Abstract
Low-temperature reduction of hematite to metallic iron by hydrogen is an essential process for ironmaking based on the blast furnace and non-blast furnace technologies. In this work, the reduction behaviors of Brazilian hematite in 20%H2–80%Ar at 400–570 °C were investigated in a micro-fluidized bed. Results indicate that the effect of the gaseous external diffusion can be eliminated as the gas flow rate reaches 400 mL/min at 500 °C. According to the conversion X, the reaction from hematite to metallic iron can be divided into two stages, which include the first stage that corresponds to the process of Fe2O3 → Fe3O4 with X < 1/9 and the second stage that corresponds to the reaction of Fe3O4 → Fe. During the reduction process, magnetite is formed gradually and a large number of pores and fissures are observed on the surface of the ore and peripheral part of the unreacted core of hematite. The rate constants of all individual reactions tend to increase with increasing temperature, and the reaction rate of the entire reduction process is suggested to be determined by the phase boundary reaction.
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Acknowledgements
The authors wish to acknowledge the Fundamental Research Funds for the Central Universities (No: 2018CDYJSY0055) and the National Natural Science Foundation of China (No. 51874056).
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He, K., Zheng, Z., Chen, H., Hao, W. (2021). Reduction Behaviors of Hematite to Metallic Iron by Hydrogen at Low Temperatures. In: Baba, A.A., Zhang, L., Guillen, D.P., Neelameggham, N.R., Peng, H., Zhong, Y. (eds) Energy Technology 2021. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-65257-9_11
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