Preparation and performance evaluation of dust suppressant for gas drainage borehole orifice

Abstract:

Addressing the severe coal dust hazard at the orifice of gas drainage boreholes in deep coal mines and the low efficiency of conventional dust control technologies， this study aims to develop a high-efficiency， eco-friendly composite dust suppressant with a synergistic dust suppression mechanism. A graft copolymer （PSA） was synthesized via graft copolymerization using sodium alginate， polyvinyl alcohol， and acrylamide as raw materials. A novel composite dust suppressant （PSAA） was then formulated by compounding PSA with the surfactant APG0810. The structure and thermal stability of PSA were characterized by Fourier Transform Infrared Spectroscopy （FTIR） and Thermogravimetric Analysis （TGA）. The dust suppression performance of PSAA was evaluated through a series of experiments， including sedimentation experiments， contact angle measurement， and anti-evaporation and wind erosion resistance tests. The results indicate that PSA possesses excellent thermal stability. The PSAA solution demonstrated outstanding wettability， exhibiting a contact angle as low as 24° with the coal sample， a 61.9% reduction compared to that of water. It also showed significant moisture retention at 50 °C and a wind erosion resistance rate of 81.73% even under strong wind conditions of 9 m/s. Scanning Electron Microscopy （SEM） confirmed that PSAA forms a dense， consolidated layer on the coal dust surface， achieving a synergistic "wetting-bonding-curing" dust suppression effect. This novel dust suppressant is characterized by a simple preparation process and superior performance， offering a new technical approach and solution for the effective control of coal dust at the orifice of gas drainage boreholes.