SDS溶液改变无烟煤润湿性与冲击产尘粒径分布的实验研究

为了提高无烟煤层注水效果,采用不同浓度的十二烷基硫酸钠(SDS)溶液对无烟煤样进行了浸泡改性,并对浸泡改性前后煤样的表面基团、煤/水动态接触角、自然吸水率以及冲击产尘粒径分布规律进行了测试和分析。结果表明:SDS溶液浸泡改性使无烟煤样润湿性增强,煤/水动态接触角随SDS溶液浓度的增加呈指数规律降低;改性煤样的自然吸水率随着SDS溶液浓度的增加呈指数规律增加。自然煤样和改性煤样在饱水状态下的冲击破碎产尘粒径-质量分布具有分形特征,煤样的自然饱水率越高,受冲击产尘粒径-质量分布的分形维数越小;随着SDS溶液浓度的增大,其改性煤样的冲击产尘粒径-质量分布分形维数减小,即产生的微细粉尘总量减少。

Experimental Study on Influence of SDS Solution on Wettability and Grain Size Distribution of Impact Crushing Dust Production in Anthracite

To improve the water injection effect of anthracite coal seam, the anthracite sample was modified by soaking with sodium dodecyl sulfate(SDS) of different concentrations, and the surface groups, coal/water dynamic contact angle, natural water absorption and particle size distribution of impact dust production before and after immersion modification were tested and analyzed. The results show that the wettability of anthracite is enhanced by immersion modification of SDS solution, the dynamic contact angle of coal/water decreases exponentially with the increase of SDS solution concentration, and the natural water absorption of modified coal increases exponentially with the increase of SDS solution concentration. The particle size-mass distribution of natural coal samples and modified coal samples under saturated water has fractal characteristics. The higher the natural saturation rate of coal samples, the smaller the fractal dimension of particle size-mass distribution of impact crushing dust.With the increase of SDS solution concentration, the fractal dimension of particle size-mass distribution of impact crushing dust of modified coal samples decreases, that is, the total amount of fine dust produced decreases.