How the distribution of blasting charges influences the energy of comminution of rocks
DOI:
https://doi.org/10.17159/Abstract
The most energy demanding process in the mining industry is particle size reduction: comminution. The first phase of this is blasting, that fragments the rock from the initial Boussinesq’s half-space size. Scientific literature demonstrates the output of a blast in terms of grain size distribution can be arranged by varying specific charge (Powder Factor, P.F.) and charge distribution. The present study focuses on the influence of blasting on the internal resistance of the fragments of blasted rock; in particular it is address the influence of the distribution of charges in space. Small-scale blasts have been performed on 14 marble blocks with different P.Fs. and charge distribution. Three control blocks have been fragmented by mechanical means for comparison. Results show the correlations between charge distributions and the specific energy of mechanical comminution. It is finally discussed the opportunity of adjusting charge diameters and distributions in open-cast blasts to improve the output of the comminution circuits.
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Copyright (c) 2024 Jacopo E Seccatore, Marilena Cardu, Tatiane Marin
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