rate / Iron compounds / Iron ores / Ironmaking / Materials Science / Metallic Materials / Molecular structure / Natural Materials / Random pore model / Research Article / Surfaces and Interfaces / Thin Films / Tribology