Piezoelectric catalytic lithium pre-extraction equipment and working method thereof

Abstract

The present application discloses a piezoelectric catalytic lithium pre-extraction device and a working method thereof, wherein the piezoelectric catalytic lithium pre-extraction device comprises a piezoelectric lithium extraction device, the piezoelectric lithium extraction device comprises a screening mechanism, a piezoelectric stirring lithium extraction mechanism and a separation mechanism, the piezoelectric stirring lithium extraction mechanism comprises a stirring shell and a piezoelectric stirring member, the stirring shell comprises a stirring body and a plurality of partitions, the piezoelectric stirring member comprises a stirring shaft group, a plurality of groups of piezoelectric stirring members and a plurality of scraping members, each of the piezoelectric stirring members comprises an inner roller and a second piezoelectric coating formed on the outer surface of the inner roller, and the separation mechanism comprises a second separation member. In this way, the lithium in the pole powder is leached into the water as much as possible by piezoelectric stirring the pole powder slurry to obtain a lithium extraction slurry, so as to achieve lithium pre-extraction. In addition, the copper-aluminum material doped in the slurry is subjected to solid-liquid separation and the separated pole powder slurry is subjected to piezoelectric stirring operation to recover the pole powder as much as possible, thereby improving the lithium extraction rate.

Description

Technical Field

[0001] The invention relates to the technical field of waste lithium battery recycling, and in particular to a piezoelectric catalytic lithium pre-extraction device and a working method thereof. Background Art

[0002] At present, the new generation of energy industries, such as electronic products, new energy electric vehicles, and electrochemical energy storage, with batteries as the core, are booming. Lithium batteries have the advantages of high energy density, wide operating temperature range, safety and reliability, and are widely used in electronic devices such as smart phones, laptops, and electric vehicles.

[0003] In the early days of lithium battery development, due to small production and applicability of standards, waste lithium batteries were treated as general solid waste. Since lithium batteries contain toxic compounds such as conductive agents and electrolytes, the pollutants produced by waste lithium batteries after long-term exposure to air or combustion will cause serious harm to the human body and the surrounding environment. With the increase in the volume of the lithium battery industry, a large number of waste lithium batteries can no longer be disposed of by simple landfill or incineration. At the same time, due to the shortage of lithium mineral resources and the large demand for lithium in the market, this requires the rapid development of waste lithium battery recycling technology. There are various processes for treating waste lithium batteries, including acid leaching.

[0004] In the acid leaching method, the pole powder obtained by pre-treatment of waste lithium batteries is mixed with acid, and a leaching reaction is carried out under heating conditions to dissolve lithium in the acid solution. Then, impurities are removed through neutralization, precipitation, filtration and other steps to obtain a lithium-containing solution, and then the lithium-containing solution is treated by chemical precipitation or electrolysis. Obviously, a large amount of reagents is required in this process, and the impurity removal operation is complicated. The equipment cost is relatively high, the processing cost is also relatively high, and the operation is complicated. Summary of the invention

[0005] In order to solve the above technical problems and achieve at least one advantage of the present invention, the present invention provides a piezoelectric catalytic lithium pre-extraction device, the piezoelectric catalytic lithium pre-extraction device comprises a piezoelectric lithium extraction device, the piezoelectric lithium extraction device comprises:

[0006] A sieving mechanism, wherein the sieving mechanism is configured to sieve a mixed slurry formed by mixing the powder obtained after pretreatment of the waste lithium battery with water to obtain a slurry containing copper and aluminum materials and a pole powder slurry;

[0007] Piezoelectric stirring lithium extraction mechanism, the piezoelectric stirring lithium extraction mechanism comprises:

[0008] A stirring shell, the stirring shell comprising a stirring body and a plurality of partitions, the plurality of partitions being stacked in the stirring body in a manner of being spaced a predetermined distance vertically and dividing the internal space of the stirring body into a plurality of stirring chambers, each of the partitions forming a discharge trough penetrating from top to bottom, the discharge trough of each of the partitions connecting two adjacent stirring chambers, the stirring body having at least one inlet and outlet, the inlet being connected to the stirring chamber located at the uppermost layer, and the inlet being connected to the screening mechanism through a pipeline, the extreme powder slurry separated by the screening mechanism entering the stirring body through the inlet, and the outlet being connected to the stirring chamber located at the lowermost layer;

[0009] The piezoelectric stirring component comprises a stirring shaft group, a plurality of piezoelectric stirring elements and a plurality of scraping elements, the stirring shaft group is inserted into the stirring body, the plurality of piezoelectric stirring elements and the plurality of scraping elements are arranged on the peripheral side of the stirring shaft group and connected to the stirring shaft group, the stirring shaft group can be driven to rotate to drive all the piezoelectric stirring elements and the scraping elements to make circular motion around the axis of the stirring shaft group, a group of piezoelectric stirring elements and a scraping element are arranged in each stirring chamber, each piezoelectric stirring element comprises an inner roller and a second piezoelectric coating formed on the outer surface of the inner roller, the inner roller is connected to the stirring shaft group, and in the plurality of groups of piezoelectric stirring elements When driven to rotate, the piezoelectric stirring element in the stirring chamber at the uppermost layer stirs the pole powder slurry so that the pole powder in the pole powder slurry rubs against water, the pole powder rubs against the pole powder, and the pole powder rubs against the second piezoelectric coating to leach at least part of the lithium. Each of the scraping elements can be driven by the stirring shaft group to rotate so as to scrape the pole powder slurry in the corresponding stirring chamber to the discharge trough for discharge from the discharge trough. The piezoelectric stirring element in the stirring chamber at the lower layer stirs the pole powder slurry discharged from the stirring chamber at the upper layer to further leach lithium. The outlet corresponds to the discharge trough of the separator at the lower layer, and the outlet is used to discharge the lithium extraction slurry obtained by multiple lithium leaching.

[0010] A separation mechanism, the separation mechanism comprising:

[0011] A second separation member, the second separation member is connected to the screening mechanism through a pipeline, the copper-aluminum slurry separated by the screening mechanism is introduced into the second separation member, the second separation member is configured to perform solid-liquid separation on the copper-aluminum slurry to obtain copper-aluminum material and pole powder slurry, the second separation member is connected to at least one of the introduction ports, and the pole powder slurry separated by the second separation member is introduced into the stirring body through the introduction port.

[0012] According to one embodiment of the present invention, the stirring shaft group includes a main shaft and multiple groups of pillars, the multiple groups of pillars are vertically arranged in the radial direction of the main shaft at a predetermined distance, and a group of pillars is arranged in each stirring chamber, each inner roller is rotatably sleeved on one of the pillars, the main shaft can be driven to rotate to drive all the inner rollers and the pillars to make circular motion around the axis of the main shaft, and in the process of the piezoelectric stirring element stirring the pole powder slurry, the piezoelectric stirring element rubs against the pole powder slurry in the corresponding stirring chamber and rotates to drive the pole powder slurry located near the main shaft to move.

[0013] According to one embodiment of the present invention, the screening mechanism includes a main body, a screening component and at least one vibrator, the screening component includes a screen frame and at least one screening component, the screen frame is movably installed on the main body, the screen frame has a frame groove, the screening component is installed in the frame groove and has a spacing with the bottom wall of the screen frame, the vibrator is installed on the screen frame, the screen frame can be driven by the vibrator to vibrate and drive the screening component to move together, the mixed slurry is screened by the screening component to separate the copper-aluminum slurry and the extreme powder slurry, wherein the copper-aluminum slurry is located above the screening component, and the extreme powder slurry passes through the screening component and flows to the bottom of the screen frame, the screening component is inclined, and the mixed slurry is guided to flow to The high end of the screening assembly, the bottom wall of the frame groove is inclined and the inclination direction is the same as the inclination direction of the screening assembly, the main body has an under-screen cavity and an over-screen cavity, the bottom end of each frame groove is connected with the under-screen cavity, the pole powder slurry in the frame groove can flow along the bottom wall of the frame groove under the action of its own gravity and enter the under-screen cavity, the under-screen cavity is connected with the inlet through a pipeline, the over-screen cavity corresponds to the low end of the screening assembly, the copper and aluminum slurry located on the upper surface of the screening assembly moves from the high end of the screening assembly to the low end thereof under the vibration action of the screening assembly and finally vibrates away from the screening assembly and falls into the over-screen cavity, the second separation member is connected with the over-screen cavity through a pipeline.

[0014] According to one embodiment of the present invention, the screening assembly includes at least one screening mesh and a piezoelectric screening mesh, the piezoelectric screening mesh includes a mesh body and a first piezoelectric coating formed on the surface of the mesh body, the mesh body and the screening mesh are stacked in the frame groove and can vibrate together with the screening frame, the screen cavity corresponds to the lower end of the screening mesh, and during the vibration of the screening assembly, at least part of the copper and aluminum materials in the mixed slurry are intercepted by the screening mesh and form a copper-aluminum-doped slurry with part of the slurry, and the copper-aluminum-doped slurry moves from the high end of the screening mesh to the lower end thereof under the vibration action of the corresponding screening mesh and falls into the screen cavity, the pole powder slurry in the mixed slurry passes through the screening mesh and the piezoelectric screening mesh, and under the vibration action of the piezoelectric screening mesh, the pole powder in the pole powder slurry rubs against water, the pole powder rubs against the pole powder, and the pole powder rubs against the first piezoelectric coating to leach at least part of the lithium in the pole powder into the water.

