A rotary kiln for the production of tricobalt tetroxide

Abstract

This utility model discloses a rotary kiln for preparing cobalt tetroxide, comprising a kiln body, a feeding device, a dust removal device, and a cooling device. The kiln body has an inner cavity with a low-temperature zone and a high-temperature zone, the right end of which is connected to the left end of the high-temperature zone. The low-temperature zone is equipped with multiple first baffle assemblies and first lifting assemblies. Each first baffle assembly includes multiple first baffle plates, one side of which is connected to the inner circumferential wall of the kiln body, and the first baffle plates extend radially. The multiple first baffle plates in each first baffle assembly are spaced circumferentially. Each first lifting assembly includes multiple first lifting plates, one side of which is connected to the inner circumferential wall of the kiln body, and the first lifting plates extend axially. The discharge end of the feeding device is connected to the left end of the low-temperature zone. The extraction end of the dust removal device is connected to the inner cavity of the kiln, and the dust removal device is used to extract dust from the inner cavity of the kiln. The feed end of the cooling device is connected to the right end of the high-temperature zone, and the cooling device is used to cool the material.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a rotary kiln for preparing cobalt tetroxide. Background Technology

[0002] During the calcination of cobalt carbonate in a rotary kiln, the cobalt carbonate reacts gradually with oxygen at low and high temperatures to produce cobalt tetroxide. However, during sintering, if the material's residence time in the low-temperature zone is too short or the feed stability of the rotary kiln is low, the internal reaction of the particles may not be complete, causing the surface of the cobalt tetroxide formed when passing through the high-temperature zone to crack. Utility Model Content

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention proposes a rotary kiln for preparing cobalt tetroxide.

[0004] This utility model embodiment provides a rotary kiln for preparing cobalt tetroxide, the rotary kiln for preparing cobalt tetroxide comprising:

[0005] The kiln body has an inner cavity with a low-temperature zone and a high-temperature zone. The right end of the low-temperature zone is connected to the left end of the high-temperature zone. The kiln body can be driven to rotate around its own axis. The low-temperature zone is equipped with multiple first baffle assemblies and first lifting assemblies. The multiple first baffle assemblies are arranged at intervals along the axial direction of the kiln body. Each first baffle assembly includes multiple first baffle plates, one side of which is connected to the inner circumferential wall of the kiln body. The first baffle plates extend radially along the kiln body, and the multiple first baffle plates of each first baffle assembly are distributed at intervals along the circumference of the kiln body. Each first lifting assembly includes multiple first lifting plates, one side of which is connected to the inner circumferential wall of the kiln body. The first lifting plates extend axially along the kiln body, and the multiple first lifting plates are distributed at intervals along the circumference of the kiln body.

[0006] The feeding device has its discharge end connected to the left end of the low-temperature zone;

[0007] A dust removal device, the exhaust end of which is connected to the inner cavity of the kiln, is used to extract dust from the inner cavity of the kiln.

[0008] A cooling device, the feed end of which is connected to the right end of the high-temperature zone, is used to cool the material.

[0009] According to some embodiments of the present invention, a second lifting assembly is provided in the low-temperature zone. The second lifting assembly is located to the right of the first lifting assembly. The second lifting assembly includes a plurality of second lifting plates. One side of the second lifting plate is connected to the inner peripheral wall of the kiln body. The second lifting plate extends along the axial direction of the kiln body. The plurality of second lifting plates are distributed at intervals along the circumference of the kiln body. The plurality of first lifting plates and the plurality of second lifting plates are staggered.

[0010] According to some embodiments of the present invention, a second baffle assembly is provided at the left end of the high-temperature zone. The second baffle assembly includes a plurality of second baffle plates. One side of the second baffle plate is connected to the inner peripheral wall of the kiln body. The second baffle plate extends radially along the kiln body, and the plurality of second baffle plates are distributed at intervals along the circumference of the kiln body.

[0011] According to some embodiments of this utility model, a third lifting assembly and a fourth lifting assembly are provided in the high-temperature zone. The third lifting assembly includes multiple third lifting plates, one side of which is connected to the inner peripheral wall of the kiln body. The third lifting plates extend along the axial direction of the kiln body, and the multiple third lifting plates are distributed at intervals along the circumference of the kiln body. The fourth lifting assembly is located to the right of the third lifting assembly. The fourth lifting assembly includes multiple fourth lifting plates, one side of which is connected to the inner peripheral wall of the kiln body. The fourth lifting plates extend along the axial direction of the kiln body, and the multiple fourth lifting plates are distributed at intervals along the circumference of the kiln body. The multiple third lifting plates and the multiple fourth lifting plates are staggered.

[0012] According to some embodiments of the present invention, the kiln body is a first roller, and the rotary kiln for preparing cobalt tetroxide further includes a first base, a second base, and a first driving component. The first base is located to the left of the second base. The left end of the first roller is inserted into the inner cavity of the first base and rotatably connected to the first base. The right end of the first roller is inserted into the inner cavity of the second base and rotatably connected to the second base. The inner cavity of the first roller communicates with the inner cavities of the first base and the second base, respectively. The first driving component is used to drive the first roller to rotate around its own axis.

