A recovery device for preparing lithium iron phosphate

Abstract

The present invention relates to the field of lithium-ion battery recycling technology, and specifically to a recycling device for preparing lithium iron phosphate, comprising a base, a sedimentation box for sedimentation provided on the outside of the base, a recovery box provided on the top of the base, a feeding device for crushing positive electrode materials provided on the top of the recovery box, and a liquid storage tank provided on the periphery of the feeding device; at least one mixing unit for feeding materials to the sedimentation box is connected to the recovery box on all sides; a flexible screen, a first flexible cloth, and a second flexible cloth are fixedly connected in sequence from top to bottom in the recovery box. In the present invention, by providing the flexible screen and the first flexible cloth, particles that meet the particle size requirements are screened, enter the mixing unit for reaction, and are then introduced into the sedimentation box for precipitation, thereby ensuring that the particles can react completely, making the reaction more uniform, and avoiding incomplete reaction due to overly large particles, thereby preventing the target component from being completely recovered.

Description

Technical Field

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

[0002] With the rapid development of the new energy vehicle and energy storage markets, lithium iron phosphate batteries have become a mainstream product on the market due to their high safety and long cycle life. However, in the production and recycling of lithium iron phosphate batteries, how to efficiently recycle the lithium iron phosphate cathode material from discarded batteries has become a key issue that needs to be addressed. Traditional recycling methods typically use chemical precipitation, which converts the cathode material from discarded batteries through a chemical reaction to precipitate reusable lithium iron phosphate raw materials. This process requires multiple steps such as crushing, screening, and mixing the cathode material to ensure the purity of the final product.

[0003] Patent application number CN201720954516.9 discloses a device for recycling positive electrode materials of waste lithium batteries, including an inner cylinder sleeved in the cylinder cavity of an outer cylinder. The inner cylinder cover is provided with a feed port and a drive shaft through hole, and crushing rollers of large and small diameter sections are inserted into the drive shaft through hole.

[0004] However, the above patent is unable to screen the particle size of the crushed particles when crushing the positive electrode material, resulting in incomplete reaction due to different particle sizes during the subsequent chemical treatment process, making it impossible to completely recover the target component, resulting in a low recovery rate of the target component. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a recovery device for preparing lithium iron phosphate to solve the technical problem of low recovery rate of target components in existing recovery devices.

[0006] Based on the above purpose, the present invention provides a recovery device for preparing lithium iron phosphate, comprising a base, a sedimentation box for sedimentation is provided on the outside of the base, a recovery box is provided on the top of the base, a feeding device for crushing the positive electrode material is provided on the top of the recovery box, and a liquid storage tank is provided on the periphery of the feeding device; at least one group of mixing parts for feeding material to the sedimentation box is connected to the four sides of the recovery box;

[0007] The recycling box is fixedly connected with a flexible screen, a first flexible cloth and a second flexible cloth in sequence from top to bottom; the bottom of the recycling box is slidably connected with a vertical rod, and a hydraulic rod for driving the vertical rod to move vertically is provided in the base, and the vertical rod is sequentially sleeved with three groups of rings from top to bottom, and the three groups of rings are respectively fixedly connected to the centers of the flexible screen, the first flexible cloth and the second flexible cloth; the wall of the recycling box is hollow to form a feeding cavity; the inner wall of the box wall is provided with at least one group of feeding ports connected to the feeding cavity, and the feeding port is located on the upper side of the flexible screen; the inner wall of the box wall is also provided with an annular discharge port connected to the feeding cavity, and the discharge port Located on the upper side of the second flexible cloth; the outer wall of the recovery box is connected with a discharge channel, which is located on the upper side of the second flexible cloth and on the lower side of the discharge port; the box wall of the recovery box is connected with a discharge pipe corresponding to the mixing part one by one, and the other end of the discharge pipe is connected to the mixing part; one side of the recovery box is fixedly connected with a vertical feeding part, the bottom feeding end of the vertical feeding part is connected with the other end of the discharge channel, and the top discharge end of the vertical feeding part is connected with the feeding device; a stirring rod is provided inside the mixing part, and a driving part for driving the stirring rod to rotate is provided at the bottom of the mixing box, and the driving part is fixedly connected to the vertical rod.

