A channel blasting method for thick and large ore bodies
A technology of thick and large ore bodies and slotting, which is applied in blasting and other directions, can solve the problems of high cost, long period, and low efficiency of slotting, and achieve the effect of low cost, short cycle and high efficiency
Active Publication Date: 2021-02-09
NANJING MEISHAN METALLURGY DEV
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Problems solved by technology
The common method of grooving is to excavate a cutting patio, and realize the grooving with the help of the compensation space of the cutting patio. This method is costly, long in cycle, and low in efficiency of grooving
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[0022] The present invention will be further illustrated below in conjunction with specific embodiments, and it should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.
[0023] Thick and large ore body slotting blasting method of the present invention, the method comprises the following steps:
[0024] (1) Blast hole design and construction:
[0025] With a layer height of 15m and an approach distance of 20m, the deepest slotted hole in the ore body is two layered heights, the width of the slotted layer connection road is 5.5m, and the roadway height is 4.1m. -100 type rock drilling machine falling parameters as an example.
[0026] According to the positions of the cover layer 1 in the mined-out area and the decommissioned layered route 2, the crack hole 8 is selected directly below the decommissioned layered route, and the cracks and grooves formed after ...
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The invention provides a channel blasting method for thick and large ore bodies. The method of the present invention comprises the following steps: (1) design and construction of blastholes; (2) blasting of cracked holes and formation of cutting seams; (3) blasting of cracked holes and release of compensation space step by step; (4) blasting of vertical holes and Gob penetration of the upper layer: When the counter-cracking hole becomes a vertical hole, the penetration distance between the bottom of the blast hole and the upper layer reaches the minimum, and the bottom blasting is used to enhance the working ability of the bottom blasting in the vertical hole, so that it is compatible with the mining of the upper layer. (5) Judgment of the blasting effect of slotting: the blasting effect of cracked holes, multiple paired holes, and vertical holes can be judged by the volume of caving diamond-shaped ore bodies, the volume of transferred caving ores, and the ore volume. Judging the slotting by the phenomenon of grade depletion. Compared with the traditional method, the notching efficiency of the invention is high, the period is short, the cost is low, and it does not involve side work and is safer and operable.
Description
technical field [0001] The invention relates to a channel blasting method for thick and large ore bodies, which belongs to the technical field of underground medium and deep hole blasting. Background technique [0002] When the ferrous metal mines mined by the sub-level caving method without pillars enter a new mining level, the first thing to do is to cut and pull grooves to create a free surface for upward and middle-depth hole blasting. The commonly used method of grooving is to excavate a cutting patio, and the grooving is realized with the help of the compensation space of the cutting patio. This method has high cost, long cycle and low grooving efficiency. Especially for thick and large ore bodies with an average thickness greater than 40m, it is completely possible to optimize the channeling method by arranging suitable inclined holes and selecting a suitable charge structure according to the channel layering and the roadway position relationship of the layering on th...
Claims
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IPC IPC(8): F42D1/00F42D3/04
CPCF42D1/00F42D3/04
Inventor 李正刚吴荣高邱海涛杨潘磊
Owner NANJING MEISHAN METALLURGY DEV