[0013] According to some embodiments of this utility model, the feeding device includes a storage bin, a weighing pipe, and a first discharge pipe. The discharge end of the storage bin is connected to the upper end of the weighing pipe, and the lower end of the weighing pipe is connected to the left end of the first discharge pipe. The right end of the first discharge pipe passes through the first base and is inserted into the inner cavity of the first roller and communicates with the low-temperature zone. The first discharge pipe is inclined downward from left to right. The weighing pipe is provided with a first valve and a second valve. The first valve is located above the second valve, and a weighing area is formed between the first valve and the second valve. The weighing pipe is provided with a weighing sensor, which is used to weigh the material located in the weighing area.

[0014] According to some embodiments of the present invention, a third valve is provided between the lower end of the weighing tube and the upper end of the first feeding tube.

[0015] According to some embodiments of the present invention, the dust removal device includes a bag filter, an induced draft fan, and an exhaust pipe. The air inlet of the bag filter is connected to one end of the exhaust pipe, the other end of the exhaust pipe is connected to the inner cavity of the first base, the air outlet of the bag filter is connected to the air extraction end of the induced draft fan, and the second base is provided with a first air inlet.

[0016] According to some embodiments of this utility model, the cooling device includes a third base, a fourth base, a second roller, a second driving component, a second feeding pipe, a cooling sleeve, and a circulating water tank. The third base is located to the left of the fourth base. The left end of the second roller is inserted into the inner cavity of the third base and rotatably connected to the third base. The right end of the second roller is inserted into the inner cavity of the fourth base and rotatably connected to the fourth base. The second driving component is used to drive the second roller to rotate around its own axis. The inlet end of the second feeding pipe is connected to the inner cavity of the second base, and the outlet end of the second feeding pipe is inserted into the third base and connected to the inner cavity of the second roller. The second roller passes through and is rotatably connected to the cooling sleeve. The outlet pipe of the circulating water tank is connected to the cooling sleeve, and the circulating return pipe of the circulating water tank is connected to the cooling sleeve. The water in the cooling sleeve exchanges heat with the outer peripheral wall of the second roller.

[0017] According to some embodiments of the present invention, the fourth base is provided with a second air inlet, and the rotary kiln for preparing cobalt tetroxide further includes an exhaust fan, the air outlet of which is connected to the first air inlet and the second air inlet respectively.

[0018] The rotary kiln for preparing cobalt tetroxide according to the embodiments of this utility model has at least the following technical effects:

[0019] 1. The feeding device conveys the material into the inner cavity of the kiln. The material first enters the low-temperature zone of the kiln to react. As the kiln rotates, the material moves from left to right. The multiple first baffles of the first baffle assembly can block the material movement, thereby increasing the reaction time of the material in the low-temperature zone, allowing the material to be fully pre-decomposed, and the free water and crystal water to evaporate further, effectively preventing the material from entering the high-temperature zone for sintering and causing material cracking.

[0020] 2. The multiple first lifting plates of the first lifting assembly can lift the material passing through the first lifting plates, thereby making the material distribution uniform, the reaction uniform, and avoiding material accumulation.

[0021] 3. After the material has fully reacted in the low-temperature zone, it enters the high-temperature zone to the right for further reaction. After the reaction is completed, the material leaves the high-temperature zone and enters the cooling device for cooling. During the reaction process, the dust removal device simultaneously draws air into the kiln cavity to remove dust and exhaust gas from the kiln.

[0022] 4. The third valve is a rotary valve, which can feed material into the first feed pipe at a continuous and uniform rate, thereby avoiding the impact of material entering the kiln body. By controlling the rotation speed of the rotary valve, the feeding speed can be finely adjusted, further smoothing the feed flow rate and ensuring the stability and uniformity of the material layer thickness in the kiln body.

[0023] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0025] Figure 1 This is a schematic diagram of the rotary kiln used in some embodiments of the present invention for preparing cobalt tetroxide;

[0026] Figure 2 This is a schematic diagram of the structure of the feeding device according to some embodiments of the present invention;

[0027] Figure 3 This is a schematic diagram of the low-temperature zone of the kiln body in some embodiments of this utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the first material-blocking assembly according to some embodiments of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the first baffle plate installed on the kiln body according to some embodiments of this utility model;

[0030] Figure 6 This is a schematic diagram of the structure of the first baffle assembly installed on the kiln body according to some embodiments of this utility model;

[0031] Figure 7 This is a schematic diagram of the structure of the first and second lifting components in the low-temperature zone according to some embodiments of the present invention;

[0032] Figure 8 This is a schematic diagram of the structure of the first lifting plate in the low temperature zone according to some embodiments of this utility model;

[0033] Figure 9 This is a schematic diagram showing the connection between the first lifting plate and the kiln body in some embodiments of this utility model;

[0034] Figure 10 This is a schematic diagram of the high-temperature zone of the kiln body in some embodiments of this utility model;

[0035] Figure 11 This is a schematic diagram of the structure of a cooling device according to some embodiments of the present invention.

[0036] Icon labels:

[0037] Kiln body 100; First base 110; Second base 120; First roller 130; First drive component 140; First air inlet 150;

[0038] Low temperature zone 200; first baffle assembly 210; first baffle plate 211; first lifting assembly 220; first lifting plate 221; second lifting assembly 230; second lifting plate 231;

[0039] High temperature zone 300; second baffle assembly 310; second baffle plate 311; third lifting assembly 320; third lifting plate 321; fourth lifting assembly 330; fourth lifting plate 331;

[0040] Feeding device 400; storage bin 410; weighing pipe 420; first discharge pipe 430; weighing area 440; weighing sensor 450; first valve 461; second valve 462; third valve 463;

[0041] Dust removal device 500; bag filter 510; induced draft fan 520; exhaust pipe 530;

[0042] Cooling device 600; third base 610; fourth base 620; second roller 630; second drive component 640; second feed pipe 650; cooling sleeve 660; circulating water tank 670; second air inlet 680; exhaust fan 690; filter 691. Detailed Implementation

[0043] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0044] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. 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.

