Deep filtering device and method for in-situ leaching uranium mining surface leachate

Abstract

The invention provides a deep filtering device and method for in-situ leaching uranium mining surface leachate, and relates to the technical field of in-situ leaching uranium mining, the deep filtering device comprises a liquid collecting tank, the liquid collecting tank is composed of a hollow cylinder and a hemispherical seal head, and the liquid collecting tank is provided with a liquid collecting tank liquid inlet pipe, a liquid collecting tank blow-off pipe and a liquid collecting tank liquid outlet pipe; the fiber ball filter is composed of a hollow cylinder and two hemispherical seal heads, a fiber ball filter liquid inlet pipe and a fiber ball filter liquid outlet pipe are arranged on the fiber ball filter, and the liquid collecting tank liquid outlet pipe is fixedly connected with the fiber ball filter liquid inlet pipe through a stock solution pump. According to the invention, the lixivium is input into the liquid collecting tank, pre-separation of particulate matters and fluid is realized under the action of gravity, then the fluid flows to the fiber ball filter filled with a high polymer material, efficient solid removal is realized, solid removal is enhanced by coupling the action of gravity-deep filtration, the solid-liquid separation efficiency of the lixivium can be effectively improved, and the filtration cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of in-situ uranium leaching, and in particular to a deep filtering device and method for surface leaching solution of in-situ uranium leaching. Background Art

[0002] At present, the commonly used filtering equipment in the in-situ leaching uranium process includes a combination of bag filters and sand filter towers. However, when the bag filter is used alone, it is difficult to separate fine particles such as silt and clay. These particles will not only interfere with the subsequent hydrometallurgical process, but may also flow back to the injection well with the tailings, exacerbating the blockage problem; although the use of high-precision filter bags can improve the interception effect, this will greatly reduce the processing flow. Once the filter bag is blocked, it will also increase the system pressure and reduce the injection efficiency. On the other hand, although the sand filter tower performs well in processing capacity and filtration accuracy, its equipment is large in size, high in cost, and requires regular backwashing, which not only increases the complexity of operation, but also the treatment of radioactive wastewater generated by backwashing is also a problem. In general, the performance of existing solid-liquid separation technologies is relatively backward, and there are deficiencies in efficiency and cost. Summary of the invention

[0003] The purpose of the present invention is to provide a deep filtering device and method for surface leaching solution of uranium in situ leaching to improve the above problems. In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0004] In a first aspect, the present application provides a deep filtration device for surface leaching solution of uranium in situ leaching, characterized in that it comprises:

[0005] A liquid collecting tank, the liquid collecting tank is composed of a hollow cylinder and a hemispherical head, the liquid collecting tank is provided with a liquid collecting tank liquid inlet pipe, a liquid collecting tank sewage pipe and a liquid collecting tank liquid outlet pipe, and the liquid collecting tank sewage pipe is set at a height lower than the liquid collecting tank liquid outlet pipe;

[0006] A fiber ball filter, the fiber ball filter is composed of a hollow cylinder and two hemispherical heads, the fiber ball filter is provided with a fiber ball filter liquid inlet pipe and a fiber ball filter liquid outlet pipe, the liquid collection tank liquid outlet pipe is fixedly connected to the fiber ball filter liquid inlet pipe through a raw liquid pump.

[0007] Furthermore, the liquid collecting tank is provided with a radon and radon daughter discharge pipe, the liquid collecting tank liquid inlet pipe is provided with a liquid collecting tank liquid inlet valve, the liquid collecting tank sewage pipe is provided with a liquid collecting tank sewage valve, and the liquid collecting tank liquid outlet pipe is provided with a liquid collecting tank liquid outlet valve and a pre-pump valve.

[0008] Furthermore, the fiber ball filter liquid inlet pipe is sequentially provided with a post-pump valve, an inlet valve and an inlet pressure gauge, the inlet pressure gauge is arranged at one end close to the fiber ball filter, the fiber ball filter liquid outlet pipe is sequentially provided with a filtered liquid valve, an outlet pressure gauge and a flow meter, the filtered liquid valve is arranged at one end close to the fiber ball filter, and a fiber ball height monitoring device is arranged inside the fiber ball filter.

