RU2232900C2 - Method for filling and protecting excavated space during subterranean excavation of mineral deposits - Google Patents

Abstract

FIELD: mining industry.

SUBSTANCE: method includes placement of dry filling material in excavated space of chamber, prior to feeding of dry filling materials tanks with fast-hardening extending liquid - polyurethane are placed there, and polymer-ore protective layer in chamber bottom is formed by means of exploding tanks with said liquid in cut ore massive by explosive charges, after which dry filling material is fed into excavated space.

EFFECT: safer operations, better quality of isolation of excavated space and absence of possibility of penetration of filling material into mines.

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Description

The invention relates to the field of mining and can be used in the elimination of voids in the underground mining of ore bodies.

There is a method of protecting undermined structures and natural objects (see as.with. No. 594339, E 21 F 15/00), which consists in the preparation of filling material, the sinking of wells and the supply of filling material.

The disadvantage of this method is the insufficient quality isolation of the worked out space and low safety of work.

Closest to the proposed technical solution is a method of laying the mined-out space of chambers during underground mining of mineral deposits (see Bookmarking economy of mines and mines. - M .: Nedra, 1978, p.60-61), including the placement of dry filling material in the worked-out space cameras.

The disadvantage of this method is the high cost of laying work, low stability of the bottom of the chambers and the possibility of penetration of filling material into the mine workings, insufficient strength of the filling array.

A single technical result is an increase in the safety of work, the quality of isolation of the worked out space and the lack of penetration of filling material into the mine workings.

A uniform technical result is achieved by the fact that in the method of laying and protecting the worked out space during underground mining of mineral deposits, including placing dry filling material in the worked out space of the chamber, before supplying dry filling material in the worked out space, containers with quick-hardening polymer expanding liquid are placed and a polymer- ore protective layer in the bottom of the chamber by blasting containers with quick-hardening polymer expanding liquid In the broken ore stratum by explosive charges of explosives, polyurethane foam is used as a polymer quick-hardening expanding liquid, after which dry filling material is fed into the worked out space.

Placing containers with quick-hardening polymer expanding liquid before feeding filling material into the worked out space and creating a polymer-ore protective layer in the bottom of the chamber by blasting containers (made, for example, of polyethylene, rubber, etc.) with quick-hardening polymer expanding liquid, ensures the creation of a reliable the barrier of penetration of the rock mass into the mine workings, and also provides a steady state of the chamber.

The use of polyurethane foam (for example, PPU-17N-1 or PPU-17N-2) as a quick-hardening polymer expanding fluid ensures the reliability of isolation of the worked out space and ensures increased safety of work.

The starting components for the production of polyurethane foam:

PPU-17N-1 - component A - A1-17N-1 and A2-17H, component B - polyisocyanate grade B or grade D.

PPU-17N-2 - component A - A1-17N-2 and A2-17H, component B - polyisocyanate grade B or grade D.

The ratio of the starting components to obtain polyurethane foam A: B is 1: 1.1.

The polymer-ore protective layer, calculated from the proposed ratio, prevents the penetration in the process of laying and subsequently filling material into the mine workings.

The proposed technical solution is illustrated by drawings, where figure 1 shows a vertical section of a chamber with placed containers before the explosion; figure 2 is a vertical section of a chamber with a protective polymer-ore layer (after the explosion).

The proposed method is as follows. In preparation for mining chamber 1 simultaneously with drilling workings 2, workings 3 pass for filling material into the worked-out space of chamber 1. On the delivery horizon, workings 4 pass for release and delivery of ore mass, as well as workings 5 for subsequent supply of containers 6 with quick-setting polymer expanding fluid (polyurethane foam). Then, the chamber 1 is drilled with deep wells and the mineral is broken off by explosive charges. After releasing most of the ore mass through the mine 5, containers 6 with quick-hardening polymer expanding liquid (polyurethane foam) are fed into the bottom of chamber 1, which are then blown using explosive microwires previously placed in containers 6. The quick-hardening polymer expanding sprayed by the explosion in the mined space of chamber 1 liquid (polyurethane foam) forms a polymer-ore protective layer 8 on the surface of the abandoned ore mass 7 together with its upper part 8. After some time, the wasp they allow the filing material 9 to be fed through the filler workings 3 into the mined space of the chamber 1.

The proposed method of laying and protecting the developed space during underground mining of mineral deposits has been tested at the Sheregesh mine (Sheregesh, Kemerovo region).

With the tab by the proposed method, 1.2 million tons of crude ore were recovered, there were no complaints on the safety of the Gosgortekhnadzor of Russia, the penetration of the stuffing material into the mine workings during mining of 3 blocks was not observed. The economic effect of the implementation of the proposed method for the Sheregesh mine amounted to more than 3.0 million rubles.

Claims (1)

The method of laying and protecting the worked-out space during underground mining of mineral deposits, including placing dry filling material in the worked-out chamber space, characterized in that prior to supplying the dry filling material in the worked-out space, containers with quick-hardening polymer expanding liquid are placed and a polymer-ore protective layer is created in the bottom of the chamber by blasting containers with quick-hardening polymer expanding liquid in the beaten ore thickness of the charge Explosives and - BB, using polyurethane foam, whereupon the dry feed packing material in the goaf as a fast-hardening resin an expanding fluid.

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