Regeneration device and method for waste lithium iron phosphate positive electrode material

Abstract

The invention provides a waste lithium iron phosphate positive electrode material regeneration device and a method thereof. The waste lithium iron phosphate positive electrode material regeneration device comprises a lifting base; the support is installed on the lifting base, the support is rotatably connected with a rotating shaft, the rotating shaft is hollow, the outer surface of the rotating shaft is fixedly connected with a first gear, and one end of the rotating shaft is provided with a material mixing barrel. According to the regeneration device and method for the waste lithium iron phosphate positive electrode material, when materials are mixed and stirred through the stirring assembly, the turbulent flow assembly can be linked to manufacture local turbulent flow and eddy flow, shearing force generated by turbulent flow can break the laminar flow state, local concentration difference and reaction dead angles are avoided, and the regeneration efficiency is improved. The reagent can quickly permeate into the waste lithium iron phosphate positive electrode material, and meanwhile, reaction products are accelerated to be desorbed from particle surfaces and diffused to a solution main body, so that the extraction efficiency of a lithium battery is greatly improved, and the reaction time is shortened.

Description

Technical Field

[0001] This invention relates to the field of waste lithium battery extraction, and more particularly to a device and method for regenerating waste lithium iron phosphate cathode materials. Background Technology

[0002] With the rapid development of electric vehicles and energy storage systems, the number of spent lithium iron phosphate (LFP, LiFePO4) batteries has increased dramatically. These spent LFP batteries contain large amounts of valuable elements such as lithium, iron, and phosphorus. Directly discarding them not only wastes resources but also pollutes the environment. Therefore, the recycling of spent LFP cathode materials has become a hot research topic in the industry. The core objective is to achieve efficient separation and high-value recovery of elements such as lithium, iron, and phosphorus, to re-prepare cathode materials that meet usage requirements, and to build a closed-loop industrial chain of "resources-products-waste-recycled resources".

[0003] Among the relevant technologies, there are physical and chemical methods for recycling waste lithium iron phosphate batteries. The physical recycling process uses dismantling as a pretreatment, crushes the waste positive electrode, and then uses different sorting methods to achieve material separation and resource recovery.

[0004] Currently, in the use of traditional waste lithium iron phosphate cathode material regeneration devices, the leaching and purification reactions of waste lithium iron phosphate cathode materials rely on sufficient contact between the solid and liquid phases. Traditional stirring easily forms a laminar flow zone, resulting in a slow mass transfer rate between the reagents in the solution and the particle surface, incomplete reaction, and difficulty in cleaning the filter plate during solid-liquid separation. Therefore, the filter plate pores inevitably have particulate matter attached, affecting water permeability and thus reducing the solid-liquid separation rate.

[0005] Therefore, it is necessary to provide a device and method for regenerating waste lithium iron phosphate cathode materials to solve the above-mentioned technical problems. Summary of the Invention

[0006] This invention provides a device and method for regenerating waste lithium iron phosphate cathode materials, which solves the problems of traditional stirring easily forming a laminar flow zone, resulting in slow mass transfer rate between reagents and particle surfaces in the solution, insufficient reaction, and inconvenience in cleaning the filter plate during solid-liquid separation.

[0007] To solve the above-mentioned technical problems, the waste lithium iron phosphate cathode material regeneration device provided by the present invention includes: a lifting base;

[0008] A support frame is mounted on the lifting base. A rotating shaft is rotatably connected to the support frame. The rotating shaft is hollow and a first gear is fixedly connected to the outer surface of the rotating shaft. A mixing cylinder is mounted on one end of the rotating shaft. A material trough is mounted on the mixing cylinder and rotatably connected to the support frame. A filter element is mounted on the top of the mixing cylinder for solid-liquid separation of the material.

[0009] A stirring assembly is mounted on the rotating shaft, the stirring assembly passes through the mixing cylinder and extends into the interior of the mixing cylinder, and the stirring assembly is used for mixing and stirring materials;

[0010] A turbulence-disrupting component is installed inside the mixing cylinder. When the stirring component rotates, the turbulence-disrupting component is used to turbulent the material during mixing and stirring.

[0011] A limiting component is mounted on the rotating shaft and is used to limit and fix the rotating shaft.

[0012] A connecting frame is mounted on the top of the bracket, and a cleaning component is installed on the connecting frame for unclogging the filter element;

[0013] A drive assembly is mounted on the right side of the connecting frame and is used to drive the rotating shaft, the stirring assembly, and the cleaning assembly.

[0014] A collection tank, which is mounted on the support, is used to collect the filtrate after solid-liquid separation.

[0015] Preferably, the stirring assembly includes a stirring shaft, a second gear, stirring blades, a stabilizing frame, a connecting plate, and a connecting block. The stirring shaft is rotatably connected to the inner surface of the rotating shaft, the second gear is fixed to the stirring shaft, the stirring blades are fixed to the stirring shaft, the stabilizing frame is rotatably connected to one end of the stirring shaft and fixed to the side wall of the mixing cylinder, the connecting plate is fixed to the outer surface of the stirring shaft, and the connecting block is fixed to one side of the connecting plate.

