Battery-grade lithium carbonate purification system
By installing an outer sleeve on the outer sleeve of the fourth pipeline of the lithium carbonate purification system and transporting cooling medium, the problem of blockage caused by the incompletely pyrolyzed lithium hydroxide continues to heat the lithium carbonate particles in the pipeline, and the smooth and stable operation of the purification system is achieved.
Patent Information
- Application Number
- CN202421494440.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-26
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-06-26
AI Technical Summary
During the preparation of lithium carbonate, lithium hydroxide that has not been completely pyrolyzed continues to thermally decompose lithium carbonate during the pipeline transportation process, resulting in blockage of the pipeline.
A battery-grade lithium carbonate purification system is designed, including a pyrolysis tower, a thickener and a cooling mechanism. By placing an outer sleeve on the outside of the fourth pipeline and connecting the cooling mechanism to convey the cooling medium, it is ensured that the liquid temperature in the fourth pipeline does not reach the pyrolysis temperature, thereby preventing the incompletely reacted lithium bicarbonate from continuing to thermally decompose the lithium carbonate particles.
It effectively prevents the incompletely reacted lithium bicarbonate from thermally decomposing lithium carbonate particles in the pipeline, avoids pipeline blockage, and ensures smooth and stable operation of the purification system.
Smart Images
Figure CN222778043U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium carbonate purification, in particular to a battery-grade lithium carbonate purification system. Background Art
[0002] The main raw material of lithium batteries is battery-grade lithium carbonate. With the advancement of new energy technology, progress and breakthroughs have also begun to be made in the field of transportation. Among them, lithium-ion batteries are the core energy of new energy vehicles and have played a decisive role in the development of new energy vehicles. The use of battery-grade lithium carbonate to prepare lithium batteries has better quality and performance, can reduce interference from the outside world, and thus extend its service life and increase the actual endurance time, which plays a vital role in the development of the new energy vehicle field.
[0003] The preparation of lithium carbonate mainly uses industrial lithium hydroxide as raw material, which is dissolved in heated water to form a lithium hydroxide solution, and the lithium hydroxide solution is further heated to thermally decompose the lithium hydroxide into lithium carbonate particles. Finally, the solid-liquid mixture is transported to a designated thickening device through a pipeline for precipitation to achieve solid-liquid separation. Since the carbonization and pyrolysis processes are both continuous production in actual production, it is inevitable that the solid-liquid mixture transported by the pipeline still contains some unpyrolyzed lithium hydroxide. This part of the lithium hydroxide with incomplete pyrolysis reaction continues to thermally decompose lithium carbonate during the pipeline transportation process, causing pipeline blockage. Utility Model Content
[0004] In order to solve the technical problems existing in the background technology, the utility model proposes a battery-grade lithium carbonate purification system.
[0005] The utility model proposes a battery-grade lithium carbonate purification system, comprising: a pyrolysis tower, a thickener, and a cooling mechanism for conveying a cooling medium, wherein:
[0006] The pyrolysis tower comprises a main chamber and a central chamber arranged in the main chamber. The top of the pyrolysis tower is provided with a first pipeline connected to the main chamber for conveying a high-temperature medium into the main chamber and a second pipeline connected to the central chamber for conveying a lithium bicarbonate solution into the central chamber; the bottom of the pyrolysis tower is provided with a third pipeline connected to the main chamber for drawing out the high-temperature medium in the main chamber and a fourth pipeline connecting the central chamber and a thickener for conveying the lithium bicarbonate solution in the central chamber to the thickener;
[0007] The outer sleeve is provided on the outside of the fourth pipeline, and an inner support ring is provided between the inner part of the outer sleeve and the outer part of the fourth pipeline to connect the two so as to maintain a distance between the two, and a plurality of inner support rings are provided and are spaced apart along the conveying direction of the fourth pipeline;
[0008] The cooling mechanism is connected to the outer casing to transport low-temperature medium into the inner part of the outer casing.
