A metal recovery device for lithium battery wastewater treatment and a recovery method thereof

Abstract

The application belongs to the technical field of wastewater treatment, and discloses a metal recovery device for lithium battery wastewater treatment and a recovery method thereof, which comprises a treatment cylinder, a rotating shaft is rotatably installed at the bottom of the treatment cylinder, an installation outer pipe is threadedly sleeved with the top surface of the rotating shaft, and an installation inner pipe is movably sleeved in the installation outer pipe. The rotation of the installation outer pipe is matched, intermittent communication between the installation outer pipe and the installation inner pipe is realized, the medicine in the installation inner pipe is synchronously compressed by matching the assembly type compression assembly, the medicine in the installation outer pipe is intermittently sprayed into the treatment cylinder, the medicine is intermittently sprayed from the inside of the wastewater and mixed, air supply of the air pump is matched, the rotation of the collecting assembly is utilized, air flow is intermittently sprayed in the treatment cylinder, the air flow is disturbed in the wastewater, the mixing of the sprayed medicine is completed, the medicine mixing speed is greatly improved, the metal recovery and precipitation speed is improved, and the recovery and treatment efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically a metal recovery device and method for lithium battery wastewater treatment. Background Technology

[0002] Metal recovery units in lithium battery wastewater treatment are specially designed devices for extracting and recovering metals from lithium battery production wastewater. These units combine multiple technologies to achieve efficient metal recovery and reduce environmental pollution.

[0003] Existing metal recovery devices for lithium battery wastewater treatment typically involve adding chemical agents to form a mixed precipitate of metal components in the wastewater. This precipitate is then separated from the wastewater by a filtration system, followed by further treatment of the precipitate to recover and extract the metal. However, the method of adding chemicals during wastewater treatment, which usually involves direct feeding from above the liquid surface, is limited by the volume and depth of the wastewater. This makes it difficult for the added chemicals to disperse quickly and evenly, resulting in low efficiency. While using a stirring mechanism requires space within the wastewater treatment tank, affecting the subsequent filtration and collection of precipitates, it also increases the complexity of the internal structure of the wastewater treatment tank, making maintenance and cleaning more difficult, ultimately leading to poor overall performance. Summary of the Invention

[0004] The purpose of this invention is to provide a metal recovery device and method for lithium battery wastewater treatment, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a metal recovery device and method for lithium battery wastewater treatment, comprising a processing cylinder, a rotating shaft rotatably mounted at the bottom of the processing cylinder, an outer mounting tube threaded onto the top surface of the rotating shaft, an inner mounting tube movably mounted inside the outer mounting tube, an outlet and an outlet hole respectively opened on the outer surfaces of the outer mounting tube and the inner mounting tube, a prefabricated compression assembly movably mounted at the top of the processing cylinder, the bottom of the prefabricated compression assembly being fixedly connected to the inner mounting tube, the movable end of the prefabricated compression assembly being movably mounted in the inner mounting tube, and a motor provided at the bottom of the processing cylinder, the output shaft of the motor being fixedly connected to the rotating shaft.

[0006] Preferably, the assembled compression assembly includes an assembly frame, an electric push rod, a connecting rod, and a compression rod. The assembly frame is movably mounted on the top of the processing cylinder, the electric push rod is fixedly mounted inside the assembly frame, the connecting rod is fixedly connected to the bottom surface of the assembly frame, and the compression rod is fixedly connected to the movable end of the electric push rod.

[0007] Preferably, the lower end of the connecting rod is fixedly connected to the inner mounting tube, and the compression rod is movably sleeved inside the inner mounting tube.

[0008] Preferably, the outer surface of the inner tube is fixedly connected to a guide tube, and the upper end of the guide tube is fixedly connected to a dosing cartridge.

[0009] Preferably, a collection component is movably sleeved inside the processing cylinder, and the collection component is fixedly sleeved on the lower end of the outer surface of the mounting outer tube.

[0010] Preferably, the collection assembly includes a filter plate, a connecting cylinder, a collection cylinder, and a second inclined air outlet hole. The connecting cylinder is fixedly sleeved in the middle of the filter plate, the collection cylinder is fixedly connected to the top surface of the filter plate, and the second inclined air outlet hole is opened on the outer surface of the collection cylinder.