[0009] Furthermore, the fiber ball filter includes a bypass pipe and a backwash pipe, the bypass pipe is provided with a bypass valve, one end of the bypass pipe is fixedly connected to one end of the fiber ball filter liquid inlet pipe close to the raw liquid pump, and the other end of the bypass pipe is fixedly connected to one end of the fiber ball filter liquid outlet pipe away from the fiber ball filter;

[0010] The backwash pipe includes an upper pipe and a lower pipe, the upper pipe is fixedly connected to the hemispherical head at the top of the fiber ball filter, and a backwash pipe valve is arranged on the upper pipe, the lower pipe is fixedly connected to the hemispherical head at the bottom of the fiber ball filter, and a backwash liquid valve is arranged on the lower pipe.

[0011] Furthermore, fiber balls 7 made of polymer material are placed inside the fiber ball filter, and the volume occupied by the fiber balls is 1 / 2 to 2 / 3 of the volume of the fiber ball filter.

[0012] In a second aspect, the present application also provides a deep filtration method for surface leaching solution of uranium in situ leaching, comprising:

[0013] All valves are set to the first switch state and the raw liquid pump is turned on, and the volume and flow rate of the filtered fluid of the fiber ball filter are collected based on the flow meter, wherein the first switch state includes closing the bypass valve, the backwash pipe valve and the backwash liquid valve, and opening the liquid collection tank inlet valve, the liquid collection tank outlet valve, the pump front valve, the pipe inlet valve and the filtered liquid valve;

[0014] Collecting fiber ball height values ​​based on a fiber ball height monitoring device;

[0015] Calculating a flow ratio based on the filtered fluid volume and the fiber ball height value, wherein the flow ratio is used to characterize the operating load and cumulative processing capacity of the fiber ball filter;

[0016] When the flow ratio is greater than a set threshold, pressure values ​​are collected based on the inlet pressure gauge and the outlet pressure gauge to obtain a first pressure value and a second pressure value;

[0017] Calculate the flushing pressure based on the first pressure value, the second pressure value and the flow rate;

[0018] Calculate the flushing time based on the first pressure value and the second pressure value;

[0019] The fiber balls in the fiber ball filter are periodically flushed based on the flushing pressure and the flushing time.

[0020] The beneficial effects of the present invention are:

[0021] The present invention achieves pre-separation of particulate matter and fluid by inputting the leachate into a liquid collecting tank through the action of gravity, and then flows the fluid to a fiber ball filter filled with a polymer material to achieve efficient solid removal. The solid removal is enhanced by coupling the "gravity-deep filtration" effect, which can effectively improve the solid-liquid separation efficiency of the leachate and reduce the filtration cost.

[0022] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or be understood by implementing the embodiments of the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a schematic structural diagram of a deep filter device for surface leaching solution of uranium in situ leaching according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the deep filtration method for surface leaching solution of uranium in situ leaching described in an embodiment of the present invention;

[0026] Figure 3 Schematic diagram of the median particle size of residual particles in the filtrate of the fiber ball filter described in an embodiment of the present invention.

[0027] Markings in the figure:

[0028] 1. Liquid collecting tank; 2. Liquid inlet pipe of liquid collecting tank; 3. Drain pipe of liquid collecting tank; 4. Liquid outlet pipe of liquid collecting tank; 5. Radon and radon daughter discharge pipe; 6. Liquid inlet valve of liquid collecting tank; 7. Drain valve of liquid collecting tank; 8. Liquid outlet valve of liquid collecting tank; 9. Valve before pump; 10. Raw liquid pump; 11. Valve after pump; 12. Inlet valve; 13. Inlet pressure gauge; 14. Liquid inlet pipe of fiber ball filter; 15. Bypass pipe; 16. Bypass valve; 17. Liquid outlet pipe of fiber ball filter; 18. Filtered liquid valve; 19. Outlet pressure gauge; 20. Flow meter; 21. Upper pipe; 22. Recoil pipe valve; 23. Lower pipe; 24. Recoil liquid valve; 25. Fiber ball height monitoring device; 26. Fiber ball filter. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0031] Embodiment 1:

[0032] This embodiment provides a deep filter device for surface leaching solution of uranium in situ leaching, see Figure 1 .