[0008] Furthermore, the vertical rod is provided with three groups of limiting parts from top to bottom, and the three groups of limiting parts correspond to the three groups of collars one by one, and are used to limit the movement distance of the collars; the limiting parts include an upper limiting groove provided on the outer periphery of the vertical rod, and a lower limiting groove provided on the outer periphery of the vertical rod, and at least one group of middle limiting grooves is provided on the outer periphery of the vertical rod between the upper limiting groove and the lower limiting groove;

[0009] The sleeve is slidably sleeved on the vertical rod, and a receiving groove is provided on the inner wall of the sleeve. A limiting block is slidably connected in the receiving groove. A spring is provided in the receiving groove, one end of the spring is connected to the receiving groove, and the other end is connected to the limiting block.

[0010] Furthermore, the middle limiting groove is a trapezoidal groove, and the upper limiting groove is a right-angled trapezoidal groove, whose right-angled side is located at the top of the groove wall; the lower limiting groove and the upper limiting groove are symmetrically arranged; the four sides of the limiting block away from the spring are sloped toward the center to form a trapezoidal block.

[0011] Furthermore, the mixing part includes a mixing box, the top of the mixing box is connected to a liquid inlet pipe, the top of the liquid inlet pipe is connected to the liquid storage tank, and a first solenoid valve is provided in the liquid inlet pipe; the mixing box is connected to a discharge pipe; the bottom of the mixing box is connected to a discharge pipe, and a second solenoid valve is provided in the discharge pipe; the outer periphery of the base is provided with a precipitation box for precipitating lithium carbonate, and the bottom end of the discharge pipe is connected to the precipitation box.

[0012] Furthermore, the stirring rod is rotatably connected to the bottom of the mixing box and passes through the mixing part downward to be exposed outward. The interior of the stirring rod is also rotatably connected to a center rod. The top and bottom of the center rod are both passed through the two ends of the stirring rod outward and exposed outward. At least one group of stirring rods is fixedly connected to the outer periphery of the top of the center rod.

[0013] Furthermore, the driving part includes an upper bevel gear, which is fixedly sleeved on the bottom of the stirring rod, and the bottom of the center rod is fixedly connected to the lower bevel gear; the bottom of the mixing box is fixedly connected to a mounting plate, and a rotating rod is rotatably connected inside the mounting plate, one end of the rotating rod is fixedly connected to the driving bevel gear, and the driving bevel gear is respectively meshed with the upper bevel gear and the lower bevel gear, and the other end of the rotating rod is fixedly connected to the transmission gear; the outer periphery of the vertical rod is fixedly connected to an annular plate, and the top of the annular plate is provided with a tooth plate corresponding to the mixing part, and the tooth plate is meshed with the transmission gear.

[0014] Furthermore, the vertical feeding part includes a feeding pipe, which is fixedly connected to the outer wall of the recovery box, the bottom of the outer periphery of the feeding pipe is connected to the discharge channel, the top of the outer periphery of the feeding pipe is connected to a material guide pipe, the discharge end of the material guide pipe is located on the upper side of the feeding device, and an auger rod for feeding is rotatably connected between the top and bottom of the inner cavity of the feeding pipe, and a driving motor for driving the auger rod to rotate is provided at the bottom of the feeding pipe.

[0015] Furthermore, a sealing plate for sealing the feed port is slidingly provided on the inner wall of the recycling box, and an electric push rod for pushing the sealing plate to slide up and down is provided on the top of the sealing plate, and the other end of the electric push rod is fixedly connected to the top of the inner wall of the recycling box.

[0016] Furthermore, the sedimentation box is divided into sedimentation chambers corresponding to the mixing parts one by one, and each sedimentation chamber is equipped with an independent water discharge and slag discharge device; a third solenoid valve is provided in the discharge pipe.

[0017] Furthermore, the feeding device includes a crushing part, which is arranged on the top of the recovery box and connected to the recovery box, for crushing the positive electrode material into particles; the top of the crushing part is connected to the feeding hopper.

[0018] Beneficial effects of the present invention: As can be seen from the above description, the present invention provides a recovery device for the preparation of lithium iron phosphate. Through the flexible screen and the first flexible cloth, particles that meet the particle size requirements enter the mixing part for reaction after screening and are then introduced into the sedimentation box for precipitation. This can ensure that the particles can react completely, make the reaction more uniform, and avoid incomplete reaction due to particles being too large, which makes it impossible to completely recover the target components. In addition, through the provided discharge cavity, particles that do not meet the requirements screened out by the flexible screen fall onto the second flexible cloth and are introduced into the vertical feed part through the discharge channel. The vertical feed part transports the particles vertically into the guide pipe, and they are introduced into the feeding device again through the guide pipe for secondary crushing and then screened again through the flexible screen. This not only avoids waste of materials, but also further improves the recovery rate of the target components. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the structure from a first perspective of an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of a partially sectional structure from a first viewing angle of an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the main cross-sectional structure of the recycling box according to an embodiment of the present invention;

[0023] Figure 4 For the embodiment of the present invention Figure 3 Schematic diagram of the enlarged structure of A;

[0024] Figure 5 This is a schematic diagram of the cross-sectional three-dimensional structure of the recycling box according to an embodiment of the present invention.

