Battery graphite negative electrode material recovery device

Abstract

The utility model relates to the technical field of battery recovery, in particular to a battery graphite cathode material recovery device which comprises a separation tank body, the lower end of the separation tank body is communicated with the lower end of a dilution tank, and the upper end of the dilution tank is communicated with the lower end of a continuous overflow filtering device. The upper end of the continuous overflow filtering device is communicated with an inlet of the airflow pressurizing device, and an outlet of the airflow pressurizing device is communicated with the upper end of the separation tank body. According to the utility model, firstly, the separation tank body is used for separating crushed graphite and copper ions in copper foil, then the continuous overflow filtering device is used for separating graphite with smaller particle size in a leaching solution again, and the recycling of the leaching solution is realized through the pressurizing device, so that the separation efficiency of the graphite and the copper foil is improved, and meanwhile, the amount of waste liquid is reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery recycling technology, specifically to a battery graphite anode material recycling device. Background Technology

[0002] Lithium-ion batteries are a type of rechargeable battery that primarily functions by the movement of lithium ions between the positive and negative electrodes: during charging, Li... + Lithium-ion batteries de-intercalate from the positive electrode, pass through the electrolyte, and intercalate into the negative electrode, which is then in a lithium-rich state; the process is reversed during discharge. With its advantages of high energy density, low self-discharge rate, fast charging speed, and long cycle life, lithium-ion batteries have become the core energy carrier for modern electronic devices and new energy vehicles. The core components of a lithium-ion battery include the positive electrode, negative electrode, electrolyte, and separator. The active material of the positive electrode is generally lithium manganese oxide, lithium cobalt oxide, or lithium nickel cobalt manganese oxide, and the conductive current collector uses electrolytic aluminum foil with a thickness of 10-20 μm. The active material of the negative electrode is generally graphite or carbon with a similar graphite structure, and the conductive current collector uses electrolytic copper foil with a thickness of 7-15 μm. In recent years, with the rapid development of electronic products and new energy vehicles, the use of lithium-ion batteries has increased dramatically, and how to dispose of the large number of retired lithium-ion batteries has become an urgent problem to be solved.

[0003] Dry and wet recycling are the two main methods currently used to treat retired lithium-ion batteries. Dry recycling mainly includes mechanical sorting and high-temperature pyrolysis. Mechanical sorting utilizes the differences in physical properties of different battery components, using crushing and sieving to coarsely classify them. However, due to the unique structure of lithium-ion batteries, the active materials and current collectors are tightly bonded, making complete metal separation and recovery difficult. High-temperature pyrolysis removes the binder through high-temperature incineration, separating the materials. The metals are oxidized, reduced, and decomposed into gaseous substances that volatilize and are then collected. While simple, high-temperature pyrolysis is energy-intensive. Wet recycling uses acidic or alkaline solutions as a medium to transfer metal ions to a leachate, which is then extracted using various methods. To ensure sufficient contact between the electrode material and the leachate, the electrode material is usually pulverized before being placed in the leachate for treatment. Because graphite anode materials have a low heavy metal content and are prone to graphite powder coating copper foil after pulverization, this method not only has low separation efficiency but also generates a large amount of waste liquid. Utility Model Content

[0004] To address the technical problems of low separation efficiency and large waste liquid generation in the wet recycling process of graphite anode materials for lithium-ion batteries, this utility model provides a battery graphite anode material recycling device. First, a separation tank is used to separate the crushed graphite from the copper ions in the copper foil. Then, a continuous overflow filtration device is used to further separate the smaller graphite particles in the leachate. Finally, a pressurization device is used to enable the reuse of the leachate, thereby improving the separation efficiency of graphite and copper foil while reducing the amount of waste liquid.

[0005] The technical solution of this utility model is as follows:

[0006] A battery graphite anode material recycling device includes a separation tank, the lower end of which is connected to the lower end of a dilution tank, the upper end of which is connected to the lower end of a continuous overflow filter, the upper end of which is connected to the inlet of an airflow booster device, and the outlet of which is connected to the upper end of the separation tank.

