Lithium manganate preparation mechanism

Abstract

The utility model relates to the field of sintering devices, in particular to a lithium manganate preparation mechanism which comprises a sintering furnace with a first air inlet, the first air inlet of the sintering furnace is communicated with an air inlet device, and the air inlet device comprises an adsorption assembly. The adsorption assembly is used for adsorbing nitrogen, moisture and titanium dioxide in air. On one hand, heat loss during exhaust gas emission can be effectively reduced, energy consumption in the lithium manganate preparation process is reduced, and on the other hand, the temperature in the reaction mechanism can be conveniently kept stable, an oxygen-enriched environment is conveniently provided in the sintering furnace, and the quality of the prepared lithium manganate is improved.

Description

Technical Field

[0001] The utility model relates to the field of sintering devices, in particular to a lithium manganate preparation mechanism. Background Art

[0002] During the lithium manganate production process, air is introduced into the reaction chamber, where oxygen in the air reacts chemically with the reactants in the chamber to produce lithium manganate. After the reaction is complete, the waste gas is promptly discharged from the chamber. The large amount of air introduced during lithium manganate production also produces a large amount of waste gas. When this large amount of waste gas is discharged from the reaction chamber, it removes a significant amount of heat from the chamber.

[0003] However, the lithium manganese oxide production process requires a heating device to maintain a certain temperature. The large amount of exhaust gas discharged causes severe heat loss within the reaction mechanism, requiring the heating device to continuously heat and maintain the temperature within the reaction mechanism. There are also cases where the heating device cannot meet the heating and heat preservation requirements, resulting in large temperature deviations within the reaction mechanism, which in turn leads to a decrease in the quality of the lithium manganese oxide produced. Utility Model Content

[0004] In order to reduce heat loss during exhaust gas discharge, maintain temperature stability in a reaction mechanism, and ensure the quality of prepared lithium manganate, the utility model provides a lithium manganate preparation mechanism.

[0005] The utility model provides a lithium manganate preparation mechanism, which adopts the following technical solutions:

[0006] A lithium manganate preparation mechanism, comprising a sintering furnace and an air intake device;

[0007] The air inlet device is connected to the sintering furnace through a first air inlet provided on the sintering furnace;

[0008] The air intake device includes an adsorption component.

[0009] In a specific embodiment, a buffer component is connected between the adsorption component and the sintering furnace.

[0010] In a specific embodiment, the adsorption assembly includes an adsorption cylinder having a second air inlet and a second air outlet, and an adsorption layer, and the adsorption layer is disposed in the adsorption cylinder.

[0011] In a specific embodiment, the adsorption layer is provided with at least two layers, and a separation layer is provided between adjacent adsorption layers.

[0012] In a specific embodiment, the separation layer is a separation net.

[0013] In a specific possible implementation manner, the second air inlet of the adsorption cylinder is arranged below the second air outlet.

[0014] In a specific embodiment, the adsorption layers are stacked one above the other, and the thickness of the upper adsorption layer is greater than that of the lower adsorption layer.

[0015] In a specific embodiment, the air intake device includes a filter assembly, and the filter assembly includes a filter cartridge.

[0016] In a specific possible implementation scheme, a power element is provided between the filtration component and the adsorption component.

[0017] In a specific embodiment, a temperature measuring element is provided in the sintering furnace.

[0018] In summary, the present invention has at least one of the following beneficial technical effects:

[0019] 1. The adsorption component is used to filter out impurities and gases other than oxygen in the air, thereby increasing the oxygen content in the gas entering the sintering furnace and reducing the waste gas generated during the reaction, thereby reducing the discharge of waste gas, reducing the heat loss in the sintering furnace, and facilitating the temperature stability in the sintering furnace, thereby ensuring the quality of the produced lithium manganese oxide.

[0020] 2. The gas introduced into the sintering furnace is buffered and cached through the buffer device, which facilitates the stable introduction of gas into the sintering furnace and improves the reaction stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure.

[0022] Figure 2 It is a cross-sectional view showing the internal structure of the adsorption cylinder.

[0023] Figure 3 It is a cross-sectional view showing the internal structure of the sintering furnace.

[0024] Explanation of the accompanying drawings: 1. Sintering furnace; 11. Temperature measuring element; 12. Heating element; 13. Cooling pipe; 2. Filter assembly; 3. Adsorption assembly; 31. Adsorption cylinder; 32. First adsorption layer; 32. Second adsorption layer; 4. Cache assembly; 5. Power element; 6. Partition net; 7. Second air inlet; 8. Second air outlet; 9. First air inlet. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-3 The utility model is described in further detail.