[0016] Preferably, the turbulence-disrupting assembly includes a fixed frame, a turbulence-disrupting plate, a movable plate, a sliding plate, a fixed plate, an arc-shaped inclined block, and a reset structure. The fixed frame is fixed inside the mixing cylinder, the turbulence-disrupting plate is rotatably connected to the fixed frame, the movable plate is slidably connected to the turbulence-disrupting plate, the sliding plate is slidably connected to the fixed frame, the movable plate is rotatably connected to the sliding plate, the fixed plate is fixed to one side of the sliding plate, the arc-shaped inclined block is fixed to the fixed plate, and the reset structure is installed on the side wall of the fixed frame.

[0017] Preferably, the reset structure includes a fixed box, a first elastic element, and a reset block. The fixed box is fixed to the side wall of the fixed frame, the reset block is slidably connected to the inside of the fixed box, and one side of the reset block is fixed to the sliding plate. The first elastic element is installed between the reset block and the side wall of the fixed box.

[0018] Preferably, the limiting component includes a circular plate, a limiting block, a second elastic element, and a limiting sleeve. The circular plate is slidably connected to the outer surface of the rotating shaft, the limiting block is fixed to the circular plate, the second elastic element is installed on one side of the circular plate and sleeved on the rotating shaft, the limiting sleeve is fixed to the bracket, and the limiting block is inserted into the limiting sleeve.

[0019] Preferably, the cleaning assembly includes a connecting frame, a moving plate, a connecting block, a drain plate, a third elastic element, a drive shaft, a third gear, a driven shaft, an eccentric wheel, and a transmission structure. The connecting frame is fixed to the connecting bracket, the moving plate is slidably connected within the connecting frame, the connecting block is fixed to the moving plate, the connecting block passes through the connecting frame and extends to the outside of the connecting frame, the drain plate is fixed to the connecting block, the third elastic element is installed at the bottom of the moving plate, the drive shaft is installed on the connecting frame, the third gear is fixed to one end of the drive shaft, the driven shaft is installed on the connecting frame, the eccentric wheel is fixed to one end of the driven shaft, and the transmission structure is installed between the drive shaft and the driven shaft.

[0020] Preferably, the transmission structure includes two transmission wheels and a transmission belt, one of the transmission wheels is fixed on the drive shaft, the other transmission wheel is fixed on the driven shaft, and the transmission belt is installed between the outer surfaces of the two transmission wheels.

[0021] Preferably, the drive assembly includes a protective frame, a pusher, a push plate, a drive component, a drive rod, a sleeve rod, a fourth gear, a connecting rod, and a stop block. The protective frame is fixed to the connecting frame, the pusher is mounted on the protective frame, the push plate is fixed to the output end of the pusher and slidably connected to the protective frame, the drive component is mounted on the protective frame, the drive rod is fixed to the output shaft of the drive component, the sleeve rod is rotatably connected to the push plate and slidably connected to the drive rod, the fourth gear is fixed to the outer surface of the sleeve rod, the connecting rod is fixed to one end of the sleeve rod, and the stop block is fixed to one end of the connecting rod.

[0022] This invention also provides a method for regenerating waste lithium iron phosphate cathode materials, including the aforementioned waste lithium iron phosphate cathode material regeneration device and the following steps:

[0023] S1. Discharge the waste LiFePO4 battery to obtain the positive electrode sheet, and obtain waste LiFePO4 positive electrode powder through crushing, sieving and other steps.

[0024] S2. Mix the waste LiFePO4 cathode powder with sulfuric acid, adjust the pH, filter, and obtain lithium filtrate and filter residue.

[0025] S3. Adjust the pH of the lithium filtrate and remove impurities to obtain a lithium enrichment solution;

[0026] S4. Add ammonium phosphate solution to the lithium enrichment solution, filter, and obtain lithium phosphate and filtrate;

[0027] S5. Mix the filter residue obtained in step S2 and the filtrate obtained in step S4, add a small amount of phosphoric acid and hydrogen peroxide, filter, and obtain an aqueous solution containing iron and phosphorus.

[0028] S6. Heat and keep warm the aqueous solution containing iron and phosphorus to obtain FePO4·2H2O precipitate;

[0029] S7. Calcine the FePO4·2H2O precipitate to obtain FePO4;

[0030] S8. Mix FePO4, glucose, lithium carbonate and magnesium oxide / aluminum oxide dopant, mill and spray dry to obtain a mixture;

[0031] S9. Hollow out the center of the carbon felt to form a groove, place the mixture obtained in step S8 into it, cover it with carbon paper, heat it, and obtain the regenerated LFP / C cathode material.

