Wet-process lithium battery diaphragm white oil extraction, drying and separation integrated equipment

Abstract

The invention discloses wet-process lithium battery diaphragm white oil extraction, drying and separation integrated equipment, and relates to the field of extraction and recovery equipment for white oil on lithium battery diaphragms, the wet-process lithium battery diaphragm white oil extraction, drying and separation integrated equipment comprises an unwinding device, an oil passing device, an extraction device, a water washing device, a drying device and a winding device which are sequentially connected through diaphragms; the system further comprises an oil-water separation device, a short steaming device and an RO water treatment device. According to the device, a novel non-volatile extracting agent is adopted to replace dichloromethane to extract white oil, so that a rectification device for recovering dichloromethane in the original equipment is omitted, and the production cost of the lithium battery diaphragm is reduced.

Description

Technical Field

[0001] The invention relates to the field of extraction and recovery equipment for white oil on lithium battery diaphragms, and in particular to integrated equipment for extraction, drying and separation of white oil from lithium battery diaphragms using a wet process. Background Art

[0002] During the production process, the polyethylene diaphragm needs to be coated with white oil on its surface, and the white oil needs to be extracted and recovered in the subsequent production process. The traditional extractant is dichloromethane, but dichloromethane has a low boiling point (39.8 degrees Celsius at normal pressure), is flammable and explosive, and has high volatility. As a result, the production process using dichloromethane as a white oil extractant cannot use a spray process to improve the white oil extraction effect. The white oil extraction effect can only be improved by extending the diaphragm immersion time or extending the length of the immersion tank, which increases the production cost of the diaphragm. In addition, in the actual production process, dichloromethane needs to be recovered by distillation separation, which further increases the production cost of the diaphragm.

[0003] Our company has invented a new ionic liquid extractant (patent number: 202310388281.1), which has the characteristics of high boiling point, low volatility, and lipophilicity and hydrophilicity. Therefore, how to design an integrated equipment for white oil extraction, drying and separation based on the characteristics of the above ionic liquid extractant to achieve low-cost production of lithium battery separators has become a difficult problem that needs to be solved urgently by technicians in this field. Summary of the invention

[0004] The purpose of the present invention is to provide an integrated device for extracting, drying and separating white oil of a wet-process lithium battery diaphragm, so as to solve the problem of high operating cost of traditional diaphragm production equipment.

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

[0006] The present invention provides an integrated device for extracting, drying and separating wet-process lithium battery diaphragm white oil, comprising an unwinding device, an oiling device, an extraction device, a washing device, a drying device and a winding device which are sequentially connected through a diaphragm;

[0007] The liquid outlet of the extraction device is sequentially connected to an oil-water separation device and a short evaporation device through a pipeline, and the liquid outlet of the short evaporation device is provided with two liquid outlets, which are respectively connected to the liquid inlet of the extraction device and the liquid inlet of the water washing device through pipelines;

[0008] The liquid outlet of the water washing device is connected to the RO water treatment device through a pipeline. The RO water treatment device is provided with two liquid outlets which are respectively connected to the liquid inlet of the water washing device and the liquid inlet of the short steam device through pipelines.

[0009] Preferably, the unwinding device comprises a first magnetic powder motor, a first air expansion shaft and a first box.

[0010] The first magnetic powder motor and the first gas expansion shaft are both installed inside the first box, the output shaft of the first magnetic powder motor is connected to the first gas expansion shaft, and the diaphragm is rolled on the first gas expansion shaft;

[0011] A plurality of rotatable passive shafts are arranged on the first housing, and one end of the diaphragm wound on the first air expansion shaft extends to the oil passing device after bypassing the passive shaft. Both ends of one of the passive shafts are connected to a first pressure sensor, which is installed on the first housing and electrically connected to the first magnetic powder motor.

[0012] Preferably, the oil-passing device comprises a second housing, a white oil tank is provided inside the second housing, two rows of staggered passive shafts are provided above the white oil tank, wherein the passive shafts in the lower row are located inside the tank body of the white oil tank, and the diaphragm extends to the extraction device after bypassing the passive shafts above the white oil tank;

[0013] The second box is closely arranged at the front end of the extraction device. White oil is stored in the white oil tank. A white oil inlet pipe and a white oil outlet pipe are connected to the tank wall of the white oil tank.

