Fe3O4 and Fe loaded carbon matrix composite microwave absorbents by recycling of coal gasification residue
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摘要:
本研究以煤气化残渣作为碳基载体,通过湿化学浸渍法和焙烧处理制得不同磁性组分负载的复合吸波材料。结果表明,在焙烧过程中,主要发生缓慢的碳热还原反应,磁性组分物相由 Fe2O3、Fe3O4转变为 Fe,同时碳热还原反应消耗掉一部分活性较高的碳,复合材料的石墨化程度变差。由于良好的阻抗匹配与衰减特性,复合材料FeCGR1000体现出更佳的吸波性能,当涂层厚度为 2.0 mm时,最低反射损耗值为−25.3 dB,在涂层厚度为1.5 mm时,有效带宽达到4.0 GHz。本研究的开展不仅实现了煤气化残渣资源化利用,而且为煤气化残渣的高附加值应用提供新思路。
Abstract:In order to realize the effective resource utilization of coal gasification residues (CGR), the composite microwave absorbents loaded with different magnetic components were prepared through wet chemical impregnation and roasting progress, recycling of coal gasification residue as carbon-based carrier. The results showed that the main reaction involved in gradual carbothermal reduction reaction, during which the Fe2O3 and Fe3O4 were transformed into Fe. And part of high-activity carbon in CGR was consumed as well, which resulted in the poor graphitization degree of CGR composites. Benefitted from the better impedance matching and attenuation characteristic, FeCGR1000 displayed excellent microwave absorbing performance. The reflection loss value reached −25.3 dB under the coating thickness of 2.0 mm, and the effective bandwidth kept 4.0 GHz as the coating thickness remained 1.5 mm. This work not only benefitted for realizing the resource utilization of CGR, but also provided new ideas for the high additional value application for CGR.
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Key words:
- coal gasification residue /
- composite /
- microwave absorbents /
- resource utilization
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表 1 已报道材料的吸波性能
Table 1 Microwave absorption performance of some reported absorbents
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