[0032] Compared with related technologies, the waste lithium iron phosphate cathode material regeneration device and method provided by the present invention have the following beneficial effects:

[0033] This invention provides a device and method for regenerating waste lithium iron phosphate cathode materials. When the material is mixed and stirred by the stirring component, the invention can activate a turbulence-inducing component to create localized turbulence and eddies. The shear force generated by the turbulence breaks the laminar flow state, avoiding localized concentration differences and reaction dead zones, allowing reagents to quickly penetrate the waste lithium iron phosphate cathode material. Simultaneously, it accelerates the desorption of reaction products from the particle surface and their diffusion into the bulk solution, significantly improving the extraction efficiency of lithium batteries and shortening the reaction time. Through the extension of the pushing component and the rotation of the driving component, the device can quickly switch to a solid-liquid separation state, facilitating the separation of filtrate and filter residue, reducing transfer steps, and improving the processing efficiency of waste lithium iron phosphate cathode materials. Through the contraction of the pushing component and the rotation of the driving component, the device can quickly switch to a cleaning state, facilitating the cleaning and unblocking of the filter element, preventing particulate matter from affecting its permeability, and reducing the cost of manual cleaning. Attached Figure Description

[0034] Figure 1 A schematic diagram of the structure of the first embodiment of the waste lithium iron phosphate cathode material regeneration device and method provided by the present invention;

[0035] Figure 2 for Figure 1 A schematic cross-sectional view of the mixing cylinder shown;

[0036] Figure 3 for Figure 2 The enlarged schematic diagram of part A shown below;

[0037] Figure 4 for Figure 2 The diagram shows the structure of the stirring assembly.

[0038] Figure 5 for Figure 2 The diagram shows the structure of the turbulence-inducing component.

[0039] Figure 6 for Figure 2 The diagram shows the structure of the cleaning component.

[0040] Figure 7 for Figure 2 The diagram shows the structure of the driving component.

[0041] Figure 8 This is an initial state diagram of the present invention;

[0042] Figure 9 This is a schematic diagram showing the state of the pusher component after it has been extended.

[0043] Figure 10 This is a schematic diagram showing the state of the pusher component after it has contracted.

[0044] Figure 11 This is a schematic flowchart of a second embodiment of the waste lithium iron phosphate cathode material regeneration device and method provided by the present invention.

[0045] Numbering on the map:

[0046] 1. Lifting base; 2. Support frame; 3. Rotating shaft; 4. First gear; 5. Mixing cylinder; 6. Material trough; 7. Filter element.

[0047] 8. Stirring assembly; 81. Stirring shaft; 82. Second gear; 83. Stirring blade; 84. Stabilizer; 85. Connecting plate; 86. Connecting block;

[0048] 9. spoiler assembly; 91. fixed frame; 92. spoiler; 93. movable plate; 94. sliding plate; 95. fixed plate; 96. arc-shaped inclined block; 97. reset structure; 971. fixed box; 972. first elastic element; 973. reset block.

[0049] 10. Limiting component; 101. Circular plate; 102. Limiting block; 103. Second elastic element; 104. Limiting sleeve;

[0050] 11. Connecting frame;

[0051] 12. Cleaning component; 120. Connecting frame; 121. Moving plate; 122. Connecting block; 123. Unblocking plate; 124. Third elastic element; 125. Drive shaft; 126. Third gear; 127. Driven shaft; 128. Eccentric wheel; 129. Transmission structure; 1291. Transmission wheel; 1292. Transmission belt.

[0052] 13. Drive assembly; 131. Protective frame; 132. Pushing component; 133. Push plate; 134. Drive component; 135. Drive rod; 136. Sleeve rod; 137. Fourth gear; 138. Connecting rod; 139. Abutting block;

[0053] 14. Collection tank. Detailed Implementation

[0054] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0055] First Embodiment

[0056] Please refer to the following: Figures 1-10 The present invention provides a device for regenerating waste lithium iron phosphate cathode materials, comprising: a lifting base 1;

[0057] A bracket 2 is mounted on the lifting base 1. A rotating shaft 3 is rotatably connected to the bracket 2. The rotating shaft 3 is hollow. A first gear 4 is fixedly connected to the outer surface of the rotating shaft 3. A mixing cylinder 5 is mounted on one end of the rotating shaft 3. A material trough 6 is mounted on the mixing cylinder 5. The material trough 6 is rotatably connected to the bracket 2. A filter element 7 is mounted on the top of the mixing cylinder 5. The filter element 7 is used for solid-liquid separation of materials.

[0058] A stirring assembly 8 is mounted on the rotating shaft 3, passes through the mixing cylinder 5 and extends into the interior of the mixing cylinder 5, and is used for mixing and stirring materials.

[0059] A turbulence-disrupting component 9 is installed inside the mixing cylinder 5. When the stirring component 8 rotates, the turbulence-disrupting component 9 is used to turbulent the material during mixing and stirring.

[0060] A limiting component 10 is mounted on the rotating shaft 3 and is used to limit and fix the rotating shaft 3.

[0061] A connecting frame 11 is installed on the top of the bracket 2, and a cleaning component 12 is installed on the connecting frame 11. The cleaning component 12 is used to unclog the filter element 7.

[0062] Drive assembly 13 is installed on the right side of the connecting frame 11, and the drive assembly 13 is used to drive the rotating shaft 3, the stirring assembly 8 and the cleaning assembly 12.

[0063] Collection tank 14 is installed on the bracket 2 and is used to collect the filtrate after solid-liquid separation.

[0064] In this embodiment, the filter element 7 includes, but is not limited to, filter screens or filter plates, as long as it can achieve solid-liquid separation. The filter element 7 can be detachably installed on the mixing cylinder 5 and can be a snap-on type or a bolt type.

[0065] In this embodiment, the mixing cylinder 5 is also provided with a heating structure, which includes, but is not limited to, electric heating, steam heating, etc., as long as it can achieve a heating effect during the material reaction.

