KR101519967B1 - Method for solution mining by cycling process - Google Patents

Abstract

The present invention relates to a dissolution mining method for mining beneficial minerals by dissolving a useful mineral underground by injecting a solvent and then recovering the solvent.
The circulating dissolution mining method according to the present invention includes a drilling step in which a drilling well is formed through excavation up to a deposit where dense beneficial minerals are densified and a crushing step in which the crushing equipment is inserted through a drilling well to form a crack in the deposit A step of inserting a pipe up to the lower part of the drilling hole and injecting a solvent capable of dissolving the beneficial minerals through the pipe to the deposit so as to impart rotational force to the solvent discharged from the pipe to increase the diffusion force of the solvent, And a production step of recovering the dissolved solvent.

Description

[0001] The present invention relates to a method for solution mining by cycling process,

The present invention relates to a mining method for mining utility resources underground, and more particularly, to a mining and mining method in which a solvent is injected into an underground ore deposit in which useful resources are concentrated, .

As resource development continues for a long time, the method of mining resources in a traditional way faces many difficulties in terms of economy and technology. In recent years, a method of developing resources using solution mining has been actively applied, away from traditional mining methods.

Melting mining was first used in 1922, but now it has developed to a considerable extent in the resource development industry, as shown in the table of FIG. Currently, at least 25% of the production of gold, silver, copper, uranium, sodium, magnesium, sulfur and lithium in the United States is being developed by molten mining.

The dissolution mining method forms a borehole up to the dense mineral deposits and dissolves or leaches the beneficial minerals by injecting the solvent into the drilling wells, And recovering and producing beneficial minerals.

In the existing dissolution mining method, mainly the study on the injection temperature of the solvent to be mined and the surrounding lipid environment, the study on the fluidity of the solvent depending on the surrounding environment such as the porosity and the permeability in the mineralized layer.

However, there is a lack of research on improving the production rate and economic efficiency by effectively penetrating and diffusing the solvent in the deposit.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a circulating dissolution mining method capable of effectively increasing the penetration and diffusion of the solvent in the upper layer, thereby improving the production speed and economy.

In order to accomplish the above object, a circulating dissolution mining method according to the present invention includes drilling a drill to form a drill hole through excavation up to a deposit where dense beneficial minerals are concentrated; A crushing step of injecting crushing equipment through the drilling well to form a crack in the deposit; An injection step of injecting a pipe up to the lower part of the drilling well and injecting a solvent capable of melting the beneficial mineral to the deposit through the pipe so as to increase the diffusion force of the solvent by applying a rotational force to the solvent discharged from the pipe, ; And a production step of recovering the solvent in which the beneficial minerals are dissolved.

According to the present invention, a blade is coupled to a lower portion of the pipe, and the blade rotates so that the blade imparts rotational force to the solvent.

The pipe is a double pipe having an inner pipe and an outer pipe. The solvent is injected through one of the inner pipe and the outer pipe, and the solvent in which the useful mineral is dissolved is recovered through another pipe do.

In addition, the inner tube may further include an air injection tube for injecting high-pressure air. In the injection step, high-pressure air may be injected together with the solvent through the air injection tube.

In another embodiment of the present invention, at least two drill holes are formed at a distance from each other, the pipe is installed in each drill hole, and at least one drill hole is used as an injection hole for injecting the solvent, At least one other drilling tablet is used as a production tablet for recovering the solvent in which the beneficial minerals are dissolved.

In this case, it is preferable that a plurality of the product tablets are formed, and the product tablets are spaced apart from each other around the drill tab.

In the present invention, a blade for imparting a rotational force to a solvent is rotatably coupled to the pipe, and the blade is changed between a first posture disposed horizontally to the pipe and a second posture disposed to project from the pipe It is possible.

For example, a spring is engaged between the pipe and the blade, and the spring elastically presses the blade to the second posture.

The pivoting axis of the blade may be formed to be parallel to the longitudinal direction of the pipe. In the initial stage of the pouring step, the pipe is rotated in a first direction in which the blade is directed toward the first posture, And is rotated in a second direction opposite to the first direction.