[0009] Preferably, a fifth pipeline connected to the fourth pipeline for conveying flushing liquid into the fourth pipeline is provided between both ends of the fourth pipeline.
[0010] Preferably, the fifth pipeline has a plurality of outlet ends, each of which is arranged along the delivery pipe spacing of the fourth pipeline and is connected to the fourth pipeline, and a switch valve is provided between each outlet end and the fourth pipeline.
[0011] Preferably, the third pipeline is spirally wound outside the fifth pipeline.
[0012] Preferably, it also includes a heat-insulating layer that wraps the third pipeline and the fifth pipeline on the inner side thereof.
[0013] Preferably, the liquid inlet end of the fifth pipeline is connected to a thickener.
[0014] In the utility model, the first pipeline is used to transport high-temperature medium into the main chamber of the pyrolysis tower, so that the interior of the pyrolysis tower is in a high-temperature environment, and the third pipeline cooperates with the first pipeline to complete the circulation of the high-temperature medium in the main chamber; the second pipeline is used to transport lithium bicarbonate solution into the central cavity of the pyrolysis tower, and the lithium bicarbonate solution is thermally resolved to produce lithium carbonate particles after entering the pyrolysis tower. The precipitated lithium carbonate particles are transported to the thickener together with the liquid by the fourth pipeline, so that the thickener is precipitated to achieve solid-liquid separation to obtain lithium carbonate. At the same time, in order to prevent the lithium bicarbonate that has not been completely reacted in the liquid discharged from the pyrolysis tower from continuing to thermally resolve lithium carbonate particles when entering the fourth pipeline, causing the pipeline to be blocked, the utility model sets an outer sleeve on the outside of the fourth pipeline, and connects the outer sleeve to a cooling mechanism, so that the cooling mechanism transports cooling medium between the outer sleeve and the fourth pipeline, so that the liquid temperature in the fourth pipeline does not reach the pyrolysis temperature, so that the lithium bicarbonate that has not been completely reacted cannot continue to thermally resolve lithium carbonate particles, so as to ensure the smooth flow of the fourth pipeline. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 The utility model provides a schematic structural diagram of a battery-grade lithium carbonate purification system. DETAILED DESCRIPTION
[0016] Reference Figure 1 The utility model proposes a battery-grade lithium carbonate purification system, comprising: a pyrolysis tower 1, a thickener 2, and a cooling mechanism 3 for conveying a cooling medium, wherein:
[0017] The pyrolysis tower 1 has a main chamber a and a central chamber b arranged in the main chamber a. The top of the pyrolysis tower 1 is provided with a first pipeline 4 connected to the main chamber a for conveying a high-temperature medium into the main chamber a and a second pipeline 5 connected to the central chamber b for conveying a lithium bicarbonate solution into the central chamber b; the bottom of the pyrolysis tower 1 is provided with a third pipeline 6 connected to the main chamber a for drawing out the high-temperature medium in the main chamber a and a fourth pipeline 7 connecting the central chamber b with the thickener 2 for conveying the lithium bicarbonate solution in the central chamber b to the thickener 2. The outer sleeve 8 is provided on the outside of the fourth pipeline 7, and an inner support ring is provided between the inside of the outer sleeve 8 and the outside of the fourth pipeline 7 to connect the two so as to keep a distance between the two, and a plurality of inner support rings are provided and arranged at intervals along the conveying direction of the fourth pipeline 7. The cooling mechanism 3 is connected to the outer sleeve 8 for conveying a low-temperature medium into the inner portion of the outer sleeve 8.
