DMC recovery device and circulation system
By designing DMC recycling devices, including precipitation, distillation and condensation equipment, the problem of the decrease in the concentration of DMC mixed liquid during lithium battery recycling is solved, efficient recycling and recycling of DMC is achieved, and production costs are reduced.
Patent Information
- Application Number
- CN202420752137.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-12
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-04-12
AI Technical Summary
During the lithium battery recycling process, the concentration of DMC mixed liquid decreases due to contamination, which cannot meet the requirements of subsequent processes, resulting in an increase in processing costs.
A DMC recycling device is designed, including precipitation equipment, distillation equipment and condensation equipment. The DMC mixed liquid is precipitated and layered through the precipitation equipment, and the distillation equipment distiles the turbid liquid. The condensation equipment condenses the gaseous DMC into liquid to realize the recycling and recycling of DMC.
Through this device, DMC can be effectively recycled and reused, production costs can be reduced, economic benefits can be improved, and problems such as large consumption of DMC and high recycling costs can be solved.
Smart Images
Figure CN222778529U_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present application relate to the technical field of DMC recovery, and in particular to a DMC recovery device and a circulation system. Background Art
[0002] With the continuous application of new energy batteries, more and more batteries have begun to be phased out. Dimethyl carbonate (DMC) is often used in the recycling and reuse of obsolete lithium batteries, such as the core module demoulding process and the positive electrode cleaning process. Since the market price of DMC is relatively high, the consumption cost in the recycling of waste lithium batteries has become an important factor affecting the economic benefits of the entire recycling process.
[0003] However, in the process of battery recycling, it is inevitable that the DMC will be contaminated by the residues such as the pole powder and electrolyte, resulting in a decrease in its concentration, which cannot meet the requirements of the subsequent processes. The traditional treatment method is to directly distill the contaminated DMC mixture to obtain pure DMC, and recycling and utilization will increase the processing cost. Utility Model Content
[0004] The embodiments of the present application provide a DMC recovery device and a circulation system to solve the problems of large DMC consumption and high recovery cost in the process of recycling waste lithium batteries.
[0005] The embodiments of the present application provide the following technical solutions to solve the above technical problems:
[0006] The embodiment of the present application provides a DMC recovery device, comprising:
[0007] A precipitation device, the precipitation device comprising a tank body, the tank body having a precipitation chamber, the top of the tank body having an inlet connected to the precipitation chamber, the inlet being used to pass the DMC mixed solution recovered from the electrode cleaning device and the electrode dispersing and demoulding device into the precipitation chamber;
[0008] The bottom end of the tank body has a first outlet connected to the sedimentation chamber, the first outlet is provided with a first control valve, and the first outlet is used to discharge the turbid liquid of the DMC mixed liquid after sedimentation;
[0009] The side wall of the tank body is provided with a second outlet communicated with the sedimentation chamber, the second outlet is provided with a second control valve, and the second outlet is used to discharge the clear liquid of the DMC mixed liquid after sedimentation.
[0010] Beneficial effects of the embodiments of the present application: The DMC recovery device provided in the embodiments of the present application includes a precipitation device, the precipitation device includes a tank body, the tank body has a precipitation chamber, the top of the tank body has an inlet connected to the precipitation chamber, and the inlet is used to pass the DMC mixed liquid recovered from the electrode cleaning equipment and the electrode dispersion and demolding equipment into the precipitation chamber. The bottom end of the tank body has a first outlet connected to the precipitation chamber, the first outlet is provided with a first control valve, and the first outlet is used to discharge the turbid liquid of the DMC mixed liquid after precipitation. The side wall of the tank body has a second outlet connected to the precipitation chamber, the second outlet is provided with a second control valve, and the second outlet is used to discharge the clear liquid of the DMC mixed liquid after precipitation. That is to say, the DMC mixed liquid recovered from the electrode cleaning equipment and the electrode dispersion and demolding equipment is received through the precipitation chamber inside the tank body, and the DMC mixed liquid is precipitated and layered. The turbid liquid after precipitation is collected through the first outlet arranged at the bottom of the tank body, and the clear liquid after precipitation is collected through the second outlet arranged on the side wall of the tank body. The clear liquid is recovered to the electrode dispersion and demoulding equipment for recycling, and the turbid liquid is passed into the subsequent process for distillation and condensation to obtain pure DMC which is recovered to the electrode cleaning equipment for recycling.
