Filter bag cleaning device and cleaning method

Abstract

The invention discloses a filter bag cleaning device and a cleaning method, belongs to the technical field of in-situ leaching uranium mining, and mainly aims to recover the solution flux of a filter bag under the condition of not damaging the micro aperture structure of the filter bag. According to the main technical scheme, the filter bag cleaning device is used for cleaning a filter bag of a bag filter and comprises a first cleaning agent tank, a second cleaning agent tank and a clean water tank; a first cleaning agent is stored in the first cleaning agent tank, the first cleaning agent is used for dissolving a first type of precipitate attached to the filter bag, a second cleaning agent is stored in the second cleaning agent tank, and the second cleaning agent is used for dissolving a second type of precipitate attached to the filter bag; the first cleaning agent tank, the second cleaning agent tank and the clear water tank can be selectively communicated with the bag type filter; a liquid inlet valve and a liquid inlet pressure gauge are arranged on a liquid inlet pipe of the bag type filter, and a liquid outlet valve, a liquid outlet pressure gauge and a liquid outlet flow meter are arranged on a liquid outlet pipe of the bag type filter.

Description

Technical Field

[0001] This application belongs to the field of in-situ leaching uranium mining technology, specifically relating to a filter bag cleaning device and cleaning method. Background Technology

[0002] In related technologies, the cleaning methods used for chemical precipitates adhering to the filter bags of bag filters used in in-situ uranium leaching are low-pressure backwashing with clean water or agitation cleaning with a cleaning machine. These cleaning methods not only have poor cleaning effects but also easily cause irreversible damage to the micropore structure of the filter bags, thereby affecting the filtration accuracy and service life of the filter bags. Summary of the Invention

[0003] In view of this, this application provides a filter bag cleaning device and cleaning method, the main purpose of which is to restore the solution flux of the filter bag without damaging the micropore structure of the filter bag.

[0004] To achieve the above objectives, this application mainly provides the following technical solutions: One aspect of this application provides a filter bag cleaning device for cleaning the filter bags of a bag filter, comprising a first cleaning agent tank, a second cleaning agent tank, and a clean water tank; the first cleaning agent tank stores a first cleaning agent, which is used to dissolve a first type of precipitate adhering to the filter bag; the second cleaning agent tank stores a second cleaning agent, which is used to dissolve a second type of precipitate adhering to the filter bag; the first cleaning agent tank, the second cleaning agent tank, and the clean water tank are all selectively connected to the bag filter; the inlet pipe of the bag filter is equipped with an inlet valve and an inlet pressure gauge, and the outlet pipe of the bag filter is equipped with an outlet valve, an outlet pressure gauge, and an outlet flow meter.

[0005] Optionally, the filter bag cleaning device further includes an air compressor, which is connected to the bag filter, and an air inlet valve is provided on the connecting pipeline between the air compressor and the bag filter.

[0006] Optionally, the filter bag cleaning device further includes an automatic exhaust valve, which is connected to the bag filter.

[0007] Optionally, the filter bag cleaning device further includes a waste liquid pipe, a waste liquid valve, and a waste liquid tank; one end of the waste liquid pipe is connected to the bag filter, and the other end is connected to the waste liquid tank, and the waste liquid valve is disposed on the waste liquid pipe.

[0008] Optionally, the filter bag cleaning device further includes cleaning branch pipes and a cleaning main pipe; there are multiple cleaning branch pipes, one end of each cleaning branch pipe is connected to the first cleaning agent tank, the second cleaning agent tank and the clean water tank respectively, and the other end of each cleaning branch pipe is connected to one end of the cleaning main pipe, and the other end of the cleaning main pipe is connected to the bag filter.

[0009] Optionally, a first cleaning agent valve is provided on the cleaning branch pipe connected to the first cleaning agent tank, a second cleaning agent valve is provided on the cleaning branch pipe connected to the second cleaning agent tank, a clean water valve is provided on the cleaning branch pipe connected to the clean water tank, and a main cleaning valve is provided on the main cleaning pipe.

[0010] Optionally, a cleaning pump is also provided on the main cleaning pipe.

[0011] Optionally, the cleaning manifold is also equipped with a cleaning medium flow meter.

[0012] Another aspect of this application provides a filter bag cleaning method, employing the filter bag cleaning apparatus described in any one of the above claims, the filter bag cleaning method comprising: The outlet flow rate and inlet / outlet hydraulic pressure difference of the bag filter are acquired in real time. When the outlet flow rate of the bag filter drops to below 90% of the initial flow rate, and / or the inlet and outlet pressure difference is greater than 0.05 MPa, close the inlet valve and the outlet valve of the bag filter to drain the residual medium in the bag filter. The first cleaning agent tank is connected to the bag filter. The first cleaning agent is introduced into the bag filter. After the first cleaning agent fills the bag filter and the filter bag is completely submerged, the introduction of the first cleaning agent is stopped. The filter bag is kept completely submerged for a first preset time. After the submersion is completed, the waste liquid of the first cleaning agent in the bag filter is drained. Control the connection between the clean water tank and the bag filter, and introduce clean water into the bag filter for rinsing until the pH value of the wash water in the bag filter rises to the first preset range, then stop introducing clean water and drain the wash water from the bag filter. Reopen the inlet valve and outlet valve of the bag filter, and obtain the outlet flow rate and inlet / outlet pressure difference of the bag filter again; When the re-obtained outflow rate is still below 90% of the initial flow rate, and / or the inlet and outlet pressure difference is still greater than 0.05 MPa, close the inlet valve and outlet valve of the bag filter to drain the residual medium in the bag filter; then control the second cleaning agent tank to connect with the bag filter, and introduce the second cleaning agent into the bag filter. After the second cleaning agent fills the bag filter and the filter bag is completely submerged, stop introducing the second cleaning agent and keep the filter bag completely submerged for a second preset time. After the submersion is completed, drain the waste liquid of the second cleaning agent in the bag filter. Reconnect the clean water tank to the bag filter and flush the bag filter with clean water until the pH value of the wash water in the bag filter drops to the second preset range. Stop flushing with clean water and drain the wash water from the bag filter. Reopen the inlet valve and the outlet valve of the bag filter.

