Assessment of Water Retention Capacity of Non-Ionic and Anionic Fluorinated Dust Suppressants on Coal Dust

Abstract

Wet-spray dust reduction technology is one of the many dust control measures used to address the underground coal dust hazard. The wettability and agglomeration effects between coal dust and dust suppression solution directly affect the dust reduction efficiency. The water retention of the dust suppression solution also affects the wetting effect of coal dust and the possibility of secondary dust generation after settling.. Fluorinated solutions are known for their good thermal and chemical stability and ability to reduce interfacial tension with a small dose, while also maintaining surface activity in the solution system. This study investigated the wetting and agglomeration effects of non-ionic and anionic fluorine-containing solutions at different concentrations in conjunction with coal dust by studying the water retention of coal samples. The experimental results show that the water retention of the non-ionic fluorinated solution is significantly better than that of the anionic fluorinated solution. The lowest mass loss was 10.0909 g for FS-31 and FS-34 at 0.03% concentration. The best overall solidification state of the coal sample surface after the experiment was attained with the FS-50 solution. The surface of the coal sample was dense and crack-free, with the lowest probability of secondary dust emission.