Abstract: Hanglaiwan Coal Mine has successfully developed a CO₂ fly ash mineralized filling material CFBF by skillfully utilizing the fly ash resources of local power plants in combination with the actual situation.Through the analysis of the properties of CFBF filling material and its practical application effect in the delayed filling of goaf, we provide ideas and methods for the preparation of conventional low-calcium fly ash CO₂ mineralized filling material under normal temperature and pressure conditions, and put forward a new reference scheme for the delayed filling mining of goaf, which promotes the further development and optimization of coal mine filling mining technology.