A metal extraction device for a photovoltaic cell

Abstract

The application provides a metal extraction device for a photovoltaic cell, which comprises an acid pickling tank, a first filtering tank and a second filtering tank, the upper opening of the acid pickling tank is sealingly connected with a top cover which can be opened and closed, the acid pickling tank is provided with a first heating device, a first ultrasonic oscillation device and a pH meter; the liquid inlet of the first filtering tank is connected with the liquid outlet of the acid pickling tank through a first pipeline, and the first filtering tank is provided with a first filtering device; the liquid inlet of the second filtering tank is connected with the liquid outlet of the first filtering tank through a second pipeline, and the second filtering tank is provided with a second filtering device; and the liquid outlet of the second filtering tank is connected with the liquid inlet of the acid pickling tank through a third pipeline. The application provides an extraction device for the metal extraction process of the photovoltaic cell, and the silver element and the copper element in the photovoltaic cell can be extracted through the precipitation mode and recycled.

Description

Technical Field

[0001] This invention relates to the field of metal extraction technology, and more particularly to a metal extraction device for photovoltaic cells. Background Technology

[0002] Photovoltaic modules, composed of multiple individual solar cells connected in series and parallel and encapsulated, are the core component of solar power plants. The structure of a photovoltaic module includes encapsulating glass, EVA film, solar cells, and a backsheet. Crystalline silicon photovoltaic modules have a lifespan of approximately 25 years. After the entire photovoltaic panel is scrapped, it requires harmless treatment and resource recycling. Currently, there are several methods, including heat treatment, organic solvent treatment, and laser cutting, to completely separate the encapsulating glass and backsheet, thereby extracting the photovoltaic cells. The cells contain metals such as silver and copper; if these could be extracted, they could be sold as byproducts. Currently, there is no equipment available for extracting silver and copper from photovoltaic cells. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art. To this end, embodiments of the present invention provide a metal extraction device for photovoltaic cells, which can extract and recycle silver and copper elements in photovoltaic cells.

[0004] This invention provides a metal extraction device for photovoltaic cells, comprising: an acid washing tank, a first filtration tank, and a second filtration tank. The acid washing tank has an acid washing chamber and an upper opening, an inlet, and an outlet connecting to the acid washing chamber. The upper opening of the acid washing tank is openable and sealed with a top cover. The acid washing tank is equipped with a first heating device, a first ultrasonic vibration device, and a pH meter. The first filtration tank has a first filtration chamber and an upper opening, an inlet, and an outlet connecting to the first filtration chamber. The inlet of the first filtration tank is connected to the outlet of the acid washing tank via a first pipeline. The first filtration tank is equipped with a first filtration device. The second filtration tank has a second filtration chamber and an upper opening, an inlet, and an outlet connecting to the second filtration chamber. The inlet of the second filtration tank is connected to the outlet of the first filtration tank via a second pipeline. The second filtration tank is equipped with a second filtration device. The outlet of the second filtration tank is connected to the inlet of the acid washing tank via a third pipeline.

[0005] This invention, by setting up an acid washing tank, a first filtration tank, and a second filtration tank, can extract and recycle silver and copper elements from photovoltaic cells through precipitation. By connecting the outlet of the second filtration tank to the inlet of the acid washing tank, the filtrate from the second filtration tank can be transported to the acid washing tank for recycling.

[0006] In some embodiments, the top cover is provided with an exhaust port, which is connected to an exhaust gas treatment device via an exhaust gas pipe. By providing the top cover, the exhaust gas generated in the pickling tank can be prevented from overflowing and polluting the air. By connecting the exhaust port on the top cover to the exhaust gas treatment device, the generated exhaust gas can be treated, preventing air pollution.

[0007] In some embodiments, the pickling chamber is equipped with a filter tank for holding the battery cells, and the bottom and side walls of the filter tank are evenly distributed with a plurality of filter holes. By setting up the filter tank, it is convenient to pick up and put down the battery cells and replace the pickled battery cells. On the other hand, it allows silver and copper elements to flow into the pickling chamber from the filter tank in the form of a solution, which is convenient for subsequent extraction, while preventing impurities from the battery cells from entering the pickling chamber.

