A recycling device and recycling method based on lithium battery powder extraction

Abstract

The present invention relates to the field of battery recycling technology, and more specifically, it relates to a recovery device based on extracting lithium battery powder and a recovery method thereof, comprising a immersion tank, a drainage channel and a drainage cover located at the upper end of the drainage channel being provided at the bottom of the immersion tank, a first rotary drive mechanism and a stirring shaft connected to the first rotary drive mechanism being mounted on the immersion tank, the stirring shaft being vertically arranged in the immersion tank, the first rotary drive mechanism controlling the stirring shaft to rotate around a vertical axis, the stirring shaft comprising a shaft body and a filter cartridge arranged at the lower end of the shaft body, the filter cartridge being provided with a plurality of filter holes, the lower end of the filter cartridge being abutted against the bottom of the immersion tank, the filter cartridge being vertically aligned with the upper end of the drainage channel, a recovery device based on extracting lithium battery powder and a recovery method thereof of the present invention can effectively improve the reaction rate and reaction effect when the leached residue is soaked again.

Description

Technical Field

[0001] The present invention relates to the technical field of battery recycling, and in particular to a recycling device and a recycling method based on extracting lithium battery powder. Background Art

[0002] With the rapid development of the new energy industry, the demand for battery recycling of waste batteries is also increasing. In the existing technology, after lithium extraction from lithium batteries, their battery powder can still obtain more usable materials through subsequent recycling, such as battery-grade nickel-cobalt-manganese solution and battery-grade graphite raw materials.

[0003] For example, a Chinese patent with publication number CN117044009A discloses a recycling method for lithium battery powder, which includes the following steps: slurrying the battery powder after lithium extraction to obtain a slurry; mixing sulfuric acid, a reducing agent and the slurry, and performing a first leaching and filtering operation to obtain a first leachate and a first leach residue; performing a P204 extraction and impurity removal operation on the first leachate to obtain a battery-grade nickel-cobalt-manganese solution; mixing the sulfuric acid, the reducing agent and the first leach residue, and performing a second leaching and filtering operation to obtain a second leachate and a second leach residue; performing an impurity removal and filtering operation on the second leachate to obtain a filtrate and a filtrate residue; and performing a high-acid leaching and filtering operation on the second leach residue to obtain a battery-grade graphite raw material. Ultimately, while recovering a battery-grade nickel-cobalt-manganese solution, the waste of graphite resources is avoided.

[0004] In the above-mentioned prior art, the leaching residue needs to be soaked repeatedly, including the re-immersion of the first leaching residue and the re-immersion of the second leaching residue. Usually, the leaching residue will accumulate on the filter screen, resulting in uneven distribution of the leaching residue during the re-immersion process, which reduces the reaction rate and reaction effect of the leaching residue during the re-immersion. One of the solutions is to add a stirring shaft in the soaking tank, but it is still difficult to quickly stir the leaching residue accumulated on the filter screen, affecting the recovery efficiency. In order to enable the leaching residue to react quickly and fully with solvents such as sulfuric acid and hydrogen peroxide during the re-immersion process, it is urgent to design a recovery device that can quickly stir the leaching residue. Summary of the Invention

[0005] In order to enable the leached residue to react quickly and fully with solvents such as sulfuric acid and hydrogen peroxide during the re-immersion process, the present application provides a recovery device based on extracting lithium battery powder and a recovery method thereof.

[0006] In a first aspect, the present invention provides a recovery device based on extracting lithium battery powder, which adopts the following technical solution:

[0007] A recovery device based on extracting lithium battery powder, comprising a soaking tank, wherein a drainage channel and a drainage cover located at the upper end of the drainage channel are provided at the bottom of the soaking tank, a first rotary drive mechanism and a stirring shaft connected to the first rotary drive mechanism are mounted on the soaking tank, the stirring shaft is vertically arranged in the soaking tank, the first rotary drive mechanism controls the stirring shaft to rotate around a vertical axis, the stirring shaft comprises a shaft body and a filter cartridge arranged at the lower end of the shaft body, the filter cartridge is provided with a plurality of filter holes, the lower end of the filter cartridge abuts the bottom of the soaking tank, and the filter cartridge is vertically aligned with the upper end of the drainage channel.

