A raw material mixing device for continuous lithium sinking operation

Abstract

The utility model relates to lithium ion battery positive pole material precursor synthesis equipment technical field, and disclose a kind of raw material mixing device of continuous lithium precipitation operation, including mixing bucket, the inside fixed of mixing bucket is equipped with the spiral flow guide plate that solution is guided, the top of mixing bucket is fixedly equipped with support, lithium salt solution metering pump is fixedly installed in the side of the top of support, metal solution metering pump is fixedly installed in the other side of the top of support, the middle part of the top of mixing bucket is equipped with premixing component to solution is premixed;By setting lithium salt solution metering pump and metal solution metering pump, two raw material solutions can be accurately and continuously pumped into premixing component, then enter mixing bucket and mix, finally continuously discharge through the ultrasonic discharge component of bottom, realize the continuous of entire lithium precipitation raw material mixing process, significantly improve production efficiency, break the traditional single pipeline feeding mode.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium-ion battery cathode material precursor synthesis equipment, specifically a raw material mixing device for continuous lithium deposition operation. Background Technology

[0002] In the preparation of cathode materials for lithium-ion batteries (such as lithium iron phosphate, ternary materials, etc.), it is often necessary to prepare key precursors through a "lithium precipitation" reaction. This process usually involves mixing lithium salt solutions (such as LiOH) with metal salt solutions (such as FeSO4, NiSO4, etc.) and generating insoluble lithium salt precipitates through a chemical reaction.

[0003] Currently, batch mixing reactors are commonly used in industrial production. These reactors are characterized by low production efficiency. After each batch of mixing reaction is completed, the reactor needs to be cleaned and the feed needs to be added, which makes it impossible to achieve continuous production, restricts production capacity, and results in poor product consistency. The process conditions between batches are difficult to completely replicate, leading to differences in particle morphology and particle size distribution between different batches of products. This affects the electrochemical performance of the final cathode material. In the large volume inside the reactor, the two solutions are mixed by mechanical stirring, which can easily create mixing dead zones, resulting in excessively high local concentrations and the phenomenon of "local supersaturation". This leads to the formation of a large number of crystal nuclei, causing uneven particle size and even agglomeration.

[0004] Therefore, developing a lithium-ion raw material mixing device that can achieve rapid and uniform mixing and is suitable for continuous production is of great significance for improving the product quality and production efficiency of lithium battery materials. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a raw material mixing device for continuous lithium deposition operations, which has the advantages of achieving rapid and uniform mixing with good continuity, thus solving the problems mentioned in the background technology.

[0006] This utility model provides the following technical solution: a raw material mixing device for continuous lithium precipitation operation, including a mixing tank, a spiral guide plate for guiding the solution is fixedly installed inside the mixing tank, a support is fixedly installed at the top of the mixing tank, a lithium salt solution metering pump is fixedly installed on one side of the top of the support, a metal solution metering pump is fixedly installed on the other side of the top of the support, a premixing component for premixing the solution is provided in the middle of the top of the mixing tank, and a spherical bottom is fixedly installed at the bottom of the mixing tank, with an ultrasonic discharge component at the bottom end of the spherical bottom.

[0007] As a preferred technical solution of this utility model, the premixing component includes a manifold one and a manifold two. The input end of the manifold one is fixedly connected to two branch pipes one, and the output end of the manifold one is fixedly connected to two branch pipes two. The input end of the manifold two is fixedly connected to the output end of the branch pipes two. The output end of the manifold two is fixedly connected to a connecting pipe through a flange. A feed inlet is opened in the middle of the top of the mixing tank, and the output end of the connecting pipe is fixedly connected to the feed inlet.

[0008] As a preferred embodiment of this utility model, both the output end of the lithium salt solution metering pump and the output end of the metal solution metering pump are fixedly provided with a conduit, and the output end of the conduit is fixedly connected to the input end of the shunt pipe through a flange.

[0009] As a preferred technical solution of this utility model, the top of the bracket is provided with a groove for inserting and connecting with the first diversion pipe, and the input end of the lithium salt solution metering pump and the input end of the metal solution metering pump are both fixedly provided with the second conduit.

[0010] As a preferred embodiment of this utility model, the ultrasonic discharge assembly includes a discharge barrel, a plurality of ultrasonic transducers are fixedly installed on the surface of the discharge barrel, and a flow control valve is fixedly installed at the bottom of the discharge barrel.

