To promote the proper disposal of local coal mine solid waste, such as coal gangue, improve the resource recovery rate of the mine, and ensure the safe use of surface buildings, Bulianta Coal Mine aims to utilize coal gangue and fly ash for cemented paste backfill. The goal is to establish a backfilling technology suited to the geological and mining conditions of the continuous mining and backfilling areas, specifically for roadway strip filling. This study analyzes the physical properties of the backfill slurry, determines the process parameters, and calculates the required backfill volume through laboratory tests on properties such as fluidity and bleeding rate. Based on these findings, the study outlines the aggregate processing process, which includes full-size double-stage crushing, and the pumping process with continuous mixing preparation. The proposed paste backfill system is reliable, with no leakage of coal gangue paste or pipeline blockages during transportation. This system enables the safe and efficient mining of overburden coal resources, promotes the recycling of solid waste, and contributes to the development of green mining practices.
coal gangue, cemented paste backfill, double-stage crushing
Zhang J., Zhu Y.,Huang Z. Research on Gangue Paste Backfill Process System of Coal Gangue in Bulianta Coal Mine. Int. J. Geo-Energy, 2024, 2(4), doi: 10.58531/ijge1031000005