[0014] Preferably, the extraction device comprises a third housing, an extraction tank is arranged inside the third housing, a first active roller and a second active roller are arranged above the extraction tank, the first active roller is located obliquely above the left side of the second active roller, the second active roller is located inside the tank body of the extraction tank, a first flattening roller is arranged in front of the first active roller, a first passive roller is arranged behind the second active roller, a first front sprayer and a first back sprayer are arranged above the right side of the first active roller and the second active roller, respectively, a first water pump is arranged in the extraction tank, the first front sprayer and the first back sprayer are connected to the first water pump through pipelines, an ion extraction liquid is contained in the extraction tank, the first front sprayer comprises six liquid pipelines, each of which is equipped with a plurality of nozzles facing the first active roller; the first back sprayer comprises three liquid pipelines, each of which is equipped with a plurality of nozzles facing the second active roller;

[0015] The extraction tanks in the third housing are provided with three and are distributed in a front-to-back stepped manner, the horizontal height of the rear extraction tank is higher than the horizontal height of the adjacent extraction tank in the front, and a first overflow pipe is connected between every two adjacent extraction tanks;

[0016] A group of first pinch rollers arranged in an S shape are also arranged on the right side of the interior of the third box, and the diaphragm sequentially passes through the first flattening roller, the first active roller, the second active roller, the first passive roller and the first pinch roller and then extends to the water washing device;

[0017] The third boxes are provided in three numbers and are distributed in a front-to-back stepped manner, and the level of the third box at the rear is higher than the level of the third box adjacent to the front.

[0018] Preferably, the water washing device comprises a fourth box body, a water washing tank is arranged inside the fourth box body, a third active roller and a fourth active roller are arranged above the water washing tank, the third active roller is located at the upper left side of the fourth active roller, a second flattening roller is arranged in front of the third active roller, a second passive roller is arranged behind the fourth active roller, a second front sprayer and a second back sprayer are arranged on the upper right of the third active roller and the fourth active roller, respectively, a second water pump is arranged inside the water washing tank, the second front sprayer and the second back sprayer are connected to the second water pump through pipelines, the second front sprayer comprises six liquid pipelines and each liquid pipeline is equipped with a plurality of nozzles facing the third active roller, and the second back sprayer comprises three liquid pipelines and each liquid pipeline is equipped with a plurality of nozzles facing the fourth active roller;

[0019] The water washing tanks in the fourth box are provided with three and are distributed in a front-to-back stepped manner, the horizontal height of the rear water washing tank is higher than the horizontal height of the adjacent water washing tank in the front; a second overflow pipe is provided between every two adjacent water washing tanks;

[0020] A set of second pinch rollers arranged in an S shape is arranged on the right side inside the fourth box body, and the diaphragm sequentially passes around the second flattening roller, the third active roller, the fourth active roller, the second passive roller and the second pinch roller and then extends to the drying device.

[0021] Preferably, the fifth box of the drying device has a first fan and an electric heating tube installed on the top of the fifth box, and the air outside the fifth box is blown to the electric heating tube by the first fan, and is heated by the electric heating tube and then blown to the inside of the fifth box;

[0022] Two rows of passive shafts are staggered in the middle of the fifth box, and the diaphragm extends to the winding device after passing through the plurality of passive shafts in a W shape. A high-pressure air knife is also arranged in the middle of the fifth box, and the high-pressure air knife is located between the upper and lower rows of passive shafts;

[0023] A plurality of second fans are installed at the bottom of the fifth box, and the air inside the fifth box is blown toward the high-pressure air knife by the second fans, and then blown toward the diaphragm wound between the upper and lower rows of passive shafts after being rectified by the high-pressure air knife;

[0024] A control box is installed on the top wall of the fifth box body, and the control box is electrically connected to the first fan, the electric heating tube, and the second fan respectively.

[0025] Preferably, the winding device comprises a sixth box and a second air-inflating shaft; the second air-inflating shaft is rotatably connected to the inside of the sixth box, and the diaphragm is wound on the second air-inflating shaft.

[0026] Preferably, the oil-water separation device comprises a first centrifuge, a second centrifuge and a third centrifuge connected in sequence by pipelines, the first centrifuge is respectively provided with a light phase inlet, a heavy phase inlet and a heavy phase outlet, the third centrifuge is provided with a light phase outlet, the extract in the extraction device enters the oil-water separation device from the light phase inlet, water enters the oil-water separation device from the heavy phase inlet, the extract mixed with water is centrifuged in the first centrifuge, the second centrifuge and the third centrifuge to separate the heavy phase extract and the light phase white oil, the heavy phase extract is discharged from the heavy phase outlet, the light phase white oil is discharged from the light phase outlet, the heavy phase extract flows to the short steam device through a pipeline, and the light phase white oil is collected in a collection tank for standby use;

[0027] The first centrifuge, the second centrifuge and the third centrifuge are all provided with air outlets at the top and emptying ports at the bottom.

