Ring type bipolar membrane electrodialysis recovery device

Abstract

The utility model discloses a ring type bipolar membrane electrodialysis recovery device which comprises a shell, a first power supply, a second power supply, a raw water pipeline and a circulating mixing device, the shell is provided with an anode annular ring, a magnetic bipolar annular membrane, an anion exchange annular membrane, a cation exchange annular membrane and a cathode bar. The anode of the first power supply is connected with the anode annular ring, and the cathode of the first power supply is connected with the cathode bar. Two poles of the second power supply are respectively connected with the magnetic bipolar annular membrane, so that cations ionized by the magnetic bipolar annular membrane move into the sulfuric acid concentration area, and anions ionized by the magnetic bipolar annular membrane move into the alkali production mixing area. The device can be used for separating ferrophosphorus synthesis washing water into H2SO4, reclaimed water, Ni (OH) 2 and Fe (OH) 3 softening solutions, and additional agents do not need to be added to supplement anions. The separation and purification of the acidic heavy metal solution-ferrophosphorus synthesis washing water are realized by utilizing a ring type electrodialysis structure, and the treatment effect of the device and the concentrated water softening anti-scaling effect are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater recovery, in particular to a ring-type bipolar membrane electrodialysis recovery device. Background Art

[0002] In the process of manufacturing lithium iron phosphate batteries, a filter press is used to separate the iron phosphate solids and slurry, and the iron phosphate filter residue is washed with pure water, thereby producing a large amount of Ni 2+ , Fe 3+ Acidic wastewater. At present, acidic wastewater is usually treated by adding alkali for neutralization and coagulation and sedimentation, or by pretreatment + resin + membrane filtration for multi-stage treatment. The problems with the above wastewater treatment methods are: the former consumes a large amount of reagents and produces a large amount of solid waste, and the latter is expensive and has a complicated treatment process, making it difficult to treat efficiently. In addition, conventional electrodialysis devices are formed by extrusion of multiple membranes, and multiple combinations need to be repeated to separate fresh and concentrated water, and are prone to scaling. Conventional bipolar membrane electrodialysis treatment requires additional reagents to balance metal ions, and continuous electrodialysis treatment consumes a large amount of reagents. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the utility model proposes a ring-type bipolar membrane electrodialysis recovery device.

[0004] The utility model provides a ring-type bipolar membrane electrodialysis recovery device, the ring-type bipolar membrane electrodialysis recovery device comprising:

[0005] A shell, wherein the inner cavity of the shell is provided with an anode annular ring, a magnetic bipolar annular membrane, an anion exchange annular membrane, a cation exchange annular membrane and a cathode rod in sequence from the outside to the inside; the area between the anode annular ring and the magnetic bipolar annular membrane is an alkali production mixing area, the area between the magnetic bipolar annular membrane and the anion exchange annular membrane is a sulfuric acid concentration area, the area between the anion exchange annular membrane and the cation exchange annular membrane is a fresh water area, and the area between the cation exchange annular membrane and the cathode rod is an acid production mixing area; anions located in the fresh water area can enter the sulfuric acid concentration area through the anion exchange annular membrane, and cations located in the fresh water area can enter the acid production mixing area through the cation exchange annular membrane;

[0006] A first power source, wherein the positive electrode of the first power source is connected to the anode annular ring, and the negative electrode of the first power source is connected to the cathode rod;

[0007] A second power supply, wherein the two poles of the second power supply are respectively connected to the magnetic bipolar annular membrane, so that the magnetic bipolar annular membrane ionizes cations to the sulfuric acid concentration area and ionizes anions to the alkali production mixing area;

[0008] A raw water pipeline, connected to the fresh water area;

[0009] The circulating mixing device is used to extract and mix the liquids in the alkali-producing mixing zone and the acid-producing mixing zone, and then transport them to the alkali-producing mixing zone and the acid-producing mixing zone respectively.

[0010] According to some embodiments of the utility model, the annular bipolar membrane electrodialysis recovery device further includes a first circulation device, and a water inlet end and a water outlet end of the first circulation device are respectively connected to the fresh water area.

[0011] According to some embodiments of the utility model, the first circulation device includes a first water outlet pipe, a fresh water circulation box, a first water inlet pipe and a first water pump, the two ends of the first water outlet pipe are respectively connected to the fresh water circulation box and the fresh water area, the two ends of the first water inlet pipe are respectively connected to the fresh water circulation box and the fresh water area, and the first water pump is arranged on the first water inlet pipe.

