阅读说明：本技术 砂岩铀矿水平井地浸开采模拟试验系统及试验方法 (Sandstone uranium ore horizontal well ground immersion exploitation simulation test system and test method ) 是由 常江芳 王伟 苏学斌 周根茂 牛庆合 李召坤 刘佳佳 袁维 闻磊 于 2020-12-21 设计创作，主要内容包括：本发明提供了一种砂岩铀矿水平井地浸开采模拟试验系统及试验方法,属于砂岩铀矿地浸开采技术领域,包括溶浸装置、注液装置、抽液装置和采集监测装置,模拟了砂岩铀矿水平井地浸开采过程,通过注液装置向溶浸装置的水平井内注入浸出剂,浸出剂浸入到矿体材料内并与铀发生化学反应,通过抽液装置将反应后的浸出剂通过直井抽出,采集监测装置采集水平井沿程孔隙水压力和监测反应后浸出剂中铀浓度。本发明提供的砂岩铀矿水平井地浸开采模拟试验系统及试验方法,可采用水平井注液、直井抽液的方式开采铀矿,为探索水平井地浸开采中浸出剂配比、抽注液量对地浸效果的影响、掌握溶浸液渗流规律、优化布井方案、提高铀资源采收率有指导意义。(The invention provides a sandstone uranium ore horizontal well in-situ leaching simulation test system and a test method, which belong to the technical field of sandstone uranium ore in-situ leaching, and comprise a leaching device, a liquid injection device, a liquid extraction device and an acquisition and monitoring device, wherein the leaching process of the sandstone uranium ore in-situ leaching is simulated, a leaching agent is injected into a horizontal well of the leaching device through the liquid injection device, the leaching agent is immersed into an ore body material and chemically reacts with uranium, the reacted leaching agent is extracted through a straight well through the liquid extraction device, and the acquisition and monitoring device acquires the on-way pore water pressure of the horizontal well and monitors the uranium concentration in the leaching agent after the reaction. The simulation test system and the test method for horizontal well in-situ leaching exploitation of sandstone uranium ores can exploit uranium ores by adopting a horizontal well liquid injection and vertical well liquid extraction mode, and have guiding significance for exploring the influence of the proportion of leaching agents and the amount of liquid injection on the in-situ leaching effect in horizontal well in-situ leaching exploitation, mastering the leaching solution seepage rule, optimizing a well arrangement scheme and improving the uranium resource recovery ratio.)

1. Sandstone uranium deposit horizontal well ground flooding mining simulation test system, its characterized in that includes:

the leaching device comprises an ore body material of a uranium-bearing ore aquifer, a horizontal well and a vertical well, wherein the horizontal well is arranged in the ore body material in a horizontal shape, the vertical well is arranged in a vertical shape, a plurality of monitoring holes are distributed in the horizontal well along the way, one end of the horizontal well is opened, the other end of the horizontal well is closed, and the ore body material leaks out from the opening end of the horizontal well and the top end of the vertical well;

the liquid injection device is communicated with the open end of the horizontal well and is used for injecting a leaching agent into the horizontal well, and leaching liquid is soaked into the ore body material through the horizontal well;

the liquid extraction device is communicated with the top end of the vertical well and is used for extracting a leaching agent which is positioned in the ore body material and reacts with uranium through the vertical well; and

and the acquisition monitoring device is used for acquiring the on-way pore water pressure of the horizontal well in the ore body material through the plurality of monitoring holes and monitoring the uranium concentration in the leaching agent pumped out by the liquid pumping device.

2. The sandstone uranium mine horizontal well in-situ leaching simulation test system of claim 1, wherein the leaching device further comprises a box body with an opening at the upper end and capable of seeing the internal structure, the ore body material is arranged in the box body, and filters for filtering sand are arranged in the horizontal well and the vertical well.

3. The sandstone uranium deposit horizontal well land dip production simulation test system of claim 1, wherein the liquid injection device comprises:

a liquid distribution tank for containing the leaching agent;

the two ends of the liquid injection pipeline are respectively communicated with the liquid distribution box and the open end of the horizontal well and used for conveying a leaching agent into the horizontal well; and

and the liquid injection pump is arranged on the liquid injection pipeline and used for pumping the leaching agent into the horizontal well.

4. The sandstone uranium ore horizontal well ground leaching simulation test system of claim 3, wherein the injection device further comprises a first flow meter and a first pressure gauge which are arranged on the injection pipeline, the first flow meter is used for monitoring the injection flow rate of the leaching agent in the injection pipeline, and the first pressure gauge is used for monitoring the injection pressure of the leaching agent in the injection pipeline.

5. The sandstone uranium deposit horizontal well ground leaching simulation test system of claim 3, wherein the liquid injection device further comprises a stirrer arranged in the liquid distribution box, and the stirrer is used for stirring liquid in the liquid distribution box.

