Medium-length hole blasting method used for underground mining

Abstract

The invention belongs to the technical field of mining, and particularly relates to a medium-length hole blasting method used for underground mining. According to the method, blast holes are distributed in a fan shape, detonators are simultaneously buried in the middles and at the bottoms of the blast holes, the mode that delayed blasting is carried out from the middle to two sides simultaneously and every two rows of blast holes are taken as one group and are sequentially blasted is adopted in the blasting method, the blasting effect is obviously improved, the block rate is substantially reduced, and the ore removal efficiency is obviously improved. Compared with a traditional blasting method, the blasting method reduces the block rate from 27.6% to 6%, the ore removal efficiency of an ore removal equipment scraper is raised from 58 tons per machine team to 122 tons per machine team, the ore removal cost is reduced from 13.63 RMB per ton to 11.53 RMB per ton, recrushing times are substantially reduced and operation safety is guaranteed.

Description

Technical field [0001] The invention belongs to the technical field of mining, and specifically relates to a medium-deep hole blasting method for underground mining. Background technique [0002] The effect of the blasting effect directly affects the mining efficiency, mining loss rate, dilution rate, mining grade, and mining cost of mining equipment. Improving the blasting effect is of great significance for ensuring production safety, reducing production costs, reducing losses and dilution rates, and improving the grade of mined ore. [0003] The traditional downward subsection caving mining method has a stage height of 60 meters, a section height of 12 meters, and a stoping approach distance of 11 meters. The mining is carried out from top to bottom according to the section height; the construction caving range in the stoping approach roadway is horizontal The direction is between the two mining access roads, and the vertical direction is from the hole angle of the lowest side ...

AI Technical Summary

Problems solved by technology

A row of medium and deep holes is blasted each time; the detonation gas leaks at the moment of detonation, and the action time is short, which is not conducive to the full crushing of the ore rock at the bottom of the hole, and the output rate of large pieces is high; large pieces need to be crushed twice to normal size It can be shipped only after the large pieces are broken, and part of the pyrotechnic materials will be consumed to break the large pieces, which not only increases the mining cost, but also reduces the mining operation time; The disadvantages of high mine cost cannot meet the needs of mine safety production

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