Blasting ignition method of fan-shaped medium-length hole

A fan-shaped medium-deep hole and detonation method technology, which is applied in blasting and other directions, can solve problems such as large differences in ore block size, unfavorable ore drawing, and large amount of explosives, so as to increase recovery, reduce secondary hazards, and optimize the action process. Effect

CN107525443AInactive Publication Date: 2017-12-29NANJING MEISHAN METALLURGY DEV +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-12-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a blasting ignition method of a fan-shaped medium-length hole. The blasting ignition method comprises the steps that blast holes at the same row are divided into two sets, the deepest one third of blast holes located in the middle are a set A, and the rest of the blast holes located in the two sides are a set B; the blast holes of the set A are firstly ignited in the blasting process, and then the blast holes of the set B are ignited. The blast holes in the set A are sequentially provided with lower-section high-precision blasting caps at intervals of 25 milliseconds, the blast holes in the set B are sequentially provided with high-section high-precision blasting caps at intervals of 25 milliseconds, and meanwhile the time delay of 300-350 milliseconds is maintained between the maximal blasting cap section in the set A and the minimal blasting cap section in the set B. According to the blasting ignition method of the fan-shaped medium-length hole, energy released by explosive explosion is sufficiently utilized to break rocks and apply work, the ore rock fragmentation after blasting is improved, the ore recovery rate is increased, and meanwhile the secondary blasting harm is reduced.
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Description

Technical field:

[0001] The invention relates to a blasting initiation method for a fan-shaped medium and deep hole, which belongs to the technical field of underground mining. Background technique:

[0002] Blasting in underground mining is a very important part of the entire mining process. On the one hand, it is necessary to ensure that the ore rock mass after blasting meets the design requirements, and to create a good foundation for the subsequent links of mining resources; on the other hand, it must be fully utilized The energy released by the explosive explosion is used to break the rock and do work to reduce secondary hazards, such as the destruction of underground facilities by shock waves and the damage to structures on the ground by seismic waves. In mines that use the pillarless sublevel caving method, the method of blasting the ore is the upward fan-shaped medium-depth hole millisecond squeeze blasting. Its characteristic is: when the blasting is carried out, conside...

Examples

Embodiment Construction

[0013] The following specific embodiments will further clarify the present invention. It should be understood that the following specific embodiments are only used to illustrate the present invention and not to limit the scope of the present invention.

[0014] A method of blasting initiation of sector-shaped medium and deep holes. The method is to divide the blast holes in the same row into two groups, the deepest third of the blast holes in the middle are group A, and the other blast holes on both sides are group B ; In the process of blasting, let the A group blast hole detonate first, and the B group blast hole detonate later.

[0015] In the blasting method of the sector-shaped medium and deep holes described in this embodiment, each blast hole in the A group is sequentially installed with a low-segment high-precision detonator with an interval of 25 milliseconds, and each of the B group High-precision detonators are installed in the blastholes with an interval of 25 milliseco...