CN209979621U

CN209979621U - Infiltration-enhancing leaching test system for low-permeability uranium-bearing sandstone

Info

Publication number: CN209979621U
Application number: CN201920344384.7U
Authority: CN
Inventors: 赵勇; 雷林; 李向阳; 张德
Original assignee: University of South China
Current assignee: University of South China
Priority date: 2019-03-18
Filing date: 2019-03-18
Publication date: 2020-01-21
Anticipated expiration: 2029-03-18

Abstract

The utility model discloses a permeation-increasing leaching test system for low-permeability uranium-bearing sandstone, which comprises a water gas supply system, a high-low frequency excitation system, a leaching system and a data acquisition system; the system can test permeation enhancing leaching and radon precipitation of the low-permeability uranium-containing sandstone under the action of different vibration frequencies, vibration time, temperature, inflation pressure of carbon dioxide and oxygen, and can also test influence of the change of the vibration frequency, the vibration time, the temperature and the inflation pressure of air on radon precipitation of uranium-containing substances in the dispersion and the block under the action of vibration. The utility model discloses utilize ultrasonic wave, sound wave to vibrate the sample, increase sandstone porosity, the aggravation liquid flows for the contact of uranium-bearing sandstone and liquid, increase uranium and leach speed, detect the radon content change of vibration leaching in-process, for environment radon pollution makes the aassessment foundation, can stack the pollution problem that the in-process received air pressure, temperature, vibration influence radon to earth's surface uranium-bearing material to separate out simultaneously and carry out experimental research.

Description

Infiltration-enhancing leaching test system for low-permeability uranium-bearing sandstone

Technical Field

The utility model relates to a ground of hyposmosis uranium-bearing sandstone deposit soaks adopts technical field, in particular to hyposmosis uranium-bearing sandstone infiltration-enhancing leaching test system.

Background

The nuclear power is obtained by uranium nuclear fission, the energy released by the uranium nuclear fission is large, and greenhouse gases and other harmful dust are not emitted, so that the nuclear power is a clean energy source. Under the great situation that the environmental pollution is increasingly serious, all countries in the world are devoted to the development and utilization of nuclear power. In order to ensure a large amount of natural uranium required for nuclear power development, uranium ore mining is very important.

In the proven uranium resource reserves in China, the sandstone-type uranium ore resource amount accounts for about 35%, the low-permeability resource with the ore permeability less than 0.5m/d accounts for more than 70% of the sandstone-type resource, the low-permeability uranium-bearing sandstone has low porosity, so that the number of channels through which a leaching solution passes is small, the permeability coefficient of physical seepage is small, the ground leaching process parameters are arranged according to the conventional seepage rule, the leaching solution amount is small, the leaching rate is low, the mining cost is high, and the utilization of the sandstone-type uranium resource is hindered.

At present, the research on the ground leaching exploitation of the low-permeability uranium-bearing sandstone deposit is less, the research on the permeation-increasing leaching of the low-permeability uranium-bearing sandstone is not developed in the ground leaching exploitation of the low-permeability uranium-bearing sandstone deposit, and the research on the vibration frequency (low-frequency vibration and ultrasonic vibration), the vibration time, the leaching temperature and the inflation pressure change, the research on the leaching of the low-permeability uranium-bearing sandstone permeation-increasing uranium and the development of radon precipitation in the permeation-increasing process are blank.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a to hyposmosis uranium-bearing sandstone infiltration-enhancing leaching test system to obtain vibration, temperature, inflation pressure combined action under the hyposmosis uranium-bearing sandstone uranium leach, the change law that the radon was appeared.

The technical scheme of the utility model is that:

the infiltration-enhancing leaching test system for the low-permeability uranium-containing sandstone comprises a reaction device, wherein a heating device used for heating a sample, a water-gas supply system used for supplying water, oxygen, carbon dioxide gas and air to the interior of the reaction device, a high-frequency and low-frequency excitation system used for applying high-frequency vibration action and low-frequency vibration action required by a test to the reaction device, and a data acquisition system used for acquiring experimental data are respectively arranged on the reaction device.

Preferably, reaction unit is including the retort that is used for the splendid attire sample, the detachable flange two that is used for sealed admitting air, inlet pipe that is connected with in top of retort, the retort includes shell and one and locates the inside inner bag of shell, be provided with the clearance that the solution that is convenient for flows between inner bag and the shell, the inner bag includes two hollow semicylinders that the looks lock-joint constitutes the cylinder together, set up a plurality of meshs that are used for realizing solution and sample uniform contact of equipartition on the courage wall of inner bag.

Preferably, the bottom of the shell is provided with a plug and a liquid taking device, and the liquid taking device is used for taking part of the leaching liquid out of the reaction tank for measurement in the test process.

Preferably, the liquid taking device comprises a liquid taking hole formed in the bottom of the shell, and the liquid taking hole is in threaded connection with a valve used for controlling the on-off of liquid.

Preferably, a plurality of lugs for supporting the inner container are arranged in the gap, and the side of the lug departing from the inner container is fixedly connected with the inner wall of the shell.

Preferably, heating device includes the suit at the outside heating jar of retort, evenly be provided with the heater strip in the heating jar, the heater strip electricity is connected with temperature controller, temperature controller passes through control switch and is connected with power supply electricity.

Preferably, the heating tank is arranged on a supporting device, the supporting device comprises a first support fixedly connected with the heating tank, and the first support is fixedly connected with a base arranged below the first support.

