School of Automation, Chongqing University of Posts and Telecommunications, Chongqing 400065, China.
China Academy of Space Technology (Xi'an), Institute of Space Antenna, Xi'an 710100, China.
Molecules. 2022 Jun 10;27(12):3758. doi: 10.3390/molecules27123758.
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.
考虑到重要地面建筑物的电磁防护需求，探索锰矿粉（MOP）建筑材料的电磁波（EMW）吸收性能是克服其附加值低和推广困难的有效途径。在这里，选择蒸压砖等建筑材料中常用的填充比，制备了 MOP/石蜡质量分数为 20%、40%和 60%的 MOP 样品，并采用同轴法在 2-18GHz 范围内分析了电磁性能。结果表明，60wt%的样品具有最佳的吸收性能，在 15.04GHz 时的最小反射损耗（RLmin）值为-22.06dB，在 7.65mm 吸收体厚度下，有效吸收带宽（EAB，RL<−10dB）达到 4.16GHz，覆盖了大部分 Ku 波段。MOP 优异的微波吸收性能归因于其多氧化物形成的多界面结构和粗糙表面，这不仅可以在 EMW 的作用下形成丰富的偶极子和界面极化，还可以反射和散射入射的 EMW，延长传输路径，增强微波吸收。本研究表明，MOP 建筑材料可以具有优异的微波吸收性能，从而成为解决有害锰渣的新途径；例如，蒸压砖不仅可以提高锰渣建筑材料的附加值，还可以大规模消耗。为解决锰渣危害提供了新思路。
