A device and method for preparing chemically formed foil for low-voltage high-dielectric aluminum electrolytic capacitors

Abstract

The invention discloses a chemically formed foil preparation device for low-voltage high-dielectric aluminum electrolytic capacitors and a preparation method thereof, comprising a corrosion treatment tank body, the corrosion treatment tank body comprising a pre-treatment tank, a water washing tank 1, a middle treatment tank, a water washing tank 2, a chemical treatment tank and a post-treatment tank, wherein the inside of the middle treatment tank is respectively provided with a corrosion chamber 1, a corrosion chamber 2 and a corrosion chamber 3, a waste acid pool 1 is provided on one side of the rear end of the middle treatment tank, a waste acid pool 2 is provided on the other side of the rear end of the middle treatment tank, a waste acid recovery device is fixedly installed on the rear end of the waste acid pool 2, and a water purifier raw material pipe is provided on one side of the waste acid recovery device. It realizes the ability to recycle waste acid and reduces the waste of resources, thereby solving the problem that the traditional waste acid treatment method mostly adopts processes such as neutralization and precipitation, which is often accompanied by the generation of a large amount of solid waste, and the treatment cost is high, and the useful components in the waste acid such as hydrochloric acid and sulfuric acid cannot be effectively recycled.

Description

Technical Field

[0001] The invention relates to the technical field of chemically formed foil preparation devices, in particular to a chemically formed foil preparation device for low-voltage high-dielectric aluminum electrolytic capacitors and a preparation method thereof. Background Art

[0002] The formed foil for low-voltage and high-dielectric aluminum electrolytic capacitors is widely used in various electronic devices, such as communication equipment, computers, consumer electronics, etc. With the continuous development of electronic technology, the performance requirements for capacitors are getting higher and higher, so the market demand for low-voltage and high-dielectric formed foil is also increasing;

[0003] In the manufacturing process of low-voltage high-dielectric aluminum electrolytic capacitors, chemical foil is a key material, and its performance directly affects the capacitance value, stability and service life of the capacitor. In the traditional chemical foil preparation process, corrosion treatment is a key link, which is used to increase the surface area of ​​the aluminum foil, thereby improving its capacitance performance. However, a large amount of waste acid is generated in this process. If it is not handled properly, it will not only cause a waste of resources, but also may cause serious pollution to the environment.

[0004] In the chemical foil preparation process, traditional waste acid treatment methods mostly use neutralization, precipitation and other processes. Although these methods can effectively remove harmful substances in the waste acid, they are often accompanied by the generation of a large amount of solid waste and have high treatment costs. In addition, useful components in the waste acid, such as hydrochloric acid and sulfuric acid, have not been effectively recycled, resulting in a huge waste of resources. Therefore, the market urgently needs to develop a chemical foil preparation device and a preparation method for low-voltage and high-dielectric aluminum electrolytic capacitors to help people solve existing problems. Summary of the invention

[0005] The purpose of the present invention is to provide a device for preparing a formed foil for a low-voltage high-dielectric aluminum electrolytic capacitor and a preparation method thereof, so as to solve the problem that the traditional waste acid treatment method proposed in the above background technology mostly adopts neutralization, precipitation and other processes, which is often accompanied by the generation of a large amount of solid waste and has a high treatment cost, and the useful components in the waste acid such as hydrochloric acid and sulfuric acid cannot be effectively recycled, resulting in a huge waste of resources.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for preparing chemically formed foil for low-voltage high-dielectric aluminum electrolytic capacitors, comprising a corrosion treatment tank body, wherein the corrosion treatment tank body comprises a pre-treatment tank, a water washing tank 1, a middle treatment tank, a water washing tank 2, a chemical treatment tank and a post-treatment tank, wherein the inside of the middle treatment tank is respectively provided with a corrosion chamber 1, a corrosion chamber 2 and a corrosion chamber 3, a waste acid pool 1 is provided on one side of the rear end of the middle treatment tank, a waste acid pool 2 is provided on the other side of the rear end of the middle treatment tank, a waste acid recovery device is fixedly installed at the rear end of the waste acid pool 2, and a water purifier raw material pipe is provided on one side of the waste acid recovery device.

