Comprehensive Treatment for Goaf Residual Coal Spontaneous Combustion in Close Distance Upper and Lower Coal Seam

The seam distance between 22^# coal seam and overlying 12^# coal goaf in Bulianta Coal Mine is 36 to 51 m. The overlying goaf residual coal is liable to oxidation and spontaneous combustion because of lower coal seam exploitation. The overlying goaf appeared the high temperature area when 22305 comprehensive mechanized mining face was mining. To eliminate the high temperature area, we adopted treatment measures including ground drilling, drilling temperature measurement, pouring the ash, liquid CO₂, liquid N₂ and yellow mud, partial closure of working face. By means of the comprehensive measures, the treatment effect was obvious, the face gas index maintained the normal state, and the face was exploited safely.