EXPLOSIVE BREAKING OF QUARTZ BY CONCENTRATED CHARGES IN UNDERGROUND MINING

The results of experimental studies breaking of the granular quartz of Kyshtym deposits in underground mining. On the basis of theoretical studies conducted previously, physical and mathematical modeling of the process of breaking, hypothesized that while blasting fan of all the charges they act as a flat charge system. This effect allows you to avoid the area of fine crushing in the near zone of the explosion. Previously, only parallel borehole charges considered as a flat charge system. In the course of the experiment received unique photos spall layer, supporting this hypothesis. It has been established that the responsibility for the output of small fractions of quartz is a blow broken ore layer of the wall of the chamber and the collision pieces together. The extent of this impact is directly proportional to the power of the explosion, that is specific consumption of explosives to the breaking. Developed and tested in practice construction of charges with air gaps in the long ascending boreholes of small diameter, allows you to manage specific consumption at pneumatic conveying of granular explosives. The methods of sieve analysis and photo planimetry established dependence of the sub-standard and oversize fractions of broken ore from the specific consumption of explosives in the breaking.

The study has been carried out under the State Contract No. 007-01398-17-00. Subject No. 0405-2015-0010: Theoretical Background of the Integrated Mineral Development Strategy and Mining Technologies with Regard to Features of Transient Processes during Dynamic Development of Mining Technical Systems.

Keywords

Experimental studies, granular quartz, blasting, divided charge, air gap, specific consumption of explosives, sieve analysis, flat charge system.

Issue number: 10
Year: 2017
ISBN:
UDK: 622.235
DOI: 10.25018/0236-1493-2017-10-0-178-185
Authors: Sokolov I. V., Smirnov A. A., Rozhkov A. A.

About authors: Sokolov I.V., Doctor of Technical Sciences, Head of Laboratory, e-mail: geotech@igduran.ru, Smirnov A.A., Candidate of Technical Sciences, Senior Researcher, Rozhkov A.A., Junior Researcher, Institute of Mining of Ural Branch, Russian Academy of Sciences, 620075, Ekaterinburg, Russia.

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