[0018] During operation, the first pipeline 4 continuously transports high-temperature medium into the main chamber a of the pyrolysis tower 1 to keep the interior of the pyrolysis tower 1 in a high-temperature environment; the second pipeline 5 continuously transports lithium bicarbonate solution into the central chamber b of the pyrolysis tower 1; and the third pipeline 6 continuously draws high-temperature medium outward from the lower end of the pyrolysis tower 1 to accelerate the flow of the high-temperature medium in the main chamber a, and allows new high-temperature medium to continuously enter to perform heat exchange with the lithium bicarbonate solution in the central chamber b. The lithium bicarbonate solution is thermally resolved to remove lithium carbonate particles, and the liquid mixed with the lithium carbonate particles is transported to the thickener 2 by the fourth pipeline 7 to be precipitated by the thickener 2 to achieve solid-liquid separation to obtain lithium carbonate. At the same time, the cooling medium is transported to the outer sleeve 8 by the cooling mechanism 3 to cool the liquid entering the fourth pipeline 7, so that the temperature of the liquid in the fourth pipeline 7 does not reach the thermal decomposition temperature, so that the incompletely reacted lithium bicarbonate contained in the liquid cannot continue to thermally decompose lithium carbonate particles, thereby avoiding the continued thermal decomposition of lithium bicarbonate to produce lithium carbonate in the pipeline and causing pipeline blockage, thereby ensuring the smooth flow of the fourth pipeline 7 and ensuring the smooth progress of the purification work.
[0019] In this embodiment, one end of the outer sleeve 8 is a liquid inlet, and the other end is a liquid outlet; the cooling mechanism 3 has an inlet and a return port, the inlet of the cooling mechanism 3 is connected to the liquid inlet of the outer sleeve 8, and the return port of the cooling mechanism 3 is connected to the liquid outlet of the outer sleeve 8.
[0020] Furthermore, the cooling mechanism 3 includes a refrigeration tank with a refrigeration component inside, a liquid outlet pipe connecting the refrigeration tank and the liquid inlet of the outer sleeve 8, and a reflux pipe connecting the refrigeration tank and the liquid outlet of the outer sleeve 8, and the cooling medium is discharged through the liquid outlet pipe.
[0021] In addition, the present embodiment further provides a fifth pipeline 9 connected to the fourth pipeline 7 between both ends thereof. When crystals are still attached to the fourth pipeline 7, the fourth pipeline 7 and the cooling mechanism 3 stop working. At this time, flushing liquid is transported to the fourth pipeline 7 through the fifth pipeline 9 to utilize the impact force of the flushing liquid to flush away the attached crystals.
[0022] Furthermore, the fifth pipeline 9 has multiple outlet ends, each of which is arranged along the delivery pipe spacing of the fourth pipeline 7 and is connected to the fourth pipeline 7, and a switch valve is provided between each outlet end and the fourth pipeline 7, so that each outlet end and the fourth pipeline 7 can be independently controlled to be on and off. In specific work, by controlling the on and off of different outlet ends, the flushing position can be controlled at will, thereby avoiding the problem of weakened flushing force and incomplete flushing due to the flushing distance being too far from the blockage point.
[0023] Furthermore, the third pipeline 6 is spirally wound around the outside of the fifth pipeline 9, so as to use the high-temperature medium transported by the third pipeline 6 to heat the flushing liquid transported by the fifth pipeline 9. This is because the solubility of lithium carbonate in hot water is very small, so the use of hot water for flushing can avoid the loss of lithium carbonate during the flushing process. By using the high-temperature medium transported by the third pipeline 6 to heat the flushing liquid in the fifth pipeline 9, there is no need to add additional heating equipment, which simplifies the system structure and saves resources.
[0024] Furthermore, the third pipeline 6 and the fifth pipeline 9 are wrapped with an insulation layer 10 on the outside, so as to utilize the insulation layer 10 to wrap both on the inside, so as to enhance the heat exchange effect between the high-temperature medium in the third pipeline 6 and the flushing liquid in the fifth pipeline 9 .
[0025] Furthermore, the liquid inlet end of the fifth pipeline 9 is connected to the thickener 2, so that the upper liquid of the thickener 2 is used as a flushing liquid to flush the fourth pipeline 7, which can save resources and avoid increasing the burden on the thickener 2. At the same time, it can prevent impurities and ions in the water from affecting lithium carbonate.
