A gas-liquid mixing enhancement system and method for in-situ leaching of uranium

Abstract

The present invention relates to the technical field of in-situ leaching of uranium, and in particular to a gas-liquid mixing enhancement system and method for in-situ leaching of uranium. The system comprises: a gas-liquid countercurrent stirring mixer with an upper cylinder and lower cone structure, a circular fluid distribution plate being provided at the junction of the cylinder and cone; the upper end of the side wall of the cylinder is connected to a CO2 inlet pipe, and the CO2 inlet pipe is connected to a liquid inlet pipe in a vertical direction; the end of the internal pipeline of the cylinder is connected to a liquid distributor; the side wall of the cone is connected to an O2 inlet pipe, and the bottom is connected to a base; a stirring device is installed on the side of the cylinder, and the lower end of the side wall is connected in sequence to a fluid outlet pipe, a static mixer and a well site injection drilling pipeline; the static mixer comprises a spiral plate that twists a rectangular plate 180° to the left and a spiral plate that twists a rectangular plate 180° to the right, and the two plates are arranged in sequence at 90° to each other. The method is carried out using the gas-liquid mixing enhancement system. The present invention has a compact structure, is easy to manufacture, and has a high dissolved oxygen rate.

Description

Technical Field

[0001] The present invention relates to the technical field of in-situ leaching of uranium, and in particular to a gas-liquid mixing intensification system and method for in-situ leaching of uranium. Background Art

[0002] In-situ uranium leaching is a uranium mining and smelting process that uses chemical solutions to selectively extract and recover uranium metal from sandstone uranium ore bodies that are naturally buried and have certain permeability through drilling. This process requires that a prepared leaching agent be injected into the ground, seeping along the ore layer to leach out the uranium in the ore, forming a leachate that is lifted to the surface and then separated and recovered through hydrometallurgical treatment. Different leaching agents are selected according to different processes, and in-situ uranium leaching can be divided into three types: acid method, alkaline method and neutral leaching. Among them, neutral leaching is to dissolve CO2 and O2 in water as a leaching agent. CO2 acts to acidify the formation and generate HCO3 - The role of O2 is to oxidize tetravalent uranium to form HCO3 - The neutral leaching process is simple, low-cost, and has a mild leaching environment. It also reduces the difficulty of post-decommissioning treatment of the mine.

[0003] However, due to the poor solubility of oxygen in water, the rate and amount of oxygen solubility in neutral leaching has always been a research challenge in this field. In fact, under standard conditions, the solubility of oxygen in water is only 8.25 mg / L. When using CO2+O2 technology for uranium in situ leaching, uranium mines typically control the oxygen injection rate to 200-400 mg / L to ensure high dissolved oxygen levels, and the demand for oxygen is also very high. However, as mentioned above, achieving rapid and high-volume oxygen dissolution is an unwavering goal of the industry, especially in the context of high-flow injection in horizontal and branch wells. The accompanying high-flow oxygen injection inevitably leads to gas blockage caused by the poor solubility of oxygen. This leads to reduced injection flow in the borehole, poor leaching results, and low uranium concentration in the leached uranium, which in turn restricts the application of CO2+O2 in situ leaching of uranium.

[0004] Although several gas-liquid mixing devices are currently available on the market, such as static mixers, gas-liquid mixing pumps, and Venturi mixers, each of which enhances the gas-liquid mass transfer area and increases dissolved oxygen content through various means, the oxygen dissolution effect is limited. Furthermore, some devices are bulky and complex to operate. Some domestic uranium mines use static mixers installed in each injection branch pipe, which imposes new requirements on installation space and the number of mixers, resulting in poor economic efficiency. Therefore, a new, efficient dissolved oxygen system and method is urgently needed to achieve breakthroughs in the key technologies for efficient oxygen dissolution in in-situ leaching solutions. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a gas-liquid mixing intensification system and method for in-situ leaching of uranium, which is convenient to manufacture, simple to operate and has high oxygen dissolving efficiency.

[0006] The present invention provides a gas-liquid mixing intensification system for in-situ leaching of uranium, comprising: a gas-liquid countercurrent stirring mixer and a static mixer;

[0007] The gas-liquid countercurrent stirring mixer has an upper cylinder and lower cone structure, with a circular fluid distribution plate provided at the junction of the cylinder and cone. The upper end of the cylinder side wall is connected to a CO2 inlet pipe, which directly enters the internal pipeline of the cylinder. The CO2 inlet pipe is connected to the liquid inlet pipe in a vertical direction. The end of the internal pipeline of the cylinder is bent 90 degrees and connected to the liquid distributor.