[0011] In a possible implementation, the inner wall of the precipitation chamber near the first outlet is a conical surface, and the large end of the conical surface faces the inlet, and the small end of the conical surface faces the first outlet.
[0012] In a possible implementation manner, the tank body includes a straight cylinder body and a conical cylinder body connected to each other, and the inner surface of the conical cylinder body forms the conical surface;
[0013] The second outlet is provided on at least one of the straight cylinder and the conical cylinder.
[0014] In a possible implementation manner, there are multiple second outlets, and the multiple second outlets are spaced apart along the height direction of the tank body.
[0015] In a possible implementation, a distillation device is further included, wherein the inlet of the distillation device is connected to the first outlet of the precipitation device, and the distillation device is used to heat the turbid liquid to obtain gaseous DMC.
[0016] In a possible implementation, the heating temperature of the distillation equipment is 90-93°C.
[0017] In a possible implementation, a condensing device is further included, wherein the inlet of the condensing device is connected to the outlet of the distillation device, and the condensing device is used to condense the gaseous DMC to obtain liquid DMC.
[0018] In a possible implementation, a plurality of partitions are provided in the sedimentation chamber of the sedimentation device, and the partitions are used to accelerate the sedimentation of the DMC mixed solution to obtain the clear solution and the turbid solution.
[0019] In a possible implementation manner, along the height direction of the tank body, the lowest position of the second opening on the tank body is not lower than the boundary position between the clear liquid and the turbid liquid;
[0020] The boundary position is the boundary where the ratio of the clear liquid to the turbid liquid in the sedimentation chamber is 8:2.
[0021] The present application also provides a DMC circulation system, including:
[0022] Pole piece dispersing and demoulding equipment, pole piece cleaning equipment, and the above-mentioned DMC recovery device, the inlet of the precipitation device in the DMC recovery device is connected with the liquid outlet of the dispersing and demoulding equipment and the liquid outlet of the pole piece cleaning equipment;
[0023] The second opening of the precipitation device in the DMC recovery device is connected to the liquid inlet of the dispersion demoulding device;
[0024] The outlet of the condensation device in the DMC recovery device is connected to the liquid inlet of the pole piece cleaning device.
[0025] In addition to the technical problems solved by the present application, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by a DMC recovery device and circulation system provided by the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments of the present application or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only part of the embodiments of the present application. These drawings and text descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application for those skilled in the art by referring to specific embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0027] Figure 1 A schematic diagram of the structure of a DMC recovery device provided in an embodiment of the present application;
[0028] Figure 2 This is a schematic diagram of the DMC circulation system provided in an embodiment of the present application.
[0029] Description of reference numerals:
[0030] 100-DMC recovery device; 200-distillation equipment; 300-condensation equipment; 400-pole cleaning equipment; 500-pole dispersing and demoulding equipment;
[0031] 110-tank body; 120-precipitation chamber; 130-inlet; 140-first outlet; 150-second outlet; 160-conical surface;
[0032] 111-straight cylinder; 112-conical cylinder;
[0033] 141- first control valve;
[0034] 151-Second control valve. DETAILED DESCRIPTION
[0035] With the continuous application of new energy batteries, more and more batteries have begun to be phased out. Dimethyl carbonate (DMC) is often used in the recycling and reuse of obsolete lithium batteries, such as the core module demoulding process and the positive electrode cleaning process. Since the market price of DMC is relatively high, the consumption cost in the recycling of waste lithium batteries has become an important factor affecting the economic benefits of the entire recycling process.
[0036] In view of this, the embodiment of the present application is provided with a precipitation device, a distillation device and a condensation device, and the DMC mixed liquid is precipitated and layered by the precipitation device to obtain a clear liquid and a turbid liquid. The turbid liquid is distilled by the distillation device to obtain gaseous DMC, and the gaseous DMC is condensed into liquid DMC by the condensation device. The clear liquid is recovered to the pole piece dispersing and demolding device for recycling, and the liquid DMC is recovered to the pole piece cleaning device for recycling.
[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0038] Figure 1 This is a schematic diagram of the structure of the DMC recovery device provided in the embodiment of the present application. Figure 2 This is a schematic diagram of the DMC circulation system provided in an embodiment of the present application.
