An experimental system and application method for CO2+O2 in-situ leaching mining

Abstract

The application discloses a CO2+O2 in-situ leaching experiment system and an application method. The CO2+O2 in-situ leaching experiment system and the application method comprise a gas-liquid mixing mechanism, a reaction mechanism, an information monitoring and control mechanism and a recovery testing mechanism. The gas-liquid mixing mechanism is mainly provided with a liquid oxygen bottle, a liquid carbon dioxide bottle, a gasification box I, a gasification box II, a constant-pressure storage box I, a constant-pressure storage box II, a liquid storage box I, a liquid storage box II and a gas-liquid multi-item mixing box. The reaction mechanism is mainly provided with a water drive hydraulic cylinder I, a water drive hydraulic cylinder II, a liquid injection box, a liquid recovery box and a uranium ore sample holder. The monitoring and control mechanism is mainly provided with a hydraulic pump I, a hydraulic pump II, a hydraulic pump III, a hydraulic controller and a general controller. The recovery testing mechanism is mainly provided with a solution collector, a beaker and a pressure balance. The four mechanisms are closely matched to carry out CO2+O2 in-situ leaching laboratory simulation, and the dynamic characterization of the leaching process of the leaching liquid is realized.

Description

Technical Field

[0001] This invention relates to a CO2+O2 in-situ leaching mining experimental system and its application method. Background Technology

[0002] Uranium is a fundamental raw material for the nuclear industry and plays a vital role in national economic and military development. Compared with traditional mining methods, in-situ leaching of uranium offers advantages such as high economic efficiency, minimal environmental impact, and high resource utilization. The most important aspects of CO2+O2 in-situ leaching of uranium involve exploring the dissolution mechanism of CO2+O2 in solution and the reactive solute transport process under gas-liquid two-phase mixing conditions. However, in the laboratory, it is impossible to conduct in-situ leaching experiments by mixing CO2+O2 with the initial leaching solution; currently, no final leaching solution is prepared for CO2+O2 in-situ leaching experiments in laboratories. Therefore, it is crucial to solve the problem of mixing CO2+O2 with the leaching solution in the laboratory and to conduct realistic reaction experiments on uranium ore samples in the leaching solution.

[0003] Currently, sandstone uranium leaching mining simulation test systems mainly involve injecting leaching agents into horizontal wells of the leaching unit via injection devices. The leaching agent penetrates the ore body and reacts chemically with uranium. The reacted leaching agent is then extracted through vertical wells using pumping devices. These systems all use pre-prepared leaching solutions and cannot perform mixed injection of CO2+O2 with the leaching solution, resulting in significant differences from actual engineering field conditions. Based on these limitations, there is an urgent need for a CO2+O2 in-situ leaching mining experimental system and its application method. This system would meet the requirements of experimental research on the geological response of CO2+O2 in-situ leaching mining, simulating a real geological environment to provide support for the research and development of key scientific technologies for in-situ leaching mining. Summary of the Invention

[0004] The purpose of this invention is to propose a CO2+O2 in-situ leaching mining experimental system. Based on a gas-liquid mixing mechanism, it achieves efficient mixing of CO2+O2 with the initial leaching solution and NH4HCO3 solution. A reaction mechanism simulates the actual geological environment, enabling a realistic reaction experiment with uranium ore samples in the leaching solution. A monitoring and control mechanism continuously monitors system flow and pH information and adjusts the experimental system accordingly. A recovery and testing mechanism collects and recovers the reacted leaching solution. The entire system achieves in-situ simulation of CO2+O2 in-situ leaching mining and monitors and analyzes multi-field coupled evolution characteristics. To achieve the above objectives, this invention adopts the following technical solution:

