Drop weight test results can be used to evaluate the single particle breakage
strengths of materials on the size fractional base. Results of such tests can then be used
in the comminution models of autogeneous and ball mills. Size dependent breakage
behaviour of materials is an important problem in terms of grinding modelling studies
since the breakage distributions of the mill feed materials are commonly determined
by using the breakage data of single particle size broken at an appropriate specific
comminution energy level. In most of the modelling studies, breakage distribution
function of materials are assummed to be independent of particle size just to ease the
grinding modelling work which is not true for most of the materials. In order to
achieve more reliable grinding simulation results, a detailed breakage study should be
carried out in such a way that, different size fractions of the same material should be
broken from the same level of specific energies.In fact breakage distribution of each
size fraction should be defined in comminution models in some way.