Method and device for high-value recycling of waste polyolefin diaphragm materials

Abstract

The present invention discloses a high-value recycling method for waste polyolefin diaphragm materials. The present invention also discloses a high-value recycling device for waste polyolefin diaphragm materials, including a shell, the lower end of the shell is fixedly connected to a support frame, the inner top of the shell is equipped with a feed port, the feed port is equipped with a first sealing cover, the inner bottom of the shell is equipped with a discharge port, and the discharge port is equipped with a second sealing cover; a stirring mechanism, the stirring mechanism is fixedly connected to an L-shaped plate at the upper end of the shell, the lower end of the horizontal part of the L-shaped plate is equipped with a driving motor, the output shaft of the driving motor extends to the inner wall of the shell, and is fixedly connected to a stirring shaft, and the outer side of the stirring shaft is fixedly connected with multiple stirring rods at equal intervals. In actual use, only one driving source is used with an annular electric heating plate, so the pyrolysis process can be completed, which reduces the actual production cost of the device compared to the prior art, and also facilitates the subsequent discharge operation.

Description

Technical Field

[0001] The invention relates to the field of polyolefin diaphragm recycling, and in particular to a method and device for high-value recycling of waste polyolefin diaphragm materials. Background Art

[0002] Waste polyolefin diaphragms refer to polyolefin diaphragms that are discarded or no longer used during use. Polyolefin diaphragms, referred to as "PP / PE diaphragms", are mainly made of high molecular weight polyolefin materials such as polypropylene (PP) or polyethylene (PE). They are a porous film material and are widely used in electronic fields such as lithium batteries and supercapacitors. In the existing technology, chemical recycling is often used to recycle waste polyolefin diaphragms, which can improve the recovery rate.

[0003] In chemical recycling, one of the important steps is the pyrolysis operation. The existing pyrolysis device requires multiple driving sources, resulting in a high production cost of the device. In addition, after the pyrolysis is completed, if the material is automatically discharged, the discharge speed of the material is slow and the waiting time is long, resulting in a decrease in the overall recycling efficiency. Therefore, it is necessary to consider how to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings existing in the prior art, and to propose a high-value recovery device for waste polyolefin diaphragm materials. In actual use, the recovery device only adopts one driving source with an annular electric heating plate to complete the pyrolysis process. Compared with the prior art, the actual production cost of the device is reduced. In addition, it is convenient for subsequent discharge operations.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for high-value recycling of waste polyolefin diaphragm materials comprises the following steps:

[0007] Step 1: Collect discarded polyolefin separators from battery and electronics factories;

[0008] Step 2: The polyolefin diaphragm is cleaned to remove dirt, grease and other impurities on the surface, and the cleaned polyolefin diaphragm is broken into particles or fragments for subsequent handling and processing;

[0009] Step 3: Send the crushed polyolefin diaphragm to a recovery device for pyrolysis reaction at high temperature;

[0010] Step 4: Separate the hydrocarbon gas, tar and coke produced by the reaction;

[0011] Step 5: Purify the separated substances, and then use the purified chemicals or materials to produce new plastics, synthetic rubber, and fuels.

[0012] The present invention also discloses a high-value recovery device for waste polyolefin diaphragm materials, which adopts the above-mentioned recovery method and includes a shell, the lower end of the shell is fixedly connected to a support frame, the inner top of the shell is equipped with a feed port, the feed port is equipped with a first sealing cover, the inner bottom of the shell is equipped with a discharge port, and the discharge port is equipped with a second sealing cover; a stirring mechanism, the stirring mechanism is fixedly connected to an L-shaped plate at the upper end of the shell, a drive motor is installed at the lower end of the horizontal part of the L-shaped plate, the output shaft of the drive motor extends to the inner wall of the shell and is fixedly connected to a stirring shaft, a plurality of stirring rods are fixedly connected to the outer side of the stirring shaft at equal intervals, and an annular electric heating plate is fixedly connected to the inner wall of the shell; a gas extraction mechanism, the gas extraction mechanism is used to reduce the oxygen content inside the shell, thereby promoting the pyrolysis reaction; a gas temporary storage mechanism, the gas temporary storage mechanism cooperates with the gas extraction mechanism to facilitate subsequent discharge operations.