[0033] The liquid collecting tank 1 is composed of a hollow cylinder and a hemispherical head. The liquid collecting tank 1 is provided with a liquid collecting tank liquid inlet pipe 2, a liquid collecting tank sewage pipe 3 and a liquid collecting tank liquid outlet pipe 4. The liquid collecting tank sewage pipe 3 is set at a height lower than the liquid collecting tank liquid outlet pipe 4.

[0034] The fiber ball filter 26 is composed of a hollow cylinder and two hemispherical heads. The fiber ball filter 26 is provided with a fiber ball filter liquid inlet pipe 14 and a fiber ball filter liquid outlet pipe 17. The liquid collecting tank liquid outlet pipe 4 is fixedly connected to the fiber ball filter liquid inlet pipe 14 through a raw liquid pump 10.

[0035] In the embodiment of the present application, the liquid collecting tank 1 is made of fiberglass or carbon steel, and is provided with a liquid level gauge; the fiber ball filter 26 has a "cylinder + end cap" structure, and is filled with fiber balls made of a polymer material.

[0036] The deep filtration of the leachate includes two stages: gravity pre-separation of solid particles in the leachate and deep filtration separation, wherein the liquid collecting tank 1 is used as a device for gravity pre-separation, and the fiber ball filter 26 is used as a device for deep filtration separation.

[0037] The liquid collecting tank 1 is provided with a radon and radon daughter discharge pipe 5, the liquid collecting tank liquid inlet pipe 2 is provided with a liquid collecting tank liquid inlet valve 6, the liquid collecting tank sewage pipe 3 is provided with a liquid collecting tank sewage valve 7, and the liquid collecting tank liquid outlet pipe 4 is provided with a liquid collecting tank liquid outlet valve 8 and a pump front valve 9;

[0038] In the embodiment of the present application, the radon and radon progeny discharge pipe 5 is used to discharge harmful gases such as radon and radon progeny that may be generated in the liquid collecting tank 1 in real time; the liquid inlet valve 6 of the liquid collecting tank can accurately control the speed and flow rate of the liquid flowing into the liquid collecting tank 1, and adjust it according to actual needs, thereby ensuring the orderliness and controllability of the liquid inlet process; the liquid collecting tank sewage discharge valve 7 is only opened when the liquid collecting tank 1 needs to perform sewage discharge operation; the liquid collecting tank liquid outlet valve 8 and the pump front valve 9 cooperate with each other to control the flow rate and timing of the liquid discharge from the liquid collecting tank 1.

[0039] The fiber ball filter liquid inlet pipe 14 is provided with a post-pump valve 11, an inlet valve 12 and an inlet pressure gauge 13 in sequence. The inlet pressure gauge 13 is arranged at one end close to the fiber ball filter 26. The fiber ball filter liquid outlet pipe 17 is provided with a filtered liquid valve 18, an outlet pressure gauge 19 and a flow meter 20 in sequence. The filtered liquid valve 18 is arranged at one end close to the fiber ball filter 26. A fiber ball height monitoring device 25 is arranged inside the fiber ball filter 26.

[0040] In the embodiment of the present application, the post-pump valve 11 is used to control the flow rate of the liquid after being pressurized by the raw liquid pump 10, ensuring that the liquid flow rate entering the fiber ball filter 26 is within an appropriate range, avoiding impact damage to the fiber ball filter 26 due to excessive flow rate, or affecting the filtration efficiency due to too slow flow rate; the inlet valve 12 further enhances the ability to regulate the incoming liquid, and can open or close the inlet channel at any time according to actual production needs; the filtered liquid valve 18 is usually in an open state, when it can control the outflow rate of the filtered liquid; the outlet pressure gauge 19 can monitor the pressure of the filtered liquid, and by comparing with the data of the inlet pressure gauge 13, it can be determined whether the working state of the fiber ball filter 26 is normal; the flow meter 20 accurately measures the flow rate of the filtered liquid.