[0012] According to some embodiments of the present utility model, the water outlet end of the raw water pipeline is connected to the first water inlet pipe.

[0013] According to some embodiments of the utility model, the annular bipolar membrane electrodialysis recovery device further includes a second circulation device, and a water inlet end and a water outlet end of the second circulation device are respectively connected to the sulfuric acid concentration zone.

[0014] According to some embodiments of the utility model, the second circulation device includes a second water outlet pipe, a sulfuric acid circulation box, a second water inlet pipe and a second water pump, the two ends of the second water outlet pipe are respectively connected to the sulfuric acid circulation box and the sulfuric acid concentration area, the two ends of the second water inlet pipe are respectively connected to the sulfuric acid circulation box and the sulfuric acid concentration area, and the second water pump is arranged on the second water inlet pipe.

[0015] According to some embodiments of the utility model, the annular bipolar membrane electrodialysis recovery device also includes a circulating mixing device, the water inlet end of the circulating mixing device is respectively connected to the alkali producing mixing zone and the acid producing mixing zone, and the water outlet end of the circulating mixing device is respectively connected to the alkali producing mixing zone and the acid producing mixing zone.

[0016] According to some embodiments of the utility model, the circulating mixing device includes a third water outlet pipe, a concentrated water circulation box, a third water inlet pipe, a third water pump, a first pipeline and a second pipeline, the first pipeline and the second pipeline are respectively connected to the alkali producing mixing zone and the acid producing mixing zone, the two ends of the third water outlet pipe are respectively connected to the concentrated water circulation box and the first pipeline, the two ends of the third water inlet pipe are respectively connected to the concentrated water circulation box and the second pipeline, and the third water pump is arranged on the third water inlet pipe.

[0017] According to some embodiments of the present invention, the magnetic bipolar annular membrane comprises, from outside to inside, an anion exchange layer, a magnetized intermediate layer and a cation exchange layer.

[0018] According to some embodiments of the utility model, magnetic flux lines (630) are arranged in the magnetized intermediate layer (610), and the two poles of the second power source (250) are respectively connected to the two ends of the magnetic flux lines (630).

[0019] According to the annular bipolar membrane electrodialysis recovery device of the embodiment of the utility model, at least the following technical effects are achieved: raw water enters the fresh water area through the raw water pipeline, and when the first power supply and the second power supply are powered on, under the action of the electric field, cations in the fresh water area enter the acid-producing mixed area through the cation exchange annular membrane, and anions enter the sulfuric acid concentration area through the annular anion exchange membrane; water in the magnetic bipolar annular membrane is dissociated, anions enter the alkali-producing mixed area, and cations enter the sulfuric acid concentration area; the first pipeline mixes the solution between the acid-producing mixed area and the alkali-producing mixed area to produce a neutralization reaction; the annular anode annular ring, magnetic bipolar annular membrane, anion exchange annular membrane, and cation exchange annular membrane can improve space utilization, thereby improving the separation efficiency of the solution. The annular electrodialysis structure is used to achieve separation and purification of raw water, and improve the treatment effect of the device and the softening effect of concentrated water.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 It is a schematic structural diagram of a ring-type bipolar membrane electrodialysis recovery device of some embodiments of the utility model;

[0023] Figure 2 is a top view of a ring-type bipolar membrane electrodialysis recovery device according to some embodiments of the utility model;

[0024] Figure 3It is a schematic diagram of the structure of the magnetic bipolar annular membrane of some embodiments of the utility model;

[0025] Figure 4 It is a schematic diagram of the structure of magnetic flux lines of some embodiments of the utility model.

[0026] Figure Number:

[0027] Shell 100, anode annular ring 110, magnetic bipolar annular membrane 120, anion exchange annular membrane 130, cation exchange annular membrane 140, cathode rod 150;

[0028] Alkali production mixing area 200, sulfuric acid concentration area 210, fresh water area 220, acid production mixing area 230, first power supply 240, second power supply 250, raw water pipeline 260, first pipeline 270;

[0029] A first circulation device 300, a first water outlet pipe 310, a fresh water circulation box 320, a first water inlet pipe 330, a first water pump 340, a first discharge pipe 350, and a first valve 360;

[0030] A second circulation device 400, a second water outlet pipe 410, a sulfuric acid circulation box 420, a second water inlet pipe 430, a second water pump 440, a second discharge pipe 450, and a second valve 460;

[0031] Circulation mixing device 500, third water outlet pipe 510, concentrated water circulation box 520, third water inlet pipe 530, third water pump 540, second pipeline 550, third discharge pipe 560, third valve 570;

[0032] Anion exchange layer 600 , magnetized intermediate layer 610 , cation exchange layer 620 , and magnetic flux lines 630 . DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are 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 a limitation on the present invention.

