Uranium mining leaching method for uranium mine underground stope

Abstract

The invention relates to the technical field of uranium mine mining, in particular to a uranium mine underground stope uranium mining leaching method which comprises the steps that S1, a target uranium ore body is confirmed; s2, liquid distribution roadways and liquid distribution pipes are constructed, the multiple liquid distribution roadways are formed between a top plate of the target uranium ore body and the uranium ore layer, the trend of the liquid distribution roadways is consistent with the trend of the target uranium ore body, the liquid distribution pipes are installed in the liquid distribution roadways, and multiple liquid distribution holes facing the uranium ore layer are formed in the liquid distribution pipes; s3, a liquid collection system is constructed, and a liquid collection pool is formed between a bottom plate of the target uranium ore body and the uranium ore layer; s4, automatic control is configured and used for monitoring and adjusting the flow and pressure of the leachate entering the liquid distribution pipes in real time; and a second automatic control pipeline is communicated between the liquid collecting tank and the sedimentation tank. The uranium mining leaching method is suitable for a uranium mine underground stope, uranium ore does not need to be carried, the effect that the leachate circularly enters the uranium ore layer is achieved till the uranium-containing ion concentration in the leachate reaches the qualified leachate standard, and the uranium recovery rate is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of uranium mining, in particular to a uranium leaching method in an underground uranium mine. Background Art

[0002] An underground uranium mine refers to the underground working space within a uranium mine used to extract uranium ore, and is the core area of ​​uranium mining. Currently, existing uranium extraction technologies primarily utilize in-situ leaching and heap leaching. In-situ leaching involves injecting a leachate into a uranium-bearing ore layer through an injection well. This leachate reacts chemically with the uranium ore, dissolving the uranium and forming a uranium-containing solution. This solution is then recovered through a pumping well and brought to the surface for processing. Heap leaching involves depositing crushed uranium ore in an impermeable stockpile and spraying it with a chemical solution to dissolve the uranium and transfer it into the solution, ultimately extracting the uranium.

[0003] Heap leaching is commonly used for uranium extraction in underground uranium mines, while in-situ leaching is generally unsuitable. This is because underground uranium mines already have existing structures such as tunnels and empty areas. Implementing in-situ leaching requires designing injection and extraction well patterns to avoid these obstacles, which can lead to a chaotic injection and extraction path, resulting in ineffective coverage of the target uranium ore body with the leachate. However, heap leaching also requires extensive uranium ore handling and crushing, which generates significant dust and pollutes the environment. Consequently, no suitable uranium leaching method currently exists for underground uranium mines that does not require uranium ore handling. Summary of the Invention

[0004] In view of the shortcomings of the prior art, one of the objects of the present invention is to provide a uranium leaching method for underground uranium mines, which is not only applicable to uranium mining in underground uranium mines, but also does not require the transportation of uranium ore.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for leaching uranium in an underground uranium mine, comprising the following steps:

[0007] S1. Confirm the target uranium ore body in the underground uranium mine. The target uranium ore body includes the roof, uranium ore layer and floor. The roof is the rock layer covering the uranium ore layer, and the floor is the rock layer covering the uranium ore layer.

[0008] S2, constructing liquid distribution lanes and liquid distribution pipes. In an underground uranium mine stope, multiple liquid distribution lanes are opened between the roof of the target uranium ore body and the uranium ore layer. The direction of the liquid distribution lanes is consistent with the direction of the target uranium ore body. Liquid distribution pipes are installed in the liquid distribution lanes, and the liquid distribution pipes are provided with multiple liquid distribution holes facing the uranium ore layer.

[0009] S3, constructing a liquid collection system. In an underground uranium mine stope, a liquid collection tank is set up below the uranium ore layer of the target uranium ore body to collect the uranium-containing leachate flowing out of the uranium ore layer.