[0041] The fiber ball height monitoring device 25 provided inside the fiber ball filter 26 monitors the stacking height of the fiber balls in real time. When the height of the fiber balls changes due to adsorption, retention, etc. during the filtration process, the operator can take corresponding measures in time according to the monitoring data, such as replenishing the fiber balls or performing backwashing operations, to ensure that the fiber ball filter 26 always maintains good filtration performance.

[0042] The fiber ball filter 26 includes a bypass pipe 15 and a backwash pipe. The bypass pipe 15 is provided with a bypass valve 16. One end of the bypass pipe 15 is fixedly connected to one end of the fiber ball filter liquid inlet pipe 14 close to the raw liquid pump 10, and the other end of the bypass pipe 15 is fixedly connected to one end of the fiber ball filter liquid outlet pipe 17 away from the fiber ball filter 26.

[0043] The backwash pipe includes an upper pipe 21 and a lower pipe 23. The upper pipe 21 is fixedly connected to the hemispherical head at the top of the fiber ball filter 26. A backwash pipe valve 22 is provided on the upper pipe 21. The lower pipe 23 is fixedly connected to the hemispherical head at the bottom of the fiber ball filter 26. A backwash liquid valve 24 is provided on the lower pipe 23.

[0044] In the implementation of this application, the leachate in the fiber ball filter 26 enters from the top and exits from the bottom, and the backwash liquid enters from the bottom and exits from the top, that is, the fiber ball filter 26 contains two pipelines at the top, each pipeline is equipped with an electromagnetic valve, and the bottom of the tower contains two pipelines, each pipeline is equipped with an electromagnetic valve.

[0045] Fiber balls made of polymer materials are placed inside the fiber ball filter 26 , and the volume occupied by the fiber balls is 1 / 2 to 2 / 3 of the fiber ball filter 26 .

[0046] In the embodiment of the present application, the fiber ball is a single filament that eliminates the charge and is wound into a firmly fixed fiber bundle, which has a large specific surface area, is smooth and unobstructed during operation, does not shed hair, does not escape, and is easy to backwash clean. The fiber ball filling volume occupies 1 / 2 to 2 / 3 of the fiber ball filter 26. A certain space is left at the upper end of the fiber ball filter 26 so that the fiber balls can roll up and down during the backwashing operation to enhance the backwashing effect.

[0047] Embodiment 2:

[0048] This embodiment provides a deep filtering method for surface leachate of uranium in situ leaching.

[0049] See also Figure 2 , the figure shows that the method includes step S10, step S20, step S30, step S40, step S50, step S60 and step S70:

[0050] Step S10. Set all valves to the first switch state and turn on the raw liquid pump 10, and collect the volume and flow rate of the filtered fluid of the fiber ball filter 26 based on the flow meter 20. The first switch state includes closing the bypass valve 16, the backwash pipe valve 22 and the backwash liquid valve 24, and opening the liquid collection tank inlet valve 6, the liquid collection tank outlet valve 8, the pump front valve 9, the pipe inlet valve 12 and the filtered liquid valve 18;

[0051] Step S20. Collecting the fiber ball height value based on the fiber ball height monitoring device 25;

[0052] Step S30. Calculate the flow ratio based on the volume of the filtered fluid and the fiber ball height value, the flow ratio is used to characterize the operating load and cumulative processing capacity of the fiber ball filter 26;

[0053] Specifically, step S30 specifically includes step S31, step S32 and step S33:

[0054] Step S31. Obtaining the bottom radius of the fiber ball filter 26;

[0055] Step S32. Calculate the fiber ball filling volume based on the bottom radius and the fiber ball height value;

[0056] Step S33. Calculate the ratio of the fluid volume to the fiber ball filling volume to obtain the flow ratio;

[0057] Specifically, a flow meter 20 is provided on the liquid outlet pipe 17 of the fiber ball filter to monitor the fluid flow rate Q in real time. x (m 3 / h), and calculate the cumulative fluid volume V passing through the fiber ball filter 26 total (m 3 / h):

[0058]

[0059] Wherein, T is the working time of the fiber ball filter 26; Q x is the fluid flow rate; V total is the volume of the fluid.

