Technology of Controlling Spontaneous Combustion by Chemical Expansion Inert Foam at Large Inclined Angle Caving Surface

Coal spontaneous combustion is a major disaster of coal mine safety,the direct and indirect economic loss nearly hundreds of billion yuan caused by coal spontaneous combustion every year.Under the mining condition of large inclined angle caving surface,the effects of traditional controlling spontaneous combustion with grouting,nitrogen injection and voltage sharing fire prevention and extinguishment technology are not obvious and the short comings are more prominent.To solve this problem,injecting chemical expansion inert foam in gob is adopted.Through the industrial test in the Geting coal mine,good results were achieved.