Wastewater treatment device and process for recycling lithium iron phosphate batteries

Abstract

The present invention relates to the technical field of lithium iron phosphate battery recycling, and specifically to a wastewater treatment device and process for recycling lithium iron phosphate batteries, comprising a pump, a water inlet, a shell, an ultrafiltration membrane, a partition, a water outlet, a sedimentation mechanism and a countercurrent mechanism; the pump is installed on one side of the shell, and the water inlet and the water outlet are connected through the ultrafiltration membrane; the ultrafiltration membrane is evenly segmented by the partition; the countercurrent mechanism is installed on the side wall of the ultrafiltration membrane, and a gap is set with the side wall of the ultrafiltration membrane; the sedimentation mechanism is installed on the side wall of the countercurrent mechanism; the present invention provides a sedimentation mechanism and a countercurrent mechanism that rotate synchronously with a hydraulic rod, so that the problem of metal particles adhering to and scaling on the surface of the ultrafiltration membrane during the sedimentation process is reduced, and at the same time, through the repeatedly moving sedimentation mechanism, the magnetic pole is combined with the centrifuge to achieve the self-separation effect of the metal particles in the membrane treatment process, thereby improving the service life of the ultrafiltration membrane and further improving the effect of the pretreatment process.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium iron phosphate battery recycling, and in particular to a wastewater treatment device and process for recycling lithium iron phosphate batteries. Background Art

[0002] Lithium iron phosphate batteries are currently widely used in fields such as electric vehicles and energy storage systems, primarily due to their long lifespan and high safety. Because these batteries can withstand thousands of charge and discharge cycles, providing a reliable energy storage solution, they are suitable for applications requiring long lifespan and high safety. Furthermore, lithium iron phosphate batteries do not contain harmful heavy metals such as nickel and cobalt, resulting in a relatively small negative impact on the environment. However, a problem associated with their widespread use is the recycling and disposal of discarded batteries.

[0003] Recycling materials from discarded lithium iron phosphate batteries is a very important step, as the lithium, iron, phosphorus and other materials therein can be reused, thereby reducing resource waste. Currently, the more common methods for treating iron phosphate wastewater are the ammonium method and the sodium method. However, during the treatment process of these two methods, due to the relatively small solubility of magnesium hydroxide in the pretreatment process, it is difficult for the magnesium hydroxide material to precipitate, ultimately resulting in poor pretreatment effect. In addition, during the use of ultrafiltration membranes, the membranes are easily scaled by calcium, magnesium, iron and manganese ions, resulting in serious membrane pollution and a greatly reduced service life.

[0004] In order to solve these problems and thus improve the effect of recycling lithium iron phosphate battery wastewater, the present invention provides a wastewater treatment device and process for recycling lithium iron phosphate batteries to solve the problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that: since the solubility of magnesium hydroxide materials is relatively low in the pretreatment process, it is difficult for them to form precipitation during the treatment process, which ultimately leads to poor effect of the pretreatment process. In addition, during the use of the ultrafiltration membrane after precipitation, the presence of calcium, magnesium, iron and manganese ions that are prone to scaling will cause serious contamination of the membrane, thereby significantly shortening the service life of the membrane.

[0006] In order to solve the technical problem, the technical solution adopted by the present invention is: to provide a wastewater treatment device for recycling lithium iron phosphate batteries, including a pump, a water inlet, a shell, an ultrafiltration membrane, a partition, a water outlet, a sedimentation mechanism and a countercurrent mechanism; the pump is installed on one side of the shell, and the water inlet and the water outlet are connected through the ultrafiltration membrane; the ultrafiltration membrane is evenly segmented by the partition; the countercurrent mechanism is installed on the side wall of the ultrafiltration membrane, and a gap is set with the side wall of the ultrafiltration membrane, so that the water flow passing through the ultrafiltration membrane impacts the hydraulic rod, causing the hydraulic rod to rotate and change the magnetic pole position; the sedimentation mechanism is installed on the side wall of the countercurrent mechanism, and the direction of the magnetic force is changed by the rotation of the hydraulic rod, so that the rotating rod rotates, and then the sedimentation mechanism is limited by the smaller acute angle end of the triangular structure of the limit block, and the angle of the limit block is changed by the inclination slope of the closed-loop groove, driving the dirt collection ring to rotate under the limit of the bidirectional groove.

[0007] The countercurrent mechanism includes a rotating rod, a bidirectional groove, an arc-shaped leaf, a drag reduction bearing and a hydraulic rod; the rotating rod is rotatably connected between adjacent partitions, the ultrafiltration membrane is coaxial with the rotating rod and fixedly connected between adjacent partitions, and a gap is provided between the rotating rod and the ultrafiltration membrane, and the rotating rod side wall has multiple overflow ports in a circular array; the side wall of the rotating rod is provided with a bidirectional groove for providing sliding of a limit slider, and the arc-shaped leaf is fixedly connected to both ends of the rotating rod; the drag reduction bearing is fixedly connected to both ends of the rotating rod, and the hydraulic rod is placed coaxially with the rotating rod; the hydraulic rod is arranged in a spiral shape, and both ends are arranged in a conical shape, and at the same time, both ends can be clamped with the drag reduction bearing.