[0035] In the description of the utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0036] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0037] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings.

[0038] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 The annular bipolar membrane electrodialysis recovery device includes a housing 100, a first power source 240, a second power source 250, a raw water pipeline 260 and a circulating mixing device 500. The inner cavity of the housing 100 is sequentially provided with an anode annular ring 110, a magnetic bipolar annular membrane 120, an anion exchange annular membrane 130, a cation exchange annular membrane 140 and a cathode rod 150 from the outside to the inside. Among them, the anode annular ring 110, the magnetic bipolar annular membrane 120, the anion exchange annular membrane 130 and the cation exchange annular membrane 140 are all annular and concentrically arranged. The annular region between the inner side of the anode annular ring 110 and the outer side of the magnetic bipolar annular membrane 120 is the alkali-producing mixed region 200, the annular region between the inner side of the magnetic bipolar annular membrane 120 and the outer side of the anion exchange annular membrane 130 is the sulfuric acid concentration region 210, the annular region between the inner side of the anion exchange annular membrane 130 and the outer side of the cation exchange annular membrane 140 is the fresh water region 220, and the annular region between the inner side of the cation exchange annular membrane 140 and the outer peripheral wall of the cathode rod 150 is the acid-producing mixed region 230. Anions located in the fresh water region 220 can enter the sulfuric acid concentration region 210 through the anion exchange annular membrane 130, and cations located in the fresh water region 220 can enter the acid-producing mixed region 230 through the cation exchange annular membrane 140; the positive electrode of the first power supply 240 is connected to the anode annular ring 110, and the negative electrode of the first power supply 240 is connected to the cathode rod 150. The two poles of the second power supply 250 are respectively connected to the magnetic bipolar annular membrane 120, so that the cations ionized by the magnetic bipolar annular membrane 120 move to the sulfuric acid concentration area 210, and the anions ionized move to the alkali production mixing area 200. The raw water pipeline 260 is connected to the fresh water area 220. The circulation mixing device 500 is respectively connected to the alkali production mixing area 200 and the acid production mixing area 230. The circulation mixing device 500 is used to extract and mix the liquids in the alkali production mixing area 200 and the acid production mixing area 230, and then transport the mixed liquids to the alkali production mixing area 200 and the acid production mixing area 230 respectively.

[0039] When the ferrophosphorus synthetic washing water enters the fresh water area 220 through the raw water pipeline 260, when the first power source 240 and the second power source 250 are powered on, the H in the fresh water area 220 is energized by the electric field. + 、Ni 2+ , Fe 3+ Through the cation exchange annular membrane 140 into the acid-generating mixing zone 230, SO4 2- The fresh water in the fresh water area 220 is used as reclaimed water. The water in the magnetic bipolar annular membrane 120 is dissociated, and OH - Entering the alkali production mixing area 200, H + Entering the sulfuric acid concentration area 210; in the sulfuric acid concentration area 210, SO4 2- With H + H2SO4 is formed; the circulating mixing device 500 mixes the solution between the acid-producing mixing zone 230 and the alkali-producing mixing zone 200 to produce a neutralization reaction, producing Ni(OH)2 and Fe(OH)3 softened solutions, and uses the magnetic field generated by the magnetic bipolar annular membrane 120 to soften the crystals, prevent scaling on the membrane surface, and achieve the separation of phosphorus-iron synthetic wash water into H2SO4, reclaimed water, Ni(OH)2 and Fe(OH)3 softened solutions, without adding additional agents to supplement anions. Moreover, the annular anode annular ring 110, magnetic bipolar annular membrane 120, anion exchange annular membrane 130 and cation exchange annular membrane 140 can improve space utilization, thereby improving the separation efficiency of the solution. The ring-type electrodialysis structure is used to achieve the separation and purification of the acidic heavy metal solution-phosphorus-iron synthetic wash water, improving the treatment effect of the device and the softening effect of concentrated water.