The blade according to another example may be arranged to be inclined with respect to the longitudinal direction of the pipe, and the rotation direction of the blade may be adjusted in the injection step so that the solvent can be diffused upwardly or downwardly.

In the present invention, a blade is provided at the lower end of the pipe, and the blade is rotated to form a turbulent flow in the solvent. Solvents formed by turbulence rapidly penetrate the cracks formed in the strata and dissolve the minerals to expand the cracks. The enlarged cracks increase the dissolution rate and production rate of minerals as the contact area between solvent and useful minerals is widened.

According to the present invention, it is possible to increase the rate of production of useful minerals by increasing the dissolution rate of minerals. Also, as the dissolution rate is increased, the amount of the mineral dissolved in the same amount of solvent increases as compared with the conventional dissolution mining method, so that the concentration of the mineral in the solvent increases, so that it is advantageous in that the recovery of the minerals from the solvent is facilitated.

FIG. 1 is a table showing the mineral production rate in the United States by the dissolution mining method.
2 is a schematic flow diagram of a circulating dissolution mining method according to the present invention.
3 is a schematic view of a single well system for performing a circulating dissolution mining method according to a first embodiment of the present invention.
4 is a view for explaining the first embodiment of the present invention.
5 is a schematic diagram of a variant of the single well control system shown in FIG.
FIG. 6 is a schematic view of a multi-well system for performing a circulating dissolution mining method according to a second embodiment of the present invention. FIG.
FIG. 7 is a view for explaining the arrangement of multiple drilling definitions shown in FIG. 6. FIG.
8 is a view for explaining a second embodiment of the present invention.
Fig. 9 is a view for explaining a first form of a blade mounted on a pipe, in which (a) is a first posture before a blade is unfolded, and (b) is a second posture after a blade is unfolded;
Fig. 10 is a view for explaining a second form of the blade mounted on the pipe, in which (a) is the first posture before the blade is unfolded, and (b) is the second posture after the blade is unfolded.

The present invention is for mining beneficial minerals such as gold, silver, copper, uranium, potassium, sulfur, and lithium that are present in the basement. The mining according to the conventional method is performed by constructing a tunnel to the subterranean ore, or, when there is a deposit at a place not deep in depth, the openings are excavated and mined. However, in the case of mineral deposits which are not economically viable due to the conventional method of mining, if the minerals to be mined are soluble in the solvent, they can be mined by the mining method.

The dissolution mining method according to the present invention is characterized in that a drilling solution is formed to a layer where a deposit exists and a solvent is injected through the drilling solution to dissolve the useful minerals in a solvent and then the solvent in which the beneficial minerals are dissolved is extracted to the ground, It is a method of separating and recovering minerals.

The geological conditions for using the dissolving mining method are generally that the upper and lower strata of the strata where the deposit is present are impervious to water with an extremely low water permeability. This is because the solvent in which the beneficial minerals are dissolved must be recovered to the ground through the drilling wells, so that the loss of the solvent is inevitable when the upper and lower strata are in the permeable layer.

One of the important technical challenges in the dissolution mining method is to increase the solubility and dissolution rate of the beneficial minerals in the solvent. When the solubility is high, the concentration of the useful minerals in the solvent is increased, so that the productivity is improved and the useful mineral can be easily separated and recovered from the solvent. Also, if the solubility is high, the mineral can be dissolved using a small amount of solvent, so that the economical efficiency can be improved. If the dissolution rate is increased, the mining time can be shortened, which is economical.

That is, by increasing the solubility and dissolution rate in the solvent of the beneficial minerals, the production efficiency and economical efficiency are remarkably increased. The present invention aims to improve the solubility and dissolution rate of useful minerals by allowing a solvent to form a turbulent flow by a physical method.

The method of forming a vortex in the solvent may vary, and the dissolving method of forming a vortex in the solvent by any means will fall within the scope of the present invention. In the present invention, a vortex is formed by imparting a rotational force to a solvent by a physical method. In particular, a method of rotating a solvent by rotating a pipe by installing a blade outside a pipe for injecting a solvent is adopted.