[0013] Optionally, the first cleaning agent is an acidic solution capable of dissolving hydroxide precipitates, and the second cleaning agent is an alkaline solution capable of dissolving silica precipitates.

[0014] By employing the above technical solution, this application has at least the following beneficial effects: The filter bag cleaning device and method provided in this application, by setting up a first cleaning agent tank and a second cleaning agent tank to store a first cleaning agent and a second cleaning agent respectively, as well as a clean water tank, and the first cleaning agent tank, the second cleaning agent tank and the clean water tank can all be selectively connected to the bag filter. The first cleaning agent can be used to specifically dissolve the first type of precipitate attached to the filter bag, and the second cleaning agent can be used to specifically dissolve the second type of precipitate attached to the filter bag. With the help of the clean water tank, the subsequent rinsing operation is completed, which effectively improves the cleaning effect of the filter bag, while avoiding irreversible damage to the micropore structure of the filter bag, thereby ensuring the filtration accuracy of the filter bag and extending the service life of the filter bag. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the filter bag cleaning device according to an optional embodiment of this application; Figure 2 This is a flowchart of a filter bag cleaning method according to an optional embodiment of this application.

[0016] The reference numerals in the attached figures are as follows: 100. Bag filter; 101. Filter bag; 1. First cleaning agent tank; 2. Second cleaning agent tank; 3. Clean water tank; 4. Inlet pipe; 5. Outlet pipe; 6. Cleaning branch pipe; 7. Cleaning main pipe; 8. Waste liquid pipe; 9. Inlet valve; 10. Outlet valve; 11. Inlet pressure gauge; 12. Outlet pressure gauge; 13. First cleaning agent valve; 14. Second cleaning agent valve; 15. Clean water valve; 16. Cleaning main valve; 17. Air inlet valve; 18. Automatic exhaust valve; 19. Waste liquid valve; 20. Cleaning pump; 21. Outlet flow meter; 22. Cleaning medium flow meter; 23. Air compressor; 24. Waste liquid pool. Detailed Implementation

[0017] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0019] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0020] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0021] See Figure 1As shown, according to an embodiment of this application, a filter bag 101 cleaning device is provided, applied to a bag filter 100 in in-situ leaching uranium mining, for cleaning chemical precipitates attached to the filter bags 101 of the bag filter 100, including a first cleaning agent tank 1, a second cleaning agent tank 2, and a clean water tank 3; the first cleaning agent tank 1 stores a first cleaning agent, which is used to dissolve a first type of precipitate attached to the filter bags 101, and the second cleaning agent tank 2 stores a second cleaning agent, which is used to dissolve a second type of precipitate attached to the filter bags 101; the first cleaning agent tank 1, the second cleaning agent tank 2, and the clean water tank 3 can all be selectively connected to the bag filter 100; the inlet pipe 4 of the bag filter 100 is provided with an inlet valve 9 and an inlet pressure gauge 11, and the outlet pipe 5 of the bag filter 100 is provided with an outlet valve 10, an outlet pressure gauge 12, and an outlet flow meter 21.

[0022] The filter bag 101 cleaning device provided in this embodiment of the application, by setting a first cleaning agent tank 1 and a second cleaning agent tank 2 to store a first cleaning agent and a second cleaning agent respectively, can specifically dissolve the first type of precipitate and the second type of precipitate attached to the filter bag 101. With the help of a clean water tank 3 that can be selectively connected to the bag filter 100, the cleaning agent cleaning and clean water rinsing are coordinated in an orderly manner, which effectively improves the cleaning effect of the filter bag 101, while avoiding irreversible damage to the micropore structure of the filter bag 101, thereby ensuring the filtration accuracy of the filter bag 101 and extending the service life of the filter bag 101.

[0023] Among them, the chemical precipitates attached to the filter bag 101 of the bag filter 100 used in the field of in-situ leaching uranium mining are divided into two categories. The first type of precipitate is hydroxide precipitate, and the second type of precipitate is silica precipitate. The two can be directionally dissolved by the first cleaning agent stored in the first cleaning agent tank 1 and the second cleaning agent stored in the second cleaning agent tank 2, respectively.

[0024] Specifically, the first cleaning agent can be a sulfuric acid solution or a hydrochloric acid solution with a concentration of 5 g / L to 30 g / L; the second cleaning agent can be a sodium hydroxide solution or a sodium carbonate solution with a concentration of 20 g / L to 80 g / L.

[0025] Among them, the inlet valve 9 on the inlet pipe 4 and the outlet valve 10 on the outlet pipe 5, as components for controlling the passage of the bag filter 100, have dual functions: on the one hand, under the normal filtration condition of the bag filter 100, the inlet valve 9 and the outlet valve 10 are opened to ensure the stable flow of the leachate; on the other hand, when chemical precipitates adhere to the surface of the filter bag 101, resulting in poor solution flux and meeting the preset cleaning trigger conditions, the inlet valve 9 and the outlet valve 10 are closed to form a relatively closed chamber inside the bag filter 100. At this time, the first cleaning agent tank 1, the second cleaning agent tank 2 or the water tank 3 can be connected to the bag filter 100, allowing the cleaning agent or water to fully soak the filter bag 101, improving the cleaning effect, and at the same time preventing the cleaning agent or water from mixing into the normal filtration feed liquid system and interfering with the normal production process of in-situ leaching uranium mining.

