Carbonization device and purification system

Abstract

The utility model discloses a carbonization device. The carbonization device comprises a carbonization tower, a cooling mechanism and a turbidity meter, the carbonization tower is provided with a return port and a discharge port which are communicated with the interior of the carbonization tower; the cooling mechanism comprises a cooler and a material circulating pump, the discharging end of the cooler is communicated with the material returning opening of the carbonization tower, and the material circulating pump is connected between the discharging opening of the carbonization tower and the feeding end of the cooler, so that materials can circularly flow in the cooler and the carbonization tower; and the turbidity meter is arranged at the discharge hole of the carbonization tower. A material containing lithium carbonate is carbonized in the carbonization tower to form lithium bicarbonate, and in the carbonization process, the material circularly flows in the cooler and the carbonization tower through the material circulating pump, so that the material is cooled, and the carbonization effect of the lithium carbonate is improved. Meanwhile, the turbidity meter can be used for detecting the turbidity of the material at the discharge hole of the carbonization tower, so that the carbonization degree can be judged according to the turbidity, the carbonization degree is ensured to meet the requirement, and the subsequent purification effect is ensured. The utility model further discloses a purification system.

Description

Technical Field

[0001] This application belongs to the technical field of lithium carbonate purification equipment, and particularly relates to a carbonization device and a purification system. Background Art

[0002] As a core energy storage technology, electrochemical energy storage technology is constantly deepening and innovating. Lithium-ion batteries have the advantages of high working voltage, large energy density, long cycle life, and low environmental pollution, and are widely used in many fields such as military equipment, aerospace, electric vehicles, and digital products. They are one of the most promising new generation energy storage devices at present. High-purity lithium carbonate is one of the core raw materials for lithium-ion batteries, and is mainly used in the preparation of high-end lithium-ion battery cathode materials and battery-grade lithium fluoride.

[0003] As one of the processes for purifying lithium carbonate, the carbonization decomposition method mainly involves first preparing a lithium carbonate slurry, then introducing carbon dioxide into the lithium carbonate slurry to form lithium bicarbonate, and then performing pyrolysis to make lithium bicarbonate decompose to generate high-purity lithium carbonate. At present, during the process of carbonizing lithium carbonate to form lithium bicarbonate, it is impossible to judge the carbonization degree of lithium carbonate, and it is easy to have a poor carbonization degree and be transported to the downstream process, thus affecting the purification effect. Utility Model Content

[0004] The technical problem to be solved by this application is that during the process of carbonizing lithium carbonate to form lithium bicarbonate at present, it is impossible to judge the carbonization degree of lithium carbonate, thus affecting the purification effect. Provided is a carbonization device and a purification system that can detect the carbonization degree and ensure the purification effect.

[0005] The technical solution proposed by this application is as follows:

[0006] A carbonization device, comprising:

[0007] A carbonization tower, having a return port and a discharge port that communicate with the inside of the carbonization tower;

[0008] A cooling mechanism, including a cooler and a material circulation pump. The discharge end of the cooler is communicated with the return port of the carbonization tower, and the material circulation pump is connected between the discharge port of the carbonization tower and the feed end of the cooler, so that the material can circulate between the cooler and the carbonization tower;

[0009] A turbidimeter, arranged at the discharge port of the carbonization tower.

[0010] Further, the carbonization device further includes a circulation mechanism. The carbonization tower is further provided with an air outlet and a return air port that communicate with the inside of the carbonization tower. Both ends of the circulation mechanism are communicated with the air outlet and the return air port respectively, so that carbon dioxide can circulate between the carbonization tower and the circulation mechanism.

[0011] Further, the carbonization device further includes a gas supply mechanism and an exhaust mechanism. The gas supply mechanism is connected to the carbonization tower or the circulation mechanism for inputting carbon dioxide, and the exhaust mechanism is connected to the circulation mechanism.

[0012] Further, the gas outlet is located at the top of the carbonization tower, and the discharge port is located at the bottom of the carbonization tower. In the height direction of the carbonization tower, the return material port is located between the gas outlet and the discharge port, and the return gas port is located between the return material port and the discharge port.