[0010] S4, configure automatic control, equip the underground mining area of ​​the uranium mine with a liquid distribution tank and a sedimentation tank, and connect the liquid distribution tank with a first automatic control pipeline to monitor and adjust the flow rate and pressure of the leaching liquid entering each of the liquid distribution pipes in real time; connect the liquid collecting tank with a second automatic control pipeline to automatically control the connection and disconnection between the liquid collecting tank and the sedimentation tank; connect the liquid inlet end of the first automatic control pipeline to the liquid collecting tank with a third automatic control pipeline to adjust the flow rate of the solution in the liquid collecting tank entering the first automatic control pipeline in real time.

[0011] Beneficial effects of the present invention:

[0012] When the uranium leaching method of the present invention is used, the prepared leaching solution in the liquid distribution pool is pumped into each liquid distribution pipe through the first automatic control pipeline, and the leaching solution in each liquid distribution pipe is sprayed on the uranium ore layer of the uranium ore body through its own liquid distribution hole, so that the leaching solution penetrates the uranium ore layer. During the penetration process, the leaching solution reacts chemically with the uranium minerals inside the uranium ore layer, dissolving the uranium element and forming a uranium-containing leaching solution (uranium exists in the leaching solution in the form of ions). The uranium-containing leaching solution seeps out of the uranium ore layer into the liquid collecting pool; at this time, the second automatic control pipeline is closed, and the control collection is closed. The liquid pool is disconnected from the sedimentation tank; the first automatic control pipeline controls the liquid distribution pool to prevent liquid from discharging; the third automatic control pipeline is opened to input the leachate in the liquid collecting pool into the first automatic control pipeline, and finally the leachate is sprayed onto the uranium ore layer by the first automatic control pipeline until the uranium ion concentration in the leachate reaches the qualified leachate standard; when the uranium ion concentration in the leachate reaches the qualified leachate standard, the first and third automatic control pipelines are closed, and at this time the second automatic control pipeline is opened to input the leachate in the liquid collecting pool into the sedimentation tank for precipitation and extraction of uranium.

[0013] Furthermore, in step S2, one end of the liquid distribution lane is open and the other end is closed, the open end of the liquid distribution lane is for the liquid distribution pipe to be inserted into the liquid distribution lane, and the open end of the liquid distribution lane and the liquid distribution pipe are sealed.

[0014] Beneficial effect: preventing the leachate from leaking from the gap between the open end of the liquid distribution tunnel and the liquid distribution pipe.

[0015] Furthermore, in step S4, the connection position between the liquid collecting tank and the second automatic control pipeline is sealed.

[0016] Beneficial effect: preventing the leachate from leaking from the gap between the liquid collecting tank and the second automatic control pipeline.

[0017] Furthermore, the uranium leaching method for underground uranium mines of the present invention further includes step S5, in which the chemical composition of the leachate in the liquid collecting pool is regularly analyzed, and the leachate ratio is adjusted according to the analysis results.

[0018] Beneficial effect: Optimizes the uranium leaching process.

[0019] Furthermore, the plurality of liquid distribution holes on the liquid distribution pipe are evenly spaced along the axial direction of the liquid distribution pipe.

[0020] Beneficial effect: Improve the spraying uniformity of the leachate

[0021] Furthermore, in step S4, the leachate in the liquid collection tank is filtered through multiple stages before entering the sedimentation tank.

[0022] Beneficial effect: The treated leachate is recycled to improve resource utilization.

[0023] Furthermore, the pH value of the leachate in the liquid collection tank is regularly detected and adjusted to 2.0-2.5.

[0024] Beneficial effect: Prevents the solution from corroding the equipment due to low pH.

[0025] Furthermore, the first automatic control pipeline includes a first pipeline, a first power pump, a first automatic regulating valve, a second automatic regulating valve, a pressure sensor and a flow meter, and the liquid distribution tank and the liquid distribution pipe are sealed and connected through the first pipeline; starting from the liquid distribution tank, the first automatic regulating valve, the first power pump, the second automatic regulating valve, the pressure sensor and the flow meter are sequentially arranged on the first pipeline; the first automatic regulating valve is used to control the on-off between the first power pump and the liquid distribution tank; the second automatic regulating valve is used to control the flow of the leachate entering the liquid distribution pipe; the pressure sensor is used to monitor the pressure in the first pipeline in real time; the flow meter is used to monitor the flow of the leachate entering the liquid distribution pipe in real time.