Hereinafter, a circulating dissolving method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a schematic flow chart of a circulating dissolution mining method according to the present invention, and FIG. 3 is a schematic view of a single well control system for performing a circulating dissolution mining method according to a first embodiment of the present invention, 1 is a view for explaining a first embodiment of the present invention.

2 to 4, the circulation type dissolution mining method (M100) according to the present invention includes a drilling step M10, a crushing step M20, a pipe installation step M30, an injection step M40, M50).

In the drilling step M10, the ground g is bored to the stratum where the mineral deposits are present, thereby forming the drill 1. This embodiment is a single well system in which a single drill hole is used to inject a solvent and produce minerals. However, the definition of a single drilling definition does not necessarily mean that a single drill hole is formed in the deposit, but a plurality of drill holes can be formed by injecting a solvent and producing minerals together, respectively.

The drilling rig 1 is generally vertically excavated, but may also be excavated in an inclined form depending on the geological conditions. When the drilling is completed up to the deposit, install the casing (2). The casing 2 is provided so as to firmly hold the wall of the drill hole 1. The casing may be long to the impervious region of the upper layer where the deposit exists, .

When the drilling step M10 is completed, the crushing step M20 is performed. The crushing step (M20) is intended to fracture cracks (c) in the strata where the deposit is present so that the solvent can penetrate and flow in the stratum. The methods of forming the cracks vary, and generally hydraulic fracturing is used. That is, a crushing machine is inserted into the drill hole 1, and a packer is installed at the upper and lower portions of the region where the crack is to be formed (the deposit with the deposit) to seal the hole, To form cracks (2) in the ground layer. Upon completion of the formation of the crack, the packer which has been inflated so as to come in close contact with the air wall is contracted to remove the crushing equipment from the crucible (1).

However, in the crushing step, water jet penetration or blasting penetration may be used in addition to the hydraulic crushing described above, or cracks may be formed in the drill hole through the recently developed cooling method using liquid nitrogen .

After the crushing step (M20), a pipe installation step (M30) for inserting a pipe (10) for injecting solvent into the drill hole (1) is performed. In the first embodiment, since the circulation process for injecting and recovering the solvent in the same drill hole is to be formed by using the single drill hole method, the pipe 10 uses a double pipe shape.

The pipe 10 used in the first embodiment comprises an inner pipe 11 and an outer pipe 12. The solvent is injected using either the inner tube 11 or the outer tube 12, and the solvent is recovered using the other tube. The inner tube 11 is formed slightly shorter than the outer tube 12 as shown in Fig.

The inner tube 11 has a circular cross-section through which the fluid flows, but the outer tube 12 surrounds the inner tube 11, so that the cross-section through which the fluid flows is annular. Since the solvent is liquid, it can be easily injected irrespective of the shape or width of the cross section. However, when recovering the solvent in which the beneficial minerals are dissolved, the minerals and the surrounding rocks are recovered together. It is preferable to use a wide tube. In this embodiment, the solvent is injected through the outer tube 12 and the solvent in which the beneficial minerals are dissolved is recovered through the inner tube 11, though it may be determined depending on the size of the used double tube.

Since the shielding portion 13 is fitted between the outer wall of the inner tube 11 under the pipe 10 and the inner wall of the outer tube 12, the lower end of the outer tube 12 is separated from the upper portion without being communicated with the upper portion. A plurality of through holes 14 and 15 are formed in the upper and lower portions of the outer tube 12 with the casing 13 therebetween. The upper through-hole 14 is for injecting the solvent into the ore, and the lower through-hole 15 is for withdrawing the solvent. Of course, since the lower end of the outer pipe 12 is open, the solvent in which the beneficial minerals are dissolved can flow into the pipe 10 through the lower end portion. However, the through hole 15 is formed in the lower portion, Solvent was recovered. In some of the pipes, the lower end portion of the pipe is clogged. In this case, the lower through-hole 15 serves as a passage for introducing the solvent into the pipe.