[0008] In some embodiments, support legs are fixedly connected to the four corners of the bottom of the filter tank, and a gap is left between the outer wall of the filter tank and the pickling tank. This allows silver and copper elements to flow from the filter tank into the gap between the filter tank and the pickling tank in the form of a solution.

[0009] In some embodiments, a lifting point is fixedly connected to the upper edge of the filter tank, and the filter tank enters and exits the pickling tank through the upper opening of the pickling tank. This facilitates lifting the filter tank, replacing the battery cells in the filter tank, or replacing the filter tank and battery cells as a whole, and prevents operators from directly contacting the filter tank after it has been soaked in acid, thus avoiding injury.

[0010] In some embodiments, the first filtration device includes: a first filter plate and a first sealing door. The first filter plate is retractably connected to a first filtration chamber. The inner sidewall of the first filtration chamber is provided with a first slide rail arranged horizontally. The first slide rail slides in cooperation with the side of the first filter plate. The first filter plate is located near the bottom of the first filtration chamber. The inlet of the first filtration tank is located on the upper part of the sidewall of the first filtration chamber and above the first filter plate. The outlet of the first filtration tank is located in the gap between the first filter plate and the bottom plate of the first filtration chamber. The outlet of the first filtration tank is connected to a first filter screen, which is located inside the first filtration chamber. The first sealing door is fixedly connected to the pull-out end of the first filter plate. The sidewall of the first filtration tank has a first pull-out opening. The first sealing door is openable and closable and sealed to the first pull-out opening. The first sealing door is fixedly connected to a first handle. The second filtration device has the same structure as the first filtration device. This facilitates the collection of product sedimentation.

[0011] In some embodiments, the first filter tank is externally connected to a first receiving groove, which is located outside the first sealing door. The first filter plate is pulled within the range of the first receiving groove, and the first sealing door remains within the first receiving groove after being pulled outwards. Similarly, the second filter tank is externally connected to a second receiving groove, which is located outside the second sealing door. The second filter plate is pulled within the range of the second receiving groove, and the second sealing door remains within the second receiving groove after being pulled outwards. By providing the receiving groove, liquid remaining on the filter plate after it is pulled out can be prevented from falling directly onto the ground or workbench, causing contamination or acidic corrosion to the ground or workbench.

[0012] In some embodiments, the first filtration tank is equipped with a second heating device and a second ultrasonic vibration device, and the second filtration tank is equipped with a third heating device and a third ultrasonic vibration device. This can promote the reaction process, make the solution mix evenly, and make the silver and copper elements in the extract form precipitates more completely.

[0013] In some embodiments, a first spraying device is connected to the first receiving tank, which sprays water onto the first filter plate pulled outward; a second spraying device is connected to the second receiving tank, which sprays water onto the second filter plate pulled outward; the first and second spraying devices are connected to a common inlet pipe. This facilitates the cleaning of the filter plates and the liquid adhering to the sediment.

[0014] In some embodiments, the first spraying device includes: a first spray pipe and a first support frame. The first spray pipe is closely attached to the outer wall of the first filter tank and is arranged horizontally. A plurality of first nozzles are evenly distributed below the first spray pipe, and the first nozzles spray vertically downwards onto the first filter plate. The first spray pipe is connected to an inlet pipe. The first support frame is fixedly connected between the first spray pipe and the first receiving groove, and is connected to both ends of the first spray pipe. The second spraying device has the same structure as the first spraying device. This makes the spraying of the filter plate and sediment more uniform. Attached Figure Description

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings.

[0016] in:

[0017] Figure 1 This is a top-view structural schematic diagram of the metal extraction device for photovoltaic cells in an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A schematic diagram of the filter tank structure;

[0019] Figure 3This is a frontal view of the metal extraction device for photovoltaic cells in an embodiment of the present invention.