6. The sandstone uranium deposit horizontal well ground leaching simulation test system of claim 1, wherein the pumping device comprises:

a liquid collection tank for containing a leaching agent that reacts with uranium within the ore body material;

the two ends of the liquid pumping pipeline are respectively communicated with the top end of the vertical shaft and the liquid collecting pool and are used for conveying a leaching agent for reaction into the liquid collecting pool; and

and the liquid pumping pump is arranged on the liquid pumping pipeline and is used for pumping out the leaching agent which is reacted with the uranium in the ore body material.

7. The sandstone uranium ore horizontal well ground leaching simulation test system of claim 6, wherein the liquid pumping pipeline is further provided with a second flow meter and a second pressure gauge, the second flow meter is used for monitoring the leaching agent pumping flow rate in the liquid pumping pipeline, the second pressure gauge is used for monitoring the leaching agent pumping pressure in the liquid pumping pipeline, and the liquid pumping device further comprises a back pressure valve arranged on the liquid pumping pipeline.

8. The sandstone uranium deposit horizontal well land leaching production simulation test system of claim 1, wherein the collection monitoring device comprises:

the pressure sensors are arranged in the monitoring holes and used for acquiring the on-way pore water pressure of the horizontal well in the ore body material;

the uranium concentration monitor is used for monitoring the uranium concentration in the leaching agent pumped by the liquid pumping device; and

and the computer is respectively electrically connected with the pressure sensors and the uranium concentration monitor and is used for receiving a plurality of pressure signals of the pressure sensors and receiving concentration signals of the uranium concentration monitor and displaying the signals.

9. The sandstone uranium ore horizontal well ground leaching simulation test system of claim 2, wherein water baffles are arranged on the upper part and the lower part of the ore body material.

10. The sandstone uranium ore horizontal well ground leaching production simulation test method is characterized by comprising the following steps:

arranging ore body materials in the box body, arranging water-stop plates at the upper part and the lower part of the ore body materials, arranging a horizontal well along the horizontal direction of the ore body materials and a plurality of vertical wells along the vertical direction, and arranging a plurality of monitoring holes on the ore body materials along the horizontal well;

enabling the liquid injection device to be communicated with one end of the horizontal well, injecting a leaching agent into the horizontal well through the liquid injection device, and enabling the leaching agent to penetrate into the ore body material and react with uranium in the ore body material;

the liquid extraction device is communicated with the upper end of the vertical well, and the leaching agent which is positioned in the ore body material and reacts with the uranium is extracted through the liquid extraction device, so that the extracted leaching agent is contained in the container;

and collecting the on-way pore water pressure of a horizontal well in a monitoring hole in the ore body material and monitoring the uranium concentration of the leaching agent in the container pumped out by the liquid pumping device by the collecting and monitoring device.

Technical Field

The invention belongs to the technical field of sandstone uranium ore ground immersion mining, and particularly relates to a sandstone uranium ore horizontal well ground immersion mining simulation test system and a test method.

Background

The natural uranium is an important energy source for nuclear power and nuclear military industry in China, and the key for filling up the huge gap of the uranium resources in China is to increase the development strength of the uranium resources and improve the exploitation efficiency of the uranium resources. At present, uranium ore resources in China are mainly sandstone reservoirs, and are mostly mined by using an in-situ leaching process. The ground leaching mining is an integrated uranium mining method which dissolves uranium in ores under the condition of natural burial by means of a chemical reagent through a drilling project and does not cause displacement of the ores. In the whole mining process, the mining and smelting process of the uranium ores is safe, green and environment-friendly because the earth surface operation and control in the whole process are not needed to cut tunnels or uncover covering layers to extract and transport the ores, and the landform and the earth surface landscape are basically not damaged.

The ground immersion exploitation efficiency is directly related to a drilling mode, a grid mode (four-point mode, five-point mode or seven-point mode) or a determinant mode (single line or multiple lines along the direction of an ore body) of straight well liquid injection and straight well liquid extraction is mostly adopted in a traditional well arrangement mode, but the return on investment of a straight well pattern is remarkably reduced along with the increase of development depth and difficulty. And the mode of horizontal well liquid injection and vertical well liquid extraction is theoretically more advantageous. However, the related research on exploitation of horizontal well liquid injection and vertical well liquid extraction modes is relatively few, and the laboratory physical model test is still lacked. Based on the situation, a sandstone uranium ore horizontal well ground leaching production simulation test system is urgently needed, is used for simulating the modes of horizontal well liquid injection and vertical well liquid extraction, provides reference for engineering practice, and has important guiding significance for exploring the influence of the proportion of a leaching agent and the amount of the liquid to be extracted and injected on the ground leaching effect in horizontal well ground leaching production, mastering the seepage rule of the leaching solution, optimizing a well arrangement scheme and improving the recovery ratio of uranium resources.