[0026] Specifically, the preset cleaning trigger conditions are determined by the monitoring instruments supporting the bag filter 100, specifically, either one or both of the following two situations are satisfied: one is that it is monitored by the outlet flowmeter 21 on the outlet pipe 5 that the real-time outlet flow rate of the bag filter 100 drops below 90% of the initial outlet flow rate when the filter bag 101 has no adhered chemical precipitates; the other is calculated based on the difference between the readings of the inlet pressure gauge 11 on the inlet pipe 4 and the outlet pressure gauge 12 on the outlet pipe 5, and the inlet and outlet pressure difference of the bag filter 100 is greater than 0.05 MPa. That is to say, when the outlet flow rate of the bag filter 100 drops below 90% of the initial outlet flow rate, and / or the inlet and outlet pressure difference is greater than 0.05 MPa, it is determined that the accumulation of chemical precipitates on the surface of the filter bag 101 has affected the normal filtration efficiency, and the cleaning operation of the filter bag 101 needs to be started.

[0027] Among them, during the cleaning operation of the filter bag 101, first close the inlet valve 9 and the outlet valve 10, and then selectively connect the first cleaning agent tank 1, the second cleaning agent tank 2 and the water tank 3 to the bag filter 100 to perform the cleaning operation as needed.

[0028] Specifically, an exemplary cleaning process is as follows: first connect the first cleaning agent tank 1 to dissolve the hydroxide precipitate, then connect the water tank 3 for rinsing, then connect the second cleaning agent tank 2 to dissolve the silicate precipitate, and finally connect the water tank 3 again to complete the thorough rinsing.

[0029] It should be noted that after closing the inlet valve 9 and the outlet valve 10, after the cleaning agent soaking is completed, and after the water rinsing is completed, the corresponding accumulated liquid in the bag filter 100 needs to be emptied.

[0030] In some possible implementation embodiments disclosed in the present application, refer to Figure 1As shown, the filter bag 101 cleaning device also includes a waste liquid pipe 8, a waste liquid valve 19, and a waste liquid pool 24; one end of the waste liquid pipe 8 is connected to the bag filter 100, and the other end is connected to the waste liquid pool 24, and the waste liquid valve 19 is installed on the waste liquid pipe 8.

[0031] In this embodiment, after the filter bag 101 cleaning device is equipped with a waste liquid pipe 8, a waste liquid valve 19, and a waste liquid tank 24, the waste liquid pipe 8 can achieve stable connection between the bag filter 100 and the waste liquid tank 24. The waste liquid valve 19 can precisely control the on / off state of the waste liquid pipe 8. At each evacuation stage of the cleaning process, i.e., after closing the inlet valve 9 and the outlet valve 10, the residual medium in the bag filter 100 is emptied; after the first cleaning agent soaking is completed, the first cleaning agent waste liquid is emptied; after the second cleaning agent soaking is completed, the second cleaning agent waste liquid is emptied; and after rinsing with clean water, the waste liquid is emptied. During the empty washing process, various waste liquids can be discharged smoothly into the waste liquid pool 24 through the waste liquid pipe 8 by opening the waste liquid valve 19. This achieves directional discharge and centralized collection of various waste liquids, which can prevent the accumulation of various waste liquids in the bag filter 100 and prevent residual waste liquid from contaminating the cleaning agent or clean water used in subsequent cleaning operations, thus ensuring the effectiveness of each stage of cleaning operations. At the same time, it can thoroughly remove residual cleaning agent in the bag filter 100, preventing residual cleaning agent from mixing into the leaching solution after the filtration conditions are restored, and effectively avoiding interference with the normal production indicators of uranium leaching.

[0032] It should be noted that after closing the inlet valve 9 and the outlet valve 10, the medium remaining in the bag filter 100 is the leaching liquid under normal filtration conditions for in-situ leaching of uranium. The evacuation operation can prevent the leaching liquid from mixing with the first or second cleaning agent subsequently introduced, and prevent the cleaning agent from being diluted and reducing its directional dissolution capacity for hydroxide and silica precipitates. The cleaning agent waste liquid after the cleaning agent soaking is the ineffective cleaning agent that has dissolved the target precipitate. The evacuation operation can completely discharge the first cleaning agent waste liquid containing hydroxide precipitate and the second cleaning agent waste liquid containing silica precipitate, and prevent the ineffective cleaning agent from remaining in the bag filter 100, affecting the clean water rinsing effect. The wash water after the clean water rinsing is the rinsing waste water carrying the cleaning agent residue on the surface of the filter bag 101. The evacuation operation can completely discharge the wash water, ensuring that there is no cleaning agent residue on the surface of the filter bag 101, and preventing the residual cleaning agent from mixing into the leaching liquid after the filtration conditions are restored, thus interfering with the production indicators of in-situ leaching of uranium.

[0033] One end of the waste liquid pipe 8 is connected to the outlet pipe 5 of the bag filter 100, and the connection between the waste liquid pipe 8 and the outlet pipe 5 is located upstream of the outlet valve 10, corresponding to the section of the outlet pipe 5 after the medium flows out of the bag filter 100 and before the outlet valve 10.

[0034] Among them, the waste liquid valve 19 can be an acid and alkali resistant ball valve. In each dredging stage of the cleaning process, the operator can manually open and close the waste liquid valve 19 to achieve the controlled discharge of residual media, cleaning agent waste liquid and washing water in the bag filter 100, ensuring that all waste liquid is discharged into the waste liquid pool 24 through the waste liquid pipe 8.

[0035] Among them, the effective volume of the waste liquid pool 24 is not less than 5 times the volume of the bag filter 100, and can accommodate the total amount of residual media, cleaning agent waste liquid and washing water generated in a single cleaning, so as to meet the continuous temporary storage needs of multiple batches of cleaning operations.