[0040] Preferably, refer to Figure 1 and Figure 2 The annular bipolar membrane electrodialysis recovery device further includes a first circulation device 300, and the water inlet and outlet of the first circulation device 300 are respectively connected to the fresh water area 220. The first circulation device 300 includes a first outlet pipe 310, a fresh water circulation box 320, a first inlet pipe 330 and a first water pump 340. The two ends of the first outlet pipe 310 are respectively connected to the fresh water circulation box 320 and the fresh water area 220, the two ends of the first inlet pipe 330 are respectively connected to the fresh water circulation box 320 and the fresh water area 220, and the first water pump 340 is arranged on the first inlet pipe 330. The liquid in the fresh water area 220 enters the fresh water circulation box 320 through the first outlet pipe 310, and then the liquid in the fresh water circulation box 320 is returned to the fresh water area 220 through the first inlet pipe 330 by the first water pump 340. The liquid under the circulating flow can promote the ion dialysis movement.

[0041] Further, see Figure 1The outlet end of the raw water pipe 260 is connected to the first water inlet pipe 330, and the ferrophosphorus synthetic washing water enters the first water inlet pipe 330 through the raw water pipe 260, and is then transported to the fresh water area 220 by a water pump. The valve of the raw water pipe 260 is closed, and the ferrophosphorus synthetic washing water circulates under the action of the first circulation device 300.

[0042] Preferably, refer to Figure 1 and Figure 2 The annular bipolar membrane electrodialysis recovery device also includes a second circulation device 400, and the water inlet and outlet of the second circulation device 400 are respectively connected to the sulfuric acid concentration zone 210. The second circulation device 400 includes a second outlet pipe 410, a sulfuric acid circulation box 420, a second inlet pipe 430, and a second water pump 440. The two ends of the second outlet pipe 410 are respectively connected to the sulfuric acid circulation box 420 and the sulfuric acid concentration zone 210, and the two ends of the second inlet pipe 430 are respectively connected to the sulfuric acid circulation box 420 and the sulfuric acid concentration zone 210. The second water pump 440 is arranged on the second inlet pipe 430. The liquid in the sulfuric acid concentration zone 210 enters the sulfuric acid circulation box 420 through the second outlet pipe 410, and then the liquid in the sulfuric acid circulation box 420 is returned to the sulfuric acid concentration zone 210 through the second inlet pipe 430 by the second water pump 440, which can promote SO4 2- With H + The reaction forms H2SO4.

[0043] Preferably, refer to Figure 1 and Figure 2 The water inlet end of the circulating mixing device 500 is respectively connected to the alkali-producing mixing zone 200 and the acid-producing mixing zone 230, and the water outlet end of the circulating mixing device 500 is respectively connected to the alkali-producing mixing zone 200 and the acid-producing mixing zone 230. The circulating mixing device 500 includes a third water outlet pipe 510, a concentrated water circulation box 520, a third water inlet pipe 530, a third water pump 540, a first pipeline 270 and a second pipeline 550. The first pipeline 270 is respectively connected to the alkali-producing mixing zone 200 and the acid-producing mixing zone 230, and the second pipeline 550 is respectively connected to the alkali-producing mixing zone 200 and the acid-producing mixing zone 230. Both ends of the third water outlet pipe 510 are respectively connected to the concentrated water circulation box 520 and the first pipeline 270, and both ends of the third water inlet pipe 530 are respectively connected to the concentrated water circulation box 520 and the second pipeline 550. The third water pump 540 is arranged on the third water inlet pipe 530.

[0044] It can be understood that the liquid in the alkali-producing mixed zone 200 and the liquid in the acid-producing mixed zone 230 are both mixed through the first pipeline 270 and then through the third water inlet pipe 530 into the concentrated water circulation box 520. The mixed solution enters the second pipeline 550 through the third water inlet pipe 530 under the action of the third water pump 540, and is divided in the second pipeline 550 and enters the alkali-producing mixed zone 200 and the acid-producing mixed zone 230 respectively, thereby realizing H in the electrodialysis device. + With OH - Ion neutralization can achieve ion balance in the electrodialysis device without adding reagents to supplement anions and cations.

