An experimental device for simulating in-situ leaching of uranium extraction cycle

Abstract

The application discloses a kind of simulated in-situ leaching uranium extraction cycle experimental device, it is related to experimental device technical field, including liquid injection component, gas source air inlet component, gas-liquid mixing component, leaching component and adsorption component, liquid injection component includes leaching agent intermediate container and liquid injection pump;Gas source air inlet component includes carbon dioxide air inlet component and oxygen air inlet component;Gas-liquid mixing component includes first mixing component and second mixing component, first mixing component includes first gas disperser and first gas-liquid mixer, carbon dioxide air inlet component is communicated with first gas disperser, second mixing component includes second gas disperser and second gas-liquid mixer;Adsorption component includes leaching solution intermediate container and ion exchange column, second gas-liquid mixer, leaching component, leaching solution intermediate container, ion exchange column and leaching agent intermediate container are sequentially communicated.The application improves the reliability, usability and accuracy of in-situ leaching uranium simulation experiment result.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of experimental devices, in particular to a simulation device for in-situ leaching uranium extraction cycle. BACKGROUND

[0002] With the rapid development of nuclear energy related industries, the demand for natural uranium is increasing. In-situ leaching (referred to as in-situ leaching) is the main process for mining natural uranium in China, and the CO2+O2 in-situ leaching process is currently the main process for mining natural uranium. Therefore, it is very important to develop an experimental device that can simulate the whole process of CO2+O2 in-situ leaching uranium extraction process for the indoor screening and evaluation of in-situ leaching parameters.

[0003] For CO2+O2 process in-situ leaching uranium extraction simulation, a variety of experimental devices have been developed (ZL201210380565.8, ZL201610018577.4, ZL201810303870.4, CN202122537831.9), these devices all use freshly prepared leaching agent for leaching, and cannot perform tests such as actual ion accumulation cycle and adsorption; CN201710545851.8 designs a laboratory simulation test device and method for acid in-situ leaching uranium mining, which can simulate the in-situ leaching and adsorption treatment system, evaluate the risk of ore layer blockage caused by impurity ion accumulation and precipitation, and CN201911327521.7 similarly develops a CO2+O2 process in-situ leaching uranium extraction cycle experimental device.

[0004] The existing simulation in-situ leaching uranium extraction experimental device has the following shortcomings:

[0005] (1) Since the CO2+O2 column leaching experiment flow is very small, the general flow rate is 0.05-0.20 ml / min, and the soluble oxygen is below 0.10 ml / min, there is no suitable gas flow meter or controller to measure and control. Therefore, a dissolving tank is used to dissolve CO2 and O2 in the dissolving tank, and then the leaching agent after dissolving gas is injected into the leaching column through an intermediate liquid injection tank or directly injected into the leaching column, such as ZL201210380565.8, ZL201610018577.4, CN201911327521.7, CN202122537831.9, which is different from the direct pipeline addition of CO2 and O2 to the leaching agent in the in-situ leaching uranium mining, resulting in the inability to directly simulate;

[0006] (2) Due to the small overall flow rate (50-300 ml / d) in indoor simulation, it is difficult to dynamically simulate the whole process in a cycle. Although CN201911327521.7 proposes a full-process circulating experimental device, the liquid collection tank has a capacity of 500 ml, and the stirring tank has a capacity of 200 ml. The circulating amount of the system exceeds two days, which is quite different from the mine's liquid collection amount of 0-2 h. The leaching agent used in CN201710545851.8 is 2L and 3L, respectively, and the amount in the storage tank and preparation tank also makes the experiment significantly lag. SUMMARY

[0007] The purpose of the present application is to provide a simulation of in-situ leaching of uranium extraction circulating experimental device to solve the problems existing in the prior art, improve the reliability, usability and accuracy of the simulation experiment results of in-situ leaching of uranium.

