Device and method for testing permeability of simulated underground leaching ore bed of sandstone type uranium deposit

Abstract

The invention discloses a sandstone type uranium mine simulated underground leaching ore bed permeability testing device, which comprises a liquid inlet cylinder with one closed end, two first valves arranged on the liquid inlet cylinder, and the cavity of the liquid inlet cylinder is a step cavity; one end of the liquid outlet cylinder is closed, two second valves are arranged on the liquid outlet cylinder, and a cavity of the liquid outlet cylinder is a step cavity; the middle sample clamping device comprises a sample cylinder, two pieces of filter paper, two pieces of gaskets and two sleeves, annular grooves are formed in the outer walls of the two ends of the sample cylinder, the filter paper, the gaskets and the sleeves are in one group and are sequentially arranged in the sample cylinder, a plurality of through holes are formed in the gaskets, and the sample cylinder is detachably connected with the liquid inlet cylinder and the liquid outlet cylinder; the liquid supply device is connected with one of the first valves and is used for supplying liquid into the liquid inlet cylinder; and collecting the container. According to the device and the method, the sandstone type uranium ore acid method underground leaching process can be accurately simulated, the original deep underground leaching process is intuitively simulated, and visual controllable operation is realized.

Description

Technical Field

[0001] The present invention relates to the permeability test process in the leaching process of sandstone-type uranium ore, and specifically to a device and method for testing the permeability of a simulated in-situ leaching ore layer of sandstone-type uranium ore. Background Art

[0002] At present, in-situ leaching of uranium, as an efficient uranium resource development technology, has become one of the main ways of uranium ore resource development in China. Sandstone-type uranium ore is the main uranium ore resource with commercial exploitation value in China, and its exploitation mainly adopts the in-situ leaching technology. This technology injects leaching agents such as sulfuric acid or ammonium bicarbonate + oxidant to change the valence state of uranium in the ore layer and improve its migration ability, so as to realize the extraction and purification of uranium resources. However, the in-situ leaching process of uranium mines goes deep into the ground by several hundred meters, and the ore-bearing aquifer has spatial heterogeneity, which makes the leaching agent flow non-uniformly after injection, thus affecting the leaching efficiency of uranium ore. In addition, the injection of the leaching agent may also pose a pollution risk to the groundwater environment.

[0003] Under the existing technical conditions, due to the pipe wall and turbulent flow effects, combined with the anisotropy of the regional characteristics of geological samples, it is difficult to measure the permeability during the in-situ leaching process of uranium mines. At present, there is no suitable instrument that can directly and quickly detect the real-time permeability of the ore body. Summary of the Invention

[0004] The purpose of the present invention is to solve the above technical problems and provide a device and method for testing the permeability of a simulated in-situ leaching ore layer of sandstone-type uranium ore.

[0005] The technical solution of the present invention: A device for testing the permeability of a simulated in-situ leaching ore layer of sandstone-type uranium ore includes:

[0006] A liquid inlet cylinder with one end closed, provided with two first valves, and the cavity of the liquid inlet cylinder is a stepped cavity;

[0007] A liquid outlet cylinder with one end closed, provided with two second valves, and the cavity of the liquid outlet cylinder is a stepped cavity;

[0008] An intermediate sample clamping device, which includes a sample cylinder, and two filter papers, gaskets and sleeves respectively. Annular grooves are provided on the outer walls at both ends of the sample cylinder. The filter paper, the gasket and the sleeve are a group and are sequentially arranged in the sample cylinder. A plurality of through holes are provided on the gasket, and the sample cylinder is detachably connected to the liquid inlet cylinder and the liquid outlet cylinder respectively;

[0009] A liquid supply device, connected to one of the first valves for supplying liquid to the liquid inlet cylinder.

[0010] A collection container, arranged below the second valve.

[0011] Preferably, the outer wall of the annular groove is provided with threads, and the sample cylinder is threadedly connected to the liquid inlet cylinder and the liquid outlet cylinder respectively through the threads on the outer wall of the annular groove.

[0012] Preferably, two cut surfaces are provided on each of the liquid inlet cylinder, the liquid outlet cylinder and the sample cylinder.

[0013] Preferably, sealing rings are provided at the joints of the sample cylinder with the liquid inlet cylinder and the liquid outlet cylinder.

[0014] Preferably, the liquid supply device includes a peristaltic pump and a liquid supply container, and the peristaltic pump is connected to one of the first valves and the liquid supply container through a pipeline.

