Multi-component grinding and mixing device

Abstract

The utility model discloses a multi-component grinding and mixing device which comprises a mixing tank and further comprises at least two drying chambers which are arranged at the top of the mixing tank and are not communicated with each other, a discharging valve is arranged at the bottom of each drying chamber, and a feeding mechanism is arranged at the top of each drying chamber. The feeding mechanism comprises an atomizer, a feeding port and an air inlet, wherein the feeding port and the air inlet are formed in the two sides of the atomizer respectively. According to the utility model, a plurality of feeding mechanisms and drying chambers which are not communicated with one another are arranged above the mixing tank, and different materials are respectively and independently atomized and dried, so that chemical reactions such as hydrolysis among components are effectively avoided, and the quality of lithium iron phosphate products is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium iron phosphate cathode materials, and in particular to a multi-component grinding and mixing device. Background Technology

[0002] In the preparation of lithium iron phosphate cathode materials, the problem of material separation has always been a key factor restricting the improvement of production efficiency and product quality.

[0003] The traditional process for producing lithium iron phosphate involves mixing iron phosphate, lithium carbonate, and glucose in pure water to form a slurry, which is then ground together in a sand mill. The final product is obtained after spray drying, calcination, and pulverization. While this process is relatively simple, it presents numerous challenges related to material separation.

[0004] First, the physicochemical properties of the three raw materials—ferric phosphate, lithium carbonate, and glucose—differ significantly. Lithium carbonate has low hardness and is slightly soluble in water, while ferric phosphate has high hardness and is insoluble in water. During mixing and grinding, it is difficult to ensure that both achieve the ideal particle size. Lithium carbonate is prone to over-grinding, while ferric phosphate may be under-grinded. This not only affects the performance of subsequent products but also increases the difficulty of material separation. Because materials of different particle sizes exhibit different physical behaviors in subsequent drying and calcination processes, the already complex material system becomes even more difficult to separate and control.

[0005] Secondly, after dispersion in pure water, lithium carbonate and iron phosphate undergo a double hydrolysis, producing trace amounts of ferric hydroxide. This ferric hydroxide poses a risk of generating free magnetic substances during subsequent processing, which must be strictly controlled in lithium iron phosphate production. This reaction not only alters the chemical composition of the materials but also complicates the interactions between them, further interfering with the separation process. Moreover, due to the presence of the double hydrolysis products, these impurities may bind tightly to other materials during drying, making them difficult to remove using conventional separation methods.

[0006] Furthermore, glucose requires a relatively low drying temperature. If it is mixed with the other two raw materials for drying, it is not only prone to oxidative decomposition due to excessively high temperatures, affecting product quality, but also results in a high overall solids content in the slurry, increasing drying difficulty and energy consumption. Simultaneously, the high solids content of the slurry can easily cause nozzle clogging during spray drying, affecting production continuity. From a material separation perspective, mixing materials with different drying characteristics makes separating the dried materials more challenging, making it difficult to obtain pure components.

[0007] Furthermore, existing production equipment and processes lack effective separation mechanisms when dealing with multi-component materials. During the grinding and spray drying process, it is impossible to precisely process and separate different materials, making it difficult to guarantee the purity and uniformity of each component in the product, thus limiting the application of lithium iron phosphate products in high-end fields.

[0008] In summary, how to solve the material separation problem in the preparation process of lithium iron phosphate and achieve efficient separation, precise control and full utilization of each component material has become a key technical problem that urgently needs to be solved in the field of lithium iron phosphate cathode material preparation. Utility Model Content

[0009] The purpose of this invention is to provide a multi-component grinding and mixing device. By setting multiple non-connected drying chambers and feeding mechanisms above the mixing tank, different materials are atomized and dried separately, effectively avoiding chemical reactions such as hydrolysis between components, and greatly improving the quality of lithium iron phosphate products.

[0010] To achieve the above objectives, this utility model provides the following technical solution:

[0011] This utility model discloses a multi-component grinding and mixing device, including a mixing tank and at least two non-communicating drying chambers located on the top of the mixing tank. The drying chambers are provided with a discharge valve at the bottom and a feeding mechanism at the top. The feeding mechanism includes an atomizer, a feed inlet and an air inlet located on both sides of the atomizer.

[0012] A further solution: The air inlet is connected to a spiral duct.

[0013] A further solution: The air inlet end of the spiral duct is equipped with a heater and a fan.