[0008] Preferably, the upper end of the drainage channel is vertically connected to the bottom surface of the soaking pool, and the lower end of the drainage channel is horizontally connected to the outer wall of the soaking pool. A groove is provided between the upper end of the drainage channel and the bottom surface of the soaking pool, the width of the groove is greater than the width of the drainage channel, and the drainage cover is embedded in the groove.

[0009] Preferably, a core body is vertically telescopically provided at the lower end of the shaft body of the stirring shaft, and a first telescopic drive mechanism for controlling the extension and retraction of the core body is provided in the shaft body. The length of the core body is greater than or equal to the length of the filter cartridge, and the outer diameter of the core body is equal to the inner diameter of the filter cartridge.

[0010] Preferably, the outer wall of the core body is provided with multiple rods that are telescopically extended along the radial direction, and a second telescopic drive mechanism is provided inside the core body to control the telescopic extension of the rod body. The diameter of the rod body is equal to the diameter of the filter hole of the filter cylinder. When the core body is extended into the inside of the filter cylinder, the rod body is used to extend out of the filter hole.

[0011] Preferably, during the homogenizing stage, the stirring shaft rotates rapidly, and during the filtering stage, the stirring shaft rotates slowly.

[0012] Preferably, a slider module is provided on the top of the soaking tank, the first rotary drive mechanism is provided on the slider module, and the slider module controls the first rotary drive mechanism to perform reciprocating motion in the lateral direction.

[0013] Preferably, a first threaded hole is provided at the lower end of the core body, the embedding groove is a rectangular groove, the drain cover is a rectangular cover, a second threaded hole is provided at the upper end of the drain cover, the first threaded hole and the second threaded hole are consistent in size and are continuously provided, a screw is threadedly connected to the first threaded hole, a second rotation drive mechanism is provided in the core body, the second rotation drive mechanism is telescopically connected to the screw and is used to control the rotation of the screw.

[0014] Preferably, a ball bearing is provided at the bottom of the filter cartridge, and the lower end of the stirring shaft abuts against the bottom surface of the soaking tank through the ball bearing.

[0015] In a second aspect, the present invention provides a recovery method based on extracting lithium battery powder, which adopts the following technical solution:

[0016] A recycling method based on extracting lithium battery powder comprises the following steps:

[0017] S1: closing the drainage channel and leaching a first leachate and a first leach residue in the immersion tank;

[0018] S2: opening the drainage channel, filtering out the first leachate, and extracting and removing impurities from the first leachate to obtain a battery-grade nickel-cobalt-manganese solution;

[0019] S3: closing the drainage channel, and the first rotary drive mechanism drives the stirring shaft to rotate, and then the stirring shaft stops rotating, and leaching the second leachate and the second leach residue in the immersion tank;

[0020] S4: opening the drainage channel, filtering out the second leachate, removing impurities from the second leachate and filtering to obtain iron-aluminum slag;

[0021] S5: repeating step S3 to leach a third leachate and a third leach residue in the immersion tank;

[0022] S6: opening the drainage channel, filtering out the third leachate, and using the third leachate residue as battery-grade graphite raw material.

[0023] Preferably, when the leachate is filtered, the stirring shaft keeps rotating, and the rotation speed of the stirring shaft in the stirring state is greater than the rotation speed of the stirring shaft in the filtering state.