[0007] Preferably, the rear end of the middle treatment tank is fixedly installed with recovery pipe 1, recovery pipe 2 and recovery pipe 3, respectively, and the recovery pipe 1, recovery pipe 2 and recovery pipe 3 are respectively connected with corrosion chamber 1, corrosion chamber 2 and corrosion chamber 3; one end of the recovery pipe 1 is provided with pump box 1, and an output pipe 1 is provided above the pump box 1, and the upper end of the output pipe 1 is fixedly connected to the waste acid tank 1; one end of the recovery pipe 2 is provided with pump box 2, and an output pipe 2 is provided above the pump box 2, and the upper end of the output pipe 2 is fixedly connected to the waste acid tank 1; one end of the recovery pipe 3 is provided with pump box 3, and an output pipe 3 is provided above the pump box 3, and the upper end of the output pipe 3 is fixedly connected to the waste acid tank 2.

[0008] Preferably, an electric valve 1 is fixedly installed at the rear end of the waste acid tank 1, a delivery pipe 1 is fixedly installed at the rear end of the electric valve 1, and one end of the delivery pipe 1 is fixedly connected to the water purifier raw material pipe.

[0009] Preferably, an electric valve 2 is fixedly installed on one side of the waste acid pool 2, a delivery pipe 3 is fixedly installed on one side of the electric valve 2, one end of the delivery pipe 3 is fixedly connected to the water purifier raw material pipe, a delivery pipe 2 is fixedly installed on one side of the waste acid recovery device, one end of the delivery pipe 2 is fixedly connected to the water purifier raw material pipe, and an output pipe is fixedly installed on the rear end of the waste acid recovery device.

[0010] Preferably, the post-treatment tank includes a water washing chamber one, a water washing chamber two, an ammonia water treatment chamber and a water washing chamber three, a water outlet pipe is fixedly installed below the front end of the post-treatment tank, the water outlet pipe is connected with the water washing chamber two, a pump box five is arranged at the front end of the water outlet pipe, a return pipe is arranged on one side of the pump box five, a water storage tank is fixedly installed at one end of the return pipe, and a water injection pipe is fixedly installed above the water storage tank.

[0011] Preferably, pump boxes four are symmetrically arranged below both sides of the water storage tank, and water supply pipes are arranged on the outer sides of the two pump boxes four. One end of the two water supply pipes is fixedly connected to the water washing tank one and the water washing tank two, respectively.

[0012] Preferably, a discharge pipe 1 is arranged below the front end of the pre-treatment tank, a discharge pipe 2 is arranged below the front end of the water washing tank 1, a discharge pipe 3 is arranged below the front end of the water washing tank 2, a discharge pipe 4 is arranged below the front end of the chemical treatment tank, and a discharge pipe 5, a discharge pipe 6 and a discharge pipe 7 are respectively arranged below the front end of the post-treatment tank.

[0013] Preferably, electric valves three are installed at the connections between the discharge pipe one, the discharge pipe two, the discharge pipe three, the discharge pipe four, the discharge pipe five, the discharge pipe six and the discharge pipe seven and the pre-treatment tank, the water washing tank one, the water washing tank two, the chemical treatment tank and the post-treatment tank respectively.

[0014] Preferably, the discharge pipe five is connected to the water washing chamber one, the discharge pipe six is ​​connected to the ammonia water treatment chamber, and the discharge pipe seven is connected to the water washing chamber three.

[0015] A method for preparing a formed foil for a low-voltage high-dielectric aluminum electrolytic capacitor comprises the following steps:

[0016] S1: Put the raw material aluminum foil of the chemical foil into the pretreatment tank 1, and inject 3% to 5% phosphoric acid liquid into the tank for pretreatment;

[0017] S2: The aluminum foil treated in the pre-treatment tank is transferred to a water washing tank 1, into which water is injected to wash away the phosphoric acid liquid and impurities on the surface of the aluminum foil;

[0018] S3: The washed aluminum foil is then placed in the three etching chambers of the middle treatment tank 3, wherein the etching chamber 1 301 and the etching chamber 2 302 are both injected with a mixture of 16% hydrochloric acid and 1% sulfuric acid, and the etching chamber 3 303 is injected with a mixture of 16% hydrochloric acid, 1% sulfuric acid and 0.5% oxalic acid, for etching treatment;