[0015] According to one embodiment of the present invention, the separation mechanism includes a first separation component, which is connected to the guide port, and the lithium extraction slurry produced by the piezoelectric stirring lithium extraction mechanism is introduced into the first separation component. The first separation component is configured to perform solid-liquid separation on the lithium extraction slurry to obtain lithium-free pole powder and lithium liquid.

[0016] According to one embodiment of the present invention, the piezoelectric catalytic lithium pre-extraction equipment includes a pretreatment device, the pretreatment device includes a crushing mechanism and a separation unit, the crushing mechanism includes a crushing unit, the crushing unit is configured to crush waste lithium batteries into a mixture and release volatile organic matter, wherein the mixture includes diaphragm crushes and powder containing copper, aluminum and pole powder, the separation unit is connected to the crushing unit, the mixture and volatile organic matter obtained by crushing the crushing unit are introduced into the separation unit, the separation unit is configured to separate part of the powder and the volatile organic matter as a whole, the diaphragm crushes and the remaining part of the powder, the piezoelectric catalytic lithium pre-extraction equipment also includes a pulping device, the top of the pulping device is connected to the pretreatment device through a pipeline, the powder obtained by the pretreatment device is introduced into the pulping device, the pulping device is configured to mix the powder with water to obtain a mixed slurry, and the screening mechanism is connected to the pulping device through a pipeline.

[0017] According to one embodiment of the present invention, the pulping device includes a pulping body, and the pulping body includes a pulping cylinder and a material equalizing plate group. The pulping cylinder has a feed chamber and a mixing chamber located at the bottom of the feed chamber and connected to the feed chamber. The top of the pulping cylinder also forms a feed port connected to the feed chamber, and the feed port is connected to the pretreatment device through a pipeline. The feed port is used to introduce powder into the feed chamber. The pulping cylinder also has at least one water inlet connected to the feed chamber, and the water inlet is used to supply water to the feed chamber. The material equalizing plate group includes at least one first material equalizing plate and at least one second material equalizing plate, and at least The first material balancing plate and at least one second material balancing plate are arranged in the mixing chamber at intervals along the vertical direction. In the direction in which the side wall of the mixing chamber is extended from the center of the mixing chamber to the pulping cylinder to form the mixing chamber, the distance between the upper surface of the first material balancing plate and a horizontal plane located below it gradually decreases, and the distance between the upper surface of the second material balancing plate and a horizontal plane located below it gradually increases. Among the first material balancing plates and the second material balancing plates arranged in the vertical direction, one first material balancing plate is located at the uppermost layer, and one second material balancing plate is located at the lowermost layer. The first material balancing plate is formed at its position close to the peripheral wall of the pulping cylinder. A plurality of first material-passing holes are formed, and the plurality of first material-passing holes all correspond to the edge of the second material-distributing plate located therebelow, the slurry located above the first material-distributing plate flows downward through the first material-passing holes to flow to the edge of the second material-distributing plate located therebelow, the second material-distributing plate forms a second material-passing hole which is coaxial with the slurry-making cylinder and corresponds to the center of the first material-distributing plate, the slurry located above the second material-distributing plate flows downward through the second material-passing holes to flow to the center of the first material-distributing plate located therebelow or the outside of the slurry-making cylinder, in the mixture composed of the powder introduced by the feed inlet and the water introduced by the water inlet After the slurry is introduced from the feed chamber into the mixing chamber, the slurry flows in sequence to at least one of the first material balancing plate and at least one of the second material balancing plate arranged at intervals. The slurry first flows to the center of the first material balancing plate and flows to its edge under the action of gravity for mixing. The slurry first flows to the edge of the second material balancing plate and flows to its center under the action of gravity for mixing. The second through hole of the second material balancing plate located at the bottom layer is used to discharge the mixed slurry in the mixing chamber. The mixed slurry discharged from the second through hole of the second material balancing plate located at the bottom layer flows to the high end of the screening assembly through a pipeline.

[0018] According to one embodiment of the present invention, the pulping device also includes a divider, which is installed above the first material equalizing plate located on the top layer and located at the center corresponding to the first material equalizing plate. The divider corresponds to the feed chamber, and the top of the divider is open and can accommodate slurry. The slurry that moves through the feed chamber and flows to the mixing chamber is first gathered in the divider.

[0019] According to one embodiment of the present invention, the pulping device also includes at least one mixing element, which is installed in the feed chamber. The mixing element extends downwardly from one side wall of the feed chamber and is inclined toward the center, and there is a gap between the other opposite side wall of the feed chamber. The mixing element is located on the flow path of the powder introduced into the feed chamber from the feed port.

[0020] In order to solve the above technical problems and achieve at least one advantage of the present invention, the present invention provides a working method of a piezoelectric catalytic lithium pre-extraction device, comprising the following steps:

[0021] The screening mechanism screens the mixed slurry to separate the copper-aluminum slurry and the ultra-fine powder slurry;

[0022] The pole powder slurry separated by the screening mechanism is introduced into the stirring chamber located at the uppermost layer from the inlet of the stirring body, and the piezoelectric stirring element in the stirring chamber located at the uppermost layer is driven by the stirring shaft group to rotate to stir the pole powder slurry in the corresponding stirring chamber, so that the pole powder in the pole powder slurry rubs with water, the pole powder rubs with the pole powder, and the pole powder rubs with the second piezoelectric coating to leach at least part of the lithium, and at the same time, the scraping element in the corresponding stirring chamber is driven by the stirring shaft group to rotate to scrape the lithium extraction slurry to the discharge trough so as to be discharged from the discharge trough to the next stirring chamber, so as to perform piezoelectric stirring operations multiple times, and finally discharge the lithium extraction slurry obtained by multiple lithium leaching from the outlet;

[0023] The copper-aluminum material in the slurry separated by the screening mechanism is introduced into the second separation component, and the second separation component performs solid-liquid separation on the copper-aluminum material in the slurry to obtain copper-aluminum material and pole powder slurry. The pole powder slurry separated by the second separation component is introduced into the stirring body through the introduction port.

[0024] Compared with the prior art, the piezoelectric catalytic lithium pre-extraction device of the present invention has the following technical effects:

[0025] 1. The pre-treated powder is mixed with water to obtain a mixed slurry, which is then sieved to obtain a pole powder slurry and a copper-aluminum material mixed slurry. The pole powder slurry is piezoelectrically stirred to allow the lithium in the pole powder to be leached into the water as much as possible to obtain a lithium extraction slurry. Compared with the existing acid leaching method for lithium extraction, no reagents are required, and no impurity removal is required. The operation is simple, and the equipment cost and processing cost are relatively low. In addition, the copper-aluminum material mixed slurry is solid-liquid separated and the separated pole powder slurry is piezoelectrically stirred to recover the pole powder as much as possible, thereby improving the lithium extraction rate.

[0026] 2. The slurry of lithium extraction is obtained by piezoelectric stirring the sieved pole powder slurry, and then the lithium extraction slurry is separated into solid and liquid to obtain lithium liquid and lithium-removing pole powder, so as to realize pre-extraction of lithium.

[0027] 3. The pole powder slurry is piezoelectrically treated while being screened, and the lithium extraction slurry and the copper-aluminum doped slurry are piezoelectrically treated while undergoing solid-liquid separation. Based on the piezoelectric stirring operation, the lithium leaching rate is maximized to achieve efficient lithium extraction.

[0028] 4. When making pulp, the first and second material balancing plates are used to guide the slurry, and the fluidity and gravity of the slurry are used to repeat the mixing operation to ensure that the mixing degree of the uniform slurry meets the solid-liquid ratio required for piezoelectric lithium extraction. Compared with the existing stirring mixer, it does not require power, is energy-saving and environmentally friendly, has low operating costs, and does not require shutdown. It can meet large-scale continuous feeding and realize continuous mixing. It has good mixing effect and higher efficiency.

[0029] 5. During slurrying, the slurry composed of powder and water is first gathered in the equalizing member, so that when the slurry in the equalizing member reaches its maximum capacity, the slurry overflows from the top of the equalizing member and overflows downward along its peripheral wall to flow to the top of the first equalizing plate located at the top layer. In this process, the equalizing member distributes the flow of the slurry to ensure that the slurry falling on the surface of the first equalizing plate located at the top layer is evenly distributed near its center to prevent the slurry from affecting the mixing effect due to uneven distribution of the slurry during the process of flowing to the edge of the corresponding first equalizing plate. In addition, the slurry is temporarily gathered in the equalizing member, which is conducive to mixing, and the slurry in the equalizing member is impacted by the slurry that continues to flow to the equalizing member to accelerate mixing.

[0030] 6. During the piezoelectric stirring process, the piezoelectric stirring element rubs against the pole powder slurry in the corresponding stirring chamber and rotates to drive the pole powder slurry located near the main shaft to move, so as to prevent part of the pole powder slurry from gathering on the side of the main shaft, thereby ensuring that the pole powder slurry in the stirring chamber can be effectively piezoelectrically stirred, thereby improving the reaction degree of the pole powder slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The schematic diagram of the structure of the piezoelectric catalytic lithium pre-extraction device of the present invention is shown.

[0032] Figure 2 A top view of the structure of the piezoelectric catalytic lithium pre-extraction device of the present invention is shown.

[0033] Figure 3 A schematic structural diagram of the pulping device of the present invention is shown.

[0034] Figure 4 A structural cross-sectional view of the pulping device of the present invention is shown.

[0035] Figure 5 A schematic structural diagram of the screening mechanism of the present invention is shown.

[0036] Figure 6 A structural cross-sectional view of the screening mechanism of the present invention is shown.

[0037] Figure 7 Shows Figure 6 A magnified view of the local structure.