[0028] Preferably, the short steam device comprises an evaporation processor, and the evaporation processor is respectively connected to an ionic liquid recovery tank, a water recovery tank and a vacuum unit through pipelines; the heavy phase extract is heated and evaporated by heat transfer oil in the evaporation processor, and the evaporated water vapor is cooled into water after encountering the refrigerant on the top of the evaporation processor and flows to the water recovery tank through a pipeline, and the remaining extract in the evaporation processor flows to the ionic liquid recovery tank through a pipeline, and the vacuum unit is used to reduce the air pressure in the evaporation processor;

[0029] The ionic liquid recovery tank is connected to the extraction device through a pipeline, and the water recovery tank is connected to the water washing device through a pipeline.

[0030] Preferably, the RO water treatment device comprises a first stock liquid tank, a second stock liquid tank, a carbon filter tank, a folded filter, an ultrafiltration device, a TOC degrader, an ultrafiltration water storage tank, a clean water high pressure pump, an RO water purifier, and a clean water storage tank, which are sequentially connected by pipelines;

[0031] A stock liquid lifting pump is connected between the second stock liquid tank and the carbon filter tank;

[0032] The clean water storage tank is connected to the water washing device via a clean water delivery pump;

[0033] The top of the carbon filter tank, the ultrafiltration device and the RO water purifier are also connected to a concentrate water storage tank through pipelines, and the concentrate water storage tank is connected to the short steam device through a concentrate delivery pump.

[0034] Compared with the prior art, the beneficial technical effect of the present invention is as follows: in the integrated equipment for extraction, drying and separation of white oil for wet-process lithium battery diaphragm provided by the present invention, a new extractant that is not easily volatile is used to replace dichloromethane to extract the white oil, thereby eliminating the distillation device for recovering dichloromethane in the original equipment, thereby reducing the production cost of lithium battery diaphragm.

[0035] The present invention provides a sprayer in the extraction device, and sprays the extraction liquid onto the diaphragm through the sprayer, which effectively solves the problem of low white oil extraction efficiency in the method of only immersing the white oil in the extraction tank. At the same time, by providing the sprayer, the present invention effectively reduces the setting length of the extraction tank, further reducing the production cost of the lithium battery diaphragm.

[0036] The present invention realizes the function of recycling and reusing the extractant and clean water by the cooperation of the extraction device, the water washing device, the oil-water separation device, the short steam device and the RO water treatment device, and further reduces the production cost of the lithium battery separator. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described below in conjunction with the accompanying drawings.

[0038] Figure 1 This is a schematic diagram of the structure of the integrated equipment for extraction, drying and separation of white oil from wet-process lithium battery diaphragm of the present invention;

[0039] Figure 2 It is a schematic diagram of the connection relationship between the unwinding device and the oil passing device of the present invention;

[0040] Figure 3 It is a schematic diagram of the connection relationship between the extraction device and the water washing device of the present invention;

[0041] Figure 4 It is a schematic diagram of the structure of the extraction device of the present invention;

[0042] Figure 5 It is a structural schematic diagram of the drying device of the present invention;

[0043] Figure 6 It is a structural schematic diagram of the winding device of the present invention;

[0044] Figure 7 This is a schematic diagram of the structure of the oil-water separation device of the present invention;

[0045] Figure 8 It is a schematic diagram of the structure of the short steaming device of the present invention;

[0046] Fig. 9 It is a schematic diagram of the structure of the RO water treatment device of the present invention.

[0047] Description of reference numerals: 1. unwinding device; 2. oiling device; 3. extraction device; 4. water washing device; 5. drying device; 6. winding device; 7. oil-water separation device; 8. short steaming device; 9. RO water treatment device;

[0048] 101, a first magnetic powder motor; 102, a first air expansion shaft; 103, a first box; 104, a first pressure sensor;

[0049] 201, second box; 202, white oil tank;

[0050] 301, third box; 302, extraction tank; 303, first active roller; 304, second active roller; 305, first flattening roller; 306, first passive roller; 307, first front sprayer; 308, first back sprayer; 309, first water pump; 310, first overflow pipe; 311, first pinch roller;

[0051] 401, fourth box; 402, washing tank; 403, third active roller; 404, fourth active roller; 405, second flattening roller; 406, second passive roller; 407, second front sprayer; 408, second back sprayer; 409, second water pump; 410, second overflow pipe; 411, second pinch roller;

[0052] 501, fifth box; 502, first fan; 503, electric heating tube; 504, high-pressure air knife; 505, second fan; 506, control box;

[0053] 601, sixth box; 602, second air expansion shaft;

[0054] 701, first centrifuge; 702, second centrifuge; 703, third centrifuge; 711, light phase inlet; 712, heavy phase inlet; 713, heavy phase outlet; 731, light phase outlet;