[0008] To achieve the above-mentioned purpose, the present application provides the following scheme:

[0009] The present application provides a simulation of in-situ leaching of uranium extraction circulating experimental device, comprising a liquid injection assembly, a gas source gas inlet assembly, a gas-liquid mixing assembly, a leaching assembly and an adsorption assembly;

[0010] The liquid injection assembly comprises a leaching agent intermediate container and a liquid injection pump, the liquid inlet of the liquid injection pump is in communication with the liquid outlet of the leaching agent intermediate container; the gas source gas inlet assembly comprises a carbon dioxide gas inlet assembly and an oxygen gas inlet assembly, the carbon dioxide gas inlet assembly comprises a first gas mass flow controller, and the oxygen gas inlet assembly comprises a second gas mass flow controller; the gas-liquid mixing assembly comprises a first mixing assembly and a second mixing assembly, the first mixing assembly comprises a first gas disperser and a first gas-liquid mixer, the first gas disperser is arranged in the first gas-liquid mixer, the liquid outlet of the liquid injection pump is in communication with the liquid inlet of the first gas-liquid mixer, the second mixing assembly comprises a second gas disperser and a second gas-liquid mixer, the second gas disperser is arranged in the second gas-liquid mixer, the liquid inlet of the second gas-liquid mixer is in communication with the liquid outlet of the first gas-liquid mixer, the gas outlet of the carbon dioxide gas inlet assembly is in communication with the gas inlet of the first gas disperser, and the gas outlet of the oxygen gas inlet assembly is in communication with the gas inlet of the second gas disperser; the liquid outlet of the second gas-liquid mixer is in communication with the leaching assembly; the adsorption assembly comprises a leaching liquid intermediate container and an ion exchange column, the liquid inlet of the leaching liquid intermediate container is in communication with the liquid outlet of the leaching assembly; the liquid inlet of the ion exchange column is in communication with the liquid outlet of the leaching liquid intermediate container, and the liquid outlet of the ion exchange column is in communication with the liquid inlet of the leaching agent intermediate container.

[0011] The injection pump is a horizontal flow pump, and the flow range is 0.001-9.999 ml / min; during the experiment, the leaching agent is sucked from the leaching agent intermediate container by opening the horizontal flow pump and injected into the first mixing assembly.

[0012] Preferably, the first gas mass flow controller and the second gas mass flow controller are thermal mass flow controllers or differential pressure laminar mass flow controllers; the flow range of the first gas mass flow controller and the second gas mass flow controller is 0.005-0.200 ml / min.

[0013] Preferably, the carbon dioxide gas inlet assembly comprises a carbon dioxide gas cylinder, the gas outlet of the carbon dioxide gas cylinder is communicated with the gas inlet of the first gas disperser through a pipeline; the first gas mass flow controller is arranged on the communication pipeline between the gas outlet of the carbon dioxide gas cylinder and the first gas disperser, and a first high-pressure pressure-reducing valve, a first stop valve and a first check valve are further arranged on the communication pipeline between the gas outlet of the carbon dioxide gas cylinder and the first gas disperser; the oxygen gas inlet assembly comprises an oxygen gas cylinder, the gas outlet of the oxygen gas cylinder is communicated with the gas inlet of the second gas disperser through a pipeline; the second gas mass flow controller is arranged on the communication pipeline between the gas outlet of the oxygen gas cylinder and the second gas disperser, and a second high-pressure pressure-reducing valve, a second stop valve and a second check valve are further arranged on the communication pipeline between the gas outlet of the oxygen gas cylinder and the second gas disperser.

[0014] The carbon dioxide is metered through the carbon dioxide gas inlet assembly and enters the first gas-liquid mixer through the first gas disperser, and the carbon dioxide gas and the leaching liquid are mixed in the first gas-liquid mixer; the oxygen is metered through the gas source gas inlet assembly and enters the second gas-liquid mixer through the second gas disperser, and the oxygen gas and the leaching liquid are mixed in the second gas-liquid mixer; the leaching agent after two-stage mixing of carbon dioxide mixing and oxygen mixing enters the leaching assembly for leaching.

[0015] Preferably, the leaching assembly comprises at least one leaching column, when the leaching columns are at least two, all the leaching columns are connected in series; the leaching column adopts a sand-filled pipe or a full-diameter core holder, and the leaching assembly can specifically adopt 1-6 leaching columns connected in series.

