Lithium carbonate filtering device

Abstract

The lithium carbonate filtering device comprises a filtering tank body, the filtering tank body is connected with a cleaning system, a monitoring system is further arranged in the filtering tank body, the cleaning system comprises a flushing opening, the flushing opening is formed in the filtering tank body and provided with a flushing valve, and the end, located on the outer side of the filtering tank body, of the flushing opening is connected with an acid liquor circulating pump assembly; the other end of the filter tank body is positioned in the filter tank body and is connected with a flushing pipeline; the flushing pipeline is an annular pipeline; and cleaning nozzles are circumferentially distributed on the flushing pipeline. The washing pipeline in the washing system is annular, the washing nozzles are distributed on the circumference of the washing pipeline, and the special structures of the washing nozzles can realize circumferential eccentric rotating spraying, so that acid liquor can be sprayed out of the nozzles in a circular track, and the liquid spraying direction is continuously changed in the rotating process; the surface of the filter element can be uniformly covered at multiple angles, impurities accumulated on the filter element are dissolved, the filtering performance of the filter element is recovered, and the subsequent filtering effect and the service life of equipment are prevented from being influenced by residual accumulation of substances such as lithium carbonate. Moreover, the acid liquor circulates in the acid liquor circulating mechanism and continuously washes the filter element, so that the impurities are thoroughly removed. The acid liquor filtering assembly can filter recycled acid liquor, impurities carried by the acid liquor in the cleaning process are removed, the cleanliness of the acid liquor is guaranteed, the acid liquor always keeps good cleaning capacity in the repeated circulating cleaning process, the consumption and replacement frequency of the acid liquor are reduced, and the cost is reduced.

Description

Technical Field

[0001] The invention mainly relates to the technical field of lithium carbonate production, and specifically relates to a lithium carbonate filtering device. Background Art

[0002] Lithium carbonate, an inorganic compound, is a colorless monoclinic crystal or white powder. It can be used to make ceramics, medicines, catalysts, etc. It is a commonly used raw material for lithium-ion batteries.

[0003] Lithium carbonate is generally purified using a filtering device during processing. The prior art discloses a lithium carbonate filtering device, including a filter body, a liquid inlet, a clear liquid inlet, a reflux port, a slag discharge port and a filter element. The lower portion of the filter body is a conical shell, the slag discharge port is arranged at the bottom of the conical shell, the liquid inlet is arranged on the side wall of the filter body above the conical shell; the clear liquid inlet is arranged on the top of the filter body; and the filter element is fixed to the upper part of the inner cavity of the filter body by a mounting frame.

[0004] After the filter device in the above disclosed technology has been used for a period of time, the impurities filtered out are easily accumulated inside the filter device. These impurities will block the pores of the filter element, increase the resistance of the solution through, thereby reducing the purification speed and affecting the efficiency of purifying the lithium carbonate solution. Moreover, due to the accumulation of impurities, the effective filtration area of ​​the filter element will be reduced, further reducing the filtration performance. The staff is required to manually clean it regularly, which is a cumbersome process. It not only consumes manpower and time, but may also cause certain damage to the device during the cleaning process, affecting its service life. Summary of the invention

[0005] The present invention mainly provides a lithium carbonate filtering device to solve the technical problems raised in the above background technology.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: A lithium carbonate filtering device comprises a filtering tank body, wherein the filtering tank body is connected to a cleaning system and a monitoring system is also arranged inside the filtering tank body; The cleaning system includes a flushing port, which is arranged on the filter tank body and is equipped with a flushing valve. One end of the flushing port is located outside the filter tank body and is connected to an acid circulation pump assembly, and the other end is located inside the filter tank body and is connected to a flushing pipe. The flushing pipe is an annular pipe and has flushing nozzles distributed circumferentially thereon.

[0007] Furthermore, the flushing nozzle includes an outer shell, in which a fixed cover, a water wheel, a nozzle and a spray hole are arranged in sequence from back to front, the fixed cover is detachably mounted on the rear of the outer shell, the water wheel is rotatably mounted in the outer shell, a water wheel ball head is provided at the front end of the water wheel, the axis line of the water wheel ball head is eccentric with the rotation axis line of the water wheel, a nozzle ball head is provided at the front end of the nozzle, a movable sealing assembly is formed between the nozzle ball head and the spray hole, and a nozzle hole passing through along the axis line is provided in the nozzle, the front end of the nozzle hole passes through the nozzle ball head and is connected to the spray hole to form water outlet, and in addition, the water wheel ball head is movably mounted in the rear end of the nozzle hole.

