Electroplating wastewater recovery system and method

Abstract

The invention discloses an electroplating wastewater recovery system and method, and belongs to the field of electroplating wastewater treatment.The electroplating wastewater recovery system comprises a resin adsorption device, a membrane concentration device, an electrolytic tank, a mixing tank, an immersed ultrafiltration membrane tank, electrodialysis equipment, reverse osmosis equipment and bipolar membrane electrodialysis equipment; a concentrated solution outlet of the membrane concentration device is communicated with the electrolytic tank, a dialysate outlet of the resin adsorption device, a permeate outlet of the membrane concentration device and a residual liquid outlet of the electrolytic tank are all communicated with the mixing tank, a water outlet of the mixing tank is communicated with the immersed ultrafiltration membrane tank, and a filtrate outlet of the immersed ultrafiltration membrane tank is communicated with the electrodialysis equipment. A desalted liquid outlet of the electrodialysis equipment is communicated with the reverse osmosis equipment, a concentrated liquid outlet of the electrodialysis equipment is communicated with the bipolar membrane electrodialysis equipment, and an alkali liquid outlet of the bipolar membrane electrodialysis equipment is communicated with the immersed ultrafiltration membrane pool. According to the method, not only are valuable metals obtained, but also acid liquor and alkali liquor are obtained.

Description

Technical Field

[0001] The invention belongs to the field of electroplating wastewater treatment, and in particular relates to an electroplating wastewater recovery system and method. Background Art

[0002] With the rapid development of modern industry, the electroplating industry, as an important part of the manufacturing industry, has increasingly prominent problems with wastewater generated in its production process. Electroplating wastewater is a complex industrial wastewater containing heavy metal ions and other harmful substances. If not handled properly, it will not only cause serious pollution to the natural environment, but also accumulate through the food chain, ultimately threatening human health.

[0003] The integrated electroplating wastewater treatment equipment with application number CN202411025804.7 includes a main control box, a pretreatment cylinder, a centrifugal outer cylinder, and a recovery cylinder. The pretreatment cylinder, the centrifugal outer cylinder, and the recovery cylinder are all arranged at the top of the main control box. The interior of the pretreatment cylinder is provided with a pretreatment mechanism with a filtering and slag removal mechanism, the interior of the centrifugal outer cylinder is provided with a deep purification mechanism with a microprocessing mechanism, and the interior of the recovery cylinder is provided with an electrolytic recovery mechanism with a ventilation mechanism. It recovers heavy metal ions by electrolysis, but does not perform subsequent treatment on the electrolytic residual liquid and other treatment liquids, and the resource treatment of electroplating wastewater is insufficient. Summary of the invention

[0004] The purpose of the present invention is to provide an electroplating wastewater recovery system and method to overcome at least one of the above-mentioned defects in the prior art.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The electroplating wastewater recovery system provided by the present invention comprises a resin adsorption device, a membrane concentration device, an electrolytic cell, a mixing tank, an immersed ultrafiltration membrane pool, an electrodialysis device, a reverse osmosis device, and a bipolar membrane electrodialysis device, wherein the eluate outlet of the resin adsorption device is connected to the membrane concentration device, the concentrated liquid outlet of the membrane concentration device is connected to the electrolytic cell, the dialysate outlet of the resin adsorption device, the permeate outlet of the membrane concentration device, and the residual liquid outlet of the electrolytic cell are all connected to the mixing tank, the water outlet of the mixing tank is connected to the immersed ultrafiltration membrane pool, the filtrate outlet of the immersed ultrafiltration membrane pool is connected to the electrodialysis device, the desalinated liquid outlet of the electrodialysis device is connected to the reverse osmosis device, and the concentrated liquid outlet of the electrodialysis device is connected to the reverse osmosis device. The condensate outlet is connected to the bipolar membrane electrodialysis equipment, and the alkali solution outlet of the bipolar membrane electrodialysis equipment is connected to the immersed ultrafiltration membrane pool. The mixing tank includes a tank body, a liquid collecting component, a stirring component, and a first cylinder. The liquid collecting component and the stirring component are fixed on the top of the tank body, and the first cylinder is fixed inside the tank body. The stirring component has a first spiral blade, and the first spiral blade passes through the first cylinder. The first cylinder has a chamber inside. The inner wall of the first cylinder has a plurality of first spray holes, and the first spray holes are connected to the chamber. The stirring component has a second spray hole, and the second spray hole is located in the first cylinder. The liquid collecting component has two outlets, one of which is connected to the chamber, and the other outlet is connected to the second spray hole.

