Abstract: Nonionic wetting agent and anion wetting agent were selected to combined through the laboratory test, and it aim at different metamorphic grade coal sample and efficiency of dust collection, analysis was done on the relationship between aqueous solution thickness and moist time of wetting agent. The result indicates that aqueous solution concentration 20%~40% is the best of nonionic wetting agent and anion wetting agent. With increase the metamorphic grade of coal in the same kind of wetting agent, nonionic wetting agent and anion wetting agent dust removal effect got worse and worse.

Key words: Dust, dust wetting agent, Moist time, Metamorphic grade, Efficiency of dust collection