Disclosure of Invention

The invention aims to provide a sandstone uranium ore horizontal well ground leaching exploitation simulation test system, and aims to solve the technical problem of lacking research on sandstone uranium ore horizontal well ground leaching exploitation physical simulation tests.

In order to achieve the purpose, the invention adopts the technical scheme that: the sandstone uranium ore horizontal well ground leaching production simulation test system comprises a leaching device, a liquid injection device, a liquid extraction device and a collection monitoring device, wherein the leaching device comprises an ore body material of a uranium ore aquifer, a horizontal well and a vertical well, the horizontal well is arranged in the ore body material in a horizontal shape, the vertical well is arranged in a vertical shape, a plurality of monitoring holes are distributed in the horizontal well along the way, one end of the horizontal well is opened, the other end of the horizontal well is closed, and the ore body material leaks from the open end of the horizontal well and the top end of the vertical well; the liquid injection device is communicated with the open end of the horizontal well and is used for injecting a leaching agent into the horizontal well, and the leaching liquid is immersed into the ore body material through the horizontal well; the liquid extraction device is communicated with the top end of the vertical well and is used for extracting a leaching agent which is positioned in the ore body material and reacts with uranium through the vertical well; and the acquisition monitoring device is used for acquiring the on-way pore water pressure of the horizontal well in the ore body material through the plurality of monitoring holes and monitoring the uranium concentration in the leaching agent pumped out by the liquid pumping device.

As another embodiment of the application, the leaching device further comprises a box body with a perspective internal structure and an open upper end, the ore body material is arranged in the box body, and filters for filtering sand are arranged in the horizontal well and the vertical well.

As another embodiment of the application, the liquid injection device comprises a liquid distribution box, a liquid injection pipeline and a liquid injection pump, wherein the liquid distribution box is used for containing the leaching agent; two ends of the liquid injection pipeline are respectively communicated with the liquid distribution box and the open end of the horizontal well and used for conveying a leaching agent into the horizontal well; and the liquid injection pump is arranged on the liquid injection pipeline and used for pumping the leaching agent into the horizontal well.

As another embodiment of this application, priming device is still including locating first flowmeter and first manometer on the notes liquid pipeline, first flowmeter is used for the monitoring leach the agent in the notes liquid pipeline and annotate liquid flow, first manometer is used for the monitoring leach the agent pressure of annotating in the notes liquid pipeline.

As another embodiment of the application, the liquid injection device further comprises a stirrer arranged in the liquid distribution box, and the stirrer is used for stirring and placing liquid in the liquid distribution box.

As another embodiment of the present application, the liquid pumping device comprises a liquid collecting tank, a liquid pumping pipeline and a liquid pumping pump, wherein the liquid collecting tank is used for accommodating a leaching agent which reacts with uranium in the ore body material; two ends of the liquid pumping pipeline are respectively communicated with the top end of the vertical shaft and the liquid collecting pool and are used for conveying a leaching agent for reaction into the liquid collecting pool; the liquid pumping pump is arranged on the liquid pumping pipeline and is used for pumping out the leaching agent which is reacted with the uranium in the ore body material; the liquid pumping device further comprises a back pressure valve arranged on the liquid pumping pipeline.

As another embodiment of this application, still be equipped with second flowmeter and second manometer on the liquid suction pipeline, the second flowmeter is used for monitoring leachant drawing liquid flow in the liquid suction pipeline, the second manometer is used for monitoring leachant drawing liquid pressure in the liquid suction pipeline.

As another embodiment of the application, the collecting and monitoring device comprises a plurality of pressure sensors, a uranium concentration monitor and a computer, wherein the plurality of pressure sensors are arranged in the plurality of monitoring holes and used for collecting the on-way pore water pressure of the horizontal well in the ore body material; the uranium concentration monitor is used for monitoring the uranium concentration in the leaching agent pumped out by the liquid pumping device; and the computer is respectively electrically connected with the pressure sensors and the uranium concentration monitor and is used for receiving a plurality of pressure signals of the pressure sensors and receiving concentration signals of the uranium concentration monitor and displaying the signals.

As another embodiment of the present application, the upper and lower portions of the ore body material are provided with water-stop sheets.