[0038] Figure 8 A structural schematic diagram of the piezoelectric stirring lithium extraction mechanism of the present invention is shown.

[0039] Fig. 9 A partial structural cross-sectional view of the piezoelectric stirring lithium extraction mechanism of the present invention is shown.

[0040] Fig.10 Shows Fig. 9 A magnified view of the local structure.

[0041] Reference numerals:

[0042] 10. Pretreatment device; 11. Crushing mechanism; 111. Crushing unit; 1111. Crusher; 1112. Shredder; 112. Grinding machine; 12. Separation unit; 121. Collector; 122. Dust removal unit; 123. Screening unit; 13. Feeding unit; 131. First feeding unit; 132. Second feeding unit;

[0043] 20. pulping device; 21. pulping body; 211. pulping cylinder; 21101. feed chamber; 21102. mixing chamber; 21103. feed port; 21104. water inlet; 212. material balancing plate group; 2121. first material balancing plate; 212101. first material through hole; 2122. second material balancing plate; 212201. second material through hole; 22. balancing member; 23. mixing member; 24. atomizing head;

[0044] 30. Piezoelectric lithium extraction device; 31. Screening mechanism; 311. Main body; 31101. Underscreen cavity; 31102. Overscreen cavity; 31103. Flow channel; 312. Screening component; 3121. Screen frame; 312101. Frame groove; 3122. Screening assembly; 31221. Screening net; 31222. Piezoelectric screen; 312221. Net body; 312222. First piezoelectric coating; 313. Vibrator; 32. Piezoelectric stirring lithium extraction mechanism; 321. Stirring shell; 32 11. stirring body; 321101. inlet; 321102. outlet; 3212. separator; 321201. discharge trough; 32101. stirring chamber; 322. piezoelectric stirring member; 3221. stirring shaft group; 32211. main shaft; 32212. pillar; 3222. piezoelectric stirring member; 32221. inner roller; 32222. second piezoelectric coating; 3223. scraper; 33. separation mechanism; 331. first separation member; 332. second separation member;

[0045] 40. Collection device; 41. Lithium liquid collection box; 42. Pole powder collection component; 421. Pole powder collection box; 422. Pole powder conveying assembly; 43. Copper and aluminum collection component; 431. Copper and aluminum collection box; 432. Copper and aluminum conveying assembly;

[0046] 50. Slurry pump group; 51. First slurry pump; 52. Second slurry pump;

[0047] 60. Safety device; 61. Gas detector; 62. Valve. DETAILED DESCRIPTION

[0048] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0049] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0050] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0051] refer to Figure 1 to Figure 2 According to a preferred embodiment of the present invention, a piezoelectric catalytic lithium pre-extraction device will be described in detail below. The piezoelectric catalytic lithium pre-extraction device includes a pre-treatment device 10, and the pre-treatment device 10 includes a crushing mechanism 11 and a separation unit 12. The crushing mechanism 11 includes a crushing unit 111. The crushing unit 111 is configured to crush the waste lithium batteries into a mixture and release volatile organic matter, wherein the mixture includes diaphragm crushes and powder containing copper, aluminum and pole powder. The separation unit 12 is connected to the crushing unit 111, and the mixture and volatile organic matter obtained by crushing the crushing unit 111 are introduced into the separation unit 12. The separation unit 12 is configured to separate part of the powder and the volatile organic matter as a whole, the diaphragm crushes and the remaining part of the powder.

[0052] Preferably, the crushing unit 111 includes a pulverizer 1111, which performs a pulverizing operation to discharge the mixed material and volatile organic matter from its bottom. The bottom of the pulverizer 1111 is connected to the separation unit 12 through a pipeline to supply the separation unit 12.

[0053] The crushing machine group 111 further includes a shredder 1112, which shreds the waste lithium batteries to obtain a mixture and volatile organic matter. The shredder 1112 is adjacent to the pulverizer 1111, and the shredder 1112 can supply the mixture and volatile organic matter to the pulverizer 1111, so that the pulverizer 1111 can further pulverize them. In this process, the waste lithium batteries are pulverized successively to improve the fineness of the pulverization, and compared with using only the pulverizer 1111, the workload of the pulverizer 1111 is reduced.

[0054] The mixed material and volatile organic matter obtained by the shredder 1112 are discharged from the bottom thereof. The pretreatment device 10 further includes a feeder assembly 13, the feeder assembly 13 including a first feeder 131, one end of the first feeder 131 is connected to the bottom of the shredder 1112, and one end of the first feeder 131 away from the shredder 1112 is connected to the top of the pulverizer 1111. The first feeder 131 is configured to convey the mixed material and volatile organic matter obtained by the shredder 1112 to the pulverizer 1111, so as to automatically feed the pulverizer 1111 without manual transfer, and is easy to operate.

[0055] Preferably, the first feeding member 131 is implemented as a screw conveyor.

[0056] As a preferred embodiment of the previous embodiment, the first feeding member 131 implemented as a screw conveyor is arranged at an angle, and the lower end of the first feeding member 131 is connected to the bottom of the shredder 1112, and the upper end of the first feeding member 131 is connected to the top of the pulverizer 1111, so as to reduce the requirements for the spatial arrangement of the pulverizer 1111 and the shredder 1112.

[0057] The feeder assembly 13 further includes a second feeder 132 , one end of which is connected to the top of the shredder 1112 , and the second feeder 132 is configured to drive the waste lithium batteries to move toward the shredder 1112 to automatically feed the shredder 1112 .

[0058] Preferably, the second feeding member 132 is implemented as a screw conveyor.

[0059] As a preferred embodiment of the previous embodiment, the second feeding member 132 implemented as a screw conveyor is tilted, and the upper end of the second feeding member 132 is connected to the top of the shredder 1112, and the lower end of the second feeding member 132 is maintained at a predetermined height to facilitate staff to feed.

[0060] The separation unit 12 includes a collector 121, a dust removal component 122 and a screening component 123. The bottom of the pulverizer 1111 is connected to the top of the collector 121 through a pipeline, and the mixed material and volatile organic matter produced by the pulverizer 1111 are introduced into the collector 121. The dust removal component 122 is connected to the top of the collector 121 through a pipeline, and the dust removal component 122 is used to absorb part of the powder and volatile organic matter in the mixed material in the collector 121. The screening component 123 is installed at the bottom of the collector 121, and is used to screen the remaining mixed material to separate the diaphragm crushed material and the powder, and the separated powder is discharged from the bottom of the screening component 123.

[0061] Preferably, the dust removal element 122 is implemented as a pulse dust collector.

[0062] Preferably, the screening element 123 is implemented as a linear screen.

[0063] The crushing mechanism 11 also includes a grinder 112, the top of which is connected to the bottom of the screening element 123 and the dust removal element 122 through pipelines, and the powder sieved by the screening element 123 and the powder sucked away by the dust removal element 122 are introduced into the grinder 112. The grinder 112 is used to grind the powder to further reduce the particle size of the powder to facilitate subsequent pulping.

[0064] refer to Figures 1 to 4 The piezoelectric catalytic lithium pre-extraction equipment also includes a pulping device 20. The top of the pulping device 20 is connected to the pretreatment device 10 through a pipeline. The powder obtained by the pretreatment device 10 is introduced into the pulping device 20. The pulping device 20 is configured to mix the powder with water to obtain a mixed slurry to meet the solid-liquid ratio required for piezoelectric lithium extraction.

[0065] Preferably, the top end of the pulping device 20 is connected to the bottom end of the grinder 112 through a pipeline, and the powder ground by the grinder 112 is discharged from the bottom end thereof and enters the pulping device 20 through the pipeline.

[0066] refer to Figure 3 to Figure 4The pulping device 20 includes a pulping body 21, and the pulping body 21 includes a pulping cylinder 211 and a material distribution plate group 212. The pulping cylinder 211 has a feed chamber 21101 and a mixing chamber 21102 located at the bottom of the feed chamber 21101 and connected to the feed chamber 21101. The top of the pulping cylinder 211 also forms a feed port 21103 connected to the feed chamber 21101. The feed port 21103 is connected to the grinder 112 of the pretreatment device 10 through a pipeline. The feed port 21103 is used to introduce powder into the feed chamber 21101. The pulping cylinder 211 also has at least one water inlet 21104 connected to the feed chamber 21101, and the water inlet 21104 is used to supply water to the feed chamber 21101. The material balancing plate group 212 includes at least one first material balancing plate 2121 and at least one second material balancing plate 2122, and the at least one first material balancing plate 2121 and the at least one second material balancing plate 2122 are arranged in the mixing chamber 21102 along the vertical interval. In the direction of the side wall extending from the center of the mixing chamber 21102 to the pulping cylinder 211 to form the mixing chamber 21102, the distance between the upper surface of the first material balancing plate 2121 and a horizontal plane located below it gradually decreases, and the distance between the upper surface of the second material balancing plate 2122 and a horizontal plane located below it gradually increases. Among the first material balancing plates 2121 and the second material balancing plates 2122 arranged along the vertical interval, the first material balancing plate 2121 is located at the uppermost layer, and the second material balancing plate 2122 is located at the lowermost layer. The first material equalizing plate 2121 forms a plurality of first material passing holes 212101 at a position close to the peripheral wall of the pulping cylinder 211, and the plurality of first material passing holes 212101 all correspond to the edge of the second material equalizing plate 2122 located therebelow, and the slurry located above the first material equalizing plate 2121 flows downward through the first material passing holes 212101 to flow to the edge of the second material equalizing plate 2122 located therebelow, and the second material equalizing plate 2122 forms a second material passing hole 212201 which is coaxial with the pulping cylinder 211 and corresponds to the center of the first material equalizing plate 2121, and the slurry located above the second material equalizing plate 2122 flows downward through the second material passing holes 212201 to flow to the center of the first material equalizing plate 2121 located therebelow or to the outside of the pulping cylinder 211. After the slurry composed of the powder introduced by the feed port 21103 and the water introduced by the water inlet 21104 is introduced from the feed chamber 21101 into the mixing chamber 21102, the slurry flows in sequence to the top of at least one of the first equalizing plates 2121 and at least one of the second equalizing plates 2122 arranged at intervals, the slurry first flows to the center of the first equalizing plate 2121 and flows to its edge under the action of gravity for mixing, and the slurry first flows to the edge of the second equalizing plate 2122 and flows to its center under the action of gravity for mixing.The second material passage hole 212201 of the second material equalizing plate 2122 located at the bottom layer is used to discharge the mixed slurry in the mixing chamber 21102.