[0005] A CO2+O2 in-situ leaching mining experimental system. The system comprises: a gas-liquid mixing mechanism, a reaction mechanism, a monitoring and control mechanism, and a recovery and testing mechanism. The gas-liquid mixing mechanism includes a gasification tank I, a constant-pressure storage tank I, a liquid storage tank I, and a gas-liquid multi-stage mixing tank. One end of a gas flow meter I is connected to the constant-pressure storage tank I, and the other end is connected to the gas-liquid multi-stage mixing tank via a valve. The reaction mechanism includes a water-driven hydraulic cylinder I, a water-driven hydraulic cylinder II, and a uranium ore sample holder. One end of the uranium ore sample holder is connected to the gas-liquid multi-stage mixing tank. One end is connected to the liquid flow meter III, and the other end is connected to the liquid flow meter III. The water-driven hydraulic cylinder I is located at the left end of the uranium ore sample holder, and the water-driven hydraulic cylinder II is located at the right end of the uranium ore sample holder. The monitoring and control mechanism includes a hydraulic controller and a main controller. The left and right ends of the hydraulic controller are connected to the liquid injection tank and the liquid recovery tank, respectively, and the lower end is connected to the main controller through a signal line. The recovery and testing mechanism includes a liquid flow meter III, a pH meter I, and a solution collector. The upper end of the solution collector is connected to the liquid flow meter III, and the pH meter I is fixed at its right end.

[0006] Preferably, one end of the liquid storage tank I is connected to the hydraulic pump I, and the other end is connected to the gas-liquid multi-component mixing tank via a liquid flow meter I.

[0007] Preferably, the liquid injection tank is connected to control valve I via a liquid pipeline, and the liquid recovery tank is connected to liquid pressure gauge III and control valve II via a liquid pipeline.

[0008] Preferably, the gas-liquid multi-component mixing chamber mainly includes a control lever I, a control lever II, a switch partition II, a switch partition I, a static mixer II, an atomizer, an atomizing nozzle, a stirring fan blade, a cavity III, a partition III, a stirring tray, a pH sensor II, a pH sensor I, a cavity II, and a static mixer I. The switch partition I is installed inside the static mixer I, and the control lever I is installed externally and connected to the switch partition I. The switch partition II is installed inside the static mixer II, and the control lever II is installed externally and connected to the switch partition II. The pH sensor II is installed in the cavity III, and the pH sensor I is installed in the cavity II.

[0009] Preferably, the upper end of the stirring tray is connected to the stirring fan blade, and the lower end is connected to the partition plate III. The left end of the atomizer is connected to the static mixer II, and the right end is connected to the atomizing nozzle.

[0010] Preferably, the uranium ore sample holder includes a displacement sensor, an axial pressure loading head, a confining pressure liquid injection valve, a confining pressure liquid recovery valve, and an outer wall of the holder. The displacement sensor is connected to the axial pressure loading head, and the outer wall of the holder is connected to the confining pressure liquid injection valve and the confining pressure liquid recovery valve.

[0011] Preferably, the confining pressure liquid injection valve is connected to the liquid injection tank and the liquid pressure gauge II via a liquid pipeline, and the confining pressure liquid recovery valve is connected to the liquid recovery tank via a liquid pipeline.

[0012] This invention also proposes an application method for a CO2+O2 in-situ leaching mining experimental system. The application of the above system includes the following working steps:

[0013] a. According to the actual project, add the prepared initial solution of leaching solution to liquid storage tank I, add the prepared NH4HCO3 solution to liquid storage tank II, turn on hydraulic pump I and valve, and control the liquid flow meter I to inject an appropriate volume of initial solution of leaching solution according to the established gas-liquid ratio.

[0014] b. Open the liquid oxygen cylinder. The liquid oxygen is vaporized through vaporization box II and enters constant pressure storage box II. Adjust constant pressure storage box II to a suitable pressure. Open the control valve and control the gas flow meter II to inject appropriate O2 gas according to the set gas-liquid ratio. Open the liquid carbon dioxide cylinder. The liquid oxygen is vaporized through vaporization box I and enters constant pressure storage box I. Adjust constant pressure storage box I to a suitable pressure.

[0015] c. The initial solution and O2 gas enter the gas-liquid multi-stage mixing chamber. Close the valve and control lever I that control the initial solution and O2 gas. Push lever I to the right to increase the pressure in chamber I. The initial solution and O2 are fully mixed in the high-pressure space. Push lever II downward to decrease the pressure in chamber II and create a negative pressure. Close control lever II and open control lever I. The solution mixture will enter the negative pressure space of chamber II from the high-pressure space in chamber I. At the same time, the solution mixture will pass through static mixer I.

