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Author: Admin | 2025-04-28
Is approximately 36 μm, the dust particle distribution below 230 μm is the greatest, and the dust below 1 μm is the least, which is consistent with the above distribution characteristic map analysis. From the D50 and D90 data values of the 1# and 2# dust samples, it can be found that the median particle size of 2# dust is significantly greater than the median particle size of 1# dust. The D90 of 2# dust is much larger than the D90 of 1# dust, and the contrast is more obvious. It can be concluded that the overall dust particle size in the disturbance zone is larger than the dust particle size in the non-disturbance zone. This is because most dust particles in the non-disturbance area originate from the disturbance area. The dust particles generated by mechanical operations in the disturbance area are larger, directly settling in the area, but some of them are transformed into smaller dust particles. The smaller dust particles are lifted by the wind and brought to the non-disturbance area without interference. Thus, the size of the dust particles in the non-disturbance area is generally smaller than in the disturbance area. 3.1.2. Dust Suppressant Efficiency AnalysisWe placed a quantitative yellow sand sample in a Petri dish, sprayed the dust suppressant on the yellow sand sample, obtained a sample after crusting, placed the sample in an incubator for storage, and took out the sample every 12 h and placed it into a hair dryer testing machine to detect the weight loss of the sample. The experimental results are shown in Figure 7.Figure 7 shows that the dust suppression efficiency of the dust suppressant solution will increase with the increase in the quality of modified starch in the dust suppressant. The dust suppression efficiency increases rapidly when the concentration of the dust suppressant is 0.1~0.7%, because starch can act as a water absorbent and flocculant in the dust suppressant to improve the dust suppression efficiency. The dust suppression efficiency of the dust suppressant will decay with the increase in time, the minimum attenuation is 10%, and the dust suppression effect of each concentration from the best dust suppression agent will be attenuated to 10% within 3 d because, with the increase in time, the evaporation of water in the dust suppressant weakens the dust suppression effect of the dust suppressant. When the concentration of dust suppressant is above 0.7, the dust suppression efficiency within 12 h is more than 90%, of which the dust suppression effect is maintained at 90% when the concentration of dust suppressant is 0.7. The time is less than 4 d, and the holding time of the dust suppression effect increases as the concentration of
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