In rock crushing process, a key goal is understanding of fragmentation behaviour, which could be used to improve productivity and efficiency in mining operations. In this study, the input parameters, such as feed size, output particle size, and the energy expended in the process are carefully monitored. The test was based on a modified Hopkinson pressure bar system and a Piston-holder system. The energy consumed by the sample during fragmentation was determined by considering the energy carried by the incident wave and the reflected wave. A granite with the feed size ranging from 9.5 to 12.7 mm was employed in this study. The samples were impacted sequentially from one to ten times, with fragment size reduction determined after each set of impacts by sieve analysis. The link between fragment size distribution and the energy absorbed by the samples was examined.

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