Millisecond blasting ore-waste separating method of gentle-inclined narrow ore body

Abstract

The invention relates to a millisecond blasting ore-waste separating method of a gentle-inclined narrow ore body. The method comprises the steps of: respectively drilling ore blast-holes and barren rock blast-holes in an ore body and a barren rock once at a time, with the array pitches of the blast-holes being 0.6-0.8m, the distances of the blast-hole being 0.5-0.7m and the depths of the blast-holes being 1.2-2.0m; selecting explosive loading quantity of the ore blast-hole to be 0.75-0.9kg per hole, and selecting the explosive loading quantity of the barren rock blast-hole to be 1.0-1.15kg per hole; adopting non-electric detonator millisecond blasting, wherein the blasting time difference is 0.5-1 second, and blasting all barren rock blast-holes before the first ore blast-hole, wherein the blast-hole blasting order is from bottom to top and from outside to inside. By adopting the blasting parameters, non-electric detonator millisecond blasting and segment blasting, the ore and barren rock throwing distances can be controlled; the ore and barren rock are separated; the impoverishment rate in mining is reduced; the grade of mined raw ore is improved; discharge of the barren rock is reduced; and the grade of the raw ore, and the utilization rate and recovery rate of the resource are improved, and composite economic results of enterprises are increased.

Description

technical field [0001] The invention relates to a mining method, in particular to a method for separating ore waste from micro-differential detonation of a gently inclined thin ore body. Background technique [0002] Due to the non-renewable mineral resources, especially the sharp rise in the price of non-ferrous metals in recent years, some low-grade and thin ore bodies are being exploited and utilized by mining enterprises. At present, the full-scale mining method or room-and-pillar mining method is used to mine gently inclined thin ore bodies with an ore body dip angle between 0°-30° and ore body thickness within 1 meter. However, when mining a thin ore body with a thickness of less than 1 meter, according to the man-machine function, the operating height must be at least 1.8 meters, that is to say, the mining height must be at least 1.8 meters, and the dilution rate is high, as high as 45%, and the ore grade will be greatly reduced after dilution. , and even fail to rea...

AI Technical Summary

Problems solved by technology

However, when mining a thin ore body with a thickness of less than 1 meter, according to the man-machine function, the operating height must be at least 1.8 meters, that is to say, the mining height must be at least 1.8 meters, and the dilution rate is high, as high as 45%, and the ore grade will be greatly reduced after dilution. , not even up to the grade of industrial utilization

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