[0008] Furthermore, a rotating shaft extending forward along the axis line is provided at the front end of the fixed cover, and a water inlet hole penetrating the rotating shaft along the axis line is also provided in the fixed cover. A water wheel hole penetrating along the axis line is provided in the water wheel, and the water wheel is rotatably connected to the rotating shaft through the rear end of the water wheel hole. In addition, the front end of the water wheel hole passes through the water wheel ball head.

[0009] Furthermore, it is characterized in that a water cavity is provided on the front end surface of the fixed cover, and a plurality of inclined water inlet holes are provided on the fixed cover and are evenly distributed in a circle with the water inlet hole as the center. The inclined water inlet holes are inclined in the same clockwise direction and connected to the water cavity, and the plurality of blades of the water wheel are arranged in the water cavity.

[0010] Furthermore, the acid circulation pump is connected to an acid storage tank via an acid pipeline, the acid storage tank is connected to an acid filter assembly, the acid filter assembly is connected to a reflux port via an acid pipeline, the reflux port is located in the filter tank body and is equipped with a reflux valve.

[0011] Furthermore, the filter tank body is provided with a feed pipe and a discharge pipe, and a filter element is provided inside the filter tank body, and the filter element divides the filter tank body into an upper chamber and a lower chamber.

[0012] Furthermore, the feed pipe is arranged in the lower cavity of the filter tank body, and a liquid inlet valve is also arranged on the feed pipe. The discharge pipe is installed in the upper cavity of the filter tank body, and a clear liquid valve is arranged on the discharge pipe.

[0013] Furthermore, the filter element is a multi-layer composite structure, the outer layer is a coarse filter, the middle layer is a fine filter, and the inner layer is a support layer.

[0014] Furthermore, the monitoring system includes two pressure sensors, and the two pressure sensors are respectively arranged on the feed pipe and the discharge pipe.

[0015] Furthermore, the liquid inlet valve, liquid clearing valve, flushing valve and reflux valve are all solenoid valves, and are all electrically connected to the PLC controller.

[0016] Compared with the prior art, the present invention has the following beneficial effects: First, the flushing pipe in the cleaning system of the present invention is annular and has flushing nozzles distributed circumferentially thereon. The special structure of the flushing nozzle can realize eccentric rotation spraying, so that the acid can be sprayed from the nozzle in a circular trajectory, and the spray direction is constantly changed during the rotation process, which can evenly cover the surface of the filter element at multiple angles, dissolve the impurities accumulated on the filter element, restore the filtering performance of the filter element, and avoid the accumulation of residual substances such as lithium carbonate that affect the subsequent filtering effect and the service life of the equipment. In addition, the acid circulates in the acid circulation mechanism, continuously flushes the filter element, and ensures that the impurities are completely removed. The acid filter assembly can filter the recycled acid, remove impurities carried by the acid during the cleaning process, ensure the cleanliness of the acid, and enable the acid to always maintain good cleaning ability during multiple cycles of cleaning, thereby reducing the consumption and replacement frequency of the acid and reducing costs.

[0017] Secondly, the present invention is provided with a filter element with a multi-layer composite structure. The outer coarse filter can effectively intercept larger particles of impurities in the lithium carbonate solution, such as unreacted raw material particles, agglomerated large lithium carbonate particles, etc.; the middle layer fine filter can further finely filter the solution to remove tiny impurity particles, colloids and some by-product impurities produced in the chemical synthesis process; the inner support layer provides stable structural support for the entire filter element.

[0018] Third, the PLC controller in the monitoring system provided by the present invention can realize multiple functions based on pressure monitoring. When the feed pressure is too high or the discharge pressure is too low, it may mean that the filter element is clogged. The PLC controller can automatically start the cleaning program to clean the filter element in time to ensure the normal filtration process. At the same time, by long-term monitoring of the pressure change trend, the service life of the filter element can also be predicted, and maintenance and replacement plans can be arranged in advance to reduce production interruptions caused by filter element failures.

[0019] Fourthly, the present invention can monitor the concentration, pH, liquid level and other information of the acid in real time through the composite sensor set in the acid storage tank. If the quality of the acid does not meet the requirements, the control system can issue an alarm to remind the operator to deal with it. According to the data of the composite sensor, the operator can manage the acid more accurately, realize the effective control of the quality of the acid, and further improve the cleaning efficiency and stability of the entire filtering device.