[0067] In this way, the mixing operation is repeated by utilizing the upper surfaces of the first material equalizing plate 2121 and the second material equalizing plate 2122 to guide the slurry and the fluidity and gravity of the slurry, so as to ensure that the slurry finally passing through the second material hole 212201 of the second material equalizing plate 2122 located at the bottom layer is evenly mixed. Compared with the existing stirring type mixer, it does not require power, is energy-saving and environmentally friendly, has low operating costs, and does not require shutdown. It can meet large-scale continuous feeding and realize continuous mixing. It has good mixing effect and higher efficiency.

[0068] Preferably, three of the first material balancing plates 2121 and the second material balancing plates 2122 are provided. In this way, the slurry entering the mixing chamber 21102 from the feeding chamber 21101 is mixed six times in succession, so that the mixing effect of the slurry after the final mixing is guaranteed.

[0069] Preferably, the cross-sectional area of ​​the second material passing hole 212201 gradually decreases from top to bottom to guide the slurry, so that the slurry can be concentrated and guided to the center of the first material equalizing plate 2121 arranged below the corresponding second material equalizing plate 2122, and it is also conducive to the centralized discharge of the slurry after mixing.

[0070] refer to Figure 4 The pulping device 20 further includes an equalizing member 22, which is installed above the first equalizing plate 2121 located at the top layer and located at the center of the first equalizing plate 2121, and the equalizing member 22 corresponds to the feed chamber 21101. The top of the equalizing member 22 is open and can accommodate slurry, and the slurry that moves through the feed chamber 21101 and flows to the mixing chamber 21102 is first gathered in the equalizing member 22. When the slurry in the equalizing member 22 reaches its maximum capacity, the slurry overflows from the top of the equalizing member 22 and overflows downward along its peripheral wall to flow to the top of the first equalizing plate 2121 located at the top layer. In this process, the equalizing member 22 plays a distribution role in the flow of the slurry, so as to ensure that the slurry falling on the surface of the first equalizing plate 2121 located at the top layer is evenly distributed near its center, so as to prevent the slurry from affecting the mixing effect due to uneven distribution of the slurry in the process of flowing to its edge. In addition, the slurry is temporarily gathered in the evenly distributing member 22, which is beneficial to mixing, and the slurry in the evenly distributing member 22 is impacted by the slurry that continuously flows into the evenly distributing member 22, so as to accelerate mixing.

[0071] refer to Figure 4The pulping device 20 further includes at least one mixing element 23, which is installed in the feed chamber 21101. The mixing element 23 extends downward from one side wall of the feed chamber 21101 and has a gap with the other opposite side wall of the feed chamber 21101. The mixing element 23 is located on the flow path of the powder introduced into the feed chamber 21101 from the feed port 21103. The powder passing through the feed port 21103 hits the mixing element 23 and is dispersed, so that the powder can fully contact with water.

[0072] Preferably, the water flowing through at least one of the water inlets 21104 is sprayed toward the upper surface of the mixing piece 23, so that the slurry formed by the contact between the powder and the water is preliminarily mixed on the upper surface of the mixing piece 23, and the blocking effect of the mixing piece 23 on the powder is utilized to increase the contact time between the powder and the water and enhance the mixing effect.

[0073] Preferably, two mixing pieces 23 are provided, the two mixing pieces 23 are arranged opposite to each other and spaced apart by a predetermined height, and two water inlets 21104 are provided, and the water flowing through the two water inlets 21104 is sprayed onto the upper surfaces of the two mixing pieces 23 respectively, so that the powder and water are repeatedly mixed on the upper surfaces of the two mixing pieces 23, thereby improving the mixing effect.

[0074] refer to Figure 4 The pulping device 20 also includes at least one atomizing head 24, which is installed in the feed chamber 21101 and each of the atomizing heads 24 corresponds to a water inlet 21104. The atomizing head 24 is configured to atomize water passing through the water inlet 21104 to increase the contact degree between the powder and the water, which is beneficial to mixing.

[0075] It is worth mentioning that after crushing, the particle sizes of copper-aluminum materials and pole powder in the powder are quite different. In order to prevent the presence of copper-aluminum materials from increasing the processing volume and affecting the processing efficiency, screening is usually required. If the copper-aluminum materials are screened first and then pulped, the screened copper-aluminum materials will inevitably be mixed with pole powder, and lithium exists in the pole powder, which is not conducive to the full extraction of lithium. Therefore, it is necessary to make pulp first and then screen to obtain copper-aluminum material and pole powder slurry, and then process the copper-aluminum material and pole powder slurry separately to fully extract lithium while improving the lithium extraction efficiency.

[0076] refer to Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7The piezoelectric catalytic lithium pre-extraction equipment also includes a piezoelectric lithium extraction device 30, and the piezoelectric lithium extraction device 30 includes a screening mechanism 31. The screening mechanism 31 is connected to the pulping device 20 through a pipeline, and the mixed slurry produced by the pulping device 20 flows to the screening mechanism 31. The screening mechanism 31 is configured to screen the mixed slurry to obtain copper-aluminum-doped slurry and pole powder slurry.

[0077] refer to Figures 5 and 6 The screening mechanism 31 includes a main body 311, a screening component 312 and at least one exciter 313. The screening component 312 includes a screen frame 3121 and at least one screening component 3122. The screen frame 3121 is movably mounted on the main body 311. The screen frame 3121 has a frame groove 312101. The screening component 3122 is inclined. The screening component 3122 is mounted in the frame groove 312101 and has a spacing with the bottom wall of the screen frame 3121. The mixed slurry discharged from the second material hole 212201 of the second material balancing plate 2122 located at the bottom layer flows to the high end of the screening component 3122 through a pipeline. The exciter 313 is mounted on the screen frame 3121. The screen frame 3121 can be driven by the exciter 313 to vibrate and drive the screening component 3122 to move together. After mixing, the slurry is screened through the screening component 3122 to separate the copper-aluminum slurry and the extreme powder slurry, wherein the copper-aluminum slurry is located above the screening component 3122, and the extreme powder slurry passes through the screening component 3122 and flows to the bottom of the screen frame 3121.

[0078] Preferably, the bottom wall of the frame groove 312101 is inclined and the inclination direction is the same as the inclination direction of the screening assembly 3122. The main body 311 has a screen-under material cavity 31101 and a screen-over material cavity 31102. The bottom end of each frame groove 312101 is connected to the screen-under material cavity 31101, so that the powder slurry in the frame groove 312101 can flow along the bottom wall of the frame groove 312101 under its own gravity and enter the screen-under material cavity 31101. The screen-over material cavity 31102 corresponds to the lower end of the screening assembly 3122. The copper-aluminum slurry on the upper surface of the screening assembly 3122 moves from the upper end of the screening assembly 3122 to its lower end under the vibration of the screening assembly 3122 and finally vibrates away from the screening assembly 3122 and falls into the screen-over material cavity 31102.

[0079] Preferably, the screening assembly 3122 is inclined and the angle between it and the horizontal plane is greater than 30°.

[0080] Preferably, the vibrator 313 can generate high-frequency, low-amplitude vibrations of 1500-7200 times per minute, driving the screening component 3122 to generate reciprocating linear vibrations with a frequency higher than 40 Hz and an amplitude of 0.8 mm-2.0 mm.

[0081] refer to Figure 6 to Figure 7 Preferably, the screening component 3122 includes at least one screening net 31221 and a piezoelectric screen 31222, the piezoelectric screen 31222 includes a mesh body 312221 and a first piezoelectric coating 312222 formed on the surface of the mesh body 312221, the mesh body 312221 and the screening net 31221 are stacked in the frame groove 312101 and can vibrate together with the screen frame 3121. The upper sieve cavity 31102 corresponds to the lower end of the screening net 31221. During the vibration of the screening component 3122, at least part of the copper and aluminum materials in the mixed slurry are intercepted by the screening mesh 31221 and form a copper-aluminum-doped slurry with part of the slurry. The copper-aluminum-doped slurry moves from the upper end of the screening mesh 31221 to the lower end thereof under the vibration action of the corresponding screening mesh 31221 and falls into the upper material cavity 31102. The pole powder slurry in the mixed slurry passes through the screening mesh 31221 and the piezoelectric screening mesh 31222 and under the vibration action of the piezoelectric screening mesh 31222, the pole powder in the pole powder slurry rubs against water, against each other, and against the first piezoelectric coating 312222, so as to leach at least part of the lithium in the pole powder into the water for subsequent lithium extraction.