[0036] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the filter bag 101 cleaning device also includes an air compressor 23, which is connected to the bag filter 100, and an air inlet valve 17 is provided on the connecting pipeline between the air compressor 23 and the bag filter 100.

[0037] In this embodiment, by setting up an air compressor 23, the liquid accumulated in the bag filter 100 can be discharged more quickly during the evacuation stage of each stage, thereby reducing the accumulation of residual media, cleaning agent waste liquid and washing water.

[0038] Among them, the air compressor 23 is an air compressor used to generate and output compressed gas with stable pressure, providing power support for the rapid drainage of liquid accumulated in the bag filter 100. Through the pressure difference formed inside the bag filter 100 by the compressed gas, various accumulated liquids are driven to flow to the waste liquid pipe 8.

[0039] The connecting pipeline serves as the gas transport carrier between the air compressor 23 and the bag filter 100. One end of the pipeline is sealed to the gas outlet of the air compressor 23, and the other end is sealed to the cavity of the bag filter 100, which can ensure that the compressed gas is stably and leak-free transported from the air compressor 23 to the inside of the bag filter 100.

[0040] The intake valve 17 can be an acid and alkali resistant ball valve, which is installed on any effective section of the connecting pipeline. When the filter bag 101 cleaning device is not in the venting state, the intake valve 17 is in the closed state, which can cut off the connection path between the air compressor 23 and the bag filter 100, preventing residual media, cleaning agent waste liquid, washing water and other liquids in the bag filter 100 from flowing back into the air compressor 23, causing corrosion or malfunction of the air compressor 23 components. When the filter bag 101 cleaning device enters the venting state of each stage, the intake valve 17 is in the open state, opening the delivery channel for the compressed gas output by the air compressor 23, so that the compressed gas can smoothly enter the bag filter 100 to perform the liquid venting operation.

[0041] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1As shown, the filter bag 101 cleaning device also includes an automatic exhaust valve 18, which is connected to the bag filter 100.

[0042] In this embodiment, by setting an automatic exhaust valve 18, the gas inside the bag filter 100 can be automatically discharged during the process of introducing the first or second cleaning agent into the bag filter 100. This ensures that the first or second cleaning agent can completely fill the internal chamber of the bag filter 100, guaranteeing that the cleaning agent achieves full and sufficient contact with the hydroxide or silica precipitates attached to the surface and pores of the filter bag 101. This significantly improves the directional dissolution efficiency of the cleaning agent on the target precipitates, avoids unsoaked areas of the filter bag 101 caused by local gas blockage due to gas residue, and ensures the uniformity and thoroughness of the cleaning operation at each stage. At the same time, the automatic exhaust valve 18 does not require manual opening and closing intervention and can synchronously complete the exhaust operation in conjunction with the cleaning agent introduction process, improving the automation and ease of operation of the cleaning operation. It can also avoid local pressure fluctuations caused by the gas volume pressure inside the bag filter 100, protect the structural stability of the bag filter 100 and each connecting pipeline, and thus ensure the reliable operation of the filter bag 101 cleaning device.

[0043] When the filter bag 101 cleaning device includes an air compressor 23, the automatic exhaust valve 18 is connected to the connecting pipeline between the air compressor 23 and the bag filter 100, and its installation position is in the pipeline section between the air inlet valve 17 and the cavity of the bag filter 100.

[0044] Specifically, the automatic air vent valve 18 has a built-in float mechanism. When the first or second cleaning agent is introduced into the bag filter 100, because the density of the gas inside the bag filter 100 is much lower than that of the cleaning agent, the gas will naturally accumulate at the top of the bag filter 100, i.e., the installation position of the automatic air vent valve 18. At this time, the gas occupies the internal space of the automatic air vent valve 18, and the float of the automatic air vent valve 18 sinks due to the loss of liquid buoyancy. The vent is open, continuously discharging the gas inside the bag filter 100, making room for the cleaning agent to fill the filter chamber, and ensuring that the cleaning agent can completely cover the filter bag 101. As the cleaning agent continues to be injected, the liquid gradually fills the inside of the bag filter 100 until it submerges the float of the automatic air vent valve 18. The buoyancy of the liquid will push the float upward, making it tightly fit the vent, thus achieving the automatic closure of the automatic air vent valve 18.

[0045] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the filter bag 101 cleaning device also includes cleaning branch pipes 6 and cleaning main pipes 7; there are multiple cleaning branch pipes 6, one end of each cleaning branch pipe 6 is connected to the first cleaning agent tank 1, the second cleaning agent tank 2 and the clean water tank 3 respectively, and the other end of each cleaning branch pipe 6 is connected to one end of the cleaning main pipe 7, and the other end of the cleaning main pipe 7 is connected to the bag filter 100.

[0046] In this embodiment, by setting up cleaning branch pipes 6 and a cleaning main pipe 7, multiple cleaning branch pipes 6 are respectively connected to the first cleaning agent tank 1, the second cleaning agent tank 2, and the clean water tank 3. The other ends of the multiple cleaning branch pipes 6 are then converged to the cleaning main pipe 7 and connected to the bag filter 100, realizing the centralized integration and orderly connection of the pathways between each cleaning agent tank and the bag filter 100. This ensures that the first cleaning agent, the second cleaning agent, and the clean water are independently transported through their respective cleaning branch pipes 6, avoiding premature mixing of different media during transportation and affecting the cleaning effect. At the same time, the cleaning main pipe 7 enables the unified transportation of various media to the bag filter 100, simplifying the connection structure between each cleaning agent tank and the bag filter 100, reducing the clutter of the pipeline layout, facilitating individual control and maintenance of each media transportation pathway, and ensuring the stability and smoothness of the transportation of various media to the bag filter 100 as needed. This provides reliable pipeline support for subsequent targeted cleaning and clean water rinsing operations.