[0008] The countercurrent mechanism is connected to the pump at one end, thereby providing a continuous suction force, so that the metal ions and impurities outside the ultrafiltration membrane are isolated outside the ultrafiltration membrane, and the water molecules will penetrate the ultrafiltration membrane, thereby determining the direction of water flow in the ultrafiltration membrane. Due to the existence of the hydraulic rod, the hydraulic rod begins to rotate and move against the direction of water flow under the impact of the water flow; at the same time, considering the contact problem between the external water body and the ultrafiltration membrane, a plurality of overflow ports are arranged on the side wall of the rotating rod, thereby providing sufficient contact between the water body to be filtered and the ultrafiltration membrane; in addition, since the hydraulic rod will rotate and move under the impact of the water flow, until the hydraulic rod slides to the water outlet, since there is a gap between the hydraulic rod and the ultrafiltration membrane, and the connection is set to be conical, the hydraulic rod will not block the water inlet of the ultrafiltration membrane, and at the same time, the hydraulic rod will fit with the drag reduction bearing, thereby providing conditions for self-rotation.

[0009] Similarly, the arc-shaped leaves arranged at both ends of the rotating rod are mainly used to provide an auxiliary precipitation effect during the pretreatment and filtration process, thereby reducing the more obvious direct contact between the metal particles and the ultrafiltration membrane. The reason for this is mainly due to the adsorption of the pump, which causes the water to enter the ultrafiltration membrane due to the pressure difference during filtration. Under the influence of the pressure difference, the metal particles will also enter the side wall of the ultrafiltration membrane. Since they cannot pass through, the metal particles will be scaled. Therefore, the arc-shaped leaves are provided to provide a reverse rotation, thereby balancing the force on the metal particles to reduce the probability of adhesion.

[0010] The interior of the hydraulic rod is fixedly connected with a magnetic pole, and the side walls at both ends of the rotating rod are staggered with different magnetic poles; the two ends of the bidirectional groove are closed-loop grooves, and the closed-loop grooves are provided with an inclined slope to guide the limit rotating block, wherein a cross-fork groove is provided between the two closed-loop grooves, and the closed-loop grooves at both ends are connected.

[0011] The hydraulic rod rotates in the ultrafiltration membrane due to the impact of the water flow, and the hydraulic rod will continue to rotate with the action of the pump. Since the magnetic poles are set at both ends of the hydraulic rod, and the magnetic poles are N and S respectively, the two magnetic poles occupy 180° of the space respectively, thereby forming the bottom surface of the cone. The magnetic poles of the hydraulic rod are set at the central axis. Correspondingly, since the side wall of the ultrafiltration membrane is provided with a rotating rod, the two ends of the rotating rod are correspondingly provided with N and S levels. When the hydraulic rod moves to the two ends of the rotating rod and starts to rotate, the magnetic poles of the rotating rod and the magnetic poles of the hydraulic rod produce the phenomenon of like repulsion and opposite attraction, and the magnetic poles are continuously rotating, thereby causing the rotating rod to be driven to rotate.

[0012] The sedimentation mechanism includes a limit rotating block, a cylindrical shaft and a dirt collecting ring; the limit rotating block is arranged to be a triangular structure, and the whole is provided with a bending arc that fits the bidirectional groove; the upper end of the limit rotating block is fixedly connected to a ring-shaped opening that is rotatably connected to the cylindrical shaft; the inner wall of the dirt collecting ring is fixedly connected to the cylindrical shaft, wherein the rotation angle of the cylindrical shaft is the same as the smallest acute angle of the limit rotating block.

[0013] The limit rotating block is configured as a triangle, so that it can slide in the bidirectional groove. The bidirectional groove is configured as a cross. From the unfolded plane, the two ends of the bidirectional groove are closed-loop annular grooves, so that the annular groove provides space for the limit rotating block to rotate. When the limit rotating block rotates, it passes through the crossed fork-shaped grooves. Each section of the crossed fork-shaped grooves rotates in a single direction, and the conversion between the two directions is achieved through the closed-loop grooves. So the limit rotating block moves around the rotating rod under the action of the rotational force provided by the rotating rod.

[0014] Similarly, in order to avoid the rotation angle of the limit turn block being set to be too large, so that the dirt collecting ring will be stuck in the bidirectional groove, the rotation angle of the cylindrical shaft is the same as the smallest acute angle of the limit turn block, so as to meet the conditions for the cylindrical shaft to provide the rotation of the limit turn block, and at the same time it will not be stuck by the bidirectional groove of the side wall of the rotating column.

[0015] The dirt collecting ring is arranged in a ring shape, and an inclined sedimentation port is provided on the side wall of the dirt collecting ring. The inclination direction of the sedimentation port is the same as the rotation direction of the hydraulic rod when the pump is working, and the sedimentation port is connected to the interior of the dirt collecting ring; a paddle wheel rotates coaxially inside the dirt collecting ring, and a partition net is fixedly connected to the side wall of the paddle wheel; sedimentation tanks are provided between the sedimentation ports, and a plurality of the sedimentation tanks are arranged in a ring array around the dirt collecting ring and are evenly distributed between the inclined ports.

