A lithium carbonate packaging and transportation system

Abstract

The utility model discloses a kind of packing and transporting systems of lithium carbonate, sequentially including drying device, airflow mill, airflow mill buffer bin, airflow mill finished product bin and packaging device according to material flow direction, drying device and airflow mill are connected by first pipeline, airflow mill and airflow mill buffer bin are connected by second pipeline, airflow mill buffer bin and airflow mill finished product bin are connected by third pipeline, airflow mill finished product bin and packaging device are connected by fourth pipeline, airflow mill buffer bin and first pipeline are equipped with fifth pipeline, negative pressure generating device is equipped on fifth pipeline, the inlet end of negative pressure generating device is connected with airflow mill buffer bin, the outlet end of negative pressure generating device is connected with first pipeline.The packing and transporting system of lithium carbonate of the utility model can reduce the caking and hardening phenomenon of material during transportation, with the advantages of simple device, easy operation, low use cost and the like.

Description

Technical Field

[0001] This utility model belongs to the field of battery materials, and in particular relates to a packaging system for lithium carbonate. Background Technology

[0002] With the development of energy storage technology, lithium-ion batteries are widely used in 3C digital products, new energy electric vehicles and power tools due to their high energy density, long cycle life, good safety performance, low self-discharge rate, fast charging and low operating temperature. The market for downstream battery-grade lithium carbonate applications is expanding rapidly.

[0003] Currently, the main methods for preparing battery-grade lithium carbonate include purification from salt lake brine, purification from lithium ore, and purification from spent lithium batteries. The lithium carbonate produced by these methods is in powder form. During packaging and transportation, due to variations in moisture content and environmental conditions, it may absorb water, clump, and cake, affecting the quality of the product upon delivery to the customer. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the deficiencies and defects mentioned in the background art above and provide a packaging and transportation system for lithium carbonate. This system can reduce the moisture in the finished lithium carbonate and prevent it from absorbing water, clumping and hardening during packaging and transportation.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is as follows: A lithium carbonate packaging and transportation system includes, in sequence according to the material flow direction, a drying device, an air jet mill, an air jet mill buffer chamber, an air jet mill finished product chamber, and a packaging device. The drying device and the air jet mill are connected by a first pipe, the air jet mill and the air jet mill buffer chamber are connected by a second pipe, the air jet mill buffer chamber and the air jet mill finished product chamber are connected by a third pipe, the air jet mill finished product chamber and the packaging device are connected by a fourth pipe, and a fifth pipe is provided between the air jet mill buffer chamber and the first pipe. A negative pressure generating device is provided on the fifth pipe. The inlet end of the negative pressure generating device is connected to the air jet mill buffer chamber, and the outlet end of the negative pressure generating device is connected to the first pipe.

[0006] In the aforementioned lithium carbonate packaging and transportation system, preferably, the first pipeline is equipped with a finished product conveying valve, and the outlet end of the negative pressure generating device is located at the finished product conveying valve.

[0007] In the aforementioned lithium carbonate packaging and transportation system, preferably, a compressed air replacement port is provided on the fifth pipe between the outlet end of the negative pressure generating device and the first pipe. The compressed air replacement port can determine whether to replace the air in the pipe based on the temperature and humidity inside the airflow mill buffer chamber, ensuring the dryness of the circulating air.

[0008] In the aforementioned lithium carbonate packaging and transportation system, preferably, a cooling device, which is a heat exchanger, is provided on the fifth pipe between the outlet end of the negative pressure generating device and the first pipe. When the variable frequency induced draft fan is working, the air in the system gradually heats up. By installing a cooling device on the pipe between the outlet end of the variable frequency induced draft fan and the finished product conveying valve, the circulating air at the outlet of the variable frequency induced draft fan can be cooled to prevent the finished product temperature from rising.

[0009] In the aforementioned lithium carbonate packaging and transportation system, preferably, a first filter is provided between the negative pressure generating device and the cooling device. The first filter can block dust; even if a small amount of dust passes through the filter bag, it can still be blocked.

[0010] In the aforementioned lithium carbonate packaging and transportation system, preferably, a second filter is also provided at the outlet of the cooling device. The second filter can further block dust, and a small amount of metal particles generated by friction between dust and the heat exchanger can also be blocked by the second filter, preventing metal particles from affecting product quality.

[0011] In the aforementioned lithium carbonate packaging and transportation system, preferably, the air jet mill buffer chamber is equipped with a filter bag to prevent dust in the air jet mill buffer chamber from being sucked away by the negative pressure generating device.

[0012] In the aforementioned lithium carbonate packaging and transportation system, preferably, the negative pressure generating device is a variable frequency induced draft fan, which serves as the power device for system air circulation.

[0013] In the aforementioned lithium carbonate packaging and transportation system, preferably, the air jet mill buffer chamber is equipped with a temperature monitor and a humidity monitor. These monitors allow for convenient real-time monitoring of temperature and humidity; once the temperature or humidity reaches its upper limit, compressed air is used to purify the system.