[0024] The beneficial effects of the present invention are:

[0025] 1. When the leached residue needs to be soaked again, the drain cover is closed, and the first rotary drive mechanism controls the shaft of the stirring shaft to rotate rapidly. Since the leached residue accumulates at the filter cylinder of the shaft, the rotation of the shaft can quickly stir the leached residue, so that the leached residue can quickly and fully react with solvents such as sulfuric acid and hydrogen peroxide during the re-soaking process, effectively improving the reaction rate and reaction effect of the leached residue during the re-soaking process;

[0026] 2. When using the recovery device of the present application to filter out the leachate, the first rotary drive mechanism can be used to control the shaft of the stirring shaft to rotate slowly, so that the area around the filter cartridge of the stirring shaft maintains a relatively fluid state, thereby preventing the leachate residue from being easily blocked at the filter cartridge, and ultimately making it easier to filter out the leachate;

[0027] 3. When the leaching residue is re-soaked, the core body can be extended into the filter barrel first to close the filter holes. Then the rod body is extended out of the rod body, and the stirring shaft is rotated rapidly. In this way, the rod body is used to improve the crushing effect of the leaching residue while preventing the crushed leaching residue from directly entering the filter barrel. In addition, the rod body extending out of the filter hole can also play a clamping effect, making the relative position between the core body and the filter barrel more stable. When filtering out the leachate, the filter holes of the filter barrel can be dredged by the telescopic action of the rod body if necessary. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the internal structure of the soaking pool in the embodiment of the present application;

[0029] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle;

[0030] Figure 3 This is a schematic diagram of the internal structure of the stirring shaft in an embodiment of the present application;

[0031] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle.

[0032] Explanation of the accompanying drawings: 1. Soaking tank; 21. Drainage channel; 22. Drain cover; 3. Agitator shaft; 31. Shaft body; 32. Filter cartridge; 33. Ball; 4. Mounting frame; 51. First motor; 511. Reducer; 512. Drive shaft; 52. Second motor; 61. Core body; 62. Rod body; 71. First electric cylinder; 72. Second electric cylinder; 73. Battery; 81. First threaded hole; 82. Second threaded hole; 83. Screw; 9. Slider module. DETAILED DESCRIPTION

[0033] The following will be combined Figure 1-Figure 4 The present invention is further described with reference to the accompanying drawings and examples.

[0034] This embodiment discloses a recovery device based on extracting lithium battery powder.

[0035] Reference Figure 1 and Figure 2The recovery device based on extracting lithium battery powder includes a soaking tank 1. The bottom of the soaking tank 1 is provided with a drainage channel 21 and a drainage cover 22 located at the upper end of the drainage channel 21. The drainage cover 22 can be opened and closed. The drainage cover 22 is embedded in the bottom of the soaking tank 1 to avoid the presence of a bulge at the bottom of the soaking tank 1. A first rotary drive mechanism and a stirring shaft 3 connected to the first rotary drive mechanism are mounted on the soaking tank 1. The stirring shaft 3 is vertically arranged in the soaking tank 1. The first rotary drive mechanism controls the stirring shaft 3 to rotate around the vertical axis. The stirring shaft 3 includes a shaft body 31 and a filter cartridge 32 arranged at the lower end of the shaft body 31. The filter cartridge 32 passes through from top to bottom. The filter cartridge 32 is provided with a plurality of filter holes along the radial direction. The stirring shaft 3 abuts against the bottom of the soaking tank 1 with the lower end of the filter cartridge 32, and the filter cartridge 32 is vertically aligned with the upper end of the drainage channel 21. Through the above-mentioned arrangement, when the leaching residue is formed, the leachate can be filtered out from the filter barrel 32 by opening the drain cover 22, and the leaching residue is accumulated around the filter barrel 32. When it is necessary to soak again, the drain cover 22 is closed, and the first rotary drive mechanism controls the shaft body 31 of the stirring shaft 3 to rotate rapidly. Since the leaching residue is accumulated at the filter barrel 32 of the shaft body 31, the rotation of the shaft body 31 can make the leaching residue quickly stirred, so that the leaching residue can quickly and fully react with solvents such as sulfuric acid and hydrogen peroxide during the soaking process, effectively improving the reaction rate and reaction effect of the leaching residue during soaking. In addition, when using the recovery device of the present application to filter the leachate, the first rotary drive mechanism can be used to control the shaft body 31 of the stirring shaft 3 to rotate slowly, so that the filter barrel 32 of the stirring shaft 3 remains in a relatively fluid state, avoiding the leaching residue from being easily blocked at the filter barrel 32, and ultimately making the leachate easier to filter.

