Waste acid purification and recovery device

Abstract

The invention relates to a waste acid purification and recovery device, and relates to the technical field of wastewater treatment, the waste acid purification and recovery device comprises a main cylinder, a filter cylinder and a recovery cylinder, a filter screen is arranged in the filter cylinder, a connecting pipe is arranged between the main cylinder and the filter cylinder, one end of the connecting pipe is communicated with the bottom end of the main cylinder, and the other end is communicated with the bottom end of the filter cylinder; a communicating pipe is arranged between the recycling cylinder and the filter cylinder, one end of the communicating pipe is communicated with the filter cylinder, the other end of the communicating pipe is communicated with the recycling cylinder, a waste acid pump is arranged on the connecting pipe, the filter screen is arranged in the filter cylinder, a gear motor is arranged at the top end of the filter cylinder, a connecting shaft is fixedly connected to the filter screen, and an output shaft of the gear motor is coaxially and fixedly connected with the connecting shaft. The top end of the filter cartridge is communicated with a liquid inlet pipe, the bottom end of the filter cartridge is communicated with a liquid outlet pipe, and both the liquid inlet pipe and the liquid outlet pipe are provided with water valves. The gear motor drives the filter screen to rotate, and then the cleaning liquid is added to clean the filter screen, so that the cleaning efficiency of the filter screen is improved, and the purification and recovery efficiency of waste acid is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a waste acid purification and recovery device. Background Art

[0002] In industrial production, waste acid is generated during the nitration, esterification, sulfonation or alkylation of organic matter and the pickling of steel. The waste acid contains a large amount of solid impurities and metal ions, and direct discharge will seriously pollute the environment. Therefore, the waste acid needs to be purified and recovered.

[0003] Related technologies can refer to the patent application with publication number CN208022801U, which discloses a device for purifying and recovering waste acid from pickling, including a filter pressure, the filter pressure is connected to a filter through a pipeline, and a filter screen is provided inside the filter; the filter is connected to a waste acid circulation tank through a pipeline, and an overflow port is provided at one end of the waste acid circulation tank, and the overflow port is connected to a vortex generator, and the vortex generator is provided with a high-pressure gas inlet and a low-pressure gas outlet, and a liquid outlet is provided between the high-pressure gas inlet and the low-pressure gas outlet, and the liquid outlet is connected to a resin bed. This application can recycle acid, avoid waste of resources, and protect the environment.

[0004] With regard to the above-mentioned related technologies, after long-term use, the filter mesh in the filter will accumulate a large amount of impurities and pollutants, causing the pores of the filter mesh to be clogged. Therefore, there is an urgent need for a waste acid purification and recovery device that is easy to clean the filter mesh in the filter to solve the above problem, thereby improving the waste acid treatment efficiency. Summary of the invention

[0005] In order to improve the treatment efficiency of waste acid, the present invention provides a waste acid purification and recovery device.

[0006] The present invention provides a waste acid purification and recovery device, which adopts the following technical scheme: A waste acid purification and recovery device comprises a main cylinder, a filter cylinder and a recovery cylinder. A flat membrane is arranged in the filter cylinder. A connecting pipe is arranged between the main cylinder and the filter cylinder. One end of the connecting pipe is connected to the bottom end of the main cylinder, and the other end is connected to the bottom end of the filter cylinder. A connecting pipe is arranged between the recovery cylinder and the filter cylinder. One end of the connecting pipe is connected to the top end of the filter cylinder, and the other end is connected to the recovery cylinder. A waste acid pump is arranged on the connecting pipe. The flat membrane is vertically arranged in the filter cylinder, one side of the flat membrane faces the connecting pipe, and the other side faces the connecting pipe. A reduction motor is arranged on the top end of the filter cylinder. A connecting shaft is fixedly connected to the center of the upper end surface of the flat membrane. The output shaft of the reduction motor passes through the filter cylinder and is coaxially fixedly connected to the connecting shaft. The top end of the filter cylinder is connected to a liquid inlet pipe, and the bottom end of the filter cylinder is connected to a liquid outlet pipe. Water valves are arranged on the liquid inlet pipe and the liquid outlet pipe.

