Method for recycling ore pillars by middle-deep hole and deep hole united blasting technique

A deep hole and pillar technology, applied in blasting, ground mining, earthwork drilling and mining, etc., can solve the problems of hidden safety hazards, low recovery rate, large loss index, etc., achieve less engineering investment, lower dilution rate, highly operable effect
CN102808622AActive Publication Date: 2012-12-05NORTHWEST RES INST OF MINING & METALLURGY INST
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Patent Information

Authority / Receiving Office
CN Ā· China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHWEST RES INST OF MINING & METALLURGY INST
Publication Date
2012-12-05

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Abstract

The invention discloses a method for recycling ore pillars by a middle-deep hole and deep hole united blasting technique. The method comprises the following steps: arranging middle-deep hole drilling drifts on barrier pillars of a worked-out chamber; arranging a plurality of rows of middle-deep hole blast-hole sets on the walls of the middle-deep hole drilling drifts; arranging a cutting slot gate way in each middle-deep hole drilling drift, and arraying a plurality of groups of blast-hole sets in the cutting slot gate way; excavating a deep hole drilling drifts in top pillars and arranging a plurality of rows of deep hole blast-hole sets on the walls of the deep hole drilling drifts; arranging nonel detonators on the bottoms of the middle-deep hole blast holes and the middle parts of the deep hole blast holes; using a complex network structure to be connected with the blast holes; using non-electric nonel detonators to detonate the main detonating cord for detonation, and detonating branch detonating cords by the main detonating cord; transmitting detonation wave to each non-electric millisecond detonator section by the connected detonators, and controlling each row of blast holes to detonate in sequence to complete ore pillar detonation; and recycling the detonated ore pillars after ventilation. With the adoption of the method, the barrier pillars and top pillars above the bottom pillars can be once detonated, thereby rate of ore dilution is reduced and the recovery rate is improved.
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Description

technical field

[0001] The invention belongs to the technical field of underground mines, and relates to a method for recovering ore pillars in underground mines, in particular to a method for recovering ore pillars by medium-deep hole and deep hole combined blasting technology, which is used to recover the space pillars left after mining by open-field method and top pillars. Background technique

[0002] my country's metal mines generally adopt the open-field mining method, and most of the mines have left a large number of spacers and top columns after mining. In order to make full use of resources, it is necessary to reclaim these inter-pillars and top pillars. Usually, the inter-pillars and top pillars are recovered according to the recovery sequence of "first the top pillar and then the inter-pillar". Large, low recovery rate, and potential safety hazards. Contents of the invention

[0003] In order to overcome the above-mentioned problems in the prior art, the objec...

Claims

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