A lithium extraction, decomposition, stirring, and feeding device

Abstract

A lithium extraction and decomposition stirring and lifting device effectively solves the problems of high energy consumption, easy introduction of impurities, and inaccurate flow control in existing lifting equipment. It includes a lifting pipe and a stirring and lifting structure. The stirring and lifting structure includes a drive unit, a frame, a stirring shaft, a lifting impeller, and a frequency converter. The frame is fixedly installed on the top of the decomposition tank and spans a grid beam fixed above the outlet of the lifting pipe. A vertically downward stirring shaft is mounted on the rotating shaft of the drive unit. The lower end of the stirring shaft extends through a chute into the lifting pipe, which is connected to the chute. A lifting impeller is installed at the lower end of the stirring shaft inside the lifting pipe. The drive unit is electrically connected to the frequency converter via wires to adjust the speed of the drive unit, thereby precisely controlling the lifting flow rate of the lifting impeller. This invention has a simple, novel, and unique structure, is easy to install and use, and has good performance. It is an innovation in hydrometallurgical and chemical production equipment and has practical application value.

Description

Technical Field

[0001] This utility model relates to the technical field of hydrometallurgical and chemical production equipment, and in particular to a lithium extraction, decomposition, stirring, and feeding device. Background Technology

[0002] In the decomposition process of the alumina or lithium extraction industry, 10-20 decomposition tanks are typically operated in series. The slurry at the bottom of the decomposition tank needs to be lifted through a lifting pipe to a chute at the top of the tank before flowing into the next decomposition tank, thus achieving continuous material flow and reaction.

[0003] Currently, the gas-lifting method is widely used in the industry, and it mainly exists in the following two forms: 1. Traditional compressed air feeding: Compressed air at a pressure of 0.1-0.2 MPa is blown into a feeding tank immersed in the tank through a blower pipe. The pressure difference between the inside and outside of the feeding tank is used to pressurize the slurry to the next process. This method requires a dedicated air compressor and a complex blower piping system, resulting in high energy consumption and high equipment investment and maintenance costs.

[0004] 2. Carbon dioxide gas lifting: This method utilizes the CO2 gas generated by the decomposition reaction itself, which is then compressed and used for lifting. While this method reduces the consumption of compressed air, the introduced CO2 gas may lead to carbonation, increasing the impurity content in the product and affecting the chemical purity of the final product. This drawback is particularly prominent in the lithium extraction industry, where extremely high purity requirements are placed.

[0005] The two pneumatic lifting methods described above suffer from problems with the lifting equipment, resulting in insufficient control precision and an inability to accurately and flexibly adjust the conveying flow rate to adapt to different production conditions and product requirements. Furthermore, pneumatic lifting has inherent drawbacks such as high energy consumption, susceptibility to impurities, and system complexity. Therefore, improvements and innovations in lifting equipment are imperative. Utility Model Content

[0006] In view of the above situation and to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a lithium extraction, decomposition, stirring and feeding device, which can effectively solve the problems of high energy consumption, easy introduction of impurities and inaccurate flow control of existing feeding equipment.

[0007] The technical solution provided by this utility model is a lithium extraction and decomposition stirring and lifting device, comprising a lifting pipe and a stirring and lifting structure. The stirring and lifting structure includes a drive device, a frame, a stirring shaft, a lifting impeller, and a frequency converter. The frame is fixedly installed on the top of the decomposition tank and spans a grid beam fixed above the outlet of the lifting pipe. A vertically downward stirring shaft is mounted on the rotating shaft of the drive device. The lower end of the stirring shaft extends through a chute into the lifting pipe, which is connected to the chute. A lifting impeller is mounted inside the lifting pipe at the lower end of the stirring shaft. The drive device is electrically connected to the frequency converter via a wire to adjust the rotation speed of the drive device, thereby precisely controlling the lifting flow rate of the lifting impeller.

[0008] This utility model has a simple, novel, and unique structure, is easy to install and use, and has good effects. It can effectively solve the problems of high energy consumption, easy introduction of impurities, and inaccurate flow control of existing material feeding equipment. It is an innovation in hydrometallurgical and chemical production equipment and has practical application value. Attached Figure Description

[0009] Figure 1 This is a front view of the structure of this utility model; Figure 2 This is a schematic diagram of the lithium extraction, decomposition, stirring and feeding device of this utility model installed on the decomposition tank (see A). The components include: 1. Decomposition tank; 2. Decomposition tank agitator; 3. Feeding pipe; 4. Grid beam; 5. Frame; 6. Permanent magnet synchronous motor; 7. Agitator shaft; 8. Feeding impeller; 9. Feed chute; 10. Frequency converter; 11. Reducer; 12. Coupling. Detailed Implementation

[0010] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings and specific circumstances.

[0011] Depend on Figure 1-2 As shown, the technical solution provided by this utility model is a lithium extraction and decomposition stirring and lifting device, comprising a lifting pipe 3 and a stirring and lifting structure. The stirring and lifting structure includes a drive device 6, a frame 5, a stirring shaft 7, a lifting impeller 8, and a frequency converter 10. The frame 5 is fixedly installed on the top of the decomposition tank 1 and spans the grid beam 4 fixed above the outlet of the lifting pipe 3. The rotating shaft of the drive device 6 is equipped with a vertically downward stirring shaft 7. The lower end of the stirring shaft 7 extends through a material chute 9 into the lifting pipe 3, which is connected to the material chute 9. The lower end of the stirring shaft 7 is equipped with a lifting impeller 8 inside the lifting pipe 3. The drive device 6 is electrically connected to the frequency converter 10 via a wire to adjust the rotation speed of the drive device 6, thereby precisely controlling the lifting flow rate of the lifting impeller.