[0016] d. Once the entire leaching solution mixture has entered chamber II, close control lever I and adjust it to a suitable pressure. Open the CO2 gas control valve and, according to the established gas-liquid ratio, control gas flow meter I to inject a suitable amount of CO2 gas. Close the CO2 gas control valve and push push rod II upwards to increase the pressure in chamber II. The leaching solution mixture and CO2 will mix thoroughly in the high-pressure space. Open control lever II and continue pushing push rod II. The leaching solution mixture will pass through static mixer II and enter the atomizer, then be sprayed out from the atomizing nozzle. Once the entire leaching solution mixture has entered chamber III, close control lever II and open the valve controlling the NH4HCO3 solution and hydraulic pump II. According to the established gas-liquid ratio, control liquid flow meter II to inject a suitable volume of NH4HCO3 solution. Turn on the stirring fan to ensure thorough mixing of the solution. Simultaneously, observe the pH change before and after mixing using pH meter II and pH meter III. Turn on hydraulic pump III to inject the final leaching solution into the reaction mechanism.

[0017] e. Open the confining pressure liquid injection valve and hydraulic controller, and set the appropriate confining pressure according to the actual needs based on the liquid pressure gauge II. At the same time, open the control valve I and set the appropriate axial pressure according to the actual needs based on the liquid pressure gauge III. The final leaching liquid enters through the leaching liquid inlet of the uranium ore sample holder, reacts in the uranium ore sample chamber, and flows out from the leaching liquid outlet.

[0018] f. The liquid passes through the liquid flow meter III, and the change in the liquid flow rate is observed. It enters the solution collector, and the change in the pH value of the solution is detected by the pH meter I. The liquid finally drips into the beaker, and the change in its weight is detected by the pressure balance.

[0019] g. At the end of the experiment, open control valve II and the confining pressure liquid recovery valve to recover the pressure liquid into the liquid recovery tank.

[0020] The present invention has the following advantages:

[0021] The CO2+O2 in-situ leaching experimental system described in this invention comprises a gas-liquid mixing mechanism, a reaction mechanism, a monitoring and control mechanism, and a recovery and testing mechanism. The gas-liquid mixing mechanism uses a multi-stage gas-liquid mixing chamber to mix CO2+O2 with the initial leaching solution and NH4HCO3 solution in a high-pressure chamber and a static mixer. Multiple chambers are set up to sequentially mix CO2 and O2 gases, achieving efficient multiphase gas-liquid mixing and overcoming the current situation where laboratory experiments can only use prepared leaching solutions for CO2+O2 in-situ leaching. The reaction mechanism, through the design of a uranium ore sample holder and a pressure system, simulates the formation environment of axial pressure and confining pressure during in-situ leaching experiments, and allows for the recovery and reuse of the experimental pressure fluid. The information monitoring and control mechanism controls the entire experimental system through signal transmission and monitors system data in real time. The recovery and testing mechanism collects the leaching solution after the experiment and tests relevant physical quantities. Attached Figure Description

[0022] When considered in conjunction with the accompanying drawings, the invention will be more fully and better understood by referring to the following detailed description, and many of its accompanying beneficial effects will readily become apparent. However, the accompanying drawings, which are provided to further illustrate the invention and form part of this invention, are used to explain the invention and do not constitute an undue limitation thereof.

[0023] Figure 1 This is an overall diagram of a CO2+O2 in-situ leaching mining experimental system according to the present invention;

[0024] Figure 2 This is a schematic diagram of the gas-liquid multi-stage mixing tank of the gas-liquid mixing mechanism in a CO2+O2 in-situ leaching mining experimental system of the present invention;

[0025] Figure 3This is a schematic diagram of the uranium ore sample holder in the reaction mechanism of a CO2+O2 in-situ leaching mining experimental system of the present invention.

