Method for Determining Blast Stack Width in Step Blasting in Open Pit Mine

A technology of step blasting and determination method, which is applied in blasting and other directions, can solve problems such as difficulty in predicting the width of blast piles, and achieve the effects of improving shovel loading efficiency, reducing rock stripping, and reducing mining costs

Active Publication Date: 2020-10-09
SINOSTEEL MAANSHAN INST OF MINING RES CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for determining the width of the blast stack in step blasting in open pit mines in order to solve the technical problem of difficulty in predicting the blast stack width in step blasting in existing open pit mines.

Method used

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  • Method for Determining Blast Stack Width in Step Blasting in Open Pit Mine
  • Method for Determining Blast Stack Width in Step Blasting in Open Pit Mine
  • Method for Determining Blast Stack Width in Step Blasting in Open Pit Mine

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Embodiment example

[0043] Implementation case: A large-scale open-pit iron mine with an annual output of 5 million tons, the diameter of the blast hole is 250mm, and powdery emulsion explosive is used; the hole distance during ballast blasting is 6.5m~7m, and the row distance b=5.6m~6m; ballast blasting holes The distance is 6m~6.5m, the row distance b=5.2m~5.6m; the width W of the chassis resistance line is 8m~8.5m, and the extra depth is 2m. The detonation scheme adopts slash detonation, and the number of rows of blastholes for each blasting is N=2 to 4 rows.

[0044] 1) When clearing ballast, h 1 The ratio of / W is controlled at 0.45~0.71. After a large number of field tests, the blast pile width L and h 1 / W relational equation, L=-5.2268+39.199·(h 1 / W), such as image 3 The blast pile width L and h of single-row hole blasting shown in the ballasting 1 / W diagram.

[0045] When multiple rows of holes are blasted, the blast pile width L=-5.2268+39.199·(h 1 / W)+(N-1)×5.8.

[0046] Afte...

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Abstract

The invention discloses a surface mine bench blasting muck pile width determination method. Main factors of the height h1 of an explosive charging section (3), the width W of a chassis resisting line,the slag remaining thickness S of a muck pile (5), the height h2 of a blast hole blockage section (4) and the compactness of influencing the muck pile width L of the muck pile (5) are determined. Twokey variables of the slag removing variable h1 / W and the slag remaining variable h1 / (W+S) are controlled; a calculation formula is obtained through regression of a lot of field test data; through combination of the blast hole row distance parameters, prediction of the muck pile width and verification of the field test, the blasting parameter optimization is guided according to the field conditions to prevent reverse transportation and to improve the shoveling efficiency; and under the precondition of guaranteeing the slope safety, the stripping quantity is reduced, the stope slope angle is increased, the blasting mining cost is reduced, and the excellent popularization and reference effect on mining of surface mines similar to steeps is achieved. The method can be widely applied to surface mine bench blasting of such non-coal solids as black, nonferrous and golden building materials.

Description

technical field [0001] The invention belongs to the technical field of open-pit step blasting, and in particular relates to a method for determining the width of a blast pile in steep side mining in open-pit mines, which can be widely used in step blasting in non-coal solid open-pit mines such as black, non-ferrous, gold, and building materials. Background technique [0002] The technical process of open-pit mining is generally: perforation, blasting, shoveling, transportation and rock removal. The links of each process link, influence and restrict each other, constituting the most basic production cycle of open-pit mining. Blasting is an important process in open-pit mining. Through blasting operations, the whole ore rock is broken and loosened to form a certain shape of the gun pile, which provides working conditions for subsequent mining operations. The quality of the blasting work and the blasting effect directly affect the production efficiency and cost of the subsequen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D3/04
CPCF42D3/04
Inventor 张西良刘为洲仪海豹汪禹潘祖瑛
Owner SINOSTEEL MAANSHAN INST OF MINING RES CO LTD
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