Device for continuously preparing high-nickel ternary material
By designing a device for continuously preparing high-nickel ternary materials, using nitrogen atmosphere and online monitoring system, the problem of artificial intervention in the preparation process cannot be maintained, and the yield and stability of the material are improved.
Patent Information
- Application Number
- CN202420769085.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-15
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-04-15
AI Technical Summary
During the preparation of high-nickel ternary materials, artificial intervention is required to maintain a dry gas atmosphere, which affects the material performance and yield.
A device for continuously preparing high-nickel ternary materials is designed, including lithium hydroxide drying and crushing system, mixing system, sintering system and online monitoring system. By setting up a nitrogen inlet, a nitrogen outlet and a vacuum outlet, the nitrogen atmosphere during the mixing process is ensured and artificial intervention is reduced.
It realizes the automatic dry gas atmosphere during the preparation of high-nickel ternary materials, reduces artificial intervention, improves the yield and stability of the material, and ensures product quality.
Smart Images
Figure CN222586353U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of high-nickel ternary materials, in particular to a device for continuously preparing high-nickel ternary materials. Background Art
[0002] Lithium hydroxide is one of the three basic lithium salts in the downstream of the lithium industry chain. Its main forms include anhydrous lithium hydroxide and monohydrate lithium hydroxide. It is widely used in the manufacturing of high-performance positive electrode materials for power batteries, especially high-nickel ternary positive electrode materials. High-nickel ternary materials such as NCM811 and NCA are important components in the field of power batteries and are widely used in new energy vehicles and other occasions. The production of these materials requires high-temperature sintering of 700 to 800°C, and anhydrous lithium hydroxide has the characteristics of low melting point and strong reaction activity, so it has become an inevitable choice for the production of high-nickel ternary materials.
[0003] The performance of high-nickel ternary materials depends in part on the properties of lithium hydroxide materials. Lithium hydroxide monohydrate has a high melting point and produces more water during the high-temperature solid-phase process, which greatly affects the excellent performance of high-nickel ternary materials.
[0004] The preparation of high-nickel ternary materials has high environmental requirements and requires a dry oxygen atmosphere to meet its reaction needs. The existing technology requires human intervention during the preparation process and cannot maintain a dry gas atmosphere. Utility Model Content
[0005] The purpose of the utility model is to provide a device for continuously preparing high-nickel ternary materials, so as to solve the technical problem in the prior art that human intervention is required during the preparation process of high-nickel ternary materials and a dry gas atmosphere cannot be maintained.
[0006] The utility model discloses a device for continuously preparing high-nickel ternary materials, comprising a lithium hydroxide drying and crushing system, wherein the lithium hydroxide drying and crushing system is connected to a mixing system, wherein the mixing system is connected to a sintering system, and an online monitoring system is arranged in the device;
[0007] The mixing system comprises a stirring mixer, and the stirring mixer is provided with a nitrogen inlet, a nitrogen outlet and a vacuum port;
[0008] The stirring mixer is connected with a screening and dispersing device, and the screening and dispersing device is connected with a dispersing and collecting bin.
[0009] By setting a nitrogen inlet, a nitrogen outlet and a vacuum port, the equipment can be evacuated to a vacuum through the vacuum port, and then nitrogen is introduced through the nitrogen inlet to a slightly positive pressure and part of the gas is discharged through the nitrogen outlet. This cycle is repeated 2 to 3 times to ensure that the mixing atmosphere is nitrogen. During the mixing process, nitrogen can also be introduced through the nitrogen inlet to purge the bottom material of the mixer to facilitate more uniform mixing.
[0010] By installing the screening and breaking device between the stirring mixer and the breaking and collecting bin, the uniformity of the mixing can be ensured, the quality of the material can be guaranteed, and the flow of materials can be reduced, saving time and cost.
[0011] Furthermore, a mixing agitator is provided in the stirring and mixing machine.
[0012] Furthermore, the screening and breaking device includes a screen and a vibration device, and the screen specification is 100 to 400 meshes.
[0013] Furthermore, the screen has at least two layers. The multi-layer screen enhances the screening and breaking effect.
[0014] Furthermore, the scattering and collecting bin is a double-layer structure, and the materials enter the lower layer from the upper layer.
[0015] Furthermore, the lower layer of the scattered collection bin is connected to a roller kiln through a slidable discharge pipe, and the roller kiln is connected to a sagger, and rollers are arranged under the sagger, and pressure sensors and vibrators are installed under the rollers. The stop signal is transmitted through the pressure sensor, and then the slidable discharge pipe moves left and right to fill the sagger in turn. When the sagger material is filled to the required specifications, the vibrator starts to vibrate slightly to make the material relatively flat.