[0016] The partition screen separates the sedimentation port connection area and the paddle wheel area into two areas, and when the rotating rod rotates, the limit rotating block is synchronized with the dirt collecting ring through the cylindrical shaft, thereby driving the dirt collecting ring to rotate. Since the partition screen separates the sedimentation port connection area and the paddle wheel area into two areas, during the filtration of the ultrafiltration membrane, some metal particles that are not centrifugally thrown out by the arc-shaped leaves enter the dirt collecting ring, and the dirt collecting ring further isolates the metal particles outside. At the same time, due to the rotation of the dirt collecting ring, part of the water enters the dirt collecting ring through the sedimentation port, so that after the metal particles enter, the metal will be thrown out due to centrifugation because of the different metals they contain, and then adhere to the sedimentation tank, concentrating the metal particles in the sedimentation tank, reducing the possibility of attachment to the surface of the ultrafiltration membrane, thereby improving the service life. At the same time, after use, the metal particles can be thrown out by backflushing, and the hydraulic rod moves in the opposite direction, and the overall rotation and working mode are changed, thereby achieving cleaning.

[0017] A wastewater treatment process for recycling lithium iron phosphate batteries comprises the following steps:

[0018] S1: The wastewater from lithium iron phosphate batteries is collected centrally through a pipeline system and then transferred to a high-efficiency sedimentation tank for a reagent reaction to promote metal precipitation. The reagent concentration is in the range of 1-5%, so that a large amount of metal precipitates are generated in the sedimentation tank;

[0019] S2: The supernatant enters the ceramic membrane from the sedimentation tank, where the ceramic membrane produces water with a SS value of ≤1ppm. At this time, the pump is started to separate the water in the sedimentation tank into solids and liquids. At this time, the metal particles are first collected by the rotating sedimentation mechanism and enter the sedimentation tank. The water that passes through is then separated into solids and liquids through the penetration hole.

[0020] S3: Through the spiral rotation of the hydraulic rod and the magnetic field providing the force for the rotation of the rotating rod, the dirt collecting ring moves repeatedly on the side wall of the rotating rod, thereby realizing the repeated collection of sediment;

[0021] S4: Manganese sand and chelating resin are then added to the sedimentation tank to deeply remove unreacted iron, manganese, calcium, and magnesium ions in the solution. Finally, the TDS is concentrated to 150,000 mg / L through a reverse osmosis membrane or an ion exchange membrane and then fed into an MVR for evaporation to obtain salt. The pressure range of this process is set at 150-250 psi. Hot water is then used to heat the wastewater to reduce viscosity and improve separation efficiency. The hot water temperature is set between 50-70 degrees Celsius and then cooled through a cooling system to promote the sedimentation of the iron phosphate solid phase.

[0022] S5: The wastewater after hot water heat exchange is passed through the ultrafiltration membrane to intercept the remaining solid phase again, and the conductivity of the recycled water is reduced to below 10us / cm through the acid-resistant RO membrane process.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. The present invention sets a sedimentation mechanism and a countercurrent mechanism that rotate synchronously with the hydraulic rod, so that the problem of metal particles adhering to and scaling the surface of the ultrafiltration membrane during the sedimentation process is reduced. At the same time, the magnetic pole is combined with the centrifuge through the repeatedly moving sedimentation mechanism to achieve the self-separation effect of metal particles in the membrane treatment process, thereby increasing the service life of the ultrafiltration membrane and further improving the effect of the pretreatment process.

[0025] 2. The present invention connects the rotating rod between adjacent partitions and fixes it on the partition coaxially with the ultrafiltration membrane. This not only ensures the stability of the rotating rod, but also leaves a gap between the rotating rod and the ultrafiltration membrane to accommodate the overflow port, so as to ensure more complete contact with the wastewater, reduce the direct contact between metal particles and the ultrafiltration membrane, thereby reducing the risk of scaling and providing convenience for later maintenance.

[0026] 3. The present invention isolates some metal particles that are not thrown out by the arc-shaped blades inside by arranging paddle wheels and partitions. With the action of centrifugal force, the metal particles are thrown out and attached to the sedimentation tank, and the metal particles are concentrated in the sedimentation tank, which significantly reduces the possibility of metal particles adhering to the surface of the ultrafiltration membrane, thereby extending the service life of the ultrafiltration membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] The above and other aspects of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0029] Figure 1 It is an overall schematic diagram of the present invention;

[0030] Figure 2 is a cross-sectional view of the rotating rod of the present invention;

[0031] Figure 3 A schematic diagram of the side wall of the rotating rod of the present invention;

[0032] Figure 4 This is a schematic diagram of the connection of the limit slider of the present invention;

[0033] Figure 5 It is a schematic structural diagram of the limit slider of the present invention;

[0034] Figure 6 This is a schematic diagram of the fouling ring of the present invention;

[0035] Figure 7 Schematic diagram of the internal structure of the impeller of the present invention;

[0036] Figure 8 It is a cross-sectional view of the fouling ring of the present invention;

[0037] Figure 9 A schematic diagram of the arrangement of magnetic poles inside the rotating rod of the present invention;

[0038] Figure 10 This is a plan view of the connection between the pump and the ultrafiltration membrane of the present invention;

[0039] Figure 11 The figure is a flow chart of the ammonium ferric phosphate recovery process of the present invention.