[0026] Beneficial effects: Automatically adjust the flow rate of the leachate delivered to the liquid distribution hole to ensure the spraying intensity of the leachate and ensure the uniform spraying effect of the leachate.

[0027] Furthermore, the second automatic control pipeline includes a second pipeline, a second power pump and a third automatic regulating valve. The sedimentation tank and the liquid collection tank are sealed and connected through the second pipeline. The third automatic regulating valve and the second power pump are both arranged on the second pipeline. The third automatic regulating valve is used to control whether the leachate in the liquid collection tank can enter the sedimentation tank; the second power pump is used to pump the leachate in the liquid collection tank into the sedimentation tank.

[0028] Beneficial effect: It can automatically adjust whether the leachate in the liquid collection tank enters the sedimentation tank.

[0029] Furthermore, the third automatic control pipeline includes a third pipeline, a third power pump, a fourth automatic regulating valve and a fifth automatic regulating valve. The liquid outlet of the second automatic regulating valve is sealed and connected to the liquid collecting tank through the third pipeline. The fourth automatic regulating valve, the third power pump and the fifth automatic regulating valve are all arranged on the third pipeline, and the third power pump is located between the fourth automatic regulating valve and the fifth automatic regulating valve.

[0030] Beneficial effect: The leaching solution can be automatically circulated into the uranium ore layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a flow chart of the uranium leaching method for underground uranium mines of the present invention;

[0032] Figure 2 The schematic diagram of the uranium leaching method for underground uranium mines of the present invention is shown;

[0033] Figure 3 This is a schematic structural diagram of a uranium ore body according to an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the distribution structure of the liquid distribution pipes above the uranium ore layer involved in this embodiment;

[0035] Figure 5 This is a schematic structural diagram of the liquid distribution pipe involved in this embodiment.

[0036] 1. Uranium ore body; 10. Uranium ore layer; 11. Roof; 12. Floor; 13. Surrounding rock; 14. Liquid distribution tunnel; 2. Liquid distribution pipe; 20. Liquid distribution hole; 3. Liquid collecting tank; 4. Liquid distribution tank; 5. Sedimentation tank; 50. Connecting pipe; 51. Control valve; 60. First pipeline; 61. First power pump; 62. First automatic regulating valve; 63. Second automatic regulating valve; 64. Pressure sensor; 65. Flow meter; 66. Flow regulating valve; 70. Second pipeline; 71. Second power pump; 72. Third automatic regulating valve; 80. Third pipeline; 81. Third power pump; 82. Fourth automatic regulating valve; 83. Fifth automatic regulating valve. DETAILED DESCRIPTION

[0037] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] In the description of the present invention, it should be understood that the terms "width", "up", "down", "front", "back", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0039] In the present invention, unless otherwise clearly stipulated and limited, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature between them.

[0040] Please refer to Figure 1 - Figure 5 The present invention provides a method for uranium leaching in an underground uranium mine, comprising the following steps: step S1, step S2, step S3, step 4 and step S5.

[0041] Step S1: Identify a target uranium ore body 1 in an underground uranium mine stope. An underground uranium mine stope refers to the working space excavated for ore recovery during underground uranium mining, and is the core area where mining activities are directly carried out. The target uranium ore body 1 refers to the uranium ore body 1 from which uranium is to be extracted. The target uranium ore body 1 comprises a roof 11, a uranium ore layer 10, and a floor 12. The roof 11 is the rock layer covering the uranium ore layer 10. It serves as an aquiclude above the uranium ore layer 10, protecting the ore body from oxidation. The floor 12 is the rock layer covering the uranium ore layer 10. It serves as an aquiclude below the uranium ore layer 10. The floor 12 (e.g., shale) acts as a seal, preventing the loss of ore fluid and the downward seepage of groundwater in the ore-bearing aquifer, thereby maintaining the water-rich nature of the ore deposit. The surrounding rock 13 of the uranium ore layer 10 is aquiclude with an extremely low permeability (e.g., mudstone or shale), which effectively blocks groundwater flow.