[0045] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0046] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0047] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0048] According to some embodiments of this utility model, refer to Figures 1 to 11The rotary kiln for preparing cobalt tetroxide includes a kiln body 100, a feeding device 400, a dust removal device 500, and a cooling device 600. The kiln body 100 is slightly inclined downwards from left to right, thereby guiding the material inside the kiln body 100 to move to the right. The inner cavity of the kiln body 100 has a low-temperature zone 200 and a high-temperature zone 300, with the right end of the low-temperature zone 200 connected to the left end of the high-temperature zone 300. Multiple first baffle assemblies 210 and first lifting assemblies 220 are provided within the low-temperature zone 200. The multiple first baffle assemblies 210 are arranged at intervals along the axial direction of the kiln body 100. Each first baffle assembly 210 includes multiple first baffle plates 211, one side of which is connected to the inner peripheral wall of the kiln body 100. The first baffle plates 211 extend radially along the kiln body 100, meaning the length direction of the first baffle plates 211 is radial to the kiln body 100. Each first baffle assembly 210 has multiple first baffle plates 211 spaced apart circumferentially along the kiln body 100. The first lifting assembly 220 includes multiple first lifting plates 221, one side of which is connected to the inner circumferential wall of the kiln body 100. The first lifting plates 221 extend axially along the kiln body 100, meaning their length direction is the axial direction of the kiln body 100. Multiple first lifting plates 221 are spaced apart circumferentially along the kiln body 100. The discharge end of the feeding device 400 is connected to the left end of the low-temperature zone 200. The extraction end of the dust removal device 500 is connected to the inner cavity of the kiln body 100, and the dust removal device 500 is used to extract dust from the inner cavity of the kiln body 100. The feed end of the cooling device 600 is connected to the right end of the high-temperature zone 300, and the cooling device 600 is used to cool the material. It should be noted that "circumferentially along the kiln body 100" refers to the circumferential direction along the inner wall of the kiln body 100.

[0049] The feeding device 400 conveys material into the inner cavity of the kiln body 100. The material first enters the low-temperature zone 200 of the kiln body 100 for reaction. For example, the low-temperature zone 200 can be set with four temperature zones, with the temperature range controlled between (150~650)±30℃. As the kiln body 100 rotates, the material moves from left to right. The multiple first baffles 211 of the first baffle assembly 210 can block the material movement, thereby increasing the reaction time of the material in the low-temperature zone 200, allowing the material to be fully pre-decomposed, and effectively preventing the material from cracking during sintering in the high-temperature zone 300. Extending the reaction time in the low-temperature zone 200 provides a relatively mild heating environment for the material, which helps the free water and crystal water in the material to evaporate fully and slowly, rather than instantly vaporizing in the high-temperature zone 300 and causing particle explosion. In this way, the material is fully pre-decomposed, preparing it for the final oxidation reaction in the high-temperature zone 300. This can reduce the defect rate caused by cracking by more than 50%.

[0050] The multiple first lifting plates 221 of the first lifting assembly 220 can lift the material passing through the first lifting plates 221, forming a material curtain in the air and scattering it, thereby ensuring uniform material distribution and reaction, and preventing material accumulation. Material accumulation will lead to an excessively thick material layer, and the material in the center will not react completely due to uneven heating and insufficient contact with oxygen. The design of the first lifting plates 221 allows the material particles to exchange heat and react more fully with the hot air and oxygen in the kiln body 100, which helps to improve the uniformity and thoroughness of the reaction, thereby improving product quality.

[0051] After the material has fully reacted in the low-temperature zone 200, it enters the high-temperature zone 300 to the right for further reaction. The high-temperature zone 300 can be configured with eight temperature zones, and the temperature threshold can be set to 800±30℃. After the reaction is complete, the material leaves the high-temperature zone 300 and enters the cooling device 600 for cooling. During the reaction process, the dust removal device 500 simultaneously extracts air into the kiln body 100 to remove dust and exhaust gas.

[0052] The first baffle assembly 210 and the first lifting assembly 220 work together to control the axial conveying speed of the material, while the first lifting assembly 220 optimizes the mixing effect of the material. Their combined operation enables the material to move slowly and frequently within the low-temperature zone 200.

[0053] Preferred, refer to Figure 4 Within the same first baffle assembly 210, multiple first baffle plates 211 are projected in a ring shape along the axial direction of the kiln body 100. The ring has multiple notches, which represent the distance between adjacent first baffle plates 211. This ring structure with notches effectively blocks most of the material, extending its residence time, while allowing some material to continue moving forward through the notches, creating an effect similar to a multi-stage reactor and preventing complete blockage. Specifically, refer to... Figure 4 A first stop assembly 210 can be composed of six identical annular steel plates forming six notches. The width of each notch can be set to w, where w = 5 ± X cm, and X is an adjustable tolerance range of 0–10 cm. This design allows for fine adjustment of the material throughput.