[0013] Further, the carbonization device further includes a temperature detector, and the temperature detector is arranged at the discharge end of the cooler.

[0014] Further, the carbonization device further includes a first pipeline, a first control valve, a second pipeline and a second control valve. The first pipeline is connected between the material circulation pump and the discharge port of the carbonization tower. The first control valve is arranged on the first pipeline. One end of the second pipeline is connected to the first pipeline, and the connection position of the second pipeline and the first pipeline is located between the first control valve and the discharge port. The second control valve is arranged on the second pipeline.

[0015] Further, the carbonization tower further includes a feed port for feeding materials into the carbonization tower. The discharge port is located at the bottom of the carbonization tower. In the height direction of the carbonization tower, the feed port is located between the return material port and the discharge port;

[0016] The carbonization device further includes a feeding mechanism, and the feeding mechanism is communicated with the feed port to feed materials into the carbonization tower.

[0017] Further, the feeding mechanism includes a stirring tank and a feeding pump. The stirring tank is used for stirring raw materials, and the feeding pump is connected between the stirring tank and the feed port.

[0018] Further, the feeding mechanism includes at least two feeding pumps and at least two conveying valves. At least two feeding pumps are all connected between the stirring tank and the feed port. At least two conveying valves correspond to at least two feeding pumps one by one, and the conveying valves are arranged between the stirring tank and the feeding pumps.

[0019] A purification system includes the carbonization device as described above.

[0020] With the above carbonization device, the material containing lithium carbonate is carbonized in the carbonization tower to form lithium bicarbonate. During the carbonization process, the material circulates between the cooler and the carbonization tower through the material circulation pump, thereby cooling the material and improving the carbonization effect of lithium carbonate. At the same time, the turbidity meter can detect the turbidity of the material at the outlet of the carbonization tower, so that the carbonization degree can be judged according to the turbidity, ensuring that the carbonization degree meets the requirements and thus ensuring the subsequent purification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings are used to provide a further understanding of the present application and form a part of the specification. They are used together with the embodiments of the present application to explain the present application and do not constitute a limitation to the present application.

[0022] Figure 1 FIG. is a schematic structural diagram of a carbonization device provided by an embodiment of the present application;

[0023] Figure 2 FIG. is a schematic structural diagram of a feeding mechanism provided by another embodiment of the present application.

[0024] Reference Numeral Description:

[0025] 110, carbonization tower; 111, return material port; 112, outlet; 113, gas outlet; 114, return gas port; 115, inlet; 116, feed port; 120, cooler; 130, material circulation pump; 141, gas circulation pipeline; 142, gas circulation pump; 143, gas circulation valve; 150, gas supply mechanism; 160, exhaust mechanism; 171, first pipeline; 172, first control valve; 173, second pipeline; 174, second control valve; 210, stirring tank; 221, feeding pump; 222, conveying valve; 231, material circulation pipeline; 232, material circulation valve; 241, feeding pipeline; 242, feeding valve; 251, discharge pipeline; 252, discharge valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0027] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0028] On the one hand, as Figure 1 shown, an embodiment of the present application provides a carbonization device, including a carbonization tower 110, a cooling mechanism, and a turbidimeter.

[0029] The carbonization tower 110 has a return port 111 and a discharge port 112 that communicate with the inside of the carbonization tower 110. The cooling mechanism includes a cooler 120 and a material circulation pump 130. The discharge end of the cooler 120 is communicated with the return port 111 of the carbonization tower 110. The material circulation pump 130 is connected between the return port 111 of the carbonization tower 110 and the feed end of the cooler 120, so that the material circulates between the cooler 120 and the carbonization tower 110. The turbidimeter is arranged at the discharge port 112 of the carbonization tower 110 and is used to detect the turbidity of the material in the carbonization tower 110.