[0014] A further proposed solution: all air inlets are arranged outwards from the center of the mixing tank.

[0015] A further solution: The air inlet of the fan is connected to a filter.

[0016] A further solution: The feed inlet is connected to a feed pump.

[0017] A further embodiment: The mixing tank is provided with a rotating shaft, and the rotating shaft is circumferentially arranged with stirring paddles; the rotating shaft is connected and fixed to the mixing tank by a bushing.

[0018] A further embodiment: a power unit is connected to the mixing tank; the power unit includes a motor, a drive shaft connected to the motor, and a first drive gear located at the end of the drive shaft; a second drive gear is provided at the top of the rotating shaft, and the first drive gear and the second drive gear mesh with each other.

[0019] A further solution: The mixing tank is provided with a discharge port at the bottom.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] This invention adds multiple drying chambers above the mixing tank. Different materials are individually atomized using atomization and hot air before falling into individual drying chambers for further drying. This effectively avoids chemical reactions such as hydrolysis between components, fundamentally eliminating the formation of ferric hydroxide due to double hydrolysis. It also reduces the risk of generating free magnetic substances during subsequent processing, significantly improving the quality of lithium iron phosphate products and meeting the stringent purity and stability requirements of the high-end market. The separate feeding mechanism can specifically adjust the temperature and airflow of the hot air according to the material characteristics. This ensures that each material is dried at a suitable temperature, avoiding problems such as oxidation and decomposition of glucose due to excessive temperature. Furthermore, reasonable temperature regulation reduces the overall energy consumption of the system, achieving the dual goals of energy saving and high-quality production. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the spiral duct distribution of this utility model;

[0024] Figure 3 This is a schematic diagram of the feeding mechanism in this utility model;

[0025] In the diagram: 1-mixing tank, 2-drying chamber, 3-feeding mechanism, 31-feed inlet, 32-air inlet, 33-atomizer, 4-spiral duct, 5-heater, 6-fan, 7-filter, 8-feeding pump, 9-rotating shaft, 10-stirring paddle, 11-liner, 12-power unit, 121-motor, 122-drive shaft, 123-first drive gear, 13-second drive gear, 14-discharge port. Detailed Implementation

[0026] 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.

[0027] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Please see Figure 1-3 In this embodiment, a multi-component grinding and mixing device includes a mixing tank 1 and three non-communicating drying chambers 2 located on top of the mixing tank 1. These three drying chambers 2 are respectively used to hold glucose, lithium phosphate, and iron phosphate. Each drying chamber 2 has a discharge valve at its bottom and a feeding mechanism 3 at its top. The feeding mechanism 3 includes a feed inlet 31, an air inlet 32, and an atomizer 33. The feed inlet 31 and air inlet 32 ​​are respectively located on both sides of the atomizer 33. Hot air enters the material tank of the atomizer 33 through the air inlet 32. Simultaneously, liquid material enters the material tank through the feed inlet 31, is processed by the atomizer 33 into tiny droplets, and comes into full contact with the hot air before falling into the drying chambers. The drying chambers 2 are pre-set with suitable drying conditions, and the discharge valve opens and closes periodically, allowing the dried material to fall into the mixing tank 1. Hot air atomization improves drying efficiency and avoids material agglomeration during subsequent mixing, preventing uneven mixing. By adjusting the temperature and air volume of the hot air according to the characteristics of the materials, it is possible to ensure that each material can be dried at a suitable temperature, avoiding problems such as oxidation and decomposition of glucose due to excessive temperature. At the same time, reasonable temperature regulation reduces the overall energy consumption of the system, achieving the dual goals of energy saving and high-quality production.

[0029] Furthermore, the air inlet 32 ​​is connected to a spiral duct 4. When hot air enters the spiral duct 4, it is guided to move in a spiral motion into the drying chamber 2, which can more comprehensively cover the atomized droplets sprayed from the atomizer 33, making the material dry more evenly and avoiding local over-drying or under-drying.

[0030] Furthermore, the air inlet end of the spiral duct 4 is equipped with a heater 5 and a fan 6. The heater 5 and the fan 6 provide suitable drying hot air to the system. The heater 5 controls the hot air temperature, and the fan 6 controls the air intake volume of the hot air, providing hot air at a suitable temperature for different drying chambers to meet the drying requirements of different materials.

[0031] Furthermore, all air inlets 32 are arranged outward from the center of the mixing tank 1 to avoid the hot air from different drying chambers 2 from affecting each other and making the temperature field and airflow field in the drying chamber 2 unstable.