[0008] The side wall of the vertebral body is connected to an O2 inlet tube; the bottom of the vertebral body is connected to the base;

[0009] A stirring device is installed on the side of the cylinder, and the stirring device consists of a motor, a rotating shaft and blades; the end of the stirring shaft is connected to the blades and is located inside the cylinder;

[0010] The lower end of the side wall of the cylinder is connected in sequence to the fluid outlet pipe, the static mixer and the well site injection drilling pipeline;

[0011] The static mixer is a pipe with internal components. The pipe contains two types of units. One unit is a spiral plate formed by twisting a rectangular plate 180 degrees to the left, and the other unit is a spiral plate formed by twisting a rectangular plate 180 degrees to the right. The two units are arranged in sequence at 90 degrees to fill the entire interior of the static mixer.

[0012] A valve is provided between the fluid outlet pipe and the static mixer.

[0013] Preferably, the height-to-diameter ratio of the cylinder is 1.5-3.0, the height ratio of the cylinder to the cone is 1.5-2.5, and the material is 304 or 316L stainless steel.

[0014] Preferably, the liquid distributor comprises a cavity, a pipeline extends outward from the bottom of the cavity, and an even number of pipelines of the same length are evenly arranged around the cavity and are consistent with the length of the pipeline at the bottom of the cavity.

[0015] Preferably, the circular fluid distribution plate is a porous structure, and a plurality of circular channels are evenly opened on the circular plate, and the channel diameter is 2 to 15 mm.

[0016] Preferably, the CO2 inlet pipe, O2 inlet pipe and liquid inlet pipe all adopt tapered circular inlets, and the tapering ratio is 0.4 to 0.75; the CO2 inlet pipe enters horizontally, and the liquid inlet pipe enters vertically, and the two enter the cylinder space after merging; the O2 inlet pipe enters horizontally.

[0017] Preferably, the valve is a common ball valve or a gate valve.

[0018] Preferably, the cylinder is further provided with a visual window for observing the liquid level inside the cylinder.

[0019] Preferably, the length of the blade in the horizontal state is smaller than the diameter of the cylinder, and the blade is lower than the bottom end of the viewing window when it is kept in the vertical state;

[0020] The blades are located at least at the axial center of the cylinder or toward the right half of the cylinder close to the fluid outlet pipe; the number of blades is even and at least 2.

[0021] Preferably, the fluid outlet pipe is a gradually expanding circular outlet pipe, and the pipe axis is coaxial with or lower than the rotation axis of the stirring device.

[0022] Preferably, the static mixer has a length of 1 to 1.5 m, an aspect ratio of 20 to 40, and is made of 304 or 316L stainless steel.

[0023] The present invention also provides a gas-liquid mixing intensification method for in-situ leaching of uranium, which uses the gas-liquid mixing intensification system described in the above technical solution to perform the following steps:

[0024] (1) Connect the CO2 inlet pipe, O2 inlet pipe, liquid inlet pipe and fluid outlet pipe;

[0025] (2) Close the outlet valve of the gas-liquid countercurrent stirring mixer, open the stirrer, and introduce the fluid;

[0026] (3) When the liquid level in the container reaches a threshold height, the outlet valve is opened;

[0027] (4) The fluid is passed through the fluid outlet of the gas-liquid countercurrent stirring mixer to the static mixer, and then the dissolved oxygen content is measured at the static mixer outlet. The fluid then flows through the pipeline to the injection borehole at the well site.

[0028] Preferably, the liquid level in the container is observed by observing the visual window, and the outlet valve is opened when the liquid level in the container reaches a threshold height.

[0029] Compared with the prior art, the gas-liquid mixing intensification system and method for in-situ leaching of uranium of the present invention has the following beneficial effects:

[0030] (1) According to the gas-liquid density difference effect, gas-liquid countercurrent can increase the gas-liquid contact area to a greater extent; on this basis, the presence of the top liquid distributor can divert the liquid containing CO2, and the setting of the middle porous plate can divert O2 and gas-liquid two-phase flow, which further enhances the gas-liquid mass transfer area.