The invention also provides a sandstone uranium ore horizontal well ground leaching exploitation simulation test method, which comprises the following steps:

arranging ore body materials in the box body, arranging water-stop plates at the upper part and the lower part of the ore body materials, arranging a horizontal well along the horizontal direction of the ore body materials and a plurality of vertical wells along the vertical direction, and arranging a plurality of monitoring holes on the ore body materials along the horizontal well;

enabling the liquid injection device to be communicated with one end of the horizontal well, injecting a leaching agent into the horizontal well through the liquid injection device, and enabling the leaching agent to penetrate into the ore body material and react with uranium in the ore body material;

the liquid extraction device is communicated with the upper end of the vertical well, and the leaching agent which is positioned in the ore body material and reacts with the uranium is extracted through the liquid extraction device, so that the extracted leaching agent is contained in the container;

and collecting the on-way pore water pressure of a horizontal well in a monitoring hole in the ore body material and monitoring the uranium concentration of the leaching agent in the container pumped out by the liquid pumping device by the collecting and monitoring device.

The sandstone uranium ore horizontal well ground immersion exploitation simulation test system and the test method provided by the invention have the beneficial effects that: compared with the prior art, the sandstone uranium ore horizontal well in-situ leaching simulation test system simulates the sandstone uranium ore horizontal well in-situ leaching process, the horizontal well and the vertical well are arranged in the ore body material of the ore-containing aquifer of the leaching device, the plurality of monitoring holes are distributed along the horizontal well in the process, the leaching agent is injected into the horizontal well through the liquid injection device, the leaching agent is immersed into the ore body material and chemically reacts with uranium, the reacted leaching agent is extracted through the vertical well through the liquid extraction device, the in-situ pore water pressure of the horizontal well and the uranium concentration in the reacted leaching agent can be collected through the collection monitoring device, the technical problem of shortage in research of sandstone ore horizontal well in-situ leaching physical simulation test is solved, the injection liquid extraction mode of the horizontal well and the vertical well can be adopted to extract uranium ore through the sandstone ore horizontal well in-situ leaching physical simulation test, and reference is provided for engineering practice, the method has important guiding significance for exploring the influence of the proportioning of the leaching agent and the amount of the pumping and injection liquid on the ground leaching effect in the ground leaching exploitation of the horizontal well, mastering the seepage rule of the leaching solution, optimizing the well arrangement scheme and improving the recovery ratio of uranium resources.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a sandstone uranium ore horizontal well leaching and mining simulation test system provided by an embodiment of the invention;

fig. 2 is a plan view of a monitoring hole arrangement structure of a sandstone uranium ore horizontal well leaching and mining simulation test system provided by the embodiment of the invention;

fig. 3 is a schematic structural diagram of a filter of a sandstone uranium ore horizontal well leaching and mining simulation test system provided by the embodiment of the invention.

In the figure: 1. a leaching apparatus; 11. an ore body material; 12. horizontal wells; 13. a vertical well; 14. a monitoring hole; 15. a box body; 16. a filter; 17. a water-stop sheet;

2. a liquid injection device; 21. a liquid distribution box; 22. a liquid injection pipeline; 23. a liquid injection pump; 24. a first flow meter; 25. a first pressure gauge; 26. a stirrer;

3. a liquid pumping device; 31. a liquid collecting tank; 32. a liquid pumping pipeline; 33. a liquid pump; 34. a second flow meter; 35. a second pressure gauge; 36. a back pressure valve;

4. collecting and monitoring devices; 41. a pressure sensor; 42. a uranium concentration monitor; 43. and (4) a computer.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to fig. 3 together, a simulation test system for horizontal-well horizontal-land leaching exploitation of sandstone uranium ore provided by the invention will be described. The sandstone uranium ore horizontal well ground leaching production simulation test system comprises a leaching device 1, a liquid injection device 2, a liquid extraction device 3 and a collection monitoring device 4, wherein the leaching device 1 comprises an ore body material 11 of a uranium ore aquifer, a horizontal well 12 and a vertical well 13, the horizontal well 12 is arranged in the ore body material 11 in a horizontal shape, the vertical well 13 is arranged in a vertical shape, a plurality of monitoring holes 14 are distributed in the horizontal well 12 along the way, one end of the horizontal well 12 is opened, the other end of the horizontal well is closed, and the ore body material 11 leaks out of the opening end of the horizontal well 12 and the top end of the vertical well 13; the liquid injection device 2 is communicated with the open end of the horizontal well 12 and is used for injecting a leaching agent into the horizontal well 12, and leaching liquid is soaked into the ore body material 11 through the horizontal well 12; the liquid extraction device 3 is communicated with the top end of the vertical well 13 and is used for extracting a leaching agent which is positioned in the ore body material 11 and reacts with uranium through the vertical well 13; the acquisition monitoring device 4 is used for acquiring the on-way pore water pressure of the horizontal well 12 in the ore body material 11 through a plurality of monitoring holes 14 and monitoring the uranium concentration in the leaching agent pumped out by the liquid pumping device 3.