[0066] In this embodiment, the feed trough 6 is used for adding and discharging materials, and an opening and closing valve is installed on the feed trough 6 to control its opening and closing.

[0067] In this embodiment, the lifting base 1 includes a fixed base and a movable base. The movable base is movably connected to the fixed base, and a cylinder is installed between the fixed base and the movable base, which can lift one side of the movable base to tilt the movable base, thereby facilitating the discharge of filter residue from the material tank 6.

[0068] It should be noted that in this embodiment, all electrical components are connected to an external power source through a control system.

[0069] Please refer to the following: Figure 2 and Figure 4 The stirring assembly 8 includes a stirring shaft 81, a second gear 82, a stirring blade 83, a stabilizing frame 84, a connecting plate 85, and a connecting block 86. The stirring shaft 81 is rotatably connected to the inner surface of the rotating shaft 3. The second gear 82 is fixed to the stirring shaft 81. The stirring blade 83 is fixed to the stirring shaft 81. The stabilizing frame 84 is rotatably connected to one end of the stirring shaft 81 and is fixed to the side wall of the mixing cylinder 5. The connecting plate 85 is fixed to the outer surface of the stirring shaft 81, and the connecting block 86 is fixed to one side of the connecting plate 85.

[0070] In this embodiment, in the initial state, the second gear 82 and the fourth gear 137 are in a meshing state. The rotation of the fourth gear 137 driven by the driving member 134 can drive the second gear 82 to rotate, thereby driving the stirring shaft 81.

[0071] Preferably, the number of stirring blades 83 is three.

[0072] In this embodiment, the stabilizing frame 84 provides stable support for the stirring shaft 81, thereby improving the rotational stability of the stirring shaft 81.

[0073] In use, the rotation of the fourth gear 137 drives the second gear 82 to rotate, thereby causing the stirring shaft 81 to rotate, which in turn drives the stirring blade 83 to rotate, thus achieving the mixing and stirring of materials. While the stirring shaft 81 rotates, it will drive the connecting plate 85 to rotate, which in turn causes the connecting block 86 to move in a circular motion, touching the turbulence component 9 and causing the turbulence component 9 to swing in conjunction, creating local turbulence and eddies, thereby improving the mixing effect.

[0074] Please refer to the following: Figure 2 and Figure 5 The turbulence-disrupting component 9 includes a fixed frame 91, a turbulence-disrupting plate 92, a movable plate 93, a sliding plate 94, a fixed plate 95, an arc-shaped inclined block 96, and a reset structure 97. The fixed frame 91 is fixed inside the mixing cylinder 5. The turbulence-disrupting plate 92 is rotatably connected to the fixed frame 91. The movable plate 93 is slidably connected to the turbulence-disrupting plate 92. The sliding plate 94 is slidably connected to the fixed frame 91. The movable plate 93 is rotatably connected to the sliding plate 94. The fixed plate 95 is fixed to one side of the sliding plate 94. The arc-shaped inclined block 96 is fixed to the fixed plate 95. The reset structure 97 is installed on the side wall of the fixed frame 91.

[0075] In this embodiment, the spoiler 92 is hollow inside, and the movable plate 93 is slidably connected therein. When the sliding plate 94 slides to the left, the spoiler 92 can be driven to swing clockwise along its axis through the movable plate 93.

[0076] Furthermore, the arc-shaped inclined block 96 is aligned with the connecting block 86. When the connecting block 86 moves in a circular motion, it can contact the arc-shaped inclined block 96. Since the arc-shaped inclined block 96 is narrower at the front and wider at the back, when the connecting block 86 contacts the arc-shaped inclined block 96 and moves from the narrow side to the wide side, it will cause the arc-shaped inclined block 96 to be squeezed and move to the left.

[0077] In use, when the stirring component 8 rotates, the connecting block 86 will move in a circular motion. The connecting block 86 can easily contact the arc-shaped inclined block 96, causing the arc-shaped inclined block 96 to move to the left, thereby driving the sliding plate 94 to move to the left. This causes the baffle 92 to swing clockwise along its axis of rotation. When the sliding plate 94 moves to the left, it will squeeze the reset structure 97. As the connecting block 86 moves in a circular motion, the connecting block 86 will move away from the arc-shaped inclined block 96. At this time, the reset structure 97 will rebound and drive the sliding plate 94 to move to the right to reset, thereby causing the baffle 92 to swing counterclockwise along its axis of rotation, thus realizing the back-and-forth swing of the baffle 92 and producing a turbulence effect.

[0078] Please refer to it again. Figure 5The reset structure 97 includes a fixed box 971, a first elastic element 972, and a reset block 973. The fixed box 971 is fixed to the side wall of the fixed frame 91. The reset block 973 is slidably connected to the inside of the fixed box 971, and one side of the reset block 973 is fixed to the sliding plate 94. The first elastic element 972 is installed between the reset block 973 and the side wall of the fixed box 971.

[0079] In this embodiment, the first elastic element 972 may include, but is not limited to, a spring, an arc-shaped spring sheet, or a pneumatic piston cylinder, etc., as long as it provides a rightward rebound force to the reset block 973 after the reset block 973 moves to the left.

