RU2272137C1 - Method for thick gently sloping potassium formation development - Google Patents

Abstract

FIELD: mining, particularly to develop thick gently sloping potassium-salt formations.

SUBSTANCE: method involves contouring excavation block with development entries; cutting block stock in chambers along with yielding pillars establishing between the chambers. Drive extending from development entry is formed before block stock development and chambers are excavated with the use of mining machine from the drive in cuts beginning from lower sylvinite layer. The development is carried out in layers. Each layer is developed in cuts having volume equal to halite or sylvinite volume to be loaded in vehicle along layer having the greatest thickness. Cut sylvinite is supplied to day surface, cut halide is used as filling material for adjacent worked-out chamber filling.

EFFECT: increased quality of sylvinite ore and increased reliability of mine roof control.

3 dwg

Description

The present invention relates to the mining industry and can be used in the development of powerful gentle flat potash-salt formations.

There is a method of mining powerful potassium flat beds [Gorny Zhurnal, issue 11-12, Moscow, 1998], which includes contouring the excavation block with preparatory workings, then mining the block with cameras, leaving pliable interchamber pillars (pp. 80-83).

The disadvantage of this method is that the chambers use a gross recess of the sylvinite interlayers and other interlayers that are part of the potash formation, which negatively affects the quality of the mined sylvinite ore.

A known method for the development of shallow adjoining potash beds [RF Patent No. 2099526, Cl. E 21 C 41/20], adopted for the prototype, including the advanced mining of one of the layers, the extraction of minerals by cameras and the formation of compliant interchamber pillars.

The disadvantage of this method is the use of gross excavation of sylvinite interlayers, which increases the cost of beneficiation of ore mined, as well as an insufficiently reliable way to control the roof in the chambers.

The technical result of the invention is the elimination of these drawbacks, namely the creation of a more economical and safe way to develop powerful shallow potash formations, which allows to selectively process interlayers of sylvinite ore, with a more reliable way to control the roof in the chambers.

The technical result is achieved by the fact that in the method for developing powerful shallow potash seams, including contouring of the excavation block with preparatory workings, mining the block reserves with chambers, leaving inter-chamber compliant pillars, in which according to the invention, before the reserves are worked out in the chamber, the arrivals and chambers are mined a combine harvester from the entry with starts, starting from the lower sylvinite layer, while mining is conducted in layers, and inside the layer with fillings equal to the fill beaten-off halite or sylvinite of the vehicle along the most powerful layer, and the beaten-off sylvinite is given to the surface, and spent halite is used as filling material in the adjacent spent chamber.

The proposed technical solution will improve the quality of mined sylvinite ore, as well as more reliable control of the roof in the treatment chambers.

The invention is illustrated by drawings, where in Fig.1 shows a schematic process diagram of a selective chamber recess; figure 2 is a section along aa in figure 1; figure 3 is a section along bb in figure 2.

In the drawings:

1 - upper sylvinite layer;

2 - halite layer;

3 - lower sylvinite layer;

4 - mining combine;

5 - vehicle;

6 - practiced camera;

7 - preparatory development;

8 - race;

9 - camera with a bookmark;

10 - spent camera;

11 - malleable between chamber pillars.

I, II, III - the sequence of layers being worked out.

The method is as follows.

During the development of powerful shallow potash formations, a mining block is being prepared by means of preparatory workings. Then, from the preparatory mine 7, a mining combine 4 (for example, a JOY 14CM Continuous Miner combine) passes along the sylvinite 3 layer with a capacity of m _from run 8 and the chamber 6 is worked out in layers, in ascending order, starting from the bottom layer of sylvinite 3 until until the vehicle 5 is filled with minerals. The beaten sylvinite ore is delivered to the preparatory mine by means of a vehicle 5, to which the beaten ore comes from the mining combine 4, and the ore is sent to the surface through the mine network. Next, they make a call through the halite layer 2 with a capacity of m _g until the vehicle is filled with 5 rock, and the broken rock mass is used as filling material in the previously worked out chamber 10. Between the chambers, malleable inter-chamber pillars 11 are left between the chambers. along sylvinite layer 1 with a thickness of m _s , a broken sylvinite also protrudes to the surface.

The practice of sunset is necessary in order to speed up the process of laying the mined-out space of the chamber 10, which, in turn, will allow timely and efficient management of the roof in the mined-out space. In turn, the amount of entry determines the volume of the vehicle 4, and since the power of the layers to be removed can be different, and the coefficient of loosening of halite and sylvinite is the same, then the most powerful layer is taken as a guide so that the chamber is worked out in layers uniformly.

After mining chamber 6 is finished, mining of the next chamber is started, while chamber 10 will be partially laid with halite removed from chamber 6, which will allow changing the nature of the roof lowering in chamber 10, which, in turn, will favorably affect the mining of the field, since lowering overlying rocks will occur more smoothly, which means it will be possible to avoid violation of the water-proof stratum in deposits of this type. Chamber 6 will then become the site for laying halite, repelled in the next chamber.

The proposed invention will improve the quality of mined sylvinite ore due to layer-by-layer selective mining, as well as more reliable control of the roof in the treatment chambers.

Claims (1)

A method for developing powerful shallow potash seams, including contouring of a mining block with preparatory workings, mining block reserves with chambers, leaving inter-chamber compliant pillars, characterized in that before mining reserves in the chamber, they drive through and work out the chambers with a combine harvester from the run-ins starting from the lower layer of sylvinite, while mining is carried out in layers, and inside the layer with fillings equal to the filling with broken halite or sylvinite of the vehicle and at most powerful layer being chipped sylvinite give the surface, and the exhaust halite is used as a packing material in the next waste chamber.

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