EA016183B1 - Technique of developing a thick flat potassium-bearing seam with rock salt interlayer - Google Patents

Abstract

The proposed invention provides to increase efficiency of selective technique for developing thick flat seams containing a rock salt interlayer, due to the workers' labour efficiency, and to reduce energy consumption associated with rock salt transportation. This is achieved by shearer development of a seam in chambers rising in serial stopes over layers, transporting the mineral by mobile machinery, the seam being developed in the chamber in layers, over the entire seam thickness at once, in ascending order, in short vertical stopes, beginning from the lowest layer, the stopes being performed over the layers to maximum value of the shearer operating member; when performing a stope over a rock layer interlayer, the broken salt is placed after the shearer on the ground of the chamber being developed, as a layer whose maximum depth is determined as follows:h=H-hwhere His the chamber height in the stope; his the minimum chamber height to accommodate the extraction equipment. Rock salt broken at the shearer's length from the beginning of the chamber, is placed in a previously developed chamber. Broken rock salt placed after the shearer on the ground of the chamber being developed, is leveled and rammed using mobile machinery. Stopes shall be performed over layers by reciprocating motions of the shearer.

Description

Rock salt, beaten off at a distance from the beginning of the chamber, equal to the length of the combine, is placed in the previously spent chamber. The broken rock salt, placed after the combine on the soil of the mined chamber, is leveled and compacted using a self-propelled vehicle. Approaches in the layers are performed by the reciprocating motion of the combine.

The present invention relates to the mining industry and can be used in the development of powerful shallow potash formations with a layer of rock salt.

There is a method of developing powerful shallow potash seams (Pat. No. 2310074 Russian Federation, IPC E21C 41/20, No. 2006109947/03, declared. March 28, 2006, published on November 10, 2007), including working out the chambers with a selective harvester from the arrival for the entire the length of the chamber in layers from top to bottom with the transportation of the broken rock salt to previously used chambers as filling material.

The disadvantage of this method is the need to transport the broken rock salt to previously worked out chambers and the inability to use this method on formations with a small thickness of the upper layer less than the overall height of the extraction equipment.

Closest to the proposed technical solution is a method for the development of powerful shallow potash formations (Pat. No. 2272137 Russian Federation, IPC E21C 41/20, No. 2004133636/03, declared. 17.11.2004, publ. 20.03.2006). The method includes working off the chambers with a combine harvester of selective action with sunset equal to filling the vehicle with broken rock salt or potassium ore along the most powerful layer. The breakdown of the next entry begins with the lower layer of the reservoir. Moreover, all broken rock salt is transported to a neighboring waste chamber.

The disadvantages of this method are the need to transport all the broken rock salt into the adjacent chamber and the limited amount of entry in the volume of the broken ore or rock salt, equal to the vehicle capacity in the most powerful layer, which reduces production efficiency.

The technical result of the invention is to increase the efficiency of the selective method for developing powerful flat formations containing intercalated rock salt.

The specified technical result is achieved by the fact that in the method of developing a powerful flat potash formation with a layer of rock salt, including combine mining of the formation by cameras with ascending sequential approaches in layers, transportation of minerals by a self-propelled vehicle, mining of the formation in the chamber is carried out in layers at once for the entire thickness of the formation, in in ascending order by short vertical entries, starting from the bottom layer, while entries in the layers are performed at the maximum value by the executive shearer body, and when the stope of interlayer salt beaten off rock salt is placed behind the combine to the soil chamber in the form of a layer, the maximum thickness of which is determined by the formula:

L _m = ^ - *. Np where H _to - the height of the chamber in the penetration;

th _TT - the minimum height of the chamber to accommodate mining equipment;

Rock salt, beaten off at a distance from the beginning of the chamber, equal to the length of the combine, is placed in the previously spent chamber.

The broken rock salt, placed after the combine on the soil of the mined chamber, is leveled and compacted using a self-propelled vehicle.

Approaches in the layers are performed by the reciprocating motion of the combine.