[0031] (2) The installation of an agitator in the device can cause forced convection and eddy currents in the fluid, increase the turbulence effect inside the equipment, and increase molecular diffusion; at the same time, the rotating blades can cut large bubbles into small bubbles, thereby increasing the gas-liquid contact area.

[0032] (3) The static mixing device can disperse and cut the fluid. Due to the changes in the shape and cross-sectional area of ​​the internal flow channel, it also plays a role of "self-stirring". It is connected to the outlet of the new gas-liquid countercurrent stirring mixer, so that the leaching liquid undergoes a certain distance of enhanced mixing before entering the formation, which can effectively increase the amount of O2 dissolved.

[0033] (4) The fluid inlet and outlet of the gas-liquid mixing system adopt a gradient shape, which utilizes the "Venturi" effect and can increase the collision and mixing of fluids through changes in pressure and speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram showing the structure of a gas-liquid mixing enhancement system for in-situ leaching of uranium;

[0035] In the figure,

[0036] 1-gas-liquid countercurrent stirring mixer, 2-liquid inlet pipe, 3-CO2 inlet pipe, 4-liquid distributor, 5-visual window, 6-liquid level, 7-motor, 8-rotating shaft, 9-blade, 10-fluid outlet pipe, 11-fluid distribution plate, 12-O2 inlet pipe, 13-base, 14-valve, 15-static mixer, 16-pipeline for connecting to the well site injection drilling hole. DETAILED DESCRIPTION

[0037] In order to further understand the present invention, embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than for limiting the present invention.

[0038] In this case, the taper ratio is the diameter after taper / the diameter after taper.

[0039] The embodiment of the present invention discloses a gas-liquid mixing intensification system for in-situ leaching of uranium, such as Figure 1 As shown, it includes: a gas-liquid countercurrent stirring mixer 1 and a static mixer 15;

[0040] The gas-liquid countercurrent stirring mixer 1 is an upper cylinder and lower cone structure, and a circular fluid distribution plate 11 is provided at the junction of the cylinder and cone;

[0041] The cylinder and the cone are welded into an integral structure, and the cone gradually shrinks downward; the height-to-diameter ratio of the cylinder is preferably 1.5-3.0, and the height ratio of the cylinder to the cone is preferably 1.5-2.5. The material is 304 or 316L stainless steel.

[0042] The circular fluid distribution plate is preferably a porous structure, with a plurality of circular channels evenly arranged on the circular plate, and the channel diameter is preferably 2 to 15 mm.

[0043] The upper end of the side wall of the cylinder is connected to a CO2 inlet pipe 3, which directly leads to the internal pipeline of the cylinder. The vertical direction of the CO2 inlet pipe 3 is connected to the liquid inlet pipe 2;

[0044] The CO2 inlet pipe, O2 inlet pipe and liquid inlet pipe preferably all adopt tapered circular inlets, which can increase the collision and mixing of the fluids by changing the pressure and speed, and the tapering ratio is 0.4 to 0.75; the CO2 inlet pipe 3 enters horizontally, and the liquid inlet pipe 2 enters vertically, and the two enter the cylinder space after merging;

[0045] The end of the tubing inside the cylinder is connected to the liquid distributor 4 after a 90° bend. After the CO2 and liquid merge, it dissolves in the liquid and enters the tubing inside the cylinder. After a 90° bend, it flows vertically downward, then passes through the liquid distributor 4, transforming from a single stream into multiple streams and entering the cylinder. The specific structure of the liquid distributor 4 is preferably: it includes a cavity, a tube extending from the bottom of the cavity, and an even number of tubes of uniform length evenly arranged around the cavity, and the same length as the tube at the bottom of the cavity.

[0046] The side wall of the vertebral body is connected to an O2 inlet pipe 12; the bottom of the vertebral body is connected to a base 13; and the O2 inlet pipe is in a horizontal entry manner.

[0047] A stirring device is installed on the side of the cylinder, and the stirring device consists of a motor 7, a rotating shaft 8 and a blade 9; the end of the stirring shaft 8 is connected to the blade 9 and is located inside the cylinder;

[0048] In order to facilitate observation of the liquid level 6 inside the cylinder, the cylinder is further provided with a visual window 5 .

[0049] The length of the blade 9 in the horizontal state is smaller than the diameter of the cylinder, and the blade is lower than the bottom end of the viewing window when it is kept in the vertical state;

[0050] The blades are located at least at the axial center of the cylinder or toward the right half of the cylinder close to the fluid outlet pipe; the number of blades is even and at least 2.

