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In order to improve binding capacity between water and dust and the efficiency of dust removal in spray, in this paper, the surface tensions and contact angles of four surfactant solutions, such as SDS, CAB-35, JFCS and BS-12, in different concentrations were tested by using automatic surface tensiometer and video optical contact angle measuring instrument, determining their CMC, which was also the concentration ratio of the four surfactant solutions; By the principle of each two single surfactant's combination, coal dust settling and up-ward seepage experiments of the six combination solutions were conducted, combined with simulation experiment, determining that the optimum surfactant agent used for de-dusting was the combination of these two surfactants: CAB-35 and JFCS, in the mass fraction of 0.05%. Meanwhile, it was also applied in fully mechanized heading face of 2th mining area of Xin Zhi coal mine, Huozhou Coal Electricity Group, Shanxi Coking Coal Group

Experiment and Research of Chemical De-dusting Agent with Spraying Dust-settling