Detection and Control Technology of Spontaneous Combustion Area in Coal Rejects Dump of Xiqu Mine

Abstract：According to the proldem that the spontaneous combusted coal rejects dump would send out the harmful gas to pollute environ- ment and could have explosion dangers, thus a comprehensive fire distinguishing was conducted to the serious spontaneous combusted coal rejects dump in Xiqu Mine in order to purify the environment and eliminate the danger purposes. The comprehensive detection technology with the infrared temperature measurement, multi parameters gas detection and borehole temperature measurement was applied to deter- mine the fire distribution at the east side of the coal rejects dump with an area of 650 m2. An rational layout of grouting boreholes, grou- ting parameters determined, fly ash from coal-fired power plant and the new fire prevention and control material was applied to the fire ex- tinguishing with grouting. The fire prevention and control results showed that the CO volume fraction in the coal rejects dump was reduced from 840x10-6 to 12x10-6 , the H2S volume fraction was reduced from 89x10-6 closed to 0 and the SO2 volume fraction was 0. The surface temperature of the coal rejects dump and the local temperature was the same and the internal temperature was reduced from 420℃ below to 80 ℃. Those results could meet the requirements stipulated in Disaster Prevention and Control Standard of Coal Rejects Dump in mine.