A screening device for extracting lithium carbonate in lithium batteries

Abstract

The application discloses a screening device for extracting lithium carbonate in lithium batteries, and relates to the technical field of waste battery recycling.The application comprises a pretreatment box, the bottom of the pretreatment box is provided with a graphite filtering box, the pretreatment box and the graphite filtering box are connected in communication through a first transmission pipe, a first transmission valve is arranged on the first transmission pipe, the bottom of the graphite filtering box is provided with a separation box, and the graphite filtering box and the separation box are connected in communication through a second transmission pipe.The application can realize chemical treatment of graphite, nickel, cobalt and manganese contained in the positive electrode of the battery and step-by-step targeted separation, thereby improving the purity of the lithium carbonate.The pretreatment box, the graphite filtering box, the separation box and the screening box can be used separately or in combination, and can be used separately or integrally, so that the working efficiency of recycling lithium carbonate in waste lithium batteries is improved.

Description

Technical Field

[0001] This invention belongs to the field of waste battery recycling, specifically, it relates to a screening device for extracting lithium carbonate from lithium batteries. Background Technology

[0002] Lithium-ion batteries are currently the most widely used type of battery in electronic products, primarily in smartphones, laptops, tablets, and electric vehicles. The cathode material in most of these batteries is made from battery-grade lithium carbonate. Battery-grade lithium carbonate offers high energy density and long lifespan, and is also more environmentally friendly and safer, giving it a promising market prospect. Discarded lithium batteries contain a large amount of valuable lithium carbonate; if not recycled, this not only wastes resources but also pollutes the environment. Recycling and extracting this lithium carbonate can effectively reduce environmental pollution and achieve resource reuse, thus realizing the dual goals of environmental protection and resource conservation.

[0003] In existing lithium battery extraction and screening devices for recycling lithium carbonate from waste lithium batteries, the positive electrode material cannot be chemically treated. Since the positive electrode contains graphite, nickel, cobalt, and manganese, it needs to be chemically separated before solid-liquid separation by passing it through a filter plate or filter membrane. This process is inefficient, requires multiple chemical treatments, and necessitates frequent replacement of chemical treatment and filtration equipment, which is cumbersome and affects work efficiency.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a screening device for extracting lithium carbonate from lithium batteries.

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0007] A screening device for extracting lithium carbonate from lithium batteries includes a pretreatment box, a graphite filter box at the bottom of the pretreatment box, and a first transmission pipe connected to the graphite filter box via a first transmission pipe equipped with a first transmission valve. A separation box is installed at the bottom of the graphite filter box, and the graphite filter box and the separation box are connected via a second transmission pipe equipped with a second transmission valve. A screening box is installed at the bottom of the separation box, and the separation box and the screening box are connected via a third transmission pipe equipped with a third transmission valve. A material receiving assembly is installed on one side of the screening box. The first, second, and third transmission valves are electric valves, connected to an external power source, and electrically connected to an external controller.

[0008] Optionally, a first motor is installed on the top of the pretreatment box, with its output end movably penetrating the pretreatment box. A first stirring rod is installed on the output end of the first motor. An inlet pipe and a first reagent pipe are respectively installed on both sides of the top of the pretreatment box, connected to the pretreatment box. A first heating wire is embedded inside the pretreatment box. A liquid outlet pipe is installed at the bottom of the side of the pretreatment box, with a liquid outlet valve installed on it. A sealing filter plate is installed on the inner side of the liquid outlet pipe. The liquid outlet valve is an electric valve, and the liquid outlet valve and the first motor are connected to an external power supply. The first motor and the liquid outlet valve are also electrically connected to an external controller, thereby enabling the controller to control the first motor and the liquid outlet valve. The inlet pipe cooperates with an external feeding device, and the first reagent pipe is connected to an external reagent tank via a pipe. A delivery pump is installed on the reagent tank.

