An apparatus for high-pressure liquid injection in an in-situ leaching uranium mine

Abstract

An apparatus for high-pressure liquid injection in an in-situ leaching uranium mine, comprising a high-voltage frequency converter and a liquid injection pump. The high-voltage frequency converter is connected to the liquid injection pump. The liquid injection pump is connected to the left end of a U-shaped liquid injection branch pipe through a pipeline, and the right end of the U-shaped liquid injection branch pipe is connected to a liquid injection branch pipe joint. There is a threaded gland on the liquid injection branch pipe joint. The lower end of the threaded gland is connected to a gland joint, and the lower end of the gland joint is a wellhead pipe coupling; the lower end of the wellhead pipe coupling is connected to a liquid injection wellhead.

Description

Technical Field

[0001] The present technology relates to a high-pressure liquid injection technology for in-situ leaching uranium mines, and in particular to a method for realizing high-pressure liquid injection for in-situ leaching uranium mines. Background Art

[0002] In-situ leaching uranium mining technology is a new uranium mining process that integrates mining, selection and smelting. It is currently widely used in uranium mining at home and abroad. This method first requires the leaching agent to be injected into the ore layer from the injection well of the well field, so that the leaching agent and the uranium in the ore layer can fully react, and then it is brought to the surface through the well field pumping well. For ore deposits with low pressure head, the injection well is not pressurized, and the injection can be done by gravity flow. However, for ore deposits with high pressure head, the gravity flow injection method can no longer be used for injection. In this case, a pressurized injection method must be used, and the injection wellhead device must also be able to withstand a certain pressure without cracking or leakage of the solution.

[0003] At present, most of the methods of liquid injection rely on gravity self-flow, or only use low-pressure and low-power liquid injection pumps to pump the leaching liquid in the liquid distribution pool to the injection wells in the well site. At present, most of the liquid injection wellhead devices use the method of wrapping the liquid injection branch pipe with tape and then pressing it tightly in the fixed casing by friction. This method reduces the friction force due to the aging of the tape, resulting in loose fixation. This device uses the method of wrapping raw tape around the connection part for sealing, which leads to loose sealing due to the aging and damage of the raw tape. Summary of the invention

[0004] The purpose of the present invention is to provide a method and device for high-pressure liquid injection in an in-situ leaching uranium mine, by adopting a high-voltage frequency converter to tow a liquid injection pump to achieve high-pressure liquid injection, and to provide a high-pressure liquid injection device capable of bearing pressure.

[0005] The technical scheme of the present invention is as follows: a high-pressure liquid injection device for in-situ leaching uranium mines, comprising a high-voltage frequency converter and a liquid injection pump, wherein the high-voltage frequency converter is connected to the liquid injection pump, the liquid injection pump is connected to the left end of a U-shaped liquid injection branch pipe through a pipeline, and the right end of the U-shaped liquid injection branch pipe is connected to a liquid injection branch pipe joint, a threaded gland is arranged on the liquid injection branch pipe joint, the lower end of the threaded gland is connected to a gland joint, the lower end of the gland joint is a wellhead pipe clamp, and the lower end of the wellhead pipe clamp is connected to the liquid injection wellhead.

[0006] The wellhead pipe clamp, gland joint, injection branch pipe joint and threaded gland are all connected by threaded fastening.

[0007] There are two high-pressure injection pumps, 10KV.

[0008] The wellhead pipe clamp is made of woolen material, and the outer diameter of the joint is consistent with the inner diameter of the wellhead pipe clamp, which is 96.5mm.

[0009] The wellhead pipe clamp is made of PVC, and the outer diameter of the joint is consistent with the inner diameter of the wellhead pipe clamp, which is 160mm.

[0010] The liquid injection branch pipe joint is made of iron. There are barbs all over the lower connecting head. The barb slope is 8 degrees and the barb joint length is 65 mm.

[0011] The liquid injection branch pipe joint is made of iron. There are barbs all over the lower connecting head. The barb slope is 15 degrees and the barb joint length is 108 mm.

[0012] The threaded gland is made of woolen fabric.

[0013] The threaded gland is made of PVC.

[0014] By adjusting the frequency of the high-voltage inverter, the liquid injection pressure is stabilized at 1.3 MPA.

[0015] The remarkable effect of the present invention is as follows: It provides a method and device for high-pressure liquid injection in in-situ leaching uranium mines, which solves the problem that the liquid injection method of gravity flow cannot be realized for deposits with high confined water heads. The present invention realizes high-pressure liquid injection by using a 10KV high-voltage inverter to drive a liquid injection pump, and pressurizes and pumps the leaching solution in the mixing tank to the well site.

[0016] The liquid injection branch pipe is fixed on the fixing device by a method of tightening to increase friction, which will cause the friction to decrease and the fixing to become loose due to external forces. The present invention fixes the liquid injection branch pipe in the device by a method of thread fastening, and the fixing is firm. The present invention also solves the problem of poor sealing caused by the method of winding raw material tape for sealing at the connection part in the past. The present invention designs a bracket at the connection part and installs a leather gasket in the bracket, and seals by tightening the leather gasket in the bracket through thread fastening, so as to prevent the solution at the wellhead from leaking. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the device for high-pressure liquid injection in in-situ leaching uranium mines;

[0018] Figure 2 It is a schematic diagram of the liquid injection branch pipe joint of the device for high-pressure liquid injection in in-situ leaching uranium mines;

[0019] In the figure: 1 high-voltage inverter, 2 liquid injection pump, 3 wellhead pipe coupling, 4 gland joint, 5 liquid injection branch pipe joint, 6 threaded gland, 7 pipeline, 8 U-shaped liquid injection branch pipe. Detailed Embodiments