[0026] Explanation of reference numerals in the attached diagrams: 1-1-Liquid oxygen cylinder; 1-2-Liquid carbon dioxide cylinder; 1-3-Vaporization chamber I; 1-4-Constant pressure storage chamber I; 1-5-Gas flow meter I; 1-6-Vaporization chamber II; 1-7-Constant pressure storage chamber II; 1-8-Gas flow meter II; 1-9-Gas-liquid multi-stage mixing chamber; 1-10-Liquid storage chamber I; 1-11-Liquid flow meter I; 1-12-Liquid flow meter II; 1-13-Liquid storage chamber II; 1-14-Liquid pressure gauge I; 2-1-Uranium ore sample holder; 2-2-Liquid pressure gauge II; 2-3-Water-driven hydraulic cylinder II; 2-4-Liquid... 2-5 Liquid recovery tank; 2-6 Liquid injection tank; 2-7 Liquid pressure gauge III; 2-8 Control valve I; 2-9 Control valve II; 2-1 Water-driven hydraulic cylinder I; 3-1 Hydraulic pump I; 3-2 Hydraulic pump III; 3-3 Hydraulic pump II; 3-4 Hydraulic controller; 3-5 Main controller; 4-1 Solution collector; 4-2 Beaker; 4-3 Pressure balance; 4-4 Liquid flow meter III; 4-5 pH meter I; 1-9-1 Push rod I; 1-9-2 Baffle; 1-9-3 Liquid nozzle I; 1-9-4 Control lever I; 1-9-5 Gas nozzle I ; 1-9-6-Gas Nozzle II; 1-9-7-Control Lever II; 1-9-8-Switch Partition II; 1-9-9-Static Mixer II; 1-9-10-Atomizer; 1-9-11-Atomizing Nozzle; 1-9-12-Liquid Nozzle II; 1-9-13-Mixed Liquid Outlet; 1-9-14-Agitator Blade; 1-9-15-Cavity III; 1-9-16-Hydraulic Fluid Inlet; 1-9-17-Hydraulic Fluid Chamber; 1-9-18-Baffle III; 1-9-19-Agitator Tray; 1-9-20-pH Sensor II; 1-9-21-Push Rod II; 1-9-22 -pH sensor I; 1-9-23-Baffle II; 1-9-24-Cavity II; 1-9-25-Static mixer I; 1-9-26-Switch baffle I; 1-9-27-Cavity I; 1-9-28-pH meter II; 1-9-29-pH meter III; 2-1-1-Displacement sensor; 2-1-2-Bolt; 2-1-3-Leaching solution inlet; 2-1-4-Axial pressure loading head; 2-1-5-Containing pressure liquid injection valve; 2-1-6-Containing pressure liquid recovery valve; 2-1-7-Uranium ore sample chamber; 2-1-8-Clamping device outer wall; 2-1-9-Leaching solution outlet. Detailed Implementation

[0027] Combination Figure 1As shown, a CO2+O2 in-situ leaching mining experimental system includes a gas-liquid mixing mechanism, a reaction mechanism, a monitoring and control mechanism, and a recovery and testing mechanism. Through the close cooperation of these four mechanisms, in-situ simulation of CO2+O2 in-situ leaching mining can be achieved, and the multi-field coupled evolution characteristics can be monitored and analyzed.

[0028] In the gas-liquid mixing mechanism, one end of the vaporization tank I1-3 is connected to the liquid carbon dioxide cylinder 1-2, and the other end is connected to the constant pressure storage tank I1-4. One end of the vaporization tank II1-6 is connected to the liquid oxygen cylinder 1-1, and the other end is connected to the constant pressure storage tank II1-7. One end of the gas flow meter I1-5 is connected to the constant pressure storage tank I1-4, and the other end is connected to the gas nozzle II1-9-6 via a valve. One end of the gas flow meter II1-8 is connected to the constant pressure storage tank II1-7. -7 is connected, and the other end is connected to the gas nozzle I1-9-5 via a valve. One end of the liquid storage tank I1-10 is connected to the hydraulic pump I3-1, and the other end is connected to the liquid flow meter I1-11. One end of the liquid storage tank II1-13 is connected to the hydraulic pump II3-3, and the other end is connected to the liquid flow meter II1-12. One end of the liquid pressure gauge I1-14 is connected to the hydraulic pump III3-2, and the other end is connected to the hydraulic fluid inlet 1-9-16.