[0016] Furthermore, the lithium hydroxide drying and crushing system includes a drying structure and a crushing structure, the drying structure includes a conveyor belt, part of the conveyor belt is located in an oven, and the oven is connected to a drying collection bin; the crushing structure includes a crushing feed bin, the crushing feed bin is connected to a disc air flow mill, the disc air flow mill is connected to a cyclone separation collector, and the cyclone separation collector is connected to a pulse dust collector.
[0017] Furthermore, the pulse dust collector is connected to an induced draft fan. By setting the induced draft fan, the pressure in the pulse dust collector is adjusted and stabilized to ensure the uniformity of the inhaled fine powder and avoid affecting the product quality.
[0018] Furthermore, the cyclone separation collector is connected to a crushing collection bin, which is divided into an upper and lower layer. After the material in the upper layer meets the test results of the online monitoring system, the material is passed into the lower layer for standby.
[0019] Furthermore, the online monitoring system includes a particle size monitoring system and a moisture monitoring system, and the particle size monitoring system and the moisture monitoring system are located in the lithium hydroxide drying and crushing system.
[0020] Furthermore, the sintering system includes a roller kiln, and a simplified heater is provided in the roller kiln to provide a corresponding temperature when the material is sintered.
[0021] Furthermore, the roller kiln is provided with a kiln air inlet and a kiln air outlet. By providing the kiln air inlet and the kiln air outlet, the oxygen atmosphere required for the reaction of the high-nickel ternary precursor and the anhydrous lithium hydroxide can be provided, and the flowing atmosphere can improve the reaction efficiency and take away part of the moisture generated by the reaction.
[0022] Compared with the prior art, the utility model has the following beneficial effects:
[0023] 1. The utility model combines the preparation of anhydrous lithium hydroxide from lithium hydroxide monohydrate with the preparation of high-nickel ternary materials to form a continuous preparation process, which greatly reduces the exposure time of the materials in the air and the situation of human intervention, and improves the yield and stability of high-nickel ternary materials;
[0024] 2. The combination of equipment and reduced human intervention can ensure the quality of high-nickel ternary products;
[0025] 3. By setting the nitrogen inlet, nitrogen outlet and vacuum port, the equipment can be evacuated to vacuum through the vacuum port first, and then nitrogen is introduced through the nitrogen inlet to a slightly positive pressure and then part of the gas is discharged through the nitrogen outlet to ensure that the mixing atmosphere is nitrogen. During the mixing process, nitrogen can also be introduced through the nitrogen inlet to purge the bottom material of the mixer to facilitate more uniform mixing;
[0026] 4. By installing the screening and breaking device between the stirring mixer and the breaking and collecting bin, the uniformity of the mixing can be ensured, the quality of the material can be guaranteed, and the flow of materials can be reduced, saving time and cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0028] Figure 1 This is a schematic diagram of the structure of the device for continuously preparing high-nickel ternary materials according to the utility model.
[0029] In the above drawings, the meanings of the various marks are: 1-stirring mixer, 2-nitrogen inlet, 3-nitrogen outlet, 4-vacuum outlet, 5-screening and dispersing device, 6-dispersing and collecting bin, 7-mixing agitator, 8-discharging pipe, 9-roller kiln, 10-sagger, 11-roller, 12-conveyor belt, 13-oven, 14-drying and collecting bin, 15-crushing and feeding bin, 16-disc jet mill, 17-cyclone separation collector, 18-pulse dust collector, 19-induced draft fan, 20-crushing and collecting bin, 21-kiln air inlet, 22-kiln air outlet. DETAILED DESCRIPTION
[0030] In order to make the purpose, technical solutions and advantages of the implementation methods of the utility model clearer, the technical solutions in the implementation methods of the utility model are clearly and completely described below. Obviously, the described implementation methods are only part of the implementation methods of the utility model, not all of the implementation methods.