[0039] The present application embodiment provides a DMC circulation system, see Figure 2As shown. The DMC circulation system includes a pole piece dispersing and demoulding device 500, a pole piece cleaning device 400, and a DMC recovery device 100. Among them, the DMC recovery device 100 is used to recover the DMC mixed liquid used in the pole piece dispersing and demoulding device 500 and the pole piece cleaning device 400, and adopts a static sedimentation method to obtain a clear liquid and a turbid liquid in the DMC mixed liquid, and circulates the clear liquid to the pole piece dispersing and demoulding device 500. The turbid liquid is distilled through the distillation device 200 to obtain gaseous DMC, and the gaseous DMC is condensed through the condensation device 300 to obtain liquid DMC, and the liquid DMC is circulated to the pole piece cleaning device 400, so as to realize the recovery and reuse of DMC, so as to reduce production costs and improve economic benefits.
[0040] It should be noted that the pole piece dispersing and demoulding device 500 is used to separate the pole piece from the diaphragm. During the dispersing and demoulding process, DMC is used as a demoulding agent. The pole piece obtained by the pole piece dispersing and demoulding device 500 needs to be cleaned by the pole piece cleaning device 400 to remove the residues and impurities on the surface of the pole piece to ensure the cleanliness of the pole piece. DMC is also used in the cleaning process.
[0041] It is understandable that the DMC used in the pole piece dispersing and demolding equipment 500 and the pole piece cleaning equipment 400 contains some impurities and particulate matter. The DMC mixed liquid is recovered to the DMC recovery device 100, and the clear liquid and the turbid liquid are separated by static sedimentation. For the clear liquid with a higher concentration, it can be directly circulated to the pole piece dispersing and demolding equipment 500 and used again in the demolding process. For the turbid liquid containing more impurities and particulate matter, further treatment is taken to obtain a higher concentration of liquid DMC, which is circulated to the pole piece cleaning equipment 400 and used again in the pole piece cleaning process.
[0042] The embodiment of the present application provides a DMC recovery device 100, which includes a tank body 110, a sedimentation chamber 120 in the tank body 110, and an inlet 130 connected to the sedimentation chamber 120 at the top of the tank body 110. The inlet 130 is used to pass the DMC mixed liquid recovered from the electrode cleaning device 400 and the electrode dispersing and demolding device 500 into the sedimentation chamber 120. The bottom end of the tank body 110 has a first outlet 140 connected to the sedimentation chamber 120, and the first outlet 140 is provided with a first control valve 141. The first outlet 140 is used to discharge the turbid liquid of the DMC mixed liquid after precipitation. The side wall of the tank body 110 has a second outlet 150 connected to the sedimentation chamber 120, and the second outlet 150 is provided with a second control valve 151. The second outlet 150 is used to discharge the clear liquid of the DMC mixed liquid after precipitation.
[0043] like Figure 1As shown, the precipitation device includes a tank body 110 provided with a precipitation chamber 120, and the precipitation chamber 120 is used to accommodate and process the DMC mixed solution recovered from the electrode cleaning device 400 and the electrode dispersing and demolding device 500. In a possible embodiment, the top of the tank body 110 is provided with an inlet 130 connected to the precipitation chamber 120, and the inlet 130 is used to receive the DMC mixed solution recovered from the electrode cleaning device 400 and the electrode dispersing and demolding device 500. After the DMC mixed solution enters the precipitation chamber 120 through the inlet 130, due to the effect of gravity, the upper layer is a clear liquid with a higher concentration in the DMC mixed solution, and the solid particles and impurities in the DMC mixed solution will gradually settle to the bottom of the precipitation chamber 120, and the lower layer is a turbid liquid with a lower concentration in the DMC mixed solution.
[0044] Please continue reading Figure 1 ,like Figure 1 As shown, the bottom end of the tank body 110 is provided with a first outlet 140 connected to the sedimentation chamber 120, and the first outlet 140 is used to discharge the turbid liquid in the DMC mixed liquid after sedimentation. In a possible embodiment, a first control valve 141 is provided at the first outlet 140, and the first control valve 141 is used to prevent the backflow of the turbid liquid in the sedimentation equipment, and to adjust the discharge amount of the turbid liquid by controlling the switch of the first control valve 141. A second outlet 150 connected to the sedimentation chamber 120 is provided on the side wall of the tank body 110, and the second outlet 150 is used to discharge the clear liquid in the DMC mixed liquid after sedimentation. In a possible embodiment, a second control valve 151 is provided at the second outlet 150, and the discharge amount of the clear liquid is adjusted by controlling the switch of the second control valve 151.
[0045] It should be noted that the first control valve 141 and the second control valve 151 may be any one of a manual control valve, an electric control valve, a pneumatic control valve, and a regulating valve, and may be but are not limited to the above valves.