[0011] Preferably, the processing cylinder has a connecting groove and an annular cavity inside. The connecting grooves are distributed in a ring at equal intervals and are all connected to the annular cavity. An air pump is fixedly installed on the outside of the processing cylinder, and the air outlet of the air pump is fixedly connected to the top surface of the processing cylinder and is connected to the annular cavity.

[0012] Preferably, the inner surface of the processing cylinder is provided with an oblique air outlet hole, which is connected to the connecting groove.

[0013] A method for recycling metals in a lithium battery wastewater treatment device includes the following steps:

[0014] Step 1: During processing, first insert the outer tube with the collection component into the processing cylinder, ensuring that the threaded outer tube is connected to the top hole of the rotating shaft. Then place the assembled compression component on top of the processing cylinder, ensuring that the inner tube is connected to the outer tube and that the outlet and outlet hole are staggered.

[0015] Step 2: Then, the wastewater to be treated is poured into the treatment cylinder, and the reagent is added along the dosing cylinder, so that the reagent enters the inner installation tube along the guide tube and falls into the bottom space inside the inner installation tube. Start the motor to drive the rotating shaft to rotate, and at the same time start the electric push rod. As the rotating shaft drives the outer installation tube to rotate, the compression rod compresses the liquid downward. As the liquid outlet and liquid outlet hole are intermittently connected, the liquid is intermittently sprayed into the interior of the treatment cylinder.

[0016] Step 3: Simultaneously start the air pump, which introduces gas into the annular cavity and injects it into each group of connecting slots. As the collecting component rotates, when the second outlet oblique hole connects with the first outlet oblique hole, the airflow is sprayed into the processing cylinder to complete the disturbance.

[0017] Step 4: After the mixing and dosing are completed, a large amount of precipitate will gradually form in the treatment tank. Stop the pumping and rotation, let it stand and settle. After settling for a period of time, open the bottom sealing plug of the treatment tank to discharge the waste liquid. The precipitate will be filtered into the collection component. After the drainage and filtration are completed, remove the assembled compression component and unscrew the installation outer tube to directly remove the filtered and collected precipitate, thus completing the metal recovery from the waste liquid.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. This invention adds a prefabricated compression assembly to the top of the treatment cylinder, which, together with a threaded mounting outer tube on the top of the rotating shaft, allows the mounting inner tube to be movably sleeved within the mounting outer tube. After the reagent is added to the mounting inner tube, the rotation of the mounting outer tube intermittently connects the two tubes, and the prefabricated compression assembly synchronously compresses the reagent in the mounting inner tube, causing the outer tube to intermittently spray the reagent into the treatment cylinder. This achieves intermittent injection and mixing of the reagent from inside the wastewater. Furthermore, with the air pump supply and the rotation of the collection assembly, airflow is intermittently ejected from inside the treatment cylinder. The airflow agitates the wastewater, further mixing the injected reagent. This method of injecting the reagent from the inside significantly improves the reagent mixing speed, increases the metal recovery and sedimentation rate, and enhances the recycling efficiency.

[0020] 2. This invention utilizes intermittent airflow injection into the treatment cylinder to agitate the wastewater. Furthermore, the threaded outer and inner installation pipes enable intermittent injection and mixing of the reagents. During the reagent injection and mixing process, no stirring mechanism is required, reducing the impact of the stirring mechanism on the filtration and collection of sediment in the treatment cylinder. This also reduces the volume occupied by the equipment within the treatment cylinder. Moreover, the assembled compression components and outer installation pipes are installed and fixed using an assembly method, making them easy to disassemble, maintain, and repair, resulting in excellent performance.