[0013] Preferably, the inner top of the shell is connected to an exhaust pipe, and an exhaust valve is installed on the exhaust pipe.

[0014] Preferably, a connecting plate is fixedly connected to the outer side of the discharge port, a U-shaped plate is fixedly connected to one side of the connecting plate, the lower flat plate of the U-shaped plate is inclined, a guide groove is opened at the upper end of the lower flat plate of the U-shaped plate, and a plurality of separation holes are opened at the bottom of the guide groove.

[0015] Preferably, the gas extraction mechanism includes a piston cylinder installed at the upper end of the shell, a piston block that can slide left and right is arranged in the piston cylinder, a cam is installed on the outer side of the output shaft of the drive motor, the drive motor and the cam are connected through a one-way bearing, a round-headed push rod is fixedly connected to the left side of the piston block, the round-headed push rod is against the cam, and the right side of the piston block is elastically connected to the right inner wall of the piston cylinder through a first spring.

[0016] Preferably, the right side space of the piston cylinder is connected to the interior of the housing through a first one-way tube, and the right side space of the piston cylinder is connected to a second one-way tube.

[0017] Preferably, the gas temporary storage mechanism includes a gas cylinder installed on the right side of the shell, a piston plate that can slide up and down is arranged in the gas cylinder, the lower end of the piston plate is elastically connected to the inner bottom of the gas cylinder through a second spring, the inner bottom of the gas cylinder is connected to the outside through an air hole, the other end of the second one-way tube is connected to the inner top space of the gas cylinder, and the inner top space of the gas cylinder is connected to the inner top space of the shell through the release tube.

[0018] Preferably, a normally open solenoid valve is installed in the release tube, and the normally open solenoid valve and the drive motor are in the same series circuit, a first one-way valve is installed in the first one-way tube, and a second one-way valve is installed in the second one-way tube. The flow direction of the first one-way valve is from the inside of the shell to the piston cylinder in one direction, and the flow direction of the second one-way valve is from the piston cylinder to the top space in the air storage cylinder in one direction.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The well-designed coordination mechanism between the drive motor, cam and piston block realizes efficient extraction of gas inside the shell and the creation of a low-oxygen environment, providing ideal conditions for pyrolysis reactions. This innovative design not only accelerates the pyrolysis process of the diaphragm material, but also ensures that the tar, carbon and gas produced after pyrolysis can be effectively separated and recycled, greatly improving resource utilization.

[0021] 2. The release of gas in the gas cylinder is used to increase the internal air pressure of the shell, so as to achieve rapid discharge and separation of the tar and carbon mixture. This innovative technology not only improves the discharge efficiency, but also ensures the accuracy and reliability of the separation process, providing convenience for subsequent recycling and processing.

[0022] 3. During the whole process, only one driving motor is used. With this method, there is no need to use multiple driving sources, thus reducing the actual production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the high-value recycling device for waste polyolefin diaphragm materials proposed by the present invention;

[0024] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of;

[0025] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at point A;

[0026] Figure 4 for Figure 2 A schematic diagram of the enlarged structure at B;

[0027] Figure 5 It is a schematic diagram of the cross-sectional structure of the piston cylinder.

