新景矿无烟煤纳米级孔隙结构特征的原子力显微镜研究

Study on Characteristics of Nano-pore Structure of Anthracite in Xinjing Coal Mine by Atomic Force Microscopic

阳泉矿区新景矿3#煤层为强突出煤层,为了认识3#煤纳米级孔隙结构发育特征,在井田佛洼分区3215辅助进风巷掘进头处采集了3#煤样品(XJ-3)。通过原子力显微镜(AFM)技术观察了XJ-3样品的形貌发育特征,并结合图像分析法,获得了该煤的表面粗糙度Ra和均方根粗糙度Rq。结果表明:新景矿3#煤表面孔隙形状大多以椭圆形和梨形为主,次为圆形,含少量不规则长条形,孔隙之间的连通性一般,喉道多呈现出圆柱形;该煤的面孔率为5.74%,表面孔隙以微孔、小孔为主,中孔、大孔不甚发育;该煤的表面粗糙度Ra和均方根粗糙度Rq值分别为3.89和6.17,与同变质程度煤相比,该煤表面相对光谱,凹凸程度相对较弱。

The 3#coal seam in Xinjing Mine of Yangquan Mining Area is a strong outburst coal seam.To understand the development characteristics of nano-scale pore structure of 3#coal,this study collected 3#coal samples(XJ-3)at the heading of3215 auxiliary air inlet lane in Fowa sub-area of mine field.The morphology and development characteristics of XJ-3 sample were observed by atomic force microscope(AFM),and the surface roughness Raand root mean square roughness Rqof the coal were obtained by image analysis.The results show that the surface pore shape of 3#coal in Xinjing Mine is mostly oval and pearshaped,and the secondary is round,with a small amount of irregular strip shape.The connectivity between pores is general,and the throat is mostly cylindrical.The face rate of this coal is 5.74%,surface pores are mainly micropores and small pores,and mesopores and macropores are not well developed.The surface roughness Raand root mean square roughness Rqvalues of the coal are 3.89 and 6.17 respectively.Compared with the coal with the same metamorphic grade,the surface of the coal has relatively weak concavity and convexity.