A method for recovering near-surface collapsed ore bodies

Abstract

The invention discloses a method for recovering a collapsed ore body near the surface. Firstly, the occurrence of the collapsed ore body is found out, and then the ore body is connected along the vein from one side of the collapsed ore body, and a pipe drilling rig is used to construct a vertical direction of the ore body. Row and pipe drilling, and install seamless steel pipes with round holes in the drilling. The single-liquid grouting pump is used to grout the collapsed ore body area through the seamless steel pipe, and a layer of grouting cement is formed in the upper and lower areas of the seamless steel pipe. The road-filling method is used to form a road isolation layer in the entire collapse ore body below the grouted cemented body. Then, under the protection of the overlying grouting cement and the access isolation layer, the lower collapsed ore body is recovered and the empty space is filled. The invention has the advantages of simple process and principle, low cost, high recovery rate, good safety and reliability, and the like.

Description

technical field [0001] The invention relates to the technical field of underground metal mine mining, in particular to a method for recovering a near-surface collapsed ore body. Background technique [0002] Underground mining of near-surface ore bodies is less difficult, the effect is quick, and it is easy to be stolen, and the disordered and unfilled mining in the early stage of mining can easily cause the ore rock to collapse to the surface, resulting in a large amount of ore (body) left in the internal and lower ore bodies. ) cannot be recovered, and generally the grade and value of this part of the ore body are relatively high, and the amount is relatively large. Hasty recycling will cause the surface to continue to collapse and cause irreversible impact on the environment. At the same time, the released ore is doped with a large amount of waste rock and the Quaternary, resulting in a high dilution rate of the released ore. The conventional methods of recovering this p...

AI Technical Summary

Problems solved by technology

Hasty recycling will cause the surface to continue to collapse and have an irreversible impact on the environment. At the same time, the released ore is mixed with a large amount of waste rock and Quaternary, resulting in a high dilution rate of the released ore

The conventional way to recover this part of the ore is pre-grouting secondary recovery and surface landfill underground recovery. The former requires too much slurry when the collapsed area is too large, which cannot effectively avoid the problems of slurry leakage and runaway ; the latter has the risk of depletion loss and cannot be implemented when there are fixed buildings nearby

In addition, there are methods such as in-situ leaching, all of which have problems such as high cost, low success rate, and low recovery efficiency.

[0003] In view of the shortcomings of the above methods, there is an urgent need for a method with wide application range, simple process and low cost to solve the problems of high cost, poor dilution rate control and low reliability in the recovery process of near-surface collapsed ore bodies.

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