[0047] Among them, there are three cleaning branch pipes 6, which are connected to the first cleaning agent tank 1, the second cleaning agent tank 2, and the clean water tank 3 in a one-to-one correspondence. Each cleaning branch pipe 6 is responsible for the independent delivery of a cleaning medium.

[0048] Among them, the end of the main cleaning pipe 7 away from the cleaning branch pipe 6 is connected to the inlet pipe 4, and the connection point between the main cleaning pipe 7 and the inlet pipe 4 is located downstream of the inlet valve 9 on the inlet pipe 4.

[0049] In the above embodiments, see Figure 1 As shown, a first cleaning agent valve 13 is provided on the cleaning branch pipe 6 connected to the first cleaning agent tank 1, a second cleaning agent valve 14 is provided on the cleaning branch pipe 6 connected to the second cleaning agent tank 2, a clean water valve 15 is provided on the cleaning branch pipe 6 connected to the clean water tank 3, and a cleaning main valve 16 is provided on the cleaning main pipe 7.

[0050] It should be noted that a first cleaning agent valve 13 is installed on the cleaning branch pipe 6 connected to the first cleaning agent tank 1, a second cleaning agent valve 14 is installed on the cleaning branch pipe 6 connected to the second cleaning agent tank 2, and a clean water valve 15 is installed on the cleaning branch pipe 6 connected to the clean water tank 3. A cleaning main valve 16 is installed on the cleaning main pipe 7. This allows for independent control of the valves on each cleaning branch pipe 6, enabling separate delivery and on / off control of the first cleaning agent, the second cleaning agent, and clean water. This effectively prevents different cleaning media from mixing prematurely during delivery, thus avoiding impact on the cleaning effect. At the same time, the cleaning main valve 16 allows for overall control of the delivery status of the cleaning media to the bag filter 100. Combined with components such as the inlet valve 9, it allows for flexible switching between filtration and cleaning modes. This facilitates precise control of the media supply at each stage of the cleaning operation by the operator and also allows for the disconnection of the passage between each cleaning agent tank, clean water tank 3, and bag filter 100 during non-cleaning conditions, preventing media backflow or leakage. This optimizes the control reliability and operational convenience of the pipeline system.

[0051] In the above embodiments, see Figure 1 As shown, a cleaning pump 20 is also provided on the main cleaning pipe 7. The cleaning pump 20 can be an acid and alkali resistant pipeline pump.

[0052] It should be noted that the cleaning pump 20 installed on the main cleaning pipe 7 provides stable power support for the delivery of the first cleaning agent, the second cleaning agent, and clean water. This effectively increases the flow pressure and velocity of various cleaning media in the cleaning branch pipes 6 and the main cleaning pipe 7, ensuring that the cleaning agent and clean water are quickly and adequately delivered to the bag filter 100, fully wetting the surface and pores of the filter bag 101, and enhancing the dissolution and rinsing effect on hydroxide and silica precipitates. Simultaneously, the cleaning pump 20 can adapt to the delivery requirements of different media. Combined with the regulation of the first cleaning agent valve 13, the second cleaning agent valve 14, the clean water valve 15, and the main cleaning valve 16, it ensures stable flow and continuous supply of various media during delivery, avoiding problems such as poor media delivery or insufficient soaking of the filter bag 101 due to insufficient power, and ensuring that the cleaning operation at each stage proceeds efficiently according to the process.

[0053] In the above embodiments, see Figure 1 As shown, a cleaning medium flow meter 22 is also installed on the cleaning main pipe 7.

[0054] It should be noted that a cleaning medium flow meter 22 is installed on the main cleaning pipe 7, which can accurately monitor the flow data of the first cleaning agent, the second cleaning agent, and clean water flowing through the main cleaning pipe 7 in real time, providing an intuitive basis for operators to adjust the delivery status of various cleaning media. Operators can combine the cleaning process requirements with the readings of the cleaning medium flow meter 22, and coordinate with the cleaning pump 20, the first cleaning agent valve 13, the second cleaning agent valve 14, the clean water valve 15, and the main cleaning valve 16 to accurately control the delivery volume and rate of each medium, ensuring that the cleaning operation at each stage proceeds in an orderly manner according to the preset flow requirements, further improving the accuracy, stability, and controllability of the filter bag 101 cleaning.

[0055] Further, see Figure 2 As shown, to illustrate the implementation process of the above-described filter bag 101 cleaning device, an embodiment of this application also provides a filter bag 101 cleaning method, including: Step S1: Real-time acquisition of the outlet flow rate and inlet / outlet hydraulic pressure difference of the bag filter 100.

[0056] Among them, relying on the liquid flow meter 21 on the liquid outlet pipe 5 of the bag filter 100, the real-time liquid flow data of the filter bag 101 is collected in real time; relying on the liquid inlet pressure gauge 11 on the liquid inlet pipe 4 and the liquid outlet pressure gauge 12 on the liquid outlet pipe 5, the pressure values ​​at both ends are collected in real time and the difference is calculated, that is, the inlet and outlet hydraulic pressure difference.

[0057] It should be noted that when chemical precipitates adhere to the surface of filter bag 101, they will clog the micropores of filter bag 101, directly resulting in a decrease in the outflow rate and an increase in the inlet and outlet pressure difference. This step S1 is used to determine the degree of contamination of filter bag 101, providing a triggering basis for cleaning operations.

[0058] Step S2: When the outlet flow rate of the bag filter 100 drops to below 90% of the initial flow rate, and / or the inlet and outlet pressure difference is greater than 0.05MPa, close the inlet valve 9 and outlet valve 10 of the bag filter 100 to drain the residual medium inside the bag filter 100.