[0030] It should be noted that in the above embodiment, the material is a mixture, at least including lithium carbonate and / or lithium bicarbonate. The carbonization tower 110 is used to carbonize lithium carbonate to form lithium bicarbonate. The cooling tower is used to cool the material during the carbonization process, thereby improving the carbonization effect in the carbonization tower 110.

[0031] Using the above carbonization device, the material containing lithium carbonate is carbonized in the carbonization tower 110 to form lithium bicarbonate. During the carbonization process, the material circulates between the cooler 120 and the carbonization tower 110 through the material circulation pump 130, thereby cooling the material and improving the carbonization effect of lithium carbonate. At the same time, the turbidimeter can detect the turbidity of the material at the discharge port 112 of the carbonization tower 110, so that the carbonization degree can be judged according to the turbidity, ensuring that the carbonization degree meets the requirements, and thus ensuring the subsequent purification effect.

[0032] It should be explained that for the carbonization degree of lithium carbonate, the more turbid the material is, the lower the carbonization degree of lithium carbonate; the clearer the material is, the higher the carbonization degree of lithium carbonate. Therefore, the turbidity of the material can be detected by the turbidimeter, and then the carbonization degree of the material can be judged according to the turbidity.

[0033] In addition, it should be further noted that in this embodiment, the cooler 120 is a heat exchanger, which also has a liquid inlet and a liquid outlet for the cooling medium to enter and flow out, so as to exchange heat with the material inside the cooler 120 to cool the material. Further, the cooler 120 also has a drain port for draining the cooling medium inside.

[0034] In one embodiment, the carbonization tower 110 is also provided with an air outlet 113 and a return air port 114 that communicate with the inside of the carbonization tower 110. The carbonization device further includes a circulation mechanism, and both ends of the circulation mechanism are respectively communicated with the air outlet 113 and the return air port 114, so that carbon dioxide can circulate between the carbonization tower 110 and the circulation mechanism. In this way, the carbon dioxide input into the carbonization tower 110 can be utilized as much as possible, saving the consumption of carbon dioxide.

[0035] Further, the circulation mechanism includes a gas circulation pipeline 141 and a gas circulation pump 142. Both ends of the gas circulation pipeline 141 are respectively communicated with the air outlet 113 and the return air port 114, and the gas circulation pump 142 is arranged on the gas circulation pipeline 141 to drive the circulation of carbon dioxide.

[0036] Specifically Figure 1 In the illustrated embodiment, the circulation mechanism further includes a gas circulation valve 143, and the gas circulation valve 143 is arranged on the circulation pipeline to control the on-off of the circulation pipeline.

[0037] In one embodiment, the carbonization device further includes a gas supply mechanism 150, and the gas supply mechanism 150 is connected to the carbonization tower 110 or the circulation mechanism for inputting carbon dioxide into the carbonization tower 110. Specifically Figure 1 In the illustrated embodiment, the carbonization tower 110 is also provided with an air inlet 115 that communicates with its inside, and the gas supply mechanism 150 is communicated with the air inlet 115. In other embodiments, the gas supply mechanism 150 can also be directly connected to the circulation mechanism to input carbon dioxide into the carbonization tower 110 through the circulation mechanism, which is not limited herein.

[0038] In one embodiment, the carbonization device further includes an exhaust mechanism 160, and the exhaust mechanism 160 is connected to the circulation mechanism for discharging carbon dioxide to other processes or storage locations after carbonization is completed, avoiding waste of carbon dioxide. It can be understood that in other embodiments, the exhaust mechanism 160 can also be directly connected to the air outlet 113 of the carbonization tower 110, which is not limited herein. Further, the exhaust mechanism 160 is connected to the circulation pipeline, and the connection position is between the carbonization tower 110 and the gas circulation valve 143.