[0007] By adopting the above technical scheme, when waste acid purification and recovery is required, the staff first adds the waste acid into the main cylinder for storage, and then starts the waste acid pump on the connecting pipe to allow the waste acid to enter the filter cylinder, and the waste acid is filtered through the flat membrane, and then recovered into the recovery cylinder. After the waste acid is purified and recovered, the staff adds a cleaning agent from the liquid inlet pipe, and then starts the reduction motor, which drives the flat membrane to rotate, thereby cleaning the flat membrane. After cleaning, the liquid outlet pipe is opened to discharge the waste water, and the reduction motor is started again to complete the reset, thereby achieving the effect of automatically cleaning the flat membrane, which is beneficial to improving the subsequent waste acid treatment efficiency.

[0008] Optionally, the upper end surface of the main cylinder is connected to a waste acid pipe, a filter screen is provided in the main cylinder, the filter screen is horizontally arranged in the main cylinder, a slide groove is provided on the main cylinder, the filter screen is located at the slide groove of the main cylinder, a handle is provided on the side of the filter screen away from the slide groove, the handle is fixedly connected to the filter screen, and a feeding pipe is connected to one side of the main cylinder, and the feeding pipe is located below the filter screen.

[0009] By adopting the above technical solution, when the waste acid is purified and recovered, the waste acid enters the main cylinder from the waste acid pipe, during which it will be initially filtered through the filter net, and large particles of impurities will be retained on the filter net, thereby improving the purity of the waste acid and facilitating the subsequent purification and recovery efficiency of the waste acid. When the impurities accumulate to a certain extent, the staff can pull the handle to disassemble the filter net, which is convenient for subsequent cleaning and replacement, and is conducive to improving work efficiency.

[0010] Optionally, a support block is provided at the bottom end of the filter cartridge, the support block is vertically arranged in the filter cartridge, the support block is extended along the width direction of the filter screen, the lower end surface of the flat membrane is slidably connected to the support block, and rotating shafts are provided on both sides of the support block. The two rotating shafts are arranged opposite to each other, the rotating shafts are vertically arranged on the bottom surface of the filter cartridge, and a plurality of stirring blades are provided on the rotating shafts.

[0011] By adopting the above technical solution, when the flat membrane needs to be cleaned, detergent or clean water is first added to the filter cartridge through the liquid inlet pipe. The staff starts the reduction motor, which drives the flat membrane to rotate a certain angle. Then the rotating shaft is started, which drives the stirring blades to rotate. The fluidity and turbulence of the water are increased by stirring, making the water flow more uniform and intense, thereby more effectively removing pollutants on the membrane surface.

[0012] Optionally, the height of the stirring blade is lower than the height of the supporting block, and the stirring blade is located below the flat membrane.

[0013] By adopting the above technical solution, the stirring blade can avoid collision with the flat membrane when working, thereby improving the safety of the device.

[0014] Optionally, a connecting rod is fixedly connected at the center of the lower end surface of the flat membrane, a control rod is provided at one end of the connecting rod away from the flat membrane, the control rod is horizontally arranged, and the control rod extends along the width direction of the flat membrane. A movable groove is provided at the bottom end of the filter cartridge, and the movable groove is located below the inner surface of the bottom of the filter cartridge. The control rod is horizontally located at the movable groove of the filter cartridge. Movable holes are provided at both ends of the control rod, and a rotating block is provided in the movable hole. Connecting grooves are provided at the top and bottom ends of the rotating block, and a clamping block is provided in the connecting groove. A connecting spring is provided between the clamping block and the rotating block. Two driving motors are provided at the bottom end of the filter cartridge, and the two driving motors are located below the control rod. The output shaft of the driving motor is correspondingly arranged, and a clamping groove is provided on the side of the output shaft and the rotating shaft close to the control rod, and the clamping groove is connected with the movable groove. When the rotating block is located below the rotating shaft, the clamping block is located at the clamping groove.

[0015] By adopting the above technical solution, when it is necessary to control the rotation of the stirring blade, the staff starts the reduction motor, and the reduction motor drives the flat membrane to rotate 90 degrees. At this time, the control rod rotates synchronously with the flat membrane, so that the rotating block is located below the rotating shaft, and under the elastic force of the connecting spring, the clamping block in the rotating block pops out and extends into the clamping groove, and the clamping block is clamped in the clamping groove. At this time, the connection between the rotating shaft and the output shaft of the drive motor is completed through the rotating block. At this time, the drive motor is started to drive the stirring blade to rotate, so that when cleaning the flat membrane, the stirring blade continues to rotate. After cleaning, the stirring blade stops rotating. The division of labor is clear, which is conducive to improving the cleaning efficiency.

