Underground negative pressure sand suction device for in-situ leaching uranium mining
By designing a negative pressure sand suction device for uranium mining underground, and combining negative pressure sand suction and sand stirring technologies, the problems of low underground sand output efficiency and difficulty in lowering ventilation pipes have been solved, achieving efficient underground sand removal and energy consumption reduction.
Patent Information
- Application Number
- CN202422690801.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-05
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-11-05
AI Technical Summary
In existing in-situ leaching uranium mining processes, sand production is a common problem, resulting in low sand removal efficiency, high energy consumption, and difficulty in lowering air ducts in deep wells in one go, making conventional air compressor well cleaning ineffective.
A negative pressure sand suction device for uranium mining wells under in-situ leaching was designed, including a duct joint, a pressure dividing column, a pressure relief valve, an inclined jet pipe, a swirling sand suction head, and a sand stirring assembly. By combining negative pressure sand suction and sand stirring, the efficiency of sand removal in the well is improved, and difficulties in lowering the duct and blockage of the grouting pipe are avoided.
It improved the efficiency of downhole sand removal, solved the problems of difficult air duct lowering and grouting pipe blockage, achieved efficient downhole sand removal, and reduced energy consumption.
Smart Images
Figure CN223562784U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of in-situ leaching uranium mining, in particular to an in-situ leaching uranium mining downhole negative pressure sand suction device. BACKGROUND
[0002] In-situ leaching uranium mining is the main mining process of natural uranium in China. After the uranium-containing leaching solution is lifted to the ground through a large number of liquid pumping boreholes, a series of treatment processes are carried out. The downhole sand production of each borehole is a common problem, and the borehole needs to be washed and desanded to restore the permeability of the ore bed and ensure the normal pumping and injection volume.
[0003] Currently, the following problems exist in the use of air compressors for well washing and sand removal in production sites such as mines:
[0004] Due to the liquid buoyancy, it is difficult to lower the air pipe into the deep well at one time, and it is usually lowered to the general first compressed air is introduced to drain the liquid, and then lowered multiple times until the ore bed.
[0005] This method is relatively extensive, and the downhole sand is lifted to the ground in the form of a slug, the three-phase flow velocity is slow, resulting in poor sand carrying effect, and a long time is needed to complete sand removal, which is low in efficiency and high in energy consumption. UTILITY MODEL CONTENTS
[0006] The purpose of the utility model is to improve the above problems. In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
[0007] A downhole negative pressure sand suction device for in-situ leaching uranium mining, comprising:
[0008] A wind pipe joint connected to the end of the wind pipe;
[0009] A pressure dividing column connected to the lower end of the wind pipe joint;
[0010] A pressure relief valve provided at the lower end of the pressure dividing column;
[0011] A blow and jet inclined pipe with one end connected to the side of the pressure dividing column;
[0012] A three-phase mixing column parallel to the pressure dividing column, the other end of the blow and jet inclined pipe is connected to the side of the three-phase mixing column; a grouting pipe joint is connected to the upper end of the three-phase mixing column, and the lower end of the grouting pipe joint is welded or threadedly connected to the three-phase mixing column;
[0013] A spiral sand suction head provided at the lower end of the three-phase mixing column, and a plurality of slits are obliquely formed on the side surface;
[0014] A sand stirring assembly connected to the pressure relief valve.
[0015] Optionally, the included angle between the leakage injection inclined pipe and the pressure distribution column is ≤60°, and the outer diameter of the leakage injection inclined pipe is ≤40mm.
[0016] Optionally, the slit is obliquely arranged along the surface of the rotational sand suction head.
[0017] Optionally, the included angle between the slit and the axis of the three-phase mixing column is ≥60°, the width of the slit is 0.5mm-2mm, and the length of the slit is ≥2cm.
[0018] Optionally, a one-way valve plate is arranged inside the three-phase mixing column, and the one-way valve plate is arranged below the connection between the three-phase mixing column and the leakage injection inclined pipe.
[0019] Optionally, the sand stirring assembly comprises a sand stirring paddle and a paddle support, the sand stirring paddle is connected to the pressure distribution column and / or the rotational sand suction head through the paddle support, and the sand stirring paddle is connected to the pressure relief valve through an air pipe.
[0020] Optionally, the distance between the upper end of the sand stirring paddle and the rotational sand suction head is ≤300mm.
[0021] Optionally, the sand stirring paddle is a three-blade propeller.
[0022] Optionally, the upper end of the three-phase mixing column is connected with a grouting pipe joint, the outer diameter of the grouting pipe joint is ≤50mm, and the outer diameter of the three-phase mixing column is ≤40mm.
[0023] Optionally, the outer diameter of the downhole negative pressure sand suction device for in-situ leaching of uranium is ≤110mm.