[0039] In addition, it is certain that both the gas supply mechanism 150 and the exhaust mechanism 160 can be opened and closed. For example, when the gas supply mechanism 150 is opened, it can conduct the gas source and the carbonation tower 110, and input carbon dioxide into the carbonation tower 110 in the past. When it is closed, it can cut off the gas source and the carbonation tower 110; when the exhaust mechanism 160 is opened, it can conduct the carbonation tower 110 and other processes or storage locations, and when it is closed, it can cut off the carbonation tower 110 and other processes or storage locations. Specifically, Figure 1 In the illustrated embodiment, a valve is provided on the pipeline connecting the gas supply mechanism 150 and the carbonation tower 110, and a valve is also provided on the pipeline connecting the exhaust mechanism 160 and the circulation mechanism. The opening and closing are achieved by controlling the on-off of the pipeline through the valve.

[0040] In one embodiment, the gas outlet 113 is located at the top of the carbonation tower 110, the discharge port 112 is located at the bottom of the carbonation tower 110, and in the height direction of the carbonation tower 110, the return material port 111 is located between the gas outlet 113 and the discharge port 112, and both the gas return port 114 and the gas inlet 115 are located between the return material port 111 and the discharge port 112. In this way, the carbon dioxide in the carbonation tower 110 can flow from bottom to top, and during this process, the carbon dioxide can fully contact the material flowing from top to bottom, improving the carbonation effect.

[0041] Furthermore, both the gas inlet 115 and the gas return port 114 are arranged close to the discharge port 112, and a gas distribution pipe communicating with the gas return port 114 is provided in the carbonation tower 110. The gas distribution pipe enables the carbon dioxide to enter the carbonation tower 110 more evenly, thereby further improving the carbonation effect.

[0042] In one embodiment, the carbonation device further includes a first pipeline 171, a first control valve 172, a second pipeline 173, and a second control valve 174. The first pipeline 171 is connected between the material circulation pump 130 and the discharge port 112 of the carbonation tower 110. The first control valve 172 is arranged on the first pipeline 171 to control the on-off of the first pipeline 171. One end of the second pipeline 173 is connected to the first pipeline 171, and the connection position of the second pipeline 173 and the first pipeline 171 is located between the first control valve 172 and the discharge port 112. The second control valve 174 is arranged on the second pipeline 173 to control the on-off of the second pipeline 173.

[0043] In this way, before the carbonation degree of lithium carbonate meets the requirements, the first control valve 172 can be opened and the second control valve 174 can be closed, and the material circulates between the cooler 120 and the carbonation tower 110; after the carbonation degree of lithium carbonate meets the requirements, the material circulation pump 130 and the first control valve 172 can be closed, and then the second control valve 174 can be opened to discharge the material through the second pipeline 173 to the downstream process for further treatment.

[0044] In one embodiment, the carbonization device further includes a temperature detector disposed at the discharge end of the cooler 120 to detect the temperature of the material cooled by the cooler 120. Preferably, the cooler 120 needs to ensure that the temperature of the material at its discharge end is about 5°C to ensure the carbonization effect.

[0045] In one embodiment, the carbonization tower 110 further includes a feed inlet 116 for the material to enter the carbonization tower 110. In the height direction of the carbonization tower 110, the feed inlet 116 is located between the return port 111 and the discharge port 112. Specifically, the material containing lithium carbonate is input into the carbonization tower 110 through the feed inlet 116, and then the feed inlet 116 is closed. The carbonization of the material is mainly achieved by the cyclic flow of the material between the cooler 120 and the carbonization tower 110, that is, the feed inlet 116 is mainly used to enable the material to enter the carbonization tower 110. Further, the carbonization device further includes a feeding mechanism, and the feeding mechanism is communicated with the feed inlet 116 to input the material into the carbonization tower through the feed inlet 116.

[0046] Please refer to Figure 2 , in one embodiment, the feeding mechanism includes a stirring tank 210 and a feeding pump 221. The stirring tank 210 is used to stir the raw materials. The raw materials can be water and low-purity solid lithium carbonate, and the slurry-shaped material is formed by stirring in the stirring tank 210. The lithium carbonate in slurry state can also be directly added, or water, low-purity solid lithium carbonate and lithium carbonate slurry can be added simultaneously. The feeding pump 221 is connected between the stirring tank 210 and the feed inlet 116 to pump the material in the stirring tank 210 into the carbonization tower 110. Among them, the stirring tank 210 can be provided with a plurality of feeding ports according to the feeding method. In addition, if gas is generated during the stirring process, an exhaust port can also be provided at the top of the stirring tank 210.