[0016] Preferably, the leaching assembly further comprises a first pressure sensor, a second pressure sensor, a leaching back pressure valve and an online uranium concentration detector; the first pressure sensor is arranged on the communication pipeline between the liquid inlet of the leaching assembly and the liquid outlet of the second gas-liquid mixer, and the second pressure sensor, the leaching back pressure valve and the online uranium concentration detector are sequentially arranged on the communication pipeline between the liquid outlet of the leaching assembly and the liquid inlet of the leaching liquid intermediate container in the direction gradually away from the leaching assembly.

[0017] Preferably, a liquid mass flow controller is arranged on the connecting pipeline between the outlet of the ion exchange column and the inlet of the leaching agent intermediate container; a first liquid level sensor is arranged on the leaching agent intermediate container, and a second liquid level sensor is arranged on the leaching solution intermediate container.

[0018] In the experiment, the gas-liquid mixed leaching agent enters the leaching column for leaching, and the leaching solution flows out of the leaching part under the control of the leaching back pressure valve after leaching, simulates the formation pressure and controls the oxygen in the leaching agent from being precipitated. The leaching solution flowing out of the leaching assembly drips into the leaching solution intermediate container through the online uranium concentration detector, and then enters the ion exchange column from the leaching solution intermediate container, and flows back to the leaching agent intermediate container after adsorption under the control of the liquid mass flow controller.

[0019] Preferably, the automatic control unit further comprises a computer, and the first gas mass flow controller, the second gas mass flow controller, the first pressure sensor, the second pressure sensor, the first liquid level sensor, the second liquid level sensor, the liquid injection pump, the liquid mass flow controller and the online uranium concentration detector are respectively signal connected with the computer.

[0020] Preferably, the temperature control assembly further comprises a thermostat, and the thermostat is provided with heating structure and refrigeration structure, that is, the thermostat can heat and cool, and the leaching agent intermediate container, the liquid injection pump, the first gas-liquid mixer, the second gas-liquid mixer, the leaching assembly and the adsorption assembly are arranged in the thermostat.

[0021] Further, the leaching agent intermediate container and the leaching solution intermediate container adopt a columnar container with an inverted conical bottom, the inner diameter of the columnar part of the columnar container is 1-2 cm, and the volume of the columnar container is 10-20 mL.

[0022] Further, the inlet and outlet pressure difference of the first gas mass flow controller and the inlet and outlet pressure difference of the second gas mass flow controller are both 0.01-0.50 MPa.

[0023] Further, the first gas disperser and the second gas disperser are both powder metallurgy pressed columnar nozzles with a pore size of 1-5 mu m; the first gas-liquid mixer and the second gas-liquid mixer both adopt a venturi jet mixer or an SV static mixer; the leaching liquid enters the first gas-liquid mixer from the liquid inlet of the first gas-liquid mixer, and the carbon dioxide first enters the first gas disperser and then flows out of the first gas disperser to mix with the liquid in the first gas-liquid mixer; the leaching liquid enters the second gas-liquid mixer from the liquid inlet of the second gas-liquid mixer, and the oxygen first enters the second gas disperser and then flows out of the second gas disperser to mix with the leaching liquid in the second gas-liquid mixer.

[0024] Further, the inner diameter of the ion exchange column is ≤1 cm, and the volume is 10-20 mL.

[0025] Further, the liquid mass flow controller is a Coriolis mass flow controller or a differential pressure laminar flow controller, and the flow rate is 0.001-9.999 mL / min.

[0026] Further, the liquid mass flow controller, the liquid injection pump, the first liquid level sensor, the second liquid level sensor, the online uranium concentration detector and the control system are connected, the control system automatically controls the liquid injection amount of the liquid injection pump, the gas injection amount, the liquid flow rate of the ion exchange column, keeps the leaching agent intermediate container and the leaching liquid intermediate container at a set liquid level, and automatically calculates the leaching column permeability, the liquid-solid ratio, the uranium concentration, the leaching rate and other parameters by a set program.

[0027] The present application has the following technical effects relative to the prior art:

[0028] The simulated in-situ leaching uranium extraction circulation experimental device improves the reliability, usability and accuracy of the simulation experimental results of in-situ leaching uranium extraction, and can provide instrument support for screening and evaluating uranium extraction parameters similar to actual production.

[0029] The simulated in-situ leaching uranium extraction circulation experimental device can accurately measure and real-time add reagents such as oxygen and carbon dioxide, and can perform leaching and adsorption circulation experiments to reflect test dynamics, ion accumulation and plugging and other conditions.