[0026] Reference Figure 1A lithium manganese oxide preparation mechanism includes a sintering furnace 1 and an air intake device. The air intake device is connected to the sintering furnace 1 through a first air inlet 9 provided on the sintering furnace. The air intake device effectively increases the oxygen content in the gas entering the sintering furnace 1 by filtering and adsorbing the air, thereby providing an oxygen-rich environment for the preparation process of lithium manganese oxide, effectively reducing the defects of the prepared lithium manganese oxide crystals, and thus effectively improving the electrochemical properties of batteries using lithium manganese oxide as an electrode active material, such as cycle performance. On the other hand, in the preparation process of lithium manganese oxide, oxygen is mainly consumed, and other gases become waste gas together with the generated carbon dioxide. By filtering the air, it is no longer ordinary air that is passed into the sintering furnace 1, but a gas with an oxygen content greater than or equal to 80%, thereby reducing the amount of waste gas generated, thereby reducing the heat loss generated during the exhaust gas discharge process, and facilitating the control and maintenance of the temperature in the sintering furnace 1, thereby ensuring the quality of the prepared lithium manganese oxide.

[0027] In this embodiment, the air intake device includes an adsorption component 3. The adsorption component 3 adsorbs and retains components other than oxygen in the air, thereby greatly increasing the oxygen content in the gas introduced into the sintering furnace 1.

[0028] As one implementation of this embodiment, the air intake device further includes a buffer assembly 4. Specifically, the buffer assembly 4 is connected between the adsorption assembly 3 and the sintering furnace 1. The amount of gas adsorbed by the adsorption assembly 3 is affected by the adsorption capacity of the adsorption material in the adsorption assembly 3, causing the speed of the gas entering the sintering furnace 1 to fluctuate, affecting the sintering process of the lithium manganese oxide. By providing the buffer assembly 4, the gas first enters the buffer assembly and then enters the sintering furnace 1 at a uniform speed. The buffer assembly 4 includes a buffer tank.

[0029] As one implementation of this embodiment, the air intake device further includes a filter assembly 2, which includes a filter cartridge. Filter assembly 2 is disposed at the front end of adsorption assembly 3 and filters dust and particulate matter in the air to prevent them from damaging component structures at the back end of the process. The filter cartridge includes a filter screen structure.

[0030] Reference Figure 2 The adsorption assembly 3 includes an adsorption cylinder 31 having a second air inlet 7 and a second air outlet 8, and an adsorption layer. The second air inlet 7 of the adsorption cylinder 31 is located at the bottom end of the adsorption cylinder 31, and the second air outlet 8 of the adsorption cylinder 31 is located at the top end of the adsorption cylinder 31. The adsorption layer has two layers. For ease of description, the first adsorption layer 32 and the second adsorption layer 32 are used to distinguish them. The first adsorption layer 32 and the second adsorption layer 32 are stacked vertically in the adsorption cylinder 31. A partition net 6 is provided between the first adsorption layer 32 and the second adsorption layer 32 for isolation. The partition net 6 is specifically a stainless steel wire mesh.

[0031] Reference Figure 1and Figure 2 The gas enters the adsorption cylinder 31 from the second air inlet 7, the first adsorption layer 32 adsorbs moisture and carbon dioxide in the gas, and the second adsorption layer 32 adsorbs nitrogen in the gas.

[0032] As one of the implementation modes of this embodiment, a power element 5 is provided between the filter component 2 and the adsorption component 3. Specifically, the pipeline between the filter component 2 and the adsorption component 3 is connected with a power element 5, such as a blower, which pressurizes the gas discharged from the filter component 2 so that the gas can enter from the first air inlet below the adsorption cylinder 31 and be discharged from the first air outlet above, which helps the smooth progress of the adsorption process. On the other hand, by providing the power element 5, the gas can be transported into the adsorption component 3 at a faster speed, thereby improving production efficiency.

[0033] In a preferred embodiment, the first adsorption layer 32 is disposed below the second adsorption layer 32 , and the thickness of the first adsorption layer 32 is less than the thickness of the second adsorption layer 32 .

[0034] Because the second air inlet 7 is located below the second air outlet 8, the gas flows from bottom to top within the adsorption tube 31, allowing the gas to preferentially pass through the first adsorption layer 32. The first adsorption layer 32 effectively removes moisture and carbon dioxide from the gas, preventing moisture, carbon dioxide, and other components in the gas from affecting the adsorption material in the second adsorption layer 32, thereby helping to improve the nitrogen absorption effect of the second adsorption layer 32. Furthermore, since the air contains more nitrogen and less carbon dioxide and moisture, the thicker second adsorption layer 32 is used to more comprehensively adsorb nitrogen, further increasing the oxygen content in the gas. The adsorption material in the first adsorption layer 32 is a high-efficiency water-absorbing material such as aluminum oxide particles or molecular sieves, while the adsorption material in the second adsorption layer 32 is a molecular sieve.

[0035] In a specific embodiment, referring to Figure 1 , a filter component 2, an adsorption component 3, a cache component 4 are sequentially arranged along the gas flow direction, and a sintering furnace 1 having a first air inlet 9 and a first air outlet. A filter is installed in the filter component 2. After the air enters the filter component 2, the filter performs a preliminary filtration on the air to remove dust particles in the air, and then transports it to the adsorption component 3. The adsorption component 3 further filters the gas to remove nitrogen, moisture, carbon dioxide and other components in the air, and improve the purity of oxygen in the gas. It is then sent to the cache component 4. The cache component 4 buffers and caches the gas and transports the gas smoothly to the sintering furnace 1. The gas enters the sintering furnace 1 from the first air inlet 9 to react, and is discharged from the air outlet after the reaction is completed.

