Recycling process of remaining interstall pillars of two-step mining method

Abstract

The invention discloses a recycling process of remaining interstall pillars of a two-step mining method. The recycling process comprises two circulations of stoping and filling, so as to reduce the exposure height of filling bodies and surrounding rock of the top wall and the bottom wall, and to prevent dilapidation of the filling bodies and the surrounding rock of the top wall and the bottom wall. Bilateral entrance drilling-blasting is adopted. Places near the filling bodies of a mining room adopt a short delay presplitting blasting method which requires drilling more holes and filling fewerexplosives to reduce shaking of and destruction to the filling bodies of the mining room caused by explosion. A part of the ore, to be used as a temporary support, is retained in diggings during stoping. Rock drilling and ore removal are conducted in a roadway. Staff does not need to enter into the stope, so stoping safety is good, and production capability of ore blocks is high. The stoping is conducted from bottom to top, and then cemented filling is carried out with low-grade ore tailings. The recycling process effectively controls ground pressure in the mining stope. The stope roof, the top wall and the bottom wall and the filling bodies basically remain stable in the process of stoping and filling. The recycling process has the characteristics of being safe, efficient, low in cost and low in dilution loss, so the recycling process is especially suitable for the recycling of remaining interstall pillars which are difficult to exploit by using the two-step filling method for thickand large ores of metal mines with complex conditions.

Description

technical field [0001] The invention belongs to the field of mining engineering, and in particular relates to a recovery process for the left studs of a two-step mining method. Background technique [0002] Thick and large ore bodies in metal mines with complex conditions are usually mined by two-step filling method, and the inter-pillar ore volume accounts for 30% to 60% of the total ore volume in the mining area. It is relatively easy to achieve safe, high-efficiency, and low-cost mining goals in one-step mine mining, but the one-step mining will damage the interstitial pillars, and the filling bodies on both sides of the interstitial pillars are generally poor in self-stability, which makes the second-step interstitial pillar recovery When the safety conditions become worse and the mining process becomes complicated, some difficult-to-mining studs will be left behind, so the resource recovery rate and production efficiency of mining enterprises will be significantly reduc...

AI Technical Summary

Problems solved by technology

It is relatively easy to achieve safe, high-efficiency, and low-cost mining goals in one-step mine mining, but the one-step mining will damage the interstitial pillars, and the filling bodies on both sides of the interstitial pillars are generally poor in self-stability, which makes the second-step interstitial pillar recovery When the safety conditions become worse and the mining process becomes complicated, some difficult-to-mining studs will be left behind, which will significantly reduce the resource recovery rate and production efficiency of mining enterprises, lag in recovery, and deteriorate the economic benefits of enterprises.

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