Device for recycling waste anti-oxidation liquid of lithium battery copper foil and method for using the same

Abstract

The present invention discloses a recycling device for waste anti-oxidation liquid of lithium battery copper foil and a method for using the same, including: a left vertical cavity; a right vertical cavity; a horizontal cavity; a side plate, wherein the side plate, the left vertical cavity, the right vertical cavity and the horizontal cavity form a receiving cavity; a first horizontal partition; a drainage hole, wherein the drainage hole is opened in the center of the first horizontal partition; a second horizontal partition; a rotating shaft, wherein the bottom of the rotating shaft is rotatably connected to the center of the second horizontal partition; a blade; a first one-way valve; a third horizontal partition; a fourth horizontal partition; a compression spring, wherein the compression spring is fixedly connected between the fourth horizontal partition and the second horizontal partition; a liquid discharge port; and a second one-way valve. The beneficial effects of the present invention are that the structure is compact, and the alkali treatment, storage and chromium ion supplementation of waste anti-oxidation liquid are integrated in one device, and no pipeline connection is required for circulation, thereby reducing the number of pumps, reducing energy consumption, shortening the process and occupying a small area.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery copper foil, and in particular to a device for recycling waste anti-oxidation liquid of lithium battery copper foil and a method for using the same. Background Art

[0002] The manufacturing process of lithium battery copper foil is generally raw material processing → copper dissolution → raw foil → slitting. In the raw foil process, the electrolytic copper foil is first formed on the cathode roller, and then rolled up by peeling it onto the raw foil machine. During the rolling process, the electrolytic copper foil is exposed to the air and is easily oxidized, which will cause the surface of the copper foil to discolor, reduce the adhesion of the copper foil, and affect the performance of the terminal product. Therefore, customers have higher and higher requirements for the quality of electrolytic copper foil, and propose that the surface of the electrolytic copper foil needs to be flawless and non-oxidized before shipment, and avoid oxidation of the electrolytic copper foil during storage and use. Therefore, the electrolytic copper foil must also be treated with anti-oxidation in the raw foil process to ensure that the produced electrolytic copper foil is not oxidized during use and storage. At present, during the use of the anti-oxidation liquid in the industry, as the pH value is lower than the standard value and the hexavalent chromium content in the solution decreases over time, the anti-oxidation liquid will be treated as waste liquid. The waste liquid contains heavy metal chromium ions. The waste liquid treatment process is complicated and the cost is high. In addition, the chromium ions in the solution cannot be reused, resulting in a waste of resources.

[0003] Existing recycling processes for waste anti-oxidation liquid of lithium battery copper foil include: Figure 1 As shown, it includes a waste liquid tank, a waste liquid modulation tank, a storage tank, an anti-oxidation liquid preparation tank, an agitator, various valves and pumps. The waste liquid in the anti-oxidation tank on the foil machine flows back to the waste liquid tank of the waste anti-oxidation liquid recycling system, and the waste liquid in the waste liquid tank is sent to the waste liquid modulation tank to add alkaline additives for modulation, and then sent to the storage tank for buffering. The solution in the storage tank is then sent to the anti-oxidation liquid preparation tank for chromium ion preparation, and the prepared anti-oxidation liquid is then transported back. The entire waste anti-oxidation liquid recycling system is a circulation system, which maintains the stability of pH and hexavalent chromium ions in the solution to achieve a closed-loop reuse effect. However, the system requires the installation of multiple tanks, and multiple pipelines are required to connect these tanks, which requires a high floor space and a long waste liquid circulation path.

[0004] Another example is the Chinese invention patent authorization announcement number CN111472005B, which discloses an acidic environmentally friendly anti-oxidation process for electrolytic copper foil, in which an overflow tank is provided next to the anti-oxidation treatment tank to receive the anti-oxidation liquid overflowing from the anti-oxidation treatment tank; the overflow tank is connected to the liquid storage tank through a pipeline to recover the overflowed anti-oxidation liquid into the liquid storage tank. This patent directly recycles the overflowed anti-oxidation liquid and does not involve waste liquid recycling treatment. Summary of the invention

[0005] The problem to be solved by the present invention is that the existing recycling process of waste anti-oxidation liquid of lithium battery copper foil is long and occupies a lot of space. Therefore, an integrated recycling device for waste anti-oxidation liquid of lithium battery copper foil with small footprint and short processing process and a method for using the same are provided.

