Influence of the Particle Retention Time

To analyze the influence of process time on particle strength, tests were performed under dry conditions without liquid injection. In Fig. 7.30 the breakage probability of different samples taken at 5, 10 and 15 min retention time is depicted. 

The measurements show that the mean specific breakage energy increases with increasing process time. Longer tests reveal that the increase in particle strength stops after about 15 min. These results can be explained by the selection of weak particles, which easily break, out of the particle population. 

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