UA8492U - Method for underground mining of ore deposits - Google Patents

Abstract

A method for underground mining of ore deposits involves bringing down of ore to compressed medium and horizontal compensation space, with ore discharge under overlying waste rocks. The panel in the contact zone with brought down rocks is drilled by additional rings of deep wells, and in the process of bringing down part of ore from the contact zone is displaced to the side of developed space with formation of vertical curvilinear contact of ore with waste rocks, this corresponds to the contours of the ellipsoid of discharge of the end discharge opening.

Description

Description of the invention

The useful model refers to the mining industry and can be used in underground 2 development of ore deposits by systems with the collapse of ore and host rocks.

A known method of underground development of ore deposits is that the mine field is divided into blocks, and the blocks are divided into panels. Each panel has its own release horizon.

Preparatory work for this version of the collapse system begins with the construction of field or ore roll-off tracks, from which orti-runs are carried out. Along the axis of the block are the main running field 70 lifting. To ventilate the block, an underfloor ventilation duct and a ventilation duct on the lying side are carried out. Inclined entrances - pipes are cut from the underfloor duct and knocked down among themselves.

After the cutting is finished, rod holes are drilled into its roof.

This option is used when mining ore of lower than average strength, which easily collapses and does not coalesce after cutting. 12 Ore is released from all the shafts evenly.

The disadvantage of the method is the limited field of application, relatively high loss and depletion of ore, low productivity of the worker on the system.

The nearest technical solution, selected as a prototype, is the method of development of ore deposits by a system with ore rejection by deep wells, including the collapse of ore on a confined environment and a horizontal compensation space and the release of ore under overlying empty rocks.

Disadvantages of the prototype are that when releasing the stock of the panel at the place of the "barrier" target, a part of the pure ore, which resembles a "lens" in shape, hangs and remains unreleased. Losses of ore in the "lens" are 1895 of all losses formed at the bottom of the block after release or 1.295 of the entire mass of the panel that is worked out. 29 The purpose of the useful model is to improve the method of developing ore deposits due to additional drilling of the near-contact zone of the panel, partial movement of a given volume of ore in the process of removal towards the spent space, creation of a curvilinear vertical contact corresponding to the contours of the output ellipsoid of the outermost row of output holes, which will avoid the process of forming a "lens" of unreleased ore in the near-contact zone, reduce ore losses by 1.295, additionally extract about 1.5 bts from each panel. tons of pure ore. Gee!

The task is solved due to the fact that ore removal is carried out by fans of deep wells, including the collapse of ore on a confined environment and a horizontal compensation space. According to the useful C model, the panel in the near-contact zone with collapsed rocks is drilled with additional fans of deep Ge) wells, and in the process of cutting, part of the ore from the near-contact zone is moved towards the produced space and

They form a vertical curvilinear contact of ore with empty rocks, corresponding to the contours of the outer outlet hole.

The claimed useful model is illustrated by diagrams, where "Fig. 1 shows the diagram of panel drilling; 8 in Fig. 2 - the panel after the collapse before the start of release 50 in Fig. 3 - the release of ore reserves from the contact zone, which is carried out first; c in Fig. 4 - panel after completion of release. with" The declared useful model is implemented as follows.

The mine field is divided into blocks, the blocks are divided into sub-floors, the sub-floors are divided into panels (each panel has its own production and delivery horizon). Preparatory work for this option begins with field or ore rolling. From these stretches, rolling orths are marked and passed at a distance of 40 m.

So Along the axis of the block there is a main running field lift, in which running, ventilation and "" ore-dumping departments are equipped. To ventilate the unit, an underfloor ventilation duct is used, and a ventilation duct on the lying side is used. The height of the floor is 80 m, the height of the sub-floor is 40 m, the length of the panels is 30 m, the distance between the axes of the sub-floor beams or beams is 10 m. From under-floor ducts (orts) 1 out of 20, outlet hole 2 is detected every 5 m. Outlet hole 2 is raised from the hanging side to the height of Zm and knocked down with a temporary drill string. This stretch serves to form a horizontal compensatory space (HCP) 3. All temporary coelyks are drilled with wells from ducts and holes under the coelykas and destroyed at the same time as the massive collapse of the ore massif placed above. Leveling wells are drilled from the drilling chamber located above the temporary drilling stretch to increase the height of the GKP Z. When drilling

SS o5 is finished, with a simultaneous short-delayed explosion, the rock stratum located between the main drill string and the GCP 3 is collapsed. All work on the creation of the GCP Z is carried out and ends simultaneously with the drilling of the massif located above with deep well fans 4 from the main drill string 5. This stretch 5 is carried out on at a distance of 15 m from the receiving horizon 1. NKR 100M machines are used for drilling the massif, the diameter of the wells is 0.105 m, and explosives - gramonite 79/21 are used for cutting. 60 The calculation of the parameters of drilling and blasting operations (BVR) is performed in relation to the conditions of the Kryvyi Rih Basin according to the BVR calculation methodology developed by Yu.P. Kaplenko. For these conditions (1-6-8, G-Z, 5t/mi, dokv-0.105 m, H- 1, H-1) they consist of:

Explosive index:

C-36,87. because the Line of Least Resistance (LNO):

UU-3.9 m.

The optimal distance between the ends of the wells: a-50 m.

Specific consumption of explosives for recoil: 4-0.079 kg/t.