[0082] Preferably, the manufacturing method of the first piezoelectric coating 312222 includes but is not limited to magnetron sputtering, precipitation, brushing, thermoplasticity and adhesive method, and the first piezoelectric coating 312222 is implemented as one or more materials of bismuth ferrite, polytetrafluoroethylene (PTFE), quartz, barium titanate, lead zirconate titanate (PZT), polyvinylidene fluoride (PVDF), polymer piezoelectric film, lithium niobate, lead zirconate, perovskite material, sodium polyacrylate, and polylactic acid (PLA).

[0083] Preferably, each screening assembly 3122 is provided with two screening meshes 31221, and the piezoelectric screen 31222 is provided between the two screening meshes 31221. The aperture of the screening mesh 31221 located at the bottom of the piezoelectric screen 31222 is smaller than the aperture of the screening mesh 31221 located at the top of the piezoelectric screen 31222, so as to achieve a double screening effect, thereby improving the separation effect.

[0084] Preferably, the screen frame 3121 is connected to the main body 311 via a spring so that the screen frame 3121 is in a floating state to facilitate the vibration action.

[0085] Preferably, the screening components 3122 are provided in multiple groups, and the multiple groups of the screening components 3122 are arranged at intervals, and the multiple groups of the screening components 3122 simultaneously process the mixed slurry discharged from the second material passing hole 212201 of the second material equalizing plate 2122 located at the bottom layer to improve the screening efficiency.

[0086] Preferably, multiple groups of the screening components 3122 are stacked vertically to reduce the lateral space occupied.

[0087] refer to Figure 6 The main body 311 also has at least one flow channel 31103, the top of each flow channel 31103 is connected to the second material through hole 212201 of the second material equalizing plate 2122 located at the bottom layer through a pipeline, and the bottom end of each flow channel 31103 corresponds to the high end of a screening component 3122 and is located on the upper surface of the corresponding screening component 3122, so that the mixed slurry can flow through the flow channel 31103 and then flow to the screening component 3122 after being discharged from the second material through hole 212201 of the second material equalizing plate 2122 located at the bottom layer, so as to supply material to the screening component 3122.

[0088] Preferably, when there are multiple screening assemblies 3122, the number of the flow channels 31103 is consistent with the number of the screening assemblies 3122. In this way, the mixed slurry discharged from the second material holes 212201 of the second material balancing plate 2122 located at the bottom layer can be divided into multiple streams and flow to the multiple screening assemblies 3122 respectively, so as to feed the multiple screening assemblies 3122 respectively.

[0089] refer to Figure 1 , Figure 2 , Figure 8 , Fig. 9 and Fig.10 The piezoelectric lithium extraction device 30 also includes a piezoelectric stirring lithium extraction mechanism 32, which is connected to the screening mechanism 31. The pole powder slurry separated by the screening mechanism 31 can be introduced into the piezoelectric stirring lithium extraction mechanism 32, and the piezoelectric stirring lithium extraction mechanism 32 is configured to perform piezoelectric stirring on the pole powder slurry to form a lithium extraction slurry.

[0090] refer to Fig. 9The piezoelectric stirring lithium extraction mechanism 32 includes a stirring shell 321, and the stirring shell 321 includes a stirring body 3211 and a plurality of partitions 3212. The plurality of partitions 3212 are stacked in the stirring body 3211 at a predetermined vertical distance and divide the internal space of the stirring body 3211 into a plurality of stirring chambers 32101. Each of the partitions 3212 forms a discharge trough 321201 that passes through from top to bottom, and the discharge trough 321201 of each of the partitions 3212 connects two adjacent stirring chambers 32101. The stirring body 3211 has at least one inlet 321101 and one outlet 321102, the inlet 321101 is connected to the stirring chamber 32101 located at the uppermost layer, and the inlet 321101 is connected to the under-sieve cavity 31101 through a pipeline, the pole powder slurry discharged from the under-sieve cavity 31101 enters the stirring body 3211 through the inlet 321101, the outlet 321102 is connected to the stirring chamber 32101 located at the lowermost layer, the outlet 321102 corresponds to the discharge trough 321201 of the separator 3212 located at the lowermost layer, and the outlet 321102 is used to discharge the lithium extraction slurry obtained by multiple lithium leaching.

[0091] Preferably, a plurality of the inlet ports 321101 are provided, and the plurality of inlet ports 321101 are evenly spaced and distributed around the stirring body 3211 to ensure uniform feeding.

[0092] refer to Figures 9 and 10The piezoelectric stirring lithium extraction mechanism 32 also includes a piezoelectric stirring member 322, which includes a stirring shaft group 3221, multiple groups of piezoelectric stirring elements 3222 and multiple scraping elements 3223. The stirring shaft group 3221 is plugged into the stirring body 3211, and multiple groups of piezoelectric stirring elements 3222 and multiple scraping elements 3223 are arranged on the peripheral side of the stirring shaft group 3221 and connected to the stirring shaft group 3221. The stirring shaft group 3221 can be driven to rotate to drive all the piezoelectric stirring elements 3222 and the scraping elements 3223 to make circular motion around the axis of the stirring shaft group 3221. The number of groups of the piezoelectric stirring elements 3222 and the number of the scraping elements 3223 match the number of the stirring chambers 32101, and each stirring chamber 32101 is provided with a group of the piezoelectric stirring elements 3222 and a scraping element 3223. The stirring shaft group 3221 can be driven to rotate to drive all the piezoelectric stirring elements 3222 and the scraping element 3223 to rotate synchronously. Each piezoelectric stirring element 3222 includes an inner roller 32221 and a second piezoelectric coating 32222 formed on the outer surface of the inner roller 32221, and the inner roller 32221 is connected to the stirring shaft group 3221.

[0093] When the multiple groups of piezoelectric stirring members 3222 are driven to rotate, the piezoelectric stirring members 3222 in the stirring chamber 32101 at the top stir the pole powder slurry so that the pole powder in the pole powder slurry rubs with water, the pole powder rubs with the pole powder, and the pole powder rubs with the second piezoelectric coating 32222 to leach at least part of the lithium, and each of the scraping members 3223 can be driven by the stirring shaft group 3221 to rotate to scrape the pole powder slurry in the corresponding stirring chamber 32101 to the discharge trough 321201 to be discharged from the discharge trough 321201, and the piezoelectric stirring members 3222 in the stirring chamber 32101 at the lower layer stir the pole powder slurry discharged from the stirring chamber 32101 at the upper layer to further leach lithium, so as to leach the lithium in the pole powder into the water as much as possible. In this process, the pole powder slurry is subjected to multiple piezoelectric stirrings, so that the lithium in the pole powder is fully leached for subsequent lithium extraction.

[0094] Preferably, the manufacturing method of the second piezoelectric coating 32222 includes but is not limited to magnetron sputtering, precipitation, brushing, thermoplasticity and adhesive method, and the second piezoelectric coating 32222 is implemented as one or more materials of bismuth ferrite, polytetrafluoroethylene (PTFE), quartz, barium titanate, lead zirconate titanate (PZT), polyvinylidene fluoride (PVDF), polymer piezoelectric film, lithium niobate, lead zirconate, perovskite material, sodium polyacrylate, polylactic acid (PLA).

[0095] In one embodiment, the inner roller 32221 and the second piezoelectric coating 32222 are made of the same material, and the inner roller 32221 and the second piezoelectric coating 32222 are integrally formed.

[0096] In another embodiment, the surface of the inner roller 32221 is coated with piezoelectric material to form the second piezoelectric coating 32222 .

[0097] refer to Fig. 9 It is worth mentioning that the stirring shaft group 3221 includes a main shaft 32211 and multiple groups of pillars 32212. The multiple groups of pillars 32212 are arranged in the radial direction of the main shaft 32211 at a predetermined interval in the vertical direction, and each stirring chamber 32101 is provided with a group of pillars 32212. The number of the piezoelectric stirring elements 3222 is consistent with the number of the pillars 32212. Each of the inner rollers 32221 is rotatably sleeved on a pillar 32212. The main shaft 32211 can be driven to rotate to drive all the inner rollers 32221 and the pillars 32212 to make circular motion around the axis of the main shaft 32211. During the process of the piezoelectric stirring element 3222 stirring the pole powder slurry, the piezoelectric stirring element 3222 rotates due to friction with the pole powder slurry in the corresponding stirring chamber 32101 to drive the pole powder slurry located near the main shaft 32211 to move, so as to prevent part of the pole powder slurry from gathering on the side around the main shaft 32211, thereby ensuring that the pole powder slurry in the stirring chamber 32101 can be effectively piezoelectrically stirred, thereby improving the reaction degree of the pole powder slurry.

[0098] Preferably, each group of the piezoelectric stirring elements 3222 is provided with a plurality of piezoelectric stirring elements 3222, and the plurality of piezoelectric stirring elements 3222 are evenly spaced, wherein a scraper 3223 is provided between two piezoelectric stirring elements 3222. In this way, through the coordinated cooperation of the plurality of piezoelectric stirring elements 3222 in each group, the reaction degree of the pole powder slurry is improved for subsequent lithium extraction.

[0099] Preferably, the bottom wall of the stirring body 3211 gradually extends downward from the edge to the center to guide the discharge of lithium extraction slurry obtained by multiple lithium leaching in the stirring chamber 32101 located at the bottom layer.

[0100] refer to Figure 1 to Figure 2 The piezoelectric lithium extraction device 30 also includes a separation mechanism 33, and the separation mechanism 33 includes a first separation component 331. The first separation component 331 is connected to the outlet 321102 of the piezoelectric stirring lithium extraction mechanism 32. The lithium extraction slurry generated by the piezoelectric stirring lithium extraction mechanism 32 is introduced into the first separation component 331. The first separation component 331 is configured to perform solid-liquid separation on the lithium extraction slurry to obtain lithium-free pole powder and lithium liquid.