[0055] 801, evaporation processor; 802, ionic liquid recovery tank; 803, water recovery tank; 804, vacuum unit;

[0056] 901. First raw liquid tank; 902. Second raw liquid tank; 903. Raw liquid lifting pump; 904. Carbon filter tank; 905. Pleated filter; 906. Ultrafiltration equipment; 907. TOC degrader; 908. Ultrafiltration water storage tank; 909. Clean water high-pressure pump; 9010. RO water purifier; 9011. Clean water storage tank; 9012. Clean water delivery pump; 9013. Concentrate storage tank; 9014. Concentrate delivery pump. DETAILED DESCRIPTION

[0057] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0058] like Figure 1-9 As shown, a wet-process lithium battery diaphragm white oil extraction, drying and separation integrated equipment includes an unwinding device 1, an oil passing device 2, an extraction device 3, a water washing device 4, a drying device 5 and a winding device 6 which are sequentially connected through a diaphragm;

[0059] The liquid outlet of the extraction device 3 is connected to the oil-water separation device 7 and the short evaporation device 8 in sequence through pipelines. The short evaporation device 8 has two liquid outlets which are respectively connected to the liquid inlet of the extraction device 3 and the liquid inlet of the water washing device 4 through pipelines.

[0060] The liquid outlet of the water washing device 4 is connected to the RO water treatment device 9 through a pipeline. The RO water treatment device 9 is provided with two liquid outlets which are respectively connected to the liquid inlet of the water washing device 4 and the liquid inlet of the short steam device 8 through pipelines.

[0061] Specifically, the unwinding device 1 includes a first magnetic powder motor 101, a first air expansion shaft 102 and a first box 103.

[0062] The first magnetic powder motor 101 and the first gas expansion shaft 102 are both installed inside the first box 103, the output shaft of the first magnetic powder motor 101 is connected to the first gas expansion shaft 102, and the diaphragm is rolled on the first gas expansion shaft 102;

[0063] A plurality of rotatable passive shafts are provided on the first box body 103, and one end of the diaphragm wound on the first air expansion shaft 102 extends to the oil passing device 2 after bypassing the passive shaft. Both ends of one of the passive shafts are connected to a first pressure sensor 104, which is installed on the first box body 103 and electrically connected to the first magnetic powder motor 101.

[0064] Specifically, the oil-passing device 2 includes a second box body 201, a white oil tank 202 is disposed inside the second box body 201, two rows of staggered passive shafts are disposed above the white oil tank 202, wherein the passive shafts in the lower row are located inside the tank body of the white oil tank 202, and the diaphragm extends to the extraction device 3 after bypassing the passive shafts above the white oil tank 202;

[0065] The second box body 201 is closely arranged at the front end of the extraction device 3 . The white oil tank 202 stores white oil. The tank wall of the white oil tank 202 is connected with a white oil inlet pipe and a white oil outlet pipe.

[0066] Specifically, the extraction device 3 includes a third housing 301, an extraction tank 302 is disposed inside the third housing 301, a first active roller 303 and a second active roller 304 are disposed above the extraction tank 302, the first active roller 303 is located obliquely above the left side of the second active roller 304, the second active roller 304 is located inside the tank body of the extraction tank 302, a first flattening roller 305 is disposed in front of the first active roller 303, a first passive roller 306 is disposed behind the second active roller 304, and the first active roller 303 and the second active roller 304 are disposed at the upper right corners of the first active roller 303 and the second active roller 304. A first front sprayer 307 and a first back sprayer 308 are respectively provided, a first water pump 309 is provided in the extraction tank 302, the first front sprayer 307 and the first back sprayer 308 are connected to the first water pump 309 through pipelines, and ion extraction liquid is contained in the extraction tank 302, the first front sprayer 307 includes six liquid pipelines, each of which is equipped with a plurality of nozzles facing the first active roller 303; the first back sprayer 308 includes three liquid pipelines, each of which is equipped with a plurality of nozzles facing the second active roller 304;

[0067] The extraction tanks 302 in the third housing 301 are provided with three and are distributed in a front-to-back stepped manner. The horizontal height of the rear extraction tank 302 is higher than the horizontal height of the adjacent extraction tank 302 in the front. A first overflow pipe 310 is connected between every two adjacent extraction tanks 302.

[0068] A group of first pinch rollers 311 arranged in an S shape are also arranged on the right side of the third box body 301, and the diaphragm sequentially passes through the first flattening roller 305, the first active roller 303, the second active roller 304, the first passive roller 306 and the first pinch roller 311 and then extends to the washing device 4;

[0069] The third boxes 301 are provided in three numbers and are distributed in a front-to-back stepped manner, and the level of the third boxes 301 at the rear is higher than the level of the third boxes 301 adjacent to the front.