[0030] The simulation in-situ leaching uranium extraction cycle experimental device of the application measures and controls the gas flow required by the experiment through a micro-flow gas mass flow controller, and directly carries out dissolution and leaching, thereby simulating the addition, dissolution and leaching of the gas in the in-situ leaching process, simplifying the experimental process; the leaching back pressure valve is placed in a thermostat, thereby ensuring the stability of the back pressure and the liquid outlet; the real-time leaching rate can be directly calculated during the experiment through an online uranium concentration detector; the leaching liquid intermediate container and the leaching agent intermediate container with liquid level sensors are used in combination with the liquid mass flow controller and the liquid injection pump, thereby ensuring the required liquid storage capacity, simulating the mine liquid collection and liquid preparation capacity, and improving the guiding significance of the experimental results to the actual production. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only constitute some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0032] Fig. 1 It is a structural schematic diagram of the simulation in-situ leaching uranium extraction cycle experimental device of the application.

[0033] Fig. 2 It is a structural schematic diagram of the leaching liquid intermediate container in the simulation in-situ leaching uranium extraction cycle experimental device of the application.

[0034] Among them, 1, carbon dioxide gas cylinder; 2, oxygen gas cylinder; 3-1, first high-pressure pressure reducing valve; 3-2, second high-pressure pressure reducing valve; 4-1, first stop valve; 4-2, second stop valve; 5-1, first gas mass flow controller; 5-2, second gas mass flow controller; 6-1, first check valve; 6-2, second check valve; 7, leaching agent intermediate container; 8, liquid injection pump; 9-1, first gas disperser; 9-2, second gas disperser; 10-1, first gas-liquid mixer; 10-2, second gas-liquid mixer; 11-1, first pressure sensor; 11-2, second pressure sensor; 12, leaching column; 13, leaching back pressure valve; 14, online uranium concentration detector; 15, leaching liquid intermediate container; 16, ion exchange column; 17, liquid mass flow controller; 18, thermostat; 19-1, first liquid level sensor; 19-2, second liquid level sensor. DETAILED DESCRIPTION

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] The purpose of this invention is to provide a simulated in-situ leaching uranium extraction cycle experimental device to solve the problems existing in the prior art and improve the reliability, usability, and accuracy of the results of in-situ leaching uranium extraction simulation experiments.

[0037] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] like Figs. 1-2 As shown, this embodiment provides a simulated in-situ uranium extraction cycle experimental device, including a liquid injection component, a gas source inlet component, a gas-liquid mixing component, a leaching component, an adsorption component, a temperature control component, and an automatic control unit.

[0039] The liquid injection assembly includes an intermediate leaching agent container 7 and an injection pump 8, with the inlet of the injection pump 8 connected to the outlet of the intermediate leaching agent container 7. A first liquid level sensor 19-1 is installed on the intermediate leaching agent container 7. The injection pump 8 is a horizontal flow pump with a flow rate range of 0.001-9.999 ml / min.

[0040] The gas source intake assembly includes a carbon dioxide intake assembly and an oxygen intake assembly. The carbon dioxide intake assembly includes a carbon dioxide cylinder 1, the outlet of which is connected to the inlet of a first gas disperser 9-1 via a pipeline. Along the pipeline connecting the outlet of carbon dioxide cylinder 1 to the first gas disperser 9-1, a first high-pressure reducing valve 3-1, a first shut-off valve 4-1, a first gas mass flow controller 5-1, and a first check valve 6-1 are sequentially arranged in the direction away from carbon dioxide cylinder 1. The oxygen intake assembly includes an oxygen cylinder 2, the outlet of which is connected to the inlet of a second gas disperser 9-2 via a pipeline. Along the pipeline connecting the outlet of oxygen cylinder 2 to the second gas disperser 9-2, along the direction away from oxygen cylinder 2, a second high-pressure reducing valve 3-2, a second shut-off valve 4-2, a second gas mass flow controller 5-2, and a second check valve 6-2 are sequentially arranged in the direction away from oxygen cylinder 2.