[0006] The technical solution of the present invention is: a device for recycling waste anti-oxidation liquid of lithium battery copper foil, comprising: a left vertical cavity; a right vertical cavity; a horizontal cavity, the two ends of the horizontal cavity are respectively connected to the bottom of the left vertical cavity and the right vertical cavity; a side plate, the two sides of the side plate are fixedly connected between the left vertical cavity and the right vertical cavity, and the bottom of the side plate is fixedly connected to the side of the horizontal cavity, so that a accommodating cavity is surrounded by the side plate, the left vertical cavity, the right vertical cavity and the horizontal cavity; a first horizontal partition, the first horizontal partition is sealed and installed above the accommodating cavity; a drainage hole, the drainage hole is opened in the center of the first horizontal partition; a second horizontal partition, the second horizontal partition is slidably matched in the accommodating cavity located below the first horizontal partition; a rotating shaft, the bottom of the rotating shaft is rotatably connected to the center of the second horizontal partition , the top of the rotating shaft extends out from the drainage hole and fits with the clearance of the drainage hole; the blade, the blade is fixedly connected to the surface of the rotating shaft; the first one-way valve, the first one-way valve is opened on the inner wall of the left vertical cavity and is located between the first horizontal partition and the second horizontal partition; the third horizontal partition, the third horizontal partition is fixedly connected in the left vertical cavity and is located below the second horizontal partition; the fourth horizontal partition, the fourth horizontal partition is fixedly connected in the accommodating cavity and is located below the third horizontal partition; the compression spring, the compression spring is fixedly connected between the fourth horizontal partition and the second horizontal partition; the drain port, the drain port is opened on the inner wall of the left vertical cavity and is located between the third horizontal partition and the fourth horizontal partition; the second one-way valve, the second one-way valve is opened on the inner wall of the right vertical cavity and is located below the fourth horizontal partition.

[0007] In the above solution, the upper surface of the rotating shaft is provided with threads.

[0008] The periphery of the drainage hole in the above solution has a flange bent downward.

[0009] The compression springs in the above solution are evenly distributed between the second horizontal partition plate and the fourth horizontal partition plate with the rotating shaft as the center.

[0010] An improvement of the above solution is that baffles located above the second one-way valve are staggeredly distributed in the right vertical cavity.

[0011] The method for using a device for recycling waste anti-oxidation liquid of lithium battery copper foil comprises the following steps: injecting alkali liquid into a left vertical cavity, so that the left vertical cavity above a third horizontal partition forms an alkali liquid containing cavity, injecting chromium supplementing liquid between a fourth horizontal partition and a horizontal cavity to form a chromium supplementing liquid containing cavity; injecting waste anti-oxidation liquid of lithium battery copper foil into the containing cavity, so that the waste anti-oxidation liquid of lithium battery copper foil enters between a first horizontal partition and a second horizontal partition from a drainage hole, opening a first one-way valve, so that the alkali liquid enters between the first horizontal partition and the second horizontal partition, the alkali liquid impacts the blades to rotate, so that the alkali liquid and the waste anti-oxidation liquid of lithium battery copper foil are fully mixed, as the liquid levels in the first horizontal partition and the second horizontal partition rise, the second horizontal partition moves downward, the compression spring is compressed, and the mixed liquid of the alkali liquid and the waste anti-oxidation liquid of lithium battery copper foil enters the left vertical cavity and the horizontal cavity from a liquid discharge port, and then enters the right vertical cavity, opening the second one-way valve, injecting the chromium supplementing liquid into the right vertical cavity to form a new anti-oxidation liquid, and finally guiding the new anti-oxidation liquid away from the top of the right vertical cavity.

[0012] The beneficial effects of the present invention are that it has a compact structure and integrates the alkali treatment, storage and chromium ion supplementation of the waste anti-oxidation liquid in one device, without the need for pipeline connection and circulation, thus reducing the number of pumps, lowering energy consumption, shortening the process and occupying a small area. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the existing recycling process of waste anti-oxidation liquid for lithium battery copper foil;

[0014] Figure 2 It is a schematic diagram of a device for recycling waste anti-oxidation liquid of lithium battery copper foil of the present invention;

[0015] Figure 3 yes Figure 2 Schematic diagram of the usage status;

[0016] Figure 4 yes Figure 1 A three-dimensional perspective diagram of

[0017] In the figure, 1, waste liquid tank, 2, waste liquid preparation tank, 3, storage tank, 4, anti-oxidation liquid preparation tank, 5, agitator, 6, valve, 7, pump, 8, left vertical cavity, 9, right vertical cavity, 10, horizontal cavity, 11, side plate, 12, first horizontal partition, 13, drainage hole, 14, second horizontal partition, 15, rotating shaft, 16, blade, 17, first one-way valve, 18, third horizontal partition, 19, fourth horizontal partition, 20, compression spring, 21, discharge port, 22, second one-way valve, 23, baffle. Implementation

