Dehydration method of mineral deposit

FIELD: mining.

SUBSTANCE: method involves collection of underground water to manifold (17) around development zone (26) of ore (8) deposit (7) so that cone of depression (27) is formed owing to operation of rings (14) of upward discharge wells (15) drilled out of drain annular mine working (6). Inflow is supplied from manifold (17) of mine working (6) by gravity via pipeline (18) of development mine working (4) to sump (19) of well shaft (1) for cleaning and accumulation. Then, some part (28) of accumulated inflow is supplied by means of pump (22) of well water drainage via pipeline (21) to surface (9) into closed pipeline (20), and from it to water bearing horizon (3) through pumping wells (10) pre-drilled from surface (9) within cone of depression (27), thus providing such pumping mode that pumping flow rate Q3 is less than pumping-out flow rate Q0, and heads H3 of underground water in the propagation area of pumped water are less than heads H0 out of this area, i.e. they provide the compliance with conditions Q3<Q0 and H3<H0.

EFFECT: providing environmentally safe utilisation of technogenic drainage water.

1 ex, 6 dwg, 1 tbl

 

The invention relates to mining and can be used for the disposal of drainage water in underground development of mineral deposits that lies beneath the aquifer.

There is a method of dewatering mineral deposits (SU 977582, E02D 19/10, 30.11.1982), including the collection around the underground water Deposit with the formation of a depression cone, taking them from the field, drilling of water-absorbing wells in a line perpendicular to the radius of the depression cone and introducing free loading of groundwater with the return of the latter to the field aquifer with partial delay due to the formation of linear zones of low permeability. The disadvantage of this method is that it is economically unacceptable in underground development of deposits.

Famous adopted as the prototype of a way of restoring the hydrological regime of the mining enterprises (EN 2293819, E02D 19/06, 20.02.2007). It includes collection of groundwater around the areas of field development with the formation of a depression cone, cleaning, storage in an underground sump and flow in the aquifer, and flow accumulated mine inflow is produced using coal mine drainage in the intermediate settling tank (underground or surface), located at the border of the depression cone in the direction of the line, the fall of the aquifer, providing protection from return water to the existing mine workings. The disadvantage of this known method is the increased operating costs and reduced environmental reliability, since it is necessary to construct the intermediate clarifiers, and due to the necessity of filing accumulated mine inflow at the border of the depression generation requires a significant length of pipelines, in addition to the plot of injection pressure reaches values exceeding the permissible size and working pressure normally applied to pumps.

The invention consisted in the creation of such a method of dewatering mineral deposits, which would allow to ensure the environmentally safe disposal of man-made drainage water through closed their turnover in the drying process while improving safety and reducing the cost of implementation.

To solve the problem with the achievement of the technical result of the method of dewatering of mineral deposits involves collecting groundwater at least around the area of field development with the formation of a depression cone, cleaning, storage in an underground sump and supply part of the accumulated inflow using mine drainage n the surface with subsequent infiltration into the aquifer.

A distinctive feature of the patented method is that the Buryats from the surface around the edge of the field development within a depression cone injection wells and pumped through them in an aquifer is raised to the surface groundwater, and provide a mode of injection, so that the flow rate of injection QCwas lower than the pumping rate of Qaboutand the heads H3groundwater in the area of distribution of the injected water were smaller heads Haboutoutside this area, i.e. ensure compliance with conditions

QC<Qaboutand HC<HO.

The invention is illustrated: (a) drawings, which shows:

figure 1 - method of dewatering mineral deposits, the phase of completion of works closed around the tubular deposits of underground excavations (part vertical section);

figure 2 - the same, the phase of completion of construction of injection wells (part of the vertical section);

figure 3 - the same, the operation phase of the system of drainage after drainage wells (part of the vertical section);

figure 4 is the same, the section a-a in figure 3 (enlarged scale);

figure 5 - the same, type B figure 3;

figure 6 - same hydrodynamic scheme predicted groundwater levels in the tubular drainage field on the current data of the numerical model is Finance by the finite element method;

b) table (Hydrodynamic parameters adopted in the calculation).

The proposed method of drainage, for example, tubular mineral deposits is to create a drainage system and providing a specific mode of its operation.

Creating a drainage system includes the following.

After sinking two shafts 1 and 2 (figure 1), crossing the main aquifer 3, and horizontal preparatory development 4 in drained aquifer 5 are drainage generation 6, closed around the tubular field 7 mineral (ore) 8.

With the surface 9 (2) of the Buryats with known drilling equipment around the field 7 (around the edges 7a of the development within the future depression cones) injection wells 10 crossing alluvial rocks 11 and aquifer 3. Injection wells 10 equip casing 12 with filters 13 (in the zone of the aquifer 3).