[0041] Both the first gas mass flow controller 5-1 and the second gas mass flow controller 5-2 use thermal mass flow controllers or differential pressure laminar flow mass flow controllers to measure carbon dioxide and oxygen, with a flow range of 0.005-0.200 ml / min. The inlet and outlet pressure difference of the first gas mass flow controller 5-1 and the inlet and outlet pressure difference of the second gas mass flow controller 5-2 are both 0.01-0.50 MPa.

[0042] The gas-liquid mixing assembly includes a first mixing assembly and a second mixing assembly. The first mixing assembly includes a first gas disperser 9-1 and a first gas-liquid mixer 10-1. The first gas disperser 9-1 is disposed inside the first gas-liquid mixer 10-1, and its inlet is located at the inlet of the first gas-liquid mixer 10-1. The liquid inlet of the first gas-liquid mixer 10-1 is connected to the outlet of the injection pump 8. The outlet of the carbon dioxide cylinder 1 is connected to the inlet of the first gas disperser 9-1. The second mixing assembly... The assembly includes a second gas disperser 9-2 and a second gas-liquid mixer 10-2. The second gas disperser 9-2 is disposed inside the second gas-liquid mixer 10-2, and its inlet is located at the inlet of the second gas-liquid mixer 10-2. The liquid inlet of the second gas-liquid mixer 10-2 is connected to the liquid outlet of the first gas-liquid mixer 10-1. The outlet of the oxygen cylinder 2 is connected to the inlet of the second gas disperser 9-2. The liquid outlet of the second gas-liquid mixer 10-2 is connected to the leaching assembly. Both the first gas disperser 9-1 and the second gas disperser 9-2 are columnar nozzles pressed by powder metallurgy, with an orifice diameter of 1-5 μm. Both the first gas-liquid mixer 10-1 and the second gas-liquid mixer 10-2 are Venturi jet mixers or SV-type static mixers.

[0043] Carbon dioxide, after being metered by the carbon dioxide inlet assembly, enters the first gas-liquid mixer 10-1 through the first gas disperser 9-1. In the first gas-liquid mixer 10-1, carbon dioxide gas and the leaching liquid are mixed. The function of the first gas disperser 9-1 is to disperse the carbon dioxide gas as evenly as possible before mixing it with the leaching liquid in the first gas-liquid mixer 10-1. Oxygen, after being metered by the gas source inlet assembly, enters the second gas-liquid mixer 10-2 through the second gas disperser 9-2. In the second gas-liquid mixer 10-2, oxygen gas and the leaching liquid are mixed. The function of the second gas disperser 9-2 is to disperse the oxygen gas as evenly as possible before mixing it with the leaching liquid in the second gas-liquid mixer 10-2. The leaching agent, after being mixed in two stages—carbon dioxide mixing and oxygen mixing—enters the leaching assembly for leaching.

[0044] The leaching assembly comprises a first pressure sensor 11-1, a second pressure sensor 11-2, a leaching back pressure valve 13, an online uranium concentration detector 14 and at least one leaching column 12. The first pressure sensor 11-1 is arranged on a communication pipeline between the liquid inlet of the leaching column 12 and the liquid outlet of the second gas-liquid mixer 10-2. The second pressure sensor 11-2, the leaching back pressure valve 13 and the online uranium concentration detector 14 are sequentially arranged on a communication pipeline between the liquid outlet of the leaching assembly and the liquid inlet of the leaching liquid intermediate container 15 in a direction gradually away from the leaching assembly, wherein the leaching back pressure valve 13 is located between the second pressure sensor 11-2 and the online uranium concentration detector 14, the online uranium concentration detector 14 is closer to the leaching liquid intermediate container 15 than the leaching back pressure valve 13, and the second pressure sensor 11-2 is closer to the leaching column 12 than the leaching back pressure valve 13.

[0045] It should be noted that when the number of leaching columns 12 is at least two, all the leaching columns 12 are connected in series. The leaching column 12 adopts a sand-filled pipe or a full-diameter core holder, and the liquid inlet of the leaching column 12 is communicated with the liquid outlet of the second gas-liquid mixer 10-2.

