Study on dust suppression effect of surfactant on anthracite coal dust

Abstract

In this paper, the dust inhibition effect of fatty alcohol polyoxyethylene ether(AEO9), sodium dodecyl sulfate(SDS) and dodecyl trimethylamine bromide(DTAB) on respirable dust from Jincheng anthracite was studied. The dynamic surface tension of the surfactant solution and the dynamic contact angle on the surface of anthracite were measured by hanging drop method and pedicle drop method at CMC concentration; the adsorption strength of the surfactant and anthracite, the stability of the micelle and the diffusion coefficient of the single molecule in water were studied by molecular dynamics simulation. Experimental results show that AEO9 solution has the best dust reduction effect on coal dust, followed by SDS and DTAB the worst. Above the critical micelle concentration(CMC), the equilibrium surface tension of the hanging drop is AEO9<SDS<DTAB, and the time it takes for the hanging drop to reach equilibrium is AEO9(865.3 ms)<SDS(4 243.2 ms)<DTAB(5 108.5 ms); and the dynamic contact angle of AEO9 solution on the surface of anthracite drops the fastest. The simulation results show that the interaction strength between AEO9 and the surface of anthracite is the strongest, followed by DTAB, and SDS is the weakest. Although the diffusion coefficient of AEO9 in water is smaller than that of SDS and DTAB, but the micelles formed by AEO9 in solution are most easily dissociated. It is the reason why the AEO9 solution has better dust suppression effect.

Keywords

• surfactant
• wettability
• dust reduction
• micellar dissociation
• molecular dynamics
• dust suppression
• dust control