[0009] Optionally, slots are provided on both sides of the inner cavity of the graphite filter box, and a locking block is slidably fitted in the slot. A graphite filter element is installed on one side of the locking block. A second motor is installed at the bottom of one side of the graphite filter box. The output end of the second motor moves through the graphite filter box and is equipped with a second stirring rod. A second reagent tube is installed in the middle of one side of the graphite filter box and is connected to the graphite filter box. The second reagent tube is connected to an external reagent container through a pipe. The reagent container is equipped with a delivery pump. The second motor is connected to an external power supply and is also electrically connected to an external controller. Filter holes are provided on both sides and at the bottom of the graphite filter element.

[0010] Optionally, concave fixing blocks are installed on both sides of the inner cavity of the separation box, and diaphragm filter plates are snapped onto the concave fixing blocks. A second heating wire is embedded inside the separation box. The second heating wire is connected to an external power supply and is also electrically connected to an external controller.

[0011] Optionally, a third reagent tube is installed on one side of the separation chamber, which is connected to the separation chamber and located below the concave fixing block; the third reagent tube is connected to an external reagent container through a pipe, and the reagent container is equipped with a delivery pump.

[0012] Optionally, trapezoidal grooves are provided on both sides of the inner cavity of the screening box, and trapezoidal blocks are slidably fitted in the trapezoidal grooves. A U-shaped filter plate is installed on one side of the trapezoidal block, and a liquid guide pipe is installed at the bottom of one side of the screening box. A liquid guide valve is installed on the liquid guide pipe. The liquid guide valve is connected to an external power supply and is also electrically connected to an external controller.

[0013] Optionally, a discharge pipe is installed on one side of the screening box above the trapezoidal groove. The discharge pipe is connected to the screening box. The screening box is equipped with a feeding assembly that cooperates with the U-shaped filter plate. The lithium carbonate is separated from the solution through the U-shaped filter plate and the lithium carbonate is collected.

[0014] Optionally, the feeding assembly includes a third motor mounted on one side of the screening box. The output end of the third motor movably passes through the screening box. A rotating rod is mounted on the output end of the third motor. A rotating cylinder is mounted on the side of the rotating rod. Multiple perforated plates are mounted on the periphery of the rotating cylinder. A feeding brush plate is mounted on the end of the perforated plate away from the rotating cylinder. One side of the feeding brush plate contacts the U-shaped filter plate. The rotation trajectory arc of the contact surface of the feeding brush plate is the same as the inner arc position of the U-shaped filter plate. The third motor is connected to an external power supply, and the liquid guiding valve is electrically connected to an external controller.

[0015] Optionally, the receiving assembly includes a mounting frame installed on one side of the screening box, a receiving drawer that slides within the mounting frame, a handle installed on one side of the receiving drawer, and a draining component snapped onto the top of the receiving drawer; the draining component has multiple drain holes at its bottom.

[0016] Optionally, each of the pretreatment box, graphite filter box, separation box, and screening box is equipped with a door on one side, and a sealing element is installed between the door and the pretreatment box, graphite filter box, separation box, and screening box.

[0017] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all of the following advantages at the same time:

[0018] This invention utilizes a pretreatment box, a graphite filter box, a separation box, and a screening box to chemically treat and progressively separate graphite, nickel, cobalt, and manganese contained in the positive electrode of a battery, thereby improving the purity of lithium carbonate. The pretreatment box, graphite filter box, separation box, and screening box can be used individually or in combination, making them convenient to use and improving the efficiency of recycling lithium carbonate from waste lithium batteries.

[0019] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0020] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0021] Figure 1 This is a schematic diagram of a structure according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of a screening device according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the internal structure of a screening device according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the internal structure of the pretreatment box according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the internal structure of a graphite filter box according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the internal structure of the separation box according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the feeding assembly structure according to an embodiment of the present invention;

[0028] Figure 8 This is an exploded view of the material receiving assembly according to an embodiment of the present invention;