[0019] S4: the chemically formed foil raw material is then transferred to the second water washing tank and washed with water to remove the residual chemical substances in the middle treatment tank;

[0020] S5: Then the chemically formed foil raw material is sent to the chemical treatment tank 5, into which 3% nitric acid liquid is injected for chemical treatment;

[0021] S6: then the chemically treated foil raw material is sent to a post-treatment tank, and is sequentially subjected to two water washings, ammonia water post-treatment, and water washing again;

[0022] S7: After all the treatments are completed in the post-treatment tank, the chemical foil raw material is dried to remove moisture on the surface of the aluminum foil, and the chemical foil raw material is sent to the chemical process for subsequent processing.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The present invention ingeniously arranges the first, second and third etching chambers in the middle processing tank, and injects acid solutions of different proportions into the etching chambers to perform etching treatment on the raw materials of the chemical foil, thereby more accurately controlling the corrosion depth and uniformity, thereby improving the specific surface area and capacitance performance of the chemical foil, and is equipped with a waste acid pool 1, a waste acid pool 2 and a waste acid recovery device, thereby realizing the classified collection and management of waste acid. The waste acid recovery device can recycle the mixed solution of hydrochloric acid, sulfuric acid and oxalic acid in the waste acid of the corrosion chamber 3, which not only significantly reduces the discharge of waste acid and effectively reduces the environmental burden, but also further reduces the production cost and improves the resource utilization rate. In addition, by arranging a water purifier raw material pipe, the aluminum-containing waste water treated by the waste acid recovery device and the excess waste acid of the waste acid pool 1 and the waste acid pool 2 can be input into the water purifier workshop together for the production of water purifier, thereby further improving the utilization value of the waste acid, realizing the resource recycling of the waste acid, and greatly improving the environmental protection performance and economic benefits.

[0025] (2) The post-processing tank of the present invention includes a water washing chamber 1, a water washing chamber 2, an ammonia water treatment chamber and a water washing chamber 3, which realizes further cleaning and surface treatment of the chemical foil, which is beneficial to improving the quality of the chemical foil. This multi-chamber post-processing design can more comprehensively remove surface residues and impurities in the production process of the chemical foil, improve the purity and quality of the product, and the alternating use of the water washing chamber and the ammonia water treatment chamber can realize rapid and effective cleaning and passivation treatment of the chemical foil, thereby improving production efficiency.

[0026] (3) The present invention forms a water recycling system by means of the water outlet pipe, pump box five, return pipe, water storage tank, pump box four and water supply pipe. In this system, the water used in the water washing chamber two can be effectively recycled and resupplied to the water washing tank one and the water washing tank two through the water supply pipe for subsequent cleaning operations. This design not only improves the full utilization rate of the water body and reduces the waste of water resources, but also helps to maintain the stability and efficiency of the entire corrosion process. At the same time, it also embodies the concept of environmental protection and sustainable development and increases practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a device for preparing a formed foil for a low-voltage high-dielectric aluminum electrolytic capacitor according to the present invention;

[0028] Figure 2 It is a structural schematic diagram of the middle treatment tank, the first waste acid pool, the second waste acid pool and the waste acid recovery device from the right side of the present invention;

[0029] Figure 3 It is a structural schematic diagram of the middle treatment tank, the first waste acid pool, the second waste acid pool and the waste acid recovery device from the left side of the present invention;

[0030] Figure 4It is an enlarged schematic diagram of the A part of the present invention;

[0031] Figure 5 It is a schematic diagram of the process of the present invention.