Preferably, the water gas supply system includes a water supply unit for supplying the test water into the liner, an oxygen supply unit for supplying the carbon dioxide gas required for the test into the liner, a carbon dioxide gas supply unit for supplying the oxygen gas at a flow rate required for the test into the liner, and an air intake unit; the water supply unit comprises a liquid injection tank, the liquid injection tank is communicated with the inner container, and a second stop valve is arranged on a pipeline between the liquid injection tank and the inner container; the carbon dioxide gas supply unit comprises a carbon dioxide high-pressure gas cylinder, an outlet of the carbon dioxide high-pressure gas cylinder is sequentially connected with a first pressure reducing valve, a first flowmeter, a first booster pump and a first one-way valve, and the first one-way valve is communicated with the inner part of the inner container; the air inlet unit comprises a first stop valve connected between the first flowmeter and the first booster pump through a tee joint, and the first stop valve is communicated with the air compressor; the oxygen supply unit comprises an oxygen high-pressure gas cylinder, an outlet of the oxygen high-pressure gas cylinder is sequentially connected with a second pressure reducing valve, a second flowmeter, a second booster pump and a second one-way valve, and the second one-way valve is communicated with the inside of the inner container.

Preferably, the high-low frequency excitation system comprises an ultrasonic vibrator for applying high-frequency vibration action required by a test to the reaction device and a low-frequency vibration exciter for applying low-frequency vibration action required by the test to the reaction device; the ultrasonic vibrator is electrically connected with the ultrasonic generator, the ultrasonic vibrator is fixedly connected with the first flange, and the first flange is detachably connected to the bottom of the heating tank; the low-frequency vibration exciter is fixedly connected to a second support, and the second support is fixedly connected with the base; the low-frequency vibration exciter is connected with a vibration control device, the vibration control device comprises a power amplifier electrically connected with the low-frequency vibration exciter, the power amplifier is electrically connected with the frequency sweeping signal generator, and the low-frequency vibration exciter is fixedly connected with the first support.

Preferably, the data acquisition system comprises a force sensor arranged on the first bracket, the force sensor is electrically connected with a charge amplifier, and the charge amplifier is electrically connected with the data acquisition unit; the data acquisition system also comprises a second air pressure gauge and an air pressure sensor which are arranged on the reaction tank and used for measuring the internal pressure of the reaction tank; the data acquisition system further comprises a gas collection tank, a first air pressure gauge is arranged on the gas collection tank, the gas collection tank is sequentially connected with a fifth stop valve, a filter and a third stop valve, the third stop valve is connected with the reaction tank, a vacuum pump, a fourth stop valve and a third pressure reducing valve are further connected to a pipeline between the fifth stop valve and the filter through a five-way valve, the fourth stop valve is communicated with the atmosphere, and the third pressure reducing valve is connected with the gas collection tank; and the gas collecting tank is sequentially connected with the pressure reducing valve IV and the flowmeter III through pipelines and then communicated with the radon detector.

Compared with the prior art, the utility model provides a pair of to hyposmosis uranium-bearing sandstone infiltration enhancing and leaching test system's beneficial effect is:

the utility model provides a to hyposmosis uranium-bearing sandstone infiltration enhancing and leaching, radon precipitation test's system under different vibration frequency, vibration time, temperature, inflation pressure effect, vibration frequency, vibration time, temperature, inflation pressure change leach uranium-bearing sandstone uranium, radon precipitation influence is experimental under can carrying out the vibration effect to and uranium-bearing material receives air pressure, temperature, vibration influence radon precipitation test such as uranium tailings, granite.

The whole test system mainly comprises a water-gas supply system, a data acquisition system, a high-low frequency excitation system and a leaching system, can realize accurate adjustment of inflation pressure, vibration frequency, vibration time and temperature, can realize the real-time sampling of leachate, leached sandstone and gas in a reaction tank under the vibration action, and provides possibility for uranium leaching rate analysis under the vibration stress-seepage-temperature coupling action and carries out comprehensive analysis on radon precipitation.

The utility model discloses low, the few problem of uranium leaching amount develops to the hyposmosis uranium-bearing sandstone permeability, the reduction process of leaching, utilize ultrasonic wave, sound wave to vibrate the sandstone, increase sandstone porosity, thereby increase the uranium leaching rate, the simultaneous vibration can aggravate the liquid flow, the contact of uranium-bearing sandstone and liquid accelerates the uranium leaching rate, for uranium ore production increase provides service, detect simultaneously and leach the radon content change of in-process, make the aassessment for environment radon pollutes. In addition, the test device can also be used for researching the problem that radon precipitation pollution is influenced by air pressure, temperature and vibration in the stacking process of uranium-containing substances on the ground surface such as uranium tailings and granite.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a partial enlarged view A of the present invention;

FIG. 3 is a schematic structural view of the water and gas supply system of the present invention;

fig. 4 is a first schematic structural diagram of the data acquisition system of the present invention;

fig. 5 is a schematic structural diagram of a high and low frequency excitation system of the present invention;

fig. 6 is a schematic structural diagram of a data acquisition system of the present invention;

fig. 7 is a schematic view of the inner container ejected from the reaction tank.