[0060] The calculation formula of the current ratio is:

[0061]

[0062] Among them, K is the current ratio; V total is the volume of the fluid; V x Fill the volume for the fiber ball.

[0063] Step S40. When the flow ratio is greater than the set threshold, pressure values ​​are collected based on the inlet pressure gauge 13 and the outlet pressure gauge 19 to obtain a first pressure value and a second pressure value;

[0064] Specifically, the flow ratio reflects the relationship between the total amount of fluid processed by the fiber ball filter 26 within a certain period of time and the volume of the filler in the filter, and can intuitively evaluate the operating status and service life of the fiber ball filter 26. When the flow ratio exceeds the set threshold, it indicates that the fiber ball filter 26 has been running for too long, and the fiber balls in the fiber ball filter 26 begin to become clogged or the filtration efficiency decreases, and the fiber ball flushing treatment is required at this time.

[0065] Step S50. Calculate the flushing pressure based on the first pressure value, the second pressure value and the flow rate;

[0066] Specifically, step S50 specifically includes step S51, step S52, step S53, step S54, step S55, step S56 and step S57:

[0067] Step S51. Obtaining a preset flow rate upper limit value and a flow rate lower limit value;

[0068] Step S52: Calculate the difference between the flow rate and the flow rate upper limit to obtain a first value;

[0069] Step S53. Calculate the difference between the lower flow rate limit and the upper flow rate limit to obtain a second value;

[0070] Step S54. Calculate the absolute value of the ratio of the first value to the second value to obtain a third value;

[0071] Step S55. Calculate the difference between the first pressure value and the second pressure value to obtain a fourth value;

[0072] Step S56. Calculate the ratio of the fourth value to the second pressure value to obtain a fifth value;

[0073] Step S57. Calculate the product of the fifth value and the third value to obtain the flushing pressure;

[0074] Specifically, in the present application, the flushing pressure of the fiber ball filter 26 is calculated by comprehensively considering the flow rate and the pressure value, and the corresponding calculation formula is:

[0075]

[0076] Among them, P C is the flushing pressure; v x is the flow velocity; v u is the upper limit of flow rate; v d is the lower limit of flow rate; P1 is the first pressure value; P2 is the second pressure value.

[0077] Step S60. Calculate the flushing time based on the first pressure value and the second pressure value;

[0078] Specifically, step S60 specifically includes step S61, step S62, step S63, step S64 and step S65:

[0079] Step S61. Obtaining a preset flushing time;

[0080] Step S62. Calculate the ratio of the second pressure value to the first pressure value to obtain a sixth value;

[0081] Step S63. Calculate the reciprocal of the natural constant as the base, and the sixth value as the exponential function value of the variable to obtain the seventh value;

[0082] Step S64: Calculate the product of the seventh value and the preset flushing time to obtain the adjusted time;

[0083] Step S65. Calculate the sum of the preset flushing time and the adjusted time to obtain the flushing time;

[0084] Specifically, the flushing time calculation formula is:

[0085]

[0086] Where, T is the flushing time; T c is the preset flushing time; P1 is the first pressure value; P2 is the second pressure value.