[0020] Figure 4 This is a rear-view structural schematic diagram of the metal extraction device for photovoltaic cells in an embodiment of the present invention;

[0021] Figure label:

[0022] 1-Top cover; 2-Exhaust port; 3-Acid washing tank; 4-Filter tank; 41-Hanging point; 42-Support leg; 43-Filter hole; 5-Third pipeline; 6-First filter tank; 7-Second filter tank; 8-Second pipeline; 9-Second filter plate; 10-Inlet pipe; 11-First pipeline; 12-First spray pipe; 13-First support frame; 14-First filter plate; 15-First sealing door; 16-First receiving groove. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] The metal extraction apparatus for photovoltaic cells according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0025] like Figure 1-4 As shown in the figure, an embodiment of the present invention proposes a metal extraction device for photovoltaic cells, comprising: an acid washing tank 3, a first filter tank 6, and a second filter tank 7. The acid washing tank 3 has an acid washing chamber and an upper opening, an inlet, and an outlet connecting the acid washing chamber. The upper opening of the acid washing tank 3 is openable and sealed with a top cover 1. The acid washing tank 3 is equipped with a first heating device, a first ultrasonic vibration device, and a pH meter. The first filter tank 6 has a first filter chamber and an upper opening, an inlet, and an outlet connecting the first filter chamber. The inlet of the first filter tank 6 is connected to the outlet of the acid washing tank 3 through a first pipeline 11. The first filter tank 6 is equipped with a first filter device. The second filter tank 7 has a second filter chamber and an upper opening, an inlet, and an outlet connecting the second filter chamber. The inlet of the second filter tank 7 is connected to the outlet of the first filter tank 6 through a second pipeline 8. The second filter tank 7 is equipped with a second filter device. The outlet of the second filter tank 7 is connected to the inlet of the acid washing tank 3 through a third pipeline 5.

[0026] This invention, by setting up an acid washing tank 3, a first filter tank 6, and a second filter tank 7, can extract and recycle silver and copper elements from photovoltaic cells through precipitation. By connecting the outlet of the second filter tank 7 to the inlet of the acid washing tank 3, the filtrate from the second filter tank 7 can be transported to the acid washing tank 3 for recycling.

[0027] Furthermore, the pH value in the pickling tank 3 is monitored by a pH meter and needs to be maintained between 2 and 5. Since the filtrate in the second filter tank 7 needs to be fed into the pickling tank 3 for reuse, it will dilute the acid in the pickling tank 3. When the pH value in the pickling tank 3 is greater than 5, acid needs to be added to the pickling tank 3 in a timely manner.

[0028] Furthermore, a first pump body is connected to the first pipeline 11, a second pump body is connected to the second pipeline 8, and a third pump body is connected to the third pipeline 5, providing driving force for the flow of liquid. This causes the liquid in the pickling tank 3 to flow into the first filter tank 6, the liquid in the first filter tank 6 to flow into the second filter tank 7, and the liquid in the second filter tank 7 to flow into the pickling tank 3, forming a cycle. Simultaneously, control valves are installed on the first pipeline 11, the second pipeline 8, and the third pipeline 5 to control the on / off state of each pipeline.

[0029] Furthermore, the upper openings of the pickling tank 3, the first filter tank 6, and the second filter tank 7 are all used for adding reagents. The inlet of the pickling tank 3 is located at the upper end of the pickling tank 3, and the outlet of the pickling tank 3 is located at the bottom of the pickling tank 3. The inlet of the first filter tank 6 is located at the upper end of the first filter tank 6, and the outlet of the first filter tank 6 is located at the bottom of the first filter tank 6. The inlet of the second filter tank 7 is located at the upper end of the second filter tank 7, and the outlet of the second filter tank 7 is located at the bottom of the second filter tank 7.

[0030] Furthermore, the top cover 1 can be opened and closed by means of sliding, flipping, or directly covering the upper opening of the pickling tank 3.