[0054] Reference Figure 5 and Figure 6Within the same first baffle assembly 210, adjacent first baffle plates 211 are spaced apart along the axial direction of the kiln body 100, specifically, the distance d1 between adjacent first baffle plates 211 in the left-right direction. This distance can be set to d1 = (1.5-2.0) ± X cm. When material passes through the first baffle assembly 210 from left to right, the first baffle plates 211 can evenly disperse the material. The material experiences some disturbance and dispersion as it passes through this axial distance, which helps to break up any potential material agglomerates and further promotes material uniformity. (Refer to...) Figure 9 The radial height of the first baffle plate 211 is d2, which can be set to d2 = 20 ± X cm. This height is sufficient to form an effective material dam, but not so high as to excessively obstruct the flow of materials. By adjusting the height, notch width, and axial spacing of the first baffle plate 211, the residence time distribution of materials with different properties in the low-temperature zone 200 can be flexibly controlled.

[0055] Preferred, refer to Figures 3 to 7 A second lifting assembly 230 is provided within the low-temperature zone 200. The second lifting assembly 230 is located to the right of the first lifting assembly 220. The second lifting assembly 230 includes multiple second lifting plates 231, one side of which is connected to the inner circumferential wall of the kiln body 100. The second lifting plates 231 extend axially along the kiln body 100, meaning their length direction is axial and horizontal. Multiple second lifting plates 231 are spaced apart circumferentially around the kiln body 100. (Refer to...) Figure 7 Multiple first lifting plates 221 and multiple second lifting plates 231 are staggered. Material passing from left to right through the first lifting plates 221 is blocked and dispersed by them. The dispersed material is then further dispersed by the second lifting plates 231, ensuring thorough dispersion. This staggered arrangement forms a three-dimensional material mixing network. When the kiln rotates, the material is not only lifted radially but also guided and dispersed axially, greatly increasing the complexity and randomness of material movement, thereby maximizing mixing efficiency. Within a temperature zone, 2+Y rings of lifting devices can be installed. Each lifting device is a combination of a first lifting component 220 and a second lifting component 230, ensuring that the material throughout the entire temperature zone is in an active tumbling state. Eight ± Y first lifting plates 221 can be set around the circumference of each first lifting component 220, and eight ± Y second lifting plates 231 can be set around the circumference of each second lifting component 230, where Y is 0 to 5. The axial lengths of the first lifting plate 221 and the second lifting plate 231 can be evenly divided according to the width of the temperature zone to achieve a uniform lifting effect covering the entire temperature zone. (Refer to...) Figure 9The radial height of the first lifting plate 221 is d3, which can be set to d3 = 2 + X cm. The radial height of the second lifting plate 231 is the same as that of the first lifting plate 221. This height achieves a balance between effective lifting and avoiding excessive impact on the material.

[0056] Preferred, refer to Figure 1 and Figure 10 A second baffle assembly 310 is provided at the left end of the high-temperature zone 300. The second baffle assembly 310 includes multiple second baffle plates 311. One side of each second baffle plate 311 is connected to the inner circumferential wall of the kiln body 100. The second baffle plates 311 extend radially along the kiln body 100, and the multiple second baffle plates 311 are distributed circumferentially at intervals along the kiln body 100. The second baffle assembly 310 has the same structure as the first baffle assembly 210, and will not be described again here. When material leaves the low-temperature zone 200 and enters the high-temperature zone 300, the material comes into contact with the second baffle plates 311. The second baffle plates 311 can prevent excessive material from entering the high-temperature zone 300, adjusting the amount of material entering the high-temperature zone 300. This adjustment helps maintain the stability of the material load in the high-temperature zone 300, avoiding a sudden drop in local temperature due to a sudden increase in material, thereby ensuring the stability and completeness of the final cobalt tetroxide formation reaction. (Refer to...) Figure 3 The axial spacing between the first four first baffle assemblies 210 within the low-temperature zone 200 can be set to d4 = (140-160) ± X cm. (Refer to...) Figure 1 The interval between the fourth first baffle assembly 210 and the second baffle assembly 310 here can be set to d5 = (260-280) ± X cm. This arrangement from dense to sparse is intended to allow the material to undergo a longer initial reaction in the early stage of the low temperature zone 200, and then be appropriately accelerated in the later stage to smoothly transition to the high temperature zone 300.

[0057] Preferred, refer to Figure 1 and Figure 10The high-temperature zone 300 is equipped with a third lifting assembly 320 and a fourth lifting assembly 330. The third lifting assembly 320 includes multiple third lifting plates 321. One side of the third lifting plate 321 is connected to the inner peripheral wall of the kiln body 100. The third lifting plate 321 extends along the axial direction of the kiln body 100. The multiple third lifting plates 321 are distributed at intervals along the circumference of the kiln body 100. The fourth lifting assembly 330 is located to the right of the third lifting assembly 320. The fourth lifting assembly 330 includes multiple fourth lifting plates 331. One side of the fourth lifting plate 331 is connected to the inner peripheral wall of the kiln body 100. The fourth lifting plate 331 extends along the axial direction of the kiln body 100. The multiple fourth lifting plates 331 are distributed at intervals along the circumference of the kiln body 100. The multiple third lifting plates 321 and the multiple fourth lifting plates 331 are arranged alternately. The third lifting assembly 320 is located to the right of the second baffle assembly 310. Material passes from left to right through the third lifting plate 321 and is then dispersed by the first lifting plate 221. The dispersed material is further dispersed by the fourth lifting plate 331, ensuring thorough dispersion. Within the high-temperature zone 300, the third and fourth lifting plates 321 maintain uniform material reaction and prevent overheating. Through continuous agitation, the third and fourth lifting plates 321 and 331 ensure brief and uniform contact time between material particles and the high-temperature kiln wall 100, preventing excessively high temperatures caused by prolonged contact with the wall, which could lead to abnormal grain growth or phase transformation. This ensures the uniformity of the final product's particle size and morphology. This setup helps increase the finished product qualification rate in the high-temperature zone 300 by nearly 10%. Meanwhile, since the high-temperature zone 300 mainly relies on the third lifting plate 321 and the fourth lifting plate 331 for mixing without the need for baffles to extend the residence time, the material throughput is relatively fast while ensuring quality, which helps to increase the sintering capacity by nearly 15% under the same kiln speed and tilt angle.

