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Descripción
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| The influence of blasting on the excavators' efficiency, given as mucking rate (amount of rock mucked per unit time) and mean bucket load (amount of rock loaded in each bucket operation), is investigated. Rock characteristics, blasting parameters (drill pattern, explosive energy, and charging) and the excavator¿s performance (truck loading time and number of buckets to fill a truck) were monitored in eleven blasts in an open pit iron ore mine. ANFO, ANFO/emulsion blend and watergel were used in the blasts and the powder factor was varied between 0.98 and 1.45 kg/m3. The mean bucket load is mainly affected by the bucket size, being independent on the blasting parameters. Besides the relation with the mean bucket load, the mucking rate was found to be positively correlated with the explosive energy, whereas no significant correlation with the rock properties was found. The analysis of the data obtained together with other published work suggests a non-monotonic relation of the mucking rate with the powder factor, with a maximum mucking rate at a certain powder factor. This is especially true when the useful work of the explosive per unit rock volume is used rather than the classical mass powder factor and considering only the amount of explosive above grade. | |
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Internacional
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Si |
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DOI
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Edición del Libro
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0 |
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Editorial del Libro
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CIM-Canadian Institute of Mining, Metallurgy and Petroleum |
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ISBN
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1894475828 |
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Serie
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Título del Libro
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CIM/ICM bulletin technical papers 2007: peer-reviewed technical papers published by the Canadian Institute of Mining, Metallurgy and Petroleum |
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Desde página
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246 |
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Hasta página
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256 |