[0031] Furthermore, the lower end face of the top cover 1 or the upper end face of the pickling tank 3 is connected with sealing materials such as sealing rings to prevent exhaust gas leakage.

[0032] Furthermore, the liquid level in the pickling tank 3 does not exceed 2 / 3 of the height of the pickling tank 3, leaving sufficient upper space for the addition of acid and the recycling of acid, and providing sufficient space for physical methods such as ultrasonic vibration to agitate the solution.

[0033] Furthermore, the first heating device is a heating element, which can be installed on the side wall of the pickling tank 3.

[0034] Furthermore, there are two first ultrasonic oscillation devices, which are respectively set on opposite sides of the pickling tank 3. By emitting ultrasonic waves into the pickling tank 3, the battery cells are promoted to fully contact and react with the acid solution.

[0035] In some embodiments, the top cover 1 is provided with an exhaust port 2, which is connected to an exhaust gas treatment device via an exhaust gas pipe. By providing the top cover 1, the exhaust gas generated in the pickling tank 3 can be prevented from overflowing and polluting the air. By connecting the exhaust port 2 on the top cover 1 to the exhaust gas treatment device, the generated exhaust gas can be treated to prevent air pollution.

[0036] Furthermore, the exhaust port 2 extends through the upper and lower surfaces of the top cover 1, and the exhaust port 2 is connected to the pickling chamber. The exhaust port 2 is located at the center of the top cover 1.

[0037] In some embodiments, a filter tank 4 for holding battery cells is placed inside the pickling chamber. The bottom and side walls of the filter tank 4 are evenly distributed with a plurality of filter holes 43. By setting up the filter tank 4, it is convenient to pick up and put down the battery cells and replace the pickled battery cells. On the other hand, it allows silver and copper elements to flow into the pickling chamber from the filter tank 4 in the form of a solution, which is convenient for subsequent extraction, while preventing impurities from the battery cells from entering the pickling chamber.

[0038] Furthermore, the filter tank 4 is separated from the pickling chamber, and can be removed from the pickling tank 3 by external force. The height of the filter tank 4 is less than the height of the pickling chamber, so that after the filter tank 4 is placed in the pickling chamber, the top cover 1 can be properly placed over the upper opening of the pickling tank 3.

[0039] Furthermore, the pore size of the filter holes 43 on the filter tank 4 is 1 to 10 mm.

[0040] In some embodiments, support legs 42 are fixedly connected to the four corners of the bottom of the filter tank 4, and a gap is left between the outer wall of the filter tank 4 and the pickling tank 3. This allows silver and copper elements to flow from the filter tank 4 into the gap between the filter tank 4 and the pickling tank 3 in the form of a solution.

[0041] In some embodiments, a lifting point 41 is fixedly connected to the edge of the upper end face of the filter tank 4, and the filter tank 4 enters and exits the pickling tank 3 through the upper opening of the pickling tank 3. This facilitates the lifting of the filter tank 4, replacement of the battery cells in the filter tank 4, or replacement of the filter tank 4 and the battery cells as a whole, and prevents operators from directly contacting the filter tank 4 after it has been soaked in acid, which could cause injury to their bodies.

[0042] Furthermore, the lifting point 41 can be a hook or a ring. The lifting points 41 are located on two opposite sides of the upper end face of the filter tank 4.

[0043] In some embodiments, the first filtration device includes: a first filter plate 14 and a first sealing door 15. The first filter plate 14 is retractably connected to the first filtration chamber. The inner sidewall of the first filtration chamber is provided with a first slide rail arranged in a horizontal direction. The first slide rail slides and engages with the side of the first filter plate 14. The first filter plate 14 is located near the bottom of the first filtration chamber. The inlet of the first filtration tank 6 is located on the upper part of the sidewall of the first filtration chamber and above the first filter plate 14. The outlet of the first filtration tank 6 is located in the gap between the first filter plate 14 and the bottom plate of the first filtration chamber. The outlet of the first filtration tank 6 is connected to a first filter screen, which is located inside the first filtration chamber. The first sealing door 15 is fixedly connected to the pull-out end of the first filter plate 14. The sidewall of the first filtration tank 6 has a first pull-out opening. The first sealing door 15 is openable and closable and sealed to the first pull-out opening. The first sealing door 15 is fixedly connected to a first handle. The second filtration device has the same structure and is used in the same way as the first filtration device. This facilitates the collection of product sedimentation.