[0101] Preferably, the first separation member 331 is implemented as a scraper centrifuge, and the lithium extraction slurry can be driven by the scraper centrifuge to rotate so as to separate the lithium-free electrode powder and the lithium liquid under the action of centrifugal force.

[0102] Preferably, when the first separation member 331 is implemented as a scraper centrifuge, a piezoelectric coating is formed on the scraper surface of the scraper centrifuge, so that when the lithium extraction slurry is driven and rotated by the scraper centrifuge, the pole powder in the lithium extraction slurry rubs against water, the pole powder rubs against the pole powder, and the pole powder rubs against the piezoelectric coating, so as to leach lithium as much as possible, reduce the lithium content in the lithium extraction pole powder as much as possible, and improve the lithium extraction rate.

[0103] The separation mechanism 33 includes a second separation component 332, which is connected to the above-screen material chamber 31102 of the screening mechanism 31 through a pipeline. The copper-aluminum slurry obtained by separation by the screening mechanism 31 is introduced into the second separation component 332. The second separation component 332 is configured to perform solid-liquid separation on the copper-aluminum slurry to obtain copper-aluminum material and pole powder slurry.

[0104] Preferably, the second separation member 332 is implemented as a scraper centrifuge, and the copper-aluminum material in the slurry can be driven by the scraper centrifuge to rotate so as to separate the copper-aluminum material and the ultrafine powder slurry under the action of centrifugal force.

[0105] Preferably, when the second separation member 332 is implemented as a scraper centrifuge, a piezoelectric coating is formed on the scraper surface of the scraper centrifuge, so that when the copper-aluminum material doped with slurry is driven by the scraper centrifuge to rotate, the pole powder in the slurry rubs against water, the pole powder rubs against the pole powder, and the pole powder rubs against the piezoelectric coating, so as to leach the lithium in the pole powder into the water as much as possible.

[0106] It is worth noting that the second separation member 332 is connected to at least one of the introduction ports 321101 , and the pole powder slurry separated by the second separation member 332 is introduced into the stirring body 3211 through the introduction port 321101 to recover the pole powder slurry.

[0107] In this way, under the cooperation of the screening mechanism 31, the piezoelectric stirring lithium extraction mechanism 32 and the separation mechanism 33, the mixed slurry obtained by mixing the powder after pretreatment of the waste lithium battery with water is screened to obtain the pole powder slurry and the copper-aluminum material mixed with the slurry, and the pole powder slurry is piezoelectrically stirred to make the lithium in the pole powder leached into the water as much as possible to obtain the lithium extraction slurry, and then the lithium extraction slurry is separated from the solid to liquid to obtain the lithium liquid and the lithium-free pole powder, so as to realize the pre-extraction of lithium. Compared with the existing acid leaching method for lithium extraction, no reagents are required, and no impurities are removed, the operation is simple, and the equipment cost and processing cost are relatively low. In addition, by performing solid-liquid separation on the copper-aluminum material mixed with the slurry and performing piezoelectric stirring on the separated pole powder slurry, the pole powder is recovered as much as possible, thereby improving the lithium extraction rate.

[0108] In addition, the pole powder slurry is piezoelectrically treated while being screened, and the lithium extraction slurry and the copper-aluminum doped slurry are piezoelectrically treated while undergoing solid-liquid separation. Based on the piezoelectric stirring operation, the lithium leaching rate is maximized to achieve efficient lithium extraction.

[0109] refer to Figure 1 to Figure 2 The piezoelectric catalytic lithium pre-extraction equipment also includes a collecting device 40, and the collecting device 40 includes a lithium liquid collecting box 41. The lithium liquid collecting box 41 is connected to the first separation member 331 through a pipeline, and the lithium liquid separated by the first separation member 331 is introduced into the lithium liquid collecting box 41 to be stored by the lithium liquid collecting box 41.

[0110] The collecting device 40 includes a pole powder collecting component 42 , and the pole powder collecting component 42 includes a pole powder collecting box 421 . The pole powder collecting box 421 is connected to the first separation component 331 , and the lithium-free pole powder separated by the first separation component 331 is introduced into the pole powder collecting box 421 for storage.

[0111] Preferably, the pole powder collecting component 42 also includes a pole powder conveying component 422, and the two ends of the pole powder conveying component 422 correspond to the first separation component 331 and the pole powder collecting box 421 respectively. The lithium-removing pole powder separated by the first separation component 331 is conveyed by the pole powder conveying component 422 and introduced into the pole powder collecting box 421, so that during the conveying process, the lithium-removing pole powder is dried to reduce the water content of the lithium-removing pole powder.

[0112] Preferably, the pole powder conveying assembly 422 is implemented as a belt conveyor.

[0113] The collecting device 40 includes a copper-aluminum collecting component 43, and the copper-aluminum collecting component 43 includes a copper-aluminum collecting box 431. The copper-aluminum collecting box 431 is connected to the second separating component 332, and the copper-aluminum materials separated by the second separating component 332 are introduced into the copper-aluminum collecting box 431 to be stored by the copper-aluminum collecting box 431.

[0114] Preferably, the copper-aluminum collecting component 43 also includes a copper-aluminum conveying component 432, and the two ends of the copper-aluminum conveying component 432 correspond to the second separation component 332 and the copper-aluminum collecting box 431 respectively. The copper-aluminum material separated by the second separation component 332 is conveyed by the copper-aluminum conveying component 432 and introduced into the copper-aluminum collecting box 431, so that during the conveying process, the copper-aluminum material is dried to reduce the water content of the copper-aluminum material.

[0115] Preferably, the copper and aluminum transfer assembly 432 is implemented as a belt conveyor.

[0116] refer to Figure 1 to Figure 2 The piezoelectric catalytic lithium pre-extraction equipment also includes a slurry pump group 50, and the slurry pump group 50 includes a first slurry pump 51. The first slurry pump 51 is installed on the pipeline between the under-screen cavity 31101 and the inlet 321101. The first slurry pump 51 is configured to guide the pole powder slurry separated by the screening mechanism 31 into the stirring body 3211.

[0117] The slurry pump group 50 also includes a second slurry pump 52, which is installed on the pipeline between the inlet 321101 and the second separation member 332, and the second slurry pump 52 is configured to guide the pole powder slurry separated by the second separation member 332 into the stirring body 3211.

[0118] refer to Figure 1 to Figure 2 The piezoelectric catalytic lithium pre-extraction equipment also includes two safety devices 60, the safety device 60 includes a gas detector 61 and a valve 62. The pulverizer 1111 and the shredder 1112 are both equipped with the gas detector 61, and the gas detector 61 is used to detect the concentration of volatile organic matter in the pulverizer 1111 or the shredder 1112. The pulverizer 1111 and the shredder 1112 are both connected to the protective gas supply device through a pipeline, and the valve 62 is installed on the corresponding pipeline. The valve 62 is configured to adjust the flow rate of the protective gas entering the pulverizer 1111 or the shredder 1112.

[0119] Preferably, the gas detector 61 is connected to a controller in communication, and the valve 62 is controllably connected to the controller. The gas detector 61 detects the concentration of volatile organic matter in the crusher 1111 or the shredder 1112 and feeds it back to the controller. If the controller determines that the concentration is too high, the valve 62 is controlled by the controller to increase the opening to increase the flow rate of the protective gas and ensure the safe crushing operation; if the controller determines that the concentration is too low, the valve 62 is controlled by the controller to decrease the opening to save protective gas on the basis of safe crushing.

[0120] Preferably, the protective gas is implemented as one or any combination of nitrogen, carbon dioxide, helium, argon, neon, krypton and xenon.

[0121] The present application also proposes a working method of a piezoelectric catalytic lithium pre-extraction device, comprising the following steps:

[0122] The screening mechanism 31 screens the mixed slurry to separate the copper-aluminum mixed slurry and the ultra-fine powder slurry;

[0123] The pole powder slurry separated by the screening mechanism 31 is introduced into the stirring chamber 32101 located at the uppermost layer from the inlet 321101 of the stirring body 3211, and the piezoelectric stirring member 3222 in the stirring chamber 32101 located at the uppermost layer is driven by the stirring shaft group 3221 to rotate to stir the pole powder slurry in the corresponding stirring chamber 32101, so that the pole powder in the pole powder slurry rubs with water, the pole powder rubs with the pole powder, and the pole powder rubs with the second piezoelectric coating 32222 to leach at least part of the lithium, and at the same time, the scraping member 3223 in the corresponding stirring chamber 32101 is driven by the stirring shaft group 3221 to rotate to scrape the pole powder slurry to the discharge trough 321201 so as to be discharged from the discharge trough 321201 to the next stirring chamber 32101, so as to perform piezoelectric stirring operations for multiple times, and finally the lithium extraction slurry obtained by multiple lithium leaching is discharged from the outlet 321102;

[0124] The copper-aluminum material in the slurry separated by the screening mechanism 31 is introduced into the second separation component 332. The second separation component 332 performs solid-liquid separation on the copper-aluminum material in the slurry to obtain copper-aluminum material and pole powder slurry. The pole powder slurry separated by the second separation component 332 is introduced into the stirring body 3211 through the inlet 321101 to recover the pole powder as much as possible and improve the extraction rate of lithium.

