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Reduction Behavior and Direct Reduction Kinetics of Red Mud-Biomass Composite Pellets

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Abstract

A large amount of red mud is discharged in the aluminum oxide production process, which contains a variety of valuable metals and is considered as a secondary resource. In order to reveal the mechanism of red mud carbon thermal reduction process, isothermal reduction experiments on carbon-bearing pellets of red mud were investigated with biomass carbon as a reducing agent. In this study, the reduction temperatures were conducted using a microwave stove in the temperature range from 850 to 1250 ℃, and the C/O molar ratio was 1.1. The results show that the reduction process of red mud is governed by a carbon gasification reaction, and the apparent activation energy is 88.44 kJ/mol. The optimum reduction process conditions were established to be 1150 ℃ for 13 min.

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Acknowledgements

Financial support of this project is provided by the National Key R & D Program of China (Grant NO. 2017YFC0703100)

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Authors and Affiliations

  1. Zhengzhou Non-ferrous Metal Research Institute Co. Ltd of CHALCO, Zhengzhou, 450041, China

    Shuai Li, Zeshuang Kang, Wanchao Liu, Yicheng Lian & Hongshan Yang

  2. National Engineering Research Center for Aluminum Metallurgy, Zhengzhou, 450041, China

    Shuai Li, Zeshuang Kang, Wanchao Liu, Yicheng Lian & Hongshan Yang

  3. Chinalco Environmental Protection and Energy Conservation Group Co. Ltd, Beijing, 101300, China

    Wanchao Liu

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  1. Shuai Li
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Correspondence to Shuai Li.

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The contributing editor for this article was Veena Sahajwalla.

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Li, S., Kang, Z., Liu, W. et al. Reduction Behavior and Direct Reduction Kinetics of Red Mud-Biomass Composite Pellets. J. Sustain. Metall. 7, 126–135 (2021). https://doi.org/10.1007/s40831-020-00326-y

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