Dust reduction technology of fully mechanized caving face

The No.3 coal in Zhaozhuang II mine is a thick coal seam,fully mechanized top coal caving is selected coal mining method,and large dust concentration is produced during the production process;the traditional method of spray and dust reduction is not able to meet the needs of dust reduction.In order to further reduce dust concentration in coal face to improve face labor environment,to create a safe and efficient mine with good production conditions,according to the 3# coal seam’s few porosity,low permeability,and poor wetting condition,we adopted the mixed water injection technique for analysis research and field testing.Expound drill holes’distribution,water injection hole sealing process,water injected method and dust suppression effect.Analyze coal seam water injection effect on the advance of working face abutment pressure changes,and add TX-10 of alkyl phenol polyoxyethylene ether surfactants to improve wettability of coal,enhancing coal seam water-wet effect.The results showed that after putting the mixed water injection technique into effect,the coal moisture is increased by 1.61%,all average rate of dust reduction is 58.71%,and the average rate of respirable dust fall is 57.34%,substantially reducing the dust concentration.The practice shows that this technique of water injection for dust reduction can be applied into fully mechanized caving coal face.