[0125] Preferably, the working method of the piezoelectric catalytic lithium pre-extraction equipment comprises the following steps: the lithium extraction slurry discharged from the outlet 321102 is introduced into the first separation component 331, and the first separation component 331 performs solid-liquid separation on the lithium extraction slurry to obtain lithium-free electrode powder and lithium liquid.

[0126] Preferably, the working method of the piezoelectric catalytic lithium pre-extraction equipment comprises the following steps: in the process of the piezoelectric stirring element 3222 stirring the pole powder slurry, the piezoelectric stirring element 3222 rubs against the pole powder slurry in the corresponding stirring chamber 32101 and rotates to drive the pole powder slurry located near the main shaft 32211 to move.

[0127] Preferably, the working method of the piezoelectric catalytic lithium pre-extraction device comprises the following steps:

[0128] The powder obtained by pretreatment of the waste lithium batteries is introduced into the feed chamber 21101 through the feed port 21103, and water is supplied to the feed chamber 21101 through the water inlet 21104, so that the slurry composed of the powder and water is introduced from the feed chamber 21101 into the mixing chamber 21102, and the slurry flows to the center of the first material equalizing plate 2121 located on the uppermost layer and flows toward its edge under the action of gravity so as to flow through the first material passing hole 212101 to the edge of the second material equalizing plate 2122 located below it, and the slurry flows from the corresponding edge of the second material equalizing plate 2122 to its center under the action of its own gravity and is discharged from the second material passing hole 212201, and mixing is continuously performed in sequence, and finally the mixed slurry is discharged from the second material passing hole 212201 of the second material equalizing plate 2122 located on the lowermost layer.

[0129] Preferably, the working method of the piezoelectric catalytic lithium pre-extraction equipment includes the following steps: the slurry that moves through the feed chamber 21101 and flows to the mixing chamber 21102 is first gathered in the equalizing member 22, so that when the slurry in the equalizing member 22 reaches its maximum holding capacity, the slurry overflows from the top of the equalizing member 22 and overflows downward along its peripheral wall to flow to above the first equalizing plate 2121 located on the uppermost layer, thereby distributing the slurry.

[0130] Preferably, the working method of the piezoelectric catalytic lithium pre-extraction equipment includes the following steps: the powder passing through the feed port 21103 collides with the mixing piece 23 and is broken up, and the water flowing through the water inlet 21104 is sprayed toward the corresponding upper surface of the mixing piece 23, so that the slurry formed by the contact between the powder and the water is preliminarily mixed on the upper surface of the mixing piece 23.

[0131] Preferably, the working method of the piezoelectric catalytic lithium pre-extraction device comprises the following steps: the atomizing head 24 atomizes the water passing through the water inlet 21104 to increase the contact degree between the powder and the water.

[0132] Preferably, the working method of the piezoelectric catalytic lithium pre-extraction device comprises the following steps:

[0133] The crushing unit 111 crushes the waste lithium batteries into a mixture to release volatile organic matter. The mixture and volatile organic matter obtained by the crushing unit 111 are introduced into the separation unit 12. The separation unit 12 separates part of the powder and the volatile organic matter as a whole, the diaphragm fragments and the remaining powder. The separated powder is introduced into the grinder 112 to be further ground by the grinder 112.

[0134] Preferably, the working method of the piezoelectric catalytic lithium pre-extraction device comprises the following steps:

[0135] The mixed slurry is led to the upper end of the screening component 3122, the vibrator 313 is operated to drive the screen frame 3121 to vibrate, and the screening component 3122 and the screen frame 3121 vibrate together to screen the mixed slurry to separate the copper-aluminum material and the powder slurry;

[0136] The powder slurry passes through the screening assembly 3122 and flows to the bottom of the screen frame 3121, and flows along the bottom wall of the frame groove 312101 under its own gravity and enters the under-screen cavity 31101, and then is transferred from the under-screen cavity 31101 to the stirring body 3211;

[0137] The copper-aluminum slurry is located above the screening component 3122 and moves from its high end to its low end under the vibration of the screening component 3122 and finally vibrates away from the screening component 3122 and falls into the upper material chamber 31102, and then is transferred from the upper material chamber 31102 to the second separation member 332.

[0138] Preferably, the working method of the piezoelectric catalytic lithium pre-extraction equipment comprises the following steps: during the vibration of the screening component 3122, at least part of the copper and aluminum materials in the mixed slurry are intercepted by the screening mesh 31221 and form a copper-aluminum mixed slurry with part of the slurry; the copper-aluminum mixed slurry moves from the high end of the screening mesh 31221 to the low end thereof under the vibration action of the corresponding screening mesh 31221 and falls into the above-screen material cavity 31102; the pole powder slurry in the mixed slurry passes through the screening mesh 31221 and the piezoelectric screening mesh 31222 and under the vibration action of the piezoelectric screening mesh 31222, the pole powder in the pole powder slurry rubs against water, against each other, and against the first piezoelectric coating 312222 to separate at least part of the lithium in the pole powder into water for subsequent lithium extraction.

[0139] Preferably, the working method of the piezoelectric catalytic lithium pre-extraction equipment comprises the following steps: the first separation member 331 is implemented as a scraper centrifuge, and in the process of the lithium extraction slurry being driven and rotated by the scraper centrifuge, the pole powder in the lithium extraction slurry rubs against water, the pole powder rubs against the pole powder, and the pole powder rubs against the piezoelectric coating formed on the scraper surface of the scraper centrifuge, so as to leach lithium as much as possible, and the lithium extraction slurry is separated into lithium-free pole powder and lithium liquid under the action of centrifugal force.

[0140] Preferably, the working method of the piezoelectric catalytic lithium pre-extraction equipment comprises the following steps: the second separation member 332 is implemented as a scraper centrifuge, and in the process of the copper-aluminum material in the slurry being driven by the scraper centrifuge to rotate, the pole powder in the slurry rubs against the water, the pole powder rubs against the pole powder, and the pole powder rubs against the piezoelectric coating, so as to leach the lithium in the pole powder into the water as much as possible, and the copper-aluminum material in the slurry is separated into the copper-aluminum material and the pole powder slurry under the action of centrifugal force.

[0141] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The advantages of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. Piezoelectric catalytic lithium pre-extraction equipment, characterized in that: The piezoelectric catalytic lithium pre-extraction equipment comprises a piezoelectric lithium extraction device, and the piezoelectric lithium extraction device comprises: A sieving mechanism, wherein the sieving mechanism is configured to sieve a mixed slurry formed by mixing the powder obtained after pretreatment of the waste lithium battery with water to obtain a slurry containing copper and aluminum materials and a pole powder slurry; Piezoelectric stirring lithium extraction mechanism, the piezoelectric stirring lithium extraction mechanism comprises: A stirring shell, the stirring shell comprising a stirring body and a plurality of partitions, the plurality of partitions being stacked in the stirring body in a manner of being spaced a predetermined distance vertically and dividing the internal space of the stirring body into a plurality of stirring chambers, each of the partitions forming a discharge trough penetrating from top to bottom, the discharge trough of each of the partitions connecting two adjacent stirring chambers, the stirring body having at least one inlet and outlet, the inlet being connected to the stirring chamber located at the uppermost layer, and the inlet being connected to the screening mechanism through a pipeline, the extreme powder slurry separated by the screening mechanism entering the stirring body through the inlet, and the outlet being connected to the stirring chamber located at the lowermost layer; The piezoelectric stirring component comprises a stirring shaft group, a plurality of piezoelectric stirring elements and a plurality of scraping elements, the stirring shaft group is inserted into the stirring body, the plurality of piezoelectric stirring elements and the plurality of scraping elements are arranged on the peripheral side of the stirring shaft group and connected to the stirring shaft group, the stirring shaft group can be driven to rotate to drive all the piezoelectric stirring elements and the scraping elements to make circular motion around the axis of the stirring shaft group, a group of piezoelectric stirring elements and a scraping element are arranged in each stirring chamber, each piezoelectric stirring element comprises an inner roller and a second piezoelectric coating formed on the outer surface of the inner roller, the inner roller is connected to the stirring shaft group, and in the plurality of groups of piezoelectric stirring elements When driven to rotate, the piezoelectric stirring element in the stirring chamber at the uppermost layer stirs the pole powder slurry so that the pole powder in the pole powder slurry rubs against water, the pole powder rubs against the pole powder, and the pole powder rubs against the second piezoelectric coating to leach at least part of the lithium. Each of the scraping elements can be driven by the stirring shaft group to rotate so as to scrape the pole powder slurry in the corresponding stirring chamber to the discharge trough for discharge from the discharge trough. The piezoelectric stirring element in the stirring chamber at the lower layer stirs the pole powder slurry discharged from the stirring chamber at the upper layer to further leach lithium. The outlet corresponds to the discharge trough of the separator at the lower layer, and the outlet is used to discharge the lithium extraction slurry obtained by multiple lithium leaching. A separation mechanism, the separation mechanism comprising: a second separation member, the second separation member is connected to the screening mechanism through a pipeline, the copper-aluminum slurry obtained by the screening mechanism is introduced into the second separation member, the second separation member is configured to perform solid-liquid separation on the copper-aluminum slurry to obtain the copper-aluminum slurry and the ultraviolet powder slurry, the second separation member is connected to at least one of the introduction ports, and the ultraviolet powder slurry separated by the second separation member is introduced into the stirring body through the introduction port; The second piezoelectric coating is manufactured by any one of magnetron sputtering, precipitation, brushing, thermoplasticity and adhesive methods, and the second piezoelectric coating is implemented as one or more materials selected from bismuth ferrite, polytetrafluoroethylene (PTFE), quartz, barium titanate, lead zirconate titanate (PZT), polyvinylidene fluoride (PVDF), polymer piezoelectric film, lithium niobate, lead zirconate, perovskite-type material, sodium polyacrylate and polylactic acid (PLA).