[0047] Further, the feeding mechanism includes at least two feeding pumps 221 and at least two conveying valves 222. At least two feeding pumps 221 are both connected between the stirring tank 210 and the feed inlet 116. At least two conveying valves 222 correspond to at least two feeding pumps 221 one by one, and the conveying valves 222 are disposed between the stirring tank 210 and the feeding pumps 221 to control the on-off between the stirring tank 210 and the feeding pumps 221, so that at least two feeding pumps 221 are alternately communicated with the stirring tank 210. In this way, when a certain feeding pump 221 fails, it can be disconnected from the stirring tank 210, and then the stirring tank 210 is communicated with other normal feeding pumps 221. Specifically, in the embodiment shown in Figure 2 , the number of the feeding pumps 221 is two.

[0048] It can be understood that the feeding pump 221 is connected to the mixing tank 210 and the feeding port 116 through pipelines, and the conveying valves 222 are arranged on the corresponding pipelines. In order to prevent the material from entering the discharge end of other feeding pumps 221 when one feeding pump 221 conveys the material, the conveying valves 222 can be arranged both upstream and downstream of the feeding pump 221.

[0049] In one embodiment, the feeding mechanism further includes a material circulation pipeline 231, a material circulation valve 232, a feeding pipeline 241 and a feeding valve 242. The material circulation pipeline 231 is connected between the feeding pump 221 and the mixing tank 210, and the material circulation valve 232 is arranged on the material circulation pipeline 231 to control the on-off of the material circulation pipeline 231. The feeding pipeline 241 is connected between the feeding pump 221 and the feeding port 116 of the carbonization tower 110, and the feeding valve 242 is arranged on the feeding pipeline 241 to control the on-off of the feeding pipeline 241.

[0050] It can be understood that during the mixing process of the raw materials in the mixing tank 210, in order to make the mixing more sufficient, the feeding valve 242, the feeding pump 221 and the material circulation valve 232 can be closed to make the raw materials circulate. At the same time, when multiple feeding pumps 221 are provided, the material circulation pipeline 231 is also connected to multiple feeding pumps 221 simultaneously.

[0051] In one embodiment, the feeding mechanism further includes a drain pipeline 251 and a drain valve 252. The drain pipeline 251 is connected between the mixing tank 210 and the feeding pump 221, and the drain valve 252 is connected to the pipeline downstream of the feeding pump 221 and is located between the feeding pump 221 and the conveying valve 222 downstream of the feeding pump 221. When it is necessary to drain the material in the mixing tank 210, the drain valve 252 and the conveying valve 222 upstream of the feeding pump 221 are opened, the conveying valve 222 downstream of the feeding pump 221 is closed, and then the material can be pumped out through the feeding pump 221.

[0052] It can be understood that a valve is also provided at one end of the drain pipeline 251 connected to the mixing tank 210 to control the on-off. In addition, for the setting of multiple feeding pumps 221, the drain pipeline 251 can be connected to multiple feeding pumps 221 simultaneously, and multiple drain valves 252 can be correspondingly arranged for multiple feeding pumps 221.

[0053] For the convenience of understanding the technical solution of the present application, hereby in combination with Figure 1 and Figure 2 the process flow of the carbonization device in the above embodiment is described as follows:

[0054] First, add raw materials to the mixing tank 210. Through the mixing tank 210, the raw materials are evenly mixed to form a lithium carbonate slurry. During the mixing process, the material circulation valve 232, the corresponding feeding pump 221, and the conveying valve 222 can be opened to make the material circulate. After the mixing is completed, the material circulation valve 232 is closed, and the feeding valve 242 is opened. The feeding pump 221 pumps the lithium carbonate slurry into the carbonization tower 110, and then the feeding port 116 of the carbonization tower 110 is closed.