[0007] Preferably, the liquid collecting component includes a liquid collecting box, a partition, a first pipe, a second pipe, a first valve, a pressure pump, and a venturi tube. Two partitions are fixed inside the liquid collecting box, and the two partitions divide the internal space of the liquid collecting box into three liquid collecting chambers. The tops of the three liquid collecting chambers are respectively connected to the dialysate outlet of the resin adsorption device, the permeate outlet of the membrane concentration device, and the residual liquid outlet of the electrolytic cell. The bottom end of each liquid collecting chamber is fixedly connected to a first pipe, and the first pipe is provided with a first valve. The liquid outlet end of the first pipe of the leftmost liquid collecting chamber is connected to the liquid inlet end of the venturi tube, the liquid outlet end of the first pipe of the middle liquid collecting chamber is connected to the throat of the venturi tube, the liquid outlet end of the venturi tube is connected to the second spray hole through the second pipe, the liquid outlet end of the first pipe of the rightmost liquid collecting chamber is connected to the chamber, and the first pipe of the leftmost liquid collecting chamber, the first pipe of the rightmost liquid collecting chamber, and the second pipe are all provided with a pressure pump.

[0008] Preferably, the mixing tank also includes a second valve, a third valve, a first air inlet pipe, and a second air inlet pipe. The first pipe of the liquid collecting chamber located on the far right is fixedly connected to the first air inlet pipe, the first air inlet pipe is provided with a second valve, the first air inlet pipe is located below the pressure pump, and the first air inlet pipe is connected to an external air source. The second pipe is fixedly connected to the second air inlet pipe, the second air inlet pipe is provided with a second valve, the second air inlet pipe is located below the pressure pump, and the second air inlet pipe is connected to an external air source.

[0009] Preferably, the chamber is an annular chamber, the plurality of first spray holes include a plurality of spray hole groups spaced apart along the circumference of the chamber, each spray hole group includes a plurality of first spray holes spaced apart along the height direction of the first cylinder, and the first spray holes are arranged to be inclined upward.

[0010] Preferably, the stirring assembly also includes a motor, a transmission assembly, a first bearing seat, a hollow shaft, an L-shaped stirring frame, and a first stirring plate. The motor and the first bearing seat are fixed to the top of the tank body. The hollow shaft passes through the first bearing seat, the top wall of the tank body, and the first cylinder body, and is fixed with an L-shaped stirring frame. Several first stirring plates are fixed to the outside of the L-shaped stirring frame. The motor is connected to the hollow shaft through the transmission assembly. The bottom end of the second pipe extends into the hollow shaft. The hollow shaft has several second spray holes spaced apart along its length.

[0011] Preferably, a plurality of baffles spaced apart from each other are fixed to the inner side wall of the tank body, and a plurality of first stirring plates spaced apart from each other and staggered with the baffles.

[0012] Preferably, the first cylinder is fixed in the tank body through a transverse plate.

[0013] Preferably, the mixing tank also includes a sealed box, a second bearing seat, a first bevel gear, a third bearing seat, a second bevel gear, a rotating shaft, and a second stirring plate. A sealed box is fixed to the inner bottom wall of the tank body, a second bearing seat is fixed to the inner bottom wall of the sealed box, the bottom end of the hollow shaft passes through the top wall of the sealed box and is inserted into the second bearing seat, a first bevel gear is fixed to the lower part of the hollow shaft, the first bevel gear is located in the sealed box, a seal is set between the hollow shaft and the sealed box, third bearing seats are fixed to the left and right side walls of the sealed box, the inner end of the rotating shaft passes through the side wall of the sealed box and extends to the sealed box where a second bevel gear is fixed, the first bevel gear is meshed with the second bevel gear, a seal is set between the rotating shaft and the sealed box, a second stirring plate is fixed to the outer end of the rotating shaft, the second stirring plate is located below the first stirring plate and is perpendicular to the first stirring plate.

[0014] Preferably, the mixing tank also includes a second spiral blade and a second cylinder. The second cylinder is fixed on both sides of the bottom wall of the tank body. The second cylinder is located between the sealing box and the second stirring plate. The second spiral blade is fixed to the rotating shaft and passes through the second cylinder.

[0015] The present invention also provides an electroplating wastewater recovery method, which adopts the above-mentioned electroplating wastewater recovery system for recovery, and comprises the following steps: sending the electroplating wastewater into a resin adsorption device for resin adsorption treatment, sending the eluate obtained by the treatment into a membrane concentration device for membrane concentration treatment, sending the concentrated solution obtained by the treatment into an electrolytic cell for electrolysis treatment to obtain valuable metals, sending the dialysate obtained by the resin adsorption treatment, the permeate obtained by the membrane concentration treatment, and the residual liquid obtained by the electrolysis treatment into a liquid collecting component of a mixing tank for collection, sending the dialysate obtained by the resin adsorption treatment, the permeate obtained by the membrane concentration treatment, and the residual liquid obtained by the electrolysis treatment into a tank body through the liquid collecting component, and performing stirring and mixing treatment through a stirring component, sending the mixed solution after the mixing treatment into an immersed ultrafiltration membrane pool for ultrafiltration treatment, sending the filtrate obtained by the ultrafiltration treatment into an electrodialysis device for electrodialysis treatment, sending the desalinated liquid obtained by the treatment into a reverse osmosis device for reverse osmosis treatment to obtain produced water, sending the concentrated solution obtained by the treatment into a bipolar membrane electrodialysis device for electrodialysis treatment again to obtain acid solution and alkali solution, and the alkali solution is reused in the immersed ultrafiltration membrane pool.

