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Reduction Behavior of CaO–Fe2O3–8 wt%SiO2 System at 1123, 1173 and 1223 K with CO–N2 Gas Mixtures

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Applications of Process Engineering Principles in Materials Processing, Energy and Environmental Technologies

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

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Abstract

The influence of SiO2 on the reducibility of the CaO–Fe2O3–SiO2 system was fully examined in this study. The isothermal reduction kinetics of CF and CF8S (CaO/Fe2O3 = 1:1, wt% (SiO2) = 8) were investigated through thermogravimetric analysis at 1123, 1173, and 1223 K with 30% CO and 70% N2 gas mixtures. The reduction of the samples with 8% SiO2 was not only highly accelerated but also proceeded easily. Rate analysis revealed that CF and CF8S reduction occurs in two stages, the Fe3O4-to-FeO stage overlaps with the previous Fe2O3-to-Fe3O4 stage and tends to approach the following FeO-to-Fe stage with the addition of SiO2. The apparent activation energy values of CF and CF8S reduction are 46.89 and 8.71 kJ mol−1. Sharp analysis indicated that CF and CF8S reduction was expressed by the Avrami–Erofeev equation presenting a 2D shrinking layer reaction.

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Acknowledgements

The authors are grateful for the financial support provided by the Natural Science Foundation of China (51544203).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

    Chengyi Ding, Xuewei Lv, Kai Tang, Senwei Xuan, Yun Chen & Jie Qiu

Authors
  1. Chengyi Ding
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  2. Xuewei Lv
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  3. Kai Tang
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  4. Senwei Xuan
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  5. Yun Chen
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  6. Jie Qiu
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Corresponding author

Correspondence to Xuewei Lv .

Editor information

Editors and Affiliations

  1. Rio Tinto Kennecott Utah Copper , Magna, Utah, USA

    Shijie Wang

  2. University of Utah , Salt Lake City, Utah, USA

    Michael L Free

  3. The University of Saskatchewan , Saskatoon, Saskatchewan, Canada

    Shafiq Alam

  4. ArcelorMittal Global R&D , Schereville, Indiana, USA

    Mingming Zhang

  5. Colorado School of Mines, George S. Ansell Chair Colorado School of Mines, Golden, Colorado, USA

    Patrick R. Taylor

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Ding, C., Lv, X., Tang, K., Xuan, S., Chen, Y., Qiu, J. (2017). Reduction Behavior of CaO–Fe2O3–8 wt%SiO2 System at 1123, 1173 and 1223 K with CO–N2 Gas Mixtures. In: Wang, S., Free, M., Alam, S., Zhang, M., Taylor, P. (eds) Applications of Process Engineering Principles in Materials Processing, Energy and Environmental Technologies. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-51091-0_49

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