[0029] In the reaction mechanism, one end of the uranium ore sample holder 2-1 is connected to the gas-liquid multi-stage mixing tank 1-9, and the other end is connected in series with the liquid flow meter Ⅲ4-4 and the solution collector 4-1. The water-driven hydraulic cylinder Ⅰ2-9 is located at the left end of the uranium ore sample holder 2-1, and the water-driven hydraulic cylinder Ⅱ2-3 is located at the right end of the uranium ore sample holder 2-1. The liquid injection tank 2-5 is connected to the control valve Ⅰ2-7 through a liquid pipeline. The liquid recovery tank 2-4 is connected to the liquid pressure gauge Ⅲ2-6 and the control valve Ⅱ2-8 through a liquid pipeline. The confining pressure liquid injection valve 2-1-5 is connected to the liquid injection tank 2-5 and the liquid pressure gauge Ⅱ2-2 through a liquid pipeline. The confining pressure liquid recovery valve 2-1-6 is connected to the liquid recovery tank 2-4 through a liquid pipeline.

[0030] In the monitoring and control mechanism, the hydraulic controller 3-4 is connected to the liquid injection tank 2-5 and the liquid recovery tank 2-4 at its left and right ends respectively, and its lower end is connected to the main controller 3-5 via a signal line. The hydraulic pump I 3-1 is connected to the main controller 3-5 via a signal line, the hydraulic pump II 3-3 is connected to the main controller 3-5 via a signal line, the hydraulic pump III 3-2 is connected to the main controller 3-5 via a signal line, the pH meter II 1-9-28 and the pH meter III 1-9-29 are connected in series to the main controller 3-5 via a signal line to monitor changes in the solution pH value, the pH meter I 4-5 is connected to the main controller 3-5 via a signal line, and the liquid flow meter III 4-4 is connected to the main controller 3-5 via a signal line to monitor changes in permeability during the reaction process.

[0031] In the recycling test mechanism, the upper end of the solution collector 4-1 is connected to the liquid flow meter Ⅲ4-4 pipe, and the right end is connected to the pH meter Ⅰ4-5. The beaker 4-2 is located above the pressure balance 4-3.

[0032] Combination Figure 2 As shown, the push rod I1-9-1 is connected to the partition I1-9-2; the gas nozzle I1-9-2 and the liquid nozzle I1-9-3 are housed in the cavity I1-9-27; the switch partition I1-9-26 is housed inside the static mixer I1-9-25; the control rod I1-9-4 is externally mounted and connected to the switch partition I1-9-26; the gas nozzle II1-9-6 and the pH sensor I1-9-22 are housed in the cavity II1-9-24; the push rod II1-9-21 is connected to the partition II1-9-23; and the switch is housed inside the static mixer II1-9-9. The control rod II1-9-7 is externally mounted on the partition II1-9-8 and connected to the switch partition II1-9-9. The pH sensor II1-9-20, liquid nozzle II1-9-12, and mixture outlet 1-9-13 are housed in the cavity III1-9-15. The upper end of the stirring tray 1-9-19 is connected to the stirring blade 1-9-14, and the lower end is connected to the partition III1-9-18. The hydraulic fluid inlet 1-9-16 is housed in the hydraulic fluid cavity 1-9-17. The left end of the atomizer 1-9-10 is connected to the static mixer II1-9-9, and the right end is connected to the atomizing nozzle 1-9-11.

[0033] Combination Figure 3As shown, the displacement sensor 2-1-1 is connected to the axial pressure loading head 2-1-4, the left end of the uranium ore sample chamber 2-1-7 is connected to the leaching liquid inlet 2-1-3, and the right end is connected to the leaching liquid outlet 2-1-9 through a pipe, the outer wall 2-1-8 of the clamp is connected to the confining pressure liquid injection valve 2-1-5 and the confining pressure liquid recovery valve 2-1-6, and the bolt 2-1-2 is installed in the outer wall of the clamp.

[0034] The specific steps are roughly as follows:

[0035] a. According to the actual project, add the prepared initial solution of leaching solution to liquid storage tank Ⅰ1-10, add the prepared NH4HCO3 solution to liquid storage tank Ⅱ1-13, turn on hydraulic pump Ⅰ3-1 and valve, and control the liquid flow meter Ⅰ1-11 to inject an appropriate volume of initial solution of leaching solution according to the established gas-liquid ratio.