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 1. Pretreatment box; 2. Graphite filter box; 3. Separation box; 4. Sieving box; 5. Material receiving assembly; 6. First motor; 7. First stirring rod; 8. First heating wire; 9. Feed pipe; 10. First reagent tube; 11. Discharge pipe; 12. Discharge valve; 1201. Sealing filter plate; 13. First transfer pipe; 14. First transfer valve; 15. Slot; 16. Locking block; 17. Graphite filter element; 18. Second motor; 19. Second stirring rod; 20. Second reagent tube; 21. Second transfer pipe; 2 2. Second transfer valve; 23. Concave fixing block; 24. Diaphragm filter plate; 25. Third reagent tube; 26. Second heating wire; 27. Third transfer tube; 28. Third transfer valve; 29. ​​Trapezoidal groove; 30. Trapezoidal block; 31. U-shaped filter plate; 32. Liquid guide tube; 33. Liquid guide valve; 34. Discharge tube; 35. Third motor; 36. Rotating rod; 37. Rotating cylinder; 38. Perforated plate; 39. Feeding brush plate; 40. Mounting frame; 41. Receiving drawer; 42. Handle; 43. Leakage part.

[0031] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0032] The invention will now be described in further detail with reference to the accompanying drawings.

[0033] Please see Figure 1-8As shown, this embodiment provides a screening device for extracting lithium carbonate from lithium batteries, including a pretreatment box 1, a graphite filter box 2 installed at the bottom of the pretreatment box 1, the pretreatment box 1 and the graphite filter box 2 being connected by a first transmission pipe 13, a first transmission valve 14 being provided on the first transmission pipe 13, a separation box 3 installed at the bottom of the graphite filter box 2, the graphite filter box 2 and the separation box 3 being connected by a second transmission pipe 21, a second transmission valve 22 being provided on the second transmission pipe 21, a screening box 4 installed at the bottom of the separation box 3, the separation box 3 and the screening box 4 being connected by a third transmission pipe 27, a third transmission valve 28 being provided on the third transmission pipe 27, and a receiving assembly 5 being installed on one side of the screening box 4.

[0034] One application of this embodiment is as follows: In use, the lithium battery positive electrode material is placed into the pretreatment tank 1 through the feed pipe 9. Then, an appropriate amount of sodium carbonate solution is added through the first reagent pipe 10, allowing the sodium carbonate solution to chemically react with the lithium battery positive electrode material. After the chemical reaction, a first mixed solution and a black precipitate are obtained. Excess first mixed solution is discharged through the outlet pipe 11. After discharge, an appropriate amount of distilled water and concentrated sulfuric acid are added through the feed pipe 9. Then, the first motor 6 is started, driving the first stirring rod 7 to rotate, mixing the distilled water and concentrated sulfuric acid with the black precipitate. The interior of the pretreatment tank 1 is then heated through the first heating wire 8, thereby accelerating the reaction rate between the distilled water and concentrated sulfuric acid and the black precipitate. After heating... A suitable amount of hydrogen peroxide is added again through the first reagent tube 10. After the black precipitate solid completely dissolves, a second mixed solution is obtained. A suitable amount of ammonia is then added again through the first reagent tube 10 to neutralize the excess sulfuric acid, bringing the second mixed solution to a suitable acidity. The second mixed solution is then transported to the graphite filter box 2 through the first transfer tube 13. The second mixed solution falls under gravity and passes through the graphite filter element 17, which filters out the graphite in the second mixed solution. The second mixed solution, now free of graphite, continues to fall under gravity and eventually accumulates at the bottom of the inner cavity of the graphite filter box 2. Then, a suitable amount of ammonium sulfate is added to the graphite filter box 2 through the second reagent tube 20. The ammonium sulfate reacts with the sulfuric acid in the second mixed solution... The manganese undergoes a chemical reaction, converting it into an insoluble black precipitate in the second mixed solution. This insoluble black precipitate is named manganese precipitate. Then, an appropriate amount of sodium peroxide is added to the graphite filter box 2 via the second reagent tube 20. The second motor 18 is started, driving the second stirring rod 19 to rotate, thereby converting the nickel and cobalt in the second mixed solution into insoluble green precipitates. This insoluble black precipitate is named nickel and cobalt precipitate. Then, the mixture of manganese, nickel, and cobalt precipitates is transported to the separation box 3 via the second transfer tube 21. Under gravity, it passes through the diaphragm filter plate 24, which separates the manganese, nickel, and cobalt precipitates. The resulting mixture... The mixture is then added to the separation tank 3 via the third reagent tube 25. The separation tank 3 is heated by the second heating wire 26, causing the concentrated sodium carbonate solution to chemically react with the sodium sulfate and ammonium sulfate in the mixed liquid within the separation tank 3, thereby separating lithium carbonate. Finally, the mixed solution after lithium carbonate separation is transported to the screening tank 4 via the third transfer tube 27. Under gravity, the mixed solution passes through the U-shaped filter plate 31, which filters out the lithium carbonate. The remaining mixed liquid continues to fall under gravity and is discharged through the liquid guide tube 32. The lithium carbonate on the U-shaped filter plate 31 is then removed by starting the third motor 35, which drives the rotating rod 36 to rotate, which in turn drives the rotating cylinder 37 to rotate.The rotating cylinder 37 drives the perforated plate 38 and the feeding brush plate 39 to rotate counterclockwise. Under the action of the perforated plate 38 and the feeding brush plate 39 on the U-shaped filter plate 31, the liquid enters the discharge pipe 34 and is guided by the discharge pipe 34 into the leakage component 43 of the receiving assembly 5. Under the action of the leakage component 43, the liquid conveyed by the perforated plate 38 and the feeding brush plate 39 is collected in the receiving drawer 41. Through the pretreatment box 1, graphite filter box 2, separation box 3, and screening box 4, the positive electrode of the battery containing graphite, nickel, cobalt, and manganese can be chemically treated and gradually separated, thereby improving the purity of lithium carbonate. The pretreatment box 1, graphite filter box 2, separation box 3, and screening box 4 can be used individually or in combination, making them convenient to use and improving the efficiency of recycling lithium carbonate from waste lithium batteries.