[0026] As can be seen from the above, in the utility model, the first pipeline 4 is used to transport high-temperature medium to the main chamber a of the pyrolysis tower 1 so that the inside of the pyrolysis tower 1 is in a high-temperature environment, and the third pipeline 6 cooperates with the first pipeline 4 to complete the circulation of the high-temperature medium in the main chamber a; the second pipeline 5 is used to transport lithium bicarbonate solution to the central cavity b of the pyrolysis tower 1. After the lithium bicarbonate solution enters the pyrolysis tower 1, it is thermally decomposed to separate lithium carbonate particles. The precipitated lithium carbonate particles are transported to the thickener 2 together with the liquid through the fourth pipeline 7, so that the thickener 2 is precipitated to achieve solid-liquid separation to obtain lithium carbonate. At the same time, in order to prevent the unreacted lithium bicarbonate in the liquid discharged from the pyrolysis tower 1 from continuing to thermally decompose lithium carbonate particles when entering the fourth pipeline, causing the pipeline to be blocked, the utility model sets an outer sleeve 8 on the outside of the fourth pipeline 7, and connects the outer sleeve 8 to the cooling mechanism 3, so that the cooling mechanism 3 transports cooling medium between the outer sleeve 8 and the fourth pipeline 7, so that the liquid temperature in the fourth pipeline 7 does not reach the pyrolysis temperature, so that the unreacted lithium bicarbonate cannot continue to thermally decompose lithium carbonate particles, so as to ensure the smooth flow of the fourth pipeline 7.
[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A battery-grade lithium carbonate purification system, characterized in that: include: A pyrolysis tower (1), a thickener (2), and a cooling mechanism (3) for conveying a cooling medium, wherein: The pyrolysis tower (1) comprises a main chamber (a) and a central chamber (b) arranged in the main chamber (a); the top of the pyrolysis tower (1) is provided with a first pipeline (4) connected to the main chamber (a) for conveying a high-temperature medium into the main chamber (a) and a second pipeline (5) connected to the central chamber (b) for conveying a lithium bicarbonate solution into the central chamber (b); the bottom of the pyrolysis tower (1) is provided with a third pipeline (6) connected to the main chamber (a) for drawing out the high-temperature medium in the main chamber (a) and a fourth pipeline (7) connected to the central chamber (b) for conveying the lithium bicarbonate solution in the central chamber (b) to a thickener (2); An outer sleeve (8) is sleeved on the outside of the fourth pipeline (7), and an inner support ring is provided between the inside of the outer sleeve (8) and the outside of the fourth pipeline (7) to connect the two so as to maintain a distance between the two, and a plurality of inner support rings are provided and are spaced apart along the conveying direction of the fourth pipeline (7); The cooling mechanism (3) is connected to the outer casing (8) to transport a low-temperature medium into the inner part of the outer casing (8).
2. The battery-grade lithium carbonate purification system according to claim 1, characterized in that: A fifth pipeline (9) connected to the fourth pipeline (7) for conveying flushing liquid into the interior thereof is provided between the two ends of the fourth pipeline (7).
3. The battery-grade lithium carbonate purification system according to claim 2, characterized in that: The fifth pipeline (9) has a plurality of outlet ends, each of which is arranged along the delivery pipe spacing of the fourth pipeline (7) and is connected to the fourth pipeline (7), and a switch valve is provided between each outlet end and the fourth pipeline (7).
4. The battery-grade lithium carbonate purification system according to claim 2, characterized in that: The third pipeline (6) is spirally wound outside the fifth pipeline (9).
5. The battery-grade lithium carbonate purification system according to claim 4, characterized in that: It also includes a heat-insulating layer (10) that wraps the third pipeline (6) and the fifth pipeline (9) on their inner sides.
6. The battery-grade lithium carbonate purification system according to claim 2, characterized in that: The liquid inlet end of the fifth pipeline (9) is connected to the thickener (2).