[0020] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a front cross-sectional view of the overall structure of the present invention; Figure 3It is a side view of the overall structure of the present invention; Figure 4 It is a top view of the overall structure of the present invention; Figure 5 It is a schematic diagram of the flushing pipeline structure of the present invention; Figure 6 It is a schematic diagram of the overall structure of the flushing nozzle of the present invention; Figure 7 It is a schematic diagram of the impeller structure of the present invention; Figure 8 It is a side sectional view of the flushing nozzle of the present invention;.

[0022] Description of the drawings: 1. Filter tank; 101. Feed pipe; 102. Discharge pipe; 103. Filter element; 104. Liquid inlet valve; 105. Liquid cleaning valve; 106. Coarse filter; 107. Fine filter; 108. Support layer; 2. Cleaning system; 201. Flushing port; 202. Flushing valve; 203. Flushing pipeline; 3. Monitoring system; 301. Pressure sensor; 4. Acid circulation cleaning mechanism; 401. Acid circulation pump; 402. Acid pipeline; 403 , acid storage tank; 404, acid filter assembly; 405, reflux port; 406, reflux valve; 407, composite sensor; 5, flushing nozzle; 501, housing; 502, fixing cover; 503, water wheel; 504, nozzle; 505, spray hole; 506, water wheel ball head; 507, nozzle ball head; 508, nozzle hole; 509, rotating shaft; 510, water inlet hole; 511, water wheel hole; 512, water cavity; 513, water inlet inclined hole; 514, blade. DETAILED DESCRIPTION

[0023] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive. Example

[0024] Please refer to the attached Figure 1 , 2 As shown in , 3, a lithium carbonate filtering device comprises a filtering tank body 1, a filter element 103 is arranged in the filtering tank body 1, the filter element 103 divides the filtering tank body 1 into an upper cavity and a lower cavity, a feed pipe 101 is arranged in the lower cavity of the filtering tank body 1, a liquid inlet valve 104 is also arranged on the feed pipe 101, a discharge pipe 102 is installed in the upper cavity of the filtering tank body 1 and a clear liquid valve 105 is arranged on the discharge pipe 102, the filtering tank body 1 is connected to a cleaning system 2, and a monitoring system 3 is also arranged inside the filtering tank body 1.

[0025] It should be noted that the filter element 103 is a multi-layer composite structure, with the outer layer being a coarse filter 106, the middle layer being a fine filter 107, and the inner layer being a support layer 108. The outer coarse filter 106 can effectively intercept larger particles of impurities in the lithium carbonate solution, such as unreacted raw material particles, agglomerated large lithium carbonate particles, etc. This can not only protect the intermediate fine filter 107 from the impact and blockage of large particles, extend the service life of the fine filter 107, but also quickly remove a large number of obvious impurities at the beginning of filtration, thereby improving the filtration efficiency; the intermediate fine filter 107 further finely filters the solution, and can remove tiny impurity particles, colloids, and some by-product impurities produced during the chemical synthesis process, thereby ensuring the high purity of the lithium carbonate solution after filtration, and meeting the requirements of high-quality lithium carbonate production; the inner support layer 108 provides a stable structural support for the entire filter element 103, so that it can withstand the pressure of the liquid during the filtration process, and ensure that the filter element 103 will not be deformed or damaged due to pressure during long-term use, thereby ensuring the stability of the filtration effect.

[0026] Please pay special attention to the attached drawings, as shown in which the cleaning system 2 includes a flushing port 201, which is arranged on the filter tank body 1 and is equipped with a flushing valve 202. One end of the flushing port 201 located on the outside of the filter tank body 1 is connected to an acid circulation cleaning mechanism 4, and the other end is located in the filter tank body 1 and is connected to a flushing pipe 203. The flushing pipe 203 is an annular pipe and flushing nozzles 5 are distributed in a circle thereon. The flushing nozzle 5 includes a shell 501, in which a fixed cover 502, a water wheel 503, a nozzle 504 and a spray hole 505 are arranged in sequence from back to front. The fixed cover 502 is detachably installed at the rear of the shell 501, and the water wheel 503 is rotatably installed in the shell 501. A water wheel ball head 506 is arranged at the front end of the water wheel 503, and the axis line of the water wheel ball head 506 is eccentric with the rotation axis line of the water wheel 503. A nozzle ball head 507 is arranged at the front end of the nozzle 504, and a movable sealing assembly is formed between the nozzle ball head 507 and the spray hole 505, and a nozzle hole 508 is arranged in the nozzle 504 along the axis line, and the front end of the nozzle hole 508 passes through the nozzle ball head 507 and is connected to the spray hole 505 to form water outlet. In addition, the water wheel ball head 506 is movably assembled in the rear end of the nozzle hole 508.