[0028] In the figure: 1 shell, 2 support frame, 3 feed port, 4 first sealing cover, 5 exhaust pipe, 6 exhaust valve, 7 air storage cylinder, 8 L-shaped plate, 9 drive motor, 10 cam, 11 piston cylinder, 12 stirring shaft, 13 stirring rod, 14 annular electric heating plate, 15 piston plate, 16 second spring, 17 air hole, 18 release tube, 19 second one-way tube, 20 normally open solenoid valve, 21 second one-way valve, 22 first one-way tube, 23 one-way bearing, 24 first spring, 25 piston block, 26 round head push rod, 27 discharge port, 28 second sealing cover, 29 connecting plate, 30 U-shaped plate, 31 guide groove, 32 first one-way valve. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] A method for high-value recycling of waste polyolefin diaphragm materials comprises the following steps:

[0032] Step 1: Collect discarded polyolefin separators from battery and electronics factories;

[0033] Step 2: The polyolefin diaphragm is cleaned to remove dirt, grease and other impurities on the surface, and the cleaned polyolefin diaphragm is broken into particles or fragments for subsequent handling and processing;

[0034] Step 3: Send the crushed polyolefin diaphragm to a recovery device for pyrolysis reaction at high temperature;

[0035] Step 4: Separate the hydrocarbon gas, tar and coke produced by the reaction;

[0036] Step 5: Purify the separated substances, and then use the purified chemicals or materials to produce new plastics, synthetic rubber, and fuels.

[0037] Reference Figure 1-Figure 5The present invention also discloses a high-value recycling device for waste polyolefin diaphragm materials, which adopts the above-mentioned recycling method and comprises a shell 1, a support frame 2 is fixedly connected to the lower end of the shell 1, a feed port 3 is installed at the inner top of the shell 1, a first sealing cover 4 is installed at the feed port 3, a discharge port 27 is installed at the inner bottom of the shell 1, a second sealing cover 28 is installed at the discharge port 27, an exhaust pipe 5 is connected to the inner top of the shell 1, and an exhaust valve 6 is installed on the exhaust pipe 5;

[0038] As an embodiment of the present invention, a connecting plate 29 is fixedly connected to the outer side of the discharge port 27, a U-shaped plate 30 is fixedly connected to one side of the connecting plate 29, the lower flat plate of the U-shaped plate 30 is inclined, a guide groove 31 is opened at the upper end of the lower flat plate of the U-shaped plate 30, and a plurality of separation holes are opened at the bottom of the guide groove 31;

[0039] As an embodiment of the present invention, it also includes a stirring mechanism, which is fixedly connected to an L-shaped plate 8 at the upper end of the shell 1, and a driving motor 9 is installed at the lower end of the horizontal part of the L-shaped plate 8. The output shaft of the driving motor 9 extends to the inner wall of the shell 1 and is fixedly connected to a stirring shaft 12. A plurality of stirring rods 13 are fixedly connected to the outer side of the stirring shaft 12 at equal intervals, and an annular electric heating plate 14 is fixedly connected to the inner wall of the shell 1.

[0040] As an embodiment of the present invention, it also includes a gas extraction mechanism, which is used to reduce the oxygen content inside the shell 1, thereby promoting the pyrolysis reaction. The gas extraction mechanism includes a piston cylinder 11 installed at the upper end of the shell 1, and a piston block 25 that can slide left and right is arranged in the piston cylinder 11. A cam 10 is installed on the outer side of the output shaft of the drive motor 9. The drive motor 9 and the cam 10 are connected through a one-way bearing 23. A round-headed push rod 26 is fixedly connected to the left side of the piston block 25, and the round-headed push rod 26 is against the cam 10. The right side of the piston block 25 is elastically connected to the right inner wall of the piston cylinder 11 through a first spring 24. The right side space of the piston cylinder 11 is connected to the inside of the shell 1 through a first one-way tube 22, and the right side space of the piston cylinder 11 is connected to the second one-way tube 19;

