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Descripción
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| The fraction of explosive energy spent in rock fragmentation is calculated for 40 blasts in a limestone quarry. The fragmentation energy is calculated from the fragments¿ surface area using the muckpile fragment size distributions obtained from digital image analysis of photographs of the material dumped into the primary crusher feeder. The fragmentation curves are necessarily limited in the fines at a non-negligible particle size, with the consequent loss of particle surface borne in the fine material. The surface in this range is accounted by extrapolation of functions fitted to the available data. The fragmentation energies obtained are discussed with respect to the shape of the size distribution in the fine end and the minimum particle size. The Weibull and the Swebrec functions have been used for the fitting, though only the former with a shape parameter greater than one can be used for the purpose of calculating specific surface down to zero or near-zero size. Small variations of the shape parameter can result in significant variations of the fragmentation energy; this, together with the unknown minimum particle size, encompasses some uncertainty of the fragmentation energy values. Using the functions that best match the fines region, it is concluded that the amount of energy spent in fragmentation ranges from about 1 % to some value hardly in excess of 8 % of the total explosive energy, with values more frequently occurring between 3 and 5.5 %. | |
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Internacional
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Si |
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Nombre congreso
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Fourth World Conference on Explosives and Blasting |
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Tipo de participación
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960 |
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Lugar del congreso
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Viena, Austria |
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Revisores
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Si |
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ISBN o ISSN
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978-0-9550290-1-1 |
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DOI
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Fecha inicio congreso
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09/09/2007 |
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Fecha fin congreso
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11/09/2007 |
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