[0016] Optionally, the clamping block includes a spherical portion and a clamping portion, the shape and size of the clamping groove are consistent with the shape and size of the spherical portion, and the clamping portion is clamped at the connecting groove of the rotating block.

[0017] By adopting the above technical solution, when the clamping block is clamped in the clamping groove, the clamping part is clamped in the connecting groove of the rotating block, ensuring that the clamping part can rotate, and the spherical part is located at the clamping groove to ensure the connection stability of the rotating shaft and the output shaft.

[0018] Optionally, a pressure sensor is provided at the clamping groove of the rotating shaft.

[0019] By adopting the above technical solution, when the spherical part is located at the clamping groove, the pressure sensor receives the pressure signal, and the drive motor is started at this time, thereby driving the stirring blade to rotate. When the spherical part is out of the clamping groove, the pressure sensor signal changes, thereby stopping the drive motor. The logic is clear, the operation is easy, and it is conducive to improving work efficiency.

[0020] Optionally, a cross bar is fixedly connected to the connecting shaft, and the cross bar is extended along the width direction of the flat membrane. Ventilation holes are provided on both sides of the filter cartridge, and the two ends of the cross bar are respectively opposite to the two ventilation holes of the filter cartridge. Sealing rubber blocks are provided at both ends of the cross bar, and the sealing rubber blocks are located at the ventilation holes of the filter cartridge.

[0021] By adopting the above technical solution, when the flat membrane needs to be cleaned, the staff starts the reduction motor, which drives the flat membrane to rotate, thereby driving the cross bar to rotate, thereby opening the ventilation holes, and the waste gas generated during the cleaning process is collected through the ventilation holes, ensuring the stability of the waste acid purification and recovery environment inside the filter cartridge. The setting of the sealing rubber block further improves the sealing of the ventilation holes when they are sealed.

[0022] In summary, the present invention includes at least one of the following beneficial technical effects: 1. By setting the support block, rotating shaft and stirring blades, when the flat membrane needs to be cleaned, first add detergent or clean water into the filter cylinder through the liquid inlet pipe, and the staff starts the reduction motor, which drives the flat membrane to rotate a certain angle, and then starts the rotating shaft, which drives the stirring blades to rotate. The fluidity and turbulence of the water are increased by stirring, making the water flow more uniform and intense, thereby more effectively removing pollutants on the membrane surface; 2. By setting the crossbar, ventilation holes and sealing rubber blocks, when the flat membrane needs to be cleaned, the staff starts the reduction motor, which drives the flat membrane to rotate, thereby driving the crossbar to rotate, thereby opening the ventilation holes. The waste gas generated during the cleaning process is collected through the ventilation holes to ensure the stability of the waste acid purification and recovery environment inside the filter cartridge. The setting of the sealing rubber block further improves the sealing of the ventilation holes when they are sealed; 3. By setting a pressure sensor, when the spherical part is located at the clamping groove, the pressure sensor receives a pressure signal, and then starts the drive motor, thereby driving the stirring blade to rotate. When the spherical part is out of the clamping groove, the pressure sensor signal changes, thereby stopping the drive motor. The logic is clear, easy to operate, and conducive to improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The utility model is a schematic diagram of the overall structure of a waste acid purification and recovery device.

[0024] Figure 2 The present invention is a schematic diagram of the cross-sectional structure of a waste acid purification and recovery device.

[0025] Figure 3 It is a schematic diagram of the structure inside the filter cartridge.

[0026] Figure 4 It is a partial structural diagram of the control rod.

[0027] Figure 5 yes Figure 4 Enlarged schematic diagram of part A.

[0028] Figure 6 It is a structural schematic diagram of the positional relationship between the rotating shaft and the output shaft of the driving motor.

