Evaluation on blast efficiency for optimum mill performance
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Date
2019-07
Authors
Nurul Zulaikha Binti Harudin
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Abstract
This study was carried out to examine the evaluation on blast efficiency for
optimum mill performance. This study site is located at two different quarries which in
Kulai and Ulu Choh, Johor, Malaysia. The preliminary study includes a total of four
blasting sessions, fragmentation analysis of blasted muck-pile, point load test and
calculated the energy consumption of crusher for size reduction of blasted rock. The
fragmentation analysis was conducted using WipFrag image analysis. WipFrag is an
automated image based granulometry system that uses digital image analysis of rock
photographs and video tape image to determine grain size distributions. After blasting
operation had been performed, several image of muck piles were captured. This analysis
estimates the fragments size produced in each of the four blast sessions. The strength of
rock in each blast session was evaluated by using point load test and the mean Uniaxial
Compressive Strength. The point load test is an accepted rock mechanics testing
procedure used for the calculation of a rock strength index. Lastly, the energy
consumption of size reduction for crushers was measured using Bond’s Third Theory of
Comminution. It was found besides blast design; the geological site of each quarry has
significant impact on rock breakage resulting rock fragmentation during blasting.