[0087] Step S70. Periodically flush the fiber balls 27 in the fiber ball filter 26 based on the flushing pressure and flushing duration;

[0088] Specifically, step S70 specifically includes step S71, step S72, step S73, step S74 and step S75:

[0089] Step S71. Set all valves to the second switch state, and open the backwash pipe to flush the fiber ball 27 based on the flushing pressure and flushing duration. The second switch state includes closing the liquid collection tank inlet valve 6, the liquid collection tank outlet valve 8, the pump front valve 9, the pipe inlet valve 12 and the filtered liquid valve 18, and opening the bypass valve 16, the backwash pipe valve 22 and the backwash liquid valve 24;

[0090] Step S72. After the flushing is completed, the flow ratio after the flushing is calculated based on the fluid volume and the current fiber ball height value;

[0091] Step S73. When the flow rate after flushing is not greater than the set threshold, all valves are set to the first switch state to perform deep filtration of the in situ leaching uranium leachate;

[0092] Step S74. When the flow rate after flushing is greater than the set threshold, a preset flushing pressure is obtained;

[0093] Step S75. Flushing the fiber ball 27 based on a preset flushing pressure and a preset flushing time;

[0094] Specifically, after the fiber balls in the fiber ball filter 26 are flushed for the first time, the flow ratio after flushing needs to be calculated again. When the flow ratio after flushing is not greater than the set threshold, the deep filtration of the in situ leaching uranium leachate can continue; when the flow ratio after flushing is still greater than the set threshold, it means that the first flushing is not completely clean. At this time, a second flushing is performed based on the pre-set flushing pressure and flushing time to ensure that the fiber ball filter 26 is always maintained in a good filtering state.

[0095] The clear liquid obtained by deep filtration of the fiber ball filter 26 is subjected to quality inspection by an online particle size detection device. Unqualified clear liquid needs to be returned to the fiber ball filter 26 for deep filtration again, and qualified clear liquid is sent to the ion exchange system for further processing.

[0096] Embodiment 3:

[0097] The particle size of the unfiltered leaching solution from a mine in Xinjiang was tested. The average particle size of the particles in the solution was d p = 104.9 μm, using the existing bag filter, the average particle size of the particles remaining after filtration is d p =4.1μm; using the deep filtration method of the present application, the fiber ball filter 26 is used to replace the bag filter, and the average particle size of the residual particles after filtration is d p =2.9μm.

[0098] The actual test results prove the excellent performance of the fiber ball filter 26 in improving the filtering effect. As shown in Table 1, it is the process data of a uranium mine in Xinjiang. 10 d50 and d 90 are three key statistical parameters of particle size distribution, which represent specific percentiles of the cumulative particle size distribution, such as d 10 It means that in the particle size distribution, 10% of the particles have diameters smaller than this value.

[0099] Table 1 Process data of a uranium mine in Xinjiang (leaching solution flow rate: 22m3 / h)

[0100]

[0101] As can be seen from Table 1, the particle size range of the particles after treatment by the fiber ball filter 26 is narrower, 1.170-23.96 μm, which is more precise in controlling the particle size than the 0.748-26.79 μm of the bag filter; and the average particle size is smaller, indicating that the fiber ball filter can more effectively remove smaller particles and improve the purity of the leachate.

[0102] The clear liquid after deep filtration using fiber ball filter 26 10 The value is 1.703μm, which is larger than the 1.586μm of the bag filter, indicating that in the particle size distribution, the fiber ball filter 26 allows more smaller particles to be effectively filtered, making the proportion of particles smaller than this value relatively low, and the filtering effect is more stable. 50 The value is 2.449μm, which is smaller than the 3.632μm of the bag filter, which reflects the advantage of the fiber ball filter 26 in processing medium-sized particles and can better control the intermediate distribution state of particles. 90 The value is 3.594μm, which is much smaller than the 10.70μm of the bag filter, indicating that the fiber ball filter 26 has a stronger ability to remove larger particles and can effectively prevent the adverse effects of large particles on subsequent processes. Therefore, it can be seen that the fiber ball filter 26 has obvious advantages in particle size control and particle distribution processing when filtering the leachate compared to the bag filter, and can perform filtering processing more efficiently.

[0103] Embodiment 4:

[0104] The examples of the present application provide a filtration performance analysis of fiber balls.

[0105] like Figure 3 As shown, the performance of the fiber ball filter 26 does not decrease with the running time. The dimensionless bed height in the figure is The definition is the height of the fiber ball bed. The higher the height of the fiber ball bed, the better the filtration effect. The fiber ball filter 26 has a sustained and stable filtration performance due to its deep filtration characteristics, that is, the filtration effect occurs not only on the surface of the medium, but also in the pores of the entire medium.