[0015] The present invention also provides a method for testing the permeability of a sandstone-type uranium ore simulated underground leaching ore layer, including the following steps:

[0016] Step 1: Install a group of filter papers, gaskets and sleeves in the sample cylinder in sequence;

[0017] Step 2: Weigh 50 g - 200 g of sandstone-type uranium ore samples and put them into the sample cylinder;

[0018] Step 3: Then install another group of the filter papers, the gaskets and the sleeves in the sample cylinder in sequence, compact the sample between the two filter papers, and the compacted thickness of the sample is 2.0 cm - 2.5 cm;

[0019] Step 4: Install the liquid inlet cylinder and the liquid outlet cylinder on the sample cylinder respectively;

[0020] Step 5: Prepare the leaching agent with the optimal leaching concentration, use the peristaltic pump and draw the leaching agent in the liquid supply container through two silica gel tubes through one of the first valves into the liquid inlet cylinder, the leaching agent enters the sample cylinder for full leaching reaction, reaches the liquid outlet cylinder, and is discharged into the collection container at the second valve;

[0021] Step 6: Calculate the permeability coefficient of the sandstone-type uranium ore, which is obtained according to the following formula:

[0022] K = QL / ΔHA where K is the permeability coefficient / cm·s -1 ; Q is the flow rate of the leaching solution per unit time / cm 3 ·s -1 ;

[0023] ΔH is the head difference of the leaching solution passing through the rare earth ore sample / cm; A is the cross-sectional area of the sample / cm 2 ; L is the length of the sample through which the leaching solution flows / cm.

[0024] The beneficial effects of the present invention are:

[0025] 1. The present invention can accurately simulate the acid in-situ leaching process of sandstone-type uranium ore, visually simulate the leaching process originally hidden underground, and achieve visual and controllable operation. This feature not only provides an intuitive research platform for scientific researchers, but also can be widely applied to school teaching and laboratory demonstrations, helping students and researchers more intuitively understand the principle and process of in-situ leaching of uranium, and greatly improving the efficiency of teaching and scientific research.

[0026] 2. The present invention is not only applicable to the test of horizontal permeability, but also can be used for the test of vertical permeability according to the scene requirements. Just place the inlet and outlet positions of the device according to the requirements, which provides convenience for measuring permeability in different scenarios.

[0027] 3. The present invention is compact in design and convenient to operate, can be quickly installed and disassembled, meeting the diverse needs in actual scientific research and teaching. At the same time, its economic and practical characteristics give it significant advantages in large-scale promotion and application. Whether it is a scientific research institution, a university laboratory, or an industrial site, it can be easily deployed and used, providing strong guarantee for the development and popularization of uranium mining technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is an exploded view of the overall structure of the preferred embodiment of the present invention;

[0029] Figure 2 is a cross-sectional view of the liquid inlet cylinder in the preferred embodiment of the present invention;

[0030] Figure 3 is a cross-sectional view of the liquid outlet cylinder in the preferred embodiment of the present invention;

[0031] Figure 4 is a cross-sectional view of the connection between the sample cylinder, filter paper, gasket and sleeve in the preferred embodiment of the present invention;

[0032] Figure 5 is a cross-sectional view of the connection between the liquid inlet cylinder, liquid outlet cylinder and sample cylinder in the preferred embodiment of the present invention.

[0033] Reference numerals: liquid inlet cylinder 10, first valve 101, liquid outlet cylinder 2, second valve 201, sample cylinder 3, annular groove 301, filter paper 4, gasket 5, through hole 501, sleeve 6, collection container 7, peristaltic pump 8, liquid supply container 9. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Reference Figures 1 to 5 , a permeability testing device for simulating in-situ leaching orebody of sandstone-type uranium ore, comprising:

[0036] A liquid inlet cylinder 10 with one end closed, provided with two first valves 101 thereon, and the cavity of the liquid inlet cylinder 10 is a stepped cavity;

[0037] A liquid outlet cylinder 2 with one end closed, provided with two second valves 201 thereon, and the cavity of the liquid outlet cylinder 2 is a stepped cavity;

[0038] An intermediate sample clamping device, which includes a sample cylinder 3, and two filter papers 4, gaskets 5 and sleeves 6 each. Annular grooves 301 are provided on the outer walls at both ends of the sample cylinder 3. The filter papers 4, the gaskets 5 and the sleeves 6 are in a group and are sequentially arranged in the sample cylinder 3. A plurality of through holes 501 are provided on the gasket 5. The sample cylinder 3 is detachably connected to the liquid inlet cylinder 10 and the liquid outlet cylinder 2 respectively;

[0039] A liquid supply device, connected to one of the first valves 101 for supplying liquid into the liquid inlet cylinder 10.