[0031] Example 1
[0032] This embodiment discloses a device and method for continuously preparing high-nickel ternary materials. The specific structure is as follows: Figure 1 as shown, and includes the following steps:
[0033] Lithium hydroxide monohydrate is discharged onto a heatable conveyor belt 12, which runs in the main body of the oven 13. During this period, the temperature of the conveyor belt 12 is 50-200°C, the material is heated for 120-480 min (adjustable duration), and the working vacuum is -0.095-0.099 MPa (G) to facilitate the removal of evaporated water. Subsequently, the material is cooled to about 40°C on the last layer of the heatable conveyor belt 12, and the obtained anhydrous lithium hydroxide is conveyed to the drying collection bin 14; then the anhydrous lithium hydroxide enters the crushing system through the crushing feed bin 15, and is airflow crushed in the disc airflow mill 16. The gas used is a protective gas (nitrogen). The particle size of the anhydrous lithium hydroxide is adjusted by adjusting the air pressure of the crushing airflow. The crushed product must meet the standard "YS / T1568-2022 Battery Grade Non-aqueous Lithium Hydroxide The particle size requirement in "Anhydrous Lithium Hydroxide" is that D50 is 3-20μm. The crushed material is separated from the over-crushed particles (fine powder with too small particle size) by the cyclone separation collector 17 to the pulse dust collector 18 for recycling. During this period, the induced draft fan 19 mainly adjusts and stabilizes the pressure in the pulse dust collector 18 to ensure the uniformity of the inhaled fine powder to avoid affecting the product quality. The qualified materials are collected into the crushing collection bin 20 through the cyclone separation collector 17. This collection bin is divided into two layers. The materials in the upper layer are passed to the lower layer for standby after the test results of the online monitoring system meet the standards; the online monitoring system mainly adds a material inlet, a particle size monitoring system and a moisture monitoring system between the cyclone separation collector 17 and the crushing collection bin 20. The real-time testing of the particle size and moisture content determines whether the material meets the standards. The compliance requirements are the requirements mentioned in the standard "YS / T 1568-2022 Battery Grade Anhydrous Lithium Hydroxide", that is, the median particle size (D50) ranges from 3μm to 20μm, and the main content of LiOH is not less than 99.0%.
[0034] Prepare qualified anhydrous lithium hydroxide into the stirring mixer through the anhydrous lithium hydroxide feed port, and at the same time add a high nickel ternary precursor material of suitable proportion through the high nickel ternary precursor feed port, the specific ratio is n (LiOH): n (N9 precursor) = 1.01 ~ 1.05, the amount of lithium source added is slightly more than the precursor, mainly considering that the loss of lithium source during the sintering process is higher than that of the ternary precursor, add the material with suitable proportion to the stirring mixer 1 and stir and mix it through the mixing agitator 7, the stirring time is 2 ~ 6h, during which the nitrogen inlet 2 is mainly used for nitrogen outlet Port 3 and vacuum port 4 replace the gas in the stirring mixer 1 before the material enters. First, the equipment is evacuated to a vacuum through the vacuum port 4, and then nitrogen is introduced through the nitrogen inlet 2 to a slightly positive pressure and then part of the gas is discharged through the nitrogen outlet 3. This cycle is repeated 2 to 3 times to ensure that the mixing atmosphere is nitrogen. During the mixing process, nitrogen can also be introduced through the nitrogen inlet 2 to purge the bottom material of the mixer to facilitate more uniform mixing. The mixing time is 2 to 6 hours. To prevent the temperature of the stirring mixer from being too high during the mixing process, intermittent operation or the introduction of cooled nitrogen for cooling can be considered.
[0035] After the mixing is completed, the material is dispersed and screened by a screening and breaking device 5 (mainly composed of a screen and a vibration device, the screen specifications are 100-400 meshes, and a multi-layer screen can be used to enhance the screening and breaking effect. The vibration device is installed on the outer wall of the equipment, mainly used to allow most of the material to enter the crushing and collecting bin 20 smoothly) to obtain a mixed material with a relatively uniform particle size and then enter the crushing and collecting bin 20. The crushing and collecting bin 20 is still a double-layer structure. The upper layer can be sampled and tested to check the mixing situation. It is mainly done by taking out a little material and flattening it, and sliding a smooth baffle across its surface. If there is no obvious granularity and white scratches, the mixture is qualified. After it is qualified, it enters the lower crushing and collecting bin 20. The material will undergo gas replacement before and after entering the lower crushing and collecting bin 20, replacing the original nitrogen with oxygen.