[0106] In the actual filtering process, impurity particles must pass through the slender and tortuous channels formed by the pores of the filter medium. Since the size of the impurity particles is much smaller than the internal pores of the medium, the particles are effectively trapped in the channels and distributed in the longitudinal depth of the filter material. In these tiny channels, the impurity particles carried by the fluid are pushed to the channel wall under the action of fluid dynamics. The combined effect of static electricity and surface tension makes these particles finally adhere to the channel wall, ensuring high-efficiency filtration.

[0107] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0108] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A deep filter device for surface leaching solution of uranium in situ leaching, characterized in that: include: A liquid collecting tank (1), the liquid collecting tank (1) being composed of a hollow cylinder and a hemispherical end cap, the liquid collecting tank (1) being provided with a liquid collecting tank liquid inlet pipe (2), a liquid collecting tank sewage pipe (3) and a liquid collecting tank liquid outlet pipe (4), the liquid collecting tank sewage pipe (3) being arranged at a height lower than the liquid collecting tank liquid outlet pipe (4); A fiber ball filter (26), the fiber ball filter (26) consisting of a hollow cylinder and two hemispherical heads, the fiber ball filter (26) being provided with a fiber ball filter liquid inlet pipe (14) and a fiber ball filter liquid outlet pipe (17), the liquid collecting tank liquid outlet pipe (4) being fixedly connected to the fiber ball filter liquid inlet pipe (14) via a raw liquid pump (10).

2. The deep filter device for in-situ leaching of uranium surface leachate according to claim 1, characterized in that The liquid collecting tank (1) is provided with a radon and radon daughter discharge pipe (5), the liquid collecting tank liquid inlet pipe (2) is provided with a liquid collecting tank liquid inlet valve (6), the liquid collecting tank sewage pipe (3) is provided with a liquid collecting tank sewage valve (7), and the liquid collecting tank liquid outlet pipe (4) is provided with a liquid collecting tank liquid outlet valve (8) and a pump front valve (9).

3. The deep filter device for in-situ leaching of uranium surface leachate according to claim 1, characterized in that The fiber ball filter liquid inlet pipe (14) is provided with a post-pump valve (11), a pipe inlet valve (12) and a pipe inlet pressure gauge (13) in sequence, and the pipe inlet pressure gauge (13) is provided at one end close to the fiber ball filter (26). The fiber ball filter liquid outlet pipe (17) is provided with a filtered liquid valve (18), a pipe outlet pressure gauge (19) and a flow meter (20) in sequence, and the filtered liquid valve (18) is provided at one end close to the fiber ball filter (26). A fiber ball height monitoring device (25) is provided inside the fiber ball filter (26).

4. The deep filter device for in-situ leaching of uranium surface leachate according to claim 1, characterized in that The fiber ball filter (26) comprises a bypass pipe (15) and a backwash pipe, the bypass pipe (15) is provided with a bypass valve (16), one end of the bypass pipe (15) is fixedly connected to one end of the fiber ball filter liquid inlet pipe (14) close to the raw liquid pump (10), and the other end of the bypass pipe (15) is fixedly connected to one end of the fiber ball filter liquid outlet pipe (17) away from the fiber ball filter (26); The backwashing pipeline comprises an upper pipeline (21) and a lower pipeline (23); the upper pipeline (21) is fixedly connected to the hemispherical head at the top of the fiber ball filter (26); a backwashing pipe valve (22) is arranged on the upper pipeline (21); the lower pipeline (23) is fixedly connected to the hemispherical head at the bottom of the fiber ball filter (26); and a backwashing liquid valve (24) is arranged on the lower pipeline (23).

5. The deep filter device for in situ leaching of uranium surface leachate according to claim 1, characterized in that Fiber balls (27) made of polymer material are placed inside the fiber ball filter (26), and the volume occupied by the fiber balls (27) is 1 / 2 to 2 / 3 of the volume of the fiber ball filter (26).