[0016] The beneficial effects of the present invention are:

[0017] 1. Not only valuable metals are obtained, but also acid and alkali solutions are obtained, and the produced water meets the discharge standards.

[0018] 2. Achieve zero pollution discharge by treating the liquid in each step.

[0019] 3. Use a mixing tank to mix the dialysate obtained by resin adsorption treatment, the permeate obtained by membrane concentration treatment, and the residual liquid obtained by electrolysis treatment, and then send them into the submerged ultrafiltration membrane pool, so that the water quality of the mixed liquid is more uniform and stable, providing more favorable water quality conditions for subsequent treatment steps.

[0020] 4. Before stirring, use collision mixing method to carry out preliminary mixing to greatly improve mixing efficiency.

[0021] 5. By setting the first cylinder and the first spiral blade, the upper and lower layers can be circulated, thereby achieving a uniform mixing effect.

[0022] 6. During the rotation process, the first spiral blade not only promotes the flow of the mixed liquid, but also cuts and flips the mixed liquid, so that the mixed liquid is more fully mixed during the stirring process.

[0023] 7. Through the setting of the Venturi tube, the residual liquid obtained by the electrolysis treatment and the dialysate obtained by the resin adsorption treatment are mixed with each other during the transportation process to form a uniform mixed liquid.

[0024] 8. The residual liquid obtained by electrolysis treatment and the dialysate obtained by resin adsorption treatment are first mixed to form a mixed liquid, and then the mixed liquid is sprayed and collided with the permeate obtained by membrane concentration treatment through the first spray hole and the second spray hole respectively to perform the initial mixing of the three liquids, and then mechanically stirred to achieve uniform mixing, with good mixing effect and high efficiency.

[0025] 9. The airflow sprayed from the first nozzle and the second nozzle pushes the mixed liquid, driving the mixed liquid to be mixed more fully, thereby improving the mixing efficiency. The synergistic effect of ventilation and stirring can improve the stirring effect and make the mixed liquid more uniform and delicate.

[0026] 10. Liquid and air intake share a set of conveying structures, which reduces space occupation and has an ingenious design.

[0027] 11. When spraying liquid, the droplets can cover a higher area, increase the vertical coverage of the droplets, and make the sprayed droplets more uniform and delicate, improving the collision and mixing effect. When spraying, the inclined gas outlet can form a more complex and intense flow pattern of gas in the liquid. When the gas is sprayed at an inclined angle, it will push the liquid to move in the inclined direction, and at the same time will produce certain radial and tangential components, which are conducive to the mixing and uniform distribution of the liquid.

[0028] 12. The setting of the baffle changes the flow direction of the mixed liquid in the tank. When the mixed liquid encounters the baffle during the stirring process, it is forced to change the original flow path, thereby reducing the occurrence of circular motion (i.e. "swirling").

[0029] 13. The setting of the horizontal plate is not only used to fix the first cylinder, but also plays the same anti-spinning role as the baffle.

[0030] 14. By setting the first stirring plate and the second stirring plate, it can be ensured that the mixed liquid is subjected to shear force and impact force from different directions during the stirring process, so as to achieve more complete mixing of the mixed liquid. The first stirring plate and the second stirring plate distributed up and down can cover a larger space in the tank body, ensuring that the mixed liquid can be effectively stirred at all positions in the tank body.

[0031] 15. The second spiral blade is combined with the second cylinder to achieve the effect of stirring and pushing the mixed liquid, which is more conducive to the circulation of the upper and lower layers of the mixed liquid in coordination with the pushing of the first spiral blade.

[0032] 16. Through structural design, when the first stirring plate rotates, it drives the second stirring plates on the left and right sides to rotate synchronously in the opposite direction, and drives the first spiral blade and the second spiral blade to rotate so that the mixed liquid circulates in the tank body and is evenly mixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a system block diagram of the present invention.

[0034] Figure 2 It is a schematic diagram of the main structure of the mixing tank of the present invention.

[0035] Figure 3 It is a schematic diagram of the structure of the interior of the tank body of the present invention.

[0036] Figure 4 It is a schematic cross-sectional structural diagram of the first cylinder of the present invention.

[0037] Figure 5 It is a schematic diagram of the internal structure of the sealing box of the present invention.

