Blasting method capable of improving step deep-hole blasting quality by using auxiliary blasthole

A technology of deep hole blasting and blast hole, which is applied in the field of blasting, and can solve problems such as high large block rate and affect the normal operation of mine production, and achieve the effects of reducing large blocks, improving blasting quality, and increasing energy utilization rate
CN105202984AInactive Publication Date: 2015-12-30NORTHWEST RES INST OF MINING & METALLURGY INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHWEST RES INST OF MINING & METALLURGY INST
Publication Date
2015-12-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the technical field of blasting methods, and particularly relates to a blasting method capable of improving step deep-hole blasting quality by using an auxiliary blasthole, which comprises the following steps: determining the auxiliary blasthole, determining the depth of the auxiliary blasthole, selecting different explosives for the blasthole, and determining the detonation mode. The auxiliary blasthole 2 is arranged between the deep-hole blastholes, thereby solving the problem of overhigh bulk rate on the step upper part due to the overhigh blasthole blockage length, overlow charging center of gravity and other conditions in production. The vertical blasthole-oblique blasthole combination mode is adopted to effectively improve the blasting quality on the premise of not influencing the perforation-blasting combined efficiency. According to the principle that the diameter of the blasthole should be approximate to or slightly greater than the limit diameter of the explosive, different explosives are selected for the auxiliary blasthole 2 and main blasthole 1, thereby creating ideal detonation conditions for the explosives and enhancing the energy utilization efficiency of the explosives.
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Description

Technical field

[0001] The invention belongs to the technical field of blasting methods, and particularly relates to a blasting method for improving the quality of stepped deep hole blasting by using auxiliary blast holes. Background technique

[0002] The high block rate during step deep hole blasting is a common problem in open-pit mines, which seriously affects the normal operation of mine production. In practice, it is found that due to the fact that the length of the blast hole blockage is too large and the center of gravity of the charge is low in actual production, the upper part of the blast hole and the orifice are less damaged by explosives, and the blast hole blockage section on the upper part of the step is large. The block rate is usually higher than other locations. Therefore, adopting appropriate measures to reduce the bulk rate of the orifice is of great significance for strictly controlling the bulk rate of step deep holes as a whole and improving the blasting q...

Claims

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