[0029] Description of reference numerals: 1. storage assembly; 11. main cylinder; 12. recovery cylinder; 13. waste acid pipe; 14. filter screen; 15. handle; 16. feeding pipe; 17. connecting pipe; 18. connecting pipe; 2. purification assembly; 21. filter cylinder; 22. flat membrane; 23. waste acid pump; 24. reduction motor; 25. connecting shaft; 251. cross bar; 252. ventilation hole; 253. sealing rubber block; 26. liquid inlet pipe ; 27. Liquid outlet pipe; 3. Cleaning component; 31. Support block; 32. Rotating shaft; 33. Driving motor; 34. Stirring blade; 35. Control rod; 351. Movable hole; 352. Rotating block; 353. Connecting groove; 354. Snap-in block; 3541. Spherical part; 3542. Snap-in part; 3543. Pressure sensor; 355. Connecting spring; 36. Moving groove; 37. Clamping groove; 38. Connecting rod. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with all the accompanying drawings.

[0031] The embodiment of the invention discloses a waste acid purification and recovery device.

[0032] Reference Figure 1 to Figure 6 A waste acid purification and recovery device comprises a storage component 1, a purification component 2 and a cleaning component 3, wherein the storage component 1 and the purification component 2 are connected, and the cleaning component 3 is arranged in the purification component 2. The storage component 1 stores the waste acid and the waste acid after purification and recovery, the purification component 2 realizes the purification of the waste acid, and the cleaning component 3 cleans the purification component 2.

[0033] Reference Figure 1 to Figure 6 The storage assembly 1 includes a main cylinder 11 and a recovery cylinder 12. The upper end surface of the main cylinder 11 is connected to a waste acid pipe 13. A filter screen 14 is provided in the main cylinder 11. The filter screen 14 is horizontally arranged in the main cylinder 11. A chute is provided on the main cylinder 11. The filter screen 14 is located at the chute of the main cylinder 11. A handle 15 is provided on the side of the filter screen 14 away from the chute. The handle 15 is fixedly connected to the filter screen 14. A feeding pipe 16 is connected to one side of the main cylinder 11. The feeding pipe 16 is located below the filter screen 14. A connecting pipe 17 is provided between the main cylinder 11 and the purification assembly 2. A connecting pipe 18 is provided between the recovery cylinder 12 and the purification assembly 2. By providing the feeding pipe 16, the staff can add a precipitant from the feeding pipe 16 to form an insoluble precipitate of the metal ions in the waste acid, and then perform solid-liquid separation, thereby further improving the filtering effect.

[0034] Reference Figure 1 to Figure 6When the waste acid is purified and recovered, the waste acid enters the main cylinder 11 from the waste acid pipe 13, during which it will be initially filtered through the filter screen 14, and large particles of impurities will be trapped on the filter screen 14, which improves the purity of the waste acid and is beneficial to improving the subsequent purification and recovery efficiency of the waste acid. When the impurities accumulate to a certain extent, the staff pulls the handle 15 to disassemble the filter screen 14, which is convenient for subsequent cleaning and replacement, and is beneficial to improving work efficiency.

[0035] Reference Figure 1 to Figure 6 The purification component 2 includes a filter cartridge 21, in which a flat membrane 22 is arranged. One end of the connecting pipe 17 is connected to the bottom end of the main cylinder 11, and the other end is connected to the bottom end of the filter cartridge 21. One end of the connecting pipe 18 is connected to the top end of the filter cartridge 21, and the other end is connected to the recovery cylinder 12. A waste acid pump 23 is arranged on the connecting pipe 17. The flat membrane 22 is vertically arranged in the filter cartridge 21. One side of the flat membrane 22 faces the connecting pipe 17, and the other side faces the connecting pipe 18. A reduction motor 24 is arranged on the top end of the filter cartridge 21. A connecting shaft 25 is fixedly connected to the center of the upper end surface of the flat membrane 22. The output shaft of the reduction motor 24 passes through the filter cartridge 21 and is coaxially fixedly connected to the connecting shaft 25. The top end of the filter cartridge 21 is connected to a liquid inlet pipe 26, and the bottom end of the filter cartridge 21 is connected to a liquid outlet pipe 27. Water valves are arranged on the liquid inlet pipe 26 and the liquid outlet pipe 27. The flat membrane 22 adopts a special flat acid-resistant membrane with strong anti-fouling and clogging ability and high pressure resistance level, which retains impurities on one side and allows acid to pass through the membrane to the other side, thereby separating the acid from the impurities and obtaining a relatively pure acid.