[0046] In some embodiments of the present application, the inner wall of the precipitation chamber 120 near the first outlet 140 is a conical surface 160, and the large end of the conical surface 160 faces the inlet 130, and the small end of the conical surface 160 faces the first outlet 140. Figure 1 As shown, the inner wall of the sedimentation chamber 120 is provided with a tapered surface 160 , and the tapered surface 160 is close to the first outlet 140 . The tapered surface 160 in the sedimentation chamber 120 can accelerate the static sedimentation speed of the DMC mixed liquid.
[0047] In a possible implementation, the conical surface 160 includes a large end and a small end. The large end of the conical surface 160 faces the inlet 130. When the DMC mixed liquid enters the sedimentation chamber 120 through the inlet 130, the large end of the conical surface 160 can guide the DMC mixed liquid to diffuse around along the conical surface 160, thereby preventing the DMC mixed liquid from directly impacting the first outlet 140 at the bottom of the sedimentation chamber 120, thereby ensuring that the DMC mixed liquid is evenly distributed in the sedimentation chamber 120 and improving the sedimentation effect.
[0048] In a possible implementation, the small end of the conical surface 160 faces the first outlet 140, so that the turbid liquid after the DMC mixed liquid is allowed to settle is collected toward the first outlet 140. By opening the first control valve 141, the turbid liquid can be quickly and smoothly discharged through the first outlet 140, avoiding the turbid liquid from accumulating in the sedimentation chamber 120.
[0049] It is understandable that the inner wall of the sedimentation chamber 120 adopts the tapered surface 160, which not only optimizes the distribution and flow of the DMC mixed liquid in the sedimentation chamber 120, but also improves the discharge efficiency of the turbid liquid and the purity of the clear liquid. In addition, the tapered surface 160 also helps to reduce the dead angle and accumulation area in the sedimentation chamber 120, effectively preventing some solid particles and impurities in the DMC mixed liquid from being unable to be effectively precipitated, thereby affecting the purity of the clear liquid.
[0050] In some embodiments of the present application, the tank body 110 includes a straight cylinder body 111 and a conical cylinder body 112 connected to each other, and the inner surface of the conical cylinder body 112 forms a conical surface 160. At least one of the straight cylinder body 111 and the conical cylinder body 112 is provided with a second outlet 150. Figure 1 As shown, the tank body 110 is composed of a straight cylinder body 111 and a conical cylinder body 112, and the straight cylinder body 111 and the conical cylinder body are connected to form a whole. The inner surface of the conical cylinder body 112 forms a conical surface 160, so that the DMC mixed liquid is evenly distributed in the sedimentation chamber 120, and the turbid liquid of the DMC mixed liquid after static sedimentation is facilitated to be collected and discharged to the first outlet 140.
[0051] In one possible implementation, the second outlet 150 can be provided on the side wall of the straight cylinder 111, and can be used to discharge the clear liquid of the DMC mixed liquid from the sedimentation chamber 120 after static sedimentation, and the second outlet 150 on the side wall of the straight cylinder 111 can also be provided with a second control valve 151 for controlling the discharge of the clear liquid. In another possible implementation, the second outlet 150 can also be provided on the side wall of the conical cylinder 112, and can be used to discharge the clear liquid of the DMC mixed liquid from the sedimentation chamber 120 after static sedimentation, and the second outlet 150 on the side wall of the conical cylinder 112 can also be provided with a second control valve 151 for controlling the discharge of the clear liquid. It should be noted that the opening position of the second outlet 150 can be selected according to the actual working conditions.
[0052] In some embodiments of the present application, there are multiple second outlets 150, and the multiple second outlets 150 are arranged at intervals along the height direction of the tank body 110. Figure 1 As shown, in the example of the present application, the number of the second outlets 150 is two, but is not limited to two, and may be three or four, for example. The embodiment of the present application specifically takes two second outlets 150 as an example.
[0053] In one possible embodiment, the second outlets 150 are arranged at intervals along the height direction of the tank body 110, and the two second outlets 150 can be arranged on the side wall of the straight cylinder 111 of the tank body 110. In another possible embodiment, the second outlets 150 are arranged at intervals along the height direction of the tank body 110, one of the second outlets 150 can be arranged on the side wall of the straight cylinder 111 of the tank body 110, and the other second outlet 150 can be arranged on the side wall of the conical cylinder 112 of the tank body 110. In another possible embodiment, the second outlets 150 are arranged at intervals along the height direction of the tank body 110, and the two second outlets 150 can also be arranged on the side wall of the conical cylinder 112 of the tank body 110.