[0044] During the chemical reaction in the first filtration chamber, the first sealing door 15 and the first filtration tank 6 are sealed and locked to prevent the solution from flowing out through the gap between the first sealing door 15 and the outer wall of the first filtration tank 6. After sedimentation for a period of time, all the liquid in the first filtration chamber needs to be drained. After releasing the sealing and locking state of the first sealing door 15, pull the first handle outward to pull the first sealing door 15 and the first filter plate 14 outward from the first filtration tank 6, and collect the silver chloride precipitate on the first filter plate 14 for recycling. After collection, push the first sealing door 15 and the first filter plate 14 back into the first filtration tank 6 and seal and lock them, so that the first sealing door 15 and the first filtration tank 6 are sealed and locked again.

[0045] Furthermore, the first filter plate 14 can be completely pulled out of the first filtration tank 6. For sediment collection, the sediment on the first filter plate 14 can be poured into the collection box. Inevitably, a small amount of sediment will remain on the first filter plate 14, but this is not a problem; it can be further removed from the first filtration tank 6 for sediment collection. After a period of accumulation, tools such as brushes or high-pressure air guns can be used to remove the sediment adhering to the first filter plate 14.

[0046] Furthermore, the second filtration device includes: a second filter plate 9 and a second sealing door. The second filter plate 9 is removably connected to the second filtration chamber. The inner wall of the second filtration chamber is provided with a second slide rail arranged in a horizontal direction. The second slide rail slides and engages with the side of the second filter plate 9. The second filter plate 9 is located in the second filtration chamber near the bottom. The inlet of the second filtration tank 7 is located on the upper part of the side wall of the second filtration chamber and above the second filter plate 9. The outlet of the second filtration tank 7 is located in the gap between the second filter plate 9 and the bottom plate of the second filtration chamber. The outlet of the second filtration tank 7 is connected to a second filter screen, which is located in the second filtration chamber. The second sealing door is fixedly connected to the pull-out end of the second filter plate 9. The side wall of the second filtration tank 7 is provided with a second pull-out opening. The second sealing door is openable and closure-sealed connected to the second pull-out opening. The second sealing door is fixedly connected to a second handle.

[0047] During the chemical reaction in the second filtration chamber, the second sealing door and the second filtration tank 7 are in a sealed and locked state to prevent the solution from flowing out through the gap between the second sealing door and the outer wall of the second filtration tank 7. After sedimentation for a period of time, all the liquid in the second filtration chamber needs to be drained. After releasing the sealing and locking state of the second sealing door, pull the second handle outward to pull the second sealing door and the second filter plate 9 outward from the second filtration tank 7, and collect the copper sulfide precipitate on the second filter plate 9 for recycling. After collection, push the second sealing door and the second filter plate 9 back into the second filtration tank 7 and seal and lock them, so that the second sealing door and the second filtration tank 7 are once again in a sealed and locked state.

[0048] Furthermore, the sealing and locking structure between the first sealing door 15 and the first filter tank 6 is a conventional structure, which can be a combination of a sealing ring and a fastening device. For example, a sealing ring is connected to the inner side of the first sealing door 15 or the first pull-out opening. The sealing ring is pressed by the first sealing door 15, so that the sealing ring is tightly attached between the first sealing door 15 and the outer wall of the first filter tank 6. Then, the first sealing door 15 and the first filter tank 6 are fastened together by bolts or other fastening devices, which further presses the sealing ring to achieve the sealing and locking effect.