[0058] Reference Figure 9 Projected along the axial direction, the junction of the first lifting plate 221 and the inner peripheral wall of the kiln body 100 is the tangent point. The kiln body 100 is circular, and the tangent line passes through this tangent point. The angle between the tangent line and the first lifting plate 221 is θ. Furthermore, the second lifting plate 231, the third lifting plate 321, and the fourth lifting plate 331 are all the same as the first lifting plate 221, and the angles between them and their respective corresponding tangent lines are also θ. Preferably, θ = 60 degrees. Too small an angle may result in insufficient lifting capacity, with the material only sliding at the bottom; too large an angle may cause the material to be carried too high before falling, generating a large impact force on the particles, or causing the material to adhere to the lifting plate. An angle of about 60 degrees can provide sufficient lifting force while prompting the material to fall in a throwing manner, forming an ideal material curtain, which is beneficial for heat and mass transfer.

[0059] Preferred, refer to Figure 1The kiln body 100 is a first roller 130. The rotary kiln for preparing cobalt tetroxide also includes a first base 110, a second base 120, and a first drive component 140. The first base 110 is located to the left of the second base 120. The left end of the first roller 130 is inserted into the inner cavity of the first base 110 and rotatably connected to the first base 110. The right end of the first roller 130 is inserted into the inner cavity of the second base 120 and rotatably connected to the second base 120. The first drive component 140 is used to drive the first roller 130 to rotate around its own axis. The inner cavity of the first roller 130 has a low-temperature zone 200 and a high-temperature zone 300. The first drive component 140 includes a drive motor, a first synchronous pulley, a second synchronous pulley, and a synchronous belt. The drive end of the drive motor is fixedly connected to the first synchronous pulley. The second synchronous pulley is sleeved and fixedly connected to the first roller 130. The synchronous belt is sleeved on both the first and second synchronous pulleys. The drive motor can drive the first synchronous pulley, the second synchronous pulley, and the synchronous belt to rotate, thereby driving the first roller 130 to rotate around its own axis. The drive motor can be a variable frequency motor, and the rotational speed of the first roller 130 can be precisely controlled by adjusting the frequency. The rotational speed of the first roller 130 is one of the key parameters affecting the material residence time, and together with the tilt angle of the first roller 130, it determines the axial conveying speed of the material. By adjusting the rotational speed through the frequency converter, process parameters can be easily adjusted online according to the characteristics of different batches of materials or production needs.

[0060] It should be noted that, in this embodiment, the description of circumferential, axial or radial along the kiln body 100 corresponds to circumferential, axial or radial along the first roller 130.

[0061] Preferred, refer to Figure 2The feeding device 400 includes a storage bin 410, a weighing pipe 420, and a first discharge pipe 430. The discharge end of the storage bin 410 is connected to the upper end of the weighing pipe 420, and the lower end of the weighing pipe 420 is connected to the left end of the first discharge pipe 430. The right end of the first discharge pipe 430 passes through the first base 110 and is inserted into the inner cavity of the first roller 130 and communicates with the low-temperature zone 200. The first discharge pipe 430 is inclined downward from left to right. Under the action of gravity, the material in the first discharge pipe 430 can enter the low-temperature zone 200 of the kiln body 100 along the inclined direction of the first discharge pipe 430. The weighing pipe 420 is equipped with a first valve 461 and a second valve 462. The first valve 461 is located above the second valve 462, forming a weighing zone 440 between them. The weighing pipe 420 is equipped with a weighing sensor 450, which is used to weigh the material located in the weighing zone 440. During weighing, the second valve 462 is closed and the first valve 461 is open. The material in the storage bin 410 enters the weighing zone 440 through the first valve 461. When the weighing sensor 450 detects that the material in the weighing zone 440 has reached a specified weight, it closes the first valve 461 and opens the second valve 462, allowing the material in the weighing zone 440 to enter the first discharge pipe 430 and then the low-temperature zone 200. This design, combining a dual valve with a weighing sensor 450, achieves accurate, quantitative, and batch-wise material supply. Specifically, the first valve 461 and the second valve 462 can be pneumatic butterfly valves. By setting a weight threshold, such as 5-50 kg, when the weighing sensor 450 detects that the weight of the material in the weighing area 440 reaches or exceeds this value, the control system will send an interlock signal, automatically closing the upper first valve 461 and opening the lower second valve 462, completing one batch of material feeding. This weight-interlocked feeding method, compared with traditional timed or volumetric feeding, greatly increases the accuracy and stability of the feed rate, laying the foundation for the stability of the subsequent reaction within the kiln body 100.