[0045] Preferably, refer to Figure 3 The magnetic bipolar annular membrane 120 includes an anion exchange layer 600, a magnetized intermediate layer 610 and a cation exchange layer 620 from the outside to the inside. A magnetic flux line 630 is arranged in the magnetized intermediate layer 610, and the two poles of the second power supply 250 are respectively connected to the two ends of the magnetic flux line 630. When the second power supply 250 is powered on, the water in the magnetized intermediate layer 610 is dissociated under the action of the electric field, and OH - Entering the alkali-producing mixed zone 200 through the anion exchange layer 600, H + The magnetic flux lines 630 provide a magnetic field, which can improve the electrolysis of water molecules, reduce the power consumption of water electrolysis, and promote the Ni 2+ , Fe 3+ It is easier to penetrate the cation exchange annular membrane 140 and soften Ni(OH)2 and Fe(OH)3, preventing crystals from contaminating the plates and membranes after deposition, thereby improving the electrodialysis operation effect.

[0046] Further, see Figure 4 , the magnetic flux lines 630 are in the magnetized intermediate layer 610, and the magnetic flux lines 630 spirally rise through the multi-layer coil to form a magnetic flux line 630 circle, and are connected to the second power supply 250 to form a closed energized coil. After the concentrated water flows through the circulating mixing device 500 for external circulation, the water molecules are activated under the action of the magnetic field to reduce Ni 2+ with Fe 3+ The metal reduction adsorption scaling reaction in the cathode rod 150 and the activated water molecules wrapping to reduce the ability of Ni(OH)2 and Fe(OH)3 crystals become stronger, resulting in a decrease in the probability of crystal collision adsorption becoming larger, achieving a softening function in the alkali production mixing area 200, and ultimately achieving the neutralization and concentration functions of acid and alkali concentrated water.

[0047] Preferably, refer to Figure 1One end of the first discharge pipe 350 is connected to the first water inlet pipe 330. The connection between the first discharge pipe 350 and the first water inlet pipe 330 is located on the side of the first water pump 340 away from the fresh water circulation tank 320. The first water inlet pipe 330 is provided with a first valve 360. By closing the valve of the raw water pipeline 260, closing the first valve 360, and opening the valve of the first discharge pipe 350, the first water pump 340 can pump the liquid in the fresh water circulation tank 320 and the fresh water area 220 to the first discharge pipe 350 and then discharge it.

[0048] Preferably, refer to Figure 1 One end of the second discharge pipe 450 is connected to the second water inlet pipe 430. The connection between the second discharge pipe 450 and the second water inlet pipe 430 is located on the side of the pipeline of the second water pump 440 away from the sulfuric acid circulation box 420. The second water inlet pipe 430 is provided with a second valve 460. By closing the second valve 460 and opening the valve of the second discharge pipe 450, the second water pump 440 can pump the liquid from the sulfuric acid circulation box 420 and the sulfuric acid concentration area 210 to the second discharge pipe 450 and then discharge it.

[0049] Preferably, refer to Figure 1 One end of the third discharge pipe 560 is connected to the third water inlet pipe 530. The connection between the third discharge pipe 560 and the third water inlet pipe 530 is located on the side of the pipeline of the third water pump 540 away from the concentrated water circulation box 520. The third valve 570 is provided on the third water inlet pipe 530. By closing the third valve 570 and opening the valve of the third discharge pipe 560, the third water pump 540 can pump the liquid in the concentrated water circulation box 520, the alkali production mixing zone 200 and the acid production mixing zone 230 to the third discharge pipe 560 and then discharge it.

[0050] In the description of this specification, the description with reference to the term "some embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0051] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A ring-type bipolar membrane electrodialysis recovery device, characterized in that: include: The shell (100) has an inner cavity which is provided with an anode annular ring (110), a magnetic bipolar annular membrane (120), an anion exchange annular membrane (130), a cation exchange annular membrane (140) and a cathode rod (150) in sequence from the outside to the inside; the area between the anode annular ring (110) and the magnetic bipolar annular membrane (120) is an alkali production mixing area (200), the area between the magnetic bipolar annular membrane (120) and the anion exchange annular membrane (130) is a sulfuric acid concentration area (210), and the anion exchange annular membrane (130) is a sulfuric acid concentration area (210). The area between the annular exchange membrane (130) and the cation exchange annular membrane (140) is a freshwater area (220), and the area between the cation exchange annular membrane (140) and the cathode rod (150) is an acid-generating mixed area (230); anions in the freshwater area (220) can enter the sulfuric acid concentration area (210) through the anion exchange annular membrane (130), and cations in the freshwater area (220) can enter the acid-generating mixed area (230) through the cation exchange annular membrane (140); A first power source (240), wherein a positive electrode of the first power source (240) is connected to the anode annular ring (110), and a negative electrode of the first power source (240) is connected to the cathode rod (150); A second power source (250), wherein two poles of the second power source (250) are respectively connected to the magnetic bipolar annular membrane (120), so that the magnetic bipolar annular membrane (120) ionizes cations to the sulfuric acid concentration area (210) and ionizes anions to the alkali production mixing area (200); A raw water pipeline (260) is connected to the fresh water area (220); The circulating mixing device (500) is used to extract and mix the liquids in the alkali-producing mixing zone (200) and the acid-producing mixing zone (230), and then transport them to the alkali-producing mixing zone (200) and the acid-producing mixing zone (230) respectively.

