Preparation and Characterization of CaO-Al2O3-SiO2 Glass–Ceramic Microspheres from Coal-Based Solid Waste

To alleviate the environmental pollution caused by the stockpile of coal-based solid waste, glass–ceramic microspheres prepared by a simple and low-cost wet process with coal-based solid waste, and the effect of different solid waste content on the network structure and properties were investigated by X-ray diffraction (XRD), Fourier infrared spectroscopy (FTIR), Scanning electron microscopy (SEM) and Universal electronic testing machine. The results show that, with the diversification of coal-based solid waste content, the amount of anorthite crystalline, the glass network structure, and the main structure of glass Q³ changed also. Accordingly, significant changes have occurred in the properties of the crushing strength. Optimizing the raw material ratio, a coal-based solid waste glass–ceramic microsphere with unique network structure is well developed and the crushing strength reaches the maximum value of 221.23 N. The findings contribute significantly to improving the properties of matrix materials and the utilization of coal-based solid waste resources.