[0011] As a preferred technical solution of this utility model, the top of the discharge barrel is fixedly provided with an installation ring, the middle of the bottom of the spherical bottom is fixedly provided with a positioning seat, the bottom of the positioning seat is fixedly connected to the top of the installation ring by bolts, and a rubber gasket is provided between the installation ring and the positioning seat.

[0012] As a preferred embodiment of this utility model, the mixing tank is provided with an inner tube, and curved ends are fixedly provided at the top and bottom of the inner tube. The spiral guide plate is located between the inner tube and the mixing tank.

[0013] As a preferred embodiment of this utility model, a support ring is fixedly provided at the bottom of the mixing tank, a reinforcing rib is welded to the top of the support ring for further tightening, a column is fixedly provided at the bottom of the support ring, and a base plate is fixedly provided at the bottom of the column.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The raw material mixing device for this continuous lithium precipitation operation, by setting up a lithium salt solution metering pump and a metal solution metering pump, can accurately and continuously pump the two raw material solutions into the premixing component, then into the mixing tank for mixing, and finally continuously discharge them through the ultrasonic discharge component at the bottom. This realizes the continuity of the entire lithium precipitation raw material mixing process, significantly improving production efficiency. The premixing component allows the two solutions to undergo preliminary cross-mixing and counter-mixing before entering the main cavity of the mixing tank, breaking the traditional single-pipe feeding mode. Inside, the solution forms a stable vortex under the constraint of the spiral guide plate in the mixing tank, extending the mixing path, avoiding short-circuit flow and mixing dead zones, ensuring that the solution is fully and uniformly mixed in the tank, effectively preventing local oversaturation, and facilitating the formation of precipitated particles with uniform particle size.

[0016] 2. The raw material mixing device for this continuous lithium deposition operation has a spherical bottom design at the bottom of the mixing tank, which is conducive to the collection and guidance of materials. Combined with the ultrasonic discharge component, the high-frequency vibration of the ultrasonic transducer can effectively break up any possible small crystal nuclei agglomerates, prevent blockage near the discharge port, and ensure the stability and reliability of continuous discharge. Attached Figure Description

[0017] Figure 1 This is one of the structural schematic diagrams of this utility model;

[0018] Figure 2 This is the second structural schematic diagram of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the premixed component of this utility model;

[0020] Figure 4 This is a schematic diagram of the internal structure of the mixing tank of this utility model;

[0021] Figure 5 This is a schematic diagram of the ultrasonic discharge assembly of this utility model.

[0022] In the diagram: 1. Mixing tank; 2. Inner tube; 3. Spiral guide plate; 4. Curved end; 5. Feed inlet; 6. Support; 7. Lithium salt solution metering pump; 8. Metal solution metering pump; 9. Premixing assembly; 901. Manifold 1; 902. Diverter 1; 903. Diverter 2; 904. Manifold 2; 905. Connecting pipe; 10. Conduit 1; 11. Conduit 2; 12. Support ring; 13. Reinforcing rib; 14. Spherical bottom; 15. Positioning seat; 16. Ultrasonic discharge assembly; 1601. Discharge tank; 1602. Ultrasonic transducer; 1603. Flow control valve; 1604. Mounting ring; 1605. Rubber gasket; 17. Base plate; 18. Column. Detailed Implementation

[0023] 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.

[0024] Please see Figures 1-5 The raw material mixing device for continuous lithium precipitation operation includes a mixing tank 1. The interior of the mixing tank 1 is fixedly equipped with a spiral guide plate 3 for guiding the flow of the solution. When the solution flows through, the spiral guide plate 3 guides the solution to form a downward rotating flow field, which greatly enhances the mixing effect and residence time.

[0025] A lithium salt solution metering pump 7 and a metal solution metering pump 8 are fixedly installed at the top of the mixing tank 1 via a bracket 6. These two metering pumps are connected to their respective raw material storage tanks via conduit 2 11 for precise and continuous delivery of raw material solutions. The output ends of the lithium salt solution metering pump 7 and the metal solution metering pump 8 are connected to the premixing component 9 via conduit 10. The premixing component 9 is located in the middle of the top of the mixing tank 1 for premixing the solution. The premixing component 9 is one of the key components for achieving preliminary uniform mixing in this invention, realizing preliminary homogenization and laying a good foundation for subsequent deep mixing in the mixing tank 1. A spherical bottom 14 is fixedly installed at the bottom of the mixing tank 1, which is conducive to the slurry after reaction converging towards the center. An ultrasonic discharge component 16 is provided at the bottom end of the spherical bottom 14, which can effectively disperse the small agglomerates near the discharge port, prevent blockage, and ensure continuous and stable discharge of slurry.