[0040] In the figure: 1. Pump; 2. Water outlet; 3. Housing; 4. Ultrafiltration membrane; 5. Countercurrent mechanism; 51. Rotating rod; 511. Overflow port; 52. Bidirectional groove; 521. Closed-loop groove; 522. Fork-shaped groove; 53. Arc blade; 54. Drag reduction bearing; 55. Hydraulic rod; 551. Magnetic pole; 6. Sedimentation mechanism; 61. Limiting block; 62. Cylindrical shaft; 63. Scaling ring; 631. Sedimentation port; 632. Paddle wheel; 633. Partition screen; 634. Sedimentation tank; 64. Annular port; 7. Partition; 8. Penetration hole; 9. Water inlet. DETAILED DESCRIPTION

[0041] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0042] like Figures 1 to 11As shown, a wastewater treatment device for recycling lithium iron phosphate batteries includes a pump 1, a water inlet 9, a housing 3, an ultrafiltration membrane 4, a partition 7, a water outlet 2, a penetration hole 8, a sedimentation mechanism 6 and a countercurrent mechanism 5; the pump 1 is installed on one side of the housing 3, and the water inlet 9 and the water outlet 2 are connected through the ultrafiltration membrane 4; the ultrafiltration membrane 4 is evenly segmented by the partition 7, and the adjacent partitions 7 are connected through the penetration hole 8; the countercurrent mechanism 5 is installed on the side wall of the ultrafiltration membrane 4, and a gap is set between the side wall of the ultrafiltration membrane 4. Then the water flow passing through the ultrafiltration membrane 4 impacts the hydraulic rod 55, causing the hydraulic rod 55 to rotate and change the position of the magnetic pole 551; the sedimentation mechanism 6 is installed on the side wall of the countercurrent mechanism 5, and the direction of the magnetic force is changed by the rotation of the hydraulic rod 55, so that the rotating rod 51 rotates, and then the sedimentation mechanism 6 is limited by the acute angle end with a smaller degree in the triangular structure of the limiting rotating block 61, and the angle of the limiting rotating block 61 is changed by the inclination slope of the closed-loop groove 521, driving the dirt collecting ring 63 to rotate under the limit of the bidirectional groove 52.

[0043] Such as 1 and Figure 10 As shown, the pump 1 is installed on one side of the housing 3, and serves to draw wastewater into the system from the water inlet 9 and discharge it after treatment. The core part of this system is the ultrafiltration membrane 4, which is divided into several uniform segments to ensure an efficient filtration and purification process. In addition, the counterflow mechanism 5 is located on the side wall of the ultrafiltration membrane 4, and an appropriate gap is left between it and the membrane, allowing the position of the magnetic pole 551 to be adjusted by the impact of the water flow of the hydraulic rod 55, further improving the efficiency and maintainability of the system; the sedimentation mechanism 6 is installed on the side wall of the counterflow mechanism 5, and through the triangular structure of the limit switch 61, it ensures that impurities and dirt in the wastewater can be smoothly precipitated in a small angle limit manner. These impurities are then concentrated and rotated under the action of the two-way groove 52, thereby easily separating and further purifying the treated water.

[0044] like Figure 2 and Figure 3 As shown, the countercurrent mechanism 5 includes a rotating rod 51, a two-way groove 52, an arc-shaped leaf 53, a drag reduction bearing 54 and a hydraulic rod 55; the rotating rod 51 is rotatably connected between adjacent partitions 7, the ultrafiltration membrane 4 is coaxial with the rotating rod 51 and fixedly connected between adjacent partitions 7, and a gap is provided between the rotating rod 51 and the ultrafiltration membrane 4, and the side wall of the rotating rod 51 is provided with a plurality of overflow ports 511 in an annular array; the side wall of the rotating rod 51 is provided with a two-way groove 52 for providing sliding of a limit slider, and the arc-shaped leaf 53 is fixedly connected to both ends of the rotating rod 51; the drag reduction bearing 54 is fixedly connected to both ends of the rotating rod 51, and the hydraulic rod 55 is placed coaxially with the rotating rod 51; the hydraulic rod 55 is set to be spiral, and the two ends are set to be conical, and at the same time, the two ends can be clamped with the drag reduction bearing 54.

[0045] Since one end of the countercurrent mechanism 5 is connected to the pump 1, it provides a continuous suction force, so that the metal ions and impurities outside the ultrafiltration membrane 4 are isolated outside the ultrafiltration membrane 4, and the water molecules will penetrate the ultrafiltration membrane 4, thereby determining the direction of the water flow in the ultrafiltration membrane 4. Due to the presence of the hydraulic rod 55, the hydraulic rod 55 begins to rotate and move against the direction of the water flow under the impact of the water flow; at the same time, considering the contact problem between the external water body and the ultrafiltration membrane 4, a plurality of overflow ports 511 are provided on the side wall of the rotating rod 51, thereby providing sufficient contact between the water body to be filtered and the ultrafiltration membrane 4; in addition, since the hydraulic rod 55 will rotate and move under the impact of the water flow, until the hydraulic rod 55 slides to the water outlet 2, since there is a gap between the hydraulic rod 55 and the ultrafiltration membrane 4, and the connection is set to be conical, the hydraulic rod 55 will not block the water inlet of the ultrafiltration membrane 4, and at the same time, the hydraulic rod 55 will fit with the drag reduction bearing 54, thereby providing conditions for self-rotation.

