Fiber-Reinforced Coal Gangue-Based Alumina Aerogel Composites with Highly Thermal Stability by Ambient Pressure Drying

Kai Bo, Hongwei Liu, Yanlan Zhang and Yongzhen Wang ()
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Kai Bo: College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Hongwei Liu: College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Yanlan Zhang: College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Yongzhen Wang: College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Sustainability, 2024, vol. 16, issue 10, 1-14

Abstract: An aluminum silicate fiber/alumina aerogel (ASF/AA) composite was prepared via the sol-gel method and atmospheric drying (APD) method using coal gangue (CG) solid waste from Xingxian county, Shanxi Province, as the aluminum source. Utilizing N 2 adsorption, scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and thermal conductivity meters, researchers examined the microstructure, composition, pore structure, and thermal insulation performance of ASF/AA composites. The thermal conductivity mechanism of the composite was analyzed. The experimental results show that most of the aluminum in CG is used. More importantly, in the process of aerogel synthesis, the atmospheric pressure drying method is used to obtain similar properties to supercritical drying. The composite material exhibits a low thermal conductivity of 0.047 W/(m·K), a high specific surface area of 416 m 2 /g, and a low density of 0.26 g/cm 3 at room temperature. After heating at 1200 °C for 2 h, the thermal conductivity was as low as 0.071 W/(m·K). This strategy can not only effectively achieve a reduction in the harmfulness of solid waste coal gangue, but also alleviate the shortage of related energy and resources in our country.

Keywords: coal gangue; nanomaterials; Al 2 O 3 aerogel; atmospheric pressure drying; fiber reinforcement; thermal stability (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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