[0025] Figure 6 For the embodiment of the present invention Figure 5 Schematic diagram of the enlarged structure of B;

[0026] Figure 7 This is a schematic diagram of a partial cross-sectional structure of the vertical feeding portion according to an embodiment of the present invention;

[0027] Figure 8 This is a schematic cross-sectional view of the mixing unit according to an embodiment of the present invention;

[0028] Figure 9 For the embodiment of the present invention Figure 8Schematic diagram of the enlarged structure of C in the middle;

[0029] Figure 10 This is a schematic diagram of the main structure of the vertical rod according to an embodiment of the present invention;

[0030] Figure 11 For the embodiment of the present invention Figure 10 Schematic diagram of the enlarged structure of D in the middle;

[0031] Figure 12 This is a schematic diagram of the internal structure of the base according to an embodiment of the present invention;

[0032] Figure 13 This is a schematic diagram of a top-down cross-sectional structure of the sedimentation box according to an embodiment of the present invention;

[0033] Figure 14 This is a schematic diagram of the top view of the material guide trough according to an embodiment of the present invention.

[0034] The following are marked in the figure:

[0035] 1. Base; 101. Hydraulic rod; 2. Sedimentation tank; 3. Recovery tank; 301. Discharge chamber; 302. Feed port; 303. Discharge port; 304. Discharge channel; 3041. Discharge port; 3042. Discharge chamber; 3043. Discharge pipe; 305. Discharge pipe; 306. Guide chute; 4. Crushing unit; 401. Feed hopper; 5. Liquid storage tank; 6. Flexible screen; 7. First flexible cloth; 8. Second flexible cloth; 9. Vertical rod; 901. Ring; 902. Storage tank; 903. Upper limit slot; 904. Lower limit slot; 905. Middle limit slot; 906. Limit block; 907. Spring Spring; 10. Vertical feeding part; 1001. Feeding pipe; 1002. Auger rod; 1003. Driving motor; 1004. Material guide pipe; 11. Mixing part; 1101. Mixing box; 1102. Discharge pipe; 1103. Liquid inlet pipe; 12. Sealing plate; 1201. Electric push rod; 13. Stirring rod; 1301. Center rod; 1302. Stirring rod; 14. Driving part; 1401. Mounting plate; 1402. Rotating rod; 1403. Transmission gear; 1404. Driving bevel gear; 1405. Upper bevel gear; 1406. Lower bevel gear; 1407. Tooth plate; 1408. Ring plate. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to specific embodiments.

[0037] It should be noted that, unless otherwise defined, the technical or scientific terms used in the present invention should have the usual meanings understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0038] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 As shown, a recovery device for preparing lithium iron phosphate includes a base 1, a sedimentation tank 2 for sedimentation is provided on the outside of the base 1, a recovery tank 3 is provided on the top of the base 1, a feeding device for crushing the positive electrode material is provided on the top of the recovery tank 3, and a liquid storage tank 5 is provided on the periphery of the feeding device; the recovery tank 3 is connected to at least one group of mixing parts 11 for feeding materials to the sedimentation tank 2;