[0062] Preferably, a third valve 463 is provided between the lower end of the feeding pipe 420 and the upper end of the first feeding pipe 430. The third valve 463 can be a rotary valve, and its rotation speed can be adjusted by a frequency converter, for example, between 5-30Hz. The rotary valve can feed material into the first feeding pipe 430 at a continuous and uniform rate, thereby avoiding the material from entering the kiln body 100 in an impact manner. By controlling the rotation speed of the rotary valve, the feeding rate can be finely adjusted, further smoothing the feeding flow and ensuring the stability and uniformity of the material layer thickness inside the kiln body 100.

[0063] Preferred, refer to Figure 1The dust removal device 500 includes a bag filter 510, an induced draft fan 520, and an exhaust pipe 530. The inlet end of the bag filter 510 is connected to one end of the exhaust pipe 530, and the other end of the exhaust pipe 530 is connected to the inner cavity of the first base 110. The outlet end of the bag filter 510 is connected to the suction end of the induced draft fan 520. The second base 120 is provided with a first inlet 150. External gas enters the inner cavity of the second base 120 through the first inlet 150 and then enters the inner cavity of the first drum 130. After the induced draft fan 520 starts, the gas and dust in the first drum 130 enter the inner cavity of the first base 110 and then enter the bag filter 510 through the exhaust pipe 530. After the bag filter 510 filters the dust, the dust is trapped inside the bag filter 510, and the gas is discharged through the induced draft fan 520. The dust removal device 500 creates a slightly negative pressure environment inside the kiln body 100. This effectively prevents dust and waste gases such as carbon dioxide generated during the reaction from leaking out from the seals at the kiln head and tail, thus improving the working environment. At the same time, it helps guide the fine powder particles generated during the reaction process to the bag filter 510 for effective collection. This reduces the content of substandard fine powder in the final product, improves product quality, and also allows for material recovery, reducing material loss.

[0064] Preferred, refer to Figure 11The cooling device 600 includes a third base 610, a fourth base 620, a second roller 630, a second drive component 640, a second discharge pipe 650, a cooling sleeve 660, and a circulating water tank 670. The third base 610 is located to the left of the fourth base 620. The left end of the second roller 630 is inserted into the inner cavity of the third base 610 and rotatably connected to it. The right end of the second roller 630 is inserted into the inner cavity of the fourth base 620 and rotatably connected to it. The second drive component 640 is used to drive the second roller 630 to rotate... The second roller 630 rotates on its own axis. The inlet end of the second feeding pipe 650 connects to the inner cavity of the second base 120, and the outlet end of the second feeding pipe 650 inserts into the third base 610 and connects to the inner cavity of the second roller 630. The second roller 630 is rotatably connected to the cooling sleeve 660. The outlet pipe of the circulating water tank 670 is connected to the cooling sleeve 660, which is a water-cooled jacket. The circulating return pipe of the circulating water tank 670 is connected to the cooling sleeve 660, and the water in the cooling sleeve 660 exchanges heat with the outer peripheral wall of the second roller 630. The second drive component 640 has the same structure as the first drive component 140, and will not be described further. The second drive component 640 drives the second roller 630 to rotate around its own axis via a synchronous belt. The cobalt tetroxide material exiting the high-temperature zone 300 is very hot. If it is directly exposed to air for natural cooling, the product performance may be affected due to uneven cooling rates or reactions with certain components in the air. Indirect cooling via a separate, water-cooled jacketed second roller 630 allows for control of the cooling process, ensuring the material temperature gradually decreases to the required level, preventing secondary cracking caused by thermal stress, and preparing the material for the next process.

[0065] Preferably, the four rotatable connections—the first roller 130 and the first base 110, the first roller 130 and the second base 120, the second roller 630 and the third base 610, and the second roller 630 and the fourth base 620—all employ a combined sealing structure. Specifically, stationary ring sealing flanges are fixedly connected to the first base 110, the second base 120, the third base 610, and the fourth base 620; rotating ring friction rings are fixedly connected to both ends of the first roller 130; and rotating ring friction rings are fixedly connected to both ends of the second roller 630. A high-temperature resistant, self-lubricating flexible seal, such as a graphite block or carbon fiber packing, is provided between the stationary ring sealing flange and the rotating ring friction ring. A pre-tightening device, such as a spring or cylinder, ensures that the flexible seal is tightly fitted onto the surface of the rotating ring friction ring, forming a reliable contact seal.

[0066] Preferred, refer to Figure 1The fourth base 620 is equipped with a second air inlet 680. The rotary kiln for preparing cobalt tetroxide also includes an exhaust fan 690, the outlet of which is connected to the first air inlet 150 and the second air inlet 680. The exhaust fan 690 can supply air to the inner cavities of the first drum 130 and the second drum 630 through the first air inlet 150 and the second air inlet 680, respectively. This provides the oxygen required for the oxidation of cobalt carbonate to cobalt tetroxide. The exhaust fan 690 can provide a stable and controllable airflow to ensure a stable reaction atmosphere.

[0067] Preferably, the exhaust port of the exhaust fan 690 is equipped with a filter 691. The filter 691 is used to filter the gas and can effectively remove dust, oil and other impurities from the air, preventing external impurities from contaminating the material.