[0046] The adsorption assembly comprises the leaching liquid intermediate container 15 and the ion exchange column 16, and the liquid outlet of the leaching column 12 is communicated with the liquid inlet of the leaching liquid intermediate container 15; the liquid inlet of the ion exchange column 16 is communicated with the liquid outlet of the leaching liquid intermediate container 15, and the liquid outlet of the ion exchange column 16 is communicated with the liquid inlet of the leaching agent intermediate container 7.

[0047] A liquid mass flow controller 17 is arranged on the communication pipeline between the liquid outlet of the ion exchange column 16 and the liquid inlet of the leaching agent intermediate container 7; and a second liquid level sensor 19-2 is arranged on the leaching liquid intermediate container 15. The liquid mass flow controller 17 adopts a Coriolis mass flow controller or a differential pressure laminar flow controller, and the flow range is 0.001-9.999 mL / min. The inner diameter of the ion exchange column 16 is ≤1 cm, and the volume is 10-20 mL.

[0048] The leaching agent intermediate container 7 and the leaching liquid intermediate container 15 are both columnar containers with a bottom end in an inverted conical shape, and the inner diameter of the columnar part of the columnar container is 1-2 cm, and the volume of the columnar container is 10-20 mL; the liquid outlets of the leaching agent intermediate container 7 and the leaching liquid intermediate container 15 are arranged at the bottom end; the linkage cooperation of the liquid mass flow controller 17 and the first liquid level sensor 19-1 can realize the metering and control of the solution liquid level in the leaching agent intermediate container 7, and the solution liquid level in the leaching liquid intermediate container 15 is detected by the second liquid level sensor 19-2.

[0049] In the embodiment, the leaching column 12 adopts sand-packed tube or full-diameter core holder; in the experiment, 6 leaching columns 12 can be connected in series, and the specific number of the leaching columns 12 connected in series can be adaptively adjusted according to actual needs. It should be noted that the leaching columns 12 connected in series as a whole are taken as a leaching unit, and the leaching unit as a whole is in communication with the liquid inlet of the second gas-liquid mixer 10-2 and the liquid inlet of the online uranium concentration detector 14.

[0050] The automatic control unit includes a computer, and the first gas mass flow controller 5-1, the second gas mass flow controller 5-2, the first pressure sensor 11-1, the second pressure sensor 11-2, the first liquid level sensor 19-1, the second liquid level sensor 19-2, the liquid injection pump 8, the liquid mass flow controller 17 and the online uranium concentration detector 14 are respectively in signal connection with the computer.

[0051] The temperature control assembly includes a thermostat 18, and the leaching agent intermediate container 7, the first gas-liquid mixer 10-1, the second gas-liquid mixer 10-2, the leaching column 12, the leaching back pressure valve 13, the leaching liquid intermediate container 15 and the ion exchange column 16 are all arranged in the thermostat 18. The temperature control assembly is in signal connection with the computer.

[0052] The use method of the simulated in-situ leaching uranium extraction circulation experiment device in the embodiment is as follows:

[0053] When starting the experiment, the formation water is added to the leaching agent intermediate container 7, the liquid injection pump 8 is started to pressurize the formation water to flow through the first gas-liquid mixer 10-1 and the second gas-liquid mixer 10-2, then through each leaching column 12 in turn, then through the leaching back pressure valve 13, and then detected by the online uranium concentration detector 14, and then dropped into the leaching liquid intermediate container 15, and then from the leaching liquid intermediate container 15 into the ion exchange column 16, and then absorbed and returned to the leaching agent intermediate container 7 by the liquid mass flow controller 17; when the liquid levels in the leaching agent intermediate container 7 and the leaching liquid intermediate container 15 reach the set values, the addition of the formation water is stopped, and the leaching cycle is started.

[0054] When the stable design pressure and flow are reached, the corresponding parameters can be calculated by the computer. When the set cycle number is reached, the gas injection is started.