[0042] Step S2: constructing a liquid distribution tunnel 14 and a liquid distribution pipe 2; operating in an underground uranium mine stope, opening a plurality of liquid distribution tunnels 14 between the roof 11 of the target uranium ore body 1 and the uranium ore layer 10; the direction of the liquid distribution tunnel 14 is consistent with the direction of the target uranium ore body 1, installing a liquid distribution pipe 2 in the liquid distribution tunnel 14, and providing a plurality of liquid distribution holes 20 on the liquid distribution pipe 2 facing the uranium ore layer 10.

[0043] Of course, before opening the liquid distribution tunnel 14, it is necessary to conduct detailed geological exploration to determine the position, shape, scale and lithological characteristics of the roof 11 and floor 12 of the uranium ore body 1; and use existing geological radar, seismic exploration and other technical means to accurately calibrate the boundary of the uranium ore body 1 and the contact surface between its roof 11 and the uranium ore layer 10.

[0044] The rock properties of the roof 11 are crucial to the stability of the liquid distribution tunnel 14. If the roof 11 is a broken or weak rock formation, enhanced support is required to prevent tunnel collapse. Based on the rock properties of the roof 11, appropriate support methods (such as anchor support and steel frame support) are selected to ensure the stability of the liquid distribution tunnel 14. These anchor support and steel frame support methods also utilize existing technical support methods and will not be explained here.

[0045] In this embodiment, a drilling and blasting method or mechanized excavation method can be used to excavate a liquid distribution tunnel 14 between the roof 11 and the uranium ore layer 10. During excavation, changes in the roof 11 must be closely monitored, and reinforcement measures must be implemented promptly. Once the liquid distribution tunnel 14 is completed, the liquid distribution pipe 2 is inserted into the tunnel 14. Leachate is ejected from the multiple liquid distribution holes 20 on the liquid distribution pipe 2 and penetrates into the uranium ore layer 10, dissolving the uranium within the uranium ore layer 10.

[0046] Of course, in step S2, one end of the liquid distribution tunnel 14 is an open structure and the other end is a closed structure. The open end of the liquid distribution tunnel 14 is for the liquid distribution pipe 2 to be inserted into the liquid distribution tunnel 14, and the open end of the liquid distribution tunnel 14 and the liquid distribution pipe 2 are sealed. This can prevent the leachate from overflowing from the connection between the liquid distribution tunnel 14 and the liquid distribution pipe 2, ensure that the leachate is completely injected into the uranium ore layer 10, reduce the waste of leachate, and improve the uranium resource recovery rate.

[0047] The target uranium ore body 1 of this embodiment is generally inclined at an angle of 50 to 60° (e.g. Figure 3 As shown in FIG5 , the liquid distribution tunnel 14 is arranged along the strike of the target uranium ore body 1. Since each liquid distribution pipe 2 is inserted into each liquid distribution tunnel 14 along the strike of each liquid distribution tunnel 14, and the multiple liquid distribution holes 20 on each liquid distribution pipe 2 are evenly spaced along the axial direction of each liquid distribution pipe 2, the leaching solution can evenly penetrate the uranium ore layer 10 along the extension direction of the uranium ore body 1, avoiding local over-leaching or under-leaching that affects the uranium resource recovery rate.

[0048] It should be noted that the number of liquid distribution lanes 14 and liquid distribution pipes 2 can be reasonably arranged according to actual conditions to ensure uniform penetration of the leachate and avoid local over- or under-immersion.

