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Nonisothermal Reduction Kinetics in the Fe-Cu-O System Using H2

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Abstract

The reduction of Fe and Cu oxides by H2 in the Fe-Cu-O system was investigated by thermogravimetric analysis. The results showed that the reduction process of Fe3O4 can be divided into two stages under nonisothermal conditions: When the temperature is less than 570°C, the reduction reaction is Fe3O4 → Fe; when the temperature is above 570°C, the reduction process is Fe3O4 → FeO → Fe. The fundamental aspects are discussed, as well as the effect of Cu and Cu2O on the reduction behavior of Fe3O4. The ease of reduction in the three systems decreases in the order Fe3O4-Cu > Fe3O4-Cu2O > Fe3O4. The reactions were conducted under nonisothermal conditions within two regimes, viz. less than and greater than 570°C. The combined activation energies corresponding to the reduction of Fe3O4-Cu, Fe3O4-Cu2O, and Fe3O4 within the two regimes were found to be 209 kJ mol−1, 257 kJ mol−1, and 442 kJ mol−1, respectively.

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Acknowledgements

Financial support for this study was provided by the National Natural Science Foundation of China (Nos. U1602272 and 51664039).

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Authors and Affiliations

  1. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, 650093, China

    Haipei Zhang, Bo Li, Yonggang Wei & Hua Wang

  2. Department of Materials Science and Engineering, University of Toronto, Toronto, M5S3E4, Canada

    Bo Li, Yindong Yang & Alexander Mclean

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  1. Haipei Zhang
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Correspondence to Bo Li.

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Zhang, H., Li, B., Wei, Y. et al. Nonisothermal Reduction Kinetics in the Fe-Cu-O System Using H2. JOM 71, 1813–1821 (2019). https://doi.org/10.1007/s11837-019-03402-1

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