[0036] Reference Figure 1 to Figure 6 When the waste acid needs to be purified and recovered, the staff first adds the waste acid into the main cylinder 11 for storage, and then starts the waste acid pump 23 on the connecting pipe 17 to allow the waste acid to enter the filter cylinder 21, so that the waste acid is filtered through the flat membrane 22 and then recovered into the recovery cylinder 12. After the waste acid is purified and recovered, the staff adds a cleaning agent from the liquid inlet pipe 26, and then starts the reduction motor 24. The reduction motor 24 drives the flat membrane 22 to rotate, thereby cleaning the flat membrane 22. After cleaning, the liquid outlet pipe 27 is opened to discharge the waste water, and the reduction motor 24 is started again to complete the reset, thereby achieving the effect of automatically cleaning the flat membrane 22, which is beneficial to improving the subsequent waste acid treatment efficiency.

[0037] Reference Figure 1 to Figure 6The cleaning assembly 3 includes a support block 31, two rotating shafts 32 and two driving motors 33. The support block 31 is arranged at the bottom end of the filter cartridge 21. The support block 31 is vertically arranged in the filter cartridge 21. The support block 31 is extended along the width direction of the filter screen 14. The lower end surface of the flat membrane 22 is slidably connected to the support block 31. The two rotating shafts 32 are relatively arranged on both sides of the support block 31. The rotating shaft 32 is vertically arranged on the bottom surface of the filter cartridge 21. A plurality of stirring blades 34 are arranged on the rotating shaft 32. A connecting rod 38 is fixedly connected to the center of the lower end surface of the flat membrane 22. A control rod 35 is arranged at one end of the connecting rod 38 away from the flat membrane 22. The control rod 35 is horizontally arranged and extends along the width direction of the flat membrane 22. A moving groove 36 is opened at the bottom end of the filter cartridge 21. The moving groove 36 is located in the filter cartridge 2 1, the control rod 35 is horizontally located at the moving groove 36 of the filter cartridge 21, and both ends of the control rod 35 are provided with movable holes 351, and a rotating block 352 is arranged in the movable hole 351. The top and bottom ends of the rotating block 352 are provided with connecting grooves 353, and a clamping block 354 is arranged in the connecting groove 353. A connecting spring 355 is arranged between the clamping block 354 and the rotating block 352. Two driving motors 33 are arranged at the bottom end of the filter cartridge 21. The two driving motors 33 are located below the control rod 35. The output shafts of the driving motors 33 are correspondingly arranged with the rotating shaft 32. The output shaft and the rotating shaft 32 are both provided with a clamping groove 37 on one side close to the control rod 35. The clamping groove 37 is communicated with the moving groove 36. When the rotating block 352 is located below the rotating shaft 32, the clamping block 354 is located at the clamping groove 37.

[0038] Reference Figure 1 to Figure 6 When the flat membrane 22 needs to be cleaned, detergent or clean water is first added into the filter cartridge 21 through the liquid inlet pipe 26. The staff starts the reduction motor 24, and the reduction motor 24 drives the flat membrane 22 to rotate 90 degrees. At this time, the control rod 35 rotates synchronously with the flat membrane 22, so that the rotating block 352 is located below the rotating shaft 32, and under the elastic force of the connecting spring 355, the clamping block 354 in the rotating block 352 pops out and extends into the clamping groove 37, and the clamping block 354 is clamped in the clamping groove 37. At this time, the connection between the rotating shaft 32 and the output shaft of the driving motor 33 is completed by the rotating block 352. At this time, the driving motor 33 is started to drive the stirring blade 34 to rotate, so that when the flat membrane 22 is cleaned, the stirring blade 34 continues to rotate. After the cleaning is completed, the stirring blade 34 stops rotating. The clear division of labor is conducive to improving the cleaning efficiency. The fluidity and turbulence of the water are increased by stirring, so that the water flow is more uniform and intense, thereby more effectively removing pollutants on the membrane surface.

[0039] Reference Figure 1 to Figure 6The height of the stirring blade 34 is lower than the height of the support block 31, and the stirring blade 34 is located below the flat membrane 22. When the stirring blade 34 is working, it can avoid collision with the flat membrane 22, thereby improving the safety of the device.

