Method of working-out backfilling in flooded potassium mine

FIELD: mining.

SUBSTANCE: method of working-out backfilling in flooded potassium mine involves well drilling, preparation of pulp by mixing carrying liquid and solid particles, supply of pulp through wells to flooded working-outs, and backfilling of working-outs. Drilling of injection well and well for liquid pumping-out is performed from day surface to flooded working-out meant for backfilling. Carrying liquid for pulp preparation is taken from flooded backfilled working-out on the level of its soil through the nearest well of the drilled wells. After excess pressure appears on the mouth of the injection well, pulp is supplied continuously; total supply volume of pulp solid particles to the mine through the injection well does not exceed the volume of possible liquid filtration through a sinkhole formed during flooding of potassium mine.

EFFECT: invention allows reducing the deposition of ground surface above flooded mine owing to preventing probable leaching.

1 dwg

 

The invention relates to the mining industry and can be used when laying mines planned or emergency flooded mines.

Known way to prevent flooding, potash mines and dangerous deformations of the earth surface when breakthroughs in the mines groundwater, including drilling from the surface to the camera, submission to the camera backfill material through wells (U.S. Pat. 2341658 of the Russian Federation. The way to prevent flooding potash mines and dangerous deformations of the earth surface when breakthroughs in the mines groundwater. No. 2007123225/03; Appl. 20.06.07; publ. 20.06.08, bull. No. 17).

However, this method is time consuming and requires certain costs in the preparation of pulp for bookmarks cameras.

Closest to the proposed technical solution is the way hydrobalance flooded underground cavities, including filling flooded underground cavities by injection coarse slurries through wells from the surface (Gaidin A.M. Hydrosolate flooded underground cavities. /A.M. Gaidin.// Horn. Journe. - 2011. No. 2. - P.34-36).

The disadvantage of this method is that in the process of feeding the slurry through the borehole possible blockage of the well settled material.

The technical result of the invention is to reduce the subsidence of the surface above the flooded what Unicom due to prevent possible leaching carnallite pillars.

The technical result is achieved in that in the method of the laying of mines in the flooded potash mine, including drilling, preparing slurry by mixing the carrier liquid and solid particles, the flow of the pulp through wells in the flooded workings, bookmark workings, drilling injection wells and wells for pumping fluid produced from the surface in the flooded production intended for bookmarks, while the carrier liquid for the preparation of pulp taken from the flooded lay the output level of the soil through the nearest of the drilled wells, the flow of the pulp after the occurrence of excess pressure at the mouth of the injection wells produce continuously, the total volume of the solid feed particles of the pulp in the mine via the injection well does not exceed the amount of possible filtering the liquid through a failure funnel formed by the flooding of potash mine.

The implementation of the method is examined on the example of the technological scheme bookmarks workings carnallite emergency reservoir flooded mine Berezniki potash mine.

At the time of the flooding of the mine part of carnallite workings were neoslojnennoe. After the flooding of the mine due to the decomposition of carnallite and education additional cavities p is on these workings are expected large subsidence of the surface. Reduction of subsidence can be achieved by DataBlade flooded workings.

The essence of the method is illustrated in the drawing, which shows a General scheme bookmarks flooded workings of the mine.

In the drawing: 1 - injection well; 2 - the well for pumping fluid; 3 - put output; 4 - haul trucks; 5 - place of storage of backfill material; 6 - loader; 7 - mixer; 8 - pump; 9 - water pump; 10 - sealer; 11 - gauge; 12 - production; 13 - ventilation output, 14 - flops funnel.

The method is as follows.

On the earth's surface, over predefined areas bookmarks, equip the site preparation of the pulp. To do this, to the place of storage 5 deliver backfill material, for example, dump truck 4, where the loader 6 backfill material loaded into the mixer 7, which serves fluid.

To conduct filling operations are drilling two wells. One of them, for example, injection well 1, the mouth of which establish sealer 10, serves to supply backfill slurry, and the other bore 2 for pumping fluid. Wells are drilled so that they were put in production 3. Pumped using a submersible pump 8 fluid from the borehole 2 is fed to the mixer 7 and is used to prepare filling slurries is.

The bookmark is produced as follows.

The resulting slurry from the mixer 7 groundwater pump 9 is injected into the injection well 1.

The process control bookmarks are in terms of gauge 11, placed at the mouth of the injection wells 1.

Under the pressure of the column of pulp in the borehole to produce the tab openings 3 and 12, which are close to the injection well 1.

After the start of the supply of filling material into the injection well 1 pressure in it, on the manometer readings, missing, and then as bookmarks workings increases until, until it becomes redundant.

To ensure the efficiency of filling operations and eliminate the possibility of blockage of the bore within it the settled material after the occurrence of excess pressure at the mouth of the injection wells flow of pulp carried out continuously.

It should be noted that the pressure loss of transporting the slurry in a flooded mine is expected more than the usual tab due to the fact that the movement of the pulp by planting mines 3 and 12 is in the form of a submerged jet. Thus the fluid from the openings 12 when the tab goes to the vent production 13 and further to a failure hopper 14, through which the filtering of excess fluid.

When the pressure in the well, fixed the manometer 11, will be close to the pressure pump 8, the tab openings 3 and 12 ceased.

Potash mine is a tank with walls through which the fluid is not filtered, so by feeding the pulp into the flooded potash mine will be a rise of water in a failure funnel 14 formed by the flooding of the mine.

Since the roof of the flooded workings are mineralized water, when the lifting operation is salinization of groundwater. Therefore, when large capacity feeding the pulp will happen spout water from the collapse crater 14 on the earth's surface, which is unacceptable on environmental conditions.

To prevent salinization of groundwater hour solids in the mine limit so that it does not exceed the amount of possible filtering the liquid through a failure funnel in the range from the top of salt to the level of fresh water or the appropriate level of saline water. If the solids are greater than the possible amount of filtering will salinization of groundwater.

Water from the well for pumping fluid 2 must be made near the soil laying generation 3, which will provide the maximum content of MgCl2in the liquid and eliminate the possible leaching of pillars, for example, carnallite, and therefore, prevent the subsidence of the earth's surface.

The proposed method allows to reduce the cost of laying cameras through the use of for making pulp of fluid from the flooded mine and reduce subsidence of the surface due to prevent possible leaching carnallite pillars.

The method of the laying of mines in the flooded potash mine, including drilling, preparing slurry by mixing the carrier liquid and solid particles, the flow of the pulp through wells in the flooded workings, the tab openings, characterized in that the drilling of injection wells and wells for pumping fluid produced from the surface in the flooded production intended for bookmarks, while the carrier liquid for the preparation of pulp taken from the flooded lay the output level of the soil through the nearest of the drilled wells, the flow of the pulp after the occurrence of excess pressure at the mouth of the injection wells produce continuously, while the total flow of solid particles of the pulp in the mine via the injection well does not exceed the amount of possible filtering the liquid through a failure funnel formed by the flooding of a potash mine.



 

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