A stripping device for lithium battery wet recovery

Abstract

The utility model discloses a kind of for lithium battery wet recovery's stripping device, specifically related to lithium battery recycling technical field, including stripping column, stirring device and cooling device, the bottom of stripping column is equipped with liquid inlet and gas inlet, the top of stripping column is equipped with liquid outlet, liquid inlet is used to pass in water and the mixture of load organic phase, gas inlet is used to pass in CO2 Or SO2 Gas, liquid outlet is used to discharge the mixed liquid in stripping column, cooling device is sleeved in the outer wall of stripping column and can cool stripping column, stirring device is located in stripping column and passes through the top of stripping column and is sealingly connected with stripping column, and stirring device can stir the mixture in stripping column. The utility model is simple in structure, can make stripping index maintain stable, improve recovery efficiency.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery recycling technology, and in particular to a back-extraction device for wet recycling of lithium batteries. Background Technology

[0002] Lithium, as the lightest known metal, possesses not only excellent electrical and thermal conductivity and a unique electrochemical potential, but also a powerful energy storage capacity. Lithium has become an indispensable key metallic material in modern technology industries. With the explosive growth of lithium battery applications and the continuous increase in the number of retired batteries, lithium extraction from spent lithium batteries has become an important way to replenish lithium resources.

[0003] Currently, the recovery of lithium from spent lithium batteries mainly employs three technical routes: direct recycling, pyrometallurgical recycling, and hydrometallurgical recycling. Direct recycling typically only allows for simple battery repair and struggles to achieve efficient separation of various core materials within the battery. Pyrometallurgical recycling converts the metal components in spent batteries into alloys or oxides through high-temperature smelting; while simple to operate, it suffers from significant drawbacks such as high energy consumption, heavy pollution, and low efficiency. Hydrometallurgical recycling dissolves valuable metals in the battery using chemical solutions, then uses separation and purification processes to convert the metal ions into high-purity products. Hydrometallurgical recycling achieves precise separation of different metals and produces products with high purity. Therefore, direct recycling and pyrometallurgical recycling are gradually being replaced by hydrometallurgical recycling. Hydrometallurgical recycling enables precise separation of different metals and produces products with high purity.

[0004] However, current wet recovery equipment still suffers from technical problems such as large fluctuations in back-extraction indicators, low recovery efficiency, and poor metal recovery rate. Utility Model Content

[0005] The purpose of this invention is to provide a back-extraction device for wet recycling of lithium batteries, which solves the problems existing in the prior art. It has a simple structure, can keep the back-extraction index stable, and improves the recycling efficiency.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] This utility model provides a back-extraction device for wet recycling of lithium batteries, including a back-extraction tower, a stirring device, and a cooling device. The back-extraction tower has a liquid inlet and a gas inlet at the bottom and a liquid outlet at the top. The liquid inlet is used to introduce a mixture of water and a loaded organic phase, the gas inlet is used to introduce CO2 or SO2 gas, and the liquid outlet is used to discharge the mixed liquid in the back-extraction tower. The cooling device is sleeved on the outer wall of the back-extraction tower and can cool the back-extraction tower. The stirring device is located inside the back-extraction tower and passes through the top of the back-extraction tower and is sealed to the back-extraction tower. The stirring device can stir the mixture in the back-extraction tower.

[0008] Preferably, a sieve plate is fixedly installed inside the back-extraction tower, and the sieve plate is evenly distributed with sieve holes.

[0009] Preferably, there are multiple sieve plates, which are spaced apart along the vertical direction of the stripping tower.

[0010] Preferably, the stirring device includes a stirring shaft and multiple layers of stirring blades. One end of the stirring shaft passes through the top of the back-extraction tower and is sealed and fixedly connected to the back-extraction tower. The other end of the stirring shaft is connected to the multiple layers of stirring blades. The multiple layers of stirring blades are distributed at intervals along the axial direction of the stirring shaft, and a sieve plate is provided above each layer of stirring blades.