[0059] The cleaning operation is initiated when any one or all of the following conditions are met: the outlet flow rate of the bag filter 100 drops to below 90% of the initial flow rate; or the inlet and outlet hydraulic pressure difference is greater than 0.05 MPa.

[0060] When the inlet valve 9 and outlet valve 10 are closed, the connection between the bag filter 100 and the main process feed liquid system of in-situ leaching uranium mining can be cut off, so that a relatively closed chamber is formed inside the bag filter 100.

[0061] When emptying the residual medium in the bag filter 100, the waste liquid valve 19 on the waste liquid pipe 8 is opened. If the device is equipped with an air compressor 23, the air inlet valve 17 is opened simultaneously, and the compressed gas is used to push the residual leachate in the filter through the waste liquid pipe 8 into the waste liquid pool 24.

[0062] It should be noted that residual leachate will dilute the subsequently introduced cleaning agent, reducing its ability to dissolve the precipitate. Step S2 is used to construct the closed chamber required for the cleaning operation, eliminating the interference of residual leachate on the dilution of the cleaning agent.

[0063] Step S3: Connect the first cleaning agent tank 1 to the bag filter 100, and introduce the first cleaning agent into the bag filter 100. After the first cleaning agent fills the bag filter 100 and the filter bag 101 is completely submerged, stop introducing the first cleaning agent and keep the filter bag 101 completely submerged for a first preset time. After the submersion is completed, drain the waste liquid of the first cleaning agent in the bag filter 100.

[0064] When the first cleaning agent tank 1 is connected to the bag filter 100, the first cleaning agent valve 13 and the main cleaning valve 16 corresponding to the first cleaning agent tank 1 are opened, the second cleaning agent valve 14, the clean water valve 15 and other irrelevant valves are closed, the cleaning pump 20 is started, and the first cleaning agent in the first cleaning agent tank 1 is transported to the bag filter 100 through the cleaning branch pipe 6 and the cleaning main pipe 7.

[0065] The determination of whether the first cleaning agent fills the bag filter 100 is based on the exhaust status of the automatic exhaust valve 18. When the float of the automatic exhaust valve 18 rises and closes the exhaust port, it indicates that the first cleaning agent has filled the chamber of the bag filter 100 and the filter bag 101 is completely submerged. At this time, the delivery of the first cleaning agent is stopped, that is, the first cleaning agent valve 13, the main cleaning valve 16 and the cleaning pump 20 corresponding to the first cleaning agent tank 1 are closed.

[0066] During the soaking of filter bag 101, it is kept in a closed state and the filter bag 101 is soaked in the first cleaning agent for 4h~24h to ensure that the first cleaning agent fully penetrates the pores of filter bag 101 and reacts with the hydroxide precipitate to achieve dissolution.

[0067] After soaking, the waste liquid valve 19 and the air inlet valve 17 are opened to discharge the first cleaning agent waste liquid containing dissolved hydroxide precipitate into the waste liquid pool 24.

[0068] It should be noted that the first cleaning agent is an acidic solution, which can neutralize the hydroxide precipitate and achieve directional dissolution. This step S3 is used to directionally dissolve the hydroxide precipitate on the surface of the filter bag 101 using the first cleaning agent.

[0069] Step S4: Connect the clean water tank 3 to the bag filter 100, and flush the bag filter 100 with clean water until the pH value of the wash water in the bag filter 100 rises to the first preset range. Then stop flushing the clean water and drain the wash water from the bag filter 100.

[0070] When the clean water tank 3 is connected to the bag filter 100, the first cleaning agent valve 13 is closed, the clean water valve 15 and the main cleaning valve 16 are opened, and the cleaning pump 20 is started to deliver the clean water in the clean water tank 3 to the bag filter 100 for rinsing.

[0071] The method for determining the end of rinsing is as follows: A sample of the wash water inside the bag filter 100 is taken through the waste liquid pipe 8, and the pH value of the sampled wash water is measured. When the pH value of the sampled wash water reaches a first preset range, the clean water valve 15, the main cleaning valve 16, and the cleaning pump 20 are closed, stopping the flow of clean water into the bag filter 100. It should be noted that the first preset range is adapted to the process type of in-situ leaching uranium mining. The first preset range for acid in-situ leaching uranium mining is pH ≥ 2, and the first preset range for neutral in-situ leaching uranium mining is pH ≥ 6.

[0072] During the process of draining the wash water, the waste liquid valve 19 and the air inlet valve 17 are opened to discharge the wash water into the waste liquid pool 24.

[0073] It should be noted that rinsing with clean water can remove residual acidic solution, preventing it from corroding the filter bag 101 or affecting the properties of the leachate in subsequent filtration. This step S4 is used to rinse the surface of the filter bag 101 and the filter chamber to remove residual first cleaning agent and dissolved precipitates, so that the pH value of the filter bag 101 surface is suitable for the normal filtration conditions of the leachate.

[0074] Step S5: Reopen the inlet valve 9 and outlet valve 10 of the bag filter 100, and obtain the outlet flow rate and inlet / outlet pressure difference of the bag filter 100 again.

[0075] The process involves opening the inlet valve 9 and outlet valve 10 to reconnect the bag filter 100 to the main in-situ leaching uranium mining system, restoring normal filtration conditions. Using the outlet flow meter 21, inlet pressure gauge 11, and outlet pressure gauge 12, the outlet flow rate and inlet / outlet pressure difference data are collected again. If the parameters return to normal after cleaning, it indicates that the main contaminant on the filter bag 101 is hydroxide precipitate, and the cleaning operation can be terminated. If the parameters do not meet the standards, it indicates that silica precipitate is still attached to the surface of the filter bag 101, requiring further targeted cleaning.

