Abstract: In this paper, the experimental surface tension, contact angle experiments and experimental study of coal dust settling dust wettability wetting properties and preferred wetting agent. Studies have shown that: Suitable surfactants can greatly improve the wetting properties, distilled water and mine water test results mine water has better wetting properties; nine kinds of surfactants derived comparative tests primaries anionic and non-ionic surfactants the superior performance of cationic wetting agent and a zwitterion surfactant; wetting properties of the surface active agent is not necessarily proportional to the concentration of the surfactant, while the results at 30 ℃ better wetting properties of the surfactant; By wetting contact angle and dust settling tests, the final concentration of 0.35% come fast infiltration T is the optimal wetting agent.

Key words: Dust, Surfactant, Wettability, Sedimentation test, The contact angle, Surface tension