[0024] The beneficial effects of the utility model are as follows:
[0025] The downhole negative pressure sand suction device for in-situ leaching of uranium in the application uses a grouting pipe to transport sand-carrying liquid, greatly improves the wellhead liquid-solid two-phase flow rate, improves the downhole sand removal efficiency, and combines the rotational sand suction head arranged at the bottom end of the device with the sand stirring assembly, so that the settled sand is stirred up and fully mixed with the liquid phase, and then is sucked into the three-phase mixing column through the rotational slit, the proportion of the sucked particles can be controlled, the problems such as blockage of the grouting pipe, insufficient gas lift negative pressure and backfall of the particles along the inner wall of the grouting pipe caused by the straight-through type open sand suction are avoided, and the air pipe can be lowered together with the grouting pipe through a drilling machine or a crane, so that the problem that the air pipe cannot be lowered at one time due to buoyancy during well washing by a conventional air compressor is solved.
[0026] Other features and advantages of the utility model will be described in the subsequent description, and some of them will become apparent from the description or be understood through the implementation of the utility model embodiments. BRIEF DESCRIPTION OF DRAWINGS
[0027] Figure 1It is a working schematic diagram of the in-situ leaching uranium underground negative pressure sand suction device of the embodiment of the present application.
[0028] Figure 2 It is a structural schematic diagram of the in-situ leaching uranium underground negative pressure sand suction device of the embodiment of the present application.
[0029] Figure 3 It is a slit structure schematic diagram of the rotating sand suction head of the embodiment of the present application.
[0030] Symbol explanation: 1. Air compressor; 2. Casing; 3. Air pipe; 401. Jetting inclined pipe; 402. Air pipe joint; 403. Pressure dividing column; 404. Pressure relief valve; 405. Paddle support; 406. Air pipe; 407. Sand stirring paddle; 408. Rotating sand suction head; 409. Three-phase mixing column; 410. One-way valve plate; 411. Grouting pipe joint; 5. Filter; 6. Sediment; 7. Sediment pipe; 8. Grouting pipe. DETAILED DESCRIPTION
[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0032] In the present application, the technical features described in an open manner include both the closed technical solution consisting of the listed features and the open technical solution containing the listed features.
[0033] Under the existing drilling structure and technical conditions, the in-situ leaching sand is inevitable, and therefore the in-situ sediment removal has gradually become the main task of the well site operation and maintenance.
[0034] At present, the main way to clean the sediment is to rely on various well washing processes. Air compressors, piston washers and submersible pump washers are commonly used in mine production sites.
[0035] The piston washing is to lower a piston in the casing and make piston movement in the casing through the traction of the steel wire rope. When the piston is lifted, the sand and the blockage in the mine layer are sucked out. In the next piston lowering, part of the sand is transported to the upper part of the piston, and is lifted to the ground with the liquid when the piston is lifted. In the continuous reciprocating movement, the sediment is gradually cleaned. However, this sand removal process has high requirements for cementing quality, and is prone to problems such as casing uphole, coupling gas leakage and the like, which adversely affect the sand removal effect, and the operation is difficult when the well depth is deep.
[0036] Submersible pump well washing is through the suction end of submersible pump suction, change the flow of liquid in the well to disturb the sand, sand and liquid into the submersible pump inside and then be lifted to the ground; due to the large depth of the ore bed in recent years, the submersible pump cannot be lowered to the bottom of the well to pump sand, so the sand removal efficiency of this method is too low, and when the sand content is too large, the impeller of the submersible pump is easy to be damaged; and the huge amount of water lifted to the ground also needs to be separated and injected into the well; the cost of high-lift large-flow submersible pump is about 20-30 thousand yuan, and the maintenance cost is high after damage.
[0037] There are two key points in using air compressor to wash well: one is to create negative pressure, the water flow outside the filter rushes in at a faster speed, which can suck out the fine particles attached to the filter and gravel layer, thereby improving the water permeability of the filter; the second is to inject compressed air through the ore bed, which can stir and lift the bottom sand and other impurities to the ground surface through high-speed gas-liquid plug flow. This process requires a large depth of air pipe (usually straight to the ore bed) to produce a large hydraulic pressure difference.
[0038] Referring to Figure 1 and Figure 2 The application provides a downhole negative pressure sand suction device for in-situ leaching of uranium, comprising:
[0039] The air pipe joint 402 is connected to the end of the air pipe 3.
[0040] The pressure dividing column 403 is connected to the lower end of the air pipe joint 402.
[0041] The pressure relief valve 404 is arranged at the lower end of the pressure dividing column 403.
[0042] The jetting inclined pipe 401 is connected to the side of the pressure dividing column 403.