The pipe 10 and the inner wall of the casing 2 or the air wall of the inner casing 1 (when no casing is provided) are closed at the upper or intermediate portion of the pipe 10 using a packer or a piston, From flowing between the pipe 10 and the drill hole 1, and firmly engages the pipe in the drill hole 1.

When the solvent is injected through the outer pipe 12 by using the pipe 10 having the above-described structure, the solvent dissolves the beneficial minerals while diffusing from the mineral deposits. The solvent in which the beneficial minerals are melted passes through the inner pipe 11 to the ground Is recovered.

5, which shows a modification of the first embodiment, an air injection pipe 19 is provided inside the inner pipe 11, May be installed. The injection of high pressure air through the air inlet tube 19 not only promotes the diffusion of the solvent in the mineral phase but also promotes the recovery of the solvent in which the mineral is dissolved to the inner tube 11 by increasing the pressure in the mineral deposit .

On the other hand, in the present invention, there is a technical feature that a turbulent flow is formed by applying a rotational force to a solvent injected into a mineral. To this end, in the present invention, a blade 20 is installed at the lower end of the pipe 10 so that the blade 20 is rotated. In the present embodiment, the blade 20 is changeable in posture between a first posture disposed closely to the pipe 10 and a second posture protruded from the pipe 10. That is, in order to impart rotational force to the solvent, the blade 20 is in a state of being deployed in the second posture, and when the pipe 10 is inserted through the drill hole 1, the blade 20 is folded to the first posture Lt; / RTI > The detailed configuration of the blade 20 will be described again.

As described above, after the pipe 10 is installed, an injection step (M40) for injecting a solvent and a production step (M50) for recovering a solvent in which a beneficial mineral is dissolved are performed. For simplicity of explanation, the injection and the production stages are separated, but the injection of the solvent and the production of the beneficial minerals are performed together in the actual process.

First, a liquid solvent is injected at a high pressure through the outer pipe 12 of the pipe 10. In the case of a triple tube type, when high pressure air is injected together through the air inlet tube, the action of the solvent is discharged along the pipe due to the levitation force of the air. The solvent reaches the stratum where the deposit exists along the outer pipe (12), and then penetrates into cracks formed in the crushing step to dissolve the beneficial minerals in the deposit.

It is not easy to rotate the blade 20 installed on the pipe 10 because the useful mineral starts to melt when starting the solvent injection. Of course, if the diameter of the blade 20 is smaller than the diameter of the mandrel 1, the blade 20 can be rotated simultaneously with the solvent injection.

When the beneficial minerals are dissolved from the vicinity of the drill hole (1) by injecting the solvent, the blade (20) is rotated to form a turbulent flow in the solvent, thereby increasing the diffusing power of the solvent. Even in this case, the direction of rotating the pipe 10 can prevent the blade 20 from being damaged by rotating the pipe in the direction (for example, the clockwise direction) in which the blade 20 is rotated in the second posture. This is because the blade 20 collapses even when the blade 20 hits a wall or rock when the pipe 10 rotates. If the blade 20 is rotated in the reverse direction, the blade 20 can not be folded and continues to be bent toward the second posture, so that the blade 20 may be damaged.

After rotating the pipe 10 and the blade 20 in one direction for a certain period of time, it is preferable to rotate the pipe 10 and the blade 20 in opposite directions. That is, as the mineral is dissolved by injecting the solvent, the space is secured at the position where the blade 20 is located, so that the turbulence can be formed by raising the torque application force through the blade 20 to the highest level. When the pipe 10 is rotated in the direction in which the blade 20 is rotated toward the first posture (for example, counterclockwise), the blade 20 is pressed toward the second posture by the centrifugal force, .

When the solvent is continuously injected, the solvent in which the mineral is dissolved is discharged to the ground through the inner pipe (11). In the ground, a separate system is used to separate the solid rocks mixed in the solvent, to separate the beneficial minerals from the solvent, and then the solvent is injected again to make the circulation process.

