Grinding device for lithium iron phosphate pulping

Abstract

The utility model discloses a grinding device for lithium iron phosphate pulping, and relates to the field of lithium iron phosphate grinding equipment, the grinding device comprises a nanometer sand mill, the nanometer sand mill comprises a motor, a base, a rack, a grinding cylinder and a feeding pump, the base is provided with the rack and the grinding cylinder, the grinding cylinder is filled with a nanometer grinding medium, and the feeding pump is connected with the motor. A motor is installed on the side wall of the machine frame, a main shaft is arranged in the grinding cylinder, a dispersing disc is arranged on the main shaft, the motor drives the dispersing disc to rotate through cooperation with the main shaft, a feeding port is formed in the grinding cylinder and connected with a feeding pipe, a connecting pipe is connected with a feeding pump, and the feeding pump is connected with the grinding cylinder. The dispersing disc rotates at a high speed, so that the movement of the grinding medium is more uniform and ordered, the lithium iron phosphate slurry can be finely and uniformly ground, and compared with a traditional coarse and fine grinding machine, the particle size difference caused by non-uniform grinding force is reduced, so that the particle size distribution of a final product is narrower, and the consistency is better.

Description

Technical Field

[0001] This utility model relates to the field of lithium iron phosphate grinding equipment, specifically a grinding device for lithium iron phosphate slurry preparation. Background Technology

[0002] Lithium iron phosphate (LFP) is commonly used as the cathode material in lithium-ion power batteries. LFP cathode materials have advantages such as high safety performance, long cycle life, good high-temperature performance, and low raw material cost, making them very promising for applications. When preparing and grinding LFP slurry, a combination of coarse and fine grinding mills is typically used. The coarse mill first initially crushes the LFP raw material to reduce its particle size, and then the fine mill further grinds it to achieve the required particle size. The coarse and fine grinding mills generally use a motor to drive the grinding media within the grinding chamber, impacting and grinding the material. During the grinding process, the material enters the grinding chamber through the feed inlet, is gradually pulverized and refined under the action of the grinding media, and is finally discharged from the outlet.

[0003] During the grinding process in coarse and fine grinding mills, the differences in the size, shape, and trajectory of the grinding media make it difficult to ensure that the material receives uniform grinding force throughout the entire grinding process. This results in a wide particle size distribution in the final product, with some particles being too large or too small, affecting the consistency and performance stability of lithium iron phosphate products. The entire grinding process is also quite cumbersome, and the movement of the grinding media within the grinding chamber involves some ineffective motion, leading to low energy utilization and thus low grinding efficiency. Furthermore, due to the high hardness of lithium iron phosphate itself, the inner wall of the grinding chamber and the grinding media in the coarse and fine grinding mills suffer severe wear during prolonged grinding. This not only increases equipment maintenance costs, but frequent replacement of worn parts also disrupts production continuity. Utility Model Content

[0004] The purpose of this invention is to provide a grinding device for lithium iron phosphate slurry preparation, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A grinding device for lithium iron phosphate slurry includes a nano-sand mill, which comprises a motor, a base, a frame, a grinding cylinder, and a feed pump. The frame and grinding cylinder are mounted on the base. The grinding cylinder is filled with nano-sized grinding media. The motor is mounted on the side wall of the frame. A main shaft is located inside the grinding cylinder, and a dispersing disc is mounted on the main shaft. The motor drives the dispersing disc to rotate through its cooperation with the main shaft. The grinding cylinder has a feed inlet connected to a feed pipe, which is connected to the feed pump. The grinding cylinder has a discharge outlet on its side wall, and a discharge screen is located inside the discharge outlet.

[0007] Based on the above technical solutions, this utility model also provides the following optional technical solutions:

[0008] In one alternative: the feed pipe is equipped with an automatic slurry iron remover and a plate heat exchanger, the feed pump is a pneumatic diaphragm pump, the discharge end of the feed pump is connected to the automatic slurry iron remover, and a plate heat exchanger is installed between the automatic slurry iron remover and the nano-sand mill.

[0009] In one alternative: the feed pump has a connecting pipe at its feed end, and one end of the connecting pipe is connected to a dispersion tank.