Of drainage generation 6 (Fig 3 and 4) Buryats fan 14 rising water wells 15 in drained aquifer 5, equip them with filters 16 and conductors with shutoff valves (not shown). Last hydraulically connected with laid on drainage development 6 collector 17, associated with passing functions is tovitelnoy development 4 18 pipe sump 19 of the shaft 1.

Connect the casing 12 (figure 5) with a closed surface pipe 20, and the latter with the pipe 21, the portion 21A which are laid on the surface 9 and the second part (vertical) 21B is placed in the shaft 1 and is injection pipe mine pumping (pump 22 associated with the sump 19 of the suction pipe 23 with a filter 24).

The operation of the drainage system is as follows.

When working drainage systems collect groundwater 25 at least around the area 26 field development 7 with the formation of a depression cone 27, cleaning and storage in the underground collection (sump 19) and the supply of part 28 of accumulated flow to the surface 9 through the pipeline 21 mine drainage (via pump 22 in a closed pipeline 20. Then raised to the surface groundwater through injection wells 10 is injected into the aquifer 3 (within a depression cone 27), providing them with the infiltration zone 29 distribution of recycled so drainage water, not beyond the depression cone 27. At the same time provide this mode of injection, so that the flow rate of injection QCwas lower than the pumping rate of Qaboutand the heads H3groundwater in the area of distribution of the injected water were smaller heads Haboutin the E. this area, they ensure compliance with the conditions QC<Qaboutand HC<Habout.

The effectiveness of the proposed method of dewatering mineral deposits, providing for the disposal of drainage water for any possible situation, confirmed by calculation using numerical simulation by the finite element method (program MODFLOW package GMS 6.5). The period of predictive modelling was 25 years old.

Example of calculation

The initial conditions (6)

Working on a mineral Deposit is located at a depth of 600...650 m from the ground surface (abs. OTM. - 390... - 440 m) and is dedicated to the watered rocks (aquifer 30). The average absolute level of statistical groundwater levels in the aquifer 30 is 150 meters of the Aquifer 30 is separated from the supply watery aquifer 31 thickness of permeable sediments 32. The average absolute level of the static groundwater level in the aquifer 31 is 150 meters Hydrodynamic parameters of aquifers 30 and 31 and the separating layer 32 are given in the table.

The radius of the loop supply aquifers (30 and 31) 12.5 km, the radius of the drainage system 150 m, the areal radius of the pumping drainage water 250 m

The initial conditions for groundwater levels taken on the result of the modeling problems for stationary conditions during operation of the drainage system with a pumping rate of Q 0=682 m3/h without reverse pumping of drainage water.

On the outer border region of the filter set to a constant value of groundwater level H=+150 m

The simulation results (figure 6 groundwater level in the upper or lower aquifer has the designation "a" or "b" in the figure):

the steady-state level when the flow rate of the drainage system Qabout=682 m3/h without reinjection (curves 33a and 33b),

level after 1 year at the rate of injection QC=500 m3/h (curves 34a and 34B),

the steady-state level when the rate of injection QC=500 m3/h (curves 35A and 35B).

The inflow to the drainage system increased by pumping the drainage water 10 m3/h, the power of the skyline from the external borders decreased to 490 m3/H. the Volume of recycled water was 600 m3/h or 72% of the pumped volume. The incidence of pumped drainage water in the upper aquifer localized in the region of radius R≈700 m

The use of the invention allows to improve the environmental safety of mining enterprises by eliminating distance delivery of pumped drainage water outside the depression cones and safety due to complete interception of drainage water.

The invention reduces the cost of the drainage field, as excluding what is needed in the construction of the storage drains and pipes of considerable length, as well as reduced energy costs for pumping drainage water supply drainage water directly into the zone of depression cones is carried out without an increase in pressure above the natural values that existed prior to pumping).

Utilization of groundwater are possible when using the invention in the case of the development of the field below the flooded mine workings, such as career, directly within the deepest part of the depression cone caused by the drainage of the field.

Table
Hydrodynamic parameters adopted in the calculation
AquiferPower, mThe filtration coefficient, m/dayThe coefficient of appointest, 1/mThe coefficient of elastic loss
The upper (31)80102,5·10-40,002
The bottom (30)500,12,0·10-50,001
The separating layer (32)100,00051,0·10-50,0001

The method of dewatering of mineral deposits, including the collection of groundwater at least around the area of field development with the formation of a depression cone, cleaning, storage in an underground sump and supply part of the accumulated inflow of using coal mine drainage on surface with subsequent infiltration into the aquifer, characterized in that the Buryats from the surface around the circuit design within a depression cone injection wells and pumped through them in an aquifer is raised to the surface groundwater, and provide a mode of injection, so that the flow rate of injection QCwas lower than the pumping rate of QAboutand the heads HCgroundwater in the area of distribution of the injected water were smaller heads HAboutgroundwater outside this area, i.e. ensure the observance of the conditions QC<QAboutand HC<HAbout.



 

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1 ex, 6 dwg, 1 tbl

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