[0014] In the aforementioned lithium carbonate packaging and transportation system, preferably, the air jet mill finished product silo is located below the air jet mill buffer silo, and the packaging device is located below the air jet mill finished product silo. This arrangement facilitates the transport and transfer of materials using gravity. Valves can be installed on the third and fourth pipes.

[0015] This utility model discloses a lithium carbonate packaging and transportation system that reduces the humidity of the finished lithium carbonate product and prevents clumping during transportation and packaging. The material flow is roughly as follows: the finished product from the electric kiln (i.e., drying device) outlet is conveyed to the air jet mill for air jet pulverization, and then conveyed to the air jet mill buffer chamber by the negative pressure of the induced draft fan. The air in the system is drawn by the induced draft fan through a filter bag to the induced draft fan outlet, passes through a heat exchanger and filter, and is then conveyed to the finished product conveying valve. The finished product conveying valve is connected to the air jet mill to achieve circulation. After the temperature and humidity in the air jet mill buffer chamber reach the monitoring upper limit, compressed air is used to replace the air in the system. The material in the air jet mill buffer chamber is conveyed by gravity to the air jet mill finished product chamber and the packaging machine (i.e., packaging device).

[0016] This utility model discloses a lithium carbonate packaging and transportation system with compressed air pressure ≤0.6MPa and pressure dew point ≥-30℃. Temperature and humidity monitors ensure air temperature ≤50℃ and humidity ≤40%. Air at the exhaust fan outlet is cooled to within 45℃ by a cooling device. The relative humidity of the compressed air used for displacement is ≤5% (at 35℃) to maintain stable system humidity, ensuring the finished product does not absorb moisture within the system, thus achieving optimal displacement effect and system humidity balance.

[0017] This utility model discloses a lithium carbonate packaging and transportation system that isolates the entire finished product conveying system from the outside humid air. A negative pressure is generated by an induced draft fan and then circulated at the front end, forming a closed system. This reduces the introduction of humid air from the electric kiln outlet to the packaging machine. Furthermore, the system's temperature and humidity are monitored regularly; if they exceed the limits, the system is replaced with compliant compressed air to further reduce the introduction of moisture into the finished product. These measures, working together, can reduce the caking and compaction of materials during transportation.

[0018] The lithium carbonate packaging and transportation system of this utility model uses PTFE-lined pipes for all conveying pipelines.

[0019] Compared with the prior art, the advantages of this utility model are: This utility model discloses a lithium carbonate packaging and transportation system. A negative pressure generator constructs a negative pressure system to transport the finished material from a drying unit to an air jet mill, and then to the mill's buffer chamber. This isolates the finished material from external humid air, forming a closed-loop conveying system. This prevents the introduction of external moisture and maintains the temperature and humidity within the system within a specific range, thereby reducing the moisture content of the finished material and minimizing caking and compaction during transportation. This lithium carbonate packaging and transportation system offers advantages such as simple design, easy operation, and low operating costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the packaging and transportation system for lithium carbonate according to this utility model.

[0022] Legend 1. Drying device; 2. Air jet mill; 3. Air jet mill buffer chamber; 31. Filter bag; 32. Temperature monitor; 33. Humidity monitor; 4. Air jet mill finished product chamber; 5. Packaging device; 6. Negative pressure generating device; 7. Finished product conveying valve; 8. Compressed air replacement port; 9. Cooling device; 10. First filter; 11. Second filter; 101. First pipeline; 102. Second pipeline; 103. Third pipeline; 104. Fourth pipeline; 105. Fifth pipeline. Detailed Implementation

[0023] To facilitate understanding of this utility model, it will be described more comprehensively and in detail below with reference to the accompanying drawings and preferred embodiments. However, the scope of protection of this utility model is not limited to the following specific embodiments.

[0024] It should be noted that when a component is described as being "fixed to, attached to, connected to or connected to" another component, it can be directly fixed to, attached to, connected to or connected to the other component, or it can be indirectly fixed to, attached to, connected to or connected to the other component through other intermediate connectors.

[0025] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of protection of this invention.

[0026] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0027] Example: like Figure 1As shown, the lithium carbonate packaging and transportation system of this embodiment includes, in sequence according to the material flow direction, a drying device 1 (electric kiln in this embodiment), an air jet mill 2, an air jet mill buffer chamber 3, an air jet mill finished product chamber 4, and a packaging device 5 (packaging machine in this embodiment). The drying device 1 and the air jet mill 2 are connected by a first pipe 101, the air jet mill 2 and the air jet mill buffer chamber 3 are connected by a second pipe 102, the air jet mill buffer chamber 3 and the air jet mill finished product chamber 4 are connected by a third pipe 103, the air jet mill finished product chamber 4 and the packaging device 5 are connected by a fourth pipe 104, a fifth pipe 105 is provided between the air jet mill buffer chamber 3 and the first pipe 101, and a negative pressure generating device 6 (variable frequency induced draft fan in this embodiment) is provided on the fifth pipe 105. The inlet end of the negative pressure generating device 6 is connected to the air jet mill buffer chamber 3, the outlet end of the negative pressure generating device 6 is connected to the first pipe 101, and a finished product conveying valve 7 is provided on the first pipe 101. The outlet end of the negative pressure generating device 6 is located at the finished product conveying valve 7.