The solvent flows into the stratum where the deposit exists and forms turbulence by the blade 20, so that the solvent easily penetrates into the crack (c) formed in the stratum, and the rate of dissolving the beneficial minerals is also increased. As the mineral dissolves, the crack spreads further and diffuses, so the rate of melting of the beneficial minerals is continuously increased, thus speeding up production. In addition, since the dissolution rate is increased, the concentration of useful minerals in the solvent is also increased, so that it is easy to separate the solvent and useful minerals from the ground. In the present invention, by imparting rotational force and turbulent flow to the solvent, the penetration ability of the solvent is improved, thereby improving the dissolution rate and production rate of the mineral. In addition, there is an advantage that the process of separating the solvent and the mineral is facilitated by increasing the concentration of the mineral in the solvent.

In the above, the single drilling method has been described. However, the present invention can be applied to the multiwell method as in the second embodiment shown in FIGS.

FIG. 6 is a schematic view of a multi-well drilling system for performing a circulating dissolution mining method according to a second embodiment of the present invention, FIG. 7 is a view for explaining the multi drilling well arrangement shown in FIG. 6, 8 is a view for explaining a second embodiment of the present invention.

6 to 8, in the second embodiment, a plurality of wells are formed. At least one of the plurality of drilling jigs is used as an injection well 6 for injecting a solvent, and the remaining drill holes are used as a production well 7 for recovering a solvent in which a mineral is dissolved. As shown in Fig. 7, a plurality of production chambers 7 surrounds the injection well 6. Fig.

In the second embodiment, the injection pit 6 and the production pit 7 are formed, the casing 2 is provided, and the crack (c) is formed in the ground layer by crushing, the same as in the first embodiment Do. However, the blade 20 may be provided only in the injection well 6, or both the injection well 6 and the production well 7 may be provided. Unlike the first embodiment, the pipes installed in the injection well 6 and the production well 7 do not have to be double pipes, and a single pipe is sufficient. The solvent is only poured in the pipe provided in the injection well 6 and the solvent in which the mineral is dissolved can be recovered through pumping in the pipe provided in the production chamber 7 so that the pipe does not need to be a double pipe. However, in order to improve the main input of the solvent, a pipe having an air injection pipe may be installed in the injection nozzle. And that a packer (p) is provided between the production well or between the inlet defining wall and the pipe.

In the case of using a plurality of drill holes, as in the case of the single drill hole, when the rotational force is applied to the solvent according to the present invention, the solvent is formed into a turbulent flow, the diffusion rate of the solvent in the layer is increased and the dissolution rate of the useful mineral is also increased . In a single drilling solution, after the beneficial minerals are dissolved, the solvent is pumped back to the original position. However, when a plurality of drilling solutions are used, the solvent dissolves in one direction, There is an advantage.

INDUSTRIAL APPLICABILITY As described above, the present invention has a technical feature in that a turbulence is formed in a solvent by providing a blade in the well and rotating the blade. The construction and rotation of the blades will be described in more detail.

Various methods can be employed to rotate the blade 20. [ For example, as in the present embodiment, the blade 20 may be fixed to a pipe, and the pipe 10 may be rotated to rotate the blade.

The pipe 10 may be rotated as a whole and an upper end portion and a lower end portion of the pipe outer pipe 12 may be rotatably installed so that only the lower end portion of the outer pipe 12 is rotated. That is, the upper end portion and the lower end portion of the outer tube 12 may be relatively rotatably coupled by bearings, and the lower end portion may be connected to a drive shaft (not shown) to rotate only the lower end portion of the pipe. In order to rotate the entire outer tube 12, it is necessary to allow relative rotation between the inner tube of the drill body 1 and the outer tube 12 through a bearing or the like.

Alternatively, only the blade 20 may be rotatably installed in the lower part of the outer tube 12. [ Although not shown, the annular body portion is rotatably supported on the outer tube 12 by a bearing or the like, and the blade is fixed to the body portion. The body portion can be rotated by a separate driving motor or the like. Alternatively, a rotary shaft may be inserted through the interior of the inner tube 11, and a blade coupled to the rotary shaft may be provided at the lower end of the pipe.