[0070] Specifically, the washing device 4 includes a fourth box body 401, a washing tank 402 is arranged inside the fourth box body 401, a third active roller 403 and a fourth active roller 404 are arranged above the washing tank 402, the third active roller 403 is located on the left side of the fourth active roller 404, a second flattening roller 405 is arranged in front of the third active roller 403, a second passive roller 406 is arranged behind the fourth active roller 404, and the third active roller 403 and the fourth active roller 404 are respectively arranged on the upper right side. A second front sprayer 407 and a second back sprayer 408, a second water pump 409 is arranged inside the water washing tank 402, the second front sprayer 407 and the second back sprayer 408 are connected to the second water pump 409 through pipelines, the second front sprayer 407 includes six liquid pipelines and each liquid pipeline is equipped with a plurality of nozzles facing the third active roller 403, and the second back sprayer 408 includes three liquid pipelines and each liquid pipeline is equipped with a plurality of nozzles facing the fourth active roller 404;

[0071] The water washing tanks 402 in the fourth box 401 are provided with three and are distributed in a front-to-back stepped manner, and the level of the rear water washing tank 402 is higher than the level of the front adjacent water washing tank 402; a second overflow pipe 410 is provided between every two adjacent water washing tanks 402;

[0072] A set of second pinching rollers 411 arranged in an S shape is arranged on the right side inside the fourth box body 401, and the diaphragm sequentially passes through the second flattening roller 405, the third active roller 403, the fourth active roller 404, the second passive roller 406 and the second pinching roller 411 and then extends to the drying device 5.

[0073] The volume of the water washing tank 402 is smaller than that of the extraction tank 302, so as to increase the circulation rate of water between the water washing tank 402 and the second front sprayer 407 and the second back sprayer 408, thereby improving the water washing effect.

[0074] Among them, the white oil tank 202, the extraction tank 302 and the water washing tank 402 are all connected to a liquid storage tank through a pipeline, and the liquid storage tank is respectively located outside the second box body 201, the third box body 301 and the fourth box body 401, so that the staff can extract liquid from the liquid storage tank and test the extracted liquid to determine whether there is a fault in the oil passing, extraction and water washing device.

[0075] Among them, a central control screen is installed on the outer wall of the extraction device 3, and an electric valve is installed on the pipeline connected to the first water pump 309 and the second water pump 409. The electric valve is electrically connected to the central control screen, and the first water pump 309 and the second water pump 409 are electrically connected to the central control screen. The first water pump 309, the second water pump 409 and the electric valve are controlled by the central control screen to control the operation of the first front sprayer 307, the first back sprayer 308, the second front sprayer 407, and the second back sprayer 408. The spraying operation.

[0076] Among them, after the diaphragm is sprayed, the tension on the surface of the diaphragm will change, which will cause the diaphragm to wrinkle, making it difficult to extract the white oil in the wrinkled part of the diaphragm. At this time, the first flattening roller 305 arranged at the front end of the first active roller 303 will flatten the diaphragm through axial tension to ensure that the white oil on the surface of the diaphragm is fully extracted.

[0077] Specifically, the fifth box 501 of the drying device 5 has a first fan 502 and an electric heating tube 503 installed on the top of the fifth box 501. The air outside the fifth box 501 is blown toward the electric heating tube 503 by the first fan 502, and then blown toward the inside of the fifth box 501 after being heated by the electric heating tube 503.

[0078] Two rows of passive shafts are staggered in the middle of the fifth box 501, and the diaphragm is extended to the winding device 6 after passing through the plurality of passive shafts in a W shape. A high-pressure air knife 504 is also arranged in the middle of the fifth box 501, and the high-pressure air knife 504 is located between the upper and lower rows of passive shafts.

[0079] A plurality of second fans 505 are installed at the bottom of the fifth box 501, and the air inside the fifth box 501 is blown toward the high-pressure air knife 504 by the second fans 505, and then blown toward the diaphragm wound between the upper and lower rows of passive shafts after being rectified by the high-pressure air knife 504;

[0080] A control box 506 is installed on the top wall of the fifth box body 501 , and the control box 506 is electrically connected to the first fan 502 , the electric heating tube 503 , and the second fan 505 , respectively.

[0081] Specifically, the winding device 6 includes a sixth box body 601 and a second air-inflating shaft 602 ; the second air-inflating shaft 602 is rotatably connected to the inside of the sixth box body 601 , and the diaphragm is wound on the second air-inflating shaft 602 .

[0082] In a specific implementation, both ends of the second air-expanding shaft 602 are connected to servo motors, and the servo motors are installed on the sixth box 601 . The second air-expanding shaft 602 moves back and forth between the two servo motors under the control of the servo motors.