[0049] Step S3: Constructing a liquid collection system; in the underground mining area of ​​the uranium mine, a liquid collection tank 3 is set below the uranium ore layer 10 of the target uranium ore body 1. The liquid collection tank 3 is used to collect the leachate containing uranium flowing out of the uranium ore layer 10. The liquid collection tank 3 is set between the uranium ore layer 10 and the bottom plate 12 of the target uranium ore body 1. Of course, when opening the liquid collection tank 3, it is necessary to ensure that the bottom plate 12 has sufficient water-proof properties to avoid groundwater pollution caused by the construction of the liquid collection tank 3. When the leachate penetrates into the uranium ore layer 10 from the liquid distribution hole 20 and dissolves the uranium in the uranium ore layer 10, the uranium exists in the leachate in the form of ions. These leachates containing uranium will enter the liquid collection tank 3 through the permeability of the uranium ore layer 10. The liquid collection tank 3 of this embodiment can be opened between the uranium ore layer 10 and the bottom plate 12 of the uranium ore body 1 by mechanical excavation.

[0050] In other embodiments, the liquid collecting pool 3 may also be disposed below the bottom plate 12 of the uranium ore body 1 , and the liquid collecting pool 3 may be connected to the uranium ore layer 10 through a pipeline, so that the uranium-containing leachate can enter the liquid collecting pool 3 for collection.

[0051] Step S4: configure automatic control; equip the underground mining area of ​​the uranium mine with a liquid distribution tank 4 and a sedimentation tank 5, and a first automatic control pipeline is connected between the liquid distribution tank 4 and each liquid distribution pipe 2, and the first automatic control pipeline is used to monitor and adjust the flow rate and pressure of the leachate entering each of the liquid distribution pipes 2 in real time; a second automatic control pipeline is connected between the liquid collecting tank 3 and the sedimentation tank 5, and the second automatic control pipeline is used to automatically control the connection and disconnection between the liquid collecting tank 3 and the sedimentation tank 5; a third automatic control pipeline is connected between the liquid inlet end of the first automatic control pipeline and the liquid collecting tank 3, and the third automatic control pipeline is used to adjust the flow rate of the solution in the liquid collecting tank 3 entering the first automatic control pipeline in real time.

[0052] In step S4, it can be specifically understood that after the leachate is first configured in the liquid distribution pool 4 and transported to the liquid distribution hole 20, the leachate collected in the liquid collection pool 3 is subsequently injected into the liquid distribution hole 20 for spraying until the uranium ion concentration in the leachate reaches the qualified leachate standard. In the process of the leachate entering the liquid distribution hole 20, the flow rate and pressure of the leachate entering each of the liquid distribution pipes 2 are monitored and adjusted in real time by the first automatic control pipeline, which can ensure that the leachate is evenly distributed in the liquid distribution hole 20, avoid local excess or deficiency, and thus improve the leaching efficiency of the uranium ore; at the same time, reduce the risk of leachate leakage caused by abnormal flow or pressure. In addition, the geological conditions of different mining areas vary greatly. By real-time monitoring and adjusting the flow rate and pressure of the leachate entering the liquid distribution hole 20, the production process can be made more flexible and adaptable to different ore characteristics and leaching requirements.

[0053] Of course, in step S4, the first automatic control pipeline, the second automatic control pipeline and the third automatic control pipeline are all controlled by the control system, and the control system uses the existing PLC control system.

[0054] Of course, the connection position between the liquid collecting tank 3 and the second automatic control pipeline is sealed, so that the leaching liquid can be prevented from overflowing from the connection position between the liquid collecting tank 3 and the second automatic control pipeline, thereby improving the uranium resource recovery rate.