[0051] The lower end of the side wall of the cylinder is connected in sequence to the fluid outlet pipe 10, the static mixer 15 and the well site injection drilling pipeline 16; the fluid outlet pipe is preferably a gradually expanding circular outlet pipe, and its pipeline axis is coaxial with or lower than the rotation axis of the stirring device.

[0052] The static mixer 15 is a pipe with internal components, which contains two types of units. One unit is a spiral plate formed by twisting a rectangular plate 180° to the left, and the other unit is a spiral plate formed by twisting a rectangular plate 180° to the right. The two units are arranged in sequence at 90° to each other and filled in the entire static mixer. The length of the static mixer is preferably 1 to 1.5 m, the aspect ratio is preferably 20 to 40, and the material is 304 or 316L stainless steel.

[0053] A valve is provided between the fluid outlet pipe 10 and the static mixer 15 .

[0054] The valve can be selected as a common ball valve or a gate valve.

[0055] The embodiment of the present invention further discloses a gas-liquid mixing enhancement method for in-situ leaching of uranium, which uses the gas-liquid mixing enhancement system described in the above technical solution to perform the following steps:

[0056] (1) Connect the CO2 inlet pipe, O2 inlet pipe, liquid inlet pipe and fluid outlet pipe;

[0057] (2) Close the outlet valve of the gas-liquid countercurrent stirring mixer, open the stirrer, and introduce the fluid;

[0058] (3) When the liquid level in the container reaches a threshold height, the outlet valve is opened;

[0059] (4) The fluid is passed through the fluid outlet of the gas-liquid countercurrent stirring mixer to the static mixer, and then the dissolved oxygen content is measured at the static mixer outlet. The fluid then flows through the pipeline to the injection borehole at the well site.

[0060] While the method is being performed, the system remains in continuous operation without interruption.

[0061] Observe the liquid level in the container by looking through the visual window, and when the liquid level in the container reaches the threshold height, open the outlet valve.

[0062] The gas-liquid mixing enhancement system and method for in-situ uranium leaching of the present invention operates as follows: CO2 is introduced horizontally through a tapered CO2 inlet pipe, and liquid is vertically mixed with the CO2 flow through a tapered liquid inlet pipe. The two streams flow together toward a liquid distributor 4 and into a gas-liquid countercurrent stirring mixer 1, flowing axially downward along the cylinder. O2 then enters the gas-liquid countercurrent stirring mixer 1 horizontally through a tapered O2 inlet pipe 12 and flows axially upward along the cone. Under the action of the stirring device, the fluid rotates and is stirred. When the liquid level is visible through a viewing window 5, indicating that the fluid has achieved preliminary mixing due to the countercurrent and stirring effects, valve 14 located at the gas-liquid fluid outlet pipe 10 is opened. The opening of valve 14 can be measured based on the liquid level within the gas-liquid countercurrent stirring mixer, with the required liquid level range being the height range of the viewing window 5. The fluid flowing out of the gas-liquid countercurrent stirring mixer 1 is then finally mixed in the static mixer 15 and finally flows to the injection drilling pipeline 16 connected to the well site, thereby achieving the purpose of gas-liquid enhanced mixing for CO2+O2 in-situ leaching of uranium.

[0063] In fact, for the gas-liquid countercurrent mixer 1, the lower half of the cylinder and the entire cone, that is, below the viewing window 5, are the initial gas-liquid mixing zone. This zone has three functions: first, the positions of the liquid inlet pipe 2, CO2 inlet pipe 3, and O2 inlet pipe 12, which are set according to the gas-liquid density difference, naturally achieve a countercurrent state; second, the liquid distributor 4 and fluid distribution plate 11 can disperse the fluid, thereby increasing the gas-liquid contact area; third, the stirring device breaks the pure countercurrent state of the fluid, increases the rotation effect, and acts to cut large bubbles, resulting in sufficient fluid contact. After flowing out of the gas-liquid countercurrent mixer 1, the fluid immediately enters the static mixer 15. After a certain distance and time of mixing, the O2 is fully mixed and dissolved in the solution.

[0064] The present invention designs and develops a new gas-liquid countercurrent stirring mixer, combines the outlet pipeline with a static mixer to achieve the initial dissolution and final dissolution of oxygen in the solution. The device has a compact structure, simple operation, high performance and low cost.