[0049] Furthermore, the first filter plate 14 covers the first filter chamber as completely as possible, so that as much of the sediment as possible falls onto the first filter plate 14.

[0050] Optionally, the first slide can be a groove opened in the inner wall of the first filter chamber, or it can be a horizontally fixed support bar on the inner wall of the first filter chamber. The first filter plate 14 slides horizontally on the support bar, which can be referred to as the principle of a drawer.

[0051] Furthermore, the outlet of the first filtration tank 6 is connected to a first filter screen to prevent trace amounts of sediment from falling below the first filter screen or reacting below it to produce trace amounts of sediment. The first filter screen intercepts these trace amounts of sediment, preventing them from entering the pickling tank 3. The sediment on the first filter screen needs to be collected periodically. Similarly, the outlet of the second filtration tank 7 is also connected to a second filter screen, and the sediment on the second filter screen also needs to be collected periodically.

[0052] It should be noted that the first and second handles can have various structural forms, which are not shown in the figure.

[0053] In some embodiments, the first filter tank 6 is externally connected to a first receiving groove 16, which is located outside the first sealing door 15. The first filter plate 14 is pulled within the range of the first receiving groove 16, and the first sealing door 15 remains within the first receiving groove 16 after being pulled outward. The second filter tank 7 is externally connected to a second receiving groove, which is located outside the second sealing door. The second filter plate 9 is pulled within the range of the second receiving groove, and the second sealing door remains within the second receiving groove after being pulled outward. By providing the receiving groove, it is possible to prevent the liquid remaining on the filter plate from falling directly onto the ground or workbench after the filter plate is pulled out, thus preventing pollution or acid corrosion to the ground or workbench.

[0054] Furthermore, the bottom area of ​​the first receiving tank 16 is slightly larger than the bottom area of ​​the first filter plate 14, so that the solution on the first filter plate 14 can fall entirely into the first receiving tank 16.

[0055] In some embodiments, the first filtration tank 6 is equipped with a second heating device and a second ultrasonic vibration device, and the second filtration tank 7 is equipped with a third heating device and a third ultrasonic vibration device. This can promote the reaction process, make the solution mix evenly, and make the silver and copper elements in the extract form precipitates more completely.

[0056] Furthermore, the second heating device is a heating element, which can be installed on the side wall of the first filter tank 6. The third heating device is a heating element, which can be installed on the side wall of the second filter tank 7.

[0057] Furthermore, two second ultrasonic oscillation devices are provided, respectively located on opposite sides within the first filtration tank 6. By emitting ultrasonic waves into the first filtration tank 6, the liquid reaction is made more complete, and the sedimentation is made more complete. Two third ultrasonic oscillation devices are provided, respectively located on opposite sides within the second filtration tank 7. By emitting ultrasonic waves into the second filtration tank 7, the liquid reaction is made more complete, and the sedimentation is made more complete.

[0058] In some embodiments, a first spraying device is connected to the first receiving tank 16, which sprays water onto the first filter plate 14 pulled outward; a second spraying device is connected to the second receiving tank, which sprays water onto the second filter plate 9 pulled outward. The first and second spraying devices are connected to the water inlet pipe 10. This facilitates the cleaning of the filter plates and the liquid adhering to the sediment.

[0059] Furthermore, the solutions collected in the first and second receiving tanks can be reused. Drain pipes are connected to the bottom of both the first and second receiving tanks, and control valves are installed on these pipes. When the first or second receiving tank is nearly full, the collected solution can be discharged into a designated collection tank for further processing and reuse, or it can be reused directly. Specific processing and reuse methods are not detailed here.

[0060] In some embodiments, the first spraying device includes: a first spray pipe 12 and a first support frame 13. The first spray pipe 12 is closely attached to the outer wall of the first filter tank 6 and is arranged horizontally. A plurality of first nozzles are evenly distributed below the first spray pipe 12, and the first nozzles spray vertically downwards onto the first filter plate 14. The first spray pipe 12 is connected to the water inlet pipe 10. The first support frame 13 is fixedly connected between the first spray pipe 12 and the first receiving groove 16, and the first support frame 13 is connected to both ends of the first spray pipe 12. The second spraying device has the same structure as the first spraying device. This makes the spraying device spray the filter plate and sediment more evenly.