[0007] The separation tank has a separation chamber inside, and a separation core is installed inside the separation chamber. The upper end of the separation core is flush with the upper end of the separation chamber. The side of the separation core has a mesh structure. A collection plate is provided at the bottom of the separation core. An annular collection groove is provided on the upper surface of the collection plate. The lower bottom surface of the separation core is rotatably connected to the upper bottom surface of the separation chamber.

[0008] Furthermore, the continuous overflow filtration device includes at least two overflow filter tanks connected in series, which can perform multi-stage filtration on the diluted leachate discharged from the dilution tank to remove residual graphite from the diluted leachate.

[0009] Furthermore, the overflow filter tanks are equipped with a filter medium inside. Overflow filter tanks connected in series can use the same filter medium or different filter media. The filter medium can be a porous mesh structure, membrane structure, granular structure, or block structure. The dilution tank is equipped with a stirring device, preferably a mechanical stirring paddle, which can be used to mix the leachate and water in the dilution tank evenly.

[0010] Furthermore, the airflow inlet of the airflow booster is connected to the gas source. The airflow booster is preferably a jet pump, and the gas source is one or more of nitrogen, argon, or helium.

[0011] Furthermore, the separation chamber is a cylindrical structure with a removable sealing cap at the top. The cylindrical structure is adapted to the separation core to ensure that the separation core can rotate freely within the separation chamber.

[0012] Furthermore, the detachable sealing cover is equipped with a crushed material feed pipe, which is connected to the separation core. The outlet of the crushed material feed pipe is located above the separation core, and the diameter of the inlet of the crushed material feed pipe is not less than the diameter of the outlet of the crushed material feed pipe.

[0013] Furthermore, there are no fewer than two annular collection troughs, and the distance between two adjacent annular collection troughs may be equal or unequal.

[0014] Furthermore, the annular collecting groove is a V-shaped groove arranged concentrically, used to collect the graphite powder remaining in the separation core. The center of the annular collecting groove is located at the center of the upper surface of the collecting plate.

[0015] Furthermore, the capacity of the outer annular collecting trough is greater than that of the inner annular collecting trough. During the rotation of the separating core, graphite powder of different particle sizes can enter different annular collecting troughs under centrifugal force.

[0016] The beneficial effects of this utility model are as follows:

[0017] This invention provides a battery graphite anode material recycling device. The graphite anode material and leachate (concentrated sulfuric acid) are added to a separation core. The centrifugal force generated by the rotation of the separation core within the separation chamber promotes the separation of graphite powder from copper foil, increasing the leaching rate of copper from the copper foil. Because the sides of the separation core have a mesh structure, graphite powder insoluble in the leachate can remain in the separation core and eventually fall into the annular collection trough at the bottom of the separation core, achieving graphite powder recycling. The leachate discharged from the separation tank is diluted with water in a dilution tank. The viscosity of the leachate is reduced to obtain a diluted leachate. The diluted leachate enters a continuous overflow filter for staged filtration to further remove smaller graphite particles. The upper end of the continuous overflow filter is connected to the inlet of an airflow booster, and the outlet of the airflow booster is connected to the upper end of the separation tank. The pressure of the diluted leachate is increased by the airflow booster. The diluted leachate mixed with airflow can be used to flush the mesh structure of the separation core, flushing the graphite attached to the mesh structure onto the collection plate, thus realizing the reuse of the leachate and reducing the amount of waste liquid. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the battery graphite anode material recycling device in Example 1.

[0020] Figure 2 This is a top view of the collection plate in Example 1.

[0021] Figure 3This is a cross-sectional view of the collecting plate in Example 1.