It should be noted that, unlike the rest of the massif, the near-contact zone of the panel being worked out is drilled with additional fans of deep wells to move a part of the ore from the panel being worked out towards the produced space, and thereby creating a curvilinear contact of ore 6 with 7/ 0 by empty rocks, and is reflected on the trapped environment. This contact must correspond to the contours of the outlet ellipsoid 7 of the outermost outlet hole 2.

For this, we find the semi-minor axis of the output ellipsoid using the formula: ve oB'nNladyank m. where:

b - minor semi-axis of the release ellipsoid, m;

H - height of the release ellipsoid, m; ю B - the tangent of the average angle of movement of the ore to the discharge hole; in 0 vom where:

B, 90",

A - average, maximum and minimum angles of movement of ore to the discharge hole; c- (907 BI TZ, g- outlet radius, m. 255 V 0570/1475 30m-V2 M. Z

Based on the fact that from the axis of the extreme outlet hole 2 to the contact boundary of the panel with the used space is 2.5m, and the minor semi-axis of the ellipsoid of release B is equal to 6b.2m, it follows that the contours of the ellipsoid of release 6 go beyond the boundaries of the panel, which is used up by a maximum of 3 ,7 m. This leads to premature lateral depletion of the ore by empty rocks of the spent panel and the formation of a "lens" of unreleased ore at the site of the contact zone. To prevent the formation of a "lens" and to combat premature lateral depletion, part of the Fu ore from the near-contact zone of the panel, which is being worked out, is moved to the side of the produced space. To do this, three parts are defined in height in the panel. Above is part A, in the middle - part B, below - part Z

C. According to the contours of the outlet ellipsoid 7 of the outermost outlet hole 2 of this panel, the amount of displacement of part A and part C ( i) is equal to: 2.2 m (determined graphically), and the amount of displacement of part B ( i) is equal to:

Apo in -0571, M. « where: -

b is the semi-minor axis of the release ellipsoid, m,

And - the distance between the rods, m. s laz -6.2-0.575-3.7M :z» The BVR parameters for the near-contact zone deflection will change and will be:

The line of least resistance for breaking part A and part C:

UM 1-3.4 mm. with. т и со Line of least resistance for breaking part B:

UU2-3, Ohm. t. To create a vertical curvilinear contact corresponding to the contours of the output ellipsoid of the outermost c row of rods, part B is drilled with structured fans of deep wells 8, and parts A and C - with paired ones 9.

The amount of explosive substance (BP), placed in the fans of the contact zone, necessary to move the volume of ore, when it hits the confined environment, is determined by the formula:

Ge ku aa oa ; KG, where: Fr. - the number of BP placed in part A;

Сс-Е 55 О» - the number of BP placed in part B;

Oz - the number of BP placed in part C; shi ho, kg, where:

U" - the reserve of part A, i.e. 4 - the specific costs of BP for the rebound of part A, taking into account the compression ratio K (the compression ratio is found on the monogram, when moving yn.-2.2m. K-2.23, when moving and » -3.7m, K"-1.25).

The specific costs of BP for the rejection of part A are determined according to the BVR calculation method and for these conditions are: 65 dac, kg/t. a-0.07971.5-0.119 kg/t.

О04-175070,119-208,25Kg.

Based on the fact that the movement in parts A and C is the same, and the stocks of these parts are equal, the amount of BP located in part C is equal to the amount of BP located in part A.

O4-05-208.25 kg. dr emtka, where:

У" - reserve of part B, t; а" - specific costs of BP for the rejection of part B, taking into account the compression ratio К"; аа" Кк -0.07972.23-0.176 kg/t.

О02-175070, 176-308Kg. 0-208.25-308208.25-724.5 kg.

Depending on the height of the reflective layer, and therefore the height of the release ellipsoid, the amount of BP located in the fans of the near-contact zone changes:

O-KV).

When the height of the reflected layer increases, the amount of BP increases, and when it decreases, it decreases.

The fans of the contact zone and the rest of the panel explode simultaneously in a short slow-motion explosion.

After the massif has been cut off, they begin to release the ore. For this method, alternating and staged release of ore is used. First of all, clean ore is released from a number of ducts of the contact zone (extreme, odd) without leaving a "barrier cell" before the beginning of depletion. At this moment, there is a complete outflow of ore, which in the process of cutting was moved towards the spent panel. Then clean ore is released from the remaining odd-numbered rods according to the order of their location before the beginning of depletion. In the second step, pure ore is released from the steam pits before the beginning of impoverishment. In the third step, demineralized ore is released from the odd-numbered rods, and in the fourth - from the even-numbered ones.

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Claims (1)

The formula of the invention of s.c.o. The method of underground development of ore deposits, which includes the collapse of ore on a confined environment and a horizontal compensation space, the release of ore under the overlying waste rock, which differs from 50 in that the panel in the contact zone with the collapsed rocks is broken by additional fans of deep wells, and in the process of cutting, part of the ore from the near-contact zone is moved towards the produced space and forms a vertical curvilinear contact of ore with waste rock, corresponding to the contours of the output ellipsoid of the extreme output hole. shu o5 Official Bulletin "Industrial Property". Book 1 "Inventions, useful models, topographies of integrated microcircuits", 2005, M 8, 15.08.2005. State Department of Intellectual Property of the Ministry of Education and Science of Ukraine. 60 b5