[0032] In the figure: 1, pre-treatment tank; 2, water washing tank 1; 3, intermediate treatment tank; 301, etching chamber 1; 302, etching chamber 2; 303, etching chamber 3; 4, water washing tank 2; 5, chemical treatment tank; 6, post-treatment tank; 601, water washing chamber 1; 602, water washing chamber 2; 603, ammonia treatment chamber; 604, water washing chamber 3; 7, waste acid tank 1; 8, waste acid tank 2; 9, waste acid recovery device; 10, pump box 1; 11, recovery pipe 1; 12, output pipe 1; 13, pump box 2; 14, recovery pipe 2; 15, output pipe 2; 16, pump box 3; 17. Recovery pipe three; 18. Output pipe three; 19. Electric valve one; 20. Delivery pipe one; 21. Delivery pipe two; 22. Electric valve two; 23. Delivery pipe three; 24. Water purifier raw material pipe; 25. Output pipe; 26. Discharge pipe one; 27. Discharge pipe two; 28. Discharge pipe three; 29. ​​Discharge pipe four; 30. Discharge pipe five; 31. Discharge pipe six; 32. Discharge pipe seven; 33. Electric valve three; 34. Water storage tank; 35. Water injection pipe; 36. Pump box four; 37. Water supply pipe; 38. Return pipe; 39. Pump box five; 40. Water outlet pipe. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] See also Figure 1-5The present invention provides an embodiment: a low-voltage high-dielectric aluminum electrolytic capacitor chemical foil preparation device, comprising a corrosion treatment tank body, the corrosion treatment tank body comprising a pre-treatment tank 1, a water washing tank 2, a middle treatment tank 3, a water washing tank 4, a chemical treatment tank 5 and a post-treatment tank 6, the pre-treatment tank 1 is injected with 3% to 5% phosphoric acid liquid, the water washing tank 2 and the water washing tank 4 are injected with water for cleaning operations, the chemical treatment tank 5 is injected with 3% nitric acid liquid, and the inside of the middle treatment tank 3 is respectively provided with There are corrosion chamber 1 301, corrosion chamber 2 302 and corrosion chamber 3 303, and corrosion chamber 1 301 and corrosion chamber 2 302 are injected with a mixture of 16% hydrochloric acid and 1% sulfuric acid, and corrosion chamber 3 303 is injected with a mixture of 16% hydrochloric acid, 1% sulfuric acid and 0.5% oxalic acid. A waste acid tank 1 7 is arranged on one side of the rear end of the middle treatment tank 3, and a waste acid tank 2 8 is arranged on the other side of the rear end of the middle treatment tank 3. A waste acid recovery device 9 is fixedly installed at the rear end of the waste acid tank 2 8, and one side of the waste acid recovery device 9 A water purifier raw material pipe 24 is provided, and the water purifier raw material pipe 24 is externally connected to the water purifier production equipment of the water purifier workshop. A recovery pipe 1 11, a recovery pipe 2 14 and a recovery pipe 3 17 are fixedly installed at the rear end of the middle treatment tank 3. The recovery pipe 1 11, the recovery pipe 2 14 and the recovery pipe 3 17 are respectively connected to the corrosion chamber 1 301, the corrosion chamber 2 302 and the corrosion chamber 3 303. A pump box 10 is provided at one end of the recovery pipe 11, and an output pipe 12 is provided above the pump box 10. The output pipe 1 The upper end of pipe 12 is fixedly connected to waste acid pool 1 7, one end of recovery pipe 2 14 is provided with pump box 2 13, above pump box 2 13 is provided with output pipe 2 15, the upper end of output pipe 2 15 is fixedly connected to waste acid pool 1 7, one end of recovery pipe 3 17 is provided with pump box 3 16, above pump box 3 16 is provided with output pipe 3 18, the upper end of output pipe 3 18 is fixedly connected to waste acid pool 2 8, pump box 10, pump box 2 13 and pump box 3 16 are all provided with delivery pumps for delivering waste acid.

[0035] By cleverly arranging the etching chamber 1 301, the etching chamber 2 302 and the etching chamber 3 303 in the middle processing tank 3, and injecting acid solutions of different proportions respectively to carry out etching treatment of the chemical foil raw material, the corrosion depth and uniformity can be controlled more accurately, thereby improving the specific surface area and capacitance performance of the chemical foil. A waste acid pool 1 7, a waste acid pool 2 8 and a waste acid recovery device 9 are provided, thereby realizing the classified collection and management of waste acid. The waste acid recovery device 9 can recycle the hydrochloric acid, sulfuric acid and oxalic acid mixture in the waste acid of the etching chamber 3 303, which not only significantly reduces the emission of waste acid and effectively reduces the environmental burden, but also further reduces the production cost and improves the resource utilization rate.