[0068] The workflow of this utility model includes:

[0069] First, the pretreated, dried cobalt carbonate material is stored in the storage silo 410. At the start of operation, the upper first valve 461 opens, and the material falls into the weighing area 440. When the weighing sensor 450 detects that the material weight reaches a preset value (e.g., 5-50 kg), the control system closes the first valve 461 and opens the lower second valve 462, completing a precise batch weighing. After passing through the second valve 462, the material enters the third valve 463, which serves as a buffer and flow stabilizer. The third valve 463 is a rotary valve that rotates at a set frequency (e.g., 5-30 Hz) at a uniform speed, continuously and evenly feeding the material into the first feed pipe 430. The outlet end of the first feed pipe 430 passes through the fixed first base 110 and extends into the left end cavity of the rotating first roller 130.

[0070] The material smoothly enters the low-temperature zone 200 of the first drum 130. After entering the low-temperature zone 200, the material begins to move slowly to the right as the first drum 130 rotates and tilts. During this process, the material first encounters multiple first baffle components 210 arranged at intervals along the axial direction, which impedes its movement speed and effectively prolongs its residence time. At the same time, the staggered first lifting components 220 and second lifting components 230 continuously lift and tumble the material, forming a uniform material curtain, allowing the material to fully contact the hot airflow, remove free water and crystal water, and complete the pre-decomposition.

[0071] After being fully pre-decomposed, the material flows through the end of the low-temperature zone 200 and then smoothly enters the high-temperature zone 300 through the second baffle assembly 310 located at the inlet of the high-temperature zone 300, where its flow rate is regulated. At a higher temperature, the material undergoes a full oxidation reaction with sufficient air supplied by the exhaust fan 690 through the first air inlet 150 under the continuous and efficient agitation of the third lifting assembly 320 and the fourth lifting assembly 330, generating the target product cobalt tetroxide. Throughout the reaction process, the induced draft fan 520 maintains a slight negative pressure inside the kiln, promptly extracting reaction waste gas and dust to the dust removal device 500 for treatment. The high-temperature cobalt tetroxide material, after the reaction is complete, moves along the inclined direction of the first roller 130 to its right end and then is discharged from the outlet, falling into the fixed second base 120. The second base 120 serves as a transition chamber for collection and guidance, and its lower part is connected to the second discharge pipe 650. High-temperature material is fed into the left end cavity of the rotating second roller 630 through the second feeding pipe 650, which passes through the fixed third base 610.

[0072] After the material enters the second roller 630, it moves to the right as the second roller 630 rotates. The outside of the second roller 630 is wrapped by a cooling sleeve 660. Cooling water provided by the circulating water tank 670 continuously circulates within the sleeve, indirectly and uniformly cooling the material inside through the cylinder wall of the second roller 630, preventing thermal stress cracking caused by sudden cooling. The fully cooled cobalt tetroxide product moves to the right end of the second roller 630 and is discharged from its outlet, falling into the fixed fourth base 620. The fourth base 620 serves as the final finished product collection bin, and its bottom is equipped with a discharge port. Preferably, this discharge port is connected to a star-shaped discharge valve or a pneumatic gate valve to discharge the cooled finished product quantitatively and in a sealed manner for subsequent packaging or storage processes.

[0073] Through the synergistic effect of the above components, this device achieves precise control over the feed rate, residence time in the low-temperature zone (200°C), and material distribution within the furnace, significantly improving the reaction conditions of the material within the furnace. This greatly reduces product cracking, increases the overall product qualification rate by nearly 60%, and balances production capacity and ease of operation.

[0074] In this specification, the reference to the term "some embodiments" means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0075] Although embodiments of the present invention have been shown and described, those skilled in the art will understand 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 claims and their equivalents.

Claims

1. A rotary kiln for preparing cobalt tetroxide, characterized in that, include: A kiln body (100) has an inner cavity comprising a low-temperature zone (200) and a high-temperature zone (300). The right end of the low-temperature zone (200) is connected to the left end of the high-temperature zone (300). The kiln body (100) can be driven to rotate around its own axis. The low-temperature zone (200) is provided with a plurality of first baffle assemblies (210) and a first lifting assembly (220). The plurality of first baffle assemblies (210) are arranged at intervals along the axial direction of the kiln body (100). Each first baffle assembly (210) includes a plurality of first baffle plates (211), one side of which is connected to the kiln body. The inner peripheral wall of (100) is connected, the first baffle plate (211) extends radially along the kiln body (100), and the plurality of first baffle plates (211) of each first baffle assembly (210) are distributed circumferentially along the kiln body (100); the first lifting assembly (220) includes a plurality of first lifting plates (221), one side of the first lifting plate (221) is connected to the inner peripheral wall of the kiln body (100), the first lifting plate (221) extends axially along the kiln body (100), and the plurality of first lifting plates (221) are distributed circumferentially along the kiln body (100); The feeding device (400) has its discharge end connected to the left end of the low-temperature zone (200); A dust removal device (500) is provided, the exhaust end of which is connected to the inner cavity of the kiln body (100). The dust removal device (500) is used to extract dust from the inner cavity of the kiln body (100). A cooling device (600) is provided, the feed end of which is connected to the right end of the high-temperature zone (300), and the cooling device (600) is used to cool the material.

2. The rotary kiln for preparing cobalt tetroxide according to claim 1, characterized in that, The low-temperature zone (200) is provided with a second lifting assembly (230), which is located to the right of the first lifting assembly (220). The second lifting assembly (230) includes a plurality of second lifting plates (231). One side of the second lifting plate (231) is connected to the inner peripheral wall of the kiln body (100). The second lifting plate (231) extends axially along the kiln body (100). The plurality of second lifting plates (231) are distributed circumferentially along the kiln body (100). The plurality of first lifting plates (221) and the plurality of second lifting plates (231) are staggered.