[0043] The three-phase mixing column 409 is parallel to the pressure dividing column 403, and the other end of the jetting inclined pipe 401 is connected to the side of the three-phase mixing column 409; the jetting inclined pipe 401 extends obliquely upward from the side of the pressure dividing column 403.
[0044] The spiral sand suction head 408 is arranged at the lower end of the three-phase mixing column 409, and a plurality of slits are obliquely arranged on the side of the spiral sand suction head 408.
[0045] The sand stirring assembly is connected to the pressure relief valve 404.
[0046] The grouting pipe 8 and the air pipe 3 are both commonly used devices in a drilling site. The sand removing device is designed on the basis of the commonly used devices, and the investment cost is low. The grouting pipe 8, the downhole negative pressure sand suction device and the air pipe 3 can be connected in advance on the ground. The air pipe 3 is placed into the casing 2 together with the grouting pipe 8 through a drilling machine or a crane. The end of the casing 2 is a filter 5. The filter 5 is placed into the sand setting pipe 7. The placement depth is determined according to the observation result of the downhole television and the position of the filter 5. Generally, the placement depth is 0.5-1 m above the sand setting 6.
[0047] Preferably, the outer diameter of the downhole negative pressure sand suction device for in-situ leaching of uranium is less than or equal to 110 mm, which ensures the smooth construction in the in-situ leaching process well with an inner diameter of 128 mm.
[0048] As an optional embodiment, the air pipe joint 402 is made of brass or stainless steel, the maximum outer diameter is less than or equal to 50 mm, and the pressure resistance is greater than or equal to 10 MPa. The lower end of the air pipe joint 402 is welded with the pressure dividing column 403, and the upper end is connected with the end of the air pipe 3 through a thread. The other end of the air pipe 3 is connected with the air compressor 1, so that the high-pressure gas generated by the air compressor 1 is transmitted to the pressure dividing column 403.
[0049] As an optional embodiment, the pressure dividing column 403 is made of 304 stainless steel, the outer diameter of the pressure dividing column 403 is less than or equal to 40 mm, and the pressure resistance is greater than or equal to 10 MPa. The upper end, the side and the lower end of the pressure dividing column 403 are respectively provided with an opening. The three openings are respectively connected with the air pipe joint 402, the jetting inclined pipe 401 and the pressure relief valve 404.
[0050] The jetting inclined pipe 401 is used to connect the pressure dividing column 403 and the three-phase mixing column 409, so that the high-pressure gas is transmitted to the three-phase mixing column 409. The pressure dividing column 403 and the three-phase mixing column 409 are connected through welding. The included angle between the jetting inclined pipe 401 and the pressure dividing column 403 is less than or equal to 60°. The outer diameter of the jetting inclined pipe 401 is less than or equal to 40 mm, and the pressure resistance is greater than or equal to 10 MPa.
[0051] As an optional embodiment, the pressure relief valve 404 is made of brass or stainless steel. The pressure relief adjustment range is 2-6 MPa. The air inlet end of the pressure relief valve 404 is connected with the pressure dividing column 403 through a thread with a size of M15-M21. The lower end of the air outlet of the pressure relief valve 404 is connected with a stainless steel pneumatic pipe or a non-metal high-pressure gas pipe.
[0052] Preferably, the sand stirring assembly includes a sand stirring paddle 407 and a paddle support 405. The sand stirring paddle 407 is connected to the pressure dividing column 403 and / or the rotational sand suction head 408 through the paddle support 405. The sand stirring paddle 407 is connected to the pressure relief valve 404 through a gas pipe.
[0053] The distance between the upper end of the sand stirring paddle 407 and the rotational sand suction head 408 is less than or equal to 300 mm, so that the stirred downhole sand setting 6 can be sucked into the three-phase mixing column 409.
[0054] Specifically, the sand stirring paddle 407 is a three-blade propeller, which is connected to the above-mentioned stainless steel pneumatic pipe or non-metal high-pressure gas pipe and is driven by the output gas of the pressure relief valve 404. The working outer diameter is ≤75 mm, the rotating speed is ≤300 rpm, and the paddle outer diameter coverage range is less than the projection area of the sand suction device (to avoid contact with the casing 2 or the filter 5 during rotation).
[0055] The rotating sand suction head 408 is made of brass or stainless steel and is a hollow cylinder with a closed lower end and an open upper end. The upper end is threadedly connected to the three-phase mixing column 409, and a plurality of slits are obliquely formed on the side surface, as shown in Figure 3 The angle between the slits and the axis of the three-phase mixing column 409 is ≥60°, the slit width ranges from 0.5 mm to 2 mm, and the slit length of each slit is ≥2 cm. The sand 6 is stirred by the sand stirring paddle 407 and fully mixed with the liquid phase, and is sucked into the three-phase mixing column 409 through the rotating slits. The proportion of particles sucked can be controlled, and problems such as blockage of the grouting pipe 8, insufficient gas lift negative pressure, and particles falling back along the inner wall of the grouting pipe 8 caused by straight-through open sand suction can be avoided.