[0021] 3. This invention utilizes the connection and fixation of the collection component and the installation outer pipe. During wastewater treatment, the collection component rotates with the installation outer pipe, causing the gas introduced into the connecting groove by the air pump to intermittently connect with the gas outlet oblique hole, thereby achieving intermittent control of the airflow injection. At the same time, the collection component, which is directly submerged inside the treatment cylinder, automatically filters and collects the sediment after draining the water at the bottom. In conjunction with the detachable installation outer pipe, the entire sediment can be directly separated and removed from the treatment cylinder after filtration and collection. For sediment in metal recycling treatment, the recycling and transfer efficiency is greatly improved, and the effect is good. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a cross-sectional schematic diagram of the present invention;

[0024] Figure 3 This is a schematic diagram of the installation of the collection component and the mounting outer tube of the present invention;

[0025] Figure 4 This is an exploded view of the assembled compression assembly and the mounting inner tube of the present invention;

[0026] Figure 5 An exploded view of the installation of the inner tube and the outer tube of the present invention;

[0027] Figure 6 This is a cross-sectional schematic diagram of the components used in this invention;

[0028] Figure 7 This is a cross-sectional schematic diagram of the processing cylinder of the present invention.

[0029] In the diagram: 1. Processing cylinder; 2. Rotating shaft; 3. Motor; 4. Installing outer tube; 5. Installing inner tube; 6. Liquid outlet; 7. Liquid outlet hole; 8. Assembled compression assembly; 81. Assembly frame; 82. Electric push rod; 83. Connecting rod; 84. Compression rod; 9. Guide curved tube; 10. Dosing cylinder; 11. Collection assembly; 111. Filter plate; 112. Connecting cylinder; 113. Collection cylinder; 114. Second inclined air outlet hole; 12. Air pump; 13. Connecting groove; 14. Annular cavity; 15. First inclined air outlet hole. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] like Figures 1 to 7 As shown, this embodiment of the invention provides a metal recovery device and method for lithium battery wastewater treatment, including a treatment cylinder 1. A rotating shaft 2 is rotatably mounted at the bottom of the treatment cylinder 1. An outer mounting tube 4 is threaded onto the top surface of the rotating shaft 2. An inner mounting tube 5 is movably mounted inside the outer mounting tube 4. An outlet 6 and an outlet hole 7 are respectively opened on the outer surfaces of the outer mounting tube 4 and the inner mounting tube 5. An assembled compression assembly 8 is movably mounted at the top of the treatment cylinder 1. The bottom of the assembled compression assembly 8 is fixedly connected to the inner mounting tube 5. The movable end of the assembled compression assembly 8 is movably mounted in the inner mounting tube 5. A motor 3 is provided at the bottom of the treatment cylinder 1. The output shaft of the motor 3 is fixedly connected to the rotating shaft 2.

[0032] Example 1: As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, first, the outer mounting tube 4, equipped with the collection component 11, is inserted into the treatment cylinder 1, ensuring that the outer mounting tube 4 is threaded into the top hole of the rotating shaft 2. Then, the assembled compression component 8 is placed on top of the treatment cylinder 1, ensuring that the inner mounting tube 5 is fitted into the outer mounting tube 4, and that the outlet 6 and outlet hole 7 are staggered. Next, the wastewater to be treated is poured into the treatment cylinder 1, and the reagent is added along the dosing cylinder 10, allowing the reagent to enter the inner mounting tube 5 along the guide tube 9 and fall into the bottom space inside the inner mounting tube 5. The process is then initiated. Motor 3 drives shaft 2 to rotate, and simultaneously starts electric push rod 82. As shaft 2 drives outer tube 4 to rotate, compression rod 84 compresses the liquid medicine downward. As outlet 6 and outlet hole 7 intermittently connect, the liquid medicine is intermittently sprayed into the interior of treatment cylinder 1. At the same time, air pump 12 is started, and air pump 12 introduces gas into annular cavity 14 and injects it into each group of connecting grooves 13. As collection component 11 rotates, when outlet oblique hole 2 114 connects with outlet oblique hole 15, airflow is sprayed into treatment cylinder 1, completing disturbance and mixing.