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] like Figure 2 , 4 As shown, the recycling device for waste anti-oxidation liquid of lithium battery copper foil comprises: a left vertical cavity 8; a right vertical cavity 9; a horizontal cavity 10, wherein the two ends of the horizontal cavity are respectively connected to the bottom of the left vertical cavity and the right vertical cavity; a side plate 11, wherein the two sides of the side plate are fixedly connected between the left vertical cavity and the right vertical cavity, and the bottom of the side plate is fixedly connected to the side of the horizontal cavity, so that a receiving cavity is surrounded by the side plate, the left vertical cavity, the right vertical cavity and the horizontal cavity; a first horizontal partition 12, wherein the first horizontal partition is sealed and installed above the receiving cavity, and the first horizontal partition divides the receiving cavity into two parts, an upper part and an lower part; a drainage hole 13, wherein the drainage hole is opened in the center of the first horizontal partition; a second horizontal partition 14, wherein the second horizontal partition is slidably fitted in the receiving cavity below the first horizontal partition, and the second horizontal partition again divides the receiving cavity into two parts, an upper part and an lower part; a rotating shaft 15, wherein the bottom of the rotating shaft is rotatably connected to the center of the second horizontal partition, and the top of the rotating shaft extends out of the drainage hole and is gap-fitted with the drainage hole; a leaf The blade 16 is fixedly connected to the surface of the rotating shaft; the first one-way valve 17 is provided on the inner wall of the left vertical cavity and is located between the first horizontal partition and the second horizontal partition, and the opening direction of the first one-way valve is from the left vertical cavity to the accommodating cavity; the third horizontal partition 18 is fixedly connected to the left vertical cavity and is located below the second horizontal partition; the fourth horizontal partition 19 is fixedly connected to the accommodating cavity and is located below the third horizontal partition, and the fourth horizontal partition and the horizontal cavity are used to accommodate the chromium replenishing liquid; the compression spring 20 is fixedly connected between the fourth horizontal partition and the second horizontal partition, and the compression spring is used to provide an upward restoring force to the second horizontal partition; the drain port 21 is provided on the inner wall of the left vertical cavity and is located between the third horizontal partition and the fourth horizontal partition; the second one-way valve 22 is provided on the inner wall of the right vertical cavity and is located below the fourth horizontal partition, and the opening direction of the second one-way valve is from the accommodating cavity to the right vertical cavity.

[0020] As a preferred example of the present invention, a thread is provided on the upper surface of the rotating shaft. When the waste anti-oxidation liquid of the lithium battery copper foil enters the bottom of the first horizontal partition from the drainage hole, a vortex is formed between the rotating shaft and the drainage hole. The vortex enters between the first horizontal partition and the second horizontal partition and dissipates outward, fully contacting with the alkaline solution discharged from the first one-way valve, and also providing power for the rotation of the blades.

[0021] As a preferred example of the present invention, the periphery of the drainage hole has a downwardly bent flange, which will drain the waste anti-oxidation liquid of the lithium battery copper foil to the surface of the shaft. When the shaft rotates, centrifugal force is applied to the waste anti-oxidation liquid of the lithium battery copper foil. If the surface of the shaft is provided with threads, the centrifugal effect will be better.

[0022] In the present invention, the compression spring may be located at the center of the accommodating cavity, or there may be multiple compression springs, which are evenly distributed between the second horizontal partition and the fourth horizontal partition with the rotating shaft as the center, to guide the second horizontal partition to descend and ascend smoothly.

[0023] As a preferred example of the present invention, baffles 23 located above the second one-way valve are staggeredly distributed in the right vertical cavity, and the obstruction of the baffles ensures that the chromium replenishing solution and the lithium battery copper foil waste anti-oxidation solution are fully mixed.

[0024] The method for using the device for recycling waste anti-oxidation liquid of lithium battery copper foil comprises the following steps: injecting alkaline solution into the left vertical cavity, the left vertical cavity above the third horizontal partition forms an alkaline solution receiving cavity, injecting chromium supplementing liquid between the fourth horizontal partition and the horizontal cavity, forming a chromium supplementing liquid receiving cavity; injecting waste anti-oxidation liquid of lithium battery copper foil into the receiving cavity, the waste anti-oxidation liquid of lithium battery copper foil enters between the first horizontal partition and the second horizontal partition from the drainage hole, opening the first one-way valve, the alkaline solution enters between the first horizontal partition and the second horizontal partition, the alkaline solution impacts the blade to rotate, driving the alkaline solution and the waste anti-oxidation liquid of lithium battery copper foil to be fully mixed, and along with the first horizontal partition and the second horizontal partition, the alkaline solution is discharged from the first horizontal partition and the second horizontal partition. The liquid level in the partition rises, and the second horizontal partition moves downward. During the downward movement of the second horizontal partition, the rotating shaft rotates all the time, and the blades continue to stir the alkali solution and the waste anti-oxidation liquid of lithium battery copper foil. No external power source is required, which is energy-saving and environmentally friendly. The compression spring is compressed, and the mixture of the alkali solution and the waste anti-oxidation liquid of lithium battery copper foil enters the left vertical cavity and the horizontal cavity from the drain port, and then enters the right vertical cavity. The second one-way valve is opened, and the chromium supplement liquid is injected into the right vertical cavity to form a new anti-oxidation liquid. Finally, the new anti-oxidation liquid is led away from the top of the right vertical cavity. When the weight of the liquid above the second horizontal partition is reduced or even disappears, the compression spring pushes the second horizontal partition back to its original position.