[0046] Similarly, the arc-shaped leaves 53 provided at both ends of the rotating rod 51 are mainly intended to provide an auxiliary precipitation effect during the pretreatment and filtration process, thereby reducing the more obvious direct contact between the metal particles and the ultrafiltration membrane 4. The reason for this is mainly due to the adsorption of the pump 1, which causes the water to enter the ultrafiltration membrane 4 due to the pressure difference during filtration. Under the influence of the pressure difference, the metal particles will also enter the side wall of the ultrafiltration membrane 4. Since they cannot pass through, the metal particles will be scaled. Therefore, the arc-shaped leaves 53 are provided to provide a reverse rotation, thereby balancing the force on the metal particles to reduce the probability of adhesion.

[0047] The countercurrent mechanism 5 includes a rotating rod 51, a two-way groove 52, an arc-shaped leaf 53, a drag-reducing bearing 54 and a hydraulic rod 55 to achieve efficient treatment of wastewater. The rotating rod 51 is connected between adjacent partitions 7, and is coaxial with the ultrafiltration membrane 4 and fixed on the partition 7. This not only ensures the stability of the rotating rod 51, but also leaves a gap between the rotating rod 51 and the ultrafiltration membrane 4 to accommodate the overflow port 511 for more complete contact with the wastewater. In addition, the arc-shaped leaf 53 is fixed at both ends of the rotating rod 51, which plays a role in reducing the direct contact between metal particles and the ultrafiltration membrane 4, thereby reducing the risk of scaling.

[0048] In addition, the hydraulic rod 55 of the countercurrent mechanism 5 is a key component. It is placed coaxially with the rotating rod 51, is spiral-shaped, and has two ends configured to be tapered so that it can be engaged with the drag-reducing bearing 54. This design plays a key role in treating wastewater. One end of the countercurrent mechanism 5 is connected to the pump 1 to provide continuous suction to separate the metal ions and impurities outside the ultrafiltration membrane 4, while allowing water molecules to pass through the ultrafiltration membrane 4. The hydraulic rod 55 begins to rotate under the impact of the water flow and moves against the direction of the water flow, ensuring that the hydraulic rod 55 completes the rotation without blocking the water inlet 9 of the ultrafiltration membrane 4.

[0049] The interior of the hydraulic rod 55 is fixedly connected with a magnetic pole 551, and the side walls at both ends of the rotating rod 51 are staggered with different magnetic poles 551; the two ends of the bidirectional groove 52 are closed-loop grooves 521, and the closed-loop grooves 521 are provided with an inclined slope to guide the limit rotating block 61, wherein a cross-fork groove 522 is provided between the two closed-loop grooves 521, and the closed-loop grooves 521 at both ends are connected.

[0050] The hydraulic rod 55 rotates in the ultrafiltration membrane 4 due to the impact of the water flow, and the hydraulic rod 55 will continue to rotate with the action of the pump 1. Since the magnetic poles 551 are arranged at both ends of the hydraulic rod 55, and the magnetic poles 551 are respectively N-level and S-level, the two magnetic poles 551 respectively occupy 180° of the space, thereby forming the bottom surface of the cone. The magnetic poles 551 of the hydraulic rod 55 are arranged at the central axis. Correspondingly, since the side wall of the ultrafiltration membrane 4 is provided with a rotating rod 51, the two ends of the rotating rod 51 are correspondingly provided with N and S levels. When the hydraulic rod 55 moves to the two ends of the rotating rod 51 and starts to rotate, the magnetic poles 551 of the rotating rod 51 and the magnetic poles 551 of the hydraulic rod 55 produce the phenomenon of like repulsion and opposite attraction, and the magnetic poles 551 are continuously rotating, thereby causing the rotating rod 51 to be driven to rotate.

[0051] Magnetic poles 551 are fixed inside the hydraulic rod 55, while different magnetic poles 551 are alternately arranged on the sidewalls at both ends of the rotating rod 51. A cross-shaped groove 522 is also arranged between the two closed-loop grooves 521, forming a complex and efficient magnetic field structure. This combines physical phenomena with mechanical principles, providing a unique driving force for wastewater treatment. Specifically, the hydraulic rod 55 begins to rotate within the ultrafiltration membrane 4 under the impact of the wastewater, causing the hydraulic rod 55 to rotate continuously, while the action of the pump 1 also keeps it rotating. The hydraulic rod 55 is provided with N- and S-level magnetic poles 551 at each end, respectively, each occupying 180 degrees of space and forming a conical base. Correspondingly, the rotating rod 51 is provided on the sidewalls of the ultrafiltration membrane 4, with its ends corresponding to the N- and S-level magnetic poles 551, respectively. When the hydraulic rod 55 moves to both ends of the rotating rod 51 and starts to rotate, the magnetic poles 551 of the rotating rod 51 and the magnetic poles 551 of the hydraulic rod 55 have an interaction of like repulsion and opposite attraction, which drives the rotation of the rotating rod 51.

[0052] like Figure 4 and Figure 5 As shown, the sedimentation mechanism 6 includes a limit turn block 61, a cylindrical shaft 62 and a dirt collecting ring 63; the limit turn block 61 is set to a triangular structure, and the whole is provided with a bending arc that fits the bidirectional groove 52; the upper end of the limit turn block 61 is fixedly connected to a ring mouth 64 that is rotatably connected to the cylindrical shaft 62; the inner wall of the dirt collecting ring 63 is fixedly connected to the cylindrical shaft 62, wherein the rotation angle of the cylindrical shaft 62 is the same as the smallest acute angle of the limit turn block 61.