[0027] It should be noted that the front end of the fixed cover 502 is provided with a rotating shaft 509 extending forward along the axis, and the fixed cover 502 is also provided with a water inlet hole 510 penetrating the rotating shaft 509 along the axis. The water wheel 503 is provided with a water wheel hole 511 penetrating along the axis, and the water wheel 503 is rotatably connected to the rotating shaft 509 through the rear end of the water wheel hole 511. In addition, the front end of the water wheel hole 511 penetrates the water wheel ball head 506. Acid enters the housing 501, and the acid is sprayed out through the water inlet hole 510, the water wheel hole 511, the nozzle hole 508 and the spray hole 505 that are connected in sequence to rinse the filter element 103.

[0028] It should be noted that a water cavity 512 is provided on the front end surface of the fixed cover 502, and a plurality of water inlet inclined holes 513 are provided on the fixed cover 502, which are uniformly distributed in a circle with the water inlet hole 510 as the center. The water inlet inclined holes 513 are inclined in the same clockwise direction and connected to the water cavity 512, and a plurality of blades 514 of the water wheel 503 are arranged in the water cavity 512. The acid enters the water cavity 512 through the plurality of water inlet inclined holes 513 on the housing 501, and impacts the plurality of blades 514 to drive the water wheel 503 to rotate, and drives the water wheel ball head 506 to form a circular eccentric rotation in the rear end of the nozzle hole 508, and then drives the nozzle ball head 507 to form a synchronous circular eccentric rotation relative to the spray hole 505, so that the acid is sprayed from the spray hole 505 in a circular eccentric rotation and sprays, and evenly covers the surface of the filter element 103 at multiple angles.

[0029] Please pay special attention to the attached drawings, as shown, the acid circulation cleaning mechanism 4 includes an acid circulation pump 401, the acid circulation pump 401 is connected to an acid storage tank 403 through an acid pipeline 402, the acid storage tank 403 is connected to an acid filter assembly 404, the acid filter assembly 404 is connected to a reflux port 405 through an acid pipeline 402, the reflux port 405 is located in the filter tank body 1 and is equipped with a reflux valve 406, and in addition, a composite sensor 407 is provided on the acid storage tank 403.

[0030] It should be noted that the acid liquid circulation cleaning mechanism 4 further enhances the cleaning effect. The acid liquid enters the filter tank body 1 through the flushing port 201 from the acid liquid storage tank 403 via the acid liquid circulation pump 401. Under the action of the flushing pipe 203 and the flushing nozzle 5, the acid liquid can be sprayed more evenly on the surface of the filter element 103 to fully clean the filter element 103. Moreover, the acid liquid circulates between the filter tank body 1 and the acid liquid storage tank 403, continuously flushing the filter element 103 to ensure that impurities are thoroughly removed. The acid liquid filtering component 404 can filter the recycled acid liquid, remove impurities carried by the acid liquid during the cleaning process, ensure the cleanliness of the acid liquid, and enable the acid liquid to always maintain good cleaning ability during multiple circulation cleaning processes, thereby reducing the consumption and replacement frequency of the acid liquid and reducing the cost.

[0031] It should be noted that the composite sensor 407 in the acid storage tank 403 can detect multiple parameters of the acid in real time. The concentration, pH, liquid level and other information of the acid can be monitored. By monitoring the concentration of the acid, it can be ensured that the acid is cleaned within the appropriate concentration range to ensure the cleaning effect; pH monitoring helps prevent the pH value of the acid from deviating from the appropriate range. If the pH value increases, a small amount of concentrated hydrochloric acid can be added to lower the pH value; if the pH value is too low, an appropriate amount of water can be added for dilution, but the concentration change must be considered at the same time. Liquid level monitoring can promptly prompt the operator to add or replace the acid to avoid affecting the cleaning process and equipment safety due to insufficient or overflowing acid. According to the data of the composite sensor 407, the operator can manage the acid more accurately, achieve effective control of the acid quality, and further improve the cleaning efficiency and stability of the entire filter device.

