Preparation and Microwave Absorbing Properties of Double-layer Fine Iron Tailings Cementitious Materials

Abstract

To develop the microwave absorbing (MA) properties of cementitious material mixed with mine solid waste, the iron tailings cementitious microwave absorbing materials were prepared. The iron tailings was treated into different particle sizes by planetary ball mill, and the physicochemical properties of iron tailings were tested by laser particle size analyzer and scanning electron microscope (SEM). The electromagnetic parameters of iron tailings cementitious materials were characterized by a vector network analyzer and simulated MA properties, and the MA properties of iron tailings-cement composite system with steel fiber as absorber was studied. Based on the design of the single-layer structure, optimum mix ratio and thickness configuration method of double-layer structure were further studied, meanwhile, the mechanical properties and engineering application were analyzed and discussed. The results show that the particle size of iron tailings can affect its electromagnetic behavior in cementitious materials, and the smaller particles lead the increase of demagnetisation effect induced by domain wall motion and achieve better microwave absorbing properties in cementitious materials. When the thickness of matching layer and absorbing layer is 5 mm, the optimized microwave absorbing properties of C1/C3 double-layer cementitious material can obtain optimal RL value of −27.61 dB and effective absorbing bandwidth of 0.97 GHz, which attributes to the synergistic effect of impedance matching and attenuation characteristics. The double-layer microwave absorbing materials obtain excellent absorbing properties and show great design flexibility and diversity, which can be used as a suitable candidate for the preparation of favorable microwave absorbing cementitious materials.

Keywords

microwave absorbing properties / iron tailings / electromagnetic parameters / single-layer structure / double-layer structure / impedance matching

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