Improved sublevel caving method without bottom column

A segmented caving method without pillars, which is applied in ground mining, earth drilling, underground mining, etc., can solve the problems of increasing mine construction investment intensity, large ore dilution, and low mining intensity, so as to eliminate blasting The effect of partition wall accident, increasing the amount of ore mined, and improving the ore recovery rate

Inactive Publication Date: 2009-09-02
NORTHEASTERN UNIV LIAONING
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  • Description
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  • Application Information

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Problems solved by technology

The traditional pillarless sub-caving method has disadvantages such as large ore dilution, difficult ventilation and low mining intensity, while the pillarless sub-caving method with large structural parameters needs to be equipped with high-power equipment, which inevitably requires more technical equipment. At the same time, it will inevitably increase the investment intensity of mine construction, so it is difficult to be popularized in developing countries, so it is not suitable for the development of mining industry in my country and developing countries.

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  • Improved sublevel caving method without bottom column
  • Improved sublevel caving method without bottom column
  • Improved sublevel caving method without bottom column

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Embodiment 1

[0042] An iron mine in Handan City, Hebei Province, most of the ore structure is loose and broken, easy to fall, suitable for use figure 2 The stope structure, the present invention draws up the following mining scheme for this reason:

[0043] Taking the middle section of the first 50 meters of the mine as the middle section of the first mining, the height of the induced caving area is designed to be 28-45m, and the distance between the routes is 18m; The area height is 15m, and the approach distance is 9m. Use QZG80A type medium and high wind pressure down-the-hole drilling rig to drill rock, 4.0m 3 Electric shovel out of the mine, the access section height × width is 3.5 × 4.2m 2 .

[0044] After implementing the present invention, the mining heap coefficient of the main mining area is reduced from the original 3.6m / KT to 2.07m / KT, the production efficiency is 60,000 tons / month, the ore recovery rate reaches 92.5%, and the ore dilution rate is 11%. about. In the case ...

Embodiment 2

[0046] A medium-thick ore body in the west of an iron mine in Hebei Province, the ore is unstable to moderately stable, and the mining ground pressure is large. Since the ore is easy to fall and the size of the fall is small, only the induced fall area and the bottom recovery area are set up. The overall design scheme is as follows Figure 6 shown. The height of the induced caving area is designed to be 10-25m, and the approach distance is 16m; the height of the recovery area at the bottom is 10m, and the joint layout of the dense approach and the recovery approach is adopted, and the approach distance is 8-16m; the rock cutting height of the recovery approach (calculated from the roadway roof) is 2 ~ 5m. Adopt QZG80A medium and high wind pressure down-the-hole drilling rig for rock drilling, bucket capacity 4.0m 3 Electric shovel out of the mine, the access section height × width is 3.5 × 4.2m 2 . Experimental research shows that the ore recovery rate is about 85%, and th...

Embodiment 3

[0048] The scheme drawn up for an iron mine in Anshan Iron and Steel Co., Ltd. to convert from open pit to underground mining. The ore body of this mine is thick and large, the dip angle is steep, the Platinum hardness coefficient f=12-14, and the fault structure of the ore deposit is developed, which is suitable for mining Figure 7 Mining plan.

[0049] A technical scheme has been designed to transform from deep concave open-pit mining to simultaneous open-pit and underground mining, and then transition to underground high-efficiency mining. Underground mining adopts imported high-power rock drilling and mining equipment. Figure 7 In the stope structure shown, the height of the induced caving area is 50-120m, and the approach spacing is 20-25m; the section height of the normal mining area is 20-30m, and the approach spacing is 20-25m; the bottom recovery area adopts dense access Form whose height is the height of one segment. For the sake of safety, at least one monitorin...

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Abstract

An improved segmental caving method without pillars, which includes segmental mining, rock drilling in the approach, blasting and ore extraction, and is characterized in that the ore body is divided into an induced caving area and a normal mining area from top to bottom and the bottom recovery area to carry out operations separately in sequence. The purpose of blasting mining in the induced caving area is mainly to provide support between the caving routes and induce the natural caving of the upper ore; in the normal mining area, blasting recovers the ore in this area and receives the upper caving ore at the same time; The recovery of the amount and the recovery of the ore near the floor or the footwall. The invention divides the original same ore section into upper and lower areas, and carries out back mining by combining induced caving and blasting caving, ore falling, low-dilution ore drawing, and recovery section at the bottom. The invention also improves the arrangement of fan-shaped blastholes, charge structure and detonation mode, and proposes a grouped multi-stage micro-differential detonation scheme. Popularizing the invention can realize the mining target of "four lows and one high", and has very good benefits.

Description

technical field [0001] The invention belongs to the technical field of underground mining methods, that is, it provides an improved underground mining method of sub-column-free bottom-pillar sub-caving combining induced caving and blasting caving. Background technique [0002] Underground mining methods include three basic processes of mining, cutting and back mining. Usually, it can be divided into three categories: open-field mining method, filling mining method and caving mining method. The pillarless segmented caving method in the caving mining method is recognized as one of the best mining methods for mining thick and large ore bodies. It has been widely used in the world and is developing in the direction of large structural parameters. Pillarless segmental caving method is to divide the stage into several segments with segmental mining roadway, and carry out mining segment by segment from top to bottom. The bottom structure of the mine is not set in the lower part of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/16
Inventor 任凤玉
Owner NORTHEASTERN UNIV LIAONING
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