That is, in the present invention, if the turbulence can be formed in the solvent through the blades rotating in the inner space, there is no restriction on the mounting position of the outer tube, the lower end of the pipe, etc., There is no particular limitation on the configuration for imparting the rotational force.

In the present embodiment, the blade 20 is fixedly attached to the outer tube 12 of the pipe 10, and the outer tube 12 is rotated. In the present embodiment, the blade 20 has a first posture horizontally disposed with respect to the pipe 10 as shown in Fig. 9 (a), and a second posture horizontally disposed with respect to the pipe 10 as shown in Fig. 9 (b) And the posture can be changed between the second protrusions.

When the blade 20 is installed on the outer circumferential surface of the pipe 10, the blade 20 needs to be changeable between the first posture and the second posture. That is, if the blade 20 is fixedly installed in a protruded state, the diameter of the drill body 1 must be increased more than necessary when the pipe 10 is inserted through the drill hole 1, Is folded in the first posture. In addition, if the blade is fixed, it is preferable that the blade 20 is changeable in posture between the first posture and the second posture because there is a possibility that the blade collides with the drill hole when lowered through the drill hole.

As described above, various means can be employed to make the blade 20 change posture between the first and second positions. In this embodiment, a spring 25 is used. That is, the spring 25 is coupled between the outer tube 12 of the pipe 10 and the blade 20 to elastically press the blade 20 to the second posture. Although not shown, the blade 20 and the outer tube 120 are provided with a locking member such as a hook. When the hook is opened through the switching, the blade 20 is changed to the second posture by the spring 25. That is, the second posture is changed from the first posture that is in close contact with the outer pipe 12 to the second posture that protrudes from the outer pipe 12.

The blade 20 maintains the first posture in close contact with the pipe 10 when the pipe 10 descends through the drill hole 1 and opens the locking member by switching upon completion of the descent of the pipe 10 The posture is changed to the second posture. When the pipe 10 is rotated while maintaining the second posture, it is rotated together to impart rotational force to the solvent. When the work is finished, the pipe is lifted again through the drilling jig. At the time of the pulling, the blade may keep the second posture as it is. That is, when the pipe 10 is pulled up, the blade 20 comes into contact with the air wall of the drill hole 1, but the blade 20 compresses the spring 25 when pressed by the air hole of the drill hole 1, Because the posture of the blade 20 is changed according to the drill hole diameter, the blade 20 is prevented from bending into the wall of the drill hole 1 and being prevented from being damaged or the pipe 10 being pulled up.

In addition, various means other than the spring may be employed in order to make the blade 20 change posture between the first posture and the second posture. For example, small cylinders and pistons may be installed in the pipe to move the blades.

9, the pivot shaft 21 is rotated about the pivot shaft 21 between the first posture and the second posture, It can be arranged obliquely. In addition, as shown in Fig. 10, the pivot shaft 21 may be disposed horizontally with the longitudinal direction of the pipe 10. Fig.

9, when the rotary shaft 21 is inclined, since the surface of the blade 20 is inclined with respect to the horizontal plane, the blade 20 can diffuse the solvent upwardly or downwardly while rotating . That is, when the pipe 10 rotates in one direction, the solvent is pushed outwardly, and when the pipe 10 rotates in the other direction, the solvent is pushed outwardly downward.

10, when the rotating shaft 21 of the blade 20 is parallel to the longitudinal direction of the pipe 10, the surface of the blade 20 is perpendicular to the plane of rotation of the pipe, There is an advantage that a maximum rotational force can be imparted.

As described above, in the present invention, a blade is provided at the lower end of the pipe, and the blade is rotated to form a turbulent flow in the solvent. Solvents formed by turbulence rapidly penetrate the cracks formed in the strata and dissolve the minerals to expand the cracks. The enlarged cracks increase the dissolution rate and production rate of minerals as the contact area between solvent and useful minerals is widened.

