Abstract: In view of the defects existing in the present fire control technology for coal mines, a solidified foam of fly ash with a foaming expansion rate of 3~15 was developed based on the laboratory test by using self-developed compound additive and with fly coal ash as the main material.The solidified foam of fly ash was used to block the underground air leakage for controlling the coal seam spontaneous combustion at 1410 working face of Huafeng Coal Mine, and achieved very good effect.

Key words: Fly ash, Compound additive, Solidified foam, Fire control in coal mine