Performance Characterization of Composite Dust Suppressant for Burning Rock Dust in Open-Pit Coal Mine
In order to effectively solve the problem of serious pollution of burning rock dust in the open space mining and loading process of open-pit coal mine,sodium carboxymethyl cellulose,magnesium chloride,citric acid and sodium dodecyl benzene sulfonate were used as monomer materials to develop a composite dust suppressant with adhesion,moisture absorption,moisture retention and wetting functions.The microstructure of this dust suppressant was characterized by fourier transform infrared spectrometer and scanning electron microscope.The bonding,water retention,evaporation resistance,wind erosion resistance and dust suppression efficiency of the dust suppressant were analyzed.The results show that under the premise of ensuring good fluidity,the composite dust suppressant can effectively improve the hydrophilicity and adhesiveness of the burning rock dust and form a dense protective film on the dust surface.Under the condition of 25 ℃,the moisture content of the dust sample sprayed with dust suppressant is still 28％at 56 h,and the water loss rate is slow.Under the condition of 55 ℃ high temperature,at 16 h,the evaporation of dust sample sprayed with dust suppressant is about half of that sprayed with water dust,and the evaporation resistance performance is remarkable.Under different wind power levels,the maximum wind erosion rate of dust samples sprayed with dust suppressant is only 28％at 50 min.The comparison test of dust suppression efficiency shows that the dust suppression efficiency of the developed composite dust suppressant for total dust and respirable dust is better than that of three commercially available dust suppressants,which is 2.3 and 1.6 times higher than that of spraying water,respectively.The self-developed composite dust suppressant can essentially improve the physical and chemical properties of burning rock dust.Through chemical group modification,surface bonding,long-term moisturizing and other effects,it can effectively control the precipitation of burning rock dust,realize the prevention and control of dust source in the mining and loading process.
Open-pit coal mineBurning rock dustComposite dust suppressantPerformance characterizationSource prevention and control
万方数据
维普