[0076] It should be noted that step S5 is used to verify the filtration efficiency of filter bag 101 after cleaning with hydroxide precipitate and to determine whether further cleaning of silica precipitate is required.

[0077] Step S6: When the re-obtained outflow rate is still less than 90% of the initial flow rate, and / or the inlet and outlet pressure difference is still greater than 0.05 MPa, close the inlet valve 9 and outlet valve 10 of the bag filter 100 to drain the residual medium in the bag filter 100; then control the second cleaning agent tank 2 to connect with the bag filter 100, and introduce the second cleaning agent into the bag filter 100. After the second cleaning agent fills the bag filter 100 and the filter bag 101 is completely submerged, stop introducing the second cleaning agent and keep the filter bag 101 completely submerged for a second preset time. After the submersion is completed, drain the waste liquid of the second cleaning agent in the bag filter 100.

[0078] If the parameters do not meet the standards, close the inlet valve 9 and the outlet valve 10, open the waste liquid valve 19 and the air inlet valve 17, and drain the residual leachate in the filter.

[0079] When the second cleaning agent tank 2 is connected to the bag filter 100, the second cleaning agent valve 14 and the main cleaning valve 16 are opened, the cleaning pump 20 is started, and the second cleaning agent is delivered to the bag filter 100. The delivery is stopped after the automatic exhaust valve 18 determines that the liquid is full.

[0080] During the soaking of filter bag 101, filter bag 101 is kept soaked in the second cleaning agent for 4h~24h to allow the alkaline solution to fully react with the silica precipitate and dissolve it.

[0081] After soaking, the waste liquid valve 19 and the air inlet valve 17 are opened to discharge the ineffective second cleaning agent waste liquid into the waste liquid pool 24.

[0082] It should be noted that alkaline solutions can react with silica precipitates to form soluble silicates. Step S5 is used to dissolve the silica precipitate directionally with a second cleaning agent when the filtration efficiency of filter bag 101 has not recovered after hydroxide precipitation cleaning.

[0083] Step S7: Connect the clean water tank 3 to the bag filter 100 again, and flush the bag filter 100 with clean water until the pH value of the wash water in the bag filter 100 drops to the second preset range. Stop flushing with clean water and drain the wash water from the bag filter 100.

[0084] When the clean water tank 3 is connected to the bag filter 100 again, the second cleaning agent valve 14 is closed, the clean water valve 15 and the main cleaning valve 16 are opened, and the cleaning pump 20 is started to deliver clean water for rinsing.

[0085] The method for determining the end of rinsing is as follows: A sample of the wash water inside the bag filter 100 is taken through the wastewater pipe 8, and the pH value of the sampled wash water is measured. When the pH value of the sampled wash water reaches a second preset range, the clean water valve 15, the main cleaning valve 16, and the cleaning pump 20 are closed, stopping the flow of clean water into the bag filter 100. Here, the second preset range is 7 ≤ pH ≤ 8.

[0086] During the process of draining the wash water, the waste liquid valve 19 and the air inlet valve 17 are opened to discharge the wash water into the waste liquid pool 24.

[0087] It should be noted that the second preset range is a neutral range, which can avoid the corrosion of filter bag 101 by residual alkaline washing solution, and at the same time prevent it from changing the pH of the leachate, thus ensuring the stability of the in-situ leaching uranium mining process parameters. This step S7 is used to thoroughly remove residual second cleaning agent and dissolved silicates, so that the surface of filter bag 101 returns to neutral and meets the requirements of normal filtration conditions.

[0088] Step S8: Reopen the inlet valve 9 and outlet valve 10 of the bag filter 100.

[0089] Specifically, opening the inlet valve 9 and the outlet valve 10 allows the bag filter 100 to be reconnected to the main uranium leaching process system, and the filter bag 101 resumes its function of filtering the leachate.

[0090] It should be noted that after two directional cleanings and two rinses with clean water, the hydroxide and silica precipitates on the surface of filter bag 101 have been completely removed, and the micropores of filter bag 101 have been restored to unobstructed flow, ensuring filtration efficiency and service life. This step S8 is used to restore filter bag 101 to normal filtration conditions.

[0091] By applying the technical solution of this embodiment, two types of chemical precipitates are addressed on the surface of the filter bag 101 of the in-situ leaching uranium bag filter 100. The first cleaning agent tank 1 and the second cleaning agent tank 2 store the first and second cleaning agents respectively. A delivery and control structure is constructed using cleaning branch pipes 6, cleaning main pipe 7, first cleaning agent valve 13, second cleaning agent valve 14, clean water valve 15, cleaning main valve 16, and cleaning pump 20. This achieves the directional dissolution of hydroxide and silica precipitates. Combined with the staged clean water rinsing process of the clean water tank 3, [further details are needed]. Effectively improves the targeting and thoroughness of filter bag 101 cleaning; through the switching control of inlet valve 9 and outlet valve 10, the cleaning operation is completed in the closed chamber formed by the bag filter 100, avoiding mixing of cleaning agent and normal leaching solution, and ensuring the stability of the in-situ leaching uranium production process; the waste liquid collection structure consisting of waste liquid pipe 8, waste liquid valve 19, and waste liquid pool 24 realizes the centralized collection and directional discharge of various waste liquids, preventing residual waste liquid from interfering with subsequent cleaning steps, and avoiding pollution of the production environment by waste liquid; the air compressor 23 outputs pressure Compressed gas is introduced into the bag filter 100 through the inlet valve 17, accelerating the drainage of internal accumulated liquid, reducing the residual amount of cleaning agent and clean water, and improving cleaning efficiency; the automatic exhaust valve 18 automatically opens and closes with the built-in float mechanism, ensuring that the cleaning agent completely fills the cavity of the bag filter 100, eliminating cleaning blind spots caused by local air blockage, and ensuring the uniform soaking of the filter bag 101; the first cleaning agent valve 13, the second cleaning agent valve 14, the clean water valve 15, and the main cleaning valve 16 on the cleaning branch pipe 6 and the cleaning main pipe 7 work in conjunction with the cleaning medium flow meter 2 2. The inlet pressure gauge 11, outlet pressure gauge 12, and outlet flow meter 21 enable precise control of the cleaning medium delivery. The flow data from the cleaning medium flow meter 22 and the pH value monitoring results of the washing water provide quantitative basis for the cleaning process, improving the controllability and repeatability of the operation. The entire cleaning process does not require disassembling the filter bag 101, avoiding irreversible damage to the micropore structure of the filter bag 101 caused by disassembly and assembly operations, ensuring the filtration accuracy of the filter bag 101, extending the service life of the filter bag 101, and reducing the equipment operation and maintenance costs of the in-situ leaching uranium mining process.