Reference numerals:

1. a carbon dioxide high pressure gas cylinder; 2. an oxygen high pressure cylinder; 3. a first pressure reducing valve; 4. a second pressure reducing valve; 5. a first flowmeter; 6. a first stop valve; 7. an air compressor; 8. a second stop valve; 9. a liquid injection tank; 10. a third stop valve; 11. a filter; 12. a vacuum pump; 13. a stop valve IV; 14. a fifth stop valve; 15. a third pressure reducing valve; 16. a third flowmeter; 17. a radon measuring instrument; 18. a pressure reducing valve IV; 19. a first barometer; 20. a gas collection tank; 21. a second bracket; 22. a base; 23. a force sensor; 24. an ultrasonic vibrator; 25. a first bracket; 26. a base moving handle; 27. a liquid taking device; 28. a second one-way valve; 29. a first booster pump; 30. a second booster pump; 31. a second flowmeter; 32. a one-way valve I; 33. a second barometer; 34. an air pressure sensor; 35. a charge amplifier; 36. a data acquisition unit; 37. a power amplifier; 38. a sweep frequency signal generator; 39. a low-frequency vibration exciter; 40. a temperature controller; 41. an ultrasonic generator; 42. a top cover fixing screw; 43. a first flange; 44. a reaction tank; 45. a plug; 46. fixing screws; 47. a heating tank; 48. a second flange; 49. an inner container; 50. the long rod is screwed.

Detailed Description

An embodiment of the present invention will be described in detail with reference to fig. 1 to 7, but it should be understood that the scope of the present invention is not limited by the embodiment.

As shown in fig. 1, the infiltration-increasing leaching test system for the low-permeability uranium-bearing sandstone comprises a reaction device, wherein a heating device for heating a sample, a water-gas supply system for supplying water, oxygen, carbon dioxide gas and air to the interior of the reaction device, a high-frequency and low-frequency excitation system for applying high-frequency vibration and low-frequency vibration required by a test to the reaction device, and a data acquisition system for acquiring experimental data are respectively arranged on the reaction device.

Further, as shown in fig. 2, the reaction device includes a reaction tank 44 for holding the sample, the top of the reaction tank 44 is detachably connected with a flange two 48 for sealing air inlet and water inlet, the reaction tank 44 includes a housing and a liner 49 arranged inside the housing, a gap for facilitating the flow of the leaching solution is arranged between the liner 49 and the housing, the liner 49 includes two hollow semicylinders which are mutually buckled to form a cylinder, and a plurality of meshes for realizing uniform contact of the leaching solution and the sample are uniformly distributed on the liner wall of the liner 49.

Further, the bottom of the shell is provided with a plug 45 and a liquid taking device 27, and the liquid taking device 27 is used for taking part of the leaching liquid out of the reaction tank 44 for measurement in the test process.

Further, the liquid taking device 27 comprises a liquid taking hole formed in the bottom of the housing, and the liquid taking hole is in threaded connection with a valve for controlling the on-off of liquid.

Furthermore, a plurality of convex blocks used for supporting the inner container 49 are arranged in the gap, and the side surface of the convex block departing from the inner container 49 is fixedly connected with the inner wall of the shell.

Further, heating device includes that the suit is at the outside heating jar 47 of retort 44, evenly be provided with the heater strip in the heating jar 47, the heater strip electricity is connected with temperature controller 40, temperature controller 40 is connected with power supply electricity through control switch.

Further, the heating tank 47 is disposed on a supporting device, the supporting device includes a first bracket 25 fixedly connected to the heating tank 47, and the first bracket 25 is fixedly connected to the base 22 disposed below the first bracket 25.

Further, as shown in fig. 3, the water gas supply system includes a water supply unit for supplying test water into the inner container 49, an oxygen supply unit for supplying carbon dioxide gas required for the experiment into the inner container 49, a carbon dioxide gas supply unit for supplying oxygen gas at a flow rate required for the experiment into the inner container 49, and an air intake unit; the water supply unit comprises a liquid injection tank 9, the liquid injection tank 9 is communicated with the inner container 49, and a second stop valve 8 is arranged on a pipeline between the liquid injection tank 9 and the inner container 49; the carbon dioxide gas supply unit comprises a carbon dioxide high-pressure gas cylinder 1, an outlet of the carbon dioxide high-pressure gas cylinder 1 is sequentially connected with a first reducing valve 3, a first flowmeter 5, a first booster pump 29 and a first one-way valve 32, and the first one-way valve 32 is communicated with the inner container 49; the air inlet unit comprises a first stop valve 6 connected between a first flowmeter 5 and a first booster pump 29 through a tee joint, and the first stop valve 6 is communicated with the air compressor 7; the oxygen supply unit comprises an oxygen high-pressure gas cylinder 2, an outlet of the oxygen high-pressure gas cylinder 2 is sequentially connected with a second pressure reducing valve 4, a second flowmeter 31, a second booster pump 30 and a second one-way valve 28, and the second one-way valve 28 is communicated with the inner container 49.

Further, as shown in fig. 5, the high and low frequency excitation system includes an ultrasonic vibrator 24 for applying a high frequency vibration action required for a test to the reaction device and a low frequency exciter 39 for applying a low frequency vibration action required for a test to the reaction device; the ultrasonic vibrator 24 is electrically connected with the ultrasonic generator 41, the ultrasonic vibrator 24 is fixedly connected with a first flange 43, and the first flange 43 is detachably connected to the bottom of the heating tank 47; the low-frequency vibration exciter is a low-frequency vibration exciter 39 fixedly connected to a second bracket 21, and the second bracket 21 is fixedly connected with the base 22; the low-frequency vibration exciter 39 is connected with a vibration control device, the vibration control device comprises a power amplifier 37 electrically connected with the low-frequency vibration exciter 39, the power amplifier 37 is electrically connected with the sweep frequency signal generator 38, and the low-frequency vibration exciter 39 is fixedly connected with the first bracket 25.