[0035] Please see Figure 1-3 As shown, in this embodiment, a first motor 6 is installed on the top of the pretreatment box 1. The output end of the first motor 6 movably passes through the pretreatment box 1. A first stirring rod 7 is installed on the output end of the first motor 6. An inlet pipe 9 and a first reagent pipe 10 are respectively installed on both sides of the top of the pretreatment box 1, which are connected to the pretreatment box 1. A first heating wire 8 is embedded inside the pretreatment box 1. An outlet pipe 11 is installed at the bottom of the side of the pretreatment box 1. An outlet valve 12 is installed on the outlet pipe 11. A sealing filter plate 1201 is installed on the inner side of the outlet pipe 11. The outlet valve 12 is an electric valve. The outlet valve 12 and the first motor 6 are connected to an external power source. The first motor 6 and the outlet valve 12 are also electrically connected to an external controller, so that the controller controls the first motor 6 and the outlet valve 12. The inlet pipe 9 cooperates with an external feeding device. The first reagent pipe 10 is connected to an external reagent tank through a pipe. A delivery pump is installed on the reagent tank.

[0036] The lithium battery positive electrode material is fed into the pretreatment tank 1 through the feed pipe 9. Then, an appropriate amount of sodium carbonate solution is added through the first reagent pipe 10, causing a chemical reaction between the sodium carbonate solution and the lithium battery positive electrode material. After the chemical reaction, a first mixed solution and a black precipitate are obtained. Excess first mixed solution is discharged through the outlet pipe 11, controlled by the outlet valve 12. A sealing filter plate 1201 prevents the black precipitate from being discharged from the outlet pipe 11. After discharge, an appropriate amount of distilled water and concentrated sulfuric acid are added through the feed pipe 9. Then, by starting the first motor 6, the first motor 6 drives the first stirring rod 7 to rotate, so that distilled water and concentrated sulfuric acid are mixed with the black precipitate solid. Then, the inside of the pretreatment tank 1 is heated by the first heating wire 8, thereby accelerating the reaction rate of distilled water and concentrated sulfuric acid with the black precipitate solid. After heating, an appropriate amount of hydrogen peroxide is added again through the first reagent tube 10. When the black precipitate solid is completely dissolved, a second mixed solution is obtained. An appropriate amount of ammonia water is added again through the first reagent tube 10 to neutralize the excess sulfuric acid, so that the second mixed solution reaches a suitable acidity, which is conducive to separating graphite from the lithium battery cathode material.