Compared with the prior art, the sandstone uranium ore horizontal well in-situ leaching simulation test system provided by the invention simulates the process of the sandstone uranium ore horizontal well 12 in-situ leaching, the horizontal well 12 and the vertical well 13 are arranged in the ore-containing aquifer ore body material 11 of the leaching device 1, a plurality of monitoring holes 14 are distributed along the horizontal well 12, the leaching agent is injected into the horizontal well 12 through the injection device 2, so that the leaching agent is immersed into the ore body material 11 and chemically reacts with uranium, the reacted leaching agent is pumped out through the vertical well 13 through the liquid pumping device 3, the water pressure and the pore pressure of the horizontal well 12 along the way and the uranium concentration in the leached agent after the reaction can be collected through the collection monitoring device 4, the technical problem of lacking in research of the sandstone uranium ore horizontal well 12 in-situ leaching physical simulation test is solved, and the sandstone uranium ore horizontal well 12 in-situ leaching physical simulation test system is physically simulated, the uranium ore can be mined by adopting a horizontal well 12 liquid injection mode and a vertical well 13 liquid extraction mode, reference is provided for engineering practice, and important guiding significance is provided for exploring the influence of the leaching agent proportion and the liquid injection amount on the ground leaching effect in the horizontal well 12 ground leaching mining, mastering the leaching liquid seepage rule, optimizing a well arrangement scheme and improving the uranium resource recovery ratio.

Before the simulation test is started, preparing a container, putting clean water into the container, and cleaning the ore bed of the ore body material 11 by the clean water through a liquid injection device 2; preparing a sulfuric acid solution and water in a container, mixing the sulfuric acid solution and the water to complete the preparation, and injecting the acid solution into an ore bed (an ore-containing aquifer) through an injection device 2 for acidizing the ore bed; finally, H is added into the container₂O₂The oxidant is injected into the interior of the ore bed through the liquid injection device 2, and the simulated leaching process is started.

The invention establishes a sandstone uranium ore horizontal well 12-place leaching exploitation simulation experiment device which is used for simulating the whole process from drilling, liquid injection, leaching solution seepage migration, chemical reaction with ores to liquid extraction place leaching exploitation, and can monitor the pressure and flow of the leaching solution, the ion component change of the leaching solution, the leaching range, the permeability of an ore layer, the pore structure change of the ore layer, the uranium concentration of the leaching solution and other information in real time in the whole process.

The monitoring holes 14 are arranged in a way along the horizontal well 12, such as the arrangement of the monitoring holes 14 from 1# -14# in fig. 2. The arrangement of the monitoring holes 14 and the vertical wells 13 adopts a staggered arrangement, and after the top of the vertical well 13 is connected with the liquid pumping device 3, the top of the vertical well 13 is sealed by sealing materials. Through the arrangement of the monitoring holes 14, the monitoring holes 14 are arranged at certain intervals, so that the hydraulic pressure drop effect of the horizontal well 12 along the way can be monitored, and the seepage range, the pore pressure change in an ore bed and the concentration change of leaching solution ions can also be monitored. The horizontal wells 12 are arranged in one, the vertical wells 13 are arranged in a plurality, and the vertical wells 13 are distributed on two sides of the horizontal wells 12.

As a specific embodiment of the horizontal well ground leaching production simulation test system for sandstone uranium ore, please refer to fig. 1 to 3, the leaching device 1 further includes a box body 15 with an open upper end and capable of seeing the internal structure, the ore body material 11 is arranged in the box body 15, and filters 16 for filtering sand are arranged in the horizontal well 12 and the vertical well 13. The top of the box body 15 is provided with an opening, ore body materials 11 can be placed into the box body 15 through the opening, one end of a horizontal well 12 extends out of one side of the box body 15 and can be connected with the output end of the liquid injection device 2, the other end of the horizontal well 12 is buried in the ore body materials 11, the horizontal well 12 is arranged in a horizontal shape, and the arrangement mode of the horizontal well 12 is realized by drilling in the ore body materials 11 through drilling equipment; the arrangement mode of the vertical well 13 is realized by drilling in the ore body material 11 through drilling equipment, the box body 15 is made of toughened transparent glass, the periphery and the bottom are sealed, the top is open, and the seam between the horizontal well 12 and the wall of the box body 15 is tightly sealed through glass cement or sealant.

The ore body material 11 is a mine with actual uranium, the uranium content of an ore bed is determined in advance, and then a simulation test is carried out. Specifically, the filter 16 is a slotted screen pipe filter 16, one end of which is closed and the other end of which is opened, and is sleeved inside the horizontal well 12 and the vertical well 13 to play a role in sand prevention. The horizontal well 12 only simulates the horizontal section of a mine in actual production, and is characterized by reducing the drilling difficulty of horizontal well 12 deflection, well track control and the like.