[0038] The markings in the accompanying drawings are: 100-resin adsorption device, 200-membrane concentration device, 300-electrolytic cell, 400-mixing tank, 500-immersed ultrafiltration membrane tank, 600-electrodialysis equipment, 700-reverse osmosis equipment, 800-bipolar membrane electrodialysis equipment, 1-tank body, 2-liquid collection component, 3-stirring component, 4-first cylinder, 41-chamber, 42-first spray hole, 21-liquid collection box, 22-partition, 23-first pipeline, 24-second pipeline, 25-first valve, 26-boosting pump, 27-Venturi tube, 28-collection Liquid chamber, 5-second valve, 6-third valve, 7-first air inlet pipe, 8-second air inlet pipe, 31-motor, 32-transmission assembly, 33-first bearing seat, 34-hollow shaft, 35-L-type stirring frame, 36-first stirring plate, 37-second spray hole, 38-first spiral blade, 9-transverse plate, 10-sealing box, 11-second bearing seat, 12-first bevel gear, 13-third bearing seat, 14-second bevel gear, 15-rotating shaft, 16-second stirring plate, 17-second spiral blade, 18-second cylinder, 19-baffle. DETAILED DESCRIPTION

[0039] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0040] Contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0041] like Figures 1 to 5 As shown, the electroplating wastewater recovery system provided in this embodiment includes a resin adsorption device 100, a membrane concentration device 200, an electrolytic cell 300, a mixing tank 400, an immersed ultrafiltration membrane pool 500, an electrodialysis device 600, a reverse osmosis device 700, and a bipolar membrane electrodialysis device 800. The eluate outlet of the resin adsorption device 100 is connected to the membrane concentration device 200, the concentrated liquid outlet of the membrane concentration device 200 is connected to the electrolytic cell 300, the dialysate outlet of the resin adsorption device 100, the permeate outlet of the membrane concentration device 200, and the residual liquid outlet of the electrolytic cell 300 are all connected to the mixing tank 400, the water outlet of the mixing tank 400 is connected to the immersed ultrafiltration membrane pool 500, the filtrate outlet of the immersed ultrafiltration membrane pool 500 is connected to the electrodialysis device 600, and the desalinated liquid outlet of the electrodialysis device 600 is connected to the reverse osmosis device 700. The concentrated liquid outlet of the electrodialysis device 600 is connected with the bipolar membrane electrodialysis device 800, and the alkali liquid outlet of the bipolar membrane electrodialysis device 800 is connected with the immersed ultrafiltration membrane pool 500. The mixing tank 400 includes a tank body 1, a liquid collecting component 2, a stirring component 3, and a first cylinder body 4. The liquid collecting component 2 and the stirring component 3 are fixed on the top of the tank body 1, and the first cylinder body 4 is fixed inside the tank body 1. The stirring component 3 has a first spiral blade 38, and the first spiral blade 38 passes through the first cylinder body 4. The first cylinder body 4 has a chamber 41 inside. The inner wall of the first cylinder body 4 has a plurality of first spray holes 42, and the first spray holes 42 are connected with the chamber 41. The stirring component 3 has a second spray hole 37, and the second spray hole 37 is located in the first cylinder body 4. The liquid collecting component 2 has two outlets, one of which is connected with the chamber 41, and the other outlet is connected with the second spray hole 37.

[0042] This embodiment also provides a method for recycling electroplating wastewater, which uses the above-mentioned electroplating wastewater recycling system for recycling, and includes the following steps:

[0043] The electroplating wastewater is sent to the resin adsorption device 100 for resin adsorption treatment, and the eluate obtained by the treatment is sent to the membrane concentration device 200 for membrane concentration treatment. The concentrated solution obtained by the treatment is sent to the electrolytic cell 300 for electrolysis treatment to obtain valuable metals. The dialysate obtained by the resin adsorption treatment, the permeate obtained by the membrane concentration treatment, and the residual liquid obtained by the electrolysis treatment are sent to the liquid collection component 2 of the mixing tank 400 for collection. The dialysate obtained by the resin adsorption treatment, the permeate obtained by the membrane concentration treatment, and the residual liquid obtained by the electrolysis treatment are collected by the liquid collection component 2. The residual liquid obtained by the decomposition treatment is sent to the tank body 1 and is stirred and mixed by the stirring component 3. The mixed liquid after the mixing treatment is sent to the submerged ultrafiltration membrane pool 500 for ultrafiltration treatment. The filtrate obtained by the ultrafiltration treatment is sent to the electrodialysis equipment 600 for electrodialysis treatment. The desalinated liquid obtained by the treatment is sent to the reverse osmosis equipment 700 for reverse osmosis treatment to obtain produced water. The concentrated liquid obtained by the treatment is sent to the bipolar membrane electrodialysis equipment 800 for electrodialysis treatment again to obtain acid solution and alkali solution, and the alkali solution is recycled to the submerged ultrafiltration membrane pool 500.

