Multilayer gently-inclined extremely-narrow vein stoping blasting technology

An extremely thin ore and gently inclined technology, applied in blasting, ground mining, earth square drilling and mining, etc., can solve the problems of reducing ore dilution rate and surrounding rock mixing, and achieve the effect of reducing dilution rate and avoiding mixing

Active Publication Date: 2014-12-17
SINOSTEEL MAANSHAN INST OF MINING RES +1
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Problems solved by technology

After the test and study of the mine's final mining method, it is determined that the bolt-rod room-and-pillar mining method has good technical and economic effects, but this method is only suitable for ore bodies with a thickness greater than 1.6m
[0005] None of the above articles has solved the problem of preventing the surrounding rock from mixing in and effectively reducing the ore dilution rate when mining extremely thin veins

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  • Multilayer gently-inclined extremely-narrow vein stoping blasting technology

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Embodiment Construction

[0022] In order to further describe the present invention, a multi-layer gently inclined extremely thin vein recovery blasting technology of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0023] Depend on figure 1 It can be seen from the blast hole layout schematic diagram of a kind of multi-layer gently inclined extremely thin vein mining blasting technology shown in the present invention that the present invention adopts top-to-bottom mining, layer-by-layer detonation from top to bottom, and each layer blasting Hole arrangements and charge forms vary.

[0024] In the present invention, a cutting roadway 4 is excavated next to the mined multi-layered veins as a compensation space when the ore body is mined. The cutting roadway 4 excavates the first layered veins 1, the rock interlayer 2, and the second layered veins 3 all at once.

[0025] Next, excavate intensive blastholes 5 at the boundary between the first...

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Abstract

The invention discloses a multilayer gently-inclined extremely-narrow vein stoping blasting technology. In the technology, a top-to-bottom layer-by-layer blasting and layered stoping method is employed. An intensive blasthole (5) are dug in a first layered vein (1) and an upper rock layer boundary. First layered vein middle blasthole (6) are dug in the middle of the first layered vein (1). A vein and intercalated rock layer boundary blasthole (7) is dug in the boundary between the first layered vein (1) and an intercalated rock layer (2). An intercalated rock layer and vein boundary blasthole (9) is dug in the boundary between the intercalated rock layer (2) and a second layered vein (3). An intercalated rock layer middle blasthole (8) is dug in the middle of the intercalated rock layer (2). A vein and lower surrounding rock boundary blasthole (10) is dug in the boundary between the second layered vein (3) and the lower surrounding rock boundary. The technology can achieve synchronic recycle of multilayer veins. A buffer seam can weaken an effect of a blasting shock wave on surrounding rock during a stoping process and meanwhile intercalated rock can be directly removed so that a difficult problem that the intercalated rock is mixed with ores and an ore dilution rate is reduced.

Description

technical field [0001] The invention relates to a blasting technique for recovering ore veins in underground mines, and is especially suitable for the mining of multi-layer, gently inclined and extremely thin ore veins in underground metal mines. Background technique [0002] Multi-layer gently inclined extremely thin veins have always been difficult-to-mine ore bodies. When multi-layer mixed mining, all interlayer rocks are mixed into the ore pile, which increases the cost of ore and waste rock separation and beneficiation in the later stage. When mining layer by layer, due to the thinner ore body, the range of blasting action is larger than the thickness of the ore body. When blasting the ore body, the surrounding rock of the ore body is often mixed into the ore pile by blasting, resulting in ore dilution. [0003] Some mines reduce the ore dilution rate in order to avoid the mixing of rocks between multi-layer veins into the ore pile. The method of "mining thick and aban...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/16F42D3/04
Inventor 孙丽军谢亮波
Owner SINOSTEEL MAANSHAN INST OF MINING RES
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