As a specific embodiment of the sandstone uranium ore horizontal well ground leaching production simulation test system provided by the invention, referring to fig. 1 to 3, a liquid injection device 2 comprises a liquid distribution box 21, a liquid injection pipeline 22 and a liquid injection pump 23, wherein the liquid distribution box 21 is used for containing a leaching agent; two ends of the liquid injection pipeline 22 are respectively communicated with the liquid distribution box 21 and the open end of the horizontal well 12 and used for conveying a leaching agent into the horizontal well 12; the injection pump 23 is arranged on the injection pipeline 22 and used for pumping the leaching agent into the horizontal well 12. Join in marriage liquid case 21 and just to the effect that the leaching agent of pouring into ore body material 11 inside holds and holds, place the leaching agent in joining in marriage liquid case 21, can artifically or electronic stir it, pour into in 23 to horizontal well 12 through the infusion pump after the misce bene, after the leaching agent reachs in the horizontal well 12, effect through infiltration will permeate ore body material 11 in, and carry out chemical reaction with the uranium in ore body material 11, treat a period of time after, extract the leaching agent after reacting with the uranium through drawing liquid device 3, the rethread collection monitoring devices 4 detects the concentration of uranium.

Acid solutions with different concentrations can be arranged in the solution distribution box 21, and the optimal proportion of the leaching agent is found. Valves are provided at the head and tail ends of the injection line 22 so that the flow rate, time, etc. of the leachant to be injected can be controlled. A valve is provided on one side of the liquid distribution tank 21 so that the volume, the amount of liquid to be mixed, and the like in the liquid distribution tank 21 can be controlled.

As a specific embodiment of the sandstone uranium ore horizontal well ground leaching and mining simulation test system provided by the present invention, referring to fig. 1 to 3, the liquid injection device 2 further includes a first flow meter 24 and a first pressure gauge 25 which are arranged on the liquid injection pipeline 22, the first flow meter 24 is configured to monitor a liquid injection flow rate of the leaching agent in the liquid injection pipeline 22, and the first pressure gauge 25 is configured to monitor a liquid injection pressure of the leaching agent in the liquid injection pipeline 22. By adjusting the pressure and flow of injection liquid, the injection pressure and flow of the leaching agent in the actual mine can be simulated, and the theoretical reference basis is taken for the later mining mode of horizontal well 12 injection liquid and vertical well 13 liquid extraction.

Preferably, the first flowmeter 24 and the first pressure gauge 25 can be connected to the collection monitoring device 4, and the liquid injection pressure and the liquid injection amount can be monitored and recorded in real time through the collection monitoring device 4.

As a specific embodiment of the sandstone uranium ore horizontal well ground leaching and mining simulation test system provided by the present invention, referring to fig. 1 to 3, the liquid injection device 2 further includes a stirrer 26 disposed in the liquid distribution tank 21, and the stirrer 26 is configured to stir liquid disposed in the liquid distribution tank 21. The liquid in the liquid preparation tank 21 is uniformly mixed by stirring the whole process of the stirrer 26, and the liquid can be a leaching agent.

As a specific embodiment of the sandstone uranium ore horizontal well ground leaching simulation test system provided by the present invention, referring to fig. 1 to 3, the liquid pumping device 3 includes a liquid collecting tank 31, a liquid pumping pipeline 32 and a liquid pumping pump 33, wherein the liquid collecting tank 31 is used for accommodating a leaching agent that reacts with uranium in the ore body material 11; two ends of the liquid pumping pipeline 32 are respectively communicated with the top end of the vertical shaft 13 and the liquid collecting tank 31 and used for conveying a leaching agent for reaction into the liquid collecting tank 31; the liquid pump 33 is disposed on the liquid pumping pipeline 32 and is used for pumping out the leaching agent reacted with uranium in the ore body material 11. The side part of the liquid collecting tank 31 is provided with a valve, so that the leaching agent can be discharged, and the concentration of uranium can be monitored conveniently after the leaching agent is discharged. Valves are also provided at the head and tail ends of the liquid withdrawal line 32 to control the flow rate and time of the withdrawal liquid (leachant), etc.

As a specific embodiment of the sandstone uranium ore horizontal well ground leaching production simulation test system provided by the present invention, referring to fig. 1 to 3, the liquid pumping pipeline 32 is further provided with a second flow meter 34 and a second pressure gauge 35, the second flow meter 34 is used for monitoring a liquid pumping flow rate of the leaching agent in the liquid pumping pipeline 32, and the second pressure gauge 35 is used for monitoring a liquid pumping pressure of the leaching agent in the liquid pumping pipeline 32. The water pressure and the amount of the liquid drawn in the liquid drawing line 32 are monitored by a second flow meter 34 and a second pressure gauge 35, and the drawn-out leaching agent reaches the liquid collection tank 31.