3. The rotary kiln for preparing cobalt tetroxide according to claim 1, characterized in that, The high-temperature zone (300) is provided with a second baffle assembly (310) at its left end. The second baffle assembly (310) includes a plurality of second baffle plates (311). One side of the second baffle plate (311) is connected to the inner peripheral wall of the kiln body (100). The second baffle plate (311) extends radially along the kiln body (100), and the plurality of second baffle plates (311) are distributed circumferentially along the kiln body (100).

4. The rotary kiln for preparing cobalt tetroxide according to claim 3, characterized in that, The high-temperature zone (300) is equipped with a third lifting assembly (320) and a fourth lifting assembly (330). The third lifting assembly (320) includes multiple third lifting plates (321). One side of each third lifting plate (321) is connected to the inner circumferential wall of the kiln body (100). The third lifting plates (321) extend axially along the kiln body (100), and the multiple third lifting plates (321) are distributed circumferentially around the kiln body (100). The fourth lifting assembly (330) is located... On the right side of the third lifting assembly (320), the fourth lifting assembly (330) includes a plurality of fourth lifting plates (331). One side of the fourth lifting plate (331) is connected to the inner peripheral wall of the kiln body (100). The fourth lifting plate (331) extends axially along the kiln body (100). The plurality of fourth lifting plates (331) are distributed circumferentially along the kiln body (100). The plurality of third lifting plates (321) and the plurality of fourth lifting plates (331) are staggered.

5. The rotary kiln for preparing cobalt tetroxide according to claim 1, characterized in that, The kiln body (100) is a first roller (130). The rotary kiln for preparing cobalt tetroxide also includes a first base (110), a second base (120), and a first driving component (140). The first base (110) is located to the left of the second base (120). The left end of the first roller (130) is inserted into the inner cavity of the first base (110) and rotatably connected to the first base (110). The right end of the first roller (130) is inserted into the inner cavity of the second base (120) and rotatably connected to the second base (120). The inner cavity of the first roller (130) is connected to the inner cavities of the first base (110) and the second base (120) respectively. The first driving component (140) is used to drive the first roller (130) to rotate around its own axis.

6. The rotary kiln for preparing cobalt tetroxide according to claim 5, characterized in that, The feeding device (400) includes a storage bin (410), a weighing pipe (420), and a first discharge pipe (430). The discharge end of the storage bin (410) is connected to the upper end of the weighing pipe (420), and the lower end of the weighing pipe (420) is connected to the left end of the first discharge pipe (430). The right end of the first discharge pipe (430) passes through the first base (110) and is inserted into the inner cavity of the first roller (130) and communicates with the low-temperature zone (200). The weighing pipe (430) slopes downward from left to right. The weighing pipe (420) is equipped with a first valve (461) and a second valve (462). The first valve (461) is located above the second valve (462). A weighing area (440) is formed between the first valve (461) and the second valve (462). The weighing pipe (420) is equipped with a weighing sensor (450), which is used to weigh the material located in the weighing area (440).

7. The rotary kiln for preparing cobalt tetroxide according to claim 6, characterized in that, A third valve (463) is provided between the lower end of the weighing pipe (420) and the upper end of the first feeding pipe (430).

8. The rotary kiln for preparing cobalt tetroxide according to claim 5, characterized in that, The dust removal device (500) includes a bag filter (510), an induced draft fan (520), and an exhaust pipe (530). The inlet end of the bag filter (510) is connected to one end of the exhaust pipe (530), and the other end of the exhaust pipe (530) is connected to the inner cavity of the first base (110). The outlet end of the bag filter (510) is connected to the exhaust end of the induced draft fan (520). The second base (120) is provided with a first air inlet (150).

9. The rotary kiln for preparing cobalt tetroxide according to claim 8, characterized in that, The cooling device (600) includes a third base (610), a fourth base (620), a second roller (630), a second drive component (640), a second discharge pipe (650), a cooling sleeve (660), and a circulating water tank (670). The third base (610) is located to the left of the fourth base (620). The left end of the second roller (630) is inserted into the inner cavity of the third base (610) and rotatably connected to the third base (610). The right end of the second roller (630) is inserted into the inner cavity of the fourth base (620) and rotatably connected to the fourth base (620). The second drive component (640) is used to drive the second roller (610). Two rollers (630) rotate around their own axis. The feed end of the second feed pipe (650) is connected to the inner cavity of the second base (120). The discharge end of the second feed pipe (650) is inserted into the third base (610) and connected to the inner cavity of the second roller (630). The second roller (630) is inserted through and rotatably connected to the cooling sleeve (660). The outlet pipe of the circulating water tank (670) is connected to the cooling sleeve (660). The circulating return pipe of the circulating water tank (670) is connected to the cooling sleeve (660). The water in the cooling sleeve (660) exchanges heat with the outer peripheral wall of the second roller (630).

10. The rotary kiln for preparing cobalt tetroxide according to claim 9, characterized in that, The fourth base (620) is provided with a second air inlet (680), and the rotary kiln for preparing cobalt tetroxide also includes an exhaust fan (690), the air outlet of which is connected to the first air inlet (150) and the second air inlet (680) respectively.

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