[0028] In this embodiment, the air mill buffer chamber 3 is equipped with a temperature monitor 32 and a humidity monitor 33, and the fifth pipe 105 between the outlet end of the negative pressure generating device 6 and the first pipe 101 is equipped with a compressed air replacement port 8.

[0029] In this embodiment, a cooling device 9 is provided on the fifth pipe 105 between the outlet end of the negative pressure generating device 6 and the first pipe 101. The cooling device 9 is a heat exchanger.

[0030] In this embodiment, a first filter 10 is provided between the negative pressure generating device 6 and the cooling device 9. A second filter 11 is also provided at the outlet of the cooling device 9.

[0031] In this embodiment, the airflow mill buffer chamber 3 is provided with a filter bag 31 to prevent the dust in the airflow mill buffer chamber 3 from being sucked away by the negative pressure generating device 6.

[0032] In this embodiment, the air jet mill finished product hopper 4 is located below the air jet mill buffer hopper 3, and the packaging device 5 is located below the air jet mill finished product hopper 4.

[0033] In this embodiment, the lithium carbonate packaging and transportation system includes a variable frequency induced draft fan between the electric kiln outlet and the air jet mill buffer chamber 3. This fan utilizes negative pressure to transport the product ground by the air jet mill 2 to the air jet mill buffer chamber 3, while simultaneously circulating the air from the air jet mill buffer chamber 3 back to the first pipe 101 at the electric kiln outlet. The finished material in the air jet mill buffer chamber 3 is transported by gravity to the air jet mill finished product chamber 4 and the packaging device 5. The entire process is isolated from the outside environment, preventing the introduction of external moisture and reducing product humidity. Testing shows that the system humidity can be controlled below 50%, and the finished product moisture content is 1.3 ± 0.1‰. In a more preferred embodiment, this embodiment further includes a temperature monitor 32 and a humidity monitor 33 in the air jet mill buffer chamber 3. A compressed air replacement port 8 is located on the fifth pipe 105 between the outlet of the negative pressure generator 6 and the first pipe 101. The temperature monitor 32 and humidity monitor 33 monitor the temperature and humidity in the air jet mill buffer chamber 3 in real time. When the temperature of the air jet mill buffer chamber 3 is >50°C and the relative humidity is >45%, compressed air replacement is activated, replacing the air with dry air through the compressed air replacement port 8. Tests have shown that this improved solution can control the system humidity to below 50% and the finished product moisture content to 0.6±0.1‰, which can greatly reduce the caking and slagging of lithium carbonate materials during transportation.

Claims

1. A packaging and transportation system for lithium carbonate, characterized in that, The components, arranged in the order of material flow, include a drying device (1), an air jet mill (2), an air jet mill buffer chamber (3), an air jet mill finished product chamber (4), and a packaging device (5). The drying device (1) and the air jet mill (2) are connected by a first pipe (101). The air jet mill (2) and the air jet mill buffer chamber (3) are connected by a second pipe (102). The air jet mill buffer chamber (3) and the air jet mill finished product chamber (4) are connected by a third pipe (103). The air jet mill finished product chamber (4) and the packaging device (5) are connected by a fourth pipe (104). A fifth pipe (105) is provided between the air jet mill buffer chamber (3) and the first pipe (101). A negative pressure generating device (6) is provided on the fifth pipe (105). The inlet end of the negative pressure generating device (6) is connected to the air jet mill buffer chamber (3), and the outlet end of the negative pressure generating device (6) is connected to the first pipe (101).

2. The packaging and transportation system according to claim 1, characterized in that, The first pipeline (101) is equipped with a finished product conveying valve (7), and the outlet end of the negative pressure generating device (6) is located at the finished product conveying valve (7).

3. The packaging and transportation system according to claim 1, characterized in that, A compressed air replacement port (8) is provided on the fifth pipe (105) between the outlet end of the negative pressure generating device (6) and the first pipe (101).

4. The packaging and transportation system according to claim 1, characterized in that, A cooling device (9) is provided on the fifth pipe (105) between the outlet end of the negative pressure generating device (6) and the first pipe (101), and the cooling device (9) is a heat exchanger.

5. The packaging and transportation system according to claim 4, characterized in that, A first filter (10) is provided between the negative pressure generating device (6) and the cooling device (9).

6. The packaging and transportation system according to claim 4, characterized in that, A second filter (11) is also provided at the outlet of the cooling device (9).

7. The packaging and transportation system according to claim 1, characterized in that, The airflow mill buffer chamber (3) is provided with a filter bag (31) to prevent the dust in the airflow mill buffer chamber (3) from being sucked away by the negative pressure generating device (6).

8. The packaging and transportation system according to claim 1, characterized in that, The negative pressure generating device (6) is a variable frequency induced draft fan.

9. The packaging and transportation system according to claim 1, characterized in that, The airflow mill buffer chamber (3) is equipped with a temperature monitor (32) and a humidity monitor (33).

10. The packaging and transportation system according to claim 1, characterized in that, The air jet mill finished product silo (4) is located below the air jet mill buffer silo (3), and the packaging device (5) is located below the air jet mill finished product silo (4).

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