[0083] The diaphragm may deviate during the winding process and no longer be wound in the middle position of the second air expansion shaft 602. At this time, the diaphragm can be rewound in the middle position of the second air expansion shaft 602 by controlling the servo motor to adjust the position of the second air expansion shaft 602. The setting of the servo motor solves the problem of easy deviation of the diaphragm during the winding process.

[0084] Specifically, the oil-water separation device 7 includes a first centrifuge 701, a second centrifuge 702 and a third centrifuge 703 which are connected in sequence through pipelines. The first centrifuge 701 is respectively provided with a light phase inlet 711, a heavy phase inlet 712 and a heavy phase outlet 713. The third centrifuge 703 is provided with a light phase outlet 731. The extract in the extraction device 3 enters the oil-water separation device 7 from the light phase inlet 711, and water enters the oil-water separation device 7 from the heavy phase inlet 712. The extract mixed with water is centrifuged in the first centrifuge 701, the second centrifuge 702 and the third centrifuge 703 to separate the heavy phase extract and the light phase white oil. The heavy phase extract is discharged from the heavy phase outlet 713, and the light phase white oil is discharged from the light phase outlet 731. The heavy phase extract flows to the short steam device 8 through a pipeline, and the light phase white oil is collected in a collection tank for standby use.

[0085] The first centrifuge 701, the second centrifuge 702 and the third centrifuge 703 are all provided with air outlets at the top and emptying ports at the bottom.

[0086] Specifically, the short evaporation device 8 includes an evaporation processor 801, and the evaporation processor 801 is respectively connected to an ionic liquid recovery tank 802, a water recovery tank 803 and a vacuum unit 804 through pipelines; the heavy phase extract is heated and evaporated by heat transfer oil in the evaporation processor 801, and the evaporated water vapor is cooled into water after encountering the refrigerant on the top of the evaporation processor 801 and flows to the water recovery tank 803 through a pipeline, and the remaining extract in the evaporation processor 801 flows to the ionic liquid recovery tank 802 through a pipeline, and the vacuum unit 804 is used to reduce the air pressure in the evaporation processor 801;

[0087] The ionic liquid recovery tank 802 is connected to the extraction device through a pipeline, and the water recovery tank 803 is connected to the water washing device 4 through a pipeline.

[0088] Specifically, the RO water treatment device 9 includes a first raw liquid tank 901, a second raw liquid tank 902, a carbon filter tank 904, a folded filter 905, an ultrafiltration device 906, a TOC degrader 907, an ultrafiltration water storage tank 908, a clean water high pressure pump 909, an RO water purifier 9010, and a clean water storage tank 9011, which are sequentially connected by pipelines;

[0089] A raw liquid lifting pump 903 is connected between the second raw liquid tank 902 and the carbon filter tank 904;

[0090] The clean water storage tank 9011 is connected to the water washing device 4 via a clean water delivery pump 9012;

[0091] The top of the carbon filter tank 904 , the ultrafiltration device 906 and the RO water purifier 9010 are also connected to a concentrate water storage tank 9013 through pipelines, and the concentrate water storage tank 9013 is connected to the short steam device 8 through a concentrate delivery pump 9014 .

[0092] Specifically, the device is also suitable for extracting and separating ultra-high molecular weight polyethylene fibers.

[0093] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0094] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A wet process lithium battery diaphragm white oil extraction, drying and separation integrated equipment, characterized in that: It comprises an unwinding device (1), an oiling device (2), an extraction device (3), a water washing device (4), a drying device (5) and a winding device (6) which are sequentially connected via a diaphragm; The liquid outlet of the extraction device (3) is connected to an oil-water separation device (7) and a short evaporation device (8) in sequence through pipelines; the short evaporation device (8) is provided with two liquid outlets, which are respectively connected to the liquid inlet of the extraction device (3) and the liquid inlet of the water washing device (4) through pipelines; The liquid outlet of the water washing device (4) is connected to the RO water treatment device (9) via a pipeline, and the RO water treatment device (9) is provided with two liquid outlets which are respectively connected to the liquid inlet of the water washing device (4) and the liquid inlet of the short steam device (8) via pipelines.

2. The wet process lithium battery diaphragm white oil extraction, drying and separation integrated equipment according to claim 1, characterized in that: The unwinding device (1) comprises a first magnetic powder motor (101), a first air expansion shaft (102) and a first box (103). The first magnetic powder motor (101) and the first air expansion shaft (102) are both installed inside the first box (103); the output shaft of the first magnetic powder motor (101) is connected to the first air expansion shaft (102); and the diaphragm is rolled onto the first air expansion shaft (102); A plurality of rotatable passive shafts are arranged on the first housing (103); one end of the diaphragm wound on the first air expansion shaft (102) extends to the oil passing device (2) after passing around the passive shaft; two ends of one of the passive shafts are connected to a first pressure sensor (104); the first pressure sensor (104) is mounted on the first housing (103) and is electrically connected to the first magnetic powder motor (101).