[0040] A collection container 7, arranged below the second valve 201. In the present invention, a group of filter papers 4, gaskets 5 and sleeves 6 are sequentially installed in the sample cylinder 3. Weigh 50g - 100g of sandstone-type uranium ore sample, put it into the sample cylinder 3, and then install another group of filter papers 4, gaskets 5 and sleeves 6 in the sample cylinder 3 in sequence. The sample is compacted between the two filter papers 4, and the compacted thickness of the sample is 2.0cm - 2.5cm. The liquid inlet cylinder 10 and the liquid outlet cylinder 2 are respectively installed on the sample cylinder 3. The liquid supply device supplies the leaching agent to one of the first valves 101. The leaching agent enters the liquid inlet cylinder 10. Then, when opening the other first valve 101, the air in the liquid inlet cylinder 10 is discharged from the other first valve 101, and the leaching agent then enters the sample cylinder 3 for sufficient leaching reaction, reaches the liquid outlet cylinder 2. Then, when opening the right second valve 201 on the liquid outlet cylinder 2, the liquid in the liquid outlet cylinder 2 is discharged first, and then the leaching agent is discharged, and the discharged liquid falls into the collection container 7. Through the liquid outlet volume of the leaching solution, the accurate measurement of the permeability of the sandstone-type uranium ore is realized. The left second valve 201 on the liquid outlet cylinder 2 can be connected to another set of testing devices through a pipeline to supply liquid to it. Specifically, the collection container 7 is a beaker; the liquid inlet cylinder 10, the liquid outlet cylinder 2, the sample cylinder 3 and the gasket 5 are all made of polyethylene or polytetrafluoroethylene materials; the gasket 5 and the sleeve 6 are made of polytetrafluoroethylene materials; a plurality of through holes 501 are evenly arranged on the gasket 5 and the pore diameter is 2.0mm; one of the second valves 201 can discharge the leaching solution into the collection container 7 through a silica gel tube; the first valves 101 and the second valves 201 are ball valves made of stainless steel or polytetrafluoroethylene materials.

[0041] As a preferred embodiment of the present invention, it may further have the following additional technical features:

[0042] In this embodiment, threads are provided on the outer wall of the annular groove 301, and the sample cylinder 3 is threadedly connected to the liquid inlet cylinder 10 and the liquid outlet cylinder 2 respectively through the threads on the outer wall of the annular groove 301. By rotating the liquid inlet cylinder 10 and the liquid outlet cylinder 2, they can be installed with the sample cylinder 3, and the operation is convenient.

[0043] In this embodiment, two cut surfaces are provided on each of the liquid inlet cylinder 10, the liquid outlet cylinder 2 and the sample cylinder 3, which facilitates the rotation of the liquid inlet cylinder 10, the liquid outlet cylinder 2 and the sample cylinder 3 during installation.

[0044] In this embodiment, sealing rings are provided at the joints of the sample cylinder 3 with the liquid inlet cylinder 10 and the liquid outlet cylinder 2, which provides a better sealing effect. Specifically, the sealing rings are made of silica gel material.

[0045] In this embodiment, the liquid supply device includes a peristaltic pump 8 and a liquid supply container 9. The peristaltic pump 8 is connected to one of the first valves 101 and the liquid supply container 9 through a pipeline. After the leaching agent is prepared, the peristaltic pump 8 operates to pump out the leaching agent in the liquid supply container 9 and transport it into the first valve 101, and then it flows into the cavity of the liquid inlet cylinder 10 through the first valve 101. Specifically, the pipeline is a silica gel tube; the liquid supply container 9 is a beaker.

[0046] The present invention also provides a method for testing the permeability of a sandstone-type uranium ore simulated underground leaching ore layer, which includes the following steps:

[0047] Step 1: Install a group of filter papers 4, gaskets 5 and sleeves 6 in the sample cylinder 3 in sequence;

[0048] Step 2: Weigh 50 g - 200 g of sandstone-type uranium ore samples and put them into the sample cylinder 3;

[0049] Step 3: Then install another group of the filter papers 4, the gaskets 5 and the sleeves 6 in the sample cylinder 3 in sequence. The sample is compacted between the two filter papers 4, and the compacted thickness of the sample is 2.0 cm - 2.5 cm;

[0050] Step 4: Install the liquid inlet cylinder 10 and the liquid outlet cylinder 2 on the sample cylinder 3 respectively;

[0051] Step 5: Prepare the leaching agent with the optimal leaching concentration. Use the peristaltic pump 11 and two silica gel tubes to extract the leaching agent in the liquid supply container 9 and enter it into the liquid inlet cylinder 10 through one of the first valves 101. The leaching agent enters the sample cylinder 3 for full leaching reaction, reaches the liquid outlet cylinder 2, and is discharged into the collection container 7 at the second valve 201;

[0052] Step 6: Calculate the permeability coefficient of the sandstone-type uranium ore, which is obtained according to the following formula:

