Publication: Effect of particle shape on breakage function
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Date
2009-05-01
Authors
Kam, Winnie
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Abstract
For the determination of breakage distributions and understanding of complex nature of particle breakage took in industrial grinding mills, single particle breakage characterization test methods is used. There are two experiments in this study, one is the drop weight test and another is the grinding using ball mill. The shapes of particle used are flaky and equidimensional shape. In drop weight test, the breakage characteristics of different size fractions can be examined at various impact energies, Ecs, expressed in kWh/t. Relation between specific comminution energy level and the breakage index number (t10) was established on the size fractional base so that the variation in impact breakage characteristics of different particle shapes can be observed. From the result of the experiment, it has shown that the size and shape of particle do have influence on the breakage function. This is due to large particle tends to split away from the crushing platform when subjected to compression force by the drop weight and not been able to compress into smaller size. However, there is a different situation in the grinding of ball mill. The particle shape and time of grinding are closely related with the mechanisms of breakage in the mill for size reduction process. The main destructive breakage in the ball mill is impact force. As a result, for long time of grinding, the product of flaky particle is finer. For short time grinding, the equidimensional particle is ground into finer size due to the compression force. This shows that the compression force does not give much effect to flaky particles for short time grinding.