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Another title in MEI Conference: Energy consumption applied to high pressure grinding rolls modelling with population balance models. http://www.min-eng.com/comminution16/paps.html, High pressure grinding rolls are a good alternative for comminution. This device presents low operative cost and high energy performance. Modelling of 16 mono-size assays have been carried out using grinding rolls with controlled operative pressure and tangential velocity. Back-calculation of the different parameters of the model have been developed with MATLAB software. The fitting of the simulated curve is in a good agreement with the experimental data in a wide range of tests. The present model describes correctly the physical behaviour of the particles within the high pressure grinding roll. The error is low except for experiments with small feed particle size. This situation could be explained because for fine particle sizes the bed compression phenomenon is predominant. The particle size distribution has been monitored in the input and output for each assay. The validation experiments show that the model is consistent. The selection function describes adequately the breakage probability of the particles inside the high pressure grinding rolls. Then, the present model is a good alternative for simulating a high pressure grinding roll process., Peer Reviewed