[0040] Reference Figure 1 to Figure 6 The clamping block 354 includes a spherical portion 3541 and a clamping portion 3542. The shape and size of the clamping groove 37 are consistent with the shape and size of the spherical portion 3541. The clamping portion 3542 is clamped at the connecting groove 353 of the rotating block 352. A pressure sensor 3543 is provided at the clamping groove 37 of the rotating shaft 32. When the clamping block 354 is clamped in the clamping groove 37, the clamping part 3542 is clamped in the connecting groove 353 of the rotating block 352, ensuring that the clamping part 3542 can rotate. The spherical part 3541 is located at the clamping groove 37 to ensure the connection stability between the rotating shaft 32 and the output shaft. When the spherical part 3541 is located at the clamping groove 37, the pressure sensor 3543 receives the pressure signal, and the driving motor 33 is started at this time, thereby driving the stirring blade 34 to rotate. When the spherical part 3541 is out of the clamping groove 37, the signal of the pressure sensor 3543 changes, thereby stopping the driving motor 33. The logic is clear and the operation is easy, which is conducive to improving work efficiency.

[0041] Reference Figure 1 to Figure 6 A crossbar 251 is fixedly connected to the connecting shaft 25, and the crossbar 251 is extended along the width direction of the flat membrane 22. Ventilation holes 252 are provided on both sides of the filter cartridge 21, and the two ends of the crossbar 251 are respectively opposite to the two ventilation holes 252 of the filter cartridge 21. Sealing rubber blocks 253 are provided at both ends of the crossbar 251, and the sealing rubber blocks 253 are located at the ventilation holes 252 of the filter cartridge 21. When the flat membrane 22 needs to be cleaned, the staff starts the reduction motor 24, and the reduction motor 24 drives the flat membrane 22 to rotate, thereby driving the crossbar 251 to rotate, thereby opening the ventilation holes 252, and the waste gas generated during the cleaning process is collected through the ventilation holes 252 to ensure the stability of the waste acid purification and recovery environment inside the filter cartridge 21. The setting of the sealing rubber block 253 further improves the sealing performance of the ventilation holes 252 when they are sealed.

[0042] The implementation principle of a waste acid purification and recovery device according to an embodiment of the present invention is as follows: when the flat membrane 22 needs to be cleaned, a detergent or clean water is first added to the filter cartridge 21 through the liquid inlet pipe 26, and the staff starts the reduction motor 24, which drives the flat membrane 22 to rotate 90 degrees. At this time, the control rod 35 rotates synchronously with the flat membrane 22, so that the rotating block 352 is located below the rotating shaft 32, and under the elastic force of the connecting spring 355, the clamping block 354 in the rotating block 352 pops out and extends into the clamping groove 37, and the clamping block 354 is clamped at the clamping groove 37. At this time, the connection between the rotating shaft 32 and the output shaft of the driving motor 33 is completed by the rotating block 352. At this time, the driving motor 33 is started to drive the stirring blade 34 to rotate, so that when the flat membrane 22 is cleaned, the stirring blade 34 continues to rotate. After the cleaning is completed, the stirring blade 34 stops rotating. The clear division of labor is conducive to improving the cleaning efficiency, and the fluidity and turbulence of the water are increased by stirring, so that the water flow is more uniform and intense, thereby more effectively removing pollutants on the membrane surface.

[0043] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A waste acid purification and recovery device, comprising a main cylinder (11), a filter cylinder (21) and a recovery cylinder (12), wherein a flat membrane (22) is provided in the filter cylinder (21), and characterized in that: A connecting pipe (17) is provided between the main cylinder (11) and the filter cylinder (21), one end of the connecting pipe (17) is connected to the bottom end of the main cylinder (11), and the other end is connected to the bottom end of the filter cylinder (21). A connecting pipe (18) is provided between the recovery cylinder (12) and the filter cylinder (21), one end of the connecting pipe (18) is connected to the top end of the filter cylinder (21), and the other end is connected to the recovery cylinder (12). A waste acid pump (23) is provided on the connecting pipe (17). A flat membrane (22) is vertically arranged in the filter cylinder (21). The flat membrane (22) One side of the filter cartridge (22) faces the connecting pipe (17), and the other side faces the connecting pipe (18). A reduction motor (24) is provided at the top of the filter cartridge (21). A connecting shaft (25) is fixedly connected to the center of the upper end surface of the flat membrane (22). The output shaft of the reduction motor (24) passes through the filter cartridge (21) and is coaxially fixedly connected to the connecting shaft (25). The top of the filter cartridge (21) is connected to a liquid inlet pipe (26), and the bottom of the filter cartridge (21) is connected to a liquid outlet pipe (27). Water valves are provided on the liquid inlet pipe (26) and the liquid outlet pipe (27).