[0033] First, by adding a prefabricated compression assembly 8 to the top of the treatment cylinder 1, and cooperating with the installation outer tube 4 threaded onto the top of the rotating shaft 2, the installation inner tube 5 is movably sleeved in the installation outer tube 4. After the agent is put into the installation inner tube 5, the rotation of the installation outer tube 4 causes the installation outer tube 4 and the installation inner tube 5 to be intermittently connected. The prefabricated compression assembly 8 synchronously compresses the agent in the installation inner tube 5, causing the installation outer tube 4 to intermittently spray the agent into the treatment cylinder 1. This achieves intermittent injection and mixing of the agent from inside the wastewater. In conjunction with the air supply from the air pump 12, the rotation of the collection assembly 11 causes the airflow to be intermittently ejected from inside the treatment cylinder 1. The airflow turbulents in the wastewater, completing the mixing of the injected agent. This method of injecting the agent from the inside greatly improves the agent mixing speed, increases the metal recovery and sedimentation speed, and improves the recycling and treatment efficiency.

[0034] Furthermore, by intermittently injecting airflow into the treatment cylinder 1, the wastewater is disturbed. In conjunction with the threaded installation outer pipe 4 and installation inner pipe 5, the intermittent injection and mixing of the reagents are achieved. During the reagent injection and mixing process, there is no need to use a stirring mechanism for stirring, which reduces the impact of the stirring mechanism on the filtration and collection of sediment in the treatment cylinder 1 and reduces the volume occupied by the equipment mechanism in the treatment cylinder 1. Moreover, the assembled compression assembly 8 and the installation outer pipe 4 are installed and fixed by assembly, which is convenient for disassembly, maintenance and treatment, and has good performance.

[0035] Example 2: Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, after the mixing and dosing are completed, a large amount of precipitate gradually forms in the treatment cylinder 1. The pumping and rotation are stopped, and the cylinder is allowed to settle. After settling for a period of time, the bottom sealing plug of the treatment cylinder 1 is opened to discharge the waste liquid. The precipitate is filtered into the collection component 11. After the drainage and filtration are completed, the assembled compression component 8 is removed, and the installation outer tube 4 is unscrewed out. The filtered and collected precipitate is then directly removed, thus completing the metal recovery from the waste liquid.

[0036] First, by using the connection and fixation of the collection component 11 and the installation outer pipe 4, during the wastewater treatment process, the collection component 11 rotates with the installation outer pipe 4, so that the gas introduced into the connecting groove 13 by the air pump 12 intermittently communicates with the air outlet inclined hole 15, realizing the intermittent control of the airflow injection. At the same time, the collection component 11, which is directly submerged inside the treatment cylinder 1, automatically filters and collects the sediment after draining the water at the bottom. In conjunction with the detachable installation outer pipe 4, the sediment is directly separated and removed from the treatment cylinder 1 after filtration and collection. For the sediment of metal recycling treatment, the recycling and transfer efficiency is greatly improved, and the use effect is good.

[0037] The prefabricated compression assembly 8 includes an assembly frame 81, an electric push rod 82, a connecting rod 83, and a compression rod 84. The assembly frame 81 is movably installed on the top of the treatment cylinder 1. The electric push rod 82 is fixedly installed inside the assembly frame 81. The connecting rod 83 is fixedly connected to the bottom surface of the assembly frame 81. The compression rod 84 is fixedly connected to the movable end of the electric push rod 82. The lower end of the connecting rod 83 is fixedly connected to the inner mounting tube 5. The compression rod 84 is movably sleeved inside the inner mounting tube 5. The outer surface of the inner mounting tube 5 is fixedly connected to a guide curved tube 9. The upper end of the guide curved tube 9 is fixedly connected to a dosing cylinder 10.

[0038] The compressed agent in the inner tube 5 is compressed and sprayed out by using the assembled compression assembly 8. The electric push rod 82 provides the power for up and down movement. The compression rod 84 has a dynamic sealing effect in the inner tube 5, maintaining a relative seal during dynamic compression. When the bottom end of the compression rod 84 moves to the top of the lower end of the guide tube 9, the injected agent is automatically filled into the inner tube 5. The two ends of the assembly frame 81 can be locked and fixed to the top of the treatment cylinder 1 by bolts, which facilitates disassembly and transfer.

[0039] The processing cylinder 1 is movably fitted with a collection component 11, which is fixedly fitted to the lower end of the outer surface of the mounting outer tube 4. The collection component 11 includes a filter plate 111, a connecting cylinder 112, a collection cylinder 113, and an outlet oblique hole 114. The connecting cylinder 112 is fixedly fitted to the middle of the filter plate 111, the collection cylinder 113 is fixedly connected to the top surface of the filter plate 111, and the outlet oblique hole 114 is opened on the outer surface of the collection cylinder 113.

