Fractal geometry has been successfully applied to the description of surface pattern of granular materials. The fractal dimension reflects the rugged and complex construction of particles and affects the mass specific surface area of ground product. The surface fractal dimensions of five size-intervals of ground auartz particles within 1 approx 20 mu m were measured. In the meanwhile, the same samples were analyzed by X-ray diffraction to determine their crystallien properties. It has been observed that the changes in the fractal dimension and the crystalline properties of ground particles took place with the decrease in the particle size. The effects of surface pattern and crystalline properties on the energy consumption of grinding were discussed. The dependence of the surface ruggedness on the crystalline properties of particles was analyzed.
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