[0010] In one alternative: the nano-sand mill is further provided with a cooling system, which includes an inlet for introducing chilled water and an outlet for discharging chilled water.

[0011] In one alternative: the discharge port is connected to a discharge pipe, and a sampling valve is installed on the discharge pipe.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. The grinding device for lithium iron phosphate slurry uses nano-level grinding media. The high-speed rotation of the dispersing disc makes the movement of the grinding media more uniform and orderly, which can grind the lithium iron phosphate slurry more finely and evenly. Compared with traditional coarse and fine grinding mills, it greatly reduces the particle size difference caused by uneven grinding force, resulting in a narrower particle size distribution and better consistency of the final product.

[0014] 2. The small size and high specific surface area of ​​nano-abrasive media increase the contact area with materials, improve grinding efficiency, enable grinding devices to grind materials efficiently in a short time, reduce ineffective movement of grinding media, make fuller use of energy, significantly improve production efficiency, and reduce production costs.

[0015] 3. The nano-grinding mill adopts a special material and structural design. The inner wall of its grinding cylinder and the surface of the dispersion disc are usually made of high-hardness, wear-resistant materials. The nano-grinding media have high hardness and low wear. During the grinding process, the wear on the equipment is far less than that of traditional coarse and fine grinding mills, which reduces the number of equipment maintenance and the frequency of parts replacement, and also extends the service life of the equipment and reduces the maintenance cost. Attached Figure Description

[0016] Figure 1 A schematic diagram of the grinding device for preparing lithium iron phosphate slurry.

[0017] Figure 2 A schematic diagram of the automatic slurry iron remover in a grinding device for lithium iron phosphate slurry preparation.

[0018] Figure 3 A schematic diagram of the production process for preparing lithium iron phosphate slurry.

[0019] Figure label annotations: 1-Nano sand mill, 2-Base, 3-Frame, 4-Motor, 5-Feed pipe, 6-Feed inlet, 7-Discharge outlet, 8-Grinding cylinder, 9-Air inlet, 10-Water outlet, 11-Discharge pipe, 12-Sampling valve, 13-Water inlet, 14-Plate heat exchanger, 15-Automatic slurry iron remover, 16-Feed pump, 17-Dispersion tank, 18-Connecting pipe. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. In the drawings and description, similar or identical parts are referred to by the same reference numerals, and in practical applications, the shape, thickness, or height of each component may be enlarged or reduced. The embodiments listed in this utility model are merely illustrative and not intended to limit the scope of this utility model. Any obvious modifications or changes made to this utility model do not depart from its spirit and scope.

[0021] In one embodiment, such as Figure 1-3 As shown, a grinding device for lithium iron phosphate slurry includes a nano-sand mill 1, which consists of a motor 4, a base 3, a frame 2, a grinding cylinder 8, and a feed pump 16. The frame 2 and the grinding cylinder 8 are mounted on the base 3. The grinding cylinder 8 is filled with nano-sized grinding media. The motor 4 is mounted on the side wall of the frame 2. A main shaft is installed inside the grinding cylinder 8, and a dispersing disc is mounted on the main shaft. The motor 4 drives the dispersing disc to rotate through its cooperation with the main shaft. A feed inlet 6 is provided on the grinding cylinder 8, and a feed pipe 5 is connected to the feed pump 16. A discharge outlet 7 is provided on the side wall of the grinding cylinder 8, and a discharge screen is provided inside the discharge outlet 7.

[0022] The grinding device for lithium iron phosphate slurry uses a nano-sand mill 1 instead of a traditional coarse and fine mill. The grinding cylinder 8 is filled with nano-sized grinding media (such as nano-zirconia beads). The dispersing disc is installed on the main shaft inside the grinding cylinder 8 and is driven to rotate at high speed by a motor 4. The feed pump 16 is used to deliver the lithium iron phosphate slurry to the grinding cylinder 8 at a certain pressure and flow rate. The high-speed rotation of the dispersing disc makes the movement of the grinding media more uniform and orderly, which can grind the lithium iron phosphate slurry more finely and uniformly. The discharge screen is installed at the discharge port 7 to intercept the grinding media and only allow the slurry that meets the particle size requirements to pass through, so that the particle size distribution of the final product is narrower and the consistency is better. As an embodiment, the left, right, up, and down positions of the various components shown in the attached figure are only one arrangement method. The specific positions are set according to specific needs.