[0037] Please see Figure 1-4 As shown, in this embodiment, slots 15 are provided on both sides of the inner cavity of the graphite filter box 2. A locking block 16 is slidably fitted in the slot 15. A graphite filter element 17 is installed on one side of the locking block 16. A second motor 18 is installed at the bottom of one side of the graphite filter box 2. The output end of the second motor 18 moves through the graphite filter box 2. A second stirring rod 19 is installed at the output end of the second motor 18. A second reagent tube 20 is installed in the middle of one side of the graphite filter box 2. The second reagent tube 20 is connected to the graphite filter box 2. The second reagent tube 20 is connected to an external reagent tank through a pipe. A delivery pump is installed on the reagent tank. The second motor 18 is connected to an external power supply and is also electrically connected to an external controller. Filter holes are provided on both sides and at the bottom of the graphite filter element 17.

[0038] The second mixed solution falls under gravity via a pump. As it passes through the graphite filter 17, the filter removes the graphite. The solution continues to fall under gravity and eventually accumulates at the bottom of the graphite filter box 2. Then, an appropriate amount of ammonium sulfate is added to the filter box 2 via the second reagent tube 20. The ammonium sulfate reacts chemically with the manganese in the second mixed solution, converting it into an insoluble black precipitate, named manganese precipitate. Another appropriate amount of sodium peroxide is added to the filter box 2 via the second reagent tube 20. The second motor 18 is then activated, driving the second stirring rod 19 to rotate, thereby converting the nickel and cobalt in the second mixed solution into an insoluble green precipitate. This facilitates the filtration and collection of graphite through the graphite filter 17, and also chemically treats the nickel, manganese, and cobalt in the second mixed solution.

[0039] Please see Figure 1-5 As shown, in this embodiment, concave fixing blocks 23 are installed on both sides of the inner cavity of the separation box 3. A diaphragm filter plate 24 is snapped onto the concave fixing block 23. A second heating wire 26 is embedded inside the separation box 3. The second heating wire 26 is connected to an external power supply and is also electrically connected to an external controller.

[0040] The second heating wire 26 heats the separation chamber 3, which helps to accelerate the chemical reaction between the concentrated sodium carbonate solution and the sodium sulfate and ammonium sulfate in the mixed liquid in the separation chamber 3. The manganese precipitate, nickel and cobalt precipitate are separated by the membrane filter plate 24. The mixed liquid after separating the manganese precipitate, nickel and cobalt precipitate is then separated.

[0041] Please see Figure 1-5 As shown, a third reagent tube 25 is installed on one side of the separation box 3 in this embodiment. The third reagent tube 25 is connected to the separation box 3 and is located below the concave fixing block 23. The third reagent tube 25 is connected to an external reagent container through a pipe, and the reagent container is equipped with a delivery pump.

[0042] By positioning the third reagent tube 25 below the concave fixing block 23, the addition of a suitable amount of concentrated sodium carbonate solution from the third reagent tube 25 avoids reaction with the manganese, nickel, and cobalt precipitates on the diaphragm filter plate 24.

[0043] Please see Figure 1-6 As shown, trapezoidal grooves 29 are provided on both sides of the inner cavity of the screening box 4 in this embodiment. Trapezoidal blocks 30 are slidably fitted in the trapezoidal grooves 29. A U-shaped filter plate 31 is installed on one side of the trapezoidal block 30. A liquid guide pipe 32 is installed at the bottom of one side of the screening box 4. A liquid guide valve 33 is provided on the liquid guide pipe 32. The liquid guide valve 33 is connected to an external power supply and is also electrically connected to an external controller.

[0044] The excess solution is discharged through the liquid outlet valve 33.