[0080] In use, when the sliding plate 94 is subjected to force and moves to the left, it will drive the reset block 973 to move to the left, thereby squeezing the first elastic member 972. The first elastic member 972 provides a rightward rebound force to the reset block 973. When the sliding plate 94 removes the force to the left, the first elastic member 972 will rebound and drive the reset block 973 to move to the right, thereby causing the sliding plate 94 to move to the right and reset.

[0081] Please refer to the following: Figure 3 The limiting component 10 includes a circular plate 101, a limiting block 102, a second elastic element 103, and a limiting sleeve 104. The circular plate 101 is slidably connected to the outer surface of the rotating shaft 3. The limiting block 102 is fixed on the circular plate 101. The second elastic element 103 is installed on one side of the circular plate 101 and sleeved on the rotating shaft 3. The limiting sleeve 104 is fixed on the bracket 2, and the limiting block 102 is inserted into the limiting sleeve 104.

[0082] In this embodiment, the limiting block 102 and the limiting sleeve 104 are adapted to each other, and there are two of each limiting block 102 and limiting sleeve 104, and they are aligned with each other.

[0083] In this embodiment, the second elastic element 103 includes, but is not limited to, springs, arc-shaped spring sheets, or pneumatic piston cylinders, etc., as long as it provides a rightward rebound force to the circular plate 101 after it moves to the left.

[0084] Preferably, an anti-rotation block is also installed on the inner surface of the circular plate 101, and an anti-rotation groove is also provided on the outer surface of the rotating shaft 3. The anti-rotation block is slidably connected in the anti-rotation groove, thereby ensuring that the circular plate 101 can only slide left and right on the surface of the rotating shaft 3 and will not rotate on the surface of the rotating rod 112.

[0085] In the initial state, the limiting block 102 is inserted into the limiting sleeve 104, and the limiting sleeve 104 is fixed on the bracket 2. Therefore, the rotating shaft 3 cannot rotate. After limiting the rotating shaft 3, it is ensured that when the driving component 134 drives the stirring shaft 81, the rotating shaft 3 is in a stable state and will not rotate with the stirring shaft 81.

[0086] When the pusher 132 extends, it drives the fourth gear 137 to mesh with the first gear 4, thereby driving the rotating shaft 3. During this process, the circular plate 101 will be pushed to the left through the connecting rod 138 and the abutment block 139, thereby causing the limit block 102 to leave the limit sleeve 104, achieving the automatic unlocking effect of the rotating shaft 3.

[0087] Please refer to the following: Figure 6 The cleaning assembly 12 includes a connecting frame 120, a moving plate 121, a connecting block 122, a drain plate 123, a third elastic element 124, a drive shaft 125, a third gear 126, a driven shaft 127, an eccentric wheel 128, and a transmission structure 129. The connecting frame 120 is fixed to the connecting bracket 11. The moving plate 121 is slidably connected to the connecting frame 120. The connecting block 122 is fixed to the moving plate 121 and extends through the connecting frame 120 to the connecting plate 129. Outside the frame 120, the unblocking plate 123 is fixed to the connecting block 122, the third elastic element 124 is installed on the bottom of the moving plate 121, the drive shaft 125 is installed on the connecting frame 120, the third gear 126 is fixed to one end of the drive shaft 125, the driven shaft 127 is installed on the connecting frame 120, the eccentric wheel 128 is fixed to one end of the driven shaft 127, and the transmission structure 129 is installed between the drive shaft 125 and the driven shaft 127.

[0088] In this embodiment, the third elastic element 124 includes, but is not limited to, springs, arc-shaped spring sheets, or pneumatic piston cylinders, etc., as long as it provides an upward rebound force to the moving plate 121 after the moving plate 121 moves downward.

[0089] In this embodiment, the unclogging plate 123 includes a plate body and a plurality of unclogging needles. The plurality of unclogging needles are mounted on the plate body and are aligned and adapted to the filter holes of the filter element 7.

[0090] In this embodiment, the left side of the connecting frame 120 is provided with an opening groove for the connecting block 122 to move up and down.

[0091] In use, when the fourth gear 137 meshes with the third gear 126, the rotation of the driving component 134 drives the fourth gear 137 to rotate, which in turn causes the third gear 126 to rotate, driving the drive shaft 125 to rotate. Through the transmission structure 129, the driven shaft 127 rotates, which in turn drives the eccentric wheel 128 to rotate. The compression of the eccentric wheel 128, combined with the rebound of the third elastic component 124, causes the moving plate 121 to move down and then up repeatedly, which in turn causes the unblocking plate 123 to move down and then up repeatedly, cleaning and unblocking the filter holes of the filter element 7. During cleaning and unblocking, the filter element 7 is at the top of the mixing cylinder 5, and its own gravity allows some particles to fall off, reducing the difficulty of cleaning.

[0092] Please refer to it again. Figure 6 The transmission structure 129 includes two transmission wheels 1291 and a transmission belt 1292. One of the transmission wheels 1291 is fixed on the drive shaft 125, and the other transmission wheel 1291 is fixed on the driven shaft 127. The transmission belt 1292 is installed between the outer surfaces of the two transmission wheels 1291.

[0093] In this embodiment, the transmission wheel 1291 includes, but is not limited to, pulleys or sprockets, and the transmission belt 1292 includes, but is not limited to, belts or chains.

[0094] Preferably, the transmission wheel 1291 is a sprocket and the transmission belt 1292 is a chain.