[0023] In one embodiment, such as Figure 2 As shown, the feed pipe 5 is equipped with an automatic slurry iron remover 15 and a plate heat exchanger 14. The feed pump 16 is a pneumatic diaphragm pump. The discharge end of the feed pump 16 is connected to the automatic slurry iron remover 15. The plate heat exchanger 14 is installed between the automatic slurry iron remover 15 and the nano-sand mill 1.

[0024] In one embodiment, such as Figure 3 As shown, the feed pump 16 is provided with a connecting pipe 18 at its feed end, and one end of the connecting pipe 18 is connected to a dispersion tank 17.

[0025] In one embodiment, such as Figure 1 As shown, the nano-sand mill 1 is provided with an air inlet 9 for introducing compressed air, and the nano-sand mill 1 is connected to a water inlet 13 and a water outlet 10 for chilled water circulation.

[0026] In one embodiment, such as Figure 1 As shown, the discharge port 7 is connected to the discharge pipe 11, and a sampling valve 12 is installed on the discharge pipe 11.

[0027] The above embodiments of this utility model provide a grinding device for lithium iron phosphate slurry preparation. Lithium iron phosphate raw materials are mixed evenly with appropriate amounts of solvents and additives to form a slurry to be ground. The slurry is then transported to the grinding cylinder 8 of the nano-sand mill 1 via a feed pump 16. During the feeding process, the flow rate and pressure of the feed pump 16 can be adjusted according to the properties of the slurry and the desired grinding effect. The motor 4 is started, driving a dispersing disc on the main shaft to rotate at high speed. The high-speed rotation of the dispersing disc causes the nano-grinding media inside the grinding cylinder 8 to generate strong motion, subjecting the slurry entering the grinding cylinder 8 to high-speed impact, shearing, and grinding. During the grinding process, parameters such as the temperature and pressure of the slurry are continuously monitored. The grinding cylinder 8 can be cooled by a cooling system to prevent excessive heat generated during the grinding process from affecting the slurry quality. The ground slurry is filtered through a discharge screen, trapping the grinding media inside the grinding cylinder 8. Lithium iron phosphate slurry meeting the particle size requirements is discharged from the discharge port 7, completing the slurry preparation and grinding process.

[0028] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A grinding apparatus for lithium iron phosphate slurry preparation, comprising a nano-sand mill, characterized in that, The nano-grinding mill includes a motor, a base, a frame, a grinding cylinder, and a feed pump. The frame and grinding cylinder are mounted on the base. The grinding cylinder is filled with nano-sized grinding media. The motor is mounted on the side wall of the frame. A main shaft is located inside the grinding cylinder. A dispersing disc is mounted on the main shaft. The motor drives the dispersing disc to rotate through its cooperation with the main shaft. The grinding cylinder has a feed inlet connected to a feed pipe, which is connected to the feed pump. The grinding cylinder has a discharge outlet on its side wall, and a discharge screen is located inside the discharge outlet.

2. The grinding apparatus for lithium iron phosphate slurry preparation according to claim 1, characterized in that, An automatic slurry iron remover and a plate heat exchanger are installed on the feed pipe. The feed pump is a pneumatic diaphragm pump. The discharge end of the feed pump is connected to the automatic slurry iron remover. A plate heat exchanger is installed between the automatic slurry iron remover and the nano-sand mill.

3. The grinding apparatus for lithium iron phosphate slurry preparation according to claim 2, characterized in that, The feed pump is equipped with a connecting pipe at its feed end, and one end of the connecting pipe is connected to a dispersion tank.

4. The grinding apparatus for lithium iron phosphate slurry preparation according to claim 1, characterized in that, The nano-sand mill is also equipped with a cooling system, which includes an inlet for introducing chilled water and an outlet for discharging chilled water.

5. The grinding apparatus for lithium iron phosphate slurry preparation according to claim 1, characterized in that, The discharge port is connected to a discharge pipe, and a sampling valve is installed on the discharge pipe.

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