Preferably, the first flowmeter 24 and the first pressure gauge 25 can be connected to the collection monitoring device 4, and the liquid injection pressure and the liquid injection amount can be monitored and recorded in real time through the collection monitoring device 4.

As a specific embodiment of the sandstone uranium ore horizontal well ground leaching production simulation test system provided by the present invention, referring to fig. 1 to 3, the liquid pumping device 3 further includes a back pressure valve 36 disposed on the liquid pumping pipeline 32. The liquid is pumped by the liquid pump 33, and the back pressure valve 36 adjusts the pumping pressure in the pumping pipeline 32, so that the pressure condition of the mineral seam water can be simulated to simulate the pressure environment of the mineral seam. By adjusting the second pressure gauge 35, the second flowmeter 34 and the back pressure valve 36, the leaching agent proportioning scheme, the injection pressure, the liquid pumping and injecting amount, the well arrangement mode, the filter 16 slot density and other factors can be adjusted.

As a specific embodiment of the horizontal well immersion mining simulation test system for sandstone uranium ore provided by the invention, please refer to fig. 1 to 3, the acquisition and monitoring device 4 comprises a plurality of pressure sensors 41, a uranium concentration monitor 42 and a computer 43, wherein the plurality of pressure sensors 41 are arranged in a plurality of monitoring holes 14 and used for acquiring the pore water pressure of the horizontal well 12 in the ore body material 11 along the way; the uranium concentration monitor 42 is used for monitoring the uranium concentration in the leaching agent pumped by the liquid pumping device 3; the computer 43 is electrically connected to the plurality of pressure sensors 41 and the uranium concentration monitor 42, respectively, and is configured to receive the pressure signals of the plurality of pressure sensors 41 and the concentration signals of the uranium concentration monitor 42, and display the signals. The pressure sensors 41 are respectively arranged inside the monitoring holes 14 such as 1# -14# in fig. 2, the upper ends of the monitoring holes are sealed, the pressure sensors 41 are connected with a computer 43, connecting wires pass through the sealed positions, and the sealing can be sealed by materials such as sealant. A uranium concentration monitor 42 monitors the leachant in or out of the sump 31 and by monitoring the uranium concentration of the leachant at different time intervals, the amount of leached uranium can be calculated on a computer 43 and the amount of uranium remaining and recovery in the seam can be estimated.

The first flowmeter 24, the first pressure gauge 25, the second flowmeter 34 and the second pressure gauge 35 are respectively connected with the computer 43, the liquid injection pressure, the liquid injection flow rate, the liquid extraction pressure and the liquid extraction flow rate can be controlled through the computer 43, and then the pressure and the flow rate of liquid injection and liquid extraction in an actual mine can be simulated, so that the leaching concentration of simulated uranium is consistent with that of the uranium in the actual mine as far as possible, and a theoretical reference basis can be provided for later-stage research. The influence of the liquid injection pressure and the liquid pumping and injecting amount on the ground immersion effect can be analyzed through the computer 43; extracting leaching agent from the monitoring holes 14 from 1# -14# according to a certain time interval, and detecting the pH value (uranium can be dissolved out when the pH value is less than 2) and the concentration change of uranium, Ca2+, Mg2+, CO32-, HCO3-, SO 42-and other ions through a uranium concentration monitor 42 to obtain the solute migration rule of the leaching solution in the ore bed. The pressure sensor 41 monitors the pressure change of the horizontal well 12 in the ore body material 11 along the course pore water, so as to reasonably adjust the pumping and injecting liquid amount and maintain the pumping and injecting balance.

The computer 43 can also receive the data monitored by the first flow meter 24, the first pressure gauge 25, the second flow meter 34 and the second pressure gauge 35, and the control of the flow rate and the pressure of the pumping liquid can be adjusted manually, or can be adjusted by the control of the computer 43.

The uranium concentration monitor 42 is an inductively coupled plasma mass spectrometer ICP-MS, and can obtain the uranium concentration in the leaching agent. The computer 43 may be a computer 43 in the prior art, which has functions of calculating data, receiving collected and monitored data, typing and outputting print data, etc., so that the computer 43 in the present application may be operated in coordination with the mining simulation, and the specific functions of the computer 43 will not be discussed.