[0095] Please refer to the following: Figure 7 The drive assembly 13 includes a protective frame 131, a pusher 132, a push plate 133, a drive member 134, a drive rod 135, a sleeve rod 136, a fourth gear 137, a connecting rod 138, and a contact block 139. The protective frame 131 is fixed to the connecting frame 11, the pusher 132 is mounted on the protective frame 131, the push plate 133 is fixed to the output end of the pusher 132, and the push plate 133 is slidably connected to the protective frame 131. Above, the driving component 134 is mounted on the protective frame 131, the driving rod 135 is fixed on the output shaft of the driving component 134, the sleeve rod 136 is rotatably connected to the push plate 133, and the sleeve rod 136 is slidably connected to the driving rod 135, the fourth gear 137 is fixed on the outer surface of the sleeve rod 136, the connecting rod 138 is fixed to one end of the sleeve rod 136, and the abutment block 139 is fixed to one end of the connecting rod 138.

[0096] In this embodiment, the pusher 132 may include, but is not limited to, electric push rods, cylinders, hydraulic cylinders or linear motors, etc., as long as it can drive the pusher plate 133 to move linearly to the left or right.

[0097] In this embodiment, the driving component 134 may include, but is not limited to, a motor, a pneumatic motor, or a hydraulic motor, as long as it can drive the driving rod 135 to rotate.

[0098] In this embodiment, a locking structure is also installed between the drive rod 135 and the sleeve rod 136. The locking structure includes at least one locking groove and a locking block. The locking groove is opened on the inner surface of the sleeve rod 136, and the locking block is fixedly connected to the outer surface of the drive rod 135. The locking block is slidably connected in the locking groove, thereby ensuring that when the sleeve rod 136 slides left and right on the surface of the drive rod 135, it can also rotate with the drive rod 135, avoiding slippage and free rotation between the two.

[0099] Preferably, the fourth gear 137 is on the same meshing plane as the first gear 4, the second gear 82, and the third gear 126.

[0100] In the initial state, when in use, the rotation of the drive component 134 drives the drive rod 135 to rotate, thereby causing the sleeve rod 136 to rotate and drive the fourth gear 137 to rotate. The fourth gear 137 meshes with the second gear 82, thereby driving the stirring assembly 8.

[0101] The extension of the pusher 132 causes the pusher plate 133 to move to the left, which in turn causes the sleeve rod 136 to move to the left, so that the fourth gear 137 meshes with the first gear 4. The limiting assembly 10 is opened by the connecting rod 138 and the abutment block 139. Then, the rotation of the drive member 134 causes the sleeve rod 136 to rotate, which in turn causes the fourth gear 137 to drive the rotating shaft 3.

[0102] The retraction of the pusher 132 causes the pusher plate 133 to move to the right, which in turn causes the sleeve rod 136 to move to the right, so that the fourth gear 137 meshes with the third gear 126, and drives the cleaning assembly 12 in conjunction with the rotation of the drive member 134.

[0103] The working principle of the waste lithium iron phosphate cathode material regeneration device and method provided by this invention is as follows:

[0104] Please refer to the following: Figure 8 The material is fed into the mixing cylinder 5. The rotation of the drive component 134 drives the sleeve rod 136 to rotate, which in turn drives the fourth gear 137 to rotate the second gear 82, thereby causing the stirring shaft 81 to rotate and mix the material. While the stirring shaft 81 is rotating, it will drive the connecting block 86 to make a circular motion, which will touch the arc-shaped inclined block 96, causing the arc-shaped inclined block 96 to move back and forth, which in turn indirectly causes the sliding plate 94 to move back and forth, thereby causing the baffle plate 92 to swing back and forth to turbulence.

[0105] Please refer to the following: Figure 9 After mixing, the extension of the pusher 132 causes the pusher plate 133 to move to the left, which in turn causes the sleeve rod 136 to move to the left, causing the fourth gear 137 to separate from the second gear 82 and mesh with the first gear 4. At this time, after the sleeve rod 136 moves to the left, it will push open the limiting component 10 through the abutment block 139, so that the rotating shaft 3 is unlocked. In addition, the rotation of the drive component 134 can indirectly drive the first gear 4 to rotate, thereby causing the rotating shaft 3 to rotate, which in turn causes the mixing cylinder 5 to rotate half a turn, so that the filter element 7 faces downwards, and the mixed material is separated into solid and liquid.

[0106] Please refer to the following: Figure 10 After solid-liquid separation is completed, the rotating shaft 3 is reset by the reverse rotation of the drive component 134, which in turn resets the mixing cylinder 5. Then, the pusher 132 retracts, causing the pusher plate 133 to move to the right, which in turn causes the sleeve rod 136 to move to the right, causing the fourth gear 137 to separate from the first gear 4 and mesh with the third gear 126. At this time, the limiting component 10 locks the rotating shaft 3 again. With the rotation of the drive component 134, the third gear 126 can be rotated, which causes the eccentric wheel 128 to rotate, driving the moving plate 121 to move vertically back and forth, which in turn drives the unblocking plate 123 to move vertically back and forth to clean and unblock the filter element 7.