[0053] like Figure 5 As shown, the limit rotating block 61 is set to be triangular, so that it can slide in the two-way groove 52. The two-way groove 52 is set to be cross-shaped. From the unfolded plane, the two ends of the two-way groove 52 are closed-loop annular grooves, and the annular grooves provide space for the limit rotating block 61 to rotate. When the limit rotating block 61 rotates, it passes through the crossed fork-shaped grooves 522. Each section of the crossed fork-shaped grooves 522 rotates in a single direction, and the conversion between two directions is realized through the closed-loop grooves 521. Then, the limit rotating block 61 moves around the rotating rod under the action of the rotational force provided by the rotating rod.

[0054] Similarly, in order to prevent the rotation angle of the limit turn block 61 from being too large, so that the dirt collecting ring 63 will be stuck in the bidirectional groove 52, the rotation angle of the cylindrical shaft 62 is the same as the smallest acute angle of the limit turn block 61, so that the cylindrical shaft 62 can provide the conditions for the limit turn block 61 to rotate, and at the same time it will not be stuck in the bidirectional groove 52 of the side wall of the rotating column.

[0055] The limiting rotating block 61 adopts a triangular structure design, with an overall curvature that matches the bidirectional groove 52. At the same time, its upper end is connected to the cylindrical shaft 62, allowing the limiting rotating block 61 to rotate on the cylindrical shaft 62, ensuring that the limiting rotating block 61 can move freely in the sedimentation mechanism 6. On the other hand, the bidirectional groove 52 is arranged in a cross shape, with closed-loop annular grooves at both ends, providing space for the limiting rotating block 61 to rotate. Through this structure, the limiting rotating block 61 can slide in a single direction within the intersecting fork-shaped grooves 522 while rotating, and then switch directions through the closed-loop grooves 521, allowing it to move around the cylindrical shaft 62.

[0056] In addition, in order to avoid the rotation angle of the limit turn block 61 being set to be too large, so that the dirt collecting ring 63 will be stuck in the bidirectional groove 52, the rotation angle of the cylindrical shaft 62 is set to be the same as the smallest acute angle of the limit turn block 61, ensuring that the cylindrical shaft 62 can provide rotation conditions for the limit turn block 61 and will not be stuck by the side wall of the bidirectional groove 52.

[0057] like Figure 6 As shown, the dirt collecting ring 63 is arranged in a ring shape, and the side wall of the dirt collecting ring 63 is provided with an inclined sedimentation port 631, the inclination direction of the sedimentation port 631 is the same as the rotation direction of the hydraulic rod 55 when the pump 1 is working, and the sedimentation port 631 is connected with the interior of the dirt collecting ring 63; a paddle wheel 632 rotates coaxially inside the dirt collecting ring 63, and a partition net 633 is fixedly connected to the side wall of the paddle wheel 632; sedimentation grooves 634 are provided between the sedimentation ports 631, and a plurality of sedimentation grooves 634 are arranged in a ring array around the dirt collecting ring 63 and are evenly distributed between the inclined ports.

[0058] like Figure 7 As shown, the partition 633 separates the communicating area of ​​the sedimentation port 631 and the area of ​​the paddle wheel 632 into two areas, and when the rotating rod 51 rotates, the limit rotating block 61 is synchronized with the dirt collecting ring 63 through the cylindrical shaft 62, thereby driving the dirt collecting ring 63 to rotate. Since the partition 633 separates the communicating area of ​​the sedimentation port 631 and the area of ​​the paddle wheel 632 into two areas, during the filtration process of the ultrafiltration membrane 4, some metal particles that are not centrifugally thrown out by the arc-shaped leaves 53 enter the dirt collecting ring 63, and the dirt collecting ring 63 is further The metal particles are isolated outside. At the same time, due to the rotation of the fouling ring 63, part of the water enters the fouling ring 63 through the sedimentation port 631, so that after the metal particles enter, the metal will be thrown out due to centrifugation because of the different metals they contain, and then adhere to the sedimentation tank 634, concentrating the metal particles in the sedimentation tank 634, reducing the possibility of adhesion on the surface of the ultrafiltration membrane 4, thereby improving the service life. At the same time, after use, the metal particles can be thrown out by backflushing. At this time, the hydraulic rod 55 moves in the opposite direction, and the overall rotation and working mode are changed to achieve cleaning.

[0059] like Figure 8 and Figure 9 As shown, an inclined sedimentation port 631 is provided on the side wall of the dirt collecting ring 63. The inclination direction of the sedimentation port 631 is consistent with the rotation direction of the hydraulic rod 55 when the pump 1 is working, and is connected to the inside of the dirt collecting ring 63. A paddle wheel 632 is installed on the coaxial center of the dirt collecting ring 63, and a partition net 633 is connected to the side wall of the paddle wheel 632. In addition, sedimentation tanks 634 are provided between the sedimentation ports 631. These sedimentation tanks 634 are arranged in a ring around the dirt collecting ring 63 and are evenly distributed between the inclined ports, which is helpful for the treatment and maintenance of wastewater; the partition net 633 separates the connection area of ​​the sedimentation port 631 and the paddle wheel 632 area into two different areas. This separation enables the limit rotating block 61 and the dirt collecting ring 63 to rotate synchronously, and due to the presence of the paddle wheel 632 and the partition net 633, some metal particles that are not thrown out by the arc-shaped leaves 53 will enter the dirt collecting ring 63 and will be further isolated inside. As the dirt collection ring 63 rotates, a portion of water, containing various metal particles, enters the dirt collection ring 63 through the sedimentation port 631. Centrifugal force ejects these metal particles and deposits them in the sedimentation tank 634, concentrating them there. This process significantly reduces the likelihood of metal particles adhering to the surface of the ultrafiltration membrane 4, thereby extending the service life of the ultrafiltration membrane 4.

