Abstract: Due to the particle shape is irregular and the size is non-uniformity,it is difficult to measure the real crushing strength of particle breakage by measuring actual contacting area.In order to solve this technical difficulty,a typical carbonate manganese ore which obtained from Guangxi was used in the simulation test of single-particle breakage.Further,fractal method was used to study the fractal dimension of broken ore in the simulation test.Finally,the relationship between crushing strength and parlicle's uniaxial limit comprehensive strength,particle size,fractal dimension was investigated.The study shows that greater exists in fractal dimension of raw ore and sand return,the relationship among crushing strength and particle size,fractal dimension was obtained.This formula can predict the real crushing strength of single particle breakage.

Key words: Static load, Single-particle breakage, Statistical, Fractal method, Crushing strength