[0022] In the figure, 1-separation tank, 2-crushed material feed pipe, 3-separation core, 4-collection plate, 5-drive motor, 6-drain port, 7-first overflow tank, 8-second overflow tank, 9-jet pump, 10-annular collection tank, 11-dilution tank. Detailed Implementation

[0023] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0024] Example 1

[0025] A battery graphite anode material recycling device includes a separation tank 1. The separation tank 1 has a cylindrical separation chamber inside. The upper end of the separation chamber is equipped with a removable sealing cover, and the removable sealing cover is equipped with a pulverized material feed pipe. A drive motor 5 is located at the center of the bottom of the separation chamber. The upper output end of the drive motor 5 is connected to the center of the bottom lower surface of the separation core 3. The drive motor 5 can drive the bottom of the separation core 3 to rotate. A collection plate 4 is provided at the bottom of the separation core 3. The separation core 3 is located inside the separation chamber. The upper surface of the collection plate 4 is provided with four annular collection grooves 10 at equal intervals with the center. The cross-section of the annular collection grooves 10 is V-shaped. The capacity of the annular collection grooves 10 decreases from the farthest to the nearest center. The separation chamber is adapted to the separation core 3 to ensure that the separation core 3 can rotate freely in the separation chamber. The side of the separation core 3 is a mesh structure. The upper end of the separation core 3 is flush with the upper end of the separation chamber. The crushed material feed pipe is connected to the separation core. The outlet of the crushed material feed pipe is located above the separation core. The diameter of the inlet of the crushed material feed pipe is equal to the diameter of the outlet of the crushed material feed pipe.

[0026] The drain port 6 at the lower end of the separation tank 1 is connected to the lower end of the dilution tank 11. The upper end of the dilution tank 11 is connected to the lower end of the first overflow filter tank 7. The upper end of the first overflow filter tank 7 is connected to the lower end of the second overflow filter tank 8. The upper end of the second overflow filter tank 8 is connected to the inlet of the jet pump 9. The outlet of the jet pump 9 is connected to the liquid inlet at the upper end of the separation tank 1. The gas flow inlet of the jet pump 9 is connected to a nitrogen source. A filter screen is installed inside the first overflow filter tank 7. Porous ceramic particles are installed inside the second overflow filter tank 8. A mechanical stirring paddle is installed inside the dilution tank 11.

[0027] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery graphite negative electrode material recovery device comprising a separation tank body, characterized in that, The lower end of the separation tank body is connected with the lower end of the dilution tank, the upper end of the dilution tank is connected with the lower end of the continuous overflow filter device, the upper end of the continuous overflow filter device is connected with the inlet of the airflow pressure boosting device, and the outlet of the airflow pressure boosting device is connected with the upper end of the separation tank body; The separation tank body is internally provided with a separation cavity, the separation cavity is internally provided with a separation core body, the upper end of the separation core body is flush with the upper end of the separation cavity, the side surface of the separation core body is a mesh structure, the bottom of the separation core body is provided with a collection plate, the upper surface of the collection plate is provided with an annular collection groove, and the bottom lower surface of the separation core body is rotationally connected with the bottom upper surface of the separation cavity.

2. The device for recycling battery graphite negative electrode material according to claim 1, characterized in that, The continuous overflow filter device comprises at least two overflow filter tanks connected in series.

3. The device for recycling battery graphite negative electrode material according to claim 2, characterized in that, The overflow filter tank is internally provided with a filter medium, and the dilution tank is internally provided with a stirring device.

4. The device for recycling battery graphite negative electrode material according to claim 1, characterized in that, The airflow inlet of the airflow pressure boosting device is connected with a gas source.

5. The device for recycling battery graphite negative electrode material according to claim 1, characterized in that, The separation cavity is a cylindrical structure with a detachable sealing cover arranged at the upper end.

6. The device for recycling battery graphite negative electrode material according to claim 5, characterized in that, A crushing material feeding pipe is arranged on the detachable sealing cover and is connected with the separation core body.

7. The device for recycling battery graphite negative electrode material according to claim 1, characterized in that, The number of the annular collection grooves is not less than two.

8. The device for recycling battery graphite negative electrode material according to claim 7, characterized in that, The annular collection grooves are V-shaped grooves arranged with the same center.

9. The battery graphite negative electrode material recovery device of claim 8, wherein, The capacity of the outer annular collection groove is greater than that of the inner annular collection groove.

Images