[0055] Next, open the first control valve 172 and close the second control valve 174. The material circulates between the cooler 120 and the carbonization tower 110 through the material circulation pump 130, and carbon dioxide circulates between the circulation pipeline and the carbonization tower 110 through the gas circulation pump 142. During the circulation of both, the cooler 120 cools down the material, and the carbonization tower 110 carbonizes the material. After it is determined that the carbonization of lithium carbonate meets the requirements according to the turbidity detected by the turbidimeter, the material circulation pump 130 and the first control valve 172 are closed, and the second control valve 174 is opened to discharge the material to the downstream process through the second pipeline 173.

[0056] It should be noted that, to ensure sufficient carbonization, the gas supply mechanism 150 can be turned on multiple times to input carbon dioxide into the carbonization tower 110, and during the gas circulation process, the gas supply mechanism 150 and the exhaust mechanism 160 can be kept in the closed state. After the carbonization is completed, the gas circulation valve 143 is closed, and the exhaust mechanism 160 is opened to discharge the excess carbon dioxide.

[0057] On the other hand, the present application also provides a purification system, which includes the carbonization device in the above embodiment.

[0058] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A carbonization device, characterized in that, Comprising: A carbonation tower having a return port and a discharge port communicating with the interior of the carbonation tower; A cooling mechanism including a cooler and a material circulation pump, the discharge end of the cooler communicating with the return port of the carbonation tower, the material circulation pump being connected between the discharge port of the carbonation tower and the feed end of the cooler so that the material can circulate between the cooler and the carbonation tower; A turbidimeter disposed at the discharge port of the carbonation tower.

2. The carbonization device according to claim 1, characterized in that, The carbonation device further includes a circulation mechanism, and the carbonation tower is further provided with a gas outlet and a gas return port communicating with the interior of the carbonation tower, and both ends of the circulation mechanism are respectively communicated with the gas outlet and the gas return port so that carbon dioxide can circulate between the carbonation tower and the circulation mechanism.

3. The carbonization device according to claim 2, wherein The carbonation device further includes a gas supply mechanism and an exhaust mechanism, the gas supply mechanism is connected to the carbonation tower or the circulation mechanism for inputting carbon dioxide, and the exhaust mechanism is connected to the circulation mechanism.

4. The carbonization device according to claim 3, wherein, The gas outlet is located at the top of the carbonation tower, the discharge port is located at the bottom of the carbonation tower, and in the height direction of the carbonation tower, the return port is located between the gas outlet and the discharge port, and the gas return port is located between the return port and the discharge port.

5. The carbonization device according to claim 1, characterized in that, The carbonation device further includes a temperature detector disposed at the discharge end of the cooler.

6. The carbonization device according to claim 1, characterized in that, The carbonation device further includes a first pipeline, a first control valve, a second pipeline and a second control valve. The first pipeline is connected between the material circulation pump and the discharge port of the carbonation tower, the first control valve is disposed on the first pipeline, one end of the second pipeline is connected to the first pipeline, and the connection position of the second pipeline and the first pipeline is located between the first control valve and the discharge port, and the second control valve is disposed on the second pipeline.

7. The carbonization device according to claim 1, characterized in that, The carbonation tower further includes a feed port for feeding material into the carbonation tower, the discharge port is located at the bottom of the carbonation tower, and in the height direction of the carbonation tower, the feed port is located between the return port and the discharge port; The carbonation device further includes a feeding mechanism communicating with the feed port for feeding material into the carbonation tower.

8. The carbonization device according to claim 7, wherein The feeding mechanism includes a stirring tank and a feeding pump, the stirring tank is used for stirring the raw material, and the feeding pump is connected between the stirring tank and the feed port.

9. The carbonization device according to claim 8, wherein The feeding mechanism includes at least two feeding pumps and at least two conveying valves. At least two feeding pumps are all connected between the stirring tank and the feed port, at least two conveying valves correspond to at least two feeding pumps one by one, and the conveying valves are disposed between the stirring tank and the feeding pumps.

10. A purification system, characterized in that, Including the carbonation device according to any one of claims 1-9.

Images