[0065] To further understand the present invention, the gas-liquid mixing intensification system and method for in-situ leaching of uranium provided by the present invention are described in detail below with reference to the following examples. The scope of protection of the present invention is not limited by the following examples.

[0066] Example 1

[0067] A gas-liquid mixing intensification system for in-situ leaching of uranium comprises: a gas-liquid countercurrent stirring mixer 1 and a static mixer 15;

[0068] The gas-liquid countercurrent stirring mixer 1 is an upper cylinder and lower cone structure, and a circular fluid distribution plate 11 is provided at the junction of the cylinder and cone;

[0069] The cylinder and the cone are welded into an integral structure, and the cone gradually shrinks downward; the height-to-diameter ratio of the cylinder is 2, and the height ratio of the cylinder to the cone is preferably 2, and the material is 304 stainless steel.

[0070] The circular fluid distribution plate is preferably a porous structure, with a plurality of circular channels evenly arranged on the circular plate, and the channel diameter is preferably 10 mm.

[0071] The upper end of the cylinder side wall is connected to a tapered CO2 inlet pipe 3, which directly enters the internal pipeline of the cylinder horizontally. The CO2 inlet pipe 3 is connected to the tapered liquid inlet pipe 2 in the vertical direction, and the two merge and enter the cylinder space;

[0072] The end of the tubing inside the cylinder is connected to the liquid distributor 4 after a 90° bend. After the CO2 and liquid merge, it dissolves in the liquid and enters the tubing inside the cylinder. After a 90° bend, it flows vertically downward, then passes through the liquid distributor 4, transforming from a single stream into multiple streams and entering the cylinder. The liquid distributor 4 comprises a cavity with a tubing extending from the bottom. An even number of tubings of uniform length are evenly distributed around the cavity, matching the tubing at the bottom of the cavity.

[0073] The side wall of the vertebral body is connected to a tapered O2 inlet pipe 12 in a horizontal entry manner; the bottom of the vertebral body is connected to a base 13.

[0074] A stirring device is installed beside the cylinder, and the stirring device consists of a motor 7, a rotating shaft 8 and blades 9; the end of the stirring shaft 8 is connected to the blades 9 and is located inside the cylinder.

[0075] In order to facilitate observation of the liquid level 6 inside the cylinder, the cylinder is further provided with a visual window 5 .

[0076] The length of the blade 9 in the horizontal state is smaller than the diameter of the cylinder, and the blade is lower than the bottom end of the viewing window when it is kept in the vertical state;

[0077] The blades are located at least at the axial center of the cylinder; and there are two blades.

[0078] The lower end of the side wall of the cylinder is connected in sequence to a gradually expanding circular fluid outlet pipe 10, a static mixer 15 and a well site injection drilling pipeline 16; the pipeline axis of the fluid outlet pipe is coaxial with the rotation axis of the stirring device.

[0079] The static mixer 15 is a pipe with internal components. The pipe contains two types of units. One unit is a spiral plate formed by twisting a rectangular plate 180° to the left, and the other unit is a spiral plate formed by twisting a rectangular plate 180° to the right. The two units are arranged in sequence at 90° to each other and fill the entire static mixer. The static mixer is 1m long, has an aspect ratio of 60, and is made of 304 stainless steel.

[0080] The device was installed and tested in a uranium mine in Xinjiang, my country.

[0081] In this embodiment, the liquid flow rate is 7.5m 3 / h, CO2 flow rate is 1.8m 3 / h, O2 flow rate is 2.4m 3 / h, the stirring motor speed is 200r / min, and oxygen mixing and dissolving are carried out according to the above steps. The solubility of oxygen is measured three times at the outlet of the static mixer using a handheld dissolved oxygen meter, and the average value is 36.85mg / L. It can be seen that the present invention effectively increases the solubility of oxygen in the leachate.