[0044] In this way, electroplating wastewater is recycled and treated to obtain not only valuable metals, but also acid and alkali, and the produced water meets the discharge standards. By treating the liquids in each step, zero pollution discharge is achieved. The dialysate obtained by resin adsorption treatment, the permeate obtained by membrane concentration treatment, and the residual liquid obtained by electrolysis treatment are mixed in a mixing tank 400 and then sent to the submerged ultrafiltration membrane pool 500, so that the water quality of the mixed liquid is more uniform and stable, providing more favorable water quality conditions for subsequent treatment steps. During mixing, the dialysate obtained by resin adsorption treatment and the residual liquid obtained by electrolysis treatment are transported to the stirring component 3 through the liquid collection component 2, and are rotated and sprayed through the second spray hole 37. At the same time, the permeate obtained by membrane concentration treatment is sent to the chamber 41 and sprayed through the first spray hole 42. The droplets sprayed by the second spray hole 37 and the droplets sprayed by the first spray hole 42 collide and mix, and then fall to the bottom of the tank body 1. In this way, before stirring, the collision mixing method is used for preliminary mixing, which greatly improves the mixing efficiency. On this basis, combined with the arrangement of the first cylinder 4 and the first spiral blade 38, the upper and lower layers are circulated, thereby achieving a uniform mixing effect. During the rotation process, the first spiral blade 38 not only promotes the flow of the mixed liquid, but also cuts and flips the mixed liquid, so that the mixed liquid is more fully mixed during the stirring process.

[0045] The liquid collecting assembly 2 includes a liquid collecting box 21, a partition 22, a first pipe 23, a second pipe 24, a first valve 25, a pressure pump 26, and a venturi tube 27. Two partitions 22 are fixed inside the liquid collecting box 21. The two partitions 22 divide the internal space of the liquid collecting box 21 into three liquid collecting chambers 28. The tops of the three liquid collecting chambers 28 are respectively connected to the dialysate outlet of the resin adsorption device 100, the permeate outlet of the membrane concentration device 200, and the residual liquid outlet of the electrolytic cell 300. The bottom end of each liquid collecting chamber 28 is fixedly connected to the first pipe 23. The first pipe 23 is provided A first valve 25 is provided, the liquid outlet end of the first pipe 23 of the leftmost liquid collecting chamber 28 is connected to the liquid inlet end of the venturi tube 27, the liquid outlet end of the first pipe 23 of the middle liquid collecting chamber 28 is connected to the throat of the venturi tube 27, the liquid outlet end of the venturi tube 27 is connected to the second spray hole 37 through the second pipe 24, the liquid outlet end of the first pipe 23 of the rightmost liquid collecting chamber 28 is connected to the chamber 41, and the first pipe 23 of the leftmost liquid collecting chamber 28, the first pipe 23 of the rightmost liquid collecting chamber 28, and the second pipe 24 are all provided with a booster pump 26. The three liquid collecting chambers 28 store the dialysate obtained by resin adsorption treatment, the residual liquid obtained by electrolysis treatment, and the permeate obtained by membrane concentration treatment in sequence from left to right. The three liquid collecting chambers 28 are integrated into a liquid collecting box 21 to reduce space occupation. The three first pipes 23 and the first valve 25 are arranged to control the delivery of the dialysate obtained by resin adsorption treatment, the permeate obtained by membrane concentration treatment, and the residual liquid obtained by electrolysis treatment respectively, so as to meet different operation requirements. The liquid is pressurized by the pressure pump 26, which is conducive to the subsequent liquid spraying, collision and dispersion. The dialysate obtained by resin adsorption treatment is sent to the venturi tube 27 through the first pipe 23 after being pressurized. When the dialysate obtained by resin adsorption treatment passes through the throat of the venturi tube 27, the flow rate increases, the pressure decreases, and a negative pressure zone is formed, and the residual liquid obtained by electrolysis treatment is sucked, so that the residual liquid obtained by electrolysis treatment and the dialysate obtained by resin adsorption treatment are mixed with each other during the transportation process to form a uniform mixed liquid. In this process, the fluid generates a strong shear force and turbulence effect, thereby realizing effective mixing between different fluids. The mixed mixed liquid is sent to the stirring assembly 3 through the second pipe 24 after being pressurized, and finally sprayed out through the second spray hole 37. The permeate obtained by the membrane concentration treatment after pressurization is sent to the chamber 41 through the first pipe 23, and finally sprayed out through the first spray hole 42. The residual liquid obtained by electrolysis treatment and the dialysate obtained by resin adsorption treatment are initially mixed to form a mixed liquid, which is then sprayed and collided with the permeate obtained by membrane concentration treatment through the first spray hole 42 and the second spray hole 37 respectively to perform initial mixing of the three liquids, and then mechanically stirred to achieve uniform mixing, with good mixing effect and high efficiency.