[0036] Reference Figure 1 A mounting bracket 4 is horizontally arranged at the top of the immersion tank 1. The first rotation drive mechanism includes a first motor 51, a reduction gear box 511 and a transmission shaft 512. The reduction gear box 511 is arranged on the mounting bracket 4. The power input port of the reduction gear box 511 faces upward and the power output port faces downward. The first motor 51 is arranged on the top of the reduction gear box 511 and connected to the power input port of the reduction gear box 511. The upper end of the transmission shaft 512 is connected to the power output port of the reduction gear box 511 and the lower end is connected to the shaft body 31 of the stirring shaft 3. The first motor 51 drives the stirring shaft 3 to rotate through the reduction gear box 511 and the transmission shaft 512 in turn, thereby realizing the rotation control of the stirring shaft 3 by the first rotation drive mechanism.

[0037] Reference Figures 1 to 4Taking into account that the leached residue can react more fully with solvents such as sulfuric acid and hydrogen peroxide if it is broken during the re-immersion process, and also considering the need to prevent the broken leached residue from directly entering the filter cartridge 32, the recovery device of the present application also makes the following optimizations. Specifically, the lower end of the shaft body 31 of the stirring shaft 3 is vertically telescopically provided with a core body 61, and a first telescopic drive mechanism is provided in the shaft body 31 to control the extension and contraction of the core body 61. The length of the core body 61 is greater than or equal to the length of the filter cartridge 32, and the outer diameter of the core body 61 is equal to the inner diameter of the filter cartridge 32, so that when the first telescopic drive mechanism controls the core body 61 to be fully extended, the outer wall of the core body 61 can close the filter pores of the filter cartridge 32. Furthermore, the outer wall of the core body 61 is radially telescopically provided with multiple rods 62, and a second telescopic drive mechanism is provided inside the core body 61 to control the extension and contraction of the rods 62. The diameter of the rods 62 is equal to the diameter of the filter pores of the filter cartridge 32. When the core body 61 is extended into the filter cartridge 32, the rods 62 are used to extend outside the filter pores. With the above arrangement, when the leached residue is re-soaked, the core 61 can be first extended into the filter cartridge 32 to close the filter holes, and then the rod 62 can be extended out of the core 61, and the stirring shaft 3 can be rotated rapidly, thereby utilizing the rod 62 to improve the crushing effect of the leached residue while preventing the crushed leached residue from directly entering the filter cartridge 32. In addition, the extension of the rod 62 into the filter hole can also play a snap-fitting effect, making the relative position between the core 61 and the filter cartridge 32 more stable, and when filtering the leachate, the extension and contraction of the rod 62 can be used to dredge the filter holes of the filter cartridge 32 if necessary.

[0038] Reference Figure 3 and Figure 4 In this embodiment, the first telescopic drive mechanism and the second telescopic drive mechanism are respectively the first electric cylinder 71 and the second electric cylinder 72. A battery 73 is also provided in the shaft body 31, and the battery 73 is used to power the first electric cylinder 71 and the second electric cylinder 72.

[0039] Reference Figures 1 to 4The drain channel 21 is L-shaped, with the upper end of the drain channel 21 vertically connected to the bottom surface of the soaking tank 1, and the lower end of the drain channel 21 horizontally connected to the outer wall of the soaking tank 1. A groove is defined between the upper end of the drain channel 21 and the bottom surface of the soaking tank 1. The width of the groove is greater than the width of the drain channel 21. The drain cover 22 is embedded in the groove and uses the liquid pressure of the soaking tank 1 to seal the upper end of the drain channel 21. Furthermore, the groove is a rectangular groove, and the drain cover 22 is designed to correspond to the shape of the groove. To facilitate opening the drain cover 22, a first threaded hole 81 is defined at the lower end of the core 61, and a second threaded hole 82 is defined at the upper end of the drain cover 22. The first threaded hole 81 and the second threaded hole 82 are of the same size and are continuous. A screw 83 is threadedly connected to the first threaded hole 81. A second rotary drive mechanism is provided within the core 61. The second rotary drive mechanism is telescopically connected to the screw 83 and is used to control the rotation of the screw 83. After the leached residue is stirred and re-immersed, the second rotary drive mechanism controls the screw 83 to rotate out. The rotated screw 83 connects the first threaded hole 81 and the second threaded hole 82, so that when the core 61 retracts, it can simultaneously open the filter cartridge 32 and the drain channel 21, quickly adjusting the immersion tank 1 from the immersion state to the drainage state. If it is necessary to replace the drain cover 22, the core 61 is re-extended and the screw 83 is rotated. In this embodiment, the second rotary drive mechanism is the second motor 52, and the battery 73 also powers the second motor 52.