The invention is illustrated by drawings, where in FIG. 1 is a flow diagram of a recess of a lower potash layer of a formation; in FIG. 2 - the same when excavating a layer of rock salt; in FIG. 3 the same when excavating the upper layer of the reservoir.

In the drawings indicated:

- upper potash layer; 2 - intercalated rock salt; 3 - lower potassium layer; 4 - mining combine; 5 - vehicle; 6 - practiced camera; 7 - a layer of broken rock salt; 8 - attachment on a vehicle for leveling the broken layer of rock salt; 1 ₃ - the length of the sunset.

The method is as follows.

The development of the formation in the chamber is carried out immediately for the entire thickness of the formation, in ascending order by short runs, starting from the lower layer of the formation 3 to a maximum value of 1 ₃ according to the executive body of the combine. The chamber 7 is tested using a selective-action combine with a drum-type executive body 4 (for example, a Ural-400 combine). The extraction of the reservoir in the chamber is carried out in ascending order by short runs, starting from the lower layer of the reservoir 3 to the maximum value along the executive body of the combine.

The broken ore by means of a self-propelled vehicle 5 is delivered to general vehicle vehicles (for example, conveyor lines) and the subsequent lifting of ore to the surface.

Then make an entry on a layer of rock salt 1 ₃ also at the maximum value on the executive body of the combine, taking into account the possible movement of the combine. In this case, broken rock salt is placed behind the combine on the soil of the chamber in the form of a layer, the maximum thickness of which is determined by the formula where N _to is the height of the chamber in the penetration;

- 1 016183

1ι _ηΉΙ1 - the minimum height of the chamber to accommodate the mining equipment.

At 11 _cl > H _to - 11 _{tn1, the} combine complex will not fit into the free space at the site of placement of broken rock salt in height. Therefore, part of the broken rock salt in excess of the indicated volume (taking into account the coefficient of loosening) is subject to storage in a previously worked out chamber.

The broken rock salt, which is placed on the soil of the chamber when working out the layer, is leveled using an attachment 8 and rammed with a self-propelled vehicle immediately after the operation of the combine, and rock salt, broken off at a distance from the beginning of the chamber, equal to the length of the combine, is placed in the spent a chamber to prevent filling of the excavation drift with rock salt repelled by the combine, i.e. normal operation of the excavating drift is ensured.

Then, after breaking off the bed of rock salt 2, they make an entry 1 ₃ along the upper potash layer 1 also by the maximum value along the executive body of the combine, taking into account the possible movement of the combine to the face with the delivery of the beaten ore by self-propelled transport to general vehicles for delivery to the surface.

Thus, by successive excavation with short cuts in each layer, a common, close to vertical, face line is formed, on which the face moves after the end of each work cycle. The specified cycle of mining operations in the chamber is repeated until it is fully worked out.

The approaches to the layers are performed as a result of the reciprocating movements of the combine to exclude the formation of the so-called scallops at the contacts of the layers to ensure the least dilution and loss of ore during excavation.

The proposed invention will improve the productivity of workers and reduce energy costs associated with the transportation of rock salt.

Claims (4)

CLAIM 1. The method of developing a powerful flat potash seam with a layer of rock salt, characterized by the following operations: conducting the combine mining of the reservoir in the chamber is carried out layer-by-layer by successive in-layers through the layers to the full thickness of the reservoir, in an ascending order by short visits, starting from the bottom layer; windings in layers are performed at the maximum value of the executive body of the combine; when performing rock salt inlets, repulsed salt is placed after the combine in the soil of the chamber in the form of a layer, the maximum thickness of which is determined by the formula where H _c is the height of the chamber in the penetration; 1ι _ηΉΙ1 - the minimum height of the chamber to accommodate mining equipment. 2. The method according to claim 1, characterized in that the rock salt, repulsed at a distance from the beginning of the chamber, equal to the length of the combine, is placed in the used chamber; 3. The method according to claim 1, characterized in that the fallen rock salt, placed on the soil of the chamber being worked out, is leveled and tamped using a self-propelled vehicle. 4. The method according to claim 1, characterized in that the stopping in layers is performed as a result of reciprocating movements of the combine.