[0082] The above embodiments are only intended to help understand the method and core concept of the present invention. It should be noted that, without departing from the principles of the present invention, a number of improvements and modifications may be made to the present invention by those skilled in the art, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0083] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gas-liquid mixing intensification method for in-situ leaching of uranium, characterized in that: The following steps are performed using a gas-liquid mixing intensification system: The gas-liquid mixing enhancement system includes: a gas-liquid countercurrent stirring mixer and a static mixer; The gas-liquid countercurrent stirring mixer has an upper cylinder and lower cone structure, with a circular fluid distribution plate provided at the junction of the cylinder and cone. The upper end of the cylinder side wall is connected to a CO2 inlet pipe, which directly enters the internal pipeline of the cylinder. The CO2 inlet pipe is connected to the liquid inlet pipe in a vertical direction. The end of the internal pipeline of the cylinder is bent 90 degrees and connected to the liquid distributor. The side wall of the vertebral body is connected to an O2 inlet tube; the bottom of the vertebral body is connected to the base; A stirring device is installed on the side of the cylinder, and the stirring device consists of a motor, a rotating shaft and blades; the end of the stirring shaft is connected to the blades and is located inside the cylinder; The lower end of the side wall of the cylinder is connected in sequence to the fluid outlet pipe, the static mixer and the well site injection drilling pipeline; The static mixer is a pipe with internal components. The pipe contains two types of units. One unit is a spiral plate formed by twisting a rectangular plate 180 degrees to the left, and the other unit is a spiral plate formed by twisting a rectangular plate 180 degrees to the right. The two units are arranged in sequence at 90 degrees to fill the entire interior of the static mixer. A valve is provided between the fluid outlet pipe and the static mixer; (1) Connect the CO2 inlet pipe, O2 inlet pipe, liquid inlet pipe and fluid outlet pipe; (2) Close the outlet valve of the gas-liquid countercurrent stirring mixer, open the stirrer, and introduce the fluid; (3) When the liquid level in the container reaches a threshold height, the outlet valve is opened; (4) The fluid is passed through the fluid outlet of the gas-liquid countercurrent stirring mixer to the static mixer, and then the dissolved oxygen content is measured at the static mixer outlet. The fluid then flows through the pipeline to the injection borehole at the well site.

2. The gas-liquid mixing intensification method for in-situ leaching of uranium according to claim 1, characterized in that: Observe the liquid level in the container by looking through the visual window, and when the liquid level in the container reaches the threshold height, open the outlet valve.

3. The gas-liquid mixing intensification method for in-situ leaching of uranium according to claim 1, characterized in that: The height-to-diameter ratio of the cylinder is 1.5-3.0, the height ratio of the cylinder to the cone is 1.5-2.5, and the material is 304 or 316L stainless steel.

4. The gas-liquid mixing intensification method for in-situ leaching of uranium according to claim 1, characterized in that: The liquid distributor comprises a cavity, a pipeline extends outward from the bottom of the cavity, and an even number of pipelines with the same length are evenly arranged around the cavity and are consistent with the length of the pipeline at the bottom of the cavity.

5. The gas-liquid mixing intensification method for in-situ leaching of uranium according to claim 1, characterized in that: The circular fluid distribution plate is a porous structure, and a plurality of circular channels are evenly provided on the circular plate, and the channel diameter is 2 to 15 mm.

6. The gas-liquid mixing intensification method for in-situ leaching of uranium according to claim 1, characterized in that: The CO2 inlet pipe, O2 inlet pipe and liquid inlet pipe all adopt tapered circular inlets with a tapering ratio of 0.4 to 0.75; the CO2 inlet pipe enters horizontally, the liquid inlet pipe enters vertically, and the two enter the cylinder space after merging; the O2 inlet pipe enters horizontally.

7. The gas-liquid mixing intensification method for in-situ leaching of uranium according to claim 1, characterized in that: The valve is a common ball-shaped or gate-shaped valve.

8. The gas-liquid mixing intensification method for in-situ leaching of uranium according to claim 1, characterized in that: The cylinder is also provided with a visual window for observing the liquid level inside the cylinder.

9. The gas-liquid mixing intensification method for in-situ leaching of uranium according to claim 8, characterized in that: The length of the blade in the horizontal state is smaller than the diameter of the cylinder, and the blade is lower than the bottom end of the viewing window when it is kept in the vertical state; The blades are located at least at the axial center of the cylinder or toward the right half of the cylinder close to the fluid outlet pipe; the number of blades is even and at least 2.

10. The gas-liquid mixing intensification method for in-situ leaching of uranium according to claim 1, characterized in that: The fluid outlet pipe is a gradually expanding circular outlet pipe, and the pipe axis is coaxial with or lower than the rotation axis of the stirring device.

11. The gas-liquid mixing intensification method for in-situ leaching of uranium according to claim 1, characterized in that: The static mixer has a length of 1 to 1.5 m, an aspect ratio of 20 to 40, and is made of 304 or 316L stainless steel.

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