Study on effect of surfactant mixtures on wettability of low-rank coal dust

In order to solve the problem that coal dust is not easy to be wet by water, surfactant is added into water to make mixture solution. By testing the surface tension, contact angle and settling time of coal dust of raw water, 5 different types of surfactant monomer solutions and 5 mixed solutions, the influence of surfactant on wettability of coal dust is studied. The results show that anionic and non-ionic, anionic and anionic, non-ionic and non-ionic surfactant mixtures can play a synergistic effect and significantly improve the wettability of coal dust. The mixture solution of rapid penetrant T(w=0.06%) and APG(w=0.20%) demonstrate the best wetting ability, the settling time of 100 mg coal dust in solution is 0.22 min. The results can provide reference for the selection of surfactant.