Wellhead sealing device of in-situ leaching uranium mining liquid injection well

Abstract

The utility model mainly relates to the technical field of in-situ leaching uranium mining, in particular to a wellhead sealing device of an in-situ leaching uranium mining liquid injection well. In the process of injecting the leaching solution into the ore bed, a certain pressure is generally required to be applied, so that the reliability of pipeline connection is ensured, and the leaching solution is prevented from leaking. Original screw threads are prone to being damaged in the disassembly and assembly process, and optimization and improvement are carried out on the screw thread assembly. The sealing piece 1 is mainly composed of a screw thread 2, a sealing ring 3 and a flange 4. And the thread form and the thread pitch of the screw thread 2 are matched with the well casing 7 of the liquid injection well. In the assembling process, the sealing ring 3 is installed in the sealing ring clamping groove in the sealing piece 1, then the sealing piece 1 is screwed into the liquid injection well pipe 7, the sealing gasket 6 is arranged on the flange 4 in a centering mode, the liquid injection pipeline 5 and the flange of the sealing piece 1 are aligned and fastened through a bolt, and assembling is completed. According to the device, the disassembly and assembly efficiency and the sealing performance are improved, and the damage frequency is reduced.

Description

Technical Field

[0001] This invention mainly relates to the field of in-situ leaching uranium mining technology, specifically a wellhead sealing device for in-situ leaching uranium injection wells. Background Technology

[0002] In the process of in-situ leaching uranium production, both the injection of leaching solution into the ore layer and the extraction of uranium-bearing leaching solution are carried out through "wells" constructed from the surface to the ore layer. During the injection of leaching solution into the ore layer, a certain pressure is generally required. Ensuring the reliability of pipeline connections and preventing leaching solution leakage during this process has always been a key concern for industry professionals. During use, it was found that traditional existing threaded connections were easily damaged during disassembly and reassembly, therefore, optimizations and improvements were made. Summary of the Invention

[0003] 1. Purpose

[0004] This invention designs a sealing device for the connection between the injection well and the injection pipeline in uranium leaching, in order to improve the disassembly and assembly efficiency and sealing performance of the original device and reduce its damage frequency.

[0005] 2. Technical Solution

[0006] A sealing device for a uranium injection well in in-situ leaching mining comprises a sealing element 1 mainly consisting of a thread 2, a sealing ring 3, and a flange 4. The thread profile and pitch of the thread 2 should match the well casing 7 of the injection well. During assembly, the sealing ring 3 is first inserted into the sealing ring groove in the sealing element 1, then the sealing element 1 is screwed into the well casing 7, the sealing gasket 6 is then aligned and placed on the flange 4, and finally the injection pipeline 5 is aligned with the flange of the sealing element 1 and tightened with bolts to complete the assembly.

[0007] 3. Effects

[0008] This sealing device achieves a seal with the injection well casing using a sealing ring, providing high sealing pressure. It eliminates the need for Teflon tape during assembly and disassembly, significantly improving efficiency. The connection between the sealing device and the injection pipeline uses a flange, avoiding the problem of easily damaged nylon threads during bolt installation and removal, thus reducing the frequency of seal damage and maintenance costs. Attached Figure Description

[0009] Figure 1 Front view of a sealing device for an injection well in ground immersion

[0010] Figure 2 A top view of a sealing device for an injection well used in ground immersion.

[0011] Figure 3 Assembly diagram of a sealing device component for a ground immersion injection well

[0012] Figure 4 Assembly results Detailed Implementation

[0013] In a local uranium leaching mine, the leaching solution is a sulfuric acid solution with a concentration of 10–20 g / L, and the injection pressure is 0.6–0.7 MPa. The injection pipe has a diameter of DN40 and is fitted with a flange of the corresponding size. The injection well pipe has a diameter of φ148 and is threaded with a rectangular external thread. This device is applied to the sealing connection between the injection pipe 5 and the injection well pipe 7. First, a φ180 mm nylon rod is used to machine an internal thread matching the thread of the injection well pipe 7 and a sealing ring groove at one end, and a flange matching the injection pipe 5 at the other end. During assembly, a 10 mm wide nitrile sealing ring 3 is first inserted into the sealing ring groove in the sealing element 1. Then, the sealing element 1 is screwed into the injection well pipe 7. Next, the fluororubber sealing gasket 6 is centered and placed on the flange 4. Finally, the injection pipe 5 is aligned with the flange of the sealing element 1 and tightened with bolts to complete the assembly.

[0014] The device was used in the sealing connections of nearly 300 injection wells in the uranium leaching mine, providing a tight and reliable seal and completely avoiding the problem of the entire sealing device becoming unusable due to thread damage. The installation time for a single device was also reduced from 15 minutes to 8 minutes, significantly improving installation efficiency.

[0015] The above description is an example of the field application of a sealing device for injection wells in a uranium mine for in-situ leaching. Any equivalent substitutions or obvious modifications made by using this device are within the scope of this description and should be protected by this invention.

Claims

1. A leaching well liquid injection well head sealing device, characterised in that: The sealing element (1) includes threads (2), a sealing ring (3), and a flange (4); the sealing ring (3) is inserted into the sealing ring groove of the sealing element (1), the threads (2) surround the sealing ring (3) and are located below the sealing ring (3); the flange (4) is located on top of the sealing element (1).

2. The in-situ leaching uranium mining liquid injection well wellhead sealing device according to claim 1, characterized in that: The thread type and spacing of the thread (2) are matched with the well pipe (7) of the injection well.

3. The in-situ leaching uranium mining liquid injection well wellhead sealing device according to claim 1, characterized in that: Place a sealing gasket (6) on top of the flange (4), align the flange (4) with the injection line (5), and tighten it with bolts.

4. The in-situ leaching uranium mining liquid injection well wellhead sealing device according to claim 1, characterized in that: The sealing element (1) is screwed into the injection well casing (7).

5. The in-situ leaching uranium mining liquid injection well wellhead sealing device according to claim 3, characterized in that: The sealing gasket (6) is a fluororubber sealing gasket.

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