[0055] In step S4, the first automatic control pipeline includes a first pipeline 60, a first power pump 61, a first automatic regulating valve 62, a second automatic regulating valve 63, a pressure sensor 64, and a flowmeter 65. The first power pump 61, the first automatic regulating valve 62, the second automatic regulating valve 63, the pressure sensor 64, and the flowmeter 65 are all controlled by the control system. The first pipeline 60 provides a sealed connection between the liquid distribution tank 4 and each liquid distribution pipe 2. Starting from the liquid distribution tank 4, the first automatic regulating valve 62, the first power pump 61, the second automatic regulating valve 63, the pressure sensor 64, and the flowmeter 65 are sequentially arranged on the first pipeline 60. The first automatic regulating valve 62 is primarily used to control the connection between the first power pump 61 and the liquid distribution tank 4; the second automatic regulating valve 63 is primarily used to control the flow rate of the leachate entering the liquid distribution pipe 2; the pressure sensor 64 is primarily used to monitor the pressure within the first pipeline 60 in real time; and the flowmeter 65 is primarily used to monitor the flow rate of the leachate entering the liquid distribution pipe 2 in real time. It can be seen that a flow meter 65, a pressure sensor 64 and an automatic regulating valve are installed on the first pipeline 60, which can monitor and adjust the flow rate and pressure of the leachate entering the liquid distribution hole 20 in real time; the power for the leachate to enter the liquid distribution hole 20 comes from the first power pump 61. The power of the first power pump 61 should be selected according to the actual scale of the mining site to ensure that the flow rate of the leachate delivered to the liquid distribution hole 20 is sufficient, and the control system can adjust the pumping flow rate according to the feedback of the flow meter 65 to ensure the spraying intensity and uniformity of the leachate.

[0056] There are multiple flow meters 65, each corresponding to a plurality of liquid distribution pipes 2. That is, each flow meter 65 is used to detect the flow rate of leachate entering each liquid distribution pipe 2. In addition, a flow control valve 66 controlled by the control system is provided between each flow meter 65 and each liquid distribution pipe 2. Each flow control valve 66 is used to adjust the flow rate of leachate entering each liquid distribution pipe 2.

[0057] In step S4, the second automatic control pipeline includes a second pipeline 70, a second power pump 71 and a third automatic regulating valve 72. The sedimentation tank 5 and the liquid collecting tank 3 are sealed and connected through the second pipeline 70. The third automatic regulating valve 72 and the second power pump 71 are both arranged on the second pipeline 70. The third automatic regulating valve 72 and the second power pump 71 are both controlled by the control system. The third automatic regulating valve 72 is mainly used to control whether the leachate in the liquid collecting tank 3 can enter the sedimentation tank 5; the second power pump 71 is mainly used to pump the leachate in the liquid collecting tank 3 into the sedimentation tank 5.

[0058] In step S4, the third automatic control pipeline includes a third pipeline 80, a third power pump 81, a fourth automatic regulating valve 82 and a fifth automatic regulating valve 83. The third power pump 81, the fourth automatic regulating valve 82 and the fifth automatic regulating valve 83 are all controlled by the control system. The liquid outlet of the second automatic regulating valve 63 is sealed and connected to the liquid collecting pool 3 through the third pipeline 80. The fourth automatic regulating valve 82, the third power pump 81 and the fifth automatic regulating valve 83 are all arranged on the third pipeline 80, and the third power pump 81 is located between the fourth automatic regulating valve 82 and the fifth automatic regulating valve 83.

[0059] From the above, it can be understood that before the uranium ion concentration in the leachate reaches the qualified leachate standard, the second automatic control pipeline is closed; that is, the second power pump 71 and the third automatic regulating valve 72 are closed. After the leachate is initially prepared in the liquid distribution tank 4 and transported to the liquid distribution hole 20 via the first automatic control pipeline, the first automatic regulating valve 62, the second automatic regulating valve 63, and the first power pump 61 in the first automatic control pipeline are closed, and the third power pump 81, the fourth automatic regulating valve 82, and the fifth automatic regulating valve 83 are opened. The leachate collected in the liquid collection tank 3 is pumped into the third pipeline 80 via the third power pump 81 and then injected from the first pipeline 60 into the liquid distribution hole 20 for spraying. This cycle continues until the uranium ion concentration in the leachate reaches the qualified leachate standard.