2. The piezoelectric catalytic lithium pre-extraction device according to claim 1, characterized in that: The stirring shaft group includes a main shaft and multiple groups of pillars, and the multiple groups of pillars are arranged in the radial direction of the main shaft at a predetermined distance along the vertical direction, and a group of pillars is arranged in each stirring chamber, each inner roller is rotatably sleeved on one of the pillars, and the main shaft can be driven to rotate to drive all the inner rollers and the pillars to make circular motion around the axis of the main shaft. In the process of the piezoelectric stirring element stirring the pole powder slurry, the piezoelectric stirring element rubs against the pole powder slurry in the corresponding stirring chamber and rotates to drive the pole powder slurry located near the main shaft to move.

3. The piezoelectric catalytic lithium pre-extraction device according to claim 1, characterized in that: The screening mechanism includes a main body, a screening component and at least one vibrator, the screening component includes a screen frame and at least one screening component, the screen frame is movably mounted on the main body, the screen frame has a frame groove, the screening component is mounted in the frame groove and has a spacing with the bottom wall of the screen frame, the vibrator is mounted on the screen frame, the screen frame can be driven by the vibrator to vibrate and drive the screening component to move together, the mixed slurry is screened by the screening component to separate the copper-aluminum slurry and the extreme powder slurry, wherein the copper-aluminum slurry is located above the screening component, the extreme powder slurry passes through the screening component and flows to the bottom of the screen frame, the screening component is inclined, and the mixed slurry is guided to flow to the screening component The high end of the component, the bottom wall of the frame groove is inclined and the inclination direction is the same as the inclination direction of the screening component, the main body has an under-screen cavity and an over-screen cavity, the bottom end of each frame groove is connected with the under-screen cavity, the pole powder slurry in the frame groove can flow along the bottom wall of the frame groove under the action of its own gravity and enter the under-screen cavity, the under-screen cavity is connected with the inlet through a pipeline, the over-screen cavity corresponds to the low end of the screening component, the copper and aluminum slurry located on the upper surface of the screening component moves from the high end of the screening component to its low end under the vibration of the screening component and finally vibrates away from the screening component and falls into the over-screen cavity, the second separating member is connected with the over-screen cavity through a pipeline.

4. The piezoelectric catalytic lithium pre-extraction device according to claim 3, characterized in that: The screening assembly includes at least one screening mesh and a piezoelectric screening mesh, the piezoelectric screening mesh includes a mesh body and a first piezoelectric coating formed on the surface of the mesh body, the mesh body and the screening mesh are stacked in the frame groove and can both vibrate together with the screening frame, the screen cavity corresponds to the lower end of the screening mesh, during the vibration of the screening assembly, at least part of the copper and aluminum materials in the mixed slurry are intercepted by the screening mesh and form a copper-aluminum-doped slurry with part of the slurry, and the copper-aluminum-doped slurry moves from the high end of the screening mesh to the lower end thereof under the vibration action of the corresponding screening mesh and falls into the screen cavity, the pole powder slurry in the mixed slurry passes through the screening mesh and the piezoelectric screening mesh, and under the vibration action of the piezoelectric screening mesh, the pole powder in the pole powder slurry rubs against water, the pole powder rubs against the pole powder, and the pole powder rubs against the first piezoelectric coating to leach at least part of the lithium in the pole powder into the water.

5. The piezoelectric catalytic lithium pre-extraction device according to claim 1, characterized in that: The separation mechanism includes a first separation component, which is connected to the outlet. The lithium extraction slurry produced by the piezoelectric stirring lithium extraction mechanism is introduced into the first separation component. The first separation component is configured to perform solid-liquid separation on the lithium extraction slurry to obtain lithium-free pole powder and lithium liquid.

6. The piezoelectric catalytic lithium pre-extraction device according to claim 3 or 4, characterized in that: The piezoelectric catalytic lithium pre-extraction equipment includes a pretreatment device, which includes a crushing mechanism and a separation unit. The crushing mechanism includes a crushing unit, and the crushing unit is configured to crush waste lithium batteries into a mixture and release volatile organic matter, wherein the mixture includes diaphragm crushes and powder containing copper, aluminum and pole powder. The separation unit is connected to the crushing unit, and the mixture and volatile organic matter obtained by crushing the crushing unit are introduced into the separation unit. The separation unit is configured to separate part of the powder and the volatile organic matter as a whole, the diaphragm crushes and the remaining part of the powder. The piezoelectric catalytic lithium pre-extraction equipment also includes a pulping device, the top of which is connected to the pretreatment device through a pipeline, and the powder obtained by the pretreatment device is introduced into the pulping device. The pulping device is configured to mix the powder with water to obtain a mixed slurry, and the screening mechanism is connected to the pulping device through a pipeline.

7. The piezoelectric catalytic lithium pre-extraction device according to claim 6, characterized in that: The pulping device includes a pulping body, and the pulping body includes a pulping cylinder and a material balancing plate group. The pulping cylinder has a feed chamber and a mixing chamber located at the bottom of the feed chamber and connected to the feed chamber. The top of the pulping cylinder also forms a feed port connected to the feed chamber, and the feed port is connected to the pretreatment device through a pipeline. The feed port is used to introduce powder into the feed chamber. The pulping cylinder also has at least one water inlet connected to the feed chamber, and the water inlet is used to supply water to the feed chamber. The material balancing plate group includes at least one first material balancing plate and at least one second material balancing plate. The at least one first material balancing plate The plate and at least one of the second material balancing plates are arranged in the mixing chamber at intervals along the vertical direction. In the direction in which the side wall of the mixing chamber is extended from the center of the mixing chamber to the pulping cylinder to form the mixing chamber, the distance between the upper surface of the first material balancing plate and a horizontal plane located below it gradually decreases, and the distance between the upper surface of the second material balancing plate and a horizontal plane located below it gradually increases. Among the first material balancing plates and the second material balancing plates arranged in the vertical direction, one of the first material balancing plates is located at the uppermost layer, and one of the second material balancing plates is located at the lowermost layer. The first material balancing plate forms a plurality of first material balancing plates at its position close to the peripheral wall of the pulping cylinder. The slurry above the first material balancing plate flows downward through the first material balancing hole to the edge of the second material balancing plate below the first material balancing plate, and the second material balancing plate forms a second material balancing hole which is coaxial with the slurry cylinder and corresponds to the center of the first material balancing plate. The slurry above the second material balancing plate flows downward through the second material balancing hole to the center of the first material balancing plate below the slurry cylinder or the outside of the slurry cylinder. The slurry composed of the powder introduced by the feed port and the water introduced by the water inlet flows out from the slurry cylinder. After the feed chamber is introduced into the mixing chamber, the slurry flows in sequence to at least one of the first material balancing plate and at least one of the second material balancing plates arranged at intervals. The slurry first flows to the center of the first material balancing plate and flows to its edge under the action of gravity for mixing. The slurry first flows to the edge of the second material balancing plate and flows to its center under the action of gravity for mixing. The second through hole of the second material balancing plate located at the bottom layer is used to discharge the mixed slurry in the mixing chamber. The mixed slurry discharged from the second through hole of the second material balancing plate located at the bottom layer flows to the high end of the screening assembly through a pipeline.

8. The piezoelectric catalytic lithium pre-extraction device according to claim 7, characterized in that: The pulping device also includes an equalizing member, which is installed above the first equalizing plate located on the uppermost layer and located at the center corresponding to the first equalizing plate. The equalizing member corresponds to the feed chamber. The top of the equalizing member is open and can accommodate slurry. The slurry that moves through the feed chamber and flows to the mixing chamber is first gathered in the equalizing member.

9. The piezoelectric catalytic lithium pre-extraction device according to claim 7, characterized in that: The pulping device also includes at least one mixing piece, which is installed in the feed chamber. The mixing piece extends downward from a side wall of the feed chamber and is inclined toward the center, and there is a gap between the mixing piece and the other opposite side wall of the feed chamber. The mixing piece is located on the flow path of the powder introduced into the feed chamber from the feed port.

10. The working method of the piezoelectric catalytic lithium pre-extraction device according to any one of claims 1 to 9, characterized in that: The steps include: The screening mechanism screens the mixed slurry to separate the copper-aluminum slurry and the ultra-fine powder slurry; The pole powder slurry separated by the screening mechanism is introduced into the stirring chamber located at the uppermost layer from the inlet of the stirring body, and the piezoelectric stirring element in the stirring chamber located at the uppermost layer is driven by the stirring shaft group to rotate to stir the pole powder slurry in the corresponding stirring chamber, so that the pole powder in the pole powder slurry rubs with water, the pole powder rubs with the pole powder, and the pole powder rubs with the second piezoelectric coating to leach at least part of the lithium, and at the same time, the scraping element in the corresponding stirring chamber is driven by the stirring shaft group to rotate to scrape the pole powder slurry to the discharge trough so as to be discharged from the discharge trough to the next stirring chamber, so as to perform piezoelectric stirring operations multiple times, and finally discharge the lithium extraction slurry obtained by multiple lithium leaching from the outlet; The copper-aluminum material in the slurry separated by the screening mechanism is introduced into the second separation component, and the second separation component performs solid-liquid separation on the copper-aluminum material in the slurry to obtain copper-aluminum material and pole powder slurry. The pole powder slurry separated by the second separation component is introduced into the stirring body through the introduction port.

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