[0036] See also Figure 2 and Figure 3An electric valve 19 is fixedly installed at the rear end of the waste acid tank 7, a delivery pipe 20 is fixedly installed at the rear end of the electric valve 19, one end of the delivery pipe 20 is fixedly connected to the water purifier raw material pipe 24, an electric valve 22 is fixedly installed on one side of the waste acid tank 8, a delivery pipe 3 23 is fixedly installed on one side of the electric valve 22, one end of the delivery pipe 3 23 is fixedly connected to the water purifier raw material pipe 24, a delivery pipe 21 is fixedly installed on one side of the waste acid recovery device 9, one end of the delivery pipe 21 is fixedly connected to the water purifier raw material pipe 24, and an output pipe 25 is fixedly installed at the rear end of the waste acid recovery device 9.

[0037] By setting the electric valve 19 and the electric valve 22, the output of the waste acid in the waste acid pool 1 7 and the waste acid pool 2 8 can be adjusted, which increases the practicality, and by setting the water purification agent raw material pipe 24, the aluminum-containing waste water treated by the waste acid recovery device 9 and the excess waste acid in the waste acid pool 1 7 and the waste acid pool 2 8 can be input into the water purification agent workshop for the production of water purification agent, which further improves the utilization value of the waste acid, realizes the resource recycling of the waste acid, and greatly improves the environmental protection performance and economic benefits.

[0038] See also Figure 1 The post-treatment tank 6 includes a water washing chamber 1 601, a water washing chamber 2 602, an ammonia treatment chamber 603 and a water washing chamber 3 604. The water washing chamber 1 601, the water washing chamber 2 602 and the water washing chamber 3 604 are all injected with pure water, and the ammonia treatment chamber 603 is injected with 0.05% ammonia liquid. A water outlet pipe 40 is fixedly installed below the front end of the post-treatment tank 6. The water outlet pipe 40 is connected to the water washing chamber 2 602. A pump box 5 39 is arranged at the front end of the water outlet pipe 40. The pump box 5 39 is provided with a pump box 5 39. A return pipe 38 is provided on one side of 9, a water storage tank 34 is fixedly installed at one end of the return pipe 38, a water injection pipe 35 is fixedly installed above the water storage tank 34, pump boxes four 36 are symmetrically provided below both sides of the water storage tank 34, and delivery pumps are provided inside the pump boxes four 36 and the pump boxes five 39 for transporting water, and water supply pipes 37 are provided on the outer sides of the two pump boxes four 36, and one ends of the two water supply pipes 37 are fixedly connected to the washing tank one 2 and the washing tank two 4 respectively.

[0039] The post-processing tank 6 includes a water washing chamber 1 601, a water washing chamber 2 602, an ammonia water treatment chamber 603 and a water washing chamber 3 604, which realizes further cleaning and surface treatment of the chemical foil, which is beneficial to improving the quality of the chemical foil. This multi-chamber post-processing design can more comprehensively remove surface residues and impurities in the production process of the chemical foil, improve the purity and quality of the product, and the alternating use of the water washing chamber and the ammonia water treatment chamber can realize rapid and effective cleaning and passivation treatment of the chemical foil, thereby improving production efficiency.

[0040] A water recycling system is formed by the water outlet pipe 40, pump box five 39, return pipe 38, water storage tank 34, pump box four 36 and water supply pipe 37. In this system, the used water in the water washing chamber two 602 can be effectively recovered and re-supplied to the water washing tank one 2 and the water washing tank two 4 through the water supply pipe 37 for subsequent cleaning operations. This design not only improves the full utilization rate of the water body and reduces the waste of water resources, but also helps to maintain the stability and efficiency of the entire corrosion process.