[0036] The lower crushing and collecting bin 20 is used in conjunction with the roller kiln 9. The two are connected by a slidable discharge pipe 8. The slidable discharge pipe 8 is retractable and can slide in a direction perpendicular to the conveying direction of the roller kiln 9 above the roller kiln 9 through a sliding device to facilitate discharging of materials from the material collection bin into the sagger 10 of the roller kiln 9. Below the sagger 10 is a roller 11. A pressure sensor and a vibrator are installed below the roller 11. During the process of material lowering, a stop signal is transmitted through the sensor, and then the discharge pipe 8 moves left and right to fill four saggers 10 in turn. After the material in the sagger 10 is loaded to the required specifications, the vibrator starts to vibrate slightly, making the material relatively flat. It is smooth, but not too smooth, otherwise it will affect the contact between the material and oxygen, thereby affecting the reaction; a simplified heater is provided in the roller kiln 9, which is mainly used to provide the corresponding temperature when the material is sintered. The sintering temperature is 700°C. The sintering time is controlled by the rolling speed of the roller 11. The sintering time is 12 hours. The kiln air inlet 21 and the kiln air outlet 22 are mainly used to provide the oxygen atmosphere required for the reaction of the high-nickel ternary precursor and the anhydrous lithium hydroxide, and are flowing atmospheres, which can improve the reaction efficiency and take away part of the moisture generated by the reaction. Natural cooling is carried out at the tail of the kiln. After cooling, it can be manually packaged and collected for the next step of fine processing to obtain high-performance high-nickel ternary materials.
[0037] The above are the implementation methods listed in this embodiment, but this embodiment is not limited to the above optional implementation methods. Those skilled in the art can arbitrarily combine the above methods to obtain other various implementation methods. Anyone can derive other various forms of implementation methods under the inspiration of this embodiment. The above specific implementation methods should not be understood as limiting the scope of protection of this embodiment. The scope of protection of this embodiment shall be based on the definition in the claims, and the description can be used to interpret the claims.
Claims
1. A device for continuously preparing high-nickel ternary materials, characterized in that: It comprises a lithium hydroxide drying and crushing system, wherein the lithium hydroxide drying and crushing system is connected to a mixing system, wherein the mixing system is connected to a sintering system, and an online monitoring system is provided in the device; The mixing system comprises a stirring mixer (1), wherein the stirring mixer (1) is provided with a nitrogen inlet (2), a nitrogen outlet (3) and a vacuum outlet (4); The stirring mixer (1) is connected to a screening and scattering device (5), and the screening and scattering device (5) is connected to a scattering and collecting bin (6).
2. The device for continuously preparing high-nickel ternary materials according to claim 1, characterized in that: The stirring and mixing machine (1) is provided with a mixing agitator (7).
3. The device for continuously preparing high-nickel ternary materials according to claim 1, characterized in that: The scattering and collecting bin (6) is a double-layer structure, and the materials enter the lower layer from the upper layer.
4. The device for continuously preparing high-nickel ternary materials according to claim 3, characterized in that: The lower layer of the scattered collection bin (6) is connected to a roller kiln (9) through a slidable discharge pipe (8), and the roller kiln (9) is connected to a sagger (10). A roller (11) is arranged below the sagger (10), and a pressure sensor and a vibrator are installed below the roller (11).
5. The device for continuously preparing high-nickel ternary materials according to claim 1, characterized in that: The lithium hydroxide drying and crushing system comprises a drying structure and a crushing structure. The drying structure comprises a conveyor belt (12). Part of the conveyor belt (12) is located in an oven (13). The oven (13) is connected to a drying collection bin (14).
6. The device for continuously preparing high-nickel ternary materials according to claim 5, characterized in that: The crushing structure comprises a crushing feed bin (15), the crushing feed bin (15) is connected to a disc airflow mill (16), the disc airflow mill (16) is connected to a cyclone separation collector (17), and the cyclone separation collector (17) is connected to a pulse dust collector (18).
7. The device for continuously preparing high-nickel ternary materials according to claim 6, characterized in that: The cyclone separation collector (17) is connected to a crushing collection bin (20), and the crushing collection bin (20) is divided into an upper and lower layer. After the material in the upper layer meets the test results of the online monitoring system, the material is passed into the lower layer for standby.
8. The device for continuously preparing high-nickel ternary materials according to claim 1, characterized in that: The online monitoring system includes a particle size monitoring system and a moisture monitoring system, and the particle size monitoring system and the moisture monitoring system are located in the lithium hydroxide drying and crushing system.
9. The device for continuously preparing high-nickel ternary materials according to claim 1, characterized in that: The sintering system comprises a roller kiln (9), in which a simplified heater is arranged.
10. The device for continuously preparing high-nickel ternary materials according to claim 9, characterized in that: The roller kiln (9) is provided with a kiln air inlet (21) and a kiln air outlet (22).