Monitoring hydraulic pressure drop of the horizontal well 12 along the way by a pressure sensor 41 arranged along the way of the horizontal well 12, and providing basis for reasonably arranging the spatial position of a well pattern and the cutting density of a sieve tube; when the uranium concentration of the leachate is lower than 10mg/t, considering that the leachate enters the final stage of leaching, no acid solution is added, and only pumping and no injection are carried out until the simulated leaching process is finished; after the leaching is finished, carrying out uranium concentration measurement on the leaching solution, and estimating the recovery ratio; finally, typical sections of the ore bed (such as a horizontal section where the horizontal well 12 is located and a transverse section where the vertical well 13 is located) are cut, the pore structure and permeability of the ore are tested, the change of the physical characteristics of the sandstone in the process of leaching the horizontal well 12 is analyzed, and the flow-reaction-mass transfer process of the leaching solution is deeply understood.

As a specific embodiment of the horizontal well immersion mining simulation test system for sandstone uranium deposit provided by the invention, please refer to fig. 1 to 3, water-stop sheets 17 are respectively arranged at the upper part and the lower part of the ore body material 11, the water-stop sheets 17 are mudstone water-stop layers, and the water-stop sheets 17 play a role in preventing water penetration. The vertical wells 13 penetrate through the water stop plates 17 at the upper parts and then reach the interior of the ore body materials 11, the number of the vertical wells 13 is set to be four according to the size and the arrangement distance of the box bodies 15, and the vertical wells 13 are distributed on two sides of the horizontal well 12 and are continuously arranged along the trend of an ore bed.

The invention also provides a sandstone uranium ore horizontal well ground leaching exploitation simulation test method, which comprises the following steps:

arranging ore body materials 11 in the box body, arranging water-stop plates 17 at the upper part and the lower part of the ore body materials 11, arranging a horizontal well 12 along the horizontal direction of the ore body materials 11 and a plurality of vertical wells 13 along the vertical direction, and arranging a plurality of monitoring holes 14 on the ore body materials 11 along the horizontal well;

enabling the liquid injection device 2 to be communicated with one end of a horizontal well 12, injecting a leaching agent into the horizontal well 12 through the liquid injection device 2, and enabling the leaching agent to penetrate into the ore body material 11 and react with uranium in the ore body material 11;

the liquid extracting device 3 is communicated with the upper end of the vertical well 13, the leaching agent which is positioned in the ore body material 11 and reacts with uranium is extracted through the liquid extracting device 3, and the extracted leaching agent is contained in a container;

the horizontal well on-way pore water pressure in a monitoring hole 14 in the ore body material 11 is collected through the collecting and monitoring device 4, and the uranium concentration of the leaching agent in the container pumped out through the liquid pumping device 3 is monitored.

Before the simulation test is started, preparing a container, putting clean water into the container, and cleaning the ore bed of the ore body material 11 by the clean water through a liquid injection device 2; preparing a sulfuric acid solution and water in a container, mixing the sulfuric acid solution and the water to complete the preparation, and injecting the acid solution into an ore bed (an ore-containing aquifer) through an injection device 2 for acidizing the ore bed; finally, H is added into the container₂O₂The oxidant is injected into the interior of the ore bed through the liquid injection device 2, and the simulated leaching process is started.

The invention establishes a sandstone uranium ore horizontal well 12-place leaching exploitation simulation experiment system and a sandstone uranium ore horizontal well 12-place leaching exploitation simulation experiment method, which are used for simulating the whole process from drilling, liquid injection, leaching solution seepage migration, chemical reaction with ores to liquid extraction place leaching exploitation, and can monitor the pressure and flow of the leaching solution, the change of ion components of the leaching solution, the leaching range, the permeability of an ore layer, the change of a pore structure of the ore layer, the uranium content of the leaching solution and other information in real time in the whole process.

In the sandstone uranium ore horizontal well ground leaching and mining simulation test method, specific structural settings, specific operation steps and specific operation methods of the leaching device, the liquid injection device, the liquid extraction device and the collecting and monitoring device are all referred to the specific explanation of the sandstone uranium ore horizontal well ground leaching and mining simulation test system, and are not described here.

The sandstone uranium ore horizontal well ground immersion exploitation simulation test system and the test method have the beneficial effects that:

1) an indoor model test of the novel in-situ leaching uranium mining process is developed, in the mode of horizontal well 12 liquid injection and vertical well 13 liquid extraction, in-situ leaching mining of uranium resources is carried out, and yield increase effect evaluation of the horizontal well 12-situ leaching process can be realized;

2) the method can simulate the 12-place leaching extraction process of the sandstone uranium ore horizontal well, and optimizes and adjusts various influence factors such as injection pressure, pumping and injection liquid amount, well pattern arrangement and the like by monitoring the sweep range of leaching liquid and the uranium-containing concentration of the leaching liquid and exploring the optimal proportioning scheme of the leaching agent;

3) by monitoring the pore pressure of the ore bed, the ion concentration change of the leaching solution, the leaching effect of the ore bed and the pore change, the flow-reaction-mass transfer law of the leaching solution in the leaching process of the horizontal well 12 can be mastered.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.