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Outline
To achieve the resource utilization of red mud, this work prepares FexOy/BaTiO3/C composite microwave absorbing materials using red mud as the iron source and soluble starch as the carbon source, employing sol-gel and solid-state reaction methods. First, a BaTiO3 precursor sol is obtained through the sol-gel process using titanium butoxide and barium acetate, which is then mixed uniformly with red mud and soluble starch. During the solid-state reaction, Fe2O3 in the red mud undergoes in situ carbothermic reduction to form Fe3O4 and Fe, which are evenly distributed within the composite, and the BaTiO3 exhibits a needle-like morphology. Experimental results show that by adjusting the solid-state reaction temperature and the raw material ratio, the phase composition, microstructure, and microwave absorption performance of the composites can be optimized. When the temperature is 700 ℃, RmBTS-700-1.2 exhibits a minimum reflection loss of −16.0 dB at a coating thickness of 2.0 mm, with an effective absorption bandwidth of 3.0 GHz. Meanwhile, RmBTS-700-1.8 achieves a minimum reflection loss of −32.6 dB at 10.7 GHz under the same coating thickness. The FexOy/BaTiO3/C composite microwave absorbing materials prepared in this study exhibit both strong dielectric loss and magnetic loss capabilities, providing a new approach for the comprehensive utilization of red mud and contributing to the realization of the carbon neutrality and carbon peak goals.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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