[0061] During spraying, the operator can pull the first filter plate 14 outward while spraying the sediment on the first filter plate 14.

[0062] Furthermore, the second spraying device includes: a second spraying pipe and a second support frame. The second spraying pipe is closely attached to the outer wall of the second filter tank 7 and is arranged in a horizontal direction. Several second nozzles are evenly distributed below the second spraying pipe. The second nozzles spray vertically downwards onto the second filter plate 9. The second spraying pipe is connected to the water inlet pipe 10. The second support frame is fixedly connected between the second spraying pipe and the second receiving tank. The second support frame is connected to both ends of the second spraying pipe.

[0063] In some embodiments, the inner walls of the pickling tank 3, the first filter tank 6, the second filter tank 7, the first receiving tank 16, the second receiving tank, the first pipeline 11, the second pipeline 8, the third pipeline 5, and other equipment or components in direct contact with the liquid are made of acid-resistant materials, such as polytetrafluoroethylene (PTFE), to ensure that the relevant equipment or components are not corroded by acidic solutions. The filter screens of the first filter plate 14, the second filter plate 9, the first filter screen, and the second filter screen can be made of acid-resistant metal materials, such as stainless steel, titanium alloy, or PTFE.

[0064] When using it, the following steps are included:

[0065] S1. After weighing the battery cells, place them in the filter tank 4. Add excess acid to the pickling tank 3, place the filter tank 4 into the pickling tank 3, and cover the top cover 1 over the pickling tank 3. Turn on the first ultrasonic vibration device and the first heating device to heat the pickling tank 3 at a constant temperature of 35-70°C. After a period of time, a first extract containing silver and copper ions is obtained. The waste gas generated during the pickling process is discharged through the exhaust port 2. After the waste gas is treated by the waste gas treatment device, it is discharged into the air. After the pickling is completed, open the top cover 1, lift the filter tank 4 with the lifting device, remove it from the pickling tank 3, drain the filter tank 4, replace the battery cells in the filter tank 4, or replace the filter tank 4 and the battery cells as a whole, and continue to put it into the pickling tank 3 for pickling.

[0066] S2, after acid washing several batches of battery cells, open the control valve on the first pipeline 11 to deliver the first extract to the first filter tank 6, add an appropriate amount of NaCl saturated solution to the first filter tank 6 to obtain silver chloride precipitate and second extract, and recover the silver chloride precipitate through the first filter plate 14.

[0067] S3. The second extract is transferred to the second filter tank 7. An appropriate amount of saturated Na2S solution is added to the second filter tank 7 to obtain copper sulfide precipitate and the third extract. The copper sulfide precipitate is recovered through the second filter plate 9. The third extract, which does not contain silver or copper ions, is transferred back to the pickling tank 3 for reuse. The pH value in the pickling tank 3 is monitored using a pH meter and must be maintained between 2 and 5. When the pH value in the pickling tank 3 is greater than 5, acid solution needs to be added to the pickling tank 3 in a timely manner to start the next pickling cycle.

[0068] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0069] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0070] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0071] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0072] In this invention, the term "some embodiments," etc., refers to specific features, structures, materials, or characteristics described in connection with that embodiment, which are included in at least one embodiment of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiments. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments. Moreover, those skilled in the art can combine and integrate the different embodiments described in this specification and the features of the different embodiments without contradiction.