[0011] Preferably, the cooling device includes a cooling water jacket, a cooling water inlet pipe, and a cooling water outlet pipe. The cooling water jacket is fixedly sleeved outside the stripping tower. The cooling water inlet pipe is connected to and communicates with the bottom of the cooling water jacket, and the cooling water outlet pipe is connected to and communicates with the top of the cooling water jacket.

[0012] Preferably, it also includes a monitoring device connected to the back-extraction tower for monitoring the temperature of the back-extraction tower and the pH value of the solution inside the back-extraction tower.

[0013] Preferably, the monitoring device includes a temperature sensor and a pH detector.

[0014] Preferably, the liquid inlet is connected to the liquid inlet pipe, and the liquid inlet pipe includes a mixing pipe, a water inlet pipe and a loaded organic phase pipe. One end of the mixing pipe is connected to and communicates with the back-extraction tower, and the other end is connected to and communicates with the water inlet pipe and the loaded organic phase pipe respectively. A check valve is provided on the mixing pipe.

[0015] Preferably, the air inlet is connected to a CO2 or SO2 air inlet pipe, and a gas flow meter is installed on the CO2 or SO2 air inlet pipe.

[0016] Preferably, the liquid outlet is connected to the liquid outlet pipe, and the liquid outlet pipe is equipped with a back pressure valve.

[0017] The present invention achieves the following technical advantages over the prior art:

[0018] This invention provides a back-extraction device for wet recycling of lithium batteries, including a back-extraction tower, a stirring device, and a cooling device. The cooling device, fitted on the outer wall of the back-extraction tower, can stably maintain a low-temperature environment inside the back-extraction tower. The solubility of CO2 or SO2 in water increases exponentially with decreasing temperature. The low-temperature environment created by the cooling device increases the amount of CO2 or SO2 dissolved in the back-extraction system, allowing more CO2 or SO2 to participate in the pH adjustment process of the aqueous phase. Compared with the back-extraction process at conventional temperatures, the low-temperature back-extraction device, with its higher CO2 or SO2 solubility, not only allows the back-extraction reaction of metal ions transferring from the organic phase to the aqueous phase to be more complete, but also reduces back-extraction fluctuations caused by insufficient CO2 or SO2 dissolution. The stable reaction environment improves the efficiency and quality of metal ion separation and recovery in the wet recycling of lithium batteries. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments 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.

[0020] Figure 1 This is a schematic diagram of a back-extraction device used for wet recycling of lithium batteries.

[0021] In the diagram: 1-Reverse extraction tower; 2-Liquid inlet; 3-Gas inlet; 4-Liquid outlet; 5-Mixing pipe; 6-Water inlet pipe; 7-Loaded organic phase pipe; 8-Gas inlet pipe; 9-Liquid outlet pipe; 10-Gas flow meter; 11-Pressure relief valve; 12-Agitator shaft; 13-Agitator blades; 14-Cooling water jacket; 15-Cooling water inlet pipe; 16-Cooling water outlet pipe; 17-Temperature sensor; 18-pH detector; 19-Sieve plate; 20-Check valve. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] The purpose of this invention is to provide a back-extraction device for wet recycling of lithium batteries, which solves the problems existing in the prior art. It has a simple structure, can keep the back-extraction index stable, and improves the recycling efficiency.