[0107] Compared with related technologies, the waste lithium iron phosphate cathode material regeneration device and method provided by the present invention have the following beneficial effects:

[0108] When the stirring component 8 mixes and stirs the materials, the present invention can activate the turbulence component 9 to create local turbulence and eddies. The shear force generated by the turbulence can break the laminar flow state, avoid local concentration differences and reaction dead zones, and allow the reagent to quickly penetrate into the waste lithium iron phosphate cathode material. At the same time, it accelerates the desorption of reaction products from the particle surface and diffusion into the bulk solution, significantly improving the extraction efficiency of lithium batteries and shortening the reaction time. By extending the pusher 132 in conjunction with rotating the drive 134, the device can be quickly switched to a solid-liquid separation state, which facilitates the separation of filtrate and filter residue, reduces transfer steps, and improves the processing efficiency of waste lithium iron phosphate cathode material. By contracting the pusher 132 in conjunction with rotating the drive 134, the device can be quickly switched to a cleaning state, which facilitates the cleaning and unblocking of the filter element 7, prevents the filter element 7 from being affected by particulate matter, and reduces the cost of manual cleaning.

[0109] Second Embodiment

[0110] Please refer to the following: Figure 11 The present invention also provides a method for regenerating waste lithium iron phosphate cathode materials, including the aforementioned waste lithium iron phosphate cathode material regeneration device and the following steps:

[0111] S1. Discharge the waste LiFePO4 battery to obtain the positive electrode sheet, and obtain waste LiFePO4 positive electrode powder through crushing, sieving and other steps.

[0112] S2. Mix the waste LiFePO4 cathode powder with 8 mol / L sulfuric acid, adjust the pH to 3, react at 25℃ for 15 min, filter, and obtain lithium filtrate and filter residue.

[0113] S3. Adjust the pH of the lithium filtrate to 10, remove impurities, and obtain a lithium enrichment solution;

[0114] S4. Add ammonium phosphate solution to the lithium enrichment solution, filter, and obtain lithium phosphate and filtrate;

[0115] S5. Mix the filter residue obtained in step S2 and the filtrate obtained in step S4, add a small amount of phosphoric acid and hydrogen peroxide, filter, and obtain an aqueous solution containing iron and phosphorus.

[0116] S6. Heat the aqueous solution containing iron and phosphorus to 90°C and keep it at that temperature for 1 hour to obtain FePO4·2H2O precipitate.

[0117] S7. Calcine the FePO4·2H2O precipitate at 600℃ for 2 hours to obtain FePO4;

[0118] S8. Mix FePO4, glucose, lithium carbonate and magnesium oxide / aluminum oxide (mass ratio 2:1) dopant, mill and spray dry to obtain a mixture;

[0119] S9. Hollow out the center of the carbon felt into a groove with dimensions of 4.0cm×8.0cm×6.3mm and a depth of 3.0mm. Place the mixture obtained in step S8 into the groove, cover it with carbon paper, and use a commercial arc welding machine as a constant power source to heat the reactants with an electric current of 12A and a temperature of 750℃ to obtain the regenerated LFP / C cathode material.

[0120] Compared with related technologies, the waste lithium iron phosphate cathode material regeneration device and method provided by the present invention have the following beneficial effects:

[0121] This invention achieves effective resource recovery and reuse by recovering and recycling H3PO4 from the filtrate, reducing the consumption of chemical reagents and secondary pollution. The entire recovery process is pollution-free, and the recovered ammonium ions can be converted into valuable nitrogen fertilizer products, reducing dependence on traditional nitrogen fertilizer production. The carbon felt acts as an electric heater, exhibiting good thermal stability and higher heating efficiency than traditional heat conduction. The method of this invention is applicable to multi-element doping and different cathodes, enhancing the electrochemical stability after regeneration and improving its high-voltage cycling stability.

[0122] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A device for regenerating waste lithium iron phosphate cathode materials, characterized in that, include: Raise the base; A support frame is mounted on the lifting base. A rotating shaft is rotatably connected to the support frame. The rotating shaft is hollow and a first gear is fixedly connected to the outer surface of the rotating shaft. A mixing cylinder is mounted on one end of the rotating shaft. A material trough is mounted on the mixing cylinder and rotatably connected to the support frame. A filter element is mounted on the top of the mixing cylinder for solid-liquid separation of the material. A stirring assembly is mounted on the rotating shaft, the stirring assembly passes through the mixing cylinder and extends into the interior of the mixing cylinder, and the stirring assembly is used for mixing and stirring materials; A turbulence-disrupting component is installed inside the mixing cylinder. When the stirring component rotates, the turbulence-disrupting component is used to turbulent the material during mixing and stirring. A limiting component is mounted on the rotating shaft and is used to limit and fix the rotating shaft. A connecting frame is mounted on the top of the bracket, and a cleaning component is installed on the connecting frame for unclogging the filter element; A drive assembly is mounted on the right side of the connecting frame and is used to drive the rotating shaft, the stirring assembly, and the cleaning assembly. A collection tank, which is mounted on the support, is used to collect the filtrate after solid-liquid separation.