[0060] When the uranium ion concentration in the leachate reaches the qualified leachate standard, the first power pump 61, the first automatic regulating valve 62, the second automatic regulating valve 63, the pressure sensor 64 and the flow meter 65 are closed, the third power pump 81, the fourth automatic regulating valve 82 and the fifth automatic regulating valve 83 are closed, the second power pump 71 and the second automatic control pipeline are opened, and the second power pump 71 pumps the leachate in the liquid collecting tank 3 into the sedimentation tank 5 for precipitation and extraction of uranium.

[0061] It should be noted that the leachate in this embodiment is an acidic solution. The concentration and acidity of the leachate are adjusted as follows: In the initial leaching phase, an acidic solution is used to leach the uranium ore. As the uranium in the ore gradually dissolves, the acidity is gradually adjusted as needed to maintain the solution acidity between 10 and 15 g / L, ensuring a stable leaching process. Furthermore, the pH of the leachate in the sump 3 is regularly monitored and adjusted to a range of 2.0 to 2.5 to ensure effective leaching and prevent corrosion to the equipment caused by a low pH.

[0062] In step S4, after the uranium ion concentration in the leachate reaches the qualified leachate standard, the leachate in the collection tank 3 is filtered through multiple stages before entering the sedimentation tank 5. Since the leachate typically contains a large amount of impurities, such as mud, rock fragments, and other metal ions, these impurities occupy space in the sedimentation tank 5, competing with the uranium ions for precipitation sites, and reducing the uranium precipitation efficiency. Multi-stage filtration can effectively remove these impurities, allowing the uranium ions to precipitate more fully in the sedimentation tank 5, thereby improving the uranium extraction rate. Furthermore, multi-stage filtration can significantly reduce the impurity content in the leachate, resulting in a higher purity of the final extracted uranium product. High-purity uranium products have better performance and stability during subsequent processing and utilization, and can meet the quality requirements of uranium products in various fields.

[0063] Furthermore, in step S4, the sedimentation tank 5 is also connected to the liquid distribution tank 4 via a connecting pipe 50. A control valve 51 controlled by a control system is provided on the connecting pipe 50. The control valve 51 is primarily used to control whether the solution in the sedimentation tank 5 can enter the liquid distribution tank 4. It can be understood that after obtaining uranium-containing precipitates in the sedimentation tank 5, the supernatant in the sedimentation tank 5 is input into the liquid distribution tank 4, and the pH value of the supernatant is adjusted before returning it to the spraying station. In this way, the treated leachate can be recycled, thereby improving resource utilization and reducing environmental pollution.

[0064] Step S5: Regularly analyze the chemical composition of the leachate in the liquid collection tank 3, and adjust the leachate ratio based on the analysis results to optimize the leaching process. It can be seen that by dynamically adjusting the chemical composition of the leachate, the uranium leaching efficiency and uranium recovery rate can be maximized.

[0065] It should be noted that this embodiment uses existing technology to analyze the chemical composition of the leachate, which will not be explained here.

[0066] In summary, the uranium leaching method of the present invention can be applied to underground uranium mines without the need to transport uranium ore, and is suitable for uranium mining in small-scale uranium ore bodies 1 or experimental uranium ore bodies 1.

[0067] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for uranium leaching in an underground uranium mine, characterized in that: The steps include: S1. Confirm the target uranium ore body in the underground uranium mine. The target uranium ore body includes the roof, uranium ore layer and floor. The roof is the rock layer covering the uranium ore layer, and the floor is the rock layer covering the uranium ore layer. S2, constructing liquid distribution lanes and liquid distribution pipes. In an underground uranium mine stope, multiple liquid distribution lanes are opened between the roof of the target uranium ore body and the uranium ore layer. The direction of the liquid distribution lanes is consistent with the direction of the target uranium ore body. Liquid distribution pipes are installed in the liquid distribution lanes, and the liquid distribution pipes are provided with multiple liquid distribution holes facing the uranium ore layer. S3, constructing a liquid collection system. In an underground uranium mine stope, a liquid collection tank is set up below the uranium ore layer of the target uranium ore body to collect the uranium-containing leachate flowing out of the uranium ore layer. S4, configure automatic control, equip the underground mining area of ​​the uranium mine with a liquid distribution tank and a sedimentation tank, and connect the liquid distribution tank with a first automatic control pipeline to monitor and adjust the flow rate and pressure of the leaching liquid entering each of the liquid distribution pipes in real time; connect the liquid collecting tank with a second automatic control pipeline to automatically control the connection and disconnection between the liquid collecting tank and the sedimentation tank; connect the liquid inlet end of the first automatic control pipeline to the liquid collecting tank with a third automatic control pipeline to adjust the flow rate of the solution in the liquid collecting tank entering the first automatic control pipeline in real time.