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] This utility model provides a back-extraction device for the wet recovery of lithium batteries, such as... Figure 1 As shown, the system includes a back-extraction tower 1, a stirring device, and a cooling device. The back-extraction tower 1 has a liquid inlet 2 and a gas inlet 3 at the bottom, and a liquid outlet 4 at the top. The liquid inlet 2 is used to introduce a mixture of water and the loaded organic phase. The simultaneous injection of the aqueous phase and the loaded organic phase through the bottom liquid inlet 2 can promote rapid mixing of the two phases and reduce stratification. The gas inlet 3 is used to introduce CO2 or SO2 gas. The CO2 or SO2 gas diffuses through the bottom to form microbubbles, which increases the contact area with the liquid phase and improves the back-extraction efficiency. The liquid outlet 4 is used to discharge the mixed liquid in the back-extraction tower 1. The cooling device is fitted on the outer wall of the back-extraction tower 1 and can cool the back-extraction tower 1. The stirring device is located inside the back-extraction tower 1 and passes through the top of the back-extraction tower 1 and is sealed to the back-extraction tower 1. The stirring device can stir the mixture in the back-extraction tower 1. The cooling device installed on the outer wall of the back-extraction tower 1 can stably maintain the low-temperature environment inside the tower. The solubility of CO2 or SO2 in water increases exponentially with decreasing temperature. The low-temperature environment created by the cooling device increases the amount of CO2 or SO2 dissolved in the back-extraction system, allowing more CO2 or SO2 to participate in the pH adjustment process of the aqueous phase. Sufficient CO2 or SO2 dissolution provides a continuous and stable source of H2 for the back-extraction reaction. + Source, effectively strengthening H + The ability of metal ions to compete with the active sites of the extractant accelerates the dissociation of the "extractant-metal ion" coordination structure. Compared with the back-extraction process at conventional temperatures, the low-temperature back-extraction device, with its higher CO2 or SO2 solubility, not only allows the back-extraction reaction of metal ions to transfer from the organic phase to the aqueous phase to be more complete, but also reduces back-extraction fluctuations caused by insufficient CO2 or SO2 dissolution. The stable reaction environment improves the efficiency and quality of metal ion separation and recovery in the wet recycling of lithium batteries.

[0026] In a further preferred embodiment of this invention, a plurality of sieve plates 19 are fixedly installed inside the back-extraction tower 1. The sieve plates 19 are spaced apart along the vertical direction of the back-extraction tower 1, and sieve holes are evenly distributed on the sieve plates 19. After CO2 or SO2 gas is dispersed into small bubbles by the stirring device, the sieve plates 19 can prevent the small bubbles from aggregating or floating too quickly, forcing large bubbles to break again when passing through the sieve holes, thus maintaining smaller bubble size and a larger contact area.

[0027] In a further preferred embodiment of this invention, the stirring device includes a stirring shaft 12 and multiple layers of stirring blades 13. One end of the stirring shaft 12 passes through the top of the back-extraction tower 1 and is sealed and fixedly connected to the back-extraction tower 1. The other end of the stirring shaft 12 is connected to the multiple layers of stirring blades 13, which are spaced apart along the axial direction of the stirring shaft 12. A sieve plate 19 is provided above each layer of stirring blades 13. The rotation of the stirring blades 13 may cause the liquid to form a circulation or swirl in the tower, while the sieve plate 19 can play a certain rectification role. The liquid must pass through the sieve holes to enter the next layer, reducing the interference of lateral flow and making the shear force generated by stirring more concentrated on the phase interface breaking rather than ineffective overall rotation.

[0028] In a further preferred embodiment of this utility model, the cooling device includes a cooling water jacket 14, a cooling water inlet pipe 15, and a cooling water outlet pipe 16. The cooling water jacket 14 is fixedly sleeved on the outside of the back-extraction tower 1. The cooling water inlet pipe 15 is connected to and communicates with the bottom of the cooling water jacket 14, and the cooling water outlet pipe 16 is connected to and communicates with the top of the cooling water jacket 14. The cooling water inlet pipe 15 is connected to a cooling water supply device.

[0029] In a further preferred embodiment of this utility model, the back-extraction device for wet recovery of lithium batteries also includes a monitoring device connected to the back-extraction tower 1. The monitoring device includes a temperature sensor 17 and a pH detector 18. The temperature sensor 17 is used to monitor the temperature of the back-extraction tower 1, and the pH detector 18 is used to monitor the pH value of the solution in the back-extraction tower 1.

[0030] In a further preferred embodiment of this utility model, the inlet 2 is connected to the inlet pipe, which includes a mixing pipe 5, a water inlet pipe 6, and a loaded organic phase pipe 7. One end of the mixing pipe 5 is connected to and communicates with the back-extraction tower 1, and the other end is connected to and communicates with the water inlet pipe 6 and the loaded organic phase pipe 7 respectively. Both the water inlet pipe 6 and the loaded organic phase pipe 7 are fed by metering pumps (such as peristaltic pumps) according to the set flow rate. The liquids in the two pipes are mixed in the mixing pipe 5. A check valve 20 is provided in the middle of the mixing pipe 5 to prevent the backflow of dissolved CO2 or SO2.

