In order to prevent and control the pollution of coal dust and reduce the damage of coal dust to human body, spray dust removal is one of the most widely used dust removal methods in mines at present. The wetting property of coal dust is directly affected by water, and the wetting property of coal dust can be improved by adding surfactants to water. Considering the impact on the environment, two kinds of biosurfactants, rhamnose-lipopolipid and lactone sophosopolipid were selected,and the wetting property of bituminous coal by combining experimental and molecular simulation techniques were studied. On the one hand, the contact angle and sedimentation experiment of coal dust in surfactant solution were studied through surface tension experiment of two kinds of biosurfactants with different concentrations. It was found that rhamnoolipid solution with a mass fraction of 0.1% could achieve the most suitable wetting effect, and the wetting effect of rhamnoolipid was better than that of sophorolipid. On the other hand, the wiser coal chemical structure model is used as the adhesion base, and the materials studio molecular simulation software is used to establish a water-biosurfactants-bituminous coal ternary adsorption system, and molecular dynamics simulation were carried out. Through in-depth analysis of adsorption configuration, spatial distribution, interaction energy and mean orientation shift of water molecules, etc. Then the mechanism of biosurfactant on coal surface wetting was studied. The results show that rhamnoolipid has better effect on promoting coal dust wetting than sophoripid in the simulation results, which is consistent with the experimental results.
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