Further, as shown in fig. 4 and 6, the data acquisition system includes a force sensor 23 disposed on the first bracket 25, the force sensor 23 is electrically connected to a charge amplifier 35, and the charge amplifier 35 is electrically connected to a data collector 36; the data acquisition system also comprises a second barometer 33 and a second barometer 34 which are arranged on the reaction tank 44 and used for measuring the internal pressure of the reaction tank 44; the data acquisition system further comprises a gas collection tank 20, a first air pressure gauge 19 is arranged on the gas collection tank 20, the gas collection tank 20 is sequentially connected with a fifth stop valve 14, a filter 11 and a third stop valve 10, the third stop valve 10 is connected with a reaction tank 44, a vacuum pump 12, a fourth stop valve 13 and a third pressure reducing valve 15 are further connected to a pipeline between the fifth stop valve 14 and the filter 11 through a five-way joint, the fourth stop valve 13 is communicated with the atmosphere, and the third pressure reducing valve 15 is connected with the gas collection tank 20; the gas collecting tank 20 is sequentially connected with the pressure reducing valve IV 18 and the flowmeter III 16 through pipelines and then communicated with the radon measuring instrument 17.

As shown in figure 1, figure 2 and figure 3, the embodiment of the utility model provides a to hyposmosis uranium-bearing sandstone infiltration leaching test system, the utility model relates to a to hyposmosis uranium-bearing sandstone infiltration leaching test system under different vibration frequency, temperature, inflation pressure effect, vibration frequency, vibration time, temperature, inflation pressure change leach to uranium, radon are appeared and are influenced the experiment under can carrying out the vibration effect, and the system is withstand voltage 0 to 10 megapascals in the test process.

As shown in fig. 1, the whole testing system mainly comprises four parts, namely a water-gas supply system, a data acquisition system, a high-low frequency excitation system and a leaching system, the device can realize the accurate adjustment of inflation pressure, vibration frequency, vibration time and temperature, can realize the research on the chemical components of leaching liquid under the vibration action and the change of porosity and permeability of a sample, can realize the comprehensive analysis of uranium leaching and radon precipitation under the vibration stress-seepage-temperature coupling action, and can also perform measurement and analysis on the problem of radon precipitation of uranium-containing substances accumulated on the earth surface, such as uranium tailings, granite and the like, under the action of air pressure, temperature and vibration.

The utility model provides a to hyposmosis uranium-bearing sandstone infiltration augmentation leaching test system, includes aqueous vapor feed system, high low frequency excitation system, leaches out system and data acquisition system, and main reaction unit is the retort, has seted up feed liquor hole, inlet port, air extraction hole, liquid extraction hole and outage on the retort, and the external force that the retort received mainly comes from ultrasonic vibrator, low frequency vibration exciter, data acquisition by data collection ware, gas pressure sensing device, emanometer.

Before the experiment, for annotating liquid case 9 water injection, open stop valve two 8 earlier, the volume cup volume is got a certain amount of water and is packed into annotating liquid case 9, and water flows into retort 44 through stop valve two 8 by annotating the liquid case, annotates liquid case 9 to two 8 pipelines of stop valve and is the metal hard tube coupling, and stop valve two 8 adopt metal collapsible tube to retort 44 part, can effectively prevent to vibrate.

The carbon dioxide gas is decompressed to atmospheric pressure from a carbon dioxide high-pressure gas cylinder 1 through a first pressure reducing valve 3 and then enters a first flowmeter 5, the first flowmeter 5 is metered and then enters a first booster pump 29 to be boosted to test pressure, the first carbon dioxide gas enters a reaction tank 44 through a first check valve 32, a high-pressure metal hard pipe is adopted from the gas cylinder to the first check valve 32, the first check valve 32 enters the reaction tank 44 and adopts a metal hose, the pipeline can be effectively prevented from being damaged by vibration, and the pressure reducing valve arranged in front of the flowmeter can effectively protect the flowmeter from high-pressure damage; the booster pump can provide the pressure required by the test into the reaction tank 44, and the one-way valve can effectively protect the booster pump from the influence of the recoil pressure of the reaction tank 44.

The oxygen is decompressed to atmospheric pressure from the oxygen high-pressure gas cylinder 2 through the pressure reducing valve II 4 and then enters the flow meter II 31, the flow meter II 31 is metered and then enters the booster pump II 30, the pressure is increased to the pressure required by the test through the booster pump II 30, the oxygen enters the one-way valve II 28 and flows into the reaction tank 44, the oxygen from the gas cylinder to the one-way valve II 28 adopts a high-pressure metal hard pipe, and the oxygen from the one-way valve II 28 enters the reaction tank 44 and adopts a metal hose.

In the uranium leaching test of bulk uranium ore or pressed uranium ore, water is injected into the reaction tank 44, and then carbon dioxide and oxygen are sequentially injected.

Before the experiment, if only inject air into retort 44, mainly do discrete uranium ore, uranium tail sand radon and separate out the experiment, adopt air compressor machine 7 to provide the wind pressure in the test process, utilize booster pump 29 pressure boost to the required pressure of experiment, flow into retort 44 through check valve 32, because there is impurity in the high-pressure oxygen admission line, it is very easy to rub out mars and cause the explosion in the aeration process, therefore this way of air admission and carbon dioxide admission share a booster pump and a check valve, the concrete connection mode is air compressor machine 7 gas inflow stop valve one 6, because sharing the booster pump with the carbon dioxide admission line, here need use stop valve one 6 control air admission and prevent carbon dioxide gas leakage, the gas comes out from stop valve one 6 and gets into booster pump one 29, reentrant check valve one 32, get into retort 44.