[0026] In this embodiment, preferably, the premixing component 9 includes a first manifold 901 and a second manifold 904. The input end of the first manifold 901 is fixedly connected to two first branch pipes 902, which are used to receive solutions from two metering pumps respectively. The output end of the first manifold 901 is fixedly connected to two second branch pipes 903. The outlets of these two second branch pipes 903 then converge into a second manifold 904. The input end of the second manifold 904 is fixedly connected to the output end of the second branch pipes 903. The output end of the second manifold 904 is fixedly connected to a connecting pipe 905 via a flange. A feed inlet 5 is provided at the center of the top of the mixing tank 1. The output end of the connector 905 is fixedly connected to the inlet 5. The output ends of the lithium salt solution metering pump 7 and the metal solution metering pump 8 are both fixedly equipped with conduit 10. The output end of conduit 10 is fixedly connected to the input end of the diverter pipe 902 through a flange. The top of the bracket 6 is provided with a pipe groove that is inserted and connected to the diverter pipe 902. The input ends of the lithium salt solution metering pump 7 and the metal solution metering pump 8 are both fixedly equipped with conduit 2 11. This "diversion-convergence-re-diversion-re-convergence" pipeline design allows the lithium salt solution and the metal solution to undergo multiple cross-flows, flushing and mixing before entering the mixing tank 1.

[0027] In this embodiment, preferably, the ultrasonic discharge assembly 16 includes a discharge barrel 1601, a plurality of ultrasonic transducers 1602 are fixedly installed on the surface of the discharge barrel 1601, a flow control valve 1603 is fixedly installed at the bottom end of the discharge barrel 1601, an installation ring 1604 is fixedly installed at the top end of the discharge barrel 1601, a positioning seat 15 is fixedly installed at the middle of the bottom end of the spherical bottom 14, the bottom end of the positioning seat 15 is fixedly connected to the top end of the installation ring 1604 by bolts, and a rubber gasket 1605 is provided between the installation ring 1604 and the positioning seat 15. The high-frequency vibration generated by the ultrasonic transducers 1602 when working can effectively disperse the small agglomerates near the discharge port, prevent blockage, and ensure continuous and stable discharge of slurry. The flow control valve 1603 is used to precisely control the discharge flow rate to keep it in dynamic balance with the feed rate. The rubber gasket 1605 provided between the installation ring 1604 and the positioning seat 15 plays a role in sealing and shock absorption.

[0028] In this embodiment, preferably, the mixing tank 1 is provided with an inner tube 2, and curved end caps 4 are fixedly provided at both the top and bottom of the inner tube 2. The spiral guide plate 3 is located between the inner tube 2 and the mixing tank 1. A support ring 12 is fixedly provided at the bottom of the mixing tank 1. A reinforcing rib plate 13 is welded to the top of the support ring 12 for further reinforcement. A column 18 is fixedly provided at the bottom of the support ring 12. A base plate 17 is fixedly provided at the bottom of the column 18, thus forming a stable support structure.

[0029] When using, ensure that the mixing tank 1, premixing component 9, lithium salt solution metering pump 7, metal solution metering pump 8, ultrasonic discharge component 16 and other components are securely installed without looseness or damage. Connect the lithium salt solution storage tank to the input end of the lithium salt solution metering pump 7 through conduit 2 11, and connect the metal solution storage tank to the input end of the metal solution metering pump 8 through conduit 2 11. Ensure that the electrical equipment such as the metering pump and ultrasonic transducer 1602 are powered normally.

[0030] Start the lithium salt solution metering pump 7 and the metal solution metering pump 8, and adjust the pumping rate to the flow rate value required by the process. The two solutions enter the premixing component 9 through the conduit 10. In the premixing component 9, the solution crosses and counter-flows multiple times through the diverter 902, the manifold 901, the diverter 903, and the manifold 904 to achieve preliminary mixing. The mixed solution enters the mixing tank 1 from the feed inlet 5 through the connecting pipe 905.