[0032] The monitoring system 3 includes two pressure sensors 301, which are respectively arranged on the feed pipe 101 and the discharge pipe 102. The two pressure sensors 301 are electrically connected to the PLC controller, and the liquid inlet valve 104, the liquid clearing valve 105, the flushing valve 202 and the reflux valve 406 are all solenoid valves and are electrically connected to the PLC controller.

[0033] It should be noted that the two pressure sensors 301 in the monitoring system 3 can monitor the pressure changes of the inlet and outlet materials during the filtration process in real time. The pressure data is transmitted to the PLC controller through an electrical connection, and the PLC controller analyzes the pressure data according to the preset program and algorithm. Based on pressure monitoring, when the feed pressure is too high or the outlet pressure is too low, it may mean that the filter element 103 is blocked. The PLC controller starts the cleaning program by controlling the switches of each solenoid valve to clean the filter element 103 in time to ensure the normal progress of the filtration process. At the same time, by long-term monitoring of the pressure change trend, the service life of the filter element 103 can also be predicted, and maintenance and replacement plans can be arranged in advance to reduce production interruptions caused by failure of the filter element 103.

[0034] The specific operation process of the present invention is as follows: In the initial state, the inlet valve 104 and the clear liquid valve 105 are opened, the flushing valve 202 and the reflux valve 406 are closed, and the lithium carbonate solution delivery system is started, so that the lithium carbonate solution enters the lower cavity of the filter tank body 1 through the feed pipe 101. The solution enters the upper cavity of the filter tank body 1 through the filter element 103 to become a clear liquid and flows out of the filter tank body 1 from the discharge pipe 102. In this process, large particle impurities are intercepted by the outer coarse filter screen 106 of the filter element 103, and smaller particle impurities are intercepted by the intermediate fine filter screen 107.

[0035] The pressure sensors 301 on the feed pipe 101 and the discharge pipe 102 monitor the pressure in real time and transmit the data to the PLC controller. The PLC controller continuously monitors the pressure data, and if the pressure is within the normal range, the filtration process continues. When the PLC controller determines that the filtration resistance increases (such as the feed pressure increases, the discharge pressure decreases, etc.) according to the data of the pressure sensor 301, or reaches the preset cleaning trigger conditions such as the filtration time and the filtration volume, the liquid inlet valve 104 on the feed pipe 101 and the clear liquid valve 105 on the discharge pipe 102 are closed, the feeding of the lithium carbonate solution is stopped, the cleaning program is started, the flushing valve 202 and the reflux valve 406 are opened, and the acid circulation pump 401 is started. The acid enters the acid circulation pump 401 from the acid storage tank 403 through the acid pipeline 402, and then enters the flushing pipeline 203 through the flushing port 201. The nozzle ball head 507 in the flushing nozzle 5 distributed in a circle on the flushing pipeline 203 forms a synchronous circumferential eccentric rotation relative to the spray hole 505, so that the acid sprays from the spray hole 505 in a circumferential eccentric rotation and sprays, and evenly covers the surface of the filter element 103 at multiple angles. The acid is fully in contact with the impurities in the filter element 103, dissolves and carries the impurities to flow downward. The acid containing impurities flows out of the filter tank 1 through the reflux port 405 and enters the acid filter assembly 404. The acid filter assembly 404 filters the acid, and the acid after removing impurities returns to the acid storage tank 403 to realize the recycling of the acid. During the cleaning process, the composite sensor 407 in the acid storage tank 403 continuously monitors the parameters of the acid, such as concentration changes. If the acid concentration decreases and affects the cleaning effect, new acid can be added or the cleaning parameters can be adjusted according to the situation. During the cleaning process, the cleaning time can be set by the PLC controller or the data of the composite sensor 407 in the acid storage tank 403 (such as impurity content) can be used to determine whether the cleaning is completed. After the cleaning is completed, the flushing valve 202 and the reflux valve 406 are closed, the acid circulation pump 401 is also closed, and then the inlet valve 104 on the feed pipe 101 and the clear liquid valve 105 on the discharge pipe 102 are opened, the feeding of the lithium carbonate solution is restarted, and the filtering device resumes normal filtering work. At the same time, the PLC controller continues to monitor the data of the pressure sensor 301 to ensure the stable operation of the filtration process.

