Mine backfill technology refers to filling or backfilling abandoned mine caves or excavated earth and rocks to restore them into usable land or prevent environmental pollution. This technology is very important in modern mining because it can effectively reduce environmental pollution, recover valuable resources, and leave good land and water resources for future mining.

In underground mines, the method of filling lightweight foam materials is often used to control roof collapse, cavity voids, gas accumulation voids in goafs, upper and lower corner voids, etc.; to quickly build temporary closed walls underground in coal mines, rapid filling and foaming is required materials or loess to seal harmful gases such as gas; underground coal mine goafs or waste roadways are prone to coal seam fires due to the spontaneous combustion characteristics of coal seams, and need to be quickly filled with sealed, high-temperature-resistant fire-fighting materials, etc. A large amount of filling materials and fire-fighting filling and sealing materials are used in coal mines in my country. Traditional methods include yellow mud, coal gangue, fly ash, cement mortar and other filling materials; in recent years, phenolic resin filling Materials, polyurethane filling materials, foamed cement, etc. have gradually replaced traditional fillings such as yellow mud.