[0039] The recycling box 3 is fixedly connected with a flexible screen 6, a first flexible cloth 7 and a second flexible cloth 8 in sequence from top to bottom; the bottom of the recycling box 3 is slidably connected with a vertical rod 9, and a hydraulic rod 101 is provided in the base 1 for driving the vertical rod 9 to move vertically. The vertical rod 9 is sequentially sleeved with three groups of rings 901 from top to bottom, and the three groups of rings 901 are respectively fixedly connected to the center of the flexible screen 6, the first flexible cloth 7 and the second flexible cloth 8; the wall of the recycling box 3 is hollow to form a feeding cavity 301; the inner wall of the box wall is provided with at least one group of feeding ports 301 connected to the feeding cavity 301 02, the feed port 302 is located on the upper side of the flexible screen 6; the inner wall of the box wall is also provided with an annular discharge port 303 connected to the discharge cavity 301, and the discharge port 303 is located on the upper side of the second flexible cloth 8; the outer wall of the recovery box 3 is connected with a discharge channel 304, and the discharge channel 304 is located on the upper side of the second flexible cloth 8 and below the discharge port 303; the discharge channel 304 includes a discharge cavity 3042 opened in the wall of the recovery box 3, and the top of the discharge cavity 3042 is provided with a discharge port 3041 in the form of an annular opening and connected to the inner cavity of the recovery box 3, The bottom side of the discharge cavity 3042 is connected to a discharge pipe 3043; wherein, the bottom of the discharge cavity 3042 is inclined, and slopes downwardly toward one side of the discharge pipe 3043, playing the role of guiding the material; the wall of the recovery box 3 is connected to a discharge pipe 305 corresponding to the mixing part 11, and a guide groove 306 is provided between adjacent discharge pipes 305, and the guide groove 306 is opened on the inner wall of the recovery box 3; wherein, the center of the guide groove 306 is convex and slopes at both ends, and each end is connected to the corresponding discharge pipe 305, so as to discharge the material from the discharge pipe 305 to the two sides. 05 material guiding, improving the material guiding efficiency, the other end of the discharge pipe 305 is connected to the mixing part 11; a vertical feeding part 10 is fixedly connected to one side of the recovery box 3, and the bottom feeding end of the vertical feeding part 10 is connected to the other end of the discharge channel 304, specifically connected to the discharge pipe 3043 of the discharge channel 304, and the top discharge end of the vertical feeding part 10 is connected to the feeding device; a stirring rod 13 is provided inside the mixing part 11, and a driving part 14 for driving the stirring rod 13 to rotate is provided at the bottom of the mixing box 1101, and the driving part 14 is fixedly connected to the vertical rod 9.

[0040] In this embodiment, the positive electrode material of the battery is introduced into the feeding device by manual labor, a robotic arm, or a conveyor line. The feeding device crushes the positive electrode material into particles and then inputs the particles into the recovery box 3 for screening. The particles that meet the particle size requirements are screened out in the recovery box 3 and then introduced into the mixing part 11. The acidic solution stored in the liquid storage tank 5 is introduced into the mixing part 11 and fully mixed with the particles. The acidic solution is then introduced into the precipitation tank 2 for precipitation, so that the lithium, iron, and phosphorus in the solution form a precipitate for recovery.

[0041] Specifically, when particles are input into the recovery box 3, the hydraulic rod 101 always drives the vertical rod 9 to move up and down in the vertical direction. The vertical rod 9 drives the middle parts of the flexible screen 6, the first flexible cloth 7 and the second flexible cloth 8 to move up and down through the three sets of rings 901 to form a vibrating screening effect.

[0042] After being crushed by the feeding device, the particles fall onto the flexible screen 6. Particles that meet the particle size requirements fall onto the first flexible cloth 7. When the vertical rod 9 drives the first flexible cloth 7 to move, the particles on the first flexible cloth 7 are introduced into the discharge pipes 305 on both sides. Through the discharge pipes 305, the particles are input into the mixing section 11 to mix with the acidic solution introduced into the liquid storage tank 5. In addition, as the vertical rod 9 moves up and down, the driving section 14 continuously drives the stirring rod 13 to improve the mixing effect of the particles and the acidic solution. The solution mixed in the mixing section 11 is introduced into the sedimentation tank 2 for precipitation, so that the lithium, iron, and phosphorus in the solution are precipitated and recovered.

[0043] The particles that do not meet the requirements screened out by the flexible screen 6 enter the discharge chamber 301 through the feed port 302 and fall onto the second flexible cloth 8 through the discharge port 303. When the vertical rod 9 drives the second flexible cloth 8 to move, the particles on the second flexible cloth 8 are introduced into the discharge channel 304, and the particles are introduced into the vertical feed part 10 through the discharge pipe 3043. The vertical feed part 10 vertically transports the particles into the guide pipe 1004, and is introduced into the feeding device again through the guide pipe 1004 for secondary crushing and then screened again through the recovery box 3.

[0044] Preferably, the vertical rod 9 is provided with three groups of limiting portions from top to bottom, and the three groups of limiting portions correspond to the three groups of collars 901 one by one, and are used to limit the movement distance of the collars 901; the limiting portions include an upper limiting groove 903 provided on the outer periphery of the vertical rod 9, and also include a lower limiting groove 904 provided on the outer periphery of the vertical rod 9, and at least one group of middle limiting grooves 905 is provided on the outer periphery of the vertical rod 9 between the upper limiting groove 903 and the lower limiting groove 904;

[0045] The collar 901 is slidably mounted on the vertical rod 9. The inner wall of the collar 901 is provided with a receiving groove 902. A limit block 906 is slidably connected in the receiving groove 902. A spring 907 is provided in the receiving groove 902. One end of the spring 907 is connected to the receiving groove 902, and the other end is connected to the limit block 906.

