|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|275374||1429526||2016||7 صفحه PDF||سفارش دهید||دانلود رایگان|
After gas drainage, the outburst seam is dry and, consequently, during subsequent mechanized mining, unwanted dust production is extensive. Because the hard dustfall typically has a small particle size it contains a high percentage of respirable dust. Considering these factors, this paper improved the efficiency of dustfall by reducing the surface tension of the liquid used as a wetting agent, then configuring five kinds of wetting agents by adopting various doses and types of surfactants, neutral inorganic salts and chemical additives, etc. After purchasing DA-85 and SRJ-1 wetting agent, the surface tension and critical micelle concentration of seven kinds of wetting agents were measured using the capillary rise method. Wetting agent A was confirmed to have the best comprehensive effect. The experiments were optimized by measuring and comparatively analyzing contact angles of pure water, SRJ-1 wetting agent and wetting agent A on the surface of different coal samples using a contact angle measurement instrument (HARKE-SPCA). By comparative analysis, dust-proof effects of seam, dynamic pressure water infusion and high-pressure spray in the tunneling face at the Daning coal mine using pure water, wetting agent SRJ-1and A, it was determined that after using wetting agent A, the average dust concentration in the place of the mining machine driver, 10 m and 110 m away from the tunneling front is approximately 300 mg/m3, 240 mg/m3 and 100 mg/m3, respectively. This practice increased the dust-proof efficiency dramatically and achieved a good comprehensive dust-proof effect.
Journal: International Journal of Mining Science and Technology - Volume 26, Issue 4, July 2016, Pages 669–675