[0045] Please see Figure 1-6 As shown, in this embodiment, a discharge pipe 34 is installed on one side of the screening box 4 above the trapezoidal groove 29. The discharge pipe 34 is connected to the screening box 4. The screening box 4 is provided with a feeding assembly that cooperates with the U-shaped filter plate 31.

[0046] The U-shaped filter plate 31 separates lithium carbonate from the solution and collects the lithium carbonate.

[0047] Please see Figure 1-7 As shown, the feeding assembly in this embodiment includes a third motor 35 mounted on one side of the screening box 4. The output end of the third motor 35 movably passes through the screening box 4. A rotating rod 36 is mounted on the output end of the third motor 35. A rotating cylinder 37 is mounted on the side of the rotating rod 36. A plurality of perforated plates 38 are mounted on the periphery of the rotating cylinder 37. A feeding brush plate 39 is mounted on one end of the perforated plate 38 away from the rotating cylinder 37. One side of the feeding brush plate 39 is in contact with the U-shaped filter plate 31. The rotation trajectory arc of the contact surface of the feeding brush plate 39 is the same as the inner arc position of the U-shaped filter plate 31. The third motor 35 is connected to an external power supply, and the liquid guiding valve 33 is electrically connected to an external controller. When the perforated plate 38 is in a horizontal position, it is located above the discharge pipe 34.

[0048] The feeding assembly activates the third motor 35, which in turn drives the rotating rod 36 to rotate. The rotating rod 36 in turn drives the rotating cylinder 37 to rotate, which in turn drives the perforated plate 38 and the feeding brush plate 39 to rotate counterclockwise. Since the discharge pipe 34 is located above the trapezoidal groove 29, it is positioned above the U-shaped filter plate 31 and below the perforated plate 38 when it is in a horizontal position. Therefore, under the action of the perforated plate 38 and the feeding brush plate 39 on the U-shaped filter plate 31, lithium carbonate on the U-shaped filter plate 31 enters the discharge pipe 34, which is beneficial for feeding lithium carbonate.

[0049] Please see Figure 1-8 As shown, the receiving component 5 in this embodiment includes a mounting frame 40 installed on one side of the screening box 4. A receiving drawer 41 is slidably fitted inside the mounting frame 40. A handle 42 is installed on one side of the receiving drawer 41. A draining component 43 is snapped onto the top of the receiving drawer 41. Multiple draining holes are provided at the bottom of the draining component 43.

[0050] The liquid from the porous plate 38 and the feeding brush plate 39 is collected in the receiving drawer 41 through the liquid collection component 5 and the liquid leakage hole of the liquid leakage component 43. The lithium carbonate from the porous plate 38 and the feeding brush plate 39 is also collected in the liquid leakage component 43.

[0051] Please see Figure 1-2 As shown, in this embodiment, each of the pretreatment box 1, graphite filter box 2, separation box 3, and screening box 4 is provided with a door on one side, and a sealing element is provided between the door and the pretreatment box 1, graphite filter box 2, separation box 3, and screening box 4.

[0052] The designated doors facilitate the cleaning of components inside the pretreatment box 1, graphite filter box 2, separation box 3, and screening box 4 by staff.

[0053] This invention is not limited to the embodiments described above. Anyone should understand that structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention. Technical aspects, shapes, and structures not described in detail in this invention are all publicly known technologies.

Claims

1. A screening device for extracting lithium carbonate in a lithium battery, characterized by: The utility model provides a graphite separation and screening device, including preprocessing box (1), the bottom of preprocessing box (1) is equipped with graphite filter box (2), and preprocessing box (1) is connected with graphite filter box (2) through first transmission pipe (13), is provided with first transmission valve (14) on first transmission pipe (13), the bottom of graphite filter box (2) is equipped with separation tank (3), and graphite filter box (2) is connected with separation tank (3) through second transmission pipe (21), is provided with second transmission valve (22) on second transmission pipe (21), the bottom of separation tank (3) is equipped with screening box (4), and separation tank (3) is connected with screening box (4) through third transmission pipe (27), is provided with third transmission valve (28) on third transmission pipe (27), and one side of screening box (4) is equipped with material receiving subassembly (5);Both sides of the inner chamber of screening box (4) are provided with trapezoidal groove (29), and trapezoidal groove (29) is slidably connected with trapezoidal block (30), one side of trapezoidal block (30) is equipped with U-shaped filter plate (31), the bottom of one side of screening box (4) is equipped with liquid guide pipe (32), and liquid guide valve (33) is arranged on liquid guide pipe (32);One side of screening box (4) is equipped with discharge pipe (34) above trapezoidal groove (29), and discharge pipe (34) is connected with screening box (4), and the feeding assembly that is provided with U-shaped filter plate (31) is arranged on screening box (4).

