煤中伊犁石和黄铁矿的破碎行为研究

Research on Fragmentation Behavior of Illite and Pyrite in Coal

通过对2种外在矿物质伊犁石和黄铁矿在沉降炉内的高温试验,以及数学公式对试验数据的简单拟合,研究了这2种矿物的破碎行为。试验条件为:温度1250℃,矿物颗粒粒径小于300μm,炉内燃烧气氛是空气。试验结果显示:2种矿物质确实发生了破碎,试验前、后矿物质颗粒的粒径分布变化很大,试验后体积平均粒径变小;用场发射扫描电镜对伊犁石样品进行观察后发现,伊犁石颗粒试验前棱角清晰,并无裂纹,试验后部分矿物质颗粒存在大量裂纹和缝隙,部分矿物则熔融形成球形,并拍摄了清晰的形貌图;用数学公式对试验后数据进行统计拟合后发现,每个伊犁石母颗粒平均破碎形成2个子颗粒,而每个黄铁矿母颗粒平均破碎形成4个子颗粒。

The fragmentation behavior of pure excluded mineral of illite and pyrite are studied based on the high temperature experiments in a drop tube furnace and mathematical simulation. Experimental conditions are selected as： reaction temperature is 1250℃; mineral particle size is smaller than 300μm; combustion atmosphere is air. The experimental and calculation results indicate that, illite and pyrite indeed undergo fragmentation, the particle size distribution of two mineral has obvious change and mean diameter for volume decreases after experimentation. A scanning electron microscope is used to analyze illite mineral particle, the raw mineral has sharp angles and no fissures, after experimentation, a portion of the mineral residues has obvious fissures and cracks, others melt and form to sphere, excellent SEM images are obtained. Compared particle size distributions of experimentation with mathematical simulation, the results for illite suggest that a large grain generate two pieces of fragments, whereas a pyrite produces four segments.