[0054] It is understandable that multiple second outlets 150 can improve the discharge efficiency of the clear liquid after the DMC mixed liquid is allowed to settle. By operating multiple second outlets 150 simultaneously, the clear liquid can be discharged from the sedimentation chamber 120 more quickly, reducing the residence time of the clear liquid in the sedimentation chamber 120, and reducing the possibility of remixing and contamination of the clear liquid and the turbid liquid. Multiple second outlets 150 arranged at intervals can also improve the separation effect of the clear liquid. The second outlet 150 close to the inlet 130 can discharge the clear liquid with less impurities, and the second outlet 150 close to the first outlet 140 can discharge the clear liquid with more impurities, thereby realizing multi-stage separation and purification of the clear liquid. The provision of multiple second outlets 150 can also improve the reliability and flexibility of the sedimentation equipment. When one or more of the second outlets 150 are blocked or fail, the other second outlets 150 can still work normally, ensuring the continuous recovery and stable operation of the clear liquid.
[0055] In some embodiments of the present application, a distillation device 200 is further included, the inlet of the distillation device 200 is connected to the first outlet 140 of the precipitation device, and the distillation device 200 is used to heat the turbid liquid to obtain gaseous DMC. Figure 2As shown, the distillation device 200 is connected to the precipitation device, and is used to heat the turbid liquid in the precipitation device to obtain gaseous DMC in the turbid liquid. The inlet of the distillation device 200 is connected to the first outlet 140 of the precipitation device, and the turbid liquid is discharged from the precipitation chamber 120 through the first outlet 140 of the precipitation device. The turbid liquid enters the distillation device 200 through the inlet of the distillation device 200 for heating treatment. The DMC component in the turbid liquid is converted from liquid to gas by heating, so that the DMC in the turbid liquid is separated and purified.
[0056] In a possible implementation, the first outlet 140 of the precipitation device can be connected to the inlet of the distillation device 200 through a pipeline, which is not described in detail here. It should be noted that the heating temperature of the distillation device 200 is 90-93° C. The heating method of the distillation device 200 can be electric heating, but is not limited to motor heating. For example, steam heating or hot oil heating can also be selected.
[0057] In some embodiments of the present application, a condensation device 300 is further included, the inlet of the condensation device 300 is connected to the outlet of the distillation device 200, and the condensation device 300 is used to condense gaseous DMC to obtain liquid DMC. Figure 2 As shown, the condensing device 300 is connected to the distillation device 200, and is used to cool down and condense the gaseous DMC in the distillation device 200 to obtain liquid DMC. The inlet of the condensing device 300 is connected to the outlet of the distillation device 200, and the gaseous DMC is discharged from the distillation device 200 through the outlet of the distillation device 200, and the gaseous DMC enters the condensing device 300 through the inlet of the condensing device 300 for cooling, condensation and recovery.
[0058] In a possible implementation, the outlet of the distillation device 200 and the inlet of the condensation device 300 can be connected by a pipeline, which is not described in detail here. It should be noted that the cooling medium in the condensation device 300 can be water or other liquid medium, and the gaseous DMC is cooled to 0°C to obtain liquid DMC with a higher concentration.
[0059] In some embodiments of the present application, a plurality of partitions (not shown in the figure) are provided in the sedimentation chamber 120 of the sedimentation device, and the partitions are used to accelerate the sedimentation of the DMC mixed solution to obtain a clear solution and a turbid solution. It is understandable that the sedimentation chamber 120 of the sedimentation device may be provided with partitions for accelerating the sedimentation of the DMC mixed solution.
[0060] In a possible implementation, the DMC mixed liquid enters the sedimentation chamber 120 through the inlet 130, and the flow path of the DMC mixed liquid can be changed through the partition in the sedimentation chamber 120, thereby increasing the contact area of the DMC mixed liquid in the sedimentation chamber 120, thereby accelerating the sedimentation of solid particles in the DMC mixed liquid and the stratification of the DMC mixed liquid.
[0061] In another possible embodiment, after the DMC mixed liquid is allowed to settle, the turbid liquid is discharged from the sedimentation chamber 120 through the first opening, or the clear liquid is discharged from the sedimentation chamber 120 through the second outlet 150. The partition in the sedimentation chamber 120 can reduce the vortex caused by the clear liquid or the turbid liquid when it is discharged from the sedimentation chamber 120, reduce the disturbance of the solid particles that have already settled, prevent the solid particles from being re-suspended, and keep the clear liquid and the turbid liquid in the sedimentation chamber 120 stable.