2. The method for uranium leaching in an underground uranium mine according to claim 1, characterized in that: In step S2, one end of the liquid distribution lane is open and the other end is closed, the open end of the liquid distribution lane is for the liquid distribution pipe to be inserted into the liquid distribution lane, and the open end of the liquid distribution lane and the liquid distribution pipe are sealed.

3. The method for uranium leaching in an underground uranium mine according to claim 1, wherein: In step S4, the connection position between the second automatic control pipeline and the liquid collecting tank is sealed.

4. The method for uranium leaching in an underground uranium mine according to claim 1, wherein: The method further includes step S5, in which the chemical composition of the leachate in the liquid collecting pool is regularly analyzed, and the ratio of the leachate is adjusted according to the analysis results.

5. The method for uranium leaching in an underground uranium mine according to claim 1, characterized in that: The plurality of liquid distribution holes on the liquid distribution pipe are evenly spaced along the axial direction of the liquid distribution pipe.

6. The method for uranium leaching in an underground uranium mine according to claim 1, wherein: In step S4, the leachate in the liquid collection tank is filtered through multiple stages and then enters the sedimentation tank.

7. The method for uranium leaching in an underground uranium mine according to claim 1, characterized in that: The pH value of the leachate in the liquid collection tank is regularly detected and adjusted to 2.0-2.

5.

8. A uranium leaching method for underground uranium mines according to claim 1 or 6, characterized in that: The first automatic control pipeline includes a first pipeline, a first power pump, a first automatic regulating valve, a second automatic regulating valve, a pressure sensor and a flow meter. The liquid distribution tank and the liquid distribution pipe are sealed and connected through the first pipeline; starting from the liquid distribution tank, the first automatic regulating valve, the first power pump, the second automatic regulating valve, the pressure sensor and the flow meter are sequentially arranged on the first pipeline; the first automatic regulating valve is used to control the on-off between the first power pump and the liquid distribution tank; the second automatic regulating valve is used to control the flow of the leachate entering the liquid distribution pipe; the pressure sensor is used to monitor the pressure in the first pipeline in real time; the flow meter is used to monitor the flow of the leachate entering the liquid distribution pipe in real time.

9. The method for uranium leaching in an underground uranium mine according to claim 8, characterized in that: The second automatic control pipeline includes a second pipeline, a second power pump and a third automatic regulating valve. The sedimentation tank and the liquid collection tank are sealed and connected through the second pipeline. The third automatic regulating valve and the second power pump are both arranged on the second pipeline. The third automatic regulating valve is used to control whether the leachate in the liquid collection tank can enter the sedimentation tank; the second power pump is used to pump the leachate in the liquid collection tank into the sedimentation tank.

10. The method for uranium leaching in an underground uranium mine according to claim 8, characterized in that: The third automatic control pipeline includes a third pipeline, a third power pump, a fourth automatic regulating valve and a fifth automatic regulating valve. The liquid outlet of the second automatic regulating valve is sealed and connected to the liquid collecting tank through the third pipeline. The fourth automatic regulating valve, the third power pump and the fifth automatic regulating valve are all arranged on the third pipeline, and the third power pump is located between the fourth automatic regulating valve and the fifth automatic regulating valve.

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