Coal Gangue Sialite Cementitious Materials And Its Application In The Field Of Paste-like Backfill

Under the guidance of the theory of the geology and simulation of natural rock formation, coal gangue Sialite cementitious material was prepared by using calcined and grinded coal gangue as the main raw material. The performance parameters of coal gangue Sialite cementitious material completely met the national standards of OPC. Meanwhile, paste-like fill slurry was prepared by using coal gangue Sialite cementitious material as the cementing agent, and using iron tailings and fly ash as the fine aggregate. The experimental data indicated that the main difference between Sialite cementitious material and cement is that the former can bond fine silicate materials such as tailings, fine sand, clay, etc. The strength of Sialite paste-like fill body is 2～3 times as much as that of cement paste-like fill body with the same dosage. The bonding mechanism of Sialite cementitious material solidifying fine grade silicate materials was analyzed by using SEM and spectrum analysis. Finally, Sialite on-site applications for coal mining backfill are presented, which provided good economic and environmental benefits.