关键词: 油页岩, 层理角度, 破碎形式, 粒度特征, 优势破碎角度

Abstract: Oil shale contains a large number of stratification structures. The variation of stratification angle can cause a large difference in crushing form and crushing size. In order to clarify the dominant impact crushing angle,crushing form and particle characteristic under the influence of stratification angle,sieving test,oil content determination,electron microscope scanning analysis and numerical simulation were carried out. The results showed that oil shale particles in the range of 3~ 1 mm particle size have high oil content,which is the advantageous particle size range for oil shale particle crushing. The form of oil shale fragmentation is influenced by the stratigraphic structure,and the crushing forms can be divided into five types under different stratification angles, namely, splitting damage through layers, shearing damage through layers, through-layer damage, shearing damage and splitting type of shear tensioning damage. At 70°,80° and 90° stratification angles,the particle size of crushed oil shale is smaller,and the content of dominant particle size reaches more than 40%. Among them,the dominant particle size content is the highest at 80°,and the uniformity of oil shale particles is better at 90°. It can be considered that the dominant impact crushing angle of oil shale is 80° ~ 90°. The particle size distribution function of oil shale after crushing is essentially a description of the fractal distribution. On this basis,the Weibull distribution function model is used to quantitatively describe its crushing particle size,and the results are more accurate.

Key words: oil shale,stratification angle,crushing form,particle size characteristics,dominant crushing angle