Pretreatment method for ore rock

A technology for pretreatment and ore rock, which is used in surface mining, earthwork drilling, underground mining, etc., can solve the problems of hydraulic fracturing ore rock pretreatment method to be improved, and achieve good improvement effect and reduce caving ore rock blocks. degree, the effect of increasing the degree of development

Inactive Publication Date: 2018-12-18
CHINA ENFI ENGINEERING CORPORATION
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] Therefore, the hydraulic fracturing ore rock pretreatment method needs to be improved

Method used

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  • Pretreatment method for ore rock
  • Pretreatment method for ore rock
  • Pretreatment method for ore rock

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Embodiment 1

[0056] Utilize the method for the embodiment of the present invention to carry out the method for pretreatment of stope ore as follows:

[0057] 1. According to the design plan of the natural caving mining method, the corresponding stope project is formed. The structure of the stope is as follows figure 2 As shown, it mainly includes the bottom-drawing level (composed of bottom-drawing tunnels), the bottom ore outlet structure (composed of ore-collecting system and ore-out approach, generally in the form of a funnel or ore-accumulating trough, and the ore-out approach is generally Arranged in a herringbone style) and along the main transport alley. There are vein-piercing roadways and vein-along roadways arranged horizontally on the upper part of the ore blocks in the stope. The height of the ore blocks varies, up to hundreds of meters or even hundreds of meters; the vein-piercing roadways are arranged along the direction of the ore body, with an interval of about 50 meters. ...

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Abstract

The invention discloses a pretreatment method for an ore rock. The method includes: forming a plurality of cracking holes in the ore rock; forming guiding grooves on the inner walls of the cracking holes, wherein the guiding grooves are circumferentially disposed along the inner walls of the cracking holes; and fracturing the cracking holes in order to cause the ore rock to produce directional fractures. By forming the cracking holes in the ore rock, forming the guiding grooves on the inner walls of the cracking holes, and injecting a high-pressure fracturing fluid to cause the ore rock to produce directional hydraulic fractures under the action of the guiding grooves, the development degree of the fractures inside the rock mass of the ore rock can be increased, and the problems of poor collapsibility of the ore rock and large size of the caved ore rock when a natural caving mining method is applied to medium hard rock, hard rock, highly-hard rock and other high-hardness metal mines can be solved.

Description

technical field [0001] The invention relates to the field of mining, in particular to a pretreatment method for ore rocks. Background technique [0002] The key to the successful application of natural caving mining method in hard rock metal mines is the caving property of ore rock, which can be improved by hydraulic fracturing ore rock pretreatment technology. The hydraulic fracturing ore rock pretreatment technology is derived from the hydraulic fracturing technology in the petroleum and shale gas fields. At present, some foreign hard rock metal mines that adopt natural caving mining (such as the Northparkes mine in Australia, the East Cadia mine in Australia, the El Teniente mine) has been explored experimental research on hydraulic fracturing ore rock pretreatment and achieved certain results. Existing hydraulic fracturing ore rock pretreatment technology usually injects high-pressure water into intervals in vertical or inclined holes for hydraulic fracturing. Since the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/22E21C37/12
CPCE21C37/12E21C41/22
Inventor 刘育明李文陈小伟夏长念赵战锋范文录
Owner CHINA ENFI ENGINEERING CORPORATION
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