[0046] The mixing tank 400 further includes a second valve 5, a third valve 6, a first air inlet pipe 7, and a second air inlet pipe 8. The first pipe 23 of the rightmost liquid collecting chamber 28 is fixedly connected to the first air inlet pipe 7, the first air inlet pipe 7 is provided with a second valve 5, the first air inlet pipe is located below the booster pump 26, and the first air inlet pipe 7 is connected to an external air source. The second pipe 24 is fixedly connected to the second air inlet pipe 8, the second air inlet pipe 8 is provided with a second valve 5, the second air inlet pipe is located below the booster pump 26, and the second air inlet pipe 8 is connected to an external air source. When the liquid is transported, the first valve 25 and the booster pump 26 are closed. The second valve 5 and the third valve 6 are opened as required. After the second valve 5 is opened, the airflow enters the chamber 41 through the first air inlet pipe 7 and is ejected through the first spray hole 42. After the third valve 6 is opened, the airflow enters the stirring assembly 3 through the second air inlet pipe 8 and is ejected through the second spray hole 37. Combined with the rotation of the stirring assembly 3, the airflow is ejected in the form of a rotating jet. The airflow ejected from the first spray hole 42 and the second spray hole 37 pushes the mixed liquid, driving the mixed liquid to mix more fully, thereby improving the mixing efficiency. The synergistic effect of ventilation and stirring can improve the stirring effect, making the mixed liquid more uniform and delicate. The liquid inlet and the air inlet share a set of conveying structures, reducing space occupation, and the design is ingenious.

[0047] Among them, the chamber 41 is an annular cavity, and the plurality of first spray holes 42 include a plurality of spray hole groups spaced apart along the circumference of the chamber 41, and each spray hole group includes a plurality of first spray holes 42 spaced apart along the height direction of the first cylinder 4, and the first spray holes 42 are arranged to be tilted upward. When spraying liquid, the droplets can cover a higher area, increasing the vertical coverage of the droplets, and making the sprayed droplets more uniform and delicate, thereby improving the collision and mixing effect. When spraying, the inclined gas outlet can form a more complex and intense flow pattern of the gas in the liquid. When the gas is sprayed at an inclined angle, it will push the liquid to move in the inclined direction, and at the same time will produce certain radial and tangential components, which are conducive to the mixing and uniform distribution of the liquid.

[0048] The stirring assembly 3 further includes a motor 31, a transmission assembly 32, a first bearing seat 33, a hollow shaft 34, an L-shaped stirring frame 35, and a first stirring plate 36. The motor 31 and the first bearing seat 33 are fixed to the top of the tank body 1. The hollow shaft 34 passes through the first bearing seat 33, the top wall of the tank body 1, and the first cylinder 4, and is fixed with an L-shaped stirring frame 35. A plurality of first stirring plates 36 are fixed to the outside of the L-shaped stirring frame 35. The motor 31 is connected to the hollow shaft 34 through the transmission assembly 32. The bottom end of the second pipe 24 extends into the hollow shaft 34. The hollow shaft 34 has a plurality of second spray holes 37 spaced apart along its length. The motor 31 rotates, and the transmission assembly 32 drives the hollow shaft 34 to rotate, so that the spiral blades rotate, pushing the mixed liquid while stirring the mixed liquid. At the same time, the L-shaped stirring frame 35 and the first stirring plate 36 are driven to rotate for stirring.

[0049] A plurality of baffles 19 are fixed to the inner wall of the tank body 1 and are spaced apart from each other. A plurality of first stirring plates 36 are spaced apart from each other and are staggered with the baffles 19. The baffles 19 are arranged to change the flow direction of the mixed liquid in the tank body 1. When the mixed liquid encounters the baffles 19 during stirring, it is forced to change the original flow path, thereby reducing the occurrence of circular motion (i.e., "swirling").

[0050] The first cylinder 4 is fixed in the tank 1 by a transverse plate 9. The transverse plate 9 is not only used to fix the first cylinder 4, but also plays the same anti-spinning role as the baffle.