[0041] As an embodiment of the present invention, it also includes a gas temporary storage mechanism, which includes a gas cylinder 7 installed on the right side of the shell 1, a piston plate 15 that can slide up and down is arranged in the gas cylinder 7, the lower end of the piston plate 15 is elastically connected to the inner bottom of the gas cylinder 7 through a second spring 16, the inner bottom of the gas cylinder 7 is connected to the outside through an air hole 17, the other end of the second one-way tube 19 is connected to the inner top space of the gas cylinder 7, the inner top space of the gas cylinder 7 is connected to the inner top space of the shell 1 through the release tube 18, a normally open solenoid valve 20 is installed in the release tube 18, the normally open solenoid valve 20 and the drive motor 9 are in the same series circuit, a first one-way valve 32 is installed in the first one-way tube 22, and a second one-way valve 21 is installed in the second one-way tube 19, the flow direction of the first one-way valve 32 is one-way from the inside of the shell 1 to the piston cylinder 11, and the one-way valve flow direction of the second one-way valve 21 is one-way from the piston cylinder 11 to the top space in the gas cylinder 7.

[0042] In the present invention, when in use, the cleaned and crushed diaphragm material is put into the housing 1 from the feed port 3, and a proper amount of catalyst is added, and then the first sealing cover 4 is closed;

[0043] Start the drive motor 9 to rotate forward. The forward rotation of the drive motor 9 will rotate the cam 10 through the one-way bearing 23. By using the first spring 24, the round head push rod 26 will always resist the cam 10, so the rotation of the cam 10 will cause the round head push rod 26 and the piston block 25 to reciprocate left and right. The left and right reciprocating motion of the piston block 25 will cooperate with the use of the first one-way valve 32 and the second one-way valve 21 to generate a one-way gas flow in the top space inside the shell 1, the piston cylinder 11 and the inner top of the gas storage cylinder 7. At this time, the normally open solenoid valve 20 is powered on and closed, so the gas gathers to resist the piston plate 1. 5 moves downward and compresses the second spring 16. After a period of time, the gas inside the shell 1 is basically pumped out, and the interior is in a low-oxygen state, which meets the conditions for the pyrolysis reaction. At this time, the annular electric heating plate 14 is started, and the drive motor 9 is started to reverse. At this time, the rotation of the stirring shaft 12 will drive the broken diaphragm material to move, be heated evenly, and perform pyrolysis. At the same time, the exhaust valve 6 is opened to connect the exhaust pipe 5 with the external gas collection cylinder to facilitate the subsequent recovery of the gas. After pyrolysis, the broken diaphragm material will produce tar, carbon and gas, and the gas will be discharged to the outside through the exhaust pipe 5 and collected;

[0044] After pyrolysis is completed, the exhaust valve 6 is closed, the second sealing cover 28 is opened, and the drive motor 9 is turned off. At this time, the normally open solenoid valve 20 is powered off and opened, and the release pipe 18 is connected. The gas in the top space of the gas storage cylinder 7 will be released into the shell 1, so that the air pressure in the top space of the shell 1 increases, and the mixture of tar and carbon body is quickly pressed out from the discharge port 27, and the separation is completed at multiple separation holes to achieve recovery.

[0045] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0046] 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 according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for recovering waste polyolefin diaphragm materials in high value, characterized in that: The following steps are involved: Step 1: Collect discarded polyolefin separators from battery and electronics factories; Step 2: The polyolefin diaphragm is cleaned to remove dirt, grease and other impurities on the surface, and the cleaned polyolefin diaphragm is broken into particles or fragments for subsequent handling and processing; Step 3: Send the crushed polyolefin diaphragm to a recovery device for pyrolysis reaction at high temperature; Step 4: Separate the hydrocarbon gas, tar and coke produced by the reaction; Step 5: Purify the separated substances, and then use the purified chemicals or materials to produce new plastics, synthetic rubber, and fuels.