[0060] In addition, the wastewater treatment system can be cleaned by backflushing after use. The hydraulic rod 55 moves in the opposite direction, the entire system rotates and the working mode changes, which allows the metal particles to be thrown out, thereby cleaning the dirt collection ring 63 and the wastewater treatment system, maintaining the efficiency of the system.

[0061] like Figure 1 and Figure 11 As shown, during the operation of the present invention, after the material is added to the water body for sedimentation, suction is generated at one end of the ultrafiltration membrane 4 by starting the pump 1, thereby generating a pressure difference on both sides of the ultrafiltration membrane 4, and then the water molecules located on the outer wall of the ultrafiltration membrane 4 pass through the ultrafiltration membrane 4, while the metals and other organic particles are isolated outside the ultrafiltration membrane 4. In this process, due to the continuous flow of water in the ultrafiltration membrane 4 and the spiral structure design of the hydraulic rod 55, the hydraulic rod 55 begins to rotate and slide until the hydraulic rod 55 fits the drag reduction bearing 54. Until this step, the preheating stage is completed.

[0062] Under the above conditions, the magnetic pole 551 at one end of the hydraulic rod 55 interacts with the magnetic pole 551 set at one end of the rotating rod 51, and then the hydraulic rod 55 drives the rotating rod 51 to rotate, and the bidirectional groove 52 set on the side wall of the rotating rod 51 drives the limit slider to slide, so that the limit slider slides at both ends under the condition of the bidirectional groove 52, and the sliding direction is synchronized with the rotation direction of the rotating rod. Due to the setting of the closed-loop groove 521, the limit slider can adjust the direction during the closed-loop groove 521, and then move repeatedly at both ends of the rotating rod to achieve the purpose of precipitation. At the same time, the fouling ring 63 set further assists the accumulation of precipitation through centrifugation, and at the same time reduces the adhesion of metal particles on the surface of the ultrafiltration membrane 4.

[0063] In this process, the precipitation mechanism 6 rotates by the rotational power provided by the magnetic field of the countercurrent mechanism 5, and the angle limit provided by the cylindrical shaft 62 causes the dirt collecting ring 63 to rotate around the rotating rod 51, and move at both ends of the rotating rod 51 at the same time. The angle of the limit rotating block 61 is changed by the inclined slope set by the closed-loop groove 521, and then it slides in the fork-shaped groove 522 to achieve repeated movement, thereby reducing the metal particles attached to the surface of the ultrafiltration membrane 4.

[0064] In addition, in the process of setting the ultrafiltration membrane 4 inside the rotating rod 51, through the filtration of the ultrafiltration membrane 4, and taking into account the problems of subsequent cleaning and maintenance, the partition 7 set up divides the longer ultrafiltration membrane 4 into multiple sections, on the one hand, providing the rotational stability of the rotating rod 51, and on the other hand, allowing the penetrating hole 8 to provide space for the water to flow, so that it can fully contact the ultrafiltration membrane 4.

[0065] During the operation of the sedimentation mechanism 6, the paddle wheel 632 and the partition screen 633 are set, so that when the dirt collecting ring 63 rotates, some metal particles in the unfiltered water body are collected in advance and concentrated in the sedimentation tank 634 through centrifugation and rotation, so that the particles in the water body to be filtered are collected in advance by the dirt collecting ring 63 when they move toward the ultrafiltration membrane 4 due to the pressure difference.

