期刊
MOLECULES
卷 27, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/molecules27123758
关键词
manganese ore powder (MOP); electromagnetic wave absorption; pollution control; dielectric loss
资金
- National Natural Science Foundation of China [61901073]
- China Postdoctoral Science Foundation [2021MD703936, 2021M693767]
- Innovation Research Group of Universities in Chongqing [CXQT20016]
- Cooperation Project between Undergraduate Universities in Chongqing and Institutions Affiliated to the Chinese Academy of Sciences [HZ2021018]
The electromagnetic wave absorption performance of manganese ore powder (MOP) building materials has been studied, showing excellent microwave absorption properties. MOP can be used to address electromagnetic protection needs of important ground buildings and the harmful effects of manganese residue on the environment.
Considering the electromagnetic protection needs of important ground buildings, exploring the electromagnetic wave (EMW) absorption performance of manganese ore powder (MOP) building materials is an effective way to overcome its low added value and difficulty in popularizing. Here, choosing filling ratios commonly used in building materials such as autoclaved bricks, MOP/paraffin samples with 20%, 40%, and 60% mass fraction of MOP were prepared, and electromagnetic properties were analyzed at 2-18 GHz using the coaxial method. The results show that 60 wt% sample has the best absorption performance, with a minimum reflection loss (RLmin) value of -22.06 dB at 15.04 GHz, and the effective absorption bandwidth (EAB, RL < -10 dB) reaches 4.16 GHz at a 7.65 mm absorber thickness, covering most of the Ku-band region. The excellent microwave absorption performance of MOP is due to its multi-oxide forming multi-interface structure and rough surface, which can not only form abundant dipole and interfacial polarization under the action of EMW, but also reflect and scatter the incident EMW, prolong the transmission path, and enhanced the absorption of microwaves. This study demonstrates that MOP building materials can have excellent microwave absorption properties, thus becoming a new way to address harmful manganese residue; for example, autoclaved bricks, which can not only improve the added value of manganese residue building materials but also can be consumed on a large scale. It provides a new idea to solve the harm of manganese residue.
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