When the radon precipitation test is carried out under the influence of air pressure, temperature and vibration in the process of stacking the uranium-containing substances on the ground surface, only air needs to be injected into the reaction tank 44.

The main reaction vessel is a reaction tank 44, the top and the bottom of the reaction tank 44 are fixed by flanges, the top of the reaction tank 44 is fixed with a flange II 48 by a top cover fixing screw 42 and used for sealing an air inlet pipeline and a water inlet pipeline, the flange I43 is fixed with an ultrasonic vibrator 24, two half-pull-shaped porous inner containers 49 are arranged in the reaction tank, after the test is finished, a plug 45 at the bottom of the reaction tank 44 can be detached, a long rod thread bolt 50 is used for ejecting the inner containers 49 of the reaction tank, and the inner containers 49 are broken to obtain samples.

Wherein, the bottom of the reaction tank is provided with a liquid taking device 27, and part of the leaching liquid can be taken by the liquid taking device 27 for measurement in the test process.

Wherein, the ultrasonic vibrator 24 is welded on the first flange 43, and directly applies high-frequency vibration force to the reaction tank 44 through the first flange 43; the low-frequency vibration exciter 39 is connected with the first support 25 through a long-handle screw rod, and in the vibration process, the vibration exciter 39 drives the reaction tank 44 to vibrate through the long-handle screw rod fixed on the first support 25.

Wherein, the heating tank 47 is tightly sleeved outside the reaction tank 44, heating wires are uniformly distributed in the heating tank 47, the reaction tank 44 and the ultrasonic vibrator 24 are fixed by the first flange 43, and the heating tank 47 is controlled by the temperature controller 40 and connected through a cable.

Wherein, the reaction tank 44 and the low-frequency vibration exciter 39 are jointly fixed on the same base.

The vibration control device comprises a power amplifier 37 and a sweep frequency signal generator 38 which are connected by a cable, wherein the connection sequence is that the sweep frequency signal generator 38 enters the power amplifier 37 and then enters a low-frequency vibration exciter 39, the sweep frequency signal generator provides a signal source, and the power amplifier amplifies the signal and then transmits the signal to the low-frequency vibration exciter for vibration.

The signal acquisition system comprises a charge amplifier 35 and a data acquisition unit 36, the charge amplifier 35 and the data acquisition unit 36 are connected by a cable, the connection sequence is signals acquired by the sensor 23, and the signals are input into the charge amplifier 35, amplified and transmitted into the data acquisition unit 36.

Wherein, data acquisition system mainly includes gas collecting tank 20, vacuum pump 12, three 15 of relief pressure valve, four 18 and emanometer 17 of relief pressure valve, wherein adopts metal collapsible tube between retort 44 to three 10 of stop valve, cuts to three 10 of valve and all adopts the metal hard tube to the device end, and the part that the pipeline is connected with retort 44 adopts metal collapsible tube, can effectively prevent the influence of vibration to the pipeline, and specific tube coupling is: the gas in the reaction tank 44 flows out from the pipeline and flows into the stop valve III 10, then flows into the filter 11, fine dust entering the pipeline from the reaction tank 44 is filtered, then enters the pressure reducing valve III 15 to be reduced, and then flows into the gas collecting tank 20, when the pressure in the gas collecting tank 20 reaches a certain value, the radon measuring instrument 17 is opened, the pressure reducing valve IV 18 is set, the gas in the gas collecting tank 20 flows into the pressure reducing valve IV 18, and after being measured by the flow meter III 16, the gas enters the radon measuring instrument 17 to measure radon.

After the test is finished, in order to evacuate the gas collecting tank 20 and the reaction tank 44 and prevent the internal pressure of the gas collecting tank 20 and the reaction tank 44 from being overlarge, a bypass is arranged on a pipeline between the gas collecting tank 20 and the vacuum pump 12 and is controlled by the three stop valves 10, the four stop valves 13 and the five stop valves 14, so that the gas collecting tank 20 and the reaction tank 44 are protected.

The water and gas supply system of the test system mainly comprises a carbon dioxide high-pressure gas cylinder 1, an oxygen high-pressure gas cylinder 2, a first pressure reducing valve 3, a second pressure reducing valve 4, a first flow meter 5, a second flow meter 31, a first stop valve 6, a second stop valve 8, an air compressor 7, a liquid injection tank 9, a first booster pump 29, a second booster pump 30, a second check valve 28 and a first check valve 32.

The data acquisition system also comprises a charge amplifier 35, a data acquisition unit 36, a power amplifier 37, a sweep frequency signal generator 38, a temperature controller 40, an ultrasonic generator 41, a second air pressure meter 33 and an air pressure sensor 34.

The high-low frequency excitation system mainly comprises a low-frequency exciter 39, a second bracket 21, a base 22, a force sensor 23, an ultrasonic vibrator 24 and a base moving handle 26.

Wherein, a base moving handle 26 is arranged on the base 22 to facilitate moving the base 22.

