Abstract：Ground marble and dolomite were chosen as the materials to test the particle size distribution under different grinding time, and the Blaine specific surface area was calculated.The characteristic particle size, uniformity coefficient and specific surface area were determined by means of grinding dynamics and linear regression analysis using Rosin-Rammler-Bennet (RRB) equation as the particle size distribution model. The results show that with the increase of grinding time, the number of the particles in the range of 0¹0 μm gradually increases, the number of particles larger than 10 μm gradually decreases. The grinding efficiency decrease gradually with the time, and ground marble has a higher grinding efficiency than ground dolomite at the same time. The uniformity coefficient of ground marble increases, and the particle concentration phenomenon enhances, however, the uniformity coefficient of ground dolomite decreases, and the particle concentration phenomenon weakens. There exist logarithmic and double logarithmic correlations between the specific surface area and characteristic particle diameter of the two particles.

Keywords: ground stone; particle size distribution; uniformity coefficient; characteristic particle size