EVALUATION OF IMPACT OF PARAMETERS OF DISTRIBUTION OF BLASTHOLES ON OUTPUT SUBSTANDARD QUARTZ ORE FRACTION

Abstract

In the extraction of granular quartz, there is a problem of overgrinding as a result of blasting operations. During the underground mining the main method of blasting operations is blasthole blasting by the rings of continuous charges. Among the main drawbacks of the method are the uneven distribution of explosives on the plane of the blasted layer and the consumption of a significant part of
the energy of continuous charges on the blasting impact necessarily associated with ore overgrinding. As a solution to these problems, the author have proposed the blasting technology which essence being that the uniformity of the distribution of the concentration of the explosives strength in the blasted layer is ensured using the distribution of charges by air intervals and a certain order of their placement in the plane of the ring arrangement. For the practical implementation of the technology, the authors have developed a method for forming the distributed charges in raising deep drill holes, which does not require additional labor and special means. The authors have created a special technique allowing to determine the distribution parameters ensuring the sustained specific
consumption of explosives over the entire plane of the blasted layer. On the basis of experimental studies the authors have established the optimal distribution parameters.