[0040] The collection component 11 filters and collects the precipitate containing the separated metal components by the reagent mixture. At the same time, during the rotation process, the intermittent connection between the second inclined air outlet 114 and the first inclined air outlet 15 is used to introduce airflow at an angle towards the wastewater, thereby completing the airflow disturbance.

[0041] The processing cylinder 1 has a connecting groove 13 and an annular cavity 14 inside. The connecting grooves 13 are distributed in a ring at equal intervals and are all connected to the annular cavity 14. An air pump 12 is fixedly installed on the outside of the processing cylinder 1. The air outlet end of the air pump 12 is fixedly connected to the top surface of the processing cylinder 1 and is connected to the annular cavity 14. An air outlet oblique hole 15 is opened on the inner surface of the processing cylinder 1 and is connected to the connecting groove 13.

[0042] The annular cavity 14 is connected to multiple sets of connecting slots 13, ensuring that the gas input from the air pump 12 is distributed to the multiple sets of connecting slots 13 and blown out through the second oblique outlet hole 114.

[0043] A method for recycling metals in a lithium battery wastewater treatment device includes the following steps:

[0044] Step 1: During processing, first insert the outer tube 4 with the collection component 11 into the processing cylinder 1, and keep the outer tube 4 threaded into the top hole of the rotating shaft 2. Then place the assembled compression component 8 on top of the processing cylinder 1, keep the inner tube 5 in the outer tube 4, and make the outlet 6 and the outlet hole 7 staggered.

[0045] Step 2: Then, the wastewater to be treated is poured into the treatment cylinder 1, and the reagent is added along the dosing cylinder 10, so that the reagent enters the inner installation tube 5 along the guide tube 9 and falls into the bottom space inside the inner installation tube 5. Start the motor 3 to drive the rotating shaft 2 to rotate, and at the same time start the electric push rod 82. As the rotating shaft 2 drives the outer installation tube 4 to rotate, the compression rod 84 compresses the liquid downward. As the liquid outlet 6 and the liquid outlet hole 7 are intermittently connected, the liquid is intermittently sprayed into the interior of the treatment cylinder 1.

[0046] Step 3: Simultaneously start the air pump 12. The air pump 12 introduces gas into the annular cavity 14 and injects it into each group of connecting slots 13. As the collecting component 11 rotates, when the second outlet oblique hole 114 connects with the first outlet oblique hole 15, the airflow is sprayed into the processing cylinder 1 to complete the disturbance.

[0047] Step 4: After the mixing and dosing are completed, a large amount of precipitate will gradually form in the treatment cylinder 1. Stop the pumping and rotation, let it stand and settle. After settling for a period of time, open the bottom sealing plug of the treatment cylinder 1 to discharge the waste liquid. The precipitate is filtered into the collection component 11. After the drainage and filtration are completed, remove the assembled compression component 8 and unscrew the installation outer tube 4 to directly remove the filtered and collected precipitate, thus completing the metal recovery from the waste liquid.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A metal recovery device for lithium battery wastewater treatment, comprising a treatment cylinder (1), characterized in that: The bottom of the processing cylinder (1) is rotatably connected with a rotating shaft (2), the top surface of the rotating shaft (2) is threadedly connected with an installation outer tube (4), the inside of the installation outer tube (4) is movably connected with an installation inner tube (5), the outer surface of the installation outer tube (4) and the installation inner tube (5) is respectively provided with a liquid outlet (6) and a liquid outlet hole (7), the top of the processing cylinder (1) is movably connected with an assembled compression assembly (8), the bottom of the assembled compression assembly (8) is fixedly connected with the installation inner tube (5), the movable end of the assembled compression assembly (8) is movably connected in the installation inner tube (5), the bottom of the processing cylinder (1) is provided with a motor (3), the output shaft of the motor (3) is fixedly connected with the rotating shaft (2). The inside of the processing cylinder (1) is movably connected with a collecting assembly (11), the collecting assembly (11) is fixedly connected on the lower end of the outer surface of the installation outer tube (4). The collecting assembly (11) comprises a filter plate (111), a connecting cylinder (112), a collecting cylinder (113) and a gas outlet inclined hole (114), the connecting cylinder (112) is fixedly connected on the middle part of the filter plate (111), the collecting cylinder (113) is fixedly connected on the top surface of the filter plate (111), the gas outlet inclined hole (114) is formed on the outer surface of the collecting cylinder (113). The inside of the processing cylinder (1) is provided with a communication groove (13) and a ring cavity (14), the communication grooves (13) are annularly and equidistantly distributed and are in communication with the ring cavity (14), the outside of the processing cylinder (1) is fixedly provided with an air pump (12), the air outlet end of the air pump (12) is fixedly connected on the top surface of the processing cylinder (1) and is in communication with the ring cavity (14). The inner surface of the processing cylinder (1) is provided with a gas outlet inclined hole (15), the gas outlet inclined hole (15) is in communication with the communication groove (13).