When the gas pressure in the gas cylinder is lower than the pressure required by the test, a first booster pump 29 is used, a second booster pump 30 is used for realizing accurate boosting, a second check valve 28 and a first check valve 32 can realize one-way flow of high-pressure gas, the reaction tank 44 fixes the sealing cover and the heating tank on the tank body of the reaction tank 44 through 8 hexagon socket head cap screws, gas and liquid flow into the reaction tank 44 through a gas inlet hole and a liquid inlet hole at the top of the sealing cover, the reaction tank 44 is 130mm in inner diameter and 210mm in height and bears the gas pressure of 10MPa, two hollow semi-cylindrical porous inner containers 49 are arranged in the reaction tank 44, and two cylinders with 50mm in inner diameter and 100. In order to prevent air leakage and liquid leakage in the test process, the plug 45 is used for plugging the die withdrawing hole at the bottom of the tank body, the plug 45 is disassembled after the test is finished, as shown in fig. 7, the long rod threaded bolt 50 is used for slowly ejecting the porous inner container 49 out of the reaction tank 44 to obtain a test piece, and the inner container 49 can be taken out if the test piece adopts discrete bodies. The vibration exciter 39, the ultrasonic vibrator 24 and the reaction tank 44 are connected in a rigid connection manner, so that the vibration force is transmitted accurately. The atmospheric pressure sensor 34 and the barometer 33 which are arranged on the tank body of the reaction tank 44 can realize accurate control of the pressure in the tank body, the filter 11 can effectively prevent impurities coming out of the tank body of the reaction tank 44 from entering the vacuum pump 12 and the gas collecting tank 20, the vacuum pump 12 can vacuumize the reaction tank 44 and the gas collecting tank 20, the barometer 19 can realize that gas with the same pressure is taken from the reaction tank 44 in each test, the pressure reducing valve fourth 18 between the gas collecting tank 20 and the radon measuring instrument 17 sets an atmospheric pressure to protect the radon measuring instrument 17 in the test process, and the flowmeter 16 can realize accurate measurement of the gas entering the radon measuring instrument 17.

The test process comprises the following steps:

A. leaching measurement test

1. And (3) air tightness detection: before the test, the air tightness of the device is detected, so that the device is ensured to be airtight.

2. Degassing: closing all valves, opening the three 10 and five 14 stop valves of the vacuum pump 12 connected with the gas collecting tank 20 and the reaction tank 44, opening the vacuum pump 12, degassing the reaction tank 44 and the gas collecting tank 20, and closing the vacuum pump 12, the three 10 and the five 14 stop valves after a period of time.

3. Temperature adjustment: in the low-frequency vibration test, the temperature is adjusted by using the heating tank 47 controlled by the temperature controller 40, the temperature controller 40 is started to enable the temperature of the heating wires uniformly distributed in the heating tank 47 to rise to a set temperature, and in the test, the temperature can be set to 30 ℃, 40 ℃, 50 ℃ and 60 ℃ according to the test requirements, and the temperature of the reaction tank 44 is controlled by closely attaching the heating tank 47 to the reaction tank 44.

4. Liquid injection: and opening a second stop valve 8 of the liquid injection tank 9 connected with the reaction tank 44, injecting the groundwater with certain mass into the liquid injection tank 9 through the measuring cup, enabling the groundwater to flow into the reaction tank 44 from the liquid injection tank through a pipeline, ensuring that a test piece is submerged, and closing the second stop valve 8 after the liquid completely flows into the reaction tank 44.

5. Oxygen injection: setting a second pressure reducing valve 4 connected with the oxygen high-pressure gas cylinder 2, opening a second booster pump 30, opening a second one-way valve 28, injecting oxygen with certain pressure into the reaction tank 44, and in the experiment, injecting oxygen with the pressure of 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa, 0.5MPa, 0.6MPa, 0.7MPa, 0.8MPa, 0.9MPa and 1MPa according to the experiment requirement, and then closing the second booster pump 30 and the second pressure reducing valve 4.

6. Injecting carbon dioxide: and setting a first pressure reducing valve 3, opening a first booster pump 29, opening a first check valve 32, and injecting carbon dioxide with a certain pressure into the reaction tank 44, wherein in the experiment, carbon dioxide with the pressures of 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa, 0.5MPa, 0.6MPa, 0.7MPa, 0.8MPa, 0.9MPa and 1MPa is injected according to the experiment requirement, the pressure for injecting the carbon dioxide is higher than the pressure of the injected oxygen, different experiments can be carried out by different pressure combinations, and the first booster pump 29 and the first pressure reducing valve 3 are closed in sequence.

7a, low-frequency vibration: the charge amplifier 35, the data collector 36, the power amplifier 37, the sweep frequency signal generator 38 and the low-frequency vibration exciter 39 are sequentially turned on, the vibration reaction tank 44 is vibrated for a certain time (vibration frequencies of 10Hz, 20Hz, 30Hz, 40Hz and 50Hz are set according to experiment requirements, vibration time can be set to be 5min, 10min, 15min, 20min, 25min and 30min, and tests can be performed under different conditions by combining different vibration time and vibration frequency under the action of different inflation pressures), and vibration excitation is stopped.

7b, high-frequency vibration: the ultrasonic generator 41 is turned on, the ultrasonic vibrator 24 at the bottom of the reaction tank 44 is used for applying a vibration force to the reaction tank 44, and the reaction tank 44 is vibrated for a certain time and then stops exciting (the vibration frequency is set to be 28KHz and 40KHz according to the experiment requirement, the vibration time can be set to be 5min, 10min, 15min, 20min, 25min and 30min, and under the action of different inflation pressures, different vibration times and vibration frequencies are combined to perform the experiment under different conditions).

8. Gas taking: and opening a third pressure reducing valve 15 connected with the reaction tank 44 and the gas collecting tank 20, and closing the pressure reducing valve after injecting gas with certain pressure into the gas collecting tank 20 (the gas taking pressure is determined according to the pressure in the reaction tank, and the gas taking pressure is the same value in each experiment).