6. A deep filtration method for surface leaching solution of uranium in situ leaching, characterized in that: include: All valves are set to a first switch state and a raw liquid pump (10) is turned on, and the volume and flow rate of the filtered fluid of the fiber ball filter (26) are collected based on a flow meter (20), wherein the first switch state includes closing a bypass valve (16), a backwash pipe valve (22) and a backwash liquid valve (24), and opening a liquid collection tank inlet valve (6), a liquid collection tank outlet valve (8), a pump front valve (9), an inlet pipe valve (12) and a filtered liquid valve (18); Collecting fiber ball height values ​​based on a fiber ball height monitoring device (25); Calculating a flow ratio based on the filtered fluid volume and the fiber ball height value, wherein the flow ratio is used to characterize the operating load and cumulative processing capacity of the fiber ball filter (26); When the flow ratio is greater than a set threshold, pressure values ​​are collected based on an inlet pressure gauge (13) and an outlet pressure gauge (19) to obtain a first pressure value and a second pressure value; Calculate the flushing pressure based on the first pressure value, the second pressure value and the flow rate; Calculate the flushing time based on the first pressure value and the second pressure value; The fiber balls (27) in the fiber ball filter (26) are periodically flushed based on the flushing pressure and the flushing duration.

7. The deep filtration method of surface leaching solution of in situ uranium mining according to claim 6, characterized in that: Calculating the flow ratio based on the filtered fluid volume and the fiber ball height value includes: Obtaining the bottom radius of the fiber ball filter (26); The fiber ball filling volume is calculated based on the bottom radius and the fiber ball height value; The ratio of the fluid volume to the fiber ball filling volume is calculated to obtain the flow ratio.

8. The deep filtration method of surface leachate of in situ uranium mining according to claim 6, characterized in that: The flushing pressure is calculated based on the first pressure value, the second pressure value and the flow rate, including: Obtain the preset flow rate upper limit value and flow rate lower limit value; Calculate the difference between the flow rate and the upper limit of the flow rate to obtain a first value; Calculate the difference between the flow velocity lower limit value and the flow velocity upper limit value to obtain a second value; Calculate the absolute value of the ratio of the first value to the second value to obtain a third value; Calculating a difference between the first pressure value and the second pressure value to obtain a fourth value; Calculating a ratio of the fourth value to the second pressure value to obtain a fifth value; The product of the fifth value and the third value is calculated to obtain the flushing pressure.

9. The deep filtration method of surface leachate of in situ uranium mining according to claim 6, characterized in that: The flushing duration is calculated based on the first pressure value and the second pressure value, including: Get the preset flushing time; calculating a ratio of the second pressure value to the first pressure value to obtain a sixth value; The reciprocal of the natural constant is calculated as the base, and the sixth value is the exponential function value of the variable to obtain the seventh value; Calculate the product of the seventh value and the preset flushing time to obtain the adjusted time; The sum of the preset flushing time and the adjusted time is calculated to obtain the flushing time.

10. The deep filtration method of surface leachate of in situ uranium mining according to claim 9, characterized in that: The fiber balls (27) in the fiber ball filter (26) are periodically flushed based on the flushing pressure and the flushing duration, comprising: All valves are set to a second switch state, and the backwash pipe is opened correspondingly based on the flushing pressure and the flushing duration to flush the fiber ball (27), wherein the second switch state includes closing the liquid collection tank inlet valve (6), the liquid collection tank outlet valve (8), the pump front valve (9), the pipe inlet valve (12) and the filtered liquid valve (18), and opening the bypass valve (16), the backwash pipe valve (22) and the backwash liquid valve (24); After the flushing is completed, the flow ratio after the flushing is calculated based on the fluid volume and the current fiber ball height value; When the flow rate after flushing is not greater than the set threshold value, all valves are set to the first switch state to perform deep filtration of the in situ leaching uranium leachate; When the flow rate after flushing is greater than the set threshold, obtaining a preset flushing pressure; The fiber balls (27) are flushed based on the preset flushing pressure and the preset flushing time.

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