The main methods for controlling coal mine dust are coal seam water injection and spray dust suppression,and the wettability of coal dust significantly affect the dust suppression effect.The particle size of coal dust and surfactants are important factors that influence the improvement of coal dust wettability.To study the effects of coal dust particle size and surfactants on coal dust wettability,six coal dust samples of different particle sizes from a coal mine are selected as test subjects,and f our surfactants(SDS,SDBS,Tween-80,and OP-10)are chosen to conduct experiments on the micro-characteristics and wettability of coal dust.Results show that the smaller the coal dust particle size,the larger the specific surface area;the smaller the average pore size,the poorer the wettability of the coal dust.The wettability of coal dust of the same coal quality decreases with the reduction of particle size.The wettability of coal dust varies with different surfactants,with the effectiveness of the four surfactants on coal dust wettability ranking as follows:OP-10>SDBS>SDS>Tween-80.When the mass fraction of surfactants in the solution exceeds 0.05%,the wettability of coal dust shows no significant improvement.In practical applications,using surfactants OP-10 and SDBS is more cost-effective.
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