2. A screening device for extracting lithium carbonate from lithium batteries as claimed in claim 1, wherein: The top of preprocessing box (1) is equipped with first motor (6), and the output end of first motor (6) is movably penetrated through preprocessing box (1), and the output end of first motor (6) is equipped with first stirring rod (7), and the top of preprocessing box (1) is equipped with inlet pipe (9) and first reagent pipe (10) respectively on both sides of first motor (6), and inlet pipe (9) and first reagent pipe (10) are connected with preprocessing box (1), and first heating wire (8) is embedded in preprocessing box (1), and the bottom of the side of preprocessing box (1) is equipped with liquid outlet pipe (11), and liquid outlet valve (12) is arranged on liquid outlet pipe (11), and the inner side of liquid outlet pipe (11) is equipped with blocking filter plate (1201).

3. A screening device for extracting lithium carbonate from lithium batteries as claimed in claim 1, wherein: Both sides of the inner chamber of graphite filter box (2) are provided with clamping groove (15), and clamping groove (15) is slidably connected with clamping block (16), one side of clamping block (16) is equipped with graphite filter piece (17), the bottom of one side of graphite filter box (2) is equipped with second motor (18), and the output end of second motor (18) is movably penetrated through graphite filter box (2), and the output end of second motor (18) is equipped with second stirring rod (19), and the middle of one side of graphite filter box (2) is equipped with second reagent pipe (20), and second reagent pipe (20) is connected with graphite filter box (2).

4. A screening device for extracting lithium carbonate from lithium batteries as claimed in claim 1, wherein: Both sides of the inner chamber of separation tank (3) are equipped with concave fixing block (23), and diaphragm filter plate (24) is clamped on concave fixing block (23), and second heating wire (26) is embedded in separation tank (3).

5. A screening device for extracting lithium carbonate from lithium batteries as claimed in claim 4, wherein: One side of separation tank (3) is equipped with third reagent pipe (25), and third reagent pipe (25) is connected with separation tank (3), and third reagent pipe (25) is below concave fixing block (23).

6. A screening device for extracting lithium carbonate from lithium batteries as claimed in claim 1, wherein: The feeding assembly comprises a third motor (35) arranged on one side of the screening box (4), the output end of the third motor (35) movably penetrates the screening box (4), the output end of the third motor (35) is provided with a rotating rod (36), the side surface of the rotating rod (36) is provided with a rotating cylinder (37), the circumferential side of the rotating cylinder (37) is provided with a plurality of porous plates (38), one end of the porous plate (38) away from the rotating cylinder (37) is provided with a feeding brush plate (39), one side of the feeding brush plate (39) is in contact with the U-shaped filter plate (31), and the rotation track arc of the contact surface of the feeding brush plate (39) is the same as the inner arc position of the U-shaped filter plate (31).

7. A screening device for extracting lithium carbonate from lithium batteries as claimed in claim 1, wherein: The material collecting assembly (5) comprises a mounting frame (40) arranged on one side of the screening box (4), a material collecting drawer (41) is slidably arranged in the mounting frame (40), a handle (42) is arranged on one side of the material collecting drawer (41), and a liquid leakage piece (43) is connected to the top of the material collecting drawer (41).

8. A screening device for extracting lithium carbonate from lithium batteries as claimed in claim 1, wherein: The pretreatment box (1), the graphite filtering box (2), the separation box (3) and the screening box (4) are all provided with a box door on one side.

Images