[0046] The middle limiting groove 905 is a trapezoidal groove, and the upper limiting groove 903 is a right-angled trapezoidal groove, whose right-angled side is located at the top of the groove wall; the lower limiting groove 904 is symmetrically arranged with the upper limiting groove 903; the four sides of the limiting block 906 away from the spring 907 are sloped toward the center to form a trapezoidal block;

[0047] In this embodiment, when particles are input into the recovery box 3, the hydraulic rod 101 always drives the vertical rod 9 to move up and down in the vertical direction. The vertical rod 9 drives the middle parts of the flexible screen 6, the first flexible cloth 7 and the second flexible cloth 8 to move up and down through the three sets of rings 901 to form a vibrating screen effect.

[0048] Specifically, when the vertical rod 9 moves up and down, when the vertical rod 9 moves to the highest point, the collar 901 is first located at the upper limiting groove 903 in the limiting portion, and the limiting block 906 is elastically moved into the upper limiting groove 903; when the vertical rod 9 moves up to the highest point, the cooperation between the upper limiting groove 903 and the limiting block 906 always limits the collar 901 to the upper limiting groove 903; when the flexible screen 6, the first flexible cloth 7 or the second flexible cloth 8 arrives When the elastic limit is reached, the flexible screen 6, the first flexible cloth 7 or the second flexible cloth 8 are tensioned. After tensioning, the ring 901 is restricted from continuing to move upward, but the vertical rod 9 will continue to move upward. At this time, the inclined surface of the limit block 906 cooperates with the inclined surface at the bottom of the upper limit groove 903 to squeeze the limit block 906 back into the receiving groove 902, so that the limit block 906 slides out of the upper limit groove 903, releasing the tension of the flexible screen 6, the first flexible cloth 7 or the second flexible cloth 8; when When the collar 901 slides to the middle limit groove 905, the limit block 906 slides into the middle limit groove 905 again. At this time, the flexible screen 6, the first flexible cloth 7 or the second flexible cloth 8 are tensioned again to form a vibrating screen effect. As the vertical rod 9 continues to move upward, the limit block 906 slides in and out of the multiple groups of middle limit grooves 905 in sequence. When the vertical rod 9 moves to the top, the limit block 906 slides into the lower limit groove 904. The lower limit groove 904 is The straight edge of the bottom edge limits the limit block 906 to prevent the limit block 906 from sliding out of the limit part; similarly, when the vertical rod 9 moves down to the lowest point, the ring 901 moves from the lower limit groove 904 to the upper limit groove 903 for fixation; therefore, as the vertical rod 9 moves up and down reciprocatingly, the flexible screen 6, the first flexible cloth 7 and the second flexible cloth 8 can be vibrated and screened, and the efficiency of the discharge channel 304 and the discharge pipe 305 can be improved.

[0049] Preferably, the mixing part 11 includes a mixing box 1101, the top of the mixing box 1101 is connected to a liquid inlet pipe 1103, the top of the liquid inlet pipe 1103 is connected to the liquid storage tank 5, and a first solenoid valve is provided in the liquid inlet pipe 1103; the mixing box 1101 is connected to the discharge pipe 305; the bottom of the mixing box 1101 is connected to a discharge pipe 1102, and a second solenoid valve is provided in the discharge pipe 1102; the outer periphery of the base 1 is provided with a precipitation box 2 for precipitating lithium carbonate, and the bottom end of the discharge pipe 1102 is connected to the precipitation box 2;

[0050] When particles meeting the particle size requirements enter the mixing box 1101 through the discharge pipe 305, the first solenoid valve is opened, the acidic solution in the liquid storage tank 5 is introduced into the mixing box 1101 and mixed with the particles, and then the first solenoid valve is closed. The mixture is then stirred by the stirring rod 13 to form a mixed liquid; after mixing, the second solenoid valve is opened to introduce the mixed liquid into the sedimentation tank 2 for precipitation, so that the lithium, iron and phosphorus in the solution form a precipitate for recovery.

[0051] Preferably, the stirring rod 13 is rotatably connected to the bottom of the mixing box 1101 and downwardly penetrates the mixing part 11 to be exposed outwardly. The interior of the stirring rod 13 is further rotatably connected to a central rod 1301. The top and bottom of the central rod 1301 both penetrate the two ends of the stirring rod 13 outwardly and are exposed outwardly. At least one set of stirring rods 1302 is fixedly connected to the outer periphery of the top of the central rod 1301.