[0066] The description herein is provided to enable one of ordinary skill in the art to implement or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the overall principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but should be given the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A recycling and treatment device for lithium iron phosphate battery wastewater, comprising a pump (1), a water outlet (2), a housing (3), an ultrafiltration membrane (4), a partition (7), a penetration hole (8) and a water inlet (9); the pump (1) is installed on one side of the housing (3), and the water inlet (9) and the water outlet (2) are connected through the ultrafiltration membrane (4); the ultrafiltration membrane (4) is evenly segmented by the partition (7), and adjacent partitions (7) are connected through the penetration hole (8); the characteristics are: The device further comprises a sedimentation mechanism (6) and a countercurrent mechanism (5), wherein the countercurrent mechanism (5) is installed on the side wall of the ultrafiltration membrane (4) and a gap is provided between the countercurrent mechanism (5) and the side wall of the ultrafiltration membrane (4), so that the water flow passing through the ultrafiltration membrane (4) impacts the hydraulic rod (55), causing the hydraulic rod (55) to rotate and exchange the position of the magnetic pole (551); the sedimentation mechanism (6) is installed on the side wall of the countercurrent mechanism (5), and the direction of the magnetic force is changed by the rotation of the hydraulic rod (55), so that the rotating rod (51) rotates, and the sedimentation mechanism (6) is limited by the acute angle end with a smaller degree in the triangular structure of the limit rotating block (61), and the angle of the limit rotating block (61) is changed by the inclination slope of the closed-loop groove (521), so as to drive the dirt collecting ring (63) to rotate under the limit of the bidirectional groove (52); The countercurrent mechanism (5) comprises a rotating rod (51), a bidirectional groove (52), an arc-shaped leaf (53), a drag reduction bearing (54) and a hydraulic rod (55); the rotating rod (51) is rotatably connected between adjacent partitions (7); the ultrafiltration membrane (4) and the rotating rod (51) are coaxially connected and fixedly connected between adjacent partitions (7); a gap is provided between the rotating rod (51) and the ultrafiltration membrane (4); a plurality of overflow ports (511) are arranged in an annular array on the side wall of the rotating rod (51); a bidirectional groove (52) for providing a sliding limit slider is provided on the side wall of the rotating rod (51); the arc-shaped leaf (53) is fixedly connected to both ends of the rotating rod (51); the drag reduction bearing (54) is fixedly connected to both ends of the rotating rod (51); and the hydraulic rod (55) is coaxially placed with the rotating rod (51); Both ends of the bidirectional groove (52) are closed-loop grooves (521), and the closed-loop grooves (521) are provided with an inclined slope for guiding the position-limiting rotating block (61), wherein a cross-fork-shaped groove (522) is provided between the two closed-loop grooves (521) and connects the closed-loop grooves (521) at both ends; The interior of the hydraulic rod (55) is fixedly connected with a magnetic pole (551), and the side walls at both ends of the rotating rod (51) are staggeredly provided with different magnetic poles (551); The precipitation mechanism (6) comprises a limit rotating block (61), a cylindrical shaft (62) and a dirt collecting ring (63); the limit rotating block (61) is arranged to be a triangular structure, and the whole is provided with a curvature that fits the bidirectional groove (52); the upper end of the limit rotating block (61) is fixedly connected to an annular opening (64) that is rotatably connected to the cylindrical shaft (62); the inner wall of the dirt collecting ring (63) is fixedly connected to the cylindrical shaft (62), wherein the rotation angle of the cylindrical shaft (62) is the same as the smallest acute angle of the limit rotating block (61).

2. The recycling and treatment device for lithium iron phosphate battery wastewater according to claim 1, characterized in that: The hydraulic rod (55) is configured to be spiral-shaped, and both ends are configured to be tapered, and both ends are structures that are clamped with the drag-reducing bearing (54).

3. The recycling and treatment device for lithium iron phosphate battery wastewater according to claim 1, characterized in that: The dirt collecting ring (63) is arranged in an annular shape, and a side wall of the dirt collecting ring (63) is provided with an inclined sedimentation port (631). The inclined direction of the sedimentation port (631) is the same as the rotation direction of the hydraulic rod (55) when the pump (1) is working. The sedimentation port (631) is communicated with the interior of the dirt collecting ring (63).

4. The recycling and treatment device for lithium iron phosphate battery wastewater according to claim 1, characterized in that: A paddle wheel (632) is coaxially rotated inside the dirt collecting ring (63), and a partition net (633) is fixedly connected to the side wall of the paddle wheel (632).

5. The recycling and treatment device for lithium iron phosphate battery wastewater according to claim 3, characterized in that: A sedimentation trough (634) is provided between the sedimentation ports (631), and a plurality of the sedimentation troughs (634) are arranged in an annular array around the fouling ring (63) and are evenly distributed between the inclined ports.

6. A process for recycling wastewater from lithium iron phosphate batteries, the process using the device for recycling wastewater from lithium iron phosphate batteries according to any one of claims 1 to 5, characterized in that: The recycling and treatment process of lithium iron phosphate battery wastewater comprises the following steps: S1: The wastewater from lithium iron phosphate batteries is collected centrally through a pipe system and then transferred to a high-efficiency sedimentation tank for a reagent reaction to promote metal precipitation. The reagent concentration is in the range of 1-5%, resulting in a large amount of metal precipitates in the sedimentation tank. S2: The supernatant enters the ceramic membrane from the sedimentation tank, wherein the ceramic membrane produces water with a SS value of ≤1ppm; at this time, the pump (1) is started to separate the water in the sedimentation tank into solid and liquid. At this time, the metal particles are first collected by the rotating sedimentation mechanism (6) and enter the sedimentation tank (634), and then the water passing through is separated into solid and liquid through the penetration hole (8); S3: Through the spiral rotation of the hydraulic rod (55) and the magnetic field providing the force for the rotation of the rotating rod (51), the dirt collecting ring (63) moves repeatedly on the side wall of the rotating rod (51), thereby achieving repeated collection of sediment; S4: Manganese sand and chelating resin are then added to the sedimentation tank to deeply remove unreacted iron, manganese, calcium, and magnesium ions in the solution. Finally, the TDS is concentrated to 150,000 mg / L through a reverse osmosis membrane or an ion exchange membrane and then fed into an MVR for evaporation to obtain salt. The pressure range of this process is set at 150-250 psi. Hot water is then used to heat the wastewater to reduce viscosity and improve separation efficiency. The hot water temperature is set between 50-70 degrees Celsius and then cooled through a cooling system to promote the sedimentation of the iron phosphate solid phase. S5: The wastewater after hot water heat exchange is passed through an ultrafiltration membrane (4) to intercept the remaining solid phase again, and the conductivity of the recycled water is reduced to below 10us / cm through an acid-resistant RO membrane process.

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