[0012] To ensure effectiveness and ease of use, the lower end of the material lifting pipe 3 is sloping 3-1, which facilitates the entry of materials into the pipe and improves the mixing effect.

[0013] The drive device 6 is a permanent magnet synchronous motor.

[0014] The material lifting impeller 8 is an axial flow impeller.

[0015] A reducer 11 is provided between the drive device 6 and the stirring shaft 7. The input end and output end of the reducer 11 are connected to the rotating shaft (motor shaft) of the permanent magnet synchronous motor and the stirring shaft 7 respectively via a coupling 12 to meet different torque and speed requirements.

[0016] The stirring and lifting structure also includes a protective bearing or stabilizer, installed on the inner wall of the lifting pipe, to assist in supporting the stirring shaft and prevent it from shaking excessively during long-term operation (not shown in the figure).

[0017] When using this utility model, such as Figure 2 As shown, the frame 5 is stably placed on top of the decomposition tank 1 and fixed to the grid beam 4 above the outlet of the lifting pipe 3. The permanent magnet synchronous motor 6 is installed and fixed on the frame 5. The stirring shaft 7, connected to the upward-lifting axial flow impeller (lifting impeller 8), is slowly lowered from the top opening of the lifting pipe 3, ensuring that the impeller reaches an appropriate depth inside the lifting pipe 3. The upper end of the stirring shaft 7 is connected to the output shaft of the permanent magnet synchronous motor 6 via a coupling. Finally, the frequency converter 10 is installed in the nearby electrical control room and connected to the permanent magnet synchronous motor 6 via a cable.

[0018] During operation, the device is started, and the frequency converter controls the permanent magnet synchronous motor 6 to rotate at the set speed, driving the stirring shaft 7 and the lifting impeller 8 to rotate together. The rotating lifting impeller 8 continuously pumps the slurry at the bottom of the lifting pipe 3 upwards until it is discharged from the top outlet, enters the material chute 9, and finally flows into the next stage decomposition tank. The operator can easily adjust the motor speed by setting different frequencies on the frequency converter according to production needs, thereby achieving precise control of the slurry delivery volume.

[0019] Compared with the prior art, this utility model has the following beneficial technical effects: 1. Energy saving and consumption reduction: The system adopts a high-efficiency permanent magnet synchronous motor for direct drive, which has a much higher energy conversion efficiency than the traditional compressed air system. It eliminates large power equipment such as air compressors, significantly reducing power consumption and production costs.

[0020] 2. Ensure product purity: Completely eliminates the gas feeding method, avoiding impurities (such as oil, other gas components) and side reactions (carbonation) that may be introduced by compressed air or CO2 gas. It is especially suitable for the decomposition process of lithium carbonate or lithium hydroxide, which have extremely high requirements for product chemical purity.

[0021] 3. Precise and controllable flow rate: The speed of the permanent magnet motor can be infinitely adjusted by the frequency converter, which can directly and linearly control the pumping capacity of the material conveying impeller, so as to achieve precise, flexible and stable control of the material conveying flow rate, which facilitates the optimization of decomposition process conditions and improves the consistency of product quality.

[0022] 4. Simplified structure and convenient maintenance: It eliminates the need for complex compressed gas pipelines, valves and gas storage systems, resulting in a compact equipment structure, fewer failure points, more reliable operation, and a significant reduction in daily maintenance workload and costs.

[0023] 5. Good adaptability: This device can be used as a modification solution for traditional air-lift systems, especially for the lifting pipes of φ900mm and above in large decomposition tanks such as φ16x42m. It is easy to modify and has strong applicability.

[0024] It should also be noted that the above are only preferred embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope of the technology disclosed in the present utility model, based on the technical solution and inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A lithium extraction and decomposition stirring and lifting device, comprising a lifting pipe (3) and a stirring and lifting structure, characterized in that, The stirring and lifting structure includes a drive device (6), a frame (5), a stirring shaft (7), a lifting impeller (8), and a frequency converter (10). The frame (5) is fixedly installed on the top of the decomposition tank (1) and spans the grid beam (4) fixed above the outlet of the lifting pipe (3). The rotating shaft of the drive device (6) is equipped with a vertically downward stirring shaft (7). The lower end of the stirring shaft (7) extends through the material chute (9) into the lifting pipe (3) which is connected to the material chute (9). The lower end of the stirring shaft (7) is equipped with a lifting impeller (8) in the lifting pipe (3). The drive device (6) is electrically connected to the frequency converter (10) via a wire to adjust the rotation speed of the drive device (6) and thus precisely control the lifting flow rate of the lifting impeller.

2. The lithium extraction, decomposition, stirring, and feeding device according to claim 1, characterized in that, The lower end of the material lifting pipe (3) is inclined (3-1) to facilitate the entry of materials into the pipe and improve the stirring effect.

3. The lithium extraction, decomposition, stirring, and feeding device according to claim 1, characterized in that, The drive device (6) is a permanent magnet synchronous motor.

4. The lithium extraction, decomposition, stirring, and feeding device according to claim 1, characterized in that, The material lifting impeller (8) is an axial flow impeller.

5. The lithium extraction, decomposition, stirring, and feeding device according to claim 1, characterized in that, A reducer (11) is provided between the drive device (6) and the stirring shaft (7). The input end and output end of the reducer (11) are connected to the rotating shaft of the permanent magnet synchronous motor and the stirring shaft (7) respectively via a coupling (12) to meet different torque and speed requirements.

6. The lithium extraction, decomposition, stirring, and feeding device according to claim 1, characterized in that, The aforementioned mixing and lifting structure also includes a protective bearing or stabilizer, installed on the inner wall of the lifting pipe, to assist in supporting the mixing shaft and prevent excessive shaking during long-term operation.

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