[0052] The driving part 14 includes an upper bevel gear 1405, which is fixedly sleeved on the bottom of the stirring rod 13, and the bottom of the center rod 1301 is fixedly connected to the lower bevel gear 1406; the bottom of the mixing box 1101 is fixedly connected to a mounting plate 1401, and a rotating rod 1402 is rotatably connected inside the mounting plate 1401, and one end of the rotating rod 1402 is fixedly connected to a driving bevel gear 1404, which is respectively meshed with the upper bevel gear 1405 and the lower bevel gear 1406, and the other end of the rotating rod 1402 is fixedly connected to a transmission gear 1403; the outer periphery of the vertical rod 9 is fixedly connected to an annular plate 1408, and the top of the annular plate 1408 is provided with a tooth plate 1407 corresponding to the mixing part 11, and the tooth plate 1407 is meshed with the transmission gear 1403;

[0053] When the hydraulic rod 101 drives the vertical rod 9 to move up and down, the vertical rod 9 drives the tooth plate 1407 to move upward through the annular plate 1408, and the tooth plate 1407 drives the rotating rod 1402 to rotate through the transmission gear 1403. The rotating rod 1402 drives the stirring rod 13 to rotate by driving the bevel gear 1404 and the upper bevel gear 1405. The rotation of the stirring rod 13 can improve the mixing effect of the acidic solution and the particles; and the rotating rod 1402 can also drive the center rod 1301 to rotate in the opposite direction to the stirring rod 13 by driving the bevel gear 1404 and the lower bevel gear 1406. The center rod 1301 drives the stirring rod 1302 to rotate in the opposite direction to the stirring rod 13, which can further improve the mixing effect of the acidic solution and the particles.

[0054] Preferably, the vertical feeding part 10 includes a feeding pipe 1001, which is fixedly connected to the outer wall of the recovery box 3, and the bottom of the outer periphery of the feeding pipe 1001 is connected to the discharge channel 304, specifically connected to the discharge pipe 3043 of the discharge channel 304, and the top of the outer periphery of the feeding pipe 1001 is connected to a guide pipe 1004, and the discharge end of the guide pipe 1004 is located on the upper side of the feeding device. A screw rod 1002 for feeding is rotatably connected between the top and bottom of the inner cavity of the feeding pipe 1001, and a driving motor 1003 for driving the screw rod 1002 to rotate is provided at the bottom of the feeding pipe 1001;

[0055] The particles that do not meet the particle size requirements after screening are introduced into the conveying pipe 1001 through the discharge pipe 3043 of the discharge channel 304. The driving motor 1003 drives the auger rod 1002 to rotate. The rotating auger rod 1002 can transport the particles vertically upward to the guide pipe 1004, and then introduce them into the feeding device again through the guide pipe 1004 to achieve secondary crushing.

[0056] Preferably, a sealing plate 12 for sealing the feed port 302 is slidably provided on the inner wall of the recycling box 3, and an electric push rod 1201 for pushing the sealing plate 12 to slide up and down is provided on the top of the sealing plate 12, and the other end of the electric push rod 1201 is fixedly connected to the top of the inner wall of the recycling box 3;

[0057] When the flexible screen 6 is screening the particles, the electric push rod 1201 is first controlled to drive the sealing plate 12 to move downward to seal the feed port 302 to prevent the particles that have not been screened from directly entering the feed port 302; when the flexible screen 6 has screened the particles for a period of time, the sealing plate 12 is controlled to move upward to release the seal on the feed port 302; at this time, the particles that do not meet the particle size requirements screened by the flexible screen 6 are introduced into the feed port 302.

[0058] Preferably, the sedimentation box 2 is divided into sedimentation chambers corresponding to the mixing parts 11, and each sedimentation chamber is equipped with an independent water drainage and slag discharge device; a third solenoid valve is provided in the discharge pipe 305; the third solenoid valve can control the particles screened by the recovery box 3 to be introduced into multiple groups of mixing parts 11 in sequence, so as to realize the continuity of work; specifically, after a group of positive electrode materials is crushed, a certain group of third solenoid valves is opened first to introduce the screened particles into a certain group of mixing parts 11, and then introduced into the sedimentation chamber corresponding to the mixing part 11 after mixing in the mixing part 11, and then the third solenoid valve of this group is closed; after the next group of positive electrode materials is crushed, another group of third solenoid valves is opened to introduce the screened particles into the mixing part 11 of another group and into the sedimentation chamber corresponding thereto, so as to realize continuous work and improve work efficiency.