2. The waste lithium iron phosphate cathode material regeneration device according to claim 1, characterized in that, The mixing assembly includes a mixing shaft, a second gear, mixing blades, a stabilizing frame, a connecting plate, and a connecting block. The mixing shaft is rotatably connected to the inner surface of the rotating shaft. The second gear is fixed to the mixing shaft. The mixing blades are fixed to the mixing shaft. The stabilizing frame is rotatably connected to one end of the mixing shaft and is fixed to the side wall of the mixing cylinder. The connecting plate is fixed to the outer surface of the mixing shaft, and the connecting block is fixed to one side of the connecting plate.

3. The waste lithium iron phosphate cathode material regeneration device according to claim 1, characterized in that, The turbulence-disrupting assembly includes a fixed frame, a turbulence-disrupting plate, a movable plate, a sliding plate, a fixed plate, an arc-shaped inclined block, and a reset structure. The fixed frame is fixed inside the mixing cylinder. The turbulence-disrupting plate is rotatably connected to the fixed frame. The movable plate is slidably connected to the turbulence-disrupting plate. The sliding plate is slidably connected to the fixed frame. The movable plate is rotatably connected to the sliding plate. The fixed plate is fixed to one side of the sliding plate. The arc-shaped inclined block is fixed to the fixed plate. The reset structure is installed on the side wall of the fixed frame.

4. The waste lithium iron phosphate cathode material regeneration device according to claim 3, characterized in that, The reset structure includes a fixed box, a first elastic element, and a reset block. The fixed box is fixed to the side wall of the fixed frame, the reset block is slidably connected to the inside of the fixed box, and one side of the reset block is fixed to the sliding plate. The first elastic element is installed between the reset block and the side wall of the fixed box.

5. The waste lithium iron phosphate cathode material regeneration device according to claim 1, characterized in that, The limiting assembly includes a circular plate, a limiting block, a second elastic element, and a limiting sleeve. The circular plate is slidably connected to the outer surface of the rotating shaft. The limiting block is fixed to the circular plate. The second elastic element is installed on one side of the circular plate and sleeved on the rotating shaft. The limiting sleeve is fixed to the bracket. The limiting block is inserted into the limiting sleeve.

6. The waste lithium iron phosphate cathode material regeneration device according to claim 1, characterized in that, The cleaning assembly includes a connecting frame, a moving plate, a connecting block, a drain plate, a third elastic element, a drive shaft, a third gear, a driven shaft, an eccentric wheel, and a transmission structure. The connecting frame is fixed to the connecting bracket. The moving plate is slidably connected within the connecting frame. The connecting block is fixed to the moving plate and extends through the connecting frame to the outside of the connecting frame. The drain plate is fixed to the connecting block. The third elastic element is installed at the bottom of the moving plate. The drive shaft is installed on the connecting frame. The third gear is fixed to one end of the drive shaft. The driven shaft is installed on the connecting frame. The eccentric wheel is fixed to one end of the driven shaft. The transmission structure is installed between the drive shaft and the driven shaft.

7. The waste lithium iron phosphate cathode material regeneration device according to claim 6, characterized in that, The transmission structure includes two transmission wheels and a transmission belt. One of the transmission wheels is fixed on the drive shaft, and the other transmission wheel is fixed on the driven shaft. The transmission belt is installed between the outer surfaces of the two transmission wheels.

8. The waste lithium iron phosphate cathode material regeneration device according to claim 1, characterized in that, The drive assembly includes a protective frame, a pusher, a push plate, a drive component, a drive rod, a sleeve rod, a fourth gear, a connecting rod, and a stop block. The protective frame is fixed to the connecting frame, the pusher is mounted on the protective frame, the push plate is fixed to the output end of the pusher and slidably connected to the protective frame, the drive component is mounted on the protective frame, the drive rod is fixed to the output shaft of the drive component, the sleeve rod is rotatably connected to the push plate and slidably connected to the drive rod, the fourth gear is fixed to the outer surface of the sleeve rod, the connecting rod is fixed to one end of the sleeve rod, and the stop block is fixed to one end of the connecting rod.

9. A method for regenerating waste lithium iron phosphate cathode material, characterized in that, Includes the waste lithium iron phosphate cathode material regeneration device as described in any one of claims 1-8 and the following steps: S1. Discharge the waste LiFePO4 battery to obtain the positive electrode sheet, and obtain waste LiFePO4 positive electrode powder through crushing, sieving and other steps. S2. Mix the waste LiFePO4 cathode powder with sulfuric acid, adjust the pH, filter, and obtain lithium filtrate and filter residue. S3. Adjust the pH of the lithium filtrate and remove impurities to obtain a lithium enrichment solution; S4. Add ammonium phosphate solution to the lithium enrichment solution, filter, and obtain lithium phosphate and filtrate; S5. Mix the filter residue obtained in step S2 and the filtrate obtained in step S4, add a small amount of phosphoric acid and hydrogen peroxide, filter, and obtain an aqueous solution containing iron and phosphorus. S6. Heat and keep warm the aqueous solution containing iron and phosphorus to obtain FePO4·2H2O precipitate; S7. Calcine the FePO4·2H2O precipitate to obtain FePO4; S8. Mix FePO4, glucose, lithium carbonate and magnesium oxide / aluminum oxide dopant, mill and spray dry to obtain a mixture; S9. Hollow out the center of the carbon felt to form a groove, place the mixture obtained in step S8 into it, cover it with carbon paper, heat it, and obtain the regenerated LFP / C cathode material.

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