[0062] In some embodiments of the present application, along the height direction of the tank body 110, the lowest position of the second outlet 150 on the tank body 110 is not lower than the boundary position between the clear liquid and the turbid liquid. The boundary position is the boundary where the ratio of the clear liquid to the turbid liquid in the sedimentation chamber 120 is 8:2. It can be understood that in order to ensure that the clear liquid can be fully precipitated and separated and to avoid the turbid liquid from mixing into the second outlet 150 of the clear liquid, thereby ensuring the quality and purity of the recovered clear liquid, along the height direction of the tank body 110, the lowest position of the second outlet 150 on the tank body 110 is not lower than the boundary position between the clear liquid and the turbid liquid. It should be noted that the ratio of the boundary position can be adjusted according to the display working conditions.
[0063] Among them, the terms "upper" and "lower" are used to describe the relative position relationship of each structure in the accompanying drawings, which is only for the convenience of description and is not used to limit the scope of implementation of the present application. Changes or adjustments to their relative relationships should also be regarded as the scope of implementation of the present application without substantially changing the technical content.
[0064] It should be noted that: in this application, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0065] In addition, in this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A DMC recovery device, characterized in that: include: A precipitation device, the precipitation device comprising a tank body, the tank body having a precipitation chamber, the top of the tank body having an inlet connected to the precipitation chamber, the inlet being used to pass the DMC mixed solution recovered from the electrode cleaning device and the electrode dispersing and demoulding device into the precipitation chamber; The bottom end of the tank body has a first outlet connected to the sedimentation chamber, the first outlet is provided with a first control valve, and the first outlet is used to discharge the turbid liquid of the DMC mixed liquid after sedimentation; The side wall of the tank body is provided with a second outlet communicated with the sedimentation chamber, the second outlet is provided with a second control valve, and the second outlet is used to discharge the clear liquid of the DMC mixed liquid after sedimentation.
2. The DMC recovery device according to claim 1, characterized in that: The inner wall of the precipitation chamber close to the first outlet is in a conical surface, and the large end of the conical surface faces the inlet, and the small end of the conical surface faces the first outlet.
3. The DMC recovery device according to claim 2, characterized in that: The tank body comprises a straight cylinder body and a conical cylinder body connected to each other, and the inner surface of the conical cylinder body forms the conical surface; The second outlet is provided on at least one of the straight cylinder and the conical cylinder.
4. The DMC recovery device according to claim 3, characterized in that: There are multiple second outlets, and the multiple second outlets are arranged at intervals along the height direction of the tank body.
5. The DMC recovery device according to any one of claims 1 to 4, characterized in that: It also includes a distillation device, the inlet of the distillation device is connected to the first outlet of the precipitation device, and the distillation device is used to heat the turbid liquid to obtain gaseous DMC.
6. The DMC recovery device according to claim 5, characterized in that: The heating temperature of the distillation equipment is 90-93°C.
7. The DMC recovery device according to claim 5, characterized in that: It also includes a condensing device, the inlet of which is connected to the outlet of the distillation device, and the condensing device is used to condense the gaseous DMC to obtain liquid DMC.
8. The DMC recovery device according to any one of claims 1 to 4, characterized in that: A plurality of partitions are arranged in the sedimentation chamber of the sedimentation equipment, and the partitions are used to accelerate the sedimentation of the DMC mixed liquid to obtain the clear liquid and the turbid liquid.
9. The DMC recovery device according to any one of claims 1 to 4, characterized in that: Along the height direction of the tank body, the lowest position of the second opening on the tank body is not lower than the boundary position between the clear liquid and the turbid liquid; The boundary position is the boundary where the ratio of the clear liquid to the turbid liquid in the sedimentation chamber is 8:
2.
10. A DMC circulation system, characterized in that: include: A pole piece dispersing and demoulding device, a pole piece cleaning device, and a DMC recovery device as described in any one of claims 1 to 9, wherein the inlet of the precipitation device in the DMC recovery device is connected to the liquid outlet of the dispersing and demoulding device and the liquid outlet of the pole piece cleaning device; The second opening of the precipitation device in the DMC recovery device is connected to the liquid inlet of the dispersion demoulding device; The outlet of the condensation device in the DMC recovery device is connected to the liquid inlet of the pole piece cleaning device.