3. The wet process lithium battery diaphragm white oil extraction, drying and separation integrated equipment according to claim 1, characterized in that: The oil-passing device (2) comprises a second housing (201), a white oil tank (202) is arranged inside the second housing (201), two rows of staggered passive shafts are arranged above the white oil tank (202), wherein the passive shafts in the lower row are located inside the tank body of the white oil tank (202), and the diaphragm extends to the extraction device (3) after bypassing the passive shafts above the white oil tank (202); The second housing (201) is closely arranged at the front end of the extraction device (3); white oil is stored in the white oil tank (202); and a white oil inlet pipe and a white oil outlet pipe are connected to the tank wall of the white oil tank (202).

4. The wet process lithium battery diaphragm white oil extraction, drying and separation integrated equipment according to claim 1, characterized in that: The extraction device (3) comprises a third housing (301), an extraction tank (302) is arranged inside the third housing (301), a first active roller (303) and a second active roller (304) are arranged above the extraction tank (302), the first active roller (303) is located obliquely above the left side of the second active roller (304), the second active roller (304) is located inside the tank body of the extraction tank (302), a first flattening roller (305) is arranged in front of the first active roller (303), a first passive roller (306) is arranged behind the second active roller (304), the first active roller (303) and the second active roller (304) are arranged on the right side of the first active roller (303) and the second active roller (304). A first front sprayer (307) and a first back sprayer (308) are respectively arranged on the top, a first water pump (309) is arranged in the extraction tank (302), the first front sprayer (307) and the first back sprayer (308) are both connected to the first water pump (309) through pipelines, an ion extraction liquid is contained in the extraction tank (302), the first front sprayer (307) includes six liquid pipelines, each of which is equipped with a plurality of nozzles facing the first active roller (303); the first back sprayer (308) includes three liquid pipelines, each of which is equipped with a plurality of nozzles facing the second active roller (304); The extraction tanks (302) in the third housing (301) are provided with three and are distributed in a front-to-back stepped manner, the horizontal height of the extraction tank (302) at the rear is higher than the horizontal height of the adjacent extraction tank (302) at the front, and a first overflow pipe (310) is connected between every two adjacent extraction tanks (302); A group of first pinch rollers (311) arranged in an S shape are also arranged on the right side inside the third box body (301), and the diaphragm sequentially passes around the first flattening roller (305), the first active roller (303), the second active roller (304), the first passive roller (306) and the first pinch roller (311) and then extends to the water washing device (4); The third boxes (301) are provided in three numbers and are distributed in a front-to-back stepped manner, and the horizontal height of the third box (301) at the rear is higher than the horizontal height of the third box (301) adjacent to the front.

5. The wet process lithium battery diaphragm white oil extraction, drying and separation integrated equipment according to claim 1, characterized in that: The water washing device (4) comprises a fourth housing (401), a water washing tank (402) is arranged inside the fourth housing (401), a third active roller (403) and a fourth active roller (404) are arranged above the water washing tank (402), the third active roller (403) is located obliquely above the left side of the fourth active roller (404), a second flattening roller (405) is arranged in front of the third active roller (403), a second passive roller (406) is arranged behind the fourth active roller (404), and a second active roller (406) is arranged above the third active roller (403) and the fourth active roller (404) respectively. A second front sprayer (407) and a second back sprayer (408) are arranged, a second water pump (409) is arranged inside the water washing tank (402), the second front sprayer (407) and the second back sprayer (408) are connected to the second water pump (409) through pipelines, the second front sprayer (407) includes six liquid pipelines and each liquid pipeline is equipped with a plurality of nozzles facing the third active roller (403), and the second back sprayer (408) includes three liquid pipelines and each liquid pipeline is equipped with a plurality of nozzles facing the fourth active roller (404); The water washing tanks (402) in the fourth box (401) are provided with three and are distributed in a front-to-back stepped manner, and the horizontal height of the water washing tank (402) at the rear is higher than the horizontal height of the adjacent water washing tank (402) at the front; a second overflow pipe (410) is provided between every two adjacent water washing tanks (402); A group of second pinch rollers (411) arranged in an S shape are arranged on the right side inside the fourth box body (401), and the diaphragm successively passes around the second flattening roller (405), the third active roller (403), the fourth active roller (404), the second passive roller (406) and the second pinch roller (411) and then extends to the drying device (5).