[0040] Reference Figure 1 and Figure 2 , a slider module 9 is also provided on the mounting frame 4, and a first rotary drive mechanism is provided on the slider module 9. The slider module 9 controls the first rotary drive mechanism to perform reciprocating motion in the transverse direction, so that the stirring shaft 3 rotates in the immersion tank 1 while also moving laterally, thereby improving the stirring efficiency. The principle and structure of the slider module 9 are prior art and will not be described in detail. Furthermore, in order to enable the stirring shaft 3 to rotate and move laterally more smoothly when abutting against the bottom of the immersion tank 1, a ball 33 is provided at the bottom of the filter barrel 32 of the stirring shaft 3, and the lower end of the stirring shaft 3 abuts against the bottom surface of the immersion tank 1 through the ball 33, thereby improving the smoothness of the movement. It should be noted that the gap between the lower end of the stirring shaft 3 and the bottom surface of the immersion tank 1 needs to be less than or equal to the pore size of the filter pores of the filter barrel 32 to avoid reducing the filtration effect of the leachate.

[0041] This embodiment also discloses a recycling method based on extracting lithium battery powder.

[0042] Reference Figures 1 to 4 The recovery method based on lithium battery powder extraction includes the following steps:

[0043] S1: closing the drainage channel 21 and leaching the first leachate and the first leach residue in the immersion tank 1;

[0044] S2: Open the drainage channel 21, filter out the first leachate, and extract and remove impurities from the first leachate to obtain a battery-grade nickel-cobalt-manganese solution;

[0045] S3: The drainage channel 21 is closed, and the first rotary drive mechanism drives the stirring shaft 3 to rotate, and then the stirring shaft 3 stops rotating, and the second leachate and the second leach residue are leached in the immersion tank 1;

[0046] S4: opening the drainage channel 21, filtering out the second leachate, removing impurities from the second leachate and filtering to obtain iron-aluminum slag;

[0047] S5: Repeat step S3 to leach a third leachate and a third leach residue in the leaching tank 1;

[0048] S6: Open the drainage channel 21, filter out the third leachate, and use the third leachate residue as battery-grade graphite raw material.

[0049] Furthermore, when the leachate is filtered out, the stirring shaft 3 keeps rotating, making it easier to filter out the leachate, and the rotation speed of the stirring shaft 3 in the stirring state is greater than the rotation speed of the stirring shaft 3 in the filtering state.

[0050] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of this application. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A recovery device based on lithium battery powder extraction, characterized by: The invention comprises a soaking tank (1), wherein the bottom of the soaking tank (1) is provided with a drainage channel (21) and a drainage cover (22) located at the upper end of the drainage channel (21); a first rotary drive mechanism and a stirring shaft (3) connected to the first rotary drive mechanism are mounted on the soaking tank (1); the stirring shaft (3) is vertically arranged in the soaking tank (1); the first rotary drive mechanism controls the stirring shaft (3) to rotate around a vertical axis; the stirring shaft (3) comprises a shaft body (31) and a filter cartridge (32) arranged at the lower end of the shaft body (31); the filter cartridge (32) is provided with a plurality of filter holes; the lower end of the filter cartridge (32) abuts against the bottom of the soaking tank (1); the filter cartridge (32) is vertically aligned with the upper end of the drainage channel (21).

