Action rules of H2 and CO in gas-based direct reduction of iron ore pellets

The gas-based direct reduction of iron ore pellets was carried out by simulating the typical gas composition in coal gasification process, Midrex and Hyl-III processes. The influences of gas composition and temperature on reduction were studied. Results show that the increasing of H 2 proportion is...

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Bibliographic Details
Published in:Journal of Central South University 2012-08, Vol.19 (8), p.2291-2296
Main Authors: Yi, Ling-yun, Huang, Zhu-cheng, Peng, Hu, Jiang, Tao
Format: Article
Language:English
Subjects:
Engineering
Metallic Materials
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Summary:The gas-based direct reduction of iron ore pellets was carried out by simulating the typical gas composition in coal gasification process, Midrex and Hyl-III processes. The influences of gas composition and temperature on reduction were studied. Results show that the increasing of H 2 proportion is helpful to improve the reduction rate. However, when φ (H 2 ): φ (CO)>1.6:1, changes of H 2 content have little influence on it. Appropriate reduction temperature is about 950 °C, and higher temperature (1 000 °C) may unfavorably slow the reduction rate. From the kinetics analysis at 950 °C, the most part of reduction course is likely controlled by interfacial chemical reaction mechanism and in the final stage controlled by a combined effect of gaseous diffusion and interfacial chemical reaction mechanisms. From the utilizations study of different reducing gases at 950 °C, the key step in reduction course is the 3rd stage (FeO→Fe), and the utilization of reducing gas increases with the rise of H 2 proportion.
ISSN:2095-2899
2227-5223
DOI:10.1007/s11771-012-1274-0