[0036] Reference Figure 3A heating element 12 is installed in the sintering furnace 1. The heating element 12 is used to increase the temperature in the furnace and sinter the raw materials for preparing lithium manganese oxide.

[0037] As one implementation of this embodiment, the heating elements 12 are arranged on both sides of the furnace in the horizontal direction. For example, the heating elements 12 are a plurality of connected rod-shaped structures, which can provide a high temperature of more than 1000°C into the furnace.

[0038] Illustratively, primary sintering and secondary sintering are performed in a sintering furnace, wherein the primary sintering temperature ranges from 450 to 650° C., the primary sintering time is 5 to 10 hours, and the secondary sintering temperature ranges from 650 to 850° C., the secondary sintering time is 10 to 20 hours.

[0039] As one implementation of this embodiment, the sintering furnace 1 further includes a cooling structure. The cooling structure includes cooling pipes 13 distributed on the top of the furnace for heat exchange medium to pass through. The heat exchange medium can be cooling water or cooling gas.

[0040] A temperature measuring element 11 , such as a temperature sensor, is also installed in the sintering furnace 1 to monitor the temperature in the sintering furnace 1 in real time, so as to control the flow rate and flow rate of the gas in the sintering furnace 1 according to the temperature change.

[0041] The sintering furnace 1 also includes a feed port for raw materials to enter the furnace. For example, the raw materials include lithium-containing compounds and manganese-containing compounds. The lithium-containing compounds include one or more of lithium carbonate, lithium hydroxide, lithium fluoride, lithium oxalate, and lithium sulfate. The manganese-containing compounds include manganese tetraoxide, electrolytic manganese dioxide, and the like.

[0042] In order to further improve the quality of the prepared lithium manganese oxide, the raw materials may be pre-mixed and then placed in the sintering furnace 1 for sintering. The device for pre-mixing may be a ball milling device.

[0043] The sintering furnace 1 further includes a first gas outlet (not shown in the figure) for discharging waste gas from the sintering furnace during or after the reaction is completed. Furthermore, the first gas outlet is connected to an external exhaust pipe.

[0044] The implementation principle of the embodiment of the present utility model is as follows: the outside air enters the filter assembly 2, and is filtered by the filter mesh in the filter assembly 2, and the air is simply filtered to remove dust, particulate impurities and other substances in the air. The power element 5 pressurizes the gas discharged from the filter assembly 2 and transports it to the adsorption cylinder 31 through a pipeline. The first adsorption layer 32 and the second adsorption layer 32 in the adsorption cylinder 31 further filter the gas to eliminate a large amount of impurities in the gas, so that the proportion of oxygen in the gas is greater than or equal to 80%. The filtered gas is sent to the cache assembly 4 for caching. The temperature measuring element 11 in the sintering furnace 1 monitors the temperature in the sintering furnace 1 in real time, so as to control the rate at which the cache assembly 4 transports gas to the sintering furnace 1 and the working power of the heating element 12 according to the temperature change in the sintering furnace 1.

[0045] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A lithium manganate preparation mechanism, characterized in that: It comprises a sintering furnace (1) and an air intake device; The air inlet device is connected to the sintering furnace (1) via a first air inlet (9) provided on the sintering furnace (1); The air intake device comprises an adsorption component (3).

2. The lithium manganate preparation mechanism according to claim 1, wherein: A cache component (4) is connected between the sintering furnace (1) and the adsorption component (3).

3. The lithium manganate preparation mechanism according to claim 1, characterized in that: The adsorption assembly (3) comprises an adsorption cylinder (31) having a second air inlet (7) and a second air outlet (8), and an adsorption layer, wherein the adsorption layer is arranged in the adsorption cylinder (31).

4. The lithium manganate preparation mechanism according to claim 3, characterized in that: The adsorption layer is provided with at least two layers, and a separation layer is provided between adjacent adsorption layers.

5. The lithium manganate preparation mechanism according to claim 4, characterized in that: The separation layer is a separation net (6).

6. The lithium manganate preparation mechanism according to claim 3, characterized in that: The second air inlet (7) of the adsorption cylinder (31) is arranged below the second air outlet (8).

7. The lithium manganate preparation mechanism according to claim 3, characterized in that: The adsorption layers are stacked one above the other, and the thickness of the upper adsorption layer is greater than that of the lower adsorption layer.

8. The lithium manganate preparation mechanism according to claim 1, characterized in that The air intake device comprises a filter assembly (2), and the filter assembly comprises a filter cartridge.

9. The lithium manganate preparation mechanism according to claim 8, characterized in that: A power element (5) is provided between the filter assembly (2) and the adsorption assembly (3).

10. The lithium manganate preparation mechanism according to claim 1, characterized in that: A temperature measuring element (11) is provided in the sintering furnace (1).

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