[0051] The mixing tank 400 further includes a sealed box 10, a second bearing seat 11, a first bevel gear 12, a third bearing seat 13, a second bevel gear 14, a rotating shaft 15, and a second stirring plate 16. The sealed box 10 is fixed to the inner bottom wall of the tank body 1. The second bearing seat 11 is fixed to the inner bottom wall of the sealed box 10. The bottom end of the hollow shaft 34 passes through the top wall of the sealed box 10 and is inserted into the second bearing seat 11. The first bevel gear 12 is fixed to the lower part of the hollow shaft 34. The first bevel gear 12 is located in the sealed box 10. The mandrel 34 is sealed with the sealed box 10. The third bearing seat 13 is fixed to the left and right side walls of the sealed box 10. The inner end of the rotating shaft 15 passes through the side wall of the sealed box 10 and extends to the sealed box 10 to fix the second bevel gear 14. The first bevel gear 12 is meshed with the second bevel gear 14. The rotating shaft 15 is sealed with the sealed box 10. The outer end of the rotating shaft 15 is fixed with the second stirring plate 16. The second stirring plate 16 is located below the first stirring plate 36 and is perpendicular to the first stirring plate 36. The hollow shaft 34 rotates, driving the first bevel gear 12 to rotate, so that the second bevel gear 14 rotates, driving the rotating shaft 15 to rotate, so that the second stirring plate 16 rotates, and cooperates with the first stirring plate 36 to ensure that the mixed liquid is subjected to shear force and impact force from different directions during the stirring process, so as to more fully achieve the mixing of the mixed liquid. The first stirring plate 36 and the second stirring plate 16 distributed up and down can cover a larger space in the tank body 1, ensuring that the mixed liquid can be effectively stirred at all positions in the tank body 1.

[0052] Among them, the mixing tank 400 also includes a second spiral blade 17 and a second cylinder 18. The second cylinder 18 is fixed on both sides of the inner bottom wall of the tank body 1. The second cylinder 18 is located between the sealing box 10 and the second stirring plate 16. The second spiral blade 17 is fixed to the rotating shaft 15 and passes through the second cylinder 18. The rotating shaft 15 rotates, driving the second spiral blade 17 to rotate. Combined with the setting of the second cylinder 18, the effect of stirring and pushing the mixed liquid is achieved. The push of the first spiral blade 38 is more conducive to the circulation of the upper and lower layers of the mixed liquid. Through structural design, when the first stirring plate 36 rotates, it drives the second stirring plates 16 on the left and right sides to rotate synchronously in the opposite direction, and drives the first spiral blade 38 and the second spiral blade 17 to rotate so that the mixed liquid circulates in the tank body 1 for uniform mixing.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Electroplating wastewater recovery system, characterized by: Including resin adsorption devices, membrane concentration devices, electrolytic cells, mixing tanks, immersed ultrafiltration membrane cells, electrodialysis equipment, reverse osmosis equipment, and bipolar membrane electrodialysis equipment; The eluent outlet of the resin adsorption device is connected to the membrane concentration device; The concentrated liquid outlet of the membrane concentration device is connected to the electrolytic cell; The dialysate outlet of the resin adsorption device, the permeate outlet of the membrane concentration device, and the residual liquid outlet of the electrolytic cell are all connected to the mixing tank; The water outlet of the mixing tank is connected to the submerged ultrafiltration membrane pool, the filtrate outlet of the submerged ultrafiltration membrane pool is connected to the electrodialysis device, the desalinated liquid outlet of the electrodialysis device is connected to the reverse osmosis device, and the concentrated liquid outlet of the electrodialysis device is connected to the bipolar membrane electrodialysis device; The alkaline solution outlet of the bipolar membrane electrodialysis device is connected to the submerged ultrafiltration membrane pool; The mixing tank comprises a tank body, a liquid collecting component, a stirring component, and a first cylinder; A liquid collecting component and a stirring component are fixed on the top of the tank body; A first cylinder is fixed inside the tank; The stirring assembly has a first spiral blade, and the first spiral blade passes through the first cylinder; The first cylinder has a chamber inside, and the inner wall of the first cylinder has a plurality of first spray holes, and the first spray holes are connected to the chamber; The stirring assembly has a second spray hole, and the second spray hole is located in the first cylinder; The liquid collecting component has two outlets, one of which is communicated with the chamber, and the other is communicated with the second spray hole.

2. The electroplating wastewater recovery system according to claim 1, characterized in that: The liquid collecting assembly includes a liquid collecting box, a partition, a first pipeline, a second pipeline, a first valve, a pressure pump, and a venturi tube; Two partitions are fixed inside the liquid collecting box, and the two partitions divide the internal space of the liquid collecting box into three liquid collecting chambers, and the tops of the three liquid collecting chambers are respectively connected to the dialysate outlet of the resin adsorption device, the permeate outlet of the membrane concentration device, and the residual liquid outlet of the electrolytic cell; The bottom end of each of the liquid collecting chambers is fixedly connected to a first pipeline, and the first pipeline is provided with a first valve; The liquid outlet end of the first pipe of the leftmost liquid collecting chamber is connected to the liquid inlet end of the venturi tube, the liquid outlet end of the first pipe of the middle liquid collecting chamber is connected to the throat of the venturi tube, the liquid outlet end of the venturi tube is connected to the second spray hole through the second pipe, and the liquid outlet end of the first pipe of the rightmost liquid collecting chamber is connected to the chamber; The first pipeline of the liquid collecting chamber located on the far left, the first pipeline of the liquid collecting chamber located on the far right, and the second pipeline are all provided with a pressure pump.