[0036] b. Open liquid oxygen cylinder 1-1. Liquid oxygen is vaporized through vaporization box II1-6 and enters constant pressure storage box II1-7. Adjust constant pressure storage box II1-7 to a suitable pressure. Open the control valve and control the gas flow meter II1-8 to inject appropriate O2 gas according to the set gas-liquid ratio. Open liquid carbon dioxide cylinder 1-2. Liquid oxygen is vaporized through vaporization box I1-3 and enters constant pressure storage box I1-4. Adjust constant pressure storage box I1-4 to a suitable pressure.

[0037] c. The initial leaching solution and O2 gas enter the gas-liquid multi-mixing chamber 1-9. Close the valve and control lever I1-9-4 that control the initial leaching solution and O2 gas. Push the push lever I1-9-4 to the right to increase the pressure in chamber I1-9-27. The initial leaching solution and O2 are fully mixed in the high-pressure space. Push the push lever II1-9-21 downward to decrease the pressure in chamber II1-9-24 and create a negative pressure. Close the control lever II1-9-7 and open the control lever I1-9-4. The leaching solution mixture will enter the negative pressure space of chamber II1-9-24 from the high-pressure space of chamber I1-9-27. At the same time, the leaching solution mixture will pass through the static mixer I1-9-25.

[0038] d. Once the entire leaching solution mixture has entered chamber II1-9-24, close control lever I1-9-4 and adjust it to a suitable pressure. Open the CO2 gas control valve and, according to the predetermined gas-liquid ratio, inject the appropriate amount of CO2 gas using gas flow meter I1-5. Close the CO2 gas control valve and push push lever II1-9-21 upwards to increase the pressure in chamber II1-9-24. The leaching solution mixture and CO2 will then mix thoroughly in the high-pressure space. Open control lever II1-9-7 and continue pushing push lever II1-9-21. The leaching solution mixture will then pass through static mixer II1-9-9 and enter atomizer 1. -9-10 and sprayed from atomizing nozzle 1-9-11. After all the leaching solution mixture enters the cavity Ⅲ1-9-15, close control lever Ⅱ1-9-7, open valve controlling NH4HCO3 solution and hydraulic pump Ⅱ1-13, and according to the set gas-liquid ratio, control liquid flow meter Ⅱ1-12 to inject an appropriate volume of NH4HCO3 solution, open stirring fan blade 1-9-14 to make the solution fully mixed, and at the same time observe the pH change before and after mixing of leaching solution through pH meter Ⅱ1-9-28 and pH meter Ⅲ1-9-29. Open hydraulic pump Ⅲ3-2 to inject the final leaching solution into the reaction mechanism.

[0039] e. Open the confining pressure liquid injection valve 2-15 and the hydraulic controller 3-4. Set the appropriate confining pressure according to the actual needs based on the liquid pressure gauge II 2-2. At the same time, open the control valve I 2-7. Set the appropriate axial pressure according to the actual needs based on the liquid pressure gauge III 2-6. The final leaching liquid enters through the leaching liquid inlet 2-1-3 of the uranium ore sample holder 2-1, reacts in the uranium ore sample chamber 2-1-7, and flows out from the leaching liquid outlet 2-1-9.

[0040] f. The liquid passes through the liquid flow meter Ⅲ4-4, and the change in the liquid flow rate is observed. It enters the solution collector 4-1, and the change in the pH value of the solution is detected by the pH meter Ⅰ4-5. The liquid finally drips into the beaker 4-2, and the change in its weight is detected by the pressure balance 4-3.

[0041] g. At the end of the experiment, open control valve II 2-8 and confining pressure liquid recovery valve 2-1-6 to recover the pressure liquid to the liquid recovery tank 2-4.

