褐煤在微波场下的孔隙结构及其分形维数变化特征  

Porestructure and fractal dimension changes of lignite under microwave irradiation

作　　者：任阳光 曹志华[1] 孙阳阳[1] 王睿[1] 徐志强[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《中国矿业》2017年第5期142-147,共6页China Mining Magazine

基　　金：国家自然科学基金面上项目"微波辐照强化褐煤成浆机制的研究"资助(编号:51574251);国家自然科学基金项目资助(编号:51274208;51204190);国家重点基础研究计划(973)项目资助(编号:2012CB214900)

摘　　要：为了探究微波辐照对褐煤孔隙结构及表面形貌的影响,将低温氮吸附法和扫描电镜相结合。测定了煤样经微波辐照前后比表面积、孔容、平均孔径及分形维数的变化;通过扫描电镜清楚观察到煤样的孔隙形状及表面形貌。试验表明:随着微波辐照时间/功率的增加,煤样孔隙分形维数值逐渐减小;平均孔径逐渐减小,比表面积和孔容先明显减小随后略微增加;褐煤表面逐渐趋于平整光滑,孔洞收缩。Combining low-temperature nitrogen gas adsorption and scanning electron microscopy （SEM） to investigate the effects of microwave irradiation on pore structures and surface topography of lignite. The use of these techniques allows us to determine the specific surface area, pore volume, average pore size, pore shape and surface topography. It is concluded that with the increase of microwave irradiation time or power, fractal dimension values and average pore size decreased gradually; specific surface area and pore volume decreased remarkably and then increased slightly; the surface of coal sample tended to be smooth and the pore holes shrank.

关 键 词：分形维数 孔隙结构 低温氮吸附法 扫描电镜 

分 类 号：TD94[矿业工程—选矿]