[0055] Specifically, the carbon dioxide in the carbon dioxide cylinder 1 flows into the first gas-liquid mixer 10-1 through the first high-pressure pressure-reducing valve 3-1, the first stop valve 4-1, the first gas mass flow controller 5-1, the first one-way valve 6-1 and the first gas disperser 9-1, and the carbon dioxide is mixed with the formation water in the first gas-liquid mixer 10-1 to form a leaching liquid which flows into the second mixing assembly; the oxygen in the oxygen cylinder 2 flows into the second gas-liquid mixer 10-2 through the second high-pressure pressure-reducing valve 3-2, the second stop valve 4-2, the second gas mass flow controller 5-2, the second one-way valve 6-2 and the second gas disperser 9-2, and the leaching liquid flowing into the second gas-liquid mixer 10-2 is mixed with the oxygen in the second gas-liquid mixer 10-2 to form a lixiviant;

[0056] The ore sample is loaded in each leaching column 12, and the leaching agent after gas-liquid mixing enters the leaching column 12 in sequence for leaching, and the leaching liquid after leaching flows out of the leaching column 12 stably under the control of the leaching back pressure valve 13, simulates the formation pressure and controls the oxygen in the leaching agent from being precipitated; after the leaching liquid flows out of the leaching column 12, the uranium concentration is detected by the online uranium concentration detector 14, and then dripped into the leaching liquid intermediate container 15, and then enters the ion exchange column 16 from the leaching liquid intermediate container 15, and flows back to the leaching agent intermediate container 7 after adsorption under the control of the liquid mass flow controller 17.

[0057] The experimental data are collected by the data collector and the computer throughout the experiment, the liquid injection amount, the liquid flow rate flowing back to the leaching agent intermediate container 7 and the gas addition amount are automatically controlled by the computer, the liquid levels of the leaching agent intermediate container 7 and the leaching liquid intermediate container 15 are maintained at the set liquid levels, and the parameters such as the permeability, the uranium concentration and the leaching rate of the leaching column 12 are automatically calculated by the set program of the computer, so that the automatic control of the whole process of leaching and adsorption is realized.

[0058] In the description of the present application, it should be noted that the terms “first” and “second” are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0059] In the present application, specific examples are applied to describe the principles and implementation modes of the present application, and the above examples are only used to help understand the method and core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation modes and application ranges can be changed. In conclusion, the content of the present application should not be understood as a limitation of the present application.

Claims

1. A simulated in-situ uranium extraction cycle experimental apparatus, characterized in that, It includes a liquid injection assembly, a gas source intake assembly, a gas-liquid mixing assembly, a leaching assembly, and an adsorption assembly; The liquid injection assembly includes a leachate intermediate container and a liquid injection pump, with the inlet of the liquid injection pump connected to the outlet of the leachate intermediate container; the gas source intake assembly includes a carbon dioxide intake assembly and an oxygen intake assembly, the carbon dioxide intake assembly including a first gas mass flow controller, and the oxygen intake assembly including a second gas mass flow controller; the gas-liquid mixing assembly includes a first mixing assembly and a second mixing assembly, the first mixing assembly including a first gas disperser and a first gas-liquid mixer, the first gas disperser being disposed within the first gas-liquid mixer, and the outlet of the liquid injection pump connected to the inlet of the first gas-liquid mixer, the second mixing assembly including a second gas disperser and a second gas-liquid mixer. The second gas disperser is disposed within the second gas-liquid mixer. The inlet of the second gas-liquid mixer is connected to the outlet of the first gas-liquid mixer. The outlet of the carbon dioxide inlet assembly is connected to the inlet of the first gas disperser. The outlet of the oxygen inlet assembly is connected to the inlet of the second gas disperser. The outlet of the second gas-liquid mixer is connected to the leaching assembly. The adsorption assembly includes an intermediate leachate container and an ion exchange column. The inlet of the intermediate leachate container is connected to the outlet of the leaching assembly. The inlet of the ion exchange column is connected to the outlet of the intermediate leachate container, and the outlet of the ion exchange column is connected to the inlet of the intermediate leachate container.

2. The simulated in-situ uranium extraction cycle experimental apparatus according to claim 1, characterized in that: The first gas mass flow controller and the second gas mass flow controller are thermal mass flow controllers or differential pressure laminar flow mass flow controllers; the flow range of the first gas mass flow controller and the second gas mass flow controller is 0.005-0.200 ml / min; the inlet and outlet pressure difference of the first gas mass flow controller and the inlet and outlet pressure difference of the second gas mass flow controller are both 0.01-0.50 MPa.