9. Radon measurement: and (3) opening the radon measuring instrument 17, and adjusting the pressure of a pressure reducing valve four 18 between the gas collecting tank 20 and the flowmeter three 16 to ensure that the pressure of an outlet end of the pressure reducing valve four 18 reaches one atmospheric pressure.

10. Liquid taking: opening the fourth stop valve 13, the third stop valve 10 between the filter 11 and the reaction tank 44, discharging the residual gas in the reaction tank 44 to the atmosphere until the tank pressure shows an atmospheric pressure, closing the third stop valve 10 and the fourth stop valve 13, opening the liquid taking device 27, and taking out a certain amount of liquid.

11. The test was repeated: repeating the step 4 to inject the liquid into the reaction tank 44 until the liquid with the same volume as that in the step 4 is supplemented, and stopping injecting; repeating the step 5 to inject oxygen into the reaction tank 44 at the same pressure as that in the step 5; repeating the step 6 to inject carbon dioxide into the reaction tank 44 at the same pressure as that in the step 6; the process operations of 7, 8, 9 and 10 are repeated.

12. Ion analysis: performing ion analysis on the obtained liquid to obtain uranium leaching rates under different conditions; the obtained gas is measured by a radon detector to obtain the change of the radon precipitation amount in the test process.

B. Radon precipitation test for uranium-containing substances

2. Degassing: closing all valves, opening the three 10 and five 14 stop valves of the vacuum pump 12 connected with the reaction tank 44 and the gas collecting tank 20, opening the vacuum pump 12, degassing the reaction tank 44 and the gas collecting tank 20, and after a period of time, closing the vacuum pump 12, the three 10 stop valves and the five 14 stop valves.

3. And (3) inflating: and (3) opening the first stop valve 6, opening the first check valve 32, and opening the first air compressor 7 and the first booster pump 29, wherein the first air compressor 7 and the first booster pump 29 are required to be opened all the time in the test process to keep the sample subjected to constant air pressure. (0.1 MPa, 0.2MPa, 0.3MPa, 0.4MPa, 0.5MPa, 0.6MPa can be selected according to the test requirements)

4. And (3) constant temperature: the temperature was adjusted to be constant at the set values of the test (30 ℃, 40 ℃, 50 ℃, 60 ℃ can be set according to the test requirements)

5. Radon measurement: opening a third pressure reducing valve 15 between the vacuum pump 12 and the gas collecting tank 20 and a fourth pressure reducing valve 18 between the gas collecting tank 20 and the radon measuring instrument 17, and measuring the radon content in the outflow gas by using the radon measuring instrument 17

6. The constant pressure in the reaction tank 44 must be maintained during the test, and the constant pressure value in the reaction tank 44 must be ensured by adjusting the first air inlet booster pump 29 and the third pressure reducing valve 15 at the air outlet, and the pressure values are different in different tests.

To sum up, the embodiment of the utility model provides a to hyposmosis uranium-bearing sandstone increase infiltration and leach test system under different vibration frequency, temperature, inflation pressure effect, vibration frequency, vibration time, temperature, inflation pressure change leach to uranium, radon are appeared and are influenced the experiment under can carrying out the vibration effect. The whole test system mainly comprises a water-gas supply system, a data acquisition system, a high-low frequency excitation system and a leaching system, can realize accurate adjustment of inflation pressure, vibration frequency, vibration time and temperature, can realize research on chemical components of leaching liquid under the vibration effect and porosity and permeability changes of a sample, and can realize comprehensive analysis of uranium leaching and radon precipitation under the vibration stress-seepage-temperature coupling effect. The utility model discloses low to the hyposmosis uranium-bearing sandstone permeability, the problem that the uranium leaching amount is few expandes, the reduction process of leaching, utilize ultrasonic wave, the sound wave vibrates the sandstone, increase sandstone porosity, thereby increase uranium leaching rate, the liquid flow can aggravate to the simultaneous vibration, the contact of uranium-bearing sandstone and liquid is quickened, accelerate uranium leaching rate, for the uranium ore production increase provides service, detect the radon content change of leaching the in-process, make aassessment and measurement for environment radon pollutes. Simultaneously the utility model discloses also can be to the accumulational uranium-bearing material of earth's surface such as uranium tailings, granite, under air pressure, temperature, vibration effect, the radon precipitation volume change is measured.

The above disclosure is only for a few specific embodiments of the present invention, however, the present invention is not limited to the embodiments, and any changes that can be considered by those skilled in the art shall fall within the protection scope of the present invention.

Claims

1. The infiltration-enhancing leaching test system for the low-permeability uranium-containing sandstone is characterized by comprising a reaction device, wherein the reaction device is respectively provided with a heating device for heating a sample, a water-gas supply system for supplying water, oxygen, carbon dioxide gas and air to the interior of the reaction device, a high-frequency and low-frequency excitation system for applying high-frequency vibration and low-frequency vibration required by a test to the reaction device, and a data acquisition system for acquiring experimental data.

2. The infiltration enhancing and leaching test system for the low-permeability uranium-bearing sandstone according to claim 1, wherein the reaction device comprises a reaction tank (44) for containing the sample, a second flange (48) for sealing air inlet and water inlet pipes is detachably connected to the top of the reaction tank (44), the reaction tank (44) comprises a shell and a liner (49) arranged inside the shell, a gap facilitating outflow of the leaching solution is formed between the liner (49) and the shell, the liner (49) comprises two hollow semi-cylinders which are mutually buckled to form a cylinder, and a plurality of meshes for achieving uniform contact of the leaching solution and the sample are uniformly distributed on the wall of the liner (49).