2. A waste acid purification and recovery device according to claim 1, characterized in that: The upper end surface of the main cylinder (11) is connected to a waste acid pipe (13). A filter screen (14) is provided inside the main cylinder (11). The filter screen (14) is horizontally arranged inside the main cylinder (11). A chute is provided on the main cylinder (11). The filter screen (14) is located at the chute of the main cylinder (11). A handle (15) is provided on the side of the filter screen (14) away from the chute. The handle (15) is fixedly connected to the filter screen (14). A feeding pipe (16) is connected to one side of the main cylinder (11). The feeding pipe (16) is located below the filter screen (14).

3. A waste acid purification and recovery device according to claim 2, characterized in that: A support block (31) is provided at the bottom end of the filter cartridge (21). The support block (31) is vertically arranged in the filter cartridge (21). The support block (31) is extended along the width direction of the filter screen (14). The lower end surface of the flat membrane (22) is slidably connected to the support block (31). Rotating shafts (32) are provided on both sides of the support block (31). The two rotating shafts (32) are arranged opposite to each other. The rotating shafts (32) are vertically arranged on the bottom surface of the filter cartridge (21). A plurality of stirring blades (34) are provided on the rotating shaft (32).

4. A waste acid purification and recovery device according to claim 3, characterized in that: The height of the stirring blade (34) is lower than the height of the support block (31), and the stirring blade (34) is located below the flat membrane (22).

5. A waste acid purification and recovery device according to claim 4, characterized in that: A connecting rod (38) is fixedly connected at the center of the lower end surface of the flat membrane (22); a control rod (35) is provided at one end of the connecting rod (38) away from the flat membrane (22); the control rod (35) is arranged horizontally and extends along the width direction of the flat membrane (22); a movable groove (36) is provided at the bottom end of the filter cartridge (21); the movable groove (36) is located below the inner surface of the bottom of the filter cartridge (21); the control rod (35) is horizontally located at the movable groove (36) of the filter cartridge (21); movable holes (351) are provided at both ends of the control rod (35); a rotating block (352) is provided in the movable hole (351); the top and bottom ends of the rotating block (352) are both opened. A connecting groove (353) is provided, a clamping block (354) is provided in the connecting groove (353), a connecting spring (355) is provided between the clamping block (354) and the rotating block (352), two driving motors (33) are provided at the bottom end of the filter cartridge (21), the two driving motors (33) are located below the control rod (35), the output shafts of the driving motors (33) and the rotating shaft (32) are arranged correspondingly, a clamping groove (37) is provided on one side of the output shaft and the rotating shaft (32) close to the control rod (35), the clamping groove (37) is connected to the moving groove (36), and when the rotating block (352) is located below the rotating shaft (32), the clamping block (354) is located at the clamping groove (37).

6. A waste acid purification and recovery device according to claim 5, characterized in that: The clamping block (354) comprises a spherical portion (3541) and a clamping portion (3542); the shape and size of the clamping groove (37) are consistent with the shape and size of the spherical portion (3541); and the clamping portion (3542) is clamped at the connecting groove (353) of the rotating block (352).

7. A waste acid purification and recovery device according to claim 6, characterized in that: A pressure sensor (3543) is provided at the clamping groove (37) of the rotating shaft (32).

8. A waste acid purification and recovery device according to claim 1, characterized in that: A cross bar (251) is fixedly connected to the connecting shaft (25), and the cross bar (251) is extended along the width direction of the flat membrane (22). Ventilation holes (252) are provided on both sides of the filter cartridge (21), and the two ends of the cross bar (251) are respectively opposite to the two ventilation holes (252) of the filter cartridge (21). Sealing rubber blocks (253) are provided at both ends of the cross bar (251), and the sealing rubber blocks (253) are located at the ventilation holes (252) of the filter cartridge (21).

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