Research on dust reduction performance of coal seam compound wetting agent

Li Maolin; Zha Jian; Chen Qiaojun

doi:10.19896/j.cnki.mtkj.2025.01.014

Abstract：In order to enhance the dust reduction effect of water injection in coal seams,the No.8 coal seam of Malan Coal Mine was taken as the research object,and surfactant compounding technology was used to design compound wetting agents as water injection ad-ditives,their application potentials in terms of wetting and dust reduction efficacy in coal seams were systematically evaluated.Disodium monosodium lauryl sulfosuccinate(AK-201A),sodium dodecylbenzene sulfonate(SDBS)and aliphatic alcohol polyoxyethylene ether(AEO-9)were selected as wetting agents,and the effects of different mass fractions of monomer wetting agents and different compound ratios of wetting agents of SDBS and AK-201A and AEO-9 on the surface tension of water and the complete sedimentation time of coal dust were studied respectively.The results show that the wetting agent can effectively reduce the water surface tension and accelerate the settlement of coal dust,thus improving the dust reduction efficiency.With the increase of the mass concentration of the wetting agent,the surface tension of water and the sedimentation time of coal dust decreased gradually.Among the three wetting agents,SDBS showed the best dust reduction performance,especially when it was compounded with AEO-9 in the ratio of 3∶1,which demonstrated a better wetting and dust reduction effect.