[0042] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A CO2+O2 in-situ leaching extraction experimental system, characterized in that: The CO2+O2 in-situ leaching mining experimental system includes: a gas-liquid mixing mechanism, a reaction mechanism, a monitoring and control mechanism, and a recovery and testing mechanism. The gas-liquid mixing mechanism includes a gasification tank I, a constant-pressure storage tank I, a liquid storage tank I, and a gas-liquid multi-stage mixing tank. One end of the constant-pressure storage tank I is connected to a gas flow meter I, and the other end of the gas flow meter I is connected to the gas-liquid multi-stage mixing tank via a valve. The reaction mechanism includes a water-driven hydraulic cylinder I, a water-driven hydraulic cylinder II, and a uranium ore sample holder. One end of the uranium ore sample holder is connected to the gas-liquid multi-stage mixing tank. The other end is connected to the liquid flow meter III. The water-driven hydraulic cylinder I is located at the left end of the uranium ore sample holder, and the water-driven hydraulic cylinder II is located at the right end of the uranium ore sample holder. The monitoring and control mechanism includes a hydraulic controller and a main controller. The left and right ends of the hydraulic controller are respectively connected to the liquid injection tank and the liquid recovery tank, and the lower end is connected to the main controller through a signal line. The recovery and testing mechanism includes a liquid flow meter III, a pH meter I, and a solution collector. The upper end of the solution collector is connected to the liquid flow meter III, and the pH meter I is fixed at the right end of the solution collector. In the gas-liquid mixing mechanism, one end of the vaporization tank I is connected to a liquid carbon dioxide cylinder, and the other end is connected to the constant pressure storage tank I; one end of the vaporization tank II is connected to a liquid oxygen cylinder, and the other end is connected to the constant pressure storage tank II; one end of the gas flow meter I is connected to the constant pressure storage tank I, and the other end is connected to the gas nozzle II through a valve; one end of the gas flow meter II is connected to the constant pressure storage tank II, and the other end is connected to the gas nozzle I through a valve; one end of the liquid storage tank I is connected to the hydraulic pump I, and the other end is connected to the liquid flow meter I; one end of the liquid storage tank II is connected to the hydraulic pump II, and the other end is connected to the liquid flow meter II. The gas-liquid multi-component mixing chamber includes a cavity I, a control rod I, a control rod II, a switch partition II, a switch partition I, a static mixer II, an atomizer, an atomizing nozzle, a stirring fan blade, a cavity III, a partition III, a stirring tray, a pH sensor II, a pH sensor I, a cavity II, and a static mixer I. The static mixer I is disposed between the cavity I and the cavity II. The switch partition I is housed inside the static mixer I, and the control rod I is externally mounted and connected to the switch partition I. The static mixer II is disposed between the cavity II and the cavity III. The switch partition II is housed inside the static mixer II, and the control rod II is externally mounted and connected to the switch partition II. The cavity I is equipped with a liquid nozzle I and a gas nozzle I. The liquid nozzle I is connected to a liquid flow meter I, and the gas nozzle I is connected to a gas flow meter II. These are used to introduce the initial solution and O2 gas, respectively. The cavity II is equipped with a gas nozzle II, which is connected to a gas flow meter I. This is used to introduce CO2 gas. The cavity III is equipped with a liquid nozzle II, which is connected to a liquid flow meter II. This is used to replenish the NH4HCO3 solution. The outlet end of the static mixer II is connected to the atomizer, and the outlet end of the atomizer is connected to the atomizing nozzle. This is used to atomize the gas-liquid mixture and spray it into the cavity III. The cavity III is equipped with a stirring tray and a stirring blade. The upper end of the stirring tray is connected to the stirring blade, and the lower end is connected to the partition III. This is used to perform high-pressure stirring and mixing of the atomized gas-liquid mixture. The pH sensor I is installed in cavity II and connected to pH meter II. The pH sensor II is installed in cavity III and connected to pH meter III. The pH sensor II is used to determine the pH value in the preliminary mixing stage and the final mixing stage, respectively. A mixed liquid outlet is provided on one side of cavity III. The gas-liquid multiphase mixed liquid after uniform mixing is output from the mixed liquid outlet.

2. The CO2+O2 in-situ leaching mining experimental system according to claim 1, characterized in that: One end of the liquid storage tank I is connected to the hydraulic pump I, and the other end is connected to the gas-liquid multi-component mixing tank through the liquid flow meter I.