[0020] A device for high-pressure liquid injection in an in-situ leaching uranium mine, including a high-voltage frequency converter 1 and a liquid injection pump 2. The high-voltage frequency converter 1 is connected to the liquid injection pump 2. The liquid injection pump 2 is connected to the left end of a U-shaped liquid injection branch pipe 8 through a pipeline 7, and the right end of the U-shaped liquid injection branch pipe 8 is connected to a liquid injection branch pipe joint 5. There is a threaded gland 6 on the liquid injection branch pipe joint 5. The lower end of the threaded gland 6 is connected to a gland joint 4, and the lower end of the gland joint 4 is a wellhead pipe coupling 3. The wellhead pipe coupling 3, the gland joint 4, the liquid injection branch pipe joint 5, and the threaded gland 6 are all tightly connected by threads. The lower end of the wellhead pipe coupling 3 is connected to the liquid injection wellhead.

[0021] Example 1:

[0022] There are two high-pressure liquid injection pumps 2, 10KV. By adjusting the frequency of the high-voltage frequency converter 1, the liquid injection pressure is stabilized at 1.3 MPA.

[0023] The wellhead pipe coupling 3 is made of nylon. Its inner diameter is the same as the outer diameter of the liquid injection wellhead pipe, which is 96.5 mm. It has threads inside and a support groove in the middle, and a leather gasket is installed in its support groove.

[0024] The gland joint 4 is made of nylon. Its joint outer diameter is the same as the inner diameter of the wellhead pipe coupling 3, which is 96.5 mm. It is shaped like a round head bolt, hollow inside, the inner diameter of the upper half is larger than that of the lower half, and a support groove is formed at the reduced diameter part and a leather gasket is installed.

[0025] The liquid injection branch pipe joint 5 is made of iron. The lower connecting part is covered with barbs. The barb slope is 8 degrees, and the barb joint is 65 mm long. The in-well pipe of the liquid injection branch pipe and the lower joint are firmly fixed by pressing, and the upper joint is connected to the surface pipe of the liquid injection branch pipe through bolts.

[0026] The threaded gland 6 is made of nylon. It is shaped like a round head bolt, hollow inside, and the outer diameter of the screw is consistent with the inner diameter of the upper half of the gland joint 4, which is 70 mm.

[0027] In a certain in-situ leaching uranium mine, the groundwater of the ore deposit belongs to a confined aquifer, the water level burial depth is 66 m, the liquid injection well depth is 290 m, and the outer diameter of the liquid injection wellhead pipe is 96.5 mm.

[0028] Example 2:

[0029] By adjusting the frequency of the high-voltage frequency converter 1, the liquid injection pressure is stabilized at 1.5 MPA.

[0030] The wellhead pipe coupling 3 is made of PVC. Its inner diameter is the same as the outer diameter of the liquid injection wellhead pipe, which is 160 mm. It has threads inside and a support groove in the middle, and a leather gasket is installed in its support groove.

[0031] The gland joint 4 is made of PVC. Its joint outer diameter is the same as the inner diameter of the wellhead pipe coupling 3, which is 160 mm. It is shaped like a round head bolt, hollow inside, the inner diameter of the upper half is larger than that of the lower half, and a support groove is formed at the reduced diameter part and a leather gasket is installed.

[0032] The liquid injection branch pipe joint 5 is made of iron. There are barbs all over the lower joint. The barb slope is 15 degrees and the barb joint length is 108 mm. The in-well pipe of the liquid injection branch pipe and the lower joint are firmly fixed by pressing. The upper joint is connected to the surface pipe of the liquid injection branch pipe by bolts.

[0033] The threaded gland 6 is made of PVC, shaped like a round head bolt, hollow inside. The outer diameter of the screw is consistent with the inner diameter of the upper half of the gland joint 4, which is 88 mm.

Claims

1. A device for high-pressure liquid injection in an in-situ leaching uranium mine, characterized in that: It includes a high-voltage frequency converter (1) and a high-pressure liquid injection pump (2). The high-voltage frequency converter (1) is connected to the high-pressure liquid injection pump (2). The high-pressure liquid injection pump (2) is connected to the left end of a U-shaped liquid injection branch pipe (8) through a pipeline (7). The right end of the U-shaped liquid injection branch pipe (8) is connected to a liquid injection branch pipe joint (5). There is a threaded gland (6) on the liquid injection branch pipe joint (5). The lower end of the threaded gland (6) is connected to a gland joint (4). The lower end of the gland joint (4) is a wellhead pipe clamp (3). The lower end of the wellhead pipe clamp (3) is connected to a liquid injection wellhead. There are two high-pressure liquid injection pumps (2) in total. The wellhead pipe clamp (3) is made of nylon, has internal threads and a bracket in the middle, and a leather gasket is installed in its bracket. The gland joint (4) is made of nylon. The outer diameter of its joint is the same as the inner diameter of the wellhead pipe clamp (3), which is 96.5 mm. It is shaped like a round head bolt, is hollow inside, the inner diameter of the upper half is larger than that of the lower half, and a bracket is formed at the variable diameter part and a leather gasket is installed. The liquid injection branch pipe joint (5) is made of iron. The lower connecting head is covered with barbs. The barb slope is 8 degrees and the barb joint length is 65 mm. The threaded gland (6) is made of nylon, is shaped like a round head bolt, is hollow inside, and its outer diameter fits the inner diameter of the upper half of the gland joint (4), which is 70 mm. The injection pressure is stabilized at 1.3 MPa by adjusting the frequency of the high-voltage frequency converter (1). The wellhead pipe clamp (3), the gland joint (4), the liquid injection branch pipe joint (5), and the threaded gland (6) are all tightly connected by threads.

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