2. The metal recovery device for lithium battery wastewater treatment according to claim 1, characterized in that: The assembled compression assembly (8) comprises an assembling frame (81), an electric push rod (82), a connecting rod (83) and a compression rod (84), the assembling frame (81) is movably connected on the top of the processing cylinder (1), the electric push rod (82) is fixedly connected in the inside of the assembling frame (81), the connecting rod (83) is fixedly connected on the bottom surface of the assembling frame (81), the compression rod (84) is fixedly connected on the movable end of the electric push rod (82).

3. The metal recovery device for lithium battery wastewater treatment according to claim 2, characterized in that: The lower end of the connecting rod (83) is fixedly connected with the installation inner tube (5), the compression rod (84) is movably connected in the inside of the installation inner tube (5).

4. The metal recovery device for lithium battery wastewater treatment according to claim 3, characterized in that: The outer surface of the installation inner tube (5) is fixedly connected with a guide elbow (9), the upper end of the guide elbow (9) is fixedly connected with a dosing cylinder (10).

5. The recovery method of the metal recovery device for lithium battery wastewater treatment according to claim 4, characterized in that: The method comprises the following steps: First step: during the processing, the installation outer tube (4) provided with the collecting assembly (11) is sleeved into the processing cylinder (1), the installation outer tube (4) is threadedly connected in the top hole of the rotating shaft (2), the assembled compression assembly (8) is arranged on the top of the processing cylinder (1), the installation inner tube (5) is sleeved in the installation outer tube (4), and the liquid outlet (6) and the liquid outlet hole (7) are staggered. Second step: then the wastewater to be treated is poured into the treatment cylinder (1), the reagent is put into along the dosing cylinder (10), so that the reagent enters the installation inner tube (5) along the guide elbow (9) and falls into the bottom space inside the installation inner tube (5), the motor (3) is started to drive the rotating shaft (2) to rotate, and the electric push rod (82) is started, so that the installation outer tube (4) is rotated by the rotating shaft (2), the compression rod (84) compresses the liquid medicine downward, and the liquid medicine is intermittently sprayed into the inside of the treatment cylinder (1) as the liquid outlet (6) and the liquid outlet hole (7) are intermittently connected; Third step: the air pump (12) is started at the same time, the air pump (12) introduces air into the ring cavity (14) and injects into each group of communication grooves (13), and as the rotation of the collection assembly (11), when the air outlet inclined hole two (114) is communicated with the air outlet inclined hole one (15), the air flow is sprayed into the treatment cylinder (1), and the disturbance is completed; Fourth step: after the mixing and reagent adding are completed, a large amount of precipitate is gradually formed in the treatment cylinder (1), the air pumping and rotation are cancelled, the sedimentation is static, after a period of time, the bottom sealing plug of the treatment cylinder (1) is opened, the waste liquid is discharged, the precipitate is filtered in the collection assembly (11), after the liquid discharge and filtration are completed, the assembled compression assembly (8) is taken off, the installation outer tube (4) is unscrewed, the filtered and collected precipitate is directly taken out, and the metal recovery in the waste liquid is completed.

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