Claims

1. A device for recycling waste anti-oxidation liquid of lithium battery copper foil, characterized by: include: A left vertical cavity (8); a right vertical cavity (9); a horizontal cavity (10), wherein the two ends of the horizontal cavity are respectively connected to the bottom of the left vertical cavity and the right vertical cavity; a side plate (11), wherein the two sides of the side plate are fixedly connected between the left vertical cavity and the right vertical cavity, and the bottom of the side plate is fixedly connected to the side of the horizontal cavity, so that a receiving cavity is surrounded by the side plate, the left vertical cavity, the right vertical cavity and the horizontal cavity; a first horizontal partition (12), wherein the first horizontal partition is sealingly installed above the receiving cavity; a drainage hole (13), wherein the drainage hole is opened in the center of the first horizontal partition; a second horizontal partition (14), wherein the second horizontal partition is slidably fitted in the receiving cavity located below the first horizontal partition; a rotating shaft (15), wherein the bottom of the rotating shaft is rotatably connected to the center of the second horizontal partition, and the top of the rotating shaft extends from the drainage hole. out and fit with the drainage hole gap; a blade (16), the blade is fixedly connected to the surface of the rotating shaft; a first one-way valve (17), the first one-way valve is opened on the inner wall of the left vertical cavity and is located between the first horizontal partition and the second horizontal partition; a third horizontal partition (18), the third horizontal partition is fixedly connected to the left vertical cavity and is located below the second horizontal partition; a fourth horizontal partition (19), the fourth horizontal partition is fixedly connected to the accommodating cavity and is located below the third horizontal partition; a compression spring (20), the compression spring is fixedly connected between the fourth horizontal partition and the second horizontal partition; a liquid discharge port (21), the liquid discharge port is opened on the inner wall of the left vertical cavity and is located between the third horizontal partition and the fourth horizontal partition; a second one-way valve (22), the second one-way valve is opened on the inner wall of the right vertical cavity and is located below the fourth horizontal partition.

2. The device for recycling waste anti-oxidation liquid of lithium battery copper foil according to claim 1, characterized in that: The upper surface of the rotating shaft is provided with threads.

3. The device for recycling waste anti-oxidation liquid of lithium battery copper foil according to claim 1, characterized in that: The periphery of the drainage hole is provided with a flange bent downward.

4. The device for recycling waste anti-oxidation liquid of lithium battery copper foil according to claim 1, characterized in that: The compression springs are evenly distributed between the second horizontal partition plate and the fourth horizontal partition plate with the rotating shaft as the center.

5. The device for recycling waste anti-oxidation liquid of lithium battery copper foil according to claim 1, characterized in that: Baffles (23) located above the second one-way valve are staggeredly distributed in the right vertical cavity.

6. The method for using the device for recycling waste anti-oxidation liquid for lithium battery copper foil according to any one of claims 1 to 5, characterized in that: The following steps are involved: Alkali solution is injected into the left vertical cavity, and the left vertical cavity above the third horizontal partition forms an alkali solution receiving cavity, and chromium supplementing liquid is injected between the fourth horizontal partition and the horizontal cavity to form a chromium supplementing liquid receiving cavity; The waste anti-oxidation liquid of lithium battery copper foil is injected into the containing cavity, and the waste anti-oxidation liquid of lithium battery copper foil enters between the first horizontal partition and the second horizontal partition from the drainage hole, the first one-way valve is opened, and the alkali solution enters between the first horizontal partition and the second horizontal partition. The alkali solution impacts the blades to rotate, driving the alkali solution and the waste anti-oxidation liquid of lithium battery copper foil to be fully mixed. As the liquid level in the first horizontal partition and the second horizontal partition rises, the second horizontal partition moves downward, the compression spring is compressed, and the mixture of the alkali solution and the waste anti-oxidation liquid of lithium battery copper foil enters the left vertical cavity and the horizontal cavity from the discharge port, and then enters the right vertical cavity. The second one-way valve is opened, and the chromium supplement liquid is injected into the right vertical cavity to form a new anti-oxidation liquid, and finally the new anti-oxidation liquid is led away from the top of the right vertical cavity.

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