[0056] As an optional embodiment, the three-phase mixing column 409 is made of brass or stainless steel, with an outer diameter ≤40 mm and a pressure resistance ≥10 MPa. The upper end, side surface, and bottom end of the three-phase mixing column 409 are open and connected to the grouting pipe joint 411, the jet inclined pipe 401, and the rotating sand suction head 408, respectively. See Figure 2 A one-way valve plate 410 is installed inside the three-phase mixing column 409 and below the connection between the three-phase mixing column 409 and the jet inclined pipe 401. The one-way valve plate 410 opens upward and is made of brass or stainless steel. It is gap-fitted with the inner wall of the three-phase mixing column 409 and is closed under the action of natural gravity. When the pressure difference between the top and bottom of the one-way valve plate 410 exceeds 0.1 MPa, the valve plate opens. When the operation is completed or the equipment is unexpectedly shut down, the one-way valve plate 410 automatically closes, and the sand 6 moving upward in the pipe is separated by the one-way valve plate 410 and does not flow back to the bottom of the well, avoiding the accumulation of secondary sand 6.
[0057] The grouting pipe joint 411 is connected to the upper end of the three-phase mixing column 409 and is made of brass or stainless steel. The upper end of the grouting pipe joint 411 is threadedly connected to the grouting pipe 8, and the lower end is welded or threadedly connected to the three-phase mixing column 409. The maximum outer diameter of the grouting pipe joint 411 is ≤50 mm, and the pressure resistance is ≥10 MPa.
[0058] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A negative pressure sand suction device for uranium mining underground, characterized in that, include: Duct (3) connector, wherein the duct (3) connector is connected to the end of the duct (3); Pressure dividing column (403), the pressure dividing column (403) is connected to the lower end of the duct (3) joint; Pressure relief valve (404), wherein the pressure relief valve (404) is disposed at the lower end of the pressure dividing column (403); A venting jet pipe (401), one end of which is connected to the side of the pressure dividing column (403); A three-phase mixing column (409) is parallel to the pressure dividing column (403), and the other end of the venting jet pipe (401) is connected to the side of the three-phase mixing column (409); a grouting pipe joint (411) is connected to the upper end of the three-phase mixing column (409), and the lower end of the grouting pipe joint (411) is welded or threaded to the three-phase mixing column (409); A swivel suction head (408) is provided at the lower end of the three-phase mixing column (409), and multiple slits are obliquely opened on its side. A sand-stirring assembly, which is connected to the pressure relief valve (404).
2. The underground negative pressure sand suction device for uranium leaching mining according to claim 1, characterized in that, The angle between the relief jet pipe (401) and the pressure dividing column (403) is ≤60°, and the outer diameter of the relief jet pipe (401) is ≤40mm.
3. The underground negative pressure sand suction device for uranium leaching mining according to claim 1, characterized in that, The slit is opened obliquely along the surface of the rotating suction head (408).
4. The underground negative pressure sand suction device for uranium leaching mining according to claim 3, characterized in that, The angle between the slit and the axis of the three-phase mixing column (409) is ≥60°, the width of the slit is 0.5mm-2mm, and the length of the slit is ≥2cm.
5. The underground negative pressure sand suction device for uranium mining according to claim 1, characterized in that, The three-phase mixing column (409) is provided with a one-way valve plate (410), which is located below the connection between the three-phase mixing column (409) and the discharge jet pipe (401).
6. The underground negative pressure sand suction device for uranium leaching mining according to claim 1, characterized in that, The sand stirring assembly includes a sand stirring blade (407) and a blade support (405). The sand stirring blade (407) is connected to the pressure dividing column (403) and / or the swirling sand suction head (408) via the blade support (405). The sand stirring blade (407) is connected to the pressure relief valve (404) via an air pipe (406).
7. A negative pressure sand suction device for uranium mining underground according to claim 6, characterized in that, The distance between the upper end of the sand-stirring blade (407) and the swirling sand-suction head (408) is ≤300mm.
8. A negative pressure sand suction device for uranium mining underground according to claim 6, characterized in that, The sand-stirring blade (407) is a three-bladed propeller.
9. A negative pressure sand suction device for uranium mining underground according to claim 1, characterized in that, The outer diameter of the grouting pipe joint (411) is ≤50mm, and the outer diameter of the three-phase mixing column (409) is ≤40mm.
10. A negative pressure sand suction device for uranium mining underground according to claim 1, characterized in that, The outer diameter of the underground negative pressure sand suction device for uranium leaching is ≤110mm.