3. The electroplating wastewater recovery system according to claim 2, characterized in that: The mixing tank also includes a second valve, a third valve, a first air inlet pipe, and a second air inlet pipe; The first pipeline of the rightmost liquid collecting chamber is fixedly connected with a first air inlet pipe, the first air inlet pipe is provided with a second valve, the first air inlet pipe is located below the booster pump, and the first air inlet pipe is connected with an external air source; The second pipeline is fixedly connected with a second air inlet pipe, the second air inlet pipe is provided with a second valve, the second air inlet pipe is located below the booster pump, and the second air inlet pipe is connected with an external air source.

4. The electroplating wastewater recovery system according to claim 2, characterized in that: The chamber is an annular chamber; The plurality of first spray holes include a plurality of spray hole groups spaced apart and distributed along the circumference of the chamber; Each group of spray holes includes a plurality of first spray holes spaced apart and distributed along the height direction of the first cylinder; The first spray hole is arranged to be inclined upward.

5. The electroplating wastewater recovery system according to claim 2, characterized in that: The stirring assembly also includes a motor, a transmission assembly, a first bearing seat, a hollow shaft, an L-shaped stirring frame, and a first stirring plate; A motor and a first bearing seat are fixed on the top of the tank; The hollow shaft passes through the first bearing seat, the top wall of the tank body, and the first cylinder body, and is fixed with an L-shaped stirring frame, and a plurality of first stirring plates are fixed on the outer side of the L-shaped stirring frame; The motor is connected to the hollow shaft through a transmission assembly; The bottom end of the second pipe extends into the hollow shaft; The hollow shaft is provided with a plurality of the second spray holes spaced apart along the length direction thereof.

6. The electroplating wastewater recovery system according to claim 5, characterized in that: The inner side wall of the tank body is fixed with a plurality of baffles spaced apart vertically; A plurality of the first stirring plates are distributed vertically at intervals and are staggered with the baffle.

7. The electroplating wastewater recovery system according to claim 1, characterized in that: The first cylinder is fixed in the tank body through a transverse plate.

8. The electroplating wastewater recovery system according to claim 1, characterized in that: The mixing tank also includes a sealing box, a second bearing seat, a first bevel gear, a third bearing seat, a second bevel gear, a rotating shaft, and a second stirring plate; A sealing box is fixed to the bottom wall of the tank body; A second bearing seat is fixed to the bottom wall of the sealing box, the bottom end of the hollow shaft passes through the top wall of the sealing box and is inserted into the second bearing seat, a first bevel gear is fixed to the lower part of the hollow shaft, the first bevel gear is located in the sealing box, and a seal is arranged between the hollow shaft and the sealing box; The left and right side walls of the sealed box are both fixed with third bearing seats, the inner end of the rotating shaft passes through the side wall of the sealed box and extends to the sealed box where a second bevel gear is fixed, the first bevel gear is meshed with the second bevel gear, a seal is set between the rotating shaft and the sealed box, and a second stirring plate is fixed to the outer end of the rotating shaft; The second stirring plate is located below the first stirring plate and is perpendicular to the first stirring plate.

9. The electroplating wastewater recovery system according to claim 8, characterized in that: The mixing tank also includes a second spiral blade and a second cylinder; A second cylinder is fixed on both the left and right sides of the bottom wall of the tank body, and the second cylinder is located between the sealing box and the second stirring plate; The second spiral blade is fixed to the rotating shaft and passes through the second cylinder.

10. A method for recycling electroplating wastewater, characterized in that: The electroplating wastewater recovery system according to any one of claims 1 to 9 is used for recovery, comprising the following steps: The electroplating wastewater is sent to a resin adsorption device for resin adsorption treatment, the eluate obtained by the treatment is sent to a membrane concentration device for membrane concentration treatment, and the concentrated solution obtained by the treatment is sent to an electrolytic cell for electrolysis treatment to obtain valuable metals; The dialysate obtained by resin adsorption treatment, the permeate obtained by membrane concentration treatment, and the residual liquid obtained by electrolysis treatment are sent to the liquid collection component of the mixing tank for collection, and the dialysate obtained by resin adsorption treatment, the permeate obtained by membrane concentration treatment, and the residual liquid obtained by electrolysis treatment are sent into the tank body through the liquid collection component, and stirred and mixed by the stirring component; The mixed liquid after the mixing treatment is sent to an immersed ultrafiltration membrane pool for ultrafiltration treatment, the filtrate obtained by the ultrafiltration treatment is sent to an electrodialysis device for electrodialysis treatment, the desalinated liquid obtained by the treatment is sent to a reverse osmosis device for reverse osmosis treatment to obtain produced water, and the concentrated liquid obtained by the treatment is sent to a bipolar membrane electrodialysis device for electrodialysis treatment again to obtain acid solution and alkali solution; The alkali solution is recycled to the submerged ultrafiltration membrane pool.

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