[0031] The solution forms a swirling flow along the spiral guide plate 3 in the mixing tank 1, which extends the mixing path and avoids short-circuit flow and mixing dead zones. The inner tube 2 and curved end 4 further optimize the flow field to ensure that the solution is fully and uniformly mixed, while preventing the solution from flowing into the inner tube 2. The mixed slurry is collected at the spherical bottom 14 and enters the ultrasonic discharge component 16.

[0032] The ultrasonic transducer 1602 is turned on, and the high-frequency vibration breaks up the tiny crystal agglomerates, preventing blockage and improving the mixing effect. The discharge flow rate is adjusted by the flow control valve 1603 to maintain a dynamic balance with the feed rate, which enables the continuous lithium deposition operation.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A raw material mixing device for continuous lithium deposition operation, comprising a mixing tank (1), characterized in that: The mixing tank (1) is fixedly provided with a spiral guide plate (3) for guiding the solution. The top of the mixing tank (1) is fixedly provided with a bracket (6). A lithium salt solution metering pump (7) is fixedly installed on one side of the top of the bracket (6). A metal solution metering pump (8) is fixedly installed on the other side of the top of the bracket (6). A premixing component (9) for premixing the solution is provided in the middle of the top of the mixing tank (1). A spherical bottom (14) is fixedly provided at the bottom of the mixing tank (1). An ultrasonic discharge component (16) is provided at the bottom end of the spherical bottom (14).

2. The raw material mixing device for continuous lithium deposition operation according to claim 1, characterized in that: The premixing component (9) includes a manifold 1 (901) and a manifold 2 (904). The input end of the manifold 1 (901) is fixedly connected to two branch pipes 1 (902), and the output end of the manifold 1 (901) is fixedly connected to two branch pipes 2 (903). The input end of the manifold 2 (904) is fixedly connected to the output end of the branch pipes 2 (903). The output end of the manifold 2 (904) is fixedly connected to a connecting pipe (905) via a flange. The mixing tank (1) has a feed inlet (5) at the middle of its top, and the output end of the connecting pipe (905) is fixedly connected to the feed inlet (5).

3. The raw material mixing device for continuous lithium deposition operation according to claim 2, characterized in that: Both the output end of the lithium salt solution metering pump (7) and the output end of the metal solution metering pump (8) are fixedly provided with a conduit (10), and the output end of the conduit (10) is fixedly connected to the input end of the shunt pipe (902) through a flange.

4. The raw material mixing device for continuous lithium deposition operation according to claim 2, characterized in that: The top of the bracket (6) is provided with a tube groove that is inserted and connected to the first shunt pipe (902). The input end of the lithium salt solution metering pump (7) and the input end of the metal solution metering pump (8) are both fixedly provided with the second conduit (11).

5. The raw material mixing device for continuous lithium deposition operation according to claim 1, characterized in that: The ultrasonic discharge assembly (16) includes a discharge barrel (1601), a plurality of ultrasonic transducers (1602) are fixedly installed on the surface of the discharge barrel (1601), and a flow control valve (1603) is fixedly installed at the bottom of the discharge barrel (1601).

6. The raw material mixing device for continuous lithium deposition operation according to claim 5, characterized in that: The top of the discharge hopper (1601) is fixedly provided with an installation ring (1604), and the middle of the bottom of the spherical bottom (14) is fixedly provided with a positioning seat (15). The bottom of the positioning seat (15) is fixedly connected to the top of the installation ring (1604) by bolts. A rubber gasket (1605) is provided between the installation ring (1604) and the positioning seat (15).

7. The raw material mixing device for continuous lithium deposition operation according to claim 1, characterized in that: The mixing tank (1) is provided with an inner tube (2), and the top and bottom ends of the inner tube (2) are fixed with curved end caps (4). The spiral guide plate (3) is located between the inner tube (2) and the mixing tank (1).

8. The raw material mixing device for continuous lithium deposition operation according to claim 1, characterized in that: The bottom of the mixing tank (1) is fixedly provided with a support ring (12), and the top of the support ring (12) is welded with a reinforcing rib plate (13) for further tightening. The bottom end of the support ring (12) is fixedly provided with a column (18), and the bottom end of the column (18) is fixedly provided with a base plate (17).

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