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Experimental and Numerical Simulation Study on Reduction of Pellets Based on X-ray Micro-computed Tomography

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Abstract

The direct reduction process of pellets in ironmaking promises to reduce carbon emissions significantly. This paper concerns the reduction behavior of hematite pellets in a hydrogen atmosphere at different temperatures. The evolution of the 3D structure of the pellet during the reduction process was investigated by the interrupted reduction method and the X-ray Micro-computed Tomography technique. The effects of different reduction temperatures on the pellet size and porosity during the reduction process were clarified, and it was concluded that higher reaction temperatures induced a dramatic evolution of the pellet structure. A modified unreacted shrinking core model was developed based on the experimentally obtained pellet structural evolution model. The modified calculations were in greater conformity with the experimental results than the unmodified ones. The model identified the influence of the structural evolution of the pellet during the reduction process on the reduction resistance per-step and emphasized the negative contribution of the product gas. While the current approach provides a solid foundation for dynamic modeling of the pellet reduction process, more efforts are necessary to accomplish a realistic process model.

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Acknowledgments

This work was supported by China Scholarship Council under Grant No. (202106890046), the National Natural Science Foundation of China under Grant No. (51974182), Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning under Grant No. (TP2015039), National 111 Project (The Program of Introducing Talents of Discipline to University), under Grant No. (D17002), Independent Research Project of State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of advanced Ferrometallurgy, Shanghai University (SKLASS 2022-Z01), the Science and Technology Commission of Shanghai Municipality, under Grant No. (19DZ2270200), and China Baowu Low Carbon Metallurgy Innovation Foudation-BWLCF202112. The authors thank Hao Nie and Yifan Xv for their help with the experimental work and English language editing.

Data Availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

Conflict of interest

The authors declare no conflict of interest.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, P.R. China

    Dejin Qiu, Shiyu Wei, Abdallah Ahmed Elsherbiny, Dengwei Zhang, Yuandong Xiong, Han Wei & Yaowei Yu

  2. Production and Mechanical Design Department, Faculty of Engineering, Mansoura University, Mansoura, 35516, Egypt

    Abdallah Ahmed Elsherbiny

  3. School of Metallurgy Engineering, Jiangsu University of Science and Technology, Zhangjiagang, 215600, P.R. China

    Han Wei

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  1. Dejin Qiu
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Qiu, D., Wei, S., Elsherbiny, A.A. et al. Experimental and Numerical Simulation Study on Reduction of Pellets Based on X-ray Micro-computed Tomography. Metall Mater Trans B 54, 3299–3311 (2023). https://doi.org/10.1007/s11663-023-02908-z

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