3. The test system for the permeability-increasing leaching of the low-permeability uranium-bearing sandstone according to claim 2, wherein a bottom of the shell is provided with a plug (45) and a liquid extraction device (27), and the liquid extraction device (27) is used for extracting part of leachate from the reaction tank (44) for measurement during the test.

4. The permeability-increasing leaching test system for the low-permeability uranium-bearing sandstone according to claim 3, wherein the liquid taking device (27) comprises a liquid taking hole formed in the bottom of the shell, and a valve for controlling the on-off of liquid is connected to the liquid taking hole in a threaded manner.

5. The infiltration-enhancing leaching test system for the low-permeability uranium-bearing sandstone according to claim 2, wherein a plurality of projections for supporting the liner (49) are arranged in the gap, and the side of the projection, which faces away from the liner (49), is fixedly connected with the inner wall of the shell.

6. The system for the permeability-increasing leaching test of the low-permeability uranium-bearing sandstone according to claim 2, wherein the heating device comprises a heating tank (47) sleeved outside the reaction tank (44), heating wires are uniformly arranged in the heating tank (47), the heating wires are electrically connected with a temperature controller (40), and the temperature controller (40) is electrically connected with a power supply through a control switch.

7. The test system for the permeability-increasing leaching of the low-permeability uranium-bearing sandstone according to claim 6, wherein the heating tank (47) is arranged on a supporting device, the supporting device comprises a first bracket (25) fixedly connected with the heating tank (47), and the first bracket (25) is fixedly connected with a base (22) arranged below the first bracket.

8. The infiltration-enhancing leaching test system for the low-permeability uranium-bearing sandstone according to claim 2, wherein the water supply system comprises a water supply unit, an oxygen supply unit, a carbon dioxide gas supply unit and an air inlet unit, the water supply unit is used for supplying test water into the inner container (49), the carbon dioxide gas supply unit is used for supplying carbon dioxide gas required by the test into the inner container (49), and the oxygen supply unit is used for supplying oxygen gas with the flow rate required by the test into the inner container (49); the water supply unit comprises a liquid injection tank (9), the liquid injection tank (9) is communicated with the inner container (49), and a second stop valve (8) is arranged on a pipeline between the liquid injection tank (9) and the inner container (49); the carbon dioxide gas supply unit comprises a carbon dioxide high-pressure gas cylinder (1), an outlet of the carbon dioxide high-pressure gas cylinder (1) is sequentially connected with a first reducing valve (3), a first flowmeter (5), a first booster pump (29) and a first check valve (32), and the first check valve (32) is communicated with the inner part of the inner container (49); the air inlet unit comprises a first stop valve (6) connected between a first flowmeter (5) and a first booster pump (29) through a tee joint, and the first stop valve (6) is communicated with the air compressor (7); the oxygen supply unit comprises an oxygen high-pressure gas cylinder (2), an outlet of the oxygen high-pressure gas cylinder (2) is sequentially connected with a second reducing valve (4), a second flowmeter (31), a second booster pump (30) and a second check valve (28), and the second check valve (28) is communicated with the inner container (49) in the inner container.

9. The infiltration-enhancing leaching test system for low-permeability uranium-bearing sandstone according to claim 7, wherein the high-low frequency excitation system comprises an ultrasonic vibrator (24) for applying high-frequency vibration action required by the test to the reaction device and a low-frequency vibration exciter (39) for applying low-frequency vibration action required by the test to the reaction device; the ultrasonic vibrator (24) is electrically connected with the ultrasonic generator (41), the ultrasonic vibrator (24) is fixedly connected with a first flange (43), and the first flange (43) is detachably connected to the bottom of the heating tank (47); the low-frequency vibration exciter is a low-frequency vibration exciter (39) fixedly connected to a second bracket (21), and the second bracket (21) is fixedly connected with the base (22); the low-frequency vibration exciter is characterized in that a vibration control device is connected to the low-frequency vibration exciter (39), the vibration control device comprises a power amplifier (37) electrically connected with the low-frequency vibration exciter (39), the power amplifier (37) is electrically connected with a sweep frequency signal generator (38), and the low-frequency vibration exciter (39) is fixedly connected with the first support (25).

10. The system for testing the permeability-increasing leaching of the low-permeability uranium-bearing sandstone according to claim 7, wherein the data acquisition system comprises a force sensor (23) arranged on a first bracket (25), the force sensor (23) is electrically connected with a charge amplifier (35), and the charge amplifier (35) is electrically connected with a data collector (36); the data acquisition system also comprises a second barometer (33) and a pressure sensor (34) which are arranged on the reaction tank (44) and used for measuring the internal pressure of the reaction tank (44); the data acquisition system further comprises a gas collection tank (20), a first barometer (19) is arranged on the gas collection tank (20), the gas collection tank (20) is sequentially connected with a fifth stop valve (14), a filter (11) and a third stop valve (10), the third stop valve (10) is connected with a reaction tank (44), a vacuum pump (12), a fourth stop valve (13) and a third pressure reducing valve (15) are further connected to a pipeline between the fifth stop valve (14) and the filter (11) through five-way connections, the fourth stop valve (13) is communicated with the atmosphere, and the third pressure reducing valve (15) is connected with the gas collection tank (20); the gas collecting tank (20) is sequentially connected with the pressure reducing valve IV (18) and the flowmeter III (16) through pipelines and then communicated with the radon measuring instrument (17).