[0059] Preferably, the feeding device includes a crushing part 4, which is arranged on the top of the recovery box 3 and is connected to the recovery box 3, for crushing the positive electrode material into particles; the top of the crushing part 4 is connected to the feeding hopper 401;

[0060] Specifically, when the positive electrode material of the battery is introduced into the crushing part 4 through the feed hopper 401 by manual means, a robotic arm, or a conveyor line, the crushing part 4 can crush the positive electrode material into particles.

[0061] The recovery device for preparing lithium iron phosphate provided by the present invention, through the flexible screen 6 and the first flexible cloth 7, the particles that meet the particle size requirements enter the mixing part 11 for reaction after screening, and are then introduced into the sedimentation box 2 for precipitation, which can ensure that the particles can react completely, make the reaction more uniform, and avoid incomplete reaction due to excessively large particles and the inability to completely recover the target components; in addition, through the provided discharge cavity 301, the particles that do not meet the requirements screened out by the flexible screen 6 fall onto the second flexible cloth 8 and are introduced into the vertical feed part 10 through the discharge channel 304. The vertical feed part 10 vertically transports the particles into the guide pipe 1004, and they are again introduced into the feeding device through the guide pipe 1004 for secondary crushing and then screened again by the flexible screen 6, which not only avoids material waste but also further improves the recovery rate of the target components.

[0062] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention is limited to these examples. Within the scope of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0063] Any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A recovery device for preparing lithium iron phosphate, comprising a base (1), the base (1) being provided with a sedimentation box (2) for sedimentation, characterized in that: A recovery box (3) is provided on the top of the base (1), a feeding device for crushing the positive electrode material is provided on the top of the recovery box (3), and a liquid storage tank (5) is provided on the periphery of the feeding device; at least one group of mixing parts (11) for feeding materials to the precipitation box (2) is connected to the periphery of the recovery box (3); The recycling box (3) is fixedly connected with a flexible screen (6), a first flexible cloth (7) and a second flexible cloth (8) in sequence from top to bottom; the bottom of the recycling box (3) is slidably connected with a vertical rod (9), and a hydraulic rod (101) for driving the vertical rod (9) to move vertically is provided in the base (1), and the vertical rod (9) is sleeved with three groups of rings (901) in sequence from top to bottom, and the three groups of rings (901) are fixedly connected to the centers of the flexible screen (6), the first flexible cloth (7) and the second flexible cloth (8) respectively; the box wall of the recycling box (3) is hollow to form a feeding cavity (301); the inner wall of the box wall is provided with at least one group of feeding ports (302) communicating with the feeding cavity (301), and the feeding port (302) is located on the upper side of the flexible screen (6); the inner wall of the box wall is also provided with an annular discharge port (303) communicating with the feeding cavity (301), and the discharge port (303) is located at the bottom of the box wall. on the upper side of the second flexible cloth (8); the outer wall of the recovery box (3) is connected with a discharge channel (304), which is located on the upper side of the second flexible cloth (8) and on the lower side of the discharge port (303); the box wall of the recovery box (3) is connected with a discharge pipe (305) corresponding to the mixing part (11), and the other end of the discharge pipe (305) is connected to the mixing part (11); one side of the recovery box (3) is fixedly connected with a vertical feeding part (10), the bottom feeding end of the vertical feeding part (10) is connected with the other end of the discharge channel (304), and the top discharge end of the vertical feeding part (10) is connected with the feeding device; a stirring rod (13) is provided inside the mixing part (11), and a driving part (14) for driving the stirring rod (13) to rotate is provided at the bottom of the mixing box (1101), and the driving part (14) is fixedly connected to the vertical rod (9).

2. The recovery device for preparing lithium iron phosphate according to claim 1, characterized in that: The vertical rod (9) is provided with three groups of limiting parts from top to bottom, and the three groups of limiting parts correspond to the three groups of collars (901) one by one, and are used to limit the moving distance of the collars (901); the limiting parts include an upper limiting groove (903) provided on the outer periphery of the vertical rod (9), and also include a lower limiting groove (904) provided on the outer periphery of the vertical rod (9); at least one group of middle limiting grooves (905) is provided on the outer periphery of the vertical rod (9) between the upper limiting groove (903) and the lower limiting groove (904); The collar (901) is slidably mounted on the vertical rod (9); a receiving groove (902) is provided on the inner wall of the collar (901); a limiting block (906) is slidably connected in the receiving groove (902); a spring (907) is provided in the receiving groove (902); one end of the spring (907) is connected to the receiving groove (902), and the other end is connected to the limiting block (906).

