RU1812309C - Process of mining thick self-igniting coal seams - Google Patents

Abstract

Usage: the invention allows to develop powerful self-igniting coal seams with inclined layers using a mechanized complex by moving it only along the soil of the seam. SUMMARY OF THE INVENTION: after passing a masonry pit, puffs are removed from the roof of the workings and filled with crushing coal, the filling is carried out sequentially with alternating sections, in the stored areas the working is filled with ice, the crushed coal is impregnated with antipyrogen and frozen as seawater is used as a flame retardant, and when the second and subsequent layers are mined, thawed coal and ice are thawed. 3 silt, ate

Description

The invention relates to the mining industry and can be used in the development of powerful self-igniting coal seams by mechanized complexes in permafrost conditions.

The aim of the invention is to keep the roof frames from damage and reduce fire hazard when developed under permafrost conditions.

In FIG. 1 shows a diagram of mining a powerful layer of the proposed method; in FIG. 2 is a section AA in FIG. 1; in Fig.3 - section BB in Fig.1.

The development of a powerful reservoir of the proposed method is as follows

In order to prepare for excavation of a powerful layer 1, a conveyor and ventilation drift 2 is carried out at its soil, after

of this, the first layer is excavated with a treatment face 3 ,. which is moved along the soil, the thickness of the layers is taken depending on the total removable thickness of the formation so that it can be divided into parts equal to the height of the applied serial mechanized complex, while fluctuations in the removed thickness of the layers are allowed within the upper and lower height parameters mechanized lining.

As the mine face moves in the preparatory workings, sections 4 and 5 are alternately alternating between the lengths of the workings: in sections 4, puffing from the roof and collapse between the frames of the coal mass support over the mine workout, the whole section is completely filled with the last collapsed coal, in sections 5 lay the mine ice

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blocks prepared in advance on the day surface and delivered to the place of work. The coal-filled sections of the mine are watered with flame retardants (sea water). Under conditions of negative temperatures, moist coal saturated with sea water freezes and forms a dense filling mass. As the first layer is removed and the treatment face moves along the soil, the worked-out part of the formation is lowered onto the soil and loaded with overlying rocks. The development of the second 6 and subsequent layers is also carried out by moving a mechanized complex along the soil of the formation. To prepare them using a local heating unit, the coal is thawed and the ice filling the mine is melted, the coal is unloaded, and the lining in the mine is restored.

In specific conditions, for example, Anadyrsk mine, the proposed method can be implemented as follows. The mine is preparing for mining Anadyrsky formation with a capacity of 12m. The top of the formation is arkose sandstone, the soil is gray, fine-grained sandstone, work is carried out in the permafrost zone, the temperature of the host rocks is -3 ... -4 ° C. In order to prepare for the formation dredging by the proposed method, conveyor and ventilation drifts are carried out along the soil of the formation. The cross section of the workings is 8 m2, the fastening is metal arches installed after 0.8 m. The roof and blocks are tightened. The formation is planned to be worked out by a mechanized complex ZhM-81. The thickness of each layer in accordance with the standard size of the complex is taken to be 3 m. Then the number of layers will be 12: 3 4, i.e. the formation must be worked out in the A layer. After installation of the mechanized complex, the first layer is started to be worked out with the mechanized complex being absorbed along the soil of the formation. As the mine moves, the formation behind the lava is filled with coal and ice. This is done as follows. At a distance of 2 m along the length of the mine, lay it with ice blocks, Ice blocks of 0.8 x 0, 5 sizes are prepared on the surface by pouring water into the molds and freezing it at a temperature of (30-40) ° С ( the average winter air temperature, the ice blocks made in this way are stored in the mine workings and stored at a temperature of 2-4 ° C. After laying the ice production at a length of 2 m (4 frames), the next 2 m of production filled with coal by removing puff from the roof and collapsing the coal mass into the interframe.

Its coal production is treated with antipyrogen, which is used in the Bering Sea water, which contains calcium chloride, which is the main component of the widely used antipyrogen. The most effective concentration for use in this quality in an aqueous solution is 10-15%. Its composition in the waters

Bering pestilence of 6-8%, to achieve the desired concentration, excess moisture is preliminarily removed from it by keeping it in open containers in the summertime (warmed concrete

5 trenches).

The amount of flame retardant to prevent spontaneous combustion is assumed to be 0.2-0.3% of the mass of coal laid in the mine. The supply of flame retardant is carried out from the tank, which can be used as a mine trolley, using the pump UN-35. After pouring coal with antipyrogen in conditions of negative temperature of rocks and air and the presence of

5, the ice lining the coal freezes and forms a dense backfill mass, protecting the mine support from destruction. After excavating the first layer for the entire length of the extraction column, they begin to prepare and develop the next layer. To do this, using the heater, the air is heated to 40-50 ° C. The thawed coal is unloaded and the restoration of puff and support is started.

5 The proposed method has the following advantages compared to the prototype. It allows you to work out seams of almost any capacity, does not require the use of supports of various sizes, allows you to reduce the cost of conducting and maintaining formation workings, allows you to work out coal seams that are dangerous for self-ignition, and reduce the cost of transporting coal, preparing the layer for excavation and time for commissioning a new mine floor section. The expected economic effect of the implementation of the method in only one area with reserves of 300 thousand tons of coal will be about 1

0 million rubles

Claims (1)

SUMMARY OF THE INVENTION A method for developing high-power, self-igniting coal seams with mechanized complexes in layers, comprising 5 carrying out the preparatory workings near the soil of the formation, the formation of excavation pillars, fixing the workings with a frame support with a puff of the roof, extracting puffs from the roof and filling the pit with coal that collapses between frames with the subsequent shipment of coal and restoration of the support, characterized in that, in order to preserve the support frames from damage and reduce the fire hazard ™ when developing under permafrost conditions, the formation is worked out within the excavation column sequentially layer by layer with one face, which move along the soil of the reservoir, extracting puffs from the roof of the workings and they are filled with collapsing coal in successive alternating sections, in the preserved areas of the lining the production is filled with ice, the crushed coal is impregnated with antipyrogen and frozen, seawater is used as antipyrogen, and frozen coal is thawed when working the second and subsequent layers and ice.