Research Progress on the Utilization of Coal Gangue for Ceramsite Production

Abstract

Coal gangue, as the industrial solid waste with the largest discharge and stockpile volume in China, has seen its resource utilization become a critical issue in promoting the green development of the coal industry. This paper systematically reviews the technical principles, process methods, product characteristics, and application prospects of producing ceramsite from coal gangue. It provides an in-depth analysis of the potential of coal gangue for ceramsite production and offers a detailed comparison of the technical features of different preparation processes. Research indicates that the chemical composition of coal gangue is highly similar to that of traditional raw materials for ceramsite, being rich in ceramic-forming components such as SiO₂ and Al₂O₃, as well as gas-generating substances like Fe₂O₃. By optimizing raw material ratios and improving preparation processes, high-performance ceramsite products can be produced. This paper also highlights the technical challenges currently faced in industrialization and outlines future development prospects, aiming to provide a reference for the high-value resource utilization of coal gangue.