3. The recovery device for preparing lithium iron phosphate according to claim 2, characterized in that: The middle limiting groove (905) is a trapezoidal groove, and the upper limiting groove (903) is a right-angled trapezoidal groove, the right-angled side of which is located at the top of the groove wall; the lower limiting groove (904) is symmetrically arranged with the upper limiting groove (903); the four sides of the limiting block (906) away from the spring (907) are sloped toward the center to form a trapezoidal block.

4. The recovery device for preparing lithium iron phosphate according to claim 1, characterized in that: The mixing section (11) comprises a mixing box (1101), the top of the mixing box (1101) is connected to a liquid inlet pipe (1103), the top of the liquid inlet pipe (1103) is connected to a liquid storage tank (5), and a first solenoid valve is provided in the liquid inlet pipe (1103); the mixing box (1101) is connected to a discharge pipe (305); the bottom of the mixing box (1101) is connected to a discharge pipe (1102), and a second solenoid valve is provided in the discharge pipe (1102); the outer periphery of the base (1) is provided with a precipitation box (2) for precipitating lithium carbonate, and the bottom end of the discharge pipe (1102) is connected to the precipitation box (2).

5. The recovery device for preparing lithium iron phosphate according to claim 1, characterized in that: The stirring rod (13) is rotatably connected to the bottom of the mixing box (1101) and passes through the mixing part (11) downward to be exposed outward. The interior of the stirring rod (13) is also rotatably connected to a center rod (1301). The top and bottom of the center rod (1301) are both passed through the two ends of the stirring rod (13) outward and exposed outward. At least one group of stirring rods (1302) is fixedly connected to the outer periphery of the top of the center rod (1301).

6. The recovery device for preparing lithium iron phosphate according to claim 5, characterized in that: The driving part (14) includes an upper bevel gear (1405), which is fixedly sleeved on the bottom of the stirring rod (13), and the bottom of the center rod (1301) is fixedly connected to the lower bevel gear (1406); the bottom of the mixing box (1101) is fixedly connected to a mounting plate (1401), and a rotating rod (1402) is rotatably connected in the mounting plate (1401), and one end of the rotating rod (1402) is fixedly connected to the driving bevel gear ( 1404), the driving bevel gear (1404) is respectively engaged with the upper bevel gear (1405) and the lower bevel gear (1406), and the other end of the rotating rod (1402) is fixedly connected to the transmission gear (1403); the outer periphery of the vertical rod (9) is fixedly connected to the annular plate (1408), and the top of the annular plate (1408) is provided with a tooth plate (1407) corresponding to the mixing part (11), and the tooth plate (1407) is engaged with the transmission gear (1403).

7. The recovery device for preparing lithium iron phosphate according to claim 1, characterized in that: The vertical feeding portion (10) comprises a feeding pipe (1001), wherein the feeding pipe (1001) is fixedly connected to the outer wall of the recovery box (3), the bottom of the outer periphery of the feeding pipe (1001) is connected to the discharge channel (304), the top of the outer periphery of the feeding pipe (1001) is connected to a guide pipe (1004), the discharge end of the guide pipe (1004) is located on the upper side of the feeding device, an auger rod (1002) for feeding is rotatably connected between the top and bottom of the inner cavity of the feeding pipe (1001), and a driving motor (1003) for driving the auger rod (1002) to rotate is provided at the bottom of the feeding pipe (1001).

8. The recovery device for preparing lithium iron phosphate according to claim 1, characterized in that: The inner wall of the recycling box (3) is slidably provided with a sealing plate (12) for sealing the feed port (302), and the top of the sealing plate (12) is provided with an electric push rod (1201) for pushing the sealing plate (12) to slide up and down, and the other end of the electric push rod (1201) is fixedly connected to the top of the inner wall of the recycling box (3).

9. The recovery device for preparing lithium iron phosphate according to claim 1, characterized in that: The sedimentation box (2) is divided into sedimentation chambers corresponding to the mixing parts (11) one by one, and each sedimentation chamber is equipped with an independent water discharge and slag discharge device; a third electromagnetic valve is provided in the discharge pipe (305).

10. The recovery device for preparing lithium iron phosphate according to claim 1, characterized in that: The feeding device comprises a crushing portion (4), which is arranged on the top of the recovery box (3) and is connected to the recovery box (3) for crushing the positive electrode material into particles; the top of the crushing portion (4) is connected to a feeding hopper (401).

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