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Recycling and utilization of coal gasification residues for fabricating Fe/C composites as novel microwave absorbents

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Abstract

Under the background of a transformation of the global energy structure, coal gasification technology has a wide application prospect, but its by-product, the coal gasification residue (CGR), is still not being efficiently utilized for recycling. The CGR contains abundant carbon components, which could be applied to the microwave absorption field as the carbon matrix. In this study, Fe/CGR composites are fabricated via a two-step method, including the impregnation of Fe3+ and the reduction process. The influence of the different loading capacities of the Fe component on the morphology and electromagnetic properties is studied. Moreover, the loading content of Fe and the surface morphology of the Fe/CGR can be reasonably controlled by adjusting the concentration of the ferric nitrate solution. Meanwhile, Fe particles are evenly inserted on the CGR framework, which expands the Fe/CGR interfaces to enhance interfacial polarization, thus further improving the microwave-absorbing (MA) properties of composites. Particularly, as the Fe3+ concentration is 1.0 mol/L, the Fe/CGR composite exhibits outstanding performance. The reflection loss reaches −39.3 dB at 2.5 mm, and the absorption bandwidth covers 4.1 GHz at 1.5 mm. In this study, facile processability, resource recycling, appropriately matched impedance, and excellent MA performance are achieved. Finally, the Fe/CGR composites not only enhance the recycling of the CGR but also pioneer a new path for the synthesis of excellent absorbents.

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Acknowledgements

This work was supported by the National Nature Science Foundation of China (No. 51802212), the National College Students’ Innovation and Entrepreneurship Training Program (No. 2021465), the Natural Science Foundation of Shanxi Province, China (No. 201801D221119), the Open Foundation of China-Belarus Belt and Road Joint Laboratory on Electromagnetic Environment Effect (Nos. ZBKF2022030802 and ZBKF2022030702), and the Graduate Education Innovation Programs of Taiyuan University of Science and Technology (No. XCX212003).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, China

    Guomin Li, Xiaojie Xue, Lutao Mao, Yake Wang, Lingxiao Li, Kewei Zhang & Liping Liang

  2. Key Laboratory of Advanced Materials of Tropical Island Resources of Ministry of Education, Hainan University, Haikou, 570228, China

    Guizhen Wang

  3. State Key Laboratory for Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, China

    Rong Zhang

  4. China-Belarus Belt and Road Joint Laboratory on Electromagnetic Environment Effect, Taiyuan, 030032, China

    Yuexiang Wang

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  1. Guomin Li
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  2. Xiaojie Xue
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Correspondence to Guomin Li or Guizhen Wang.

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Li, G., Xue, X., Mao, L. et al. Recycling and utilization of coal gasification residues for fabricating Fe/C composites as novel microwave absorbents. Int J Miner Metall Mater 30, 591–599 (2023). https://doi.org/10.1007/s12613-022-2534-0

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  • DOI: https://doi.org/10.1007/s12613-022-2534-0

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