6. The wet process lithium battery diaphragm white oil extraction, drying and separation integrated equipment according to claim 1, characterized in that: The drying device (5) has a fifth box (501), a first fan (502) and an electric heating tube (503) being installed on the top of the fifth box (501), and air outside the fifth box (501) is blown toward the electric heating tube (503) by the first fan (502), and is heated by the electric heating tube (503) and then blown toward the inside of the fifth box (501); Two rows of passive shafts are staggered in the middle of the fifth box (501), and the diaphragm extends to the winding device (6) after passing through the plurality of passive shafts in a W shape. A high-pressure air knife (504) is also arranged in the middle of the fifth box (501), and the high-pressure air knife (504) is located between the upper and lower rows of passive shafts; A plurality of second fans (505) are installed at the bottom of the fifth box (501), and the air inside the fifth box (501) is blown toward the high-pressure air knife (504) by the second fans (505), and then blown toward the diaphragm wound between the upper and lower rows of passive shafts after being rectified by the high-pressure air knife (504); A control box (506) is installed on the top wall of the fifth box body (501), and the control box (506) is electrically connected to the first fan (502), the electric heating tube (503), and the second fan (505), respectively.

7. The wet process lithium battery diaphragm white oil extraction, drying and separation integrated equipment according to claim 1, characterized in that: The winding device (6) comprises a sixth box (601) and a second air-inflating shaft (602); the second air-inflating shaft (602) is rotatably connected to the inside of the sixth box (601), and the diaphragm is wound on the second air-inflating shaft (602).

8. The wet process lithium battery diaphragm white oil extraction, drying and separation integrated equipment according to claim 1, characterized in that: The oil-water separation device (7) comprises a first centrifuge (701), a second centrifuge (702) and a third centrifuge (703) which are connected in sequence by pipelines. The first centrifuge (701) is provided with a light phase inlet (711), a heavy phase inlet (712) and a heavy phase outlet (713), respectively. The third centrifuge (703) is provided with a light phase outlet (731). The extract in the extraction device (3) enters the oil-water separation device (7) from the light phase inlet (711), and the water enters the oil-water separation device (7) from the light phase inlet (712). The heavy phase inlet (712) enters the oil-water separation device (7), and the extract mixed with water is centrifuged in the first centrifuge (701), the second centrifuge (702) and the third centrifuge (703) to separate the heavy phase extract and the light phase white oil. The heavy phase extract is discharged from the heavy phase outlet (713), and the light phase white oil is discharged from the light phase outlet (731). The heavy phase extract flows to the short steam device (8) through a pipeline, and the light phase white oil is collected in a collection tank for standby use. The first centrifuge (701), the second centrifuge (702) and the third centrifuge (703) are all provided with air outlets at the top and emptying ports at the bottom.

9. The wet process lithium battery diaphragm white oil extraction, drying and separation integrated equipment according to claim 8, characterized in that: The short evaporation device (8) comprises an evaporation processor (801), and the evaporation processor (801) is respectively connected to an ion liquid recovery tank (802), a water recovery tank (803) and a vacuum unit (804) through pipelines; the heavy phase extract is heated and evaporated by heat transfer oil in the evaporation processor (801), and the evaporated water vapor encounters the refrigerant on the top of the evaporation processor (801) and is cooled into water and flows to the water recovery tank (803) through a pipeline, and the remaining extract in the evaporation processor (801) flows to the ion liquid recovery tank (802) through a pipeline, and the vacuum unit (804) is used to reduce the air pressure in the evaporation processor (801); The ionic liquid recovery tank (802) is connected to the extraction device via a pipeline, and the water recovery tank (803) is connected to the water washing device (4) via a pipeline.

10. The wet process lithium battery diaphragm white oil extraction, drying and separation integrated equipment according to claim 1, characterized in that: The RO water treatment device (9) comprises a first raw liquid tank (901), a second raw liquid tank (902), a carbon filter tank (904), a folded filter (905), an ultrafiltration device (906), a TOC degrader (907), an ultrafiltration water storage tank (908), a clean water high pressure pump (909), an RO water purifier (9010), and a clean water storage tank (9011) which are sequentially connected via pipelines; A raw liquid lifting pump (903) is connected between the second raw liquid tank (902) and the carbon filter tank (904); The clean water storage tank (9011) is connected to the water washing device (4) via a clean water delivery pump (9012); The top of the carbon filter tank (904), the ultrafiltration device (906) and the RO water purifier (9010) are also connected to a concentrate water storage tank (9013) through pipelines, and the concentrate water storage tank (9013) is connected to the short steam device (8) through a concentrate delivery pump (9014).

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