2. A high-value recycling device for waste polyolefin diaphragm materials, using the recycling method as claimed in claim 1, characterized in that: include: A shell (1), the lower end of the shell (1) is fixedly connected to a support frame (2), the inner top of the shell (1) is provided with a feed port (3), the feed port (3) is provided with a first sealing cover (4), the inner bottom of the shell (1) is provided with a discharge port (27), the discharge port (27) is provided with a second sealing cover (28); A stirring mechanism, the stirring mechanism being fixedly connected to an L-shaped plate (8) at the upper end of the shell (1), a driving motor (9) being mounted at the lower end of the horizontal portion of the L-shaped plate (8), an output shaft of the driving motor (9) extending to the inner wall of the shell (1) and being fixedly connected to a stirring shaft (12), a plurality of stirring rods (13) being fixedly connected to the outer side of the stirring shaft (12) at equal intervals, and an annular electric heating plate (14) being fixedly connected to the inner wall of the shell (1); A gas extraction mechanism, the gas extraction mechanism being used to reduce the oxygen content inside the housing (1), thereby promoting the pyrolysis reaction; The gas temporary storage mechanism cooperates with the gas extraction mechanism to facilitate subsequent discharge operations.

3. The high-value recovery device for waste polyolefin diaphragm materials according to claim 2 is characterized in that: The inner top of the shell (1) is connected to an exhaust pipe (5), and an exhaust valve (6) is installed on the exhaust pipe (5).

4. The high-value recovery device for waste polyolefin diaphragm materials according to claim 2 is characterized in that: A connecting plate (29) is fixedly connected to the outer side of the discharge port (27), a U-shaped plate (30) is fixedly connected to one side of the connecting plate (29), the lower flat plate of the U-shaped plate (30) is inclined, a guide groove (31) is provided at the upper end of the lower flat plate of the U-shaped plate (30), and a plurality of separation holes are provided at the bottom of the guide groove (31).

5. The high-value recovery device for waste polyolefin diaphragm materials according to claim 2 is characterized in that: The gas extraction mechanism comprises a piston cylinder (11) mounted on the upper end of a housing (1), a piston block (25) which can slide left and right is arranged in the piston cylinder (11), a cam (10) is installed on the outer side of the output shaft of the drive motor (9), the drive motor (9) and the cam (10) are connected via a one-way bearing (23), a round-headed push rod (26) is fixedly connected to the left side of the piston block (25), the round-headed push rod (26) is abutted against the cam (10), and the right side of the piston block (25) is elastically connected to the right inner wall of the piston cylinder (11) via a first spring (24).

6. The high-value recovery device for waste polyolefin diaphragm materials according to claim 5 is characterized in that: The right side space of the piston cylinder (11) is connected to the interior of the housing (1) via a first one-way tube (22), and the right side space of the piston cylinder (11) is connected to a second one-way tube (19).

7. The high-value recovery device for waste polyolefin diaphragm materials according to claim 6 is characterized in that: The gas temporary storage mechanism comprises a gas cylinder (7) installed on the right side of the housing (1), a piston plate (15) which can slide up and down is arranged in the gas cylinder (7), the lower end of the piston plate (15) is elastically connected to the inner bottom of the gas cylinder (7) through a second spring (16), the inner bottom of the gas cylinder (7) is connected to the outside through an air hole (17), the other end of the second one-way tube (19) is connected to the inner top space of the gas cylinder (7), and the inner top space of the gas cylinder (7) is connected to the inner top space of the housing (1) through the release tube (18).

8. The high-value recycling device for waste polyolefin diaphragm materials according to claim 7, characterized in that: A normally open electromagnetic valve (20) is installed in the release tube (18), and the normally open electromagnetic valve (20) and the drive motor (9) are in the same series circuit. A first one-way valve (32) is installed in the first one-way tube (22), and a second one-way valve (21) is installed in the second one-way tube (19). The flow direction of the first one-way valve (32) is one-way from the inside of the housing (1) to the piston cylinder (11), and the one-way valve flow direction of the second one-way valve (21) is one-way from the piston cylinder (11) to the top space in the gas storage cylinder (7).

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