According to the present invention, there is an advantage that the rate of production of useful minerals can be increased by increasing the dissolution rate of minerals. Also, as the dissolution rate is increased, the amount of the mineral dissolved in the same amount of solvent increases as compared with the conventional dissolution mining method, so that the concentration of the mineral in the solvent increases, so that it is advantageous in that the recovery of the minerals from the solvent is facilitated.

Although the blade has been described as being fixed to the lower end of the pipe and rotating the pipe itself as a method for forming a turbulent flow in the solvent, the pipe is rotated in a fixed state with different mechanical configurations. Can be adopted. It is also possible to rotate the blades only by introducing the blades only through the inside of the pipes without physically coupling the blades with the pipes.

On the other hand, ultrasonic waves may be irradiated to the solvent at the same time as the rotational force is imparted, or the action of penetrating the cracks of the stratum by the application of high frequency may be promoted.

In addition, although the blade 20 has been described and shown as being constant in size, the size of the blades can be increased to enlarge the spreading force to the solvent when the free space is enlarged by recording a portion of the useful minerals. For example, after the blades are made into a multi-folded structure and the expansion of the mineral due to the dissolution of the minerals in the strata is achieved, the blades may be unfolded to increase the length.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation and that those skilled in the art will recognize that various modifications and equivalent arrangements may be made therein. It will be possible. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

M10 ... Drilling step M20 ... Crushing step
M30 ... pipe installation step M40 ... injection step
M50 ... Production stage 1 ... drilling
2 ... Casing 6 ... Injection
7 ... Production 10 ... Pipe
11 ... inner tube 12 ... outer tube
13 ... shielding part 14,15 ... through hole
19 ... air inlet tube 20 ... blade
21 ... Pivot shaft 25 ... spring
g ... ground c ... crack

Claims (11)

A drilling step in which a drill hole is formed through excavation to an ore with dense beneficial minerals to be mined;
A crushing step of injecting crushing equipment through the drilling well to form a crack in the deposit;
An injection step of injecting a pipe up to the lower part of the drilling well and injecting a solvent capable of melting the beneficial mineral to the deposit through the pipe so as to increase the diffusion force of the solvent by applying a rotational force to the solvent discharged from the pipe, ; And
And recovering the solvent in which the beneficial minerals are dissolved,
A blade is coupled to a lower portion of the pipe,
The blade is rotated to impart rotational force to the solvent,
Wherein the pipe is a double pipe having an inner pipe and an outer pipe, a shielding member is installed at a lower end portion of the outer pipe so that the lower end of the inner pipe is isolated, After the solvent was injected,
The inner tube may further include an air injection pipe for injecting high-pressure air,
In the injecting step, the high pressure air is injected together through the air injection tube while injecting the solvent,
Wherein the blade is rotatably coupled to the pipe such that the blade is changeable between a first posture disposed horizontally to the pipe and a second posture disposed to project from the pipe,
Wherein a spring is coupled between the pipe and the blade such that the spring elastically presses the blade to the second posture. delete delete delete The method according to claim 1,
Wherein at least two drill holes are formed so as to be spaced apart from each other, the pipe is installed in each drill hole,
Characterized in that at least one of the drilling jets is used as an injection well for injecting the solvent and at least one other drilling well is used as a production well for recovering a solvent in which the beneficial minerals are dissolved . 6. The method of claim 5,
A plurality of production tablets are formed,
Wherein the product tablets are spaced apart from each other around the drill hole. delete delete The method according to claim 1,
Wherein the rotating shafts of the blades are formed in parallel to the longitudinal direction of the pipe. 10. The method of claim 9,
Wherein the pipe is rotated in a first direction toward the first posture and then in a second direction opposite to the first direction for a predetermined period of time at the beginning of the injection step, Way. The method according to claim 1,
Wherein the blade is disposed obliquely with respect to the longitudinal direction of the pipe,
Wherein the rotating direction of the blade is adjusted in the injecting step so that the solvent can be diffused upward or downward.

Images