[0053] K = QL / ΔHA

[0054] In the formula, K is the permeability coefficient / cm·s -1 ; Q is the leaching solution flow rate per unit time / cm 3 ·s -1 ;

[0055] ΔH is the head difference of the leaching solution passing through the rare earth ore sample / cm, which is the height difference of the leaching solution before and after passing through the rare earth ore sample; A is the cross-sectional area of the sample / cm 2 , which is the cross-sectional area when the leaching solution flows through the sample; L is the length of the sample that the leaching solution flows through / cm, and the straight-line distance that the leaching solution flows through the sample, that is, the length of the sample, which refers to the straight-line path length from one end of the sample to the other end of the sample.

[0056] It should be noted that the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0057] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A test device for simulating the permeability of an underground leaching ore layer of sandstone-type uranium ore, characterized in that, Comprising: A liquid inlet cylinder (10) with one end closed, provided with two first valves (101) thereon, and the cavity of the liquid inlet cylinder (10) is a stepped cavity; A liquid outlet cylinder (2) with one end closed, provided with two second valves (201) thereon, and the cavity of the liquid outlet cylinder (2) is a stepped cavity; An intermediate sample clamping device, which includes a sample cylinder (3) and two pieces of filter paper (4), gaskets (5) and sleeves (6) respectively. Annular grooves (301) are provided on the outer walls at both ends of the sample cylinder (3). The filter paper (4), the gasket (5) and the sleeve (6) are a set and are sequentially arranged in the sample cylinder (3). A plurality of through holes (501) are provided on the gasket (5). The sample cylinder (3) is detachably connected to the liquid inlet cylinder (10) and the liquid outlet cylinder (2) respectively; A liquid supply device, connected to one of the first valves (101) for supplying liquid into the liquid inlet cylinder (10). A collection container (7), arranged below the second valve (201).

2. The permeability testing device for simulating an underground leaching orebody of sandstone-type uranium ore according to claim 1, wherein: Threads are provided on the outer wall of the annular groove (301), and the sample cylinder (3) is threadedly connected to the liquid inlet cylinder (10) and the liquid outlet cylinder (2) respectively through the threads on the outer wall of the annular groove (301).

3. A device for testing the permeability of an ore layer in the simulated in-situ leaching of sandstone-type uranium ore according to claim 1, characterized in that: Two cut surfaces are provided on each of the liquid inlet cylinder (10), the liquid outlet cylinder (2) and the sample cylinder (3).

4. A device for testing the permeability of an ore layer in the simulated in-situ leaching of sandstone-type uranium ore according to claim 1, characterized in that: Sealing rings are provided at the joints of the sample cylinder (3) with the liquid inlet cylinder (10) and the liquid outlet cylinder (2).

5. A device for testing the permeability of an ore layer in the simulated in-situ leaching of sandstone-type uranium ore according to claim 1, characterized in that: The liquid supply device includes a peristaltic pump (8) and a liquid supply container (9), and the peristaltic pump (8) is connected to one of the first valves (101) and the liquid supply container (9) through a pipeline.

6. A method for testing the permeability of an ore layer in the simulated in-situ leaching of sandstone-type uranium ore, characterized in that: Including the following steps: Step 1: Install a set of filter paper (4), gasket (5) and sleeve (6) in the sample cylinder (3) in sequence; Step 2: Weigh 50 g - 200 g of sandstone-type uranium ore sample and put it into the sample cylinder (3); Step 3: Then install another set of the filter paper (4), the gasket (5) and the sleeve (6) in the sample cylinder (3) in sequence. The sample is compacted between the two pieces of filter paper (4), and the compacted thickness of the sample is 2.0 cm - 2.5 cm; Step 4: Install the liquid inlet cylinder (10) and the liquid outlet cylinder (2) on the sample cylinder (3) respectively; Step 5: Prepare the leaching agent with the optimal leaching concentration. Use the peristaltic pump (11) and draw the leaching agent in the liquid supply container (9) through two silica gel tubes through one of the first valves (101) into the liquid inlet cylinder (10). The leaching agent enters the sample cylinder (3) for full leaching reaction, reaches the liquid outlet cylinder (2), and is discharged into the collection container (7) through the second valve (201); Step 6: Calculate the permeability coefficient of the sandstone-type uranium ore, which is obtained according to the following formula: K = QL / ΔHA where, K permeability coefficient / cm·s -1 ; Q leachate flow rate per unit time / cm 3 ·s -1 ; ΔH Head difference of the leaching solution passing through the rare earth ore sample / cm; A Cross-sectional area of the sample / cm 2 ; L Length of the sample through which the leaching solution flows / cm.

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