[0036] The above is an exemplary description of the present invention in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A lithium carbonate filtering device, comprising a filtering tank (1), characterized in that The filter tank (1) is connected to a cleaning system (2) and is also provided with a monitoring system (3); The cleaning system (2) comprises a flushing port (201), the flushing port (201) being arranged on the filter tank body (1) and being provided with a flushing valve (202), one end of the flushing port (201) being located outside the filter tank body (1) and being connected to an acid liquid circulation cleaning mechanism (4), and the other end of the flushing port (201) being located inside the filter tank body (1) and being connected to a flushing pipe (203), the flushing pipe (203) being an annular pipe and having flushing nozzles (5) distributed in a circular pattern thereon.

2. A lithium carbonate filtering device according to claim 1, characterized in that, The flushing nozzle (5) comprises a housing (501), wherein a fixed cover (502), a water wheel (503), a nozzle (504) and a spray hole (505) are arranged in sequence from the back to the front of the housing (501), wherein the fixed cover (502) is detachably mounted at the rear of the housing (501), wherein the water wheel (503) is rotatably mounted in the housing (501), wherein a water wheel ball head (506) is arranged at the front end of the water wheel (503), wherein the axis of the water wheel ball head (506) is aligned with the axis of the water wheel (501). 03) is eccentrically rotated, the front end of the nozzle (504) is provided with a nozzle ball head (507), a movable sealing assembly is formed between the nozzle ball head (507) and the spray hole (505), and a nozzle hole (508) is provided in the nozzle (504) along the axis line, the front end of the nozzle hole (508) passes through the nozzle ball head (507) and is connected to the spray hole (505) to form water outlet, and in addition, the water wheel ball head (506) is movably assembled in the rear end of the nozzle hole (508).

3. A lithium carbonate filtering device according to claim 2, characterized in that, The front end of the fixed cover (502) is provided with a rotating shaft (509) extending forward along the axis, and the fixed cover (502) is also provided with a water inlet hole (510) penetrating the rotating shaft (509) along the axis. The water wheel (503) is provided with a water wheel hole (511) penetrating along the axis. The water wheel (503) is rotatably connected to the rotating shaft (509) through the rear end of the water wheel hole (511). In addition, the front end of the water wheel hole (511) penetrates the water wheel ball head (506).

4. A lithium carbonate filtering device according to claim 3, characterized in that, A water cavity (512) is provided on the front end surface of the fixed cover (502). The fixed cover (502) is provided with a plurality of inclined water inlet holes (513) uniformly distributed around the circumference of the water inlet hole (510) as the center. The inclined water inlet holes (513) are inclined in the same clockwise direction and connected to the water cavity (512). The plurality of blades (514) of the water wheel (503) are arranged in the water cavity (512).

5. A lithium carbonate filtering device according to claim 1, characterized in that, The acid liquid circulation cleaning mechanism (4) comprises an acid liquid circulation pump (401), the acid liquid circulation pump (401) being connected to an acid liquid storage tank (403) via an acid liquid pipeline (402), the acid liquid storage tank (403) being connected to an acid liquid filter assembly (404), the acid liquid filter assembly (404) being connected to a reflux port (405) via an acid liquid pipeline (402), the reflux port (405) being located in the filter tank body (1) and being provided with a reflux valve (406), and a composite sensor (407) being provided on the acid liquid storage tank (403).

6. A lithium carbonate filtering device according to claim 1, characterized in that, The filter tank body (1) is provided with a feed pipe (101) and a discharge pipe (102), and a filter element (103) is provided inside the filter tank body (1), wherein the filter element (103) divides the filter tank body (1) into an upper chamber and a lower chamber.

7. A lithium carbonate filtering device according to claim 6, characterized in that: The feed pipe (101) is arranged in the lower cavity of the filter tank body (1), and a liquid inlet valve (104) is also arranged on the feed pipe (101); the discharge pipe (102) is installed in the upper cavity of the filter tank body (1), and a clear liquid valve (105) is arranged on the discharge pipe (102).

8. A lithium carbonate filtering device according to claim 6, characterized in that: The filter element (103) is a multi-layer composite structure, wherein the outer layer is a coarse filter screen (106), the middle layer is a fine filter screen (107), and the inner layer is a support layer (108).

9. A lithium carbonate filtering device according to claim 6, characterized in that: The monitoring system (3) comprises two pressure sensors (301), and the two pressure sensors (301) are respectively arranged on the feed pipe (101) and the discharge pipe (102).

10. A lithium carbonate filtering device according to claim 7, characterized in that: The liquid inlet valve (104), liquid clearing valve (105), flushing valve (202) and reflux valve (406) are all solenoid valves, and are all electrically connected to the PLC controller.

Images