[0073] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A metal extraction device for photovoltaic cells, characterized in that, include: A pickling tank, wherein the pickling tank has a pickling chamber and an upper opening, an inlet and an outlet communicating with the pickling chamber, the upper opening of the pickling tank is openable and sealed with a top cover, and the pickling tank is equipped with a first heating device, a first ultrasonic vibration device and a pH meter. The first filter tank has a first filter chamber and an upper opening, an inlet and an outlet that connect the first filter chamber. The inlet of the first filter tank is connected to the outlet of the pickling tank through a first pipeline. The first filter tank is equipped with a first filter device. The second filter tank has a second filter chamber and an upper opening, an inlet and an outlet that connect the second filter chamber. The inlet of the second filter tank is connected to the outlet of the first filter tank through a second pipeline. The second filter tank is equipped with a second filter device. The outlet of the second filter tank is connected to the inlet of the pickling tank through a third pipeline. The first filtration device includes: The first filter plate is retractable and connected to the first filter chamber. The inner sidewall of the first filter chamber is provided with a first slide rail arranged in the horizontal direction. The first slide rail is slidably engaged with the side of the first filter plate. The first filter plate is located in the first filter chamber near the bottom. The liquid inlet of the first filter tank is located on the upper part of the sidewall of the first filter chamber and above the first filter plate. The liquid outlet of the first filter tank is located in the gap between the first filter plate and the bottom plate of the first filter chamber. The liquid outlet of the first filter tank is connected to a first filter screen, which is located in the first filter chamber. The first sealing door is fixedly connected to the pull-out end of the first filter plate. The side wall of the first filter tank is provided with a first pull-out opening. The first sealing door is openable and sealed to the first pull-out opening. The first sealing door is fixedly connected with a first handle. The second filter device has the same structure as the first filter device.

2. The metal extraction device for photovoltaic cells according to claim 1, characterized in that, The top cover is provided with an exhaust port, which is connected to an exhaust gas treatment device through an exhaust gas pipe.

3. The metal extraction device for photovoltaic cells according to claim 1, characterized in that, The pickling chamber contains a filter tank for holding battery cells, and the bottom and side walls of the filter tank are provided with a number of filter holes.

4. The metal extraction device for photovoltaic cells according to claim 3, characterized in that, Support legs are fixedly connected to the four corners of the bottom of the filter tank, and a gap is left between the outer wall of the filter tank and the pickling tank.

5. The metal extraction device for photovoltaic cells according to claim 3, characterized in that, The filter tank is fixedly connected to a lifting point at the edge of its upper end face, and the filter tank enters and exits the pickling tank through the upper opening of the pickling tank.

6. The metal extraction device for photovoltaic cells according to claim 1, characterized in that, The first filter tank is externally connected to a first receiving groove, which is located outside the first sealing door. The first filter plate is pulled within the range of the first receiving groove, and the first sealing door remains within the first receiving groove after being pulled outward. The second filter tank is externally connected to a second receiving groove, which is located outside the second sealing door. The second filter plate is pulled within the range of the second receiving groove, and the second sealing door remains within the second receiving groove after being pulled outward.

7. The metal extraction device for photovoltaic cells according to claim 1, characterized in that, The first filtration tank is equipped with a second heating device and a second ultrasonic vibration device, and the second filtration tank is equipped with a third heating device and a third ultrasonic vibration device.

8. The metal extraction apparatus for photovoltaic cells according to claim 6, characterized in that, A first spraying device is connected to the first receiving tank, and the first spraying device sprays the first filter plate that is pulled outward; a second spraying device is connected to the second receiving tank, and the second spraying device sprays the second filter plate that is pulled outward. The first spraying device and the second spraying device are connected to the water inlet pipe.

9. The metal extraction apparatus for photovoltaic cells according to claim 8, characterized in that, The first spray device includes: The first spray pipe is closely attached to the outer wall of the first filter tank and is arranged in a horizontal direction. Several first nozzles are evenly distributed below the first spray pipe. The first nozzles spray vertically downwards onto the first filter plate. The first spray pipe is connected to the water inlet pipe. A first support frame is fixedly connected between the first spray pipe and the first receiving groove, and the first support frame is connected to both ends of the first spray pipe; The second spray device has the same structure as the first spray device.

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