3. The simulated in-situ uranium extraction cycle experimental apparatus according to claim 1, characterized in that: The carbon dioxide inlet assembly includes a carbon dioxide cylinder, the outlet of which is connected to the inlet of the first gas disperser via a pipeline; a first gas mass flow controller is installed on the pipeline connecting the outlet of the carbon dioxide cylinder and the first gas disperser, and a first high-pressure reducing valve, a first shut-off valve, and a first one-way valve are also installed on the pipeline connecting the outlet of the carbon dioxide cylinder and the first gas disperser; the oxygen inlet assembly includes an oxygen cylinder, the outlet of which is connected to the inlet of the second gas disperser via a pipeline; a second gas mass flow controller is installed on the pipeline connecting the outlet of the oxygen cylinder and the second gas disperser, and a second high-pressure reducing valve, a second shut-off valve, and a second one-way valve are also installed on the pipeline connecting the outlet of the oxygen cylinder and the second gas disperser.

4. The simulated in-situ uranium extraction cycle experimental apparatus according to claim 1, characterized in that: The leaching assembly includes at least one leaching column, and when there are at least two leaching columns, all of the leaching columns are connected in series; the leaching column is a sand-filled pipe or a full-diameter core holder.

5. The simulated in-situ uranium extraction cycle experimental apparatus according to claim 4, characterized in that: The leaching assembly further includes a first pressure sensor, a second pressure sensor, a leaching back pressure valve, and an online uranium concentration detector; the first pressure sensor is disposed on the connecting pipe between the inlet of the leaching assembly and the outlet of the second gas-liquid mixer, and the second pressure sensor, the leaching back pressure valve, and the online uranium concentration detector are sequentially disposed on the connecting pipe between the outlet of the leaching assembly and the inlet of the intermediate leaching container in a direction gradually moving away from the leaching assembly.

6. The simulated in-situ uranium extraction cycle experimental apparatus according to claim 5, characterized in that: Both the intermediate container for the leaching agent and the intermediate container for the leaching liquid are cylindrical containers with an inverted conical bottom. The inner diameter of the cylindrical portion of the cylindrical container is 1-2 cm, and the volume of the cylindrical container is 10-20 mL. A first liquid level sensor is installed on the intermediate container for the leaching agent, and a second liquid level sensor is installed on the intermediate container for the leaching liquid.

7. The simulated in-situ uranium extraction cycle experimental apparatus according to claim 6, characterized in that: A liquid mass flow controller is installed on the connecting pipe between the outlet of the ion exchange column and the inlet of the leaching agent intermediate container; the inner diameter of the ion exchange column is ≤1cm and the volume is 10-20mL; the liquid mass flow controller is a Coriolis mass flow controller or a differential pressure laminar flow controller, and the flow rate is 0.001-9.999mL / min.

8. The simulated in-situ uranium extraction cycle experimental apparatus according to claim 7, characterized in that: It also includes an automatic control unit, which includes a computer. The first gas mass flow controller, the second gas mass flow controller, the first pressure sensor, the second pressure sensor, the first liquid level sensor, the second liquid level sensor, the injection pump, the liquid mass flow controller, and the online uranium concentration detector are respectively connected to the computer via signal connection.

9. The simulated in-situ uranium extraction cycle experimental apparatus according to claim 8, characterized in that: It also includes a temperature control component, which includes a constant temperature chamber. The intermediate container for the leaching agent, the first gas-liquid mixer, the second gas-liquid mixer, the leaching component, and the adsorption component are all disposed inside the constant temperature chamber. The temperature control component is connected to the computer signal.

10. The simulated in-situ uranium extraction cycle experimental apparatus according to claim 1, characterized in that: Both the first gas disperser and the second gas disperser are columnar nozzles pressed by powder metallurgy, with an orifice diameter of 1-5 μm; both the first gas-liquid mixer and the second gas-liquid mixer are Venturi jet mixers or SV static mixers; the leaching liquid enters the first gas-liquid mixer from the inlet, and carbon dioxide first enters the first gas disperser and then flows out of the first gas disperser to mix with the liquid in the first gas-liquid mixer; the leaching liquid enters the second gas-liquid mixer from the inlet, and oxygen first enters the second gas disperser and then flows out of the second gas disperser to mix with the leaching liquid in the second gas-liquid mixer.

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