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Method for blasting centralized recovery lag jambs in several times

A pillar and concentration technology, applied in the field of open-field mining, can solve problems such as waste of resources, achieve efficient recycling, and improve operating efficiency

Inactive Publication Date: 2016-11-16
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in most of the mines in our country, in order to pursue short-term economic benefits, the ore pillars are usually left to support the goaf after the mine is recovered. As the mine continues to be mined deep, a large number of lagging ore pillars will be left behind , resulting in a waste of resources

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  • Method for blasting centralized recovery lag jambs in several times
  • Method for blasting centralized recovery lag jambs in several times

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Embodiment Construction

[0014] The present invention will be further described below through specific embodiments and in conjunction with the accompanying drawings.

[0015] The recovery object is the stranded ore pillar in the goaf of the polymetallic mine in the Xiaotieshan mining area of ​​Baiyin City, Gansu Province. The rock hardness is about 6-8.

[0016] (1) Segmentation: select two adjacent ore pillars 1 as a blasting unit in the mined-out mine house through the ventilated pedestrian patio outside the vein, such as figure 1 As shown, from the top of the pillar 1, the pillar 1 is divided into four sections in the height direction, each section is 10m, and from top to bottom are the first section 2, the second section 3, the second section The third segment 4 and the fourth segment 5.

[0017] (2) Arrange the blasting structure: such as figure 2 As shown, a rock drilling roadway 6 is excavated along the length direction of the ore pillar 1 at the lower end of each segment and in the center o...

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Abstract

The invention provides a method for blasting centralized recovery lag jambs in several times. The method mainly comprises the steps that the recovered jambs are divided into four sections in the height direction, a drilling drift is dug in the length direction of the jambs, a plurality of drilling crossdrifts perpendicular to the drilling drift are dug in the width direction of the jambs, and the drilling crossdrifts penetrate through the jambs; sector-shaped blasting holes which radiate upwards with the cross sections of the drilling crossdrifts as the circle center are formed above the drilling crossdrifts, and the mined areas on the two sides of the jambs are used as the free faces of blasting; the highest section is blasted first, caved mineral ores are used as a buffering layer, and ore removal is not conducted temporally; then secondary blasting is conducted, the rest sections are blasted at a time; and ore removing is conducted after blasting is over. The jambs are spallationd in several sections and times, the mineral ore buffering layer is formed first, secondary blasting is conducted to cave the upper mineral ores at a time under the protection of the buffering layer, and potential safety hazards caused by large-scale mineral ore caving and ore dilution caused by collapse of hanging side and heading side surrounding rock are also avoided.

Description

technical field [0001] The invention belongs to the technical field of open-field mining, and relates to a method for recovering stope pillars, in particular to a method for collectively recovering pillars after forming a buffer layer by staged blasting. Background technique [0002] In open-pit mining, the stope is usually divided into mine rooms and ore pillars, and the ore pillars are recovered after mining in the mine rooms. However, in most of the mines in our country, in order to pursue short-term economic benefits, the ore pillars are usually left to support the goaf after the mine is recovered. As the mine continues to be mined deep, a large number of lagging ore pillars will be left behind , resulting in a waste of resources. Contents of the invention [0003] Aiming at the defects in the prior art, the present invention provides a method for recovering lagging ore pillars by staged and staged blasting of ore pillars and reasonable distribution of blast holes. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/22
CPCE21C41/22
Inventor 刘涛郭生茂焦满岱柴衡山孟慧媚张睿雷明礼严文炳郝显福张海磊
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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