2. A recovery device based on extracting lithium battery powder according to claim 1, characterized in that: The upper end of the drainage channel (21) is vertically connected to the bottom surface of the soaking pool (1), and the lower end of the drainage channel (21) is horizontally connected to the outer wall of the soaking pool (1). An embedded groove is provided between the upper end of the drainage channel (21) and the bottom surface of the soaking pool (1), and the width of the embedded groove is greater than the width of the drainage channel (21). The drainage cover (22) is embedded in the embedded groove.

3. The recovery device for lithium battery powder according to claim 2, characterized in that: A core body (61) is vertically telescopically provided at the lower end of the shaft body (31) of the stirring shaft (3); a first telescopic drive mechanism for controlling the telescopic movement of the core body (61) is provided in the shaft body (31); the length of the core body (61) is greater than or equal to the length of the filter cartridge (32); and the outer diameter of the core body (61) is equal to the inner diameter of the filter cartridge (32).

4. The recovery device for lithium battery powder according to claim 3, characterized in that: The outer wall of the core (61) is provided with a plurality of rods (62) that are telescopically arranged along the radial direction. A second telescopic driving mechanism for controlling the telescopic movement of the rods (62) is provided inside the core (61). The diameter of the rods (62) is equal to the diameter of the filter holes of the filter cartridge (32). When the core (61) is extended into the interior of the filter cartridge (32), the rods (62) are used to extend out of the filter holes.

5. The recovery device for lithium battery powder according to claim 4, characterized in that: A slider module (9) is provided on the top of the soaking tank (1); the first rotary drive mechanism is provided on the slider module (9); and the slider module (9) controls the first rotary drive mechanism to perform reciprocating motion in the lateral direction.

6. The recovery device for lithium battery powder according to claim 4, characterized in that: A first threaded hole (81) is provided at the lower end of the core body (61), the embedding groove is a rectangular groove, the drain cover (22) is a rectangular cover, a second threaded hole (82) is provided at the upper end of the drain cover (22), the first threaded hole (81) and the second threaded hole (82) are of the same size and are continuously provided, a screw rod (83) is connected to the inner thread of the first threaded hole (81), a second rotation drive mechanism is provided in the core body (61), the second rotation drive mechanism is telescopically connected to the screw rod (83) and is used to control the rotation of the screw rod (83).

7. The recovery device for lithium battery powder according to claim 5, characterized in that: A ball bearing (33) is provided at the bottom of the filter cylinder (32), and the lower end of the stirring shaft (3) abuts against the bottom surface of the soaking tank (1) through the ball bearing (33).

8. A recycling method based on extracting lithium battery powder, using the recycling device according to claim 1, characterized in that: The following steps are involved: S1: closing the drainage channel (21) and leaching a first leachate and a first leach residue in the immersion tank (1); S2: opening the drainage channel (21), filtering out the first leachate, extracting and removing impurities from the first leachate to obtain a battery-grade nickel-cobalt-manganese solution; S3: the drainage channel (21) is closed, the first rotary drive mechanism drives the stirring shaft (3) to rotate, and then the stirring shaft (3) stops rotating, and a second leachate and a second leach residue are leached in the immersion tank (1); S4: opening the drainage channel (21), filtering out the second leachate, removing impurities from the second leachate and filtering to obtain iron-aluminum slag; S5: repeating step S3 to leach a third leachate and a third leach residue in the leaching tank (1); S6: opening the drainage channel (21), filtering out the third leaching liquid, and using the third leaching residue as a battery-grade graphite raw material.

9. The method for recycling lithium battery powder according to claim 8, characterized in that: In S3, the first rotary drive mechanism drives the stirring shaft (3) to rotate, so that the stirring shaft (3) is in a stirring state. When the second leachate or the third leachate is filtered out, the stirring shaft (3) keeps rotating, and the rotation speed of the stirring shaft (3) in the stirring state is greater than the rotation speed of the stirring shaft (3) when the second leachate or the third leachate is filtered out.

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