3. The CO2+O2 in-situ leaching mining experimental system according to claim 2, characterized in that: The liquid injection tank is connected to control valve I via a liquid pipeline, and the liquid recovery tank is connected to liquid pressure gauge III and control valve II via a liquid pipeline.

4. The CO2+O2 in-situ leaching mining experimental system according to claim 3, characterized in that: The uranium ore sample holder includes a displacement sensor, an axial pressure loading head, a confining pressure liquid injection valve, a confining pressure liquid recovery valve, and an outer wall of the holder. The displacement sensor is connected to the axial pressure loading head, and the outer wall of the holder is connected to the confining pressure liquid injection valve and the confining pressure liquid recovery valve.

5. The CO2+O2 in-situ leaching mining experimental system according to claim 4, characterized in that: The confining pressure liquid injection valve is connected to the liquid injection tank and the liquid pressure gauge II via a liquid pipeline, and the confining pressure liquid recovery valve is connected to the liquid recovery tank via a liquid pipeline.

6. An application method for a CO2+O2 in-situ leaching mining experimental system, characterized in that, The experimental system for CO2+O2 in-situ leaching mining as described in claim 5 includes the following steps: a. According to the actual project, add the prepared initial solution of leaching solution to liquid storage tank I, add the prepared NH4HCO3 solution to liquid storage tank II, turn on hydraulic pump I and valve, and control the liquid flow meter I to inject an appropriate volume of initial solution of leaching solution according to the established gas-liquid ratio. b. Open the liquid oxygen cylinder. The liquid oxygen is vaporized through vaporization box II and enters constant pressure storage box II. Adjust constant pressure storage box II to a suitable pressure. Open the control valve and control the gas flow meter II to inject appropriate O2 gas according to the set gas-liquid ratio. Open the liquid carbon dioxide cylinder. The liquid oxygen is vaporized through vaporization box I and enters constant pressure storage box I. Adjust constant pressure storage box I to a suitable pressure. c. The initial solution and O2 gas enter the gas-liquid multi-stage mixing chamber. Close the valve and control lever I that control the initial solution and O2 gas. Push lever I to the right to increase the pressure in chamber I. The initial solution and O2 are fully mixed in the high-pressure space. Push lever II downward to decrease the pressure in chamber II and create a negative pressure. Close control lever II and open control lever I. The solution mixture will enter the negative pressure space of chamber II from the high-pressure space in chamber I. At the same time, the solution mixture will pass through static mixer I. d. Once all the leaching solution mixture has entered chamber II, close control lever I and adjust it to a suitable pressure. Open the CO2 gas control valve and, according to the set gas-liquid ratio, control gas flow meter I to inject a suitable amount of CO2 gas. Close the CO2 gas control valve and push push rod II upwards to increase the pressure in chamber II. The leaching solution mixture and CO2 will mix thoroughly in the high-pressure space. Open control lever II and continue pushing push rod II. The leaching solution mixture will pass through static mixer II and enter the atomizer, and be sprayed out from the atomizing nozzle. Once all the leaching solution mixture has entered chamber III, close control lever II and open the valve controlling the NH4HCO3 solution and hydraulic pump II. According to the set gas-liquid ratio, control liquid flow meter II to inject a suitable volume of NH4HCO3 solution. Turn on the stirring fan to mix the solution thoroughly. At the same time, observe the pH change before and after mixing the leaching solution using pH meter II and pH meter III. Turn on hydraulic pump III to inject the final leaching solution into the reaction mechanism. e. Open the confining pressure liquid injection valve and hydraulic controller, and set the appropriate confining pressure according to the actual needs based on the liquid pressure gauge II. At the same time, open the control valve I and set the appropriate axial pressure according to the actual needs based on the liquid pressure gauge III. The final leaching liquid enters through the leaching liquid inlet of the uranium ore sample holder, reacts in the uranium ore sample chamber, and flows out from the leaching liquid outlet. f. The liquid passes through the liquid flow meter III, and the change in the liquid flow rate is observed. It enters the solution collector, and the change in the pH value of the solution is detected by the pH meter I. The liquid finally drips into the beaker, and the change in its weight is detected by the pressure balance. g. At the end of the experiment, open control valve II and the confining pressure liquid recovery valve to recover the pressure liquid into the liquid recovery tank.

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