Research on measurement of specific energy of crushing based on particle compression experimen

Abstract

In order to better characterize the strength characteristics of coal, according to P. R. Rittinger’s new surface theory, a determination method of specific energy of crushing based on particle compression experiment is proposed. Based on this method, the specific energy of crushing of primary coal and different types of tectonic coal in Yangquan Mining Area is systematically measured. The results show that the specific energy of crushing of tectonic coal in Yangquan Mining Area is 18.14-87.39 J/m2, which is 1-2 orders of magnitude lower than that of primary coal(about 1 098.46 J/m2); at the same time, the specific energy of crushing of broken coal (64.26-87.39 J/m2) is significantly greater than that of mylonitic coal(about 18.14 J/m2), which is 3.54-4.82 times that of mylonitic coal.

Keywords

• coal and gas outburst
• particle compression
• surface area
• specific energy of crushing
• coal strength