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Ore-rock boundary and blasting combined roof caving method

A combination of mining and rock technology, applied in blasting, ground mining, earth square drilling, etc., can solve the problems of high mining cost, large mixing of mining surrounding rock, low ore recovery rate, etc., to reduce the amount of excavation and save the amount of excavation , Improve the effect of resource recovery rate

Inactive Publication Date: 2020-11-17
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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Problems solved by technology

[0004] The object of the present invention is: in order to solve the problems of large mixing of mining surrounding rocks in gently inclined ore body, low ore recovery rate and high mining cost in the existing ore mining, the present invention provides a roof caving method that combines ore rock boundary and blasting. method

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  • Ore-rock boundary and blasting combined roof caving method
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[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0025] Apparently, the described embodiments are some, but not all, embodiments of the present invention. Therefore, the following detailed descriptions of the embodiments of the present invention provided in the accompanying drawings are not intended to limit the scope of the claimed invention. , but merely represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0026] The iron ore in a certain mining area belongs to a steeply inclined thick ore body, and the or...

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Abstract

The invention discloses an ore-rock boundary and blasting combined roof caving method, and relates to the technical field of mining. The problems of large surrounding rock mixing, low ore recovery rate and high mining cost in gentle dip ore body mining in existing ore mining are solved. The method comprises the following steps that firstly, an upper horizontal ore-rock boundary and a lower horizontal ore-rock boundary are drawn; a gentle dip ore body boundary surface is set; then, a triangular gentle dip ore body roof caving stoping area is delineated in the gentle dip ore body boundary surface, and a stoping drift roadway is arranged within the range of the triangular gentle dip ore body caving stoping area in the ore body trend; and a roof caving medium-length hole is formed in the stoping drift roadway in the direction perpendicular to the ore body trend, the depth of the roof caving medium-length hole is determined through the ore body inclination angle and the upper horizontal ore-rock boundary as well as the lower horizontal ore-rock boundary, the ore rock blasting boundary is controlled, and ore rock is stripped through blasting. According to the ore-rock boundary and blasting combined roof caving method, a stoping drift is arranged in the ore body trend, so that the tunneling amount, the discharge amount and the rock blasting amount of the rock roadway are reduced, themining preparation time and cost are saved, surrounding rock mixing is effectively reduced, and the resource recovery rate is increased.

Description

technical field [0001] The invention relates to the technical field of mining, in particular to a roof caving method utilizing ore-rock boundaries combined with blasting. Background technique [0002] In the mining of iron ore, the ore and surrounding rock of the steeply inclined thick ore body are stable, and the sub-level caving method without pillars is basically used for mining. However, as the mining progresses, the ore body sometimes has a tendency to slow down, forming a gently inclined ore body. The mining of ore bodies with irregular ore body boundaries and gently inclined ore bodies is a recognized mining problem in the world, and the poor stability of ore rocks further increases the difficulty of mining. [0003] In the process of mining gently inclined ore bodies by sub-level caving method without pillars, the following problems are usually encountered: First, after the thickness of the ore body becomes thinner, if the rock drilling route is arranged vertically t...

Claims

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Application Information

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IPC IPC(8): E21C41/22F42D1/00F42D3/04
CPCE21C41/22F42D1/00F42D3/04
Inventor 龚文柏李金平王旭东
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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