[0031] In a further preferred embodiment of this utility model, the air inlet 3 is connected to a CO2 or SO2 inlet pipe 8, and a gas flow meter 10 is installed on the CO2 or SO2 inlet pipe 8. More preferably, the back-extraction tower 1 is provided with multiple air inlets 3, each air inlet 3 being connected to a CO2 or SO2 inlet pipe 8, and each CO2 or SO2 inlet pipe 8 being equipped with a gas flow meter 10.

[0032] In a further preferred embodiment of this utility model, the liquid outlet 4 is connected to the liquid outlet pipe 9, and a back pressure valve 11 is provided on the liquid outlet pipe 9.

[0033] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A back-extraction device for wet recovery of lithium batteries, characterized in that: The system includes a back-extraction tower, a stirring device, and a cooling device. The back-extraction tower has a liquid inlet and a gas inlet at the bottom and a liquid outlet at the top. The liquid inlet is used to introduce a mixture of water and a loaded organic phase. The gas inlet is used to introduce CO2 or SO2 gas. The liquid outlet is used to discharge the mixed liquid inside the back-extraction tower. The cooling device is fitted onto the outer wall of the back-extraction tower and is capable of cooling the back-extraction tower. The stirring device is located inside the back-extraction tower and passes through the top of the back-extraction tower, and is sealed to the back-extraction tower. The stirring device is capable of stirring the mixture inside the back-extraction tower.

2. The back-extraction apparatus for wet recovery of lithium batteries according to claim 1, characterized in that: A sieve plate is fixedly installed inside the stripping tower, and the sieve plate is evenly distributed with sieve holes.

3. The back-extraction apparatus for wet recovery of lithium batteries according to claim 2, characterized in that: The number of sieve plates is multiple, and the multiple sieve plates are distributed at intervals along the vertical direction of the back-extraction tower.

4. The back-extraction apparatus for wet recovery of lithium batteries according to claim 3, characterized in that: The stirring device includes a stirring shaft and multiple layers of stirring blades. One end of the stirring shaft passes through the top of the back-extraction tower and is sealed and fixedly connected to the back-extraction tower. The other end of the stirring shaft is connected to the multiple layers of stirring blades. The multiple layers of stirring blades are distributed at intervals along the axial direction of the stirring shaft. Each layer of stirring blades is provided with a sieve plate above it.

5. The back-extraction apparatus for wet recovery of lithium batteries according to claim 1, characterized in that: The cooling device includes a cooling water jacket, a cooling water inlet pipe, and a cooling water outlet pipe. The cooling water jacket is fixedly sleeved outside the stripping tower. The cooling water inlet pipe is connected to and communicates with the bottom of the cooling water jacket, and the cooling water outlet pipe is connected to and communicates with the top of the cooling water jacket.

6. The back-extraction apparatus for wet recovery of lithium batteries according to claim 1, characterized in that: It also includes a monitoring device connected to the back-extraction tower for monitoring the temperature of the back-extraction tower and the pH value of the solution inside the back-extraction tower.

7. The back-extraction apparatus for wet recovery of lithium batteries according to claim 6, characterized in that: The monitoring device includes a temperature sensor and a pH detector.

8. The back-extraction apparatus for wet recovery of lithium batteries according to claim 1, characterized in that: The liquid inlet is connected to the liquid inlet pipe, which includes a mixing pipe, a water inlet pipe, and a loaded organic phase pipe. One end of the mixing pipe is connected to and communicates with the back-extraction tower, and the other end is connected to and communicates with the water inlet pipe and the loaded organic phase pipe, respectively. A check valve is installed on the mixing pipe.

9. The back-extraction apparatus for wet recovery of lithium batteries according to claim 1, characterized in that: The air inlet is connected to a CO2 or SO2 air inlet pipe, and a gas flow meter is installed on the CO2 or SO2 air inlet pipe.

10. The back-extraction apparatus for wet recovery of lithium batteries according to claim 1, characterized in that: The liquid outlet is connected to the liquid outlet pipe, and a back pressure valve is installed on the liquid outlet pipe.

Images