2. The annular bipolar membrane electrodialysis recovery device according to claim 1, characterized in that: The annular bipolar membrane electrodialysis recovery device further comprises a first circulation device (300), wherein a water inlet end and a water outlet end of the first circulation device (300) are respectively connected to the fresh water area (220).

3. The annular bipolar membrane electrodialysis recovery device according to claim 2, characterized in that: The first circulation device (300) comprises a first water outlet pipe (310), a fresh water circulation box (320), a first water inlet pipe (330) and a first water pump (340); two ends of the first water outlet pipe (310) are respectively connected to the fresh water circulation box (320) and the fresh water area (220); two ends of the first water inlet pipe (330) are respectively connected to the fresh water circulation box (320) and the fresh water area (220); and the first water pump (340) is arranged on the first water inlet pipe (330).

4. The annular bipolar membrane electrodialysis recovery device according to claim 3, characterized in that: The water outlet end of the raw water pipeline (260) is connected to the first water inlet pipe (330).

5. The annular bipolar membrane electrodialysis recovery device according to claim 1, characterized in that: The annular bipolar membrane electrodialysis recovery device further comprises a second circulation device (400), wherein a water inlet and a water outlet of the second circulation device (400) are respectively connected to the sulfuric acid concentration zone (210).

6. The ring-type bipolar membrane electrodialysis recovery device according to claim 5, characterized in that: The second circulation device (400) comprises a second water outlet pipe (410), a sulfuric acid circulation box (420), a second water inlet pipe (430) and a second water pump (440), wherein the two ends of the second water outlet pipe (410) are respectively connected to the sulfuric acid circulation box (420) and the sulfuric acid concentration zone (210), the two ends of the second water inlet pipe (430) are respectively connected to the sulfuric acid circulation box (420) and the sulfuric acid concentration zone (210), and the second water pump (440) is arranged on the second water inlet pipe (430).

7. The ring-type bipolar membrane electrodialysis recovery device according to claim 1, characterized in that: The water inlet end of the circulating mixing device (500) is respectively connected to the alkali-producing mixing zone (200) and the acid-producing mixing zone (230), and the water outlet end of the circulating mixing device (500) is respectively connected to the alkali-producing mixing zone (200) and the acid-producing mixing zone (230).

8. The ring-type bipolar membrane electrodialysis recovery device according to claim 7, characterized in that: The circulating mixing device (500) comprises a third water outlet pipe (510), a concentrated water circulation box (520), a third water inlet pipe (530), a third water pump (540), a first pipeline (270) and a second pipeline (550). The first pipeline (270) and the second pipeline (550) are respectively connected to the alkali production mixing zone (200) and the acid production mixing zone (230). The two ends of the third water outlet pipe (510) are respectively connected to the concentrated water circulation box (520) and the first pipeline (270). The two ends of the third water inlet pipe (530) are respectively connected to the concentrated water circulation box (520) and the second pipeline (550). The third water pump (540) is arranged on the third water inlet pipe (530).

9. The ring-type bipolar membrane electrodialysis recovery device according to claim 1, characterized in that: The magnetic bipolar annular membrane (120) comprises, from the outside to the inside, an anion exchange layer (600), a magnetized intermediate layer (610) and a cation exchange layer (620).

10. The ring-type bipolar membrane electrodialysis recovery device according to claim 9, characterized in that: Magnetic flux lines (630) are arranged in the magnetized intermediate layer (610), and the two poles of the second power source (250) are respectively connected to the two ends of the magnetic flux lines (630).

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