Large dead zone residual ore recovery method

Abstract

The invention relates to a recovery method of residual ores in a large mined out space. The method comprises the steps of sublevel caving method without sill pillar, rock drilling and blasting in an inlet passage and ore removal; and is characterized in that: forced caving and induced inbreak are adopted by ore break down, a recycling inlet passage is arranged at the bottom of the mined out space, residual orebody inside and at the periphery of the mined out space to be recycled is divided into an induced inbreak area and a forced caving area from top to bottom, the continuous mined out space formed after the blasting is utilized to induce the inbreak of the ore at the upper part, and the recycling inlet passage is arranged in the ore body at the lower part of the mined out space. The method solves the problems of poor safety condition and low recovery rate and the like of the traditional residual ore recovery in the mined out space, realizes high degree of safety, low production cost and high recovery rate and the like of the residual ore recovery, and improves the production efficiency and economic efficiency of mines.

Description

Technical field [0001] The invention relates to underground mining technology, in particular to a method that can safely and efficiently recover residual ore in a large empty area. Background technique [0002] At present, the known method of recovering the residual ore caving in large empty areas is to leave part of the roof pillars and inter-pillars to support the roof of the empty area, use the original excavation roadways and empty areas, and use medium-deep holes to sink the ore in the lower part of the empty area. The footwall is made of artificial concrete or steel sheds to form the mine veins, and the mine funnels are arranged in both directions of the veins. Due to mining under an empty field, personnel need to enter the empty area for operation, and the safety conditions are poor; a certain number of ore pillars are reserved to support the roof of the empty area, only part of the pillars can be recovered, and most of the residual ore is difficult to recover, and the rec...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of poor construction safety conditions, high mining cost and low recovery rate of the existing large-scale empty area residual ore recovery method, and provide a large-scale empty area residual ore recovery method, that is, forced caving and induced caving, The recovery approach is set up without pillar sub-section caving method. This recovery method can not only improve the operating safety conditions, but also reduce mining costs and increase the recovery rate of residual ore

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