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Kinetic analysis of iron ore powder reaction with hydrogen—carbon monoxide
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Journal Article
Kinetic analysis of iron ore powder reaction with hydrogen—carbon monoxide
2022
Overview
Iron ore powder was isothermally reduced at 1023–1373K with hydrogen/carbon monoxide gas mixture (from 0vol%H
2
/100vol%CO to 100vol%H
2
/0vol%CO). Results indicated that the whole reduction process could be divided into two parts that proceed in series. The first part represents a double-step reduction (Fe
2
O
3
→Fe
3
O
4
→FeO), in which the kinetic condition is more feasible compared with that in the second part representing a single-step reduction (FeO→Fe). The influence of hydrogen partial pressure on the reduction rate gradually increases as the reaction proceeds. The average reduction rate of hematite ore with pure hydrogen is about three and four times higher than that with pure carbon monoxide at 1173 and 1373 K, respectively. In addition, the logarithm of the average rate is linear to the composition of the gas mixture. Hydrogen can prominently promote carbon deposition to about 30% at 1023 K. The apparent activation energy of the reduction stage increases from about 35.0 to 45.4 kJ/mol with the increase in hydrogen content from 20vol% to 100vol%. This finding reveals that the possible rate-controlling step at this stage is the combined gas diffusion and interfacial chemical reaction.
Publisher
University of Science and Technology Beijing,Springer Nature B.V,State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China%R&D,Tata Steel Ltd.,Jamshedpur,Jharkhand 831001,India%School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China
