Comminution process can be regarded as an assembly of single fractures, and as a natural result the behaviour of the materials in single fracture an essential role in the performance of the comminution system. In this paper glass spheres and irregular shaped limestone particles with different grain sizes have been comminuted under various impact velocities and the behaviour of these materials in high velocity comminution has been investigated and the results have been analysed for the size distribution of the products. Using these results the authors have tried to estimate a performance of a high velocity impact comminution system by simulation study. A summary of the results is as follows:
(1) Size distribution of the product is with a unique function of the impact velocity, and can be normalized in terms of the feed size.
(2) The results of simultion indicates that the multistage comminution system of relatively low impact velocity can make the best use of comminution energy.
(3) Impact comminution experiments on limestone particles showed that the peak of the size distribution of the products is consistent with the crystalline grain size of the materials.