[0032] Furthermore, a filter 7 is connected to the air inlet of the fan 6. During system operation, the fan 6 draws in outside air, which often contains particulate matter such as dust and impurities. The filter 7 removes these impurities, ensuring the purity of the hot air entering the drying chamber 2 and preventing contamination of materials by foreign objects.

[0033] Furthermore, a feed pump 8 is connected to the feed inlet 31.

[0034] Furthermore, the mixing tank 1 is equipped with a rotating shaft 9, and stirring paddles 10 are arranged circumferentially on the rotating shaft 9; the rotating shaft 9 is connected and fixed to the mixing tank 1 through a bushing 11. The rotating shaft 9 is installed at the center of the bushing 11, and a bearing is provided at the connection between the bushing 11 and the rotating shaft 9, which ensures the smooth rotation of the rotating shaft 9.

[0035] Furthermore, a power unit 12 is connected to the mixing tank 1; the power unit 12 includes a motor 121, a drive shaft 122 connected to the motor 121, and a first drive gear 123 located at the end of the drive shaft 122; a second drive gear 13 is located at the top of the rotating shaft 9, and the first drive gear 123 and the second drive gear 13 mesh with each other. Both the first drive gear 123 and the second drive gear 13 are helical bevel gears. The motor 121 drives the rotating shaft 122 to rotate.

[0036] Furthermore, the mixing tank 1 is provided with a discharge port 14 at the bottom. After the material is fully stirred and mixed, it is discharged from the discharge port 14 and enters the next process.

[0037] In operation, the material is pumped in by the feed pump 8 and enters the material tank of the atomizer 33 through the feed inlet 31. At the same time, hot air with pre-adjusted temperature and volume is blown in through the air inlet 32. The atomized material forms tiny droplets that come into full contact with the hot air, achieving efficient drying before falling into the drying chamber 2 for storage. The opening cycle of the discharge valve is pre-set. When feeding, the discharge valve is closed; when the valve is open, the dried material falls into the mixing tank 1, where it is thoroughly mixed under the action of the stirring paddle 10, and then discharged through the discharge port 14 to proceed to the next process.

[0038] It should be noted that this invention is not only applicable to the preparation of lithium iron phosphate cathode materials, but also to other situations where materials need to be dried separately before mixing.

[0039] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0040] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A multi-component grinding and mixing apparatus, comprising a mixing tank (1), characterized in that, It also includes at least two non-communicating drying chambers (2) located at the top of the mixing tank (1). The drying chamber (2) is provided with a discharge valve at the bottom and a feeding mechanism (3) at the top. The feeding mechanism (3) includes an atomizer (33), a feed inlet (31) and an air inlet (32) respectively located on both sides of the atomizer (33).

2. The multi-component grinding and mixing apparatus according to claim 1, characterized in that, The air inlet (32) is connected to a spiral duct (4).

3. The multi-component grinding and mixing apparatus according to claim 2, characterized in that, The air inlet end of the spiral duct (4) is equipped with a heater (5) and a fan (6).

4. The multi-component grinding and mixing apparatus according to claim 1, characterized in that, All air inlets (32) are arranged outward from the center of the mixing tank (1).

5. The multi-component grinding and mixing apparatus according to claim 3, characterized in that, The air inlet of the fan (6) is connected to a filter (7).

6. The multi-component grinding and mixing apparatus according to claim 1, characterized in that, The feed inlet (31) is connected to a feed pump (8).

7. The multi-component grinding and mixing apparatus according to claim 1, characterized in that, The mixing tank (1) is provided with a rotating shaft (9), and a stirring paddle (10) is arranged circumferentially on the rotating shaft (9); the rotating shaft (9) is connected and fixed to the mixing tank (1) by a bushing (11).

8. The multi-component grinding and mixing apparatus according to claim 7, characterized in that, The mixing tank (1) is connected to a power unit (12); the power unit (12) includes a motor (121), a transmission shaft (122) connected to the motor (121), and a first transmission gear (123) located at the end of the transmission shaft (122); a second transmission gear (13) is provided at the top of the rotating shaft (9), and the first transmission gear (123) and the second transmission gear (13) mesh with each other.

9. The multi-component grinding and mixing apparatus according to claim 1, characterized in that, The mixing tank (1) is provided with a discharge port (14) at the bottom.

Images