[0041] See also Figure 1 and Figure 4 A discharge pipe 26 is arranged below the front end of the pre-treatment tank 1, a discharge pipe 27 is arranged below the front end of the water washing tank 2, a discharge pipe 3 28 is arranged below the front end of the water washing tank 4, a discharge pipe 4 29 is arranged below the front end of the chemical treatment tank 5, and a discharge pipe 5 30, a discharge pipe 6 31 and a discharge pipe 7 32 are respectively arranged below the front end of the post-treatment tank 6. The connection points of the discharge pipe 1 26, the discharge pipe 2 27, the discharge pipe 3 28, the discharge pipe 4 29, the discharge pipe 5 30, the discharge pipe 6 31 and the discharge pipe 7 32 with the pre-treatment tank 1, the water washing tank 1 2, the water washing tank 2 4, the chemical treatment tank 5 and the post-treatment tank 6 are respectively installed with an electric valve 33. The discharge pipe 5 30 is connected with the water washing chamber 1 601, the discharge pipe 6 31 is connected with the ammonia treatment chamber 603, and the discharge pipe 7 32 is connected with the water washing chamber 3 604.

[0042] By setting up discharge pipe 1 26, discharge pipe 2 27, discharge pipe 3 28, discharge pipe 4 29, discharge pipe 5 30, discharge pipe 6 31 and discharge pipe 7 32 and installing electric valve 3 33 on each discharge pipe, precise discharge control of the liquid in each treatment tank is achieved, thus avoiding liquid waste and environmental pollution, and the discharge operation can be performed on a certain treatment tank alone without affecting the normal operation of other treatment tanks.

[0043] A method for preparing a formed foil for a low-voltage high-dielectric aluminum electrolytic capacitor comprises the following steps:

[0044] S1: Put the raw material aluminum foil of the chemical foil into the pretreatment tank 1, and inject 3% to 5% phosphoric acid liquid into the tank for pretreatment;

[0045] S2: The aluminum foil treated in the pretreatment tank 1 is transferred to the water washing tank 2, into which water is injected to wash away the phosphoric acid liquid and impurities on the surface of the aluminum foil;

[0046] S3: The washed aluminum foil is then placed in the three etching chambers of the middle treatment tank 3, wherein the etching chamber 1 301 and the etching chamber 2 302 are both injected with a mixture of 16% hydrochloric acid and 1% sulfuric acid, and the etching chamber 3 303 is injected with a mixture of 16% hydrochloric acid, 1% sulfuric acid and 0.5% oxalic acid, for etching treatment;

[0047] S4: the chemically formed foil raw material is transferred to the water washing tank 2 4 and washed with water to remove the residual chemical substances in the middle treatment tank 3;

[0048] S5: Then the chemically formed foil raw material is sent to the chemical treatment tank 5, into which 3% nitric acid liquid is injected for chemical treatment;

[0049] S6: the chemically treated foil raw material is then sent to a post-treatment tank 6, and is sequentially subjected to two water washings, ammonia water post-treatment, and water washing again;

[0050] S7: After all the treatments are completed in the post-treatment tank 6, the chemical foil raw material is dried to remove moisture on the surface of the aluminum foil, and the chemical foil raw material is sent to the chemical process for subsequent processing.

[0051] The method firstly performs a preliminary chemical treatment on the aluminum foil by phosphoric acid liquid in a pretreatment tank 1, which can effectively remove oil and oxide on the surface of the aluminum foil, laying a good foundation for subsequent steps. The subsequent washing step in the washing tank 1 ensures that the phosphoric acid liquid and impurities on the surface of the aluminum foil are thoroughly cleaned, avoiding the interference of impurities on subsequent treatment steps. Three corrosion chambers are used in the middle treatment tank 3, and mixed liquids with different components are respectively injected for corrosion treatment. This multi-stage and multi-component corrosion method can more accurately control the corrosion depth and uniformity, thereby improving the specific surface area and capacitance performance of the chemical foil. At the same time, the oxalic acid added in the corrosion chamber 3 can further improve the uniformity and fineness of the corrosion, so that the electrical performance of the chemical foil is more excellent. After nitric acid treatment in the chemical treatment tank 5, multiple water washings in the post-treatment tank 6, ammonia water post-treatment and water washing again, the residual chemical substances and impurities on the surface of the aluminum foil can be further removed, and the flatness and stability of the chemical foil are improved. The drying treatment ensures that the moisture on the surface of the chemical foil raw material is completely removed, avoiding the influence of moisture on subsequent processing and capacitor performance.

[0052] Working principle: When in use, the raw material aluminum foil of the