[0092] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0093] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A filter bag cleaning device, characterized in that, The filter bag for cleaning a bag filter includes a first cleaning agent tank, a second cleaning agent tank, and a clean water tank. The first cleaning agent tank stores a first cleaning agent, which is used to dissolve a first type of precipitate adhering to the filter bag. The second cleaning agent tank stores a second cleaning agent, which is used to dissolve a second type of precipitate adhering to the filter bag. The first cleaning agent tank, the second cleaning agent tank, and the clean water tank can all be selectively connected to the bag filter. The inlet pipe of the bag filter is equipped with an inlet valve and an inlet pressure gauge, and the outlet pipe of the bag filter is equipped with an outlet valve, an outlet pressure gauge, and an outlet flow meter.

2. The filter bag cleaning device according to claim 1, characterized in that, The filter bag cleaning device also includes an air compressor, which is connected to the bag filter, and an air inlet valve is provided on the connecting pipeline between the air compressor and the bag filter.

3. The filter bag cleaning device according to claim 1, characterized in that, The filter bag cleaning device also includes an automatic exhaust valve, which is connected to the bag filter.

4. The filter bag cleaning device according to claim 1, characterized in that, The filter bag cleaning device also includes a waste liquid pipe, a waste liquid valve, and a waste liquid tank; one end of the waste liquid pipe is connected to the bag filter, and the other end is connected to the waste liquid tank, and the waste liquid valve is installed on the waste liquid pipe.

5. The filter bag cleaning device according to claim 1, characterized in that, The filter bag cleaning device further includes cleaning branch pipes and a cleaning main pipe; there are multiple cleaning branch pipes, one end of each cleaning branch pipe is connected to the first cleaning agent tank, the second cleaning agent tank and the clean water tank respectively, and the other end of each cleaning branch pipe is connected to one end of the cleaning main pipe, and the other end of the cleaning main pipe is connected to the bag filter.

6. The filter bag cleaning device according to claim 5, characterized in that, A first cleaning agent valve is provided on the cleaning branch pipe connected to the first cleaning agent tank, a second cleaning agent valve is provided on the cleaning branch pipe connected to the second cleaning agent tank, a clean water valve is provided on the cleaning branch pipe connected to the clean water tank, and a main cleaning valve is provided on the main cleaning pipe.

7. The filter bag cleaning device according to claim 6, characterized in that, A cleaning pump is also installed on the main cleaning pipe.

8. The filter bag cleaning device according to claim 6, characterized in that, The cleaning manifold is also equipped with a cleaning medium flow meter.

9. A method for cleaning filter bags, characterized in that, The filter bag cleaning device as described in any one of claims 1-8, wherein the filter bag cleaning method comprises: The outlet flow rate and inlet / outlet hydraulic pressure difference of the bag filter are acquired in real time. When the outlet flow rate of the bag filter drops to below 90% of the initial flow rate, and / or the inlet and outlet pressure difference is greater than 0.05 MPa, close the inlet valve and the outlet valve of the bag filter to drain the residual medium in the bag filter. The first cleaning agent tank is connected to the bag filter. The first cleaning agent is introduced into the bag filter. After the first cleaning agent fills the bag filter and the filter bag is completely submerged, the introduction of the first cleaning agent is stopped. The filter bag is kept completely submerged for a first preset time. After the submersion is completed, the waste liquid of the first cleaning agent in the bag filter is drained. Control the connection between the clean water tank and the bag filter, and introduce clean water into the bag filter for rinsing until the pH value of the wash water in the bag filter rises to the first preset range, then stop introducing clean water and drain the wash water from the bag filter. Reopen the inlet valve and outlet valve of the bag filter, and obtain the outlet flow rate and inlet / outlet pressure difference of the bag filter again; When the re-obtained outflow rate is still below 90% of the initial flow rate, and / or the inlet and outlet pressure difference is still greater than 0.05 MPa, close the inlet valve and outlet valve of the bag filter to drain the residual medium in the bag filter; then control the second cleaning agent tank to connect with the bag filter, and introduce the second cleaning agent into the bag filter. After the second cleaning agent fills the bag filter and the filter bag is completely submerged, stop introducing the second cleaning agent and keep the filter bag completely submerged for a second preset time. After the submersion is completed, drain the waste liquid of the second cleaning agent in the bag filter. Reconnect the clean water tank to the bag filter and flush the bag filter with clean water until the pH value of the wash water in the bag filter drops to the second preset range. Stop flushing with clean water and drain the wash water from the bag filter. Reopen the inlet valve and the outlet valve of the bag filter.

10. The filter bag cleaning method according to claim 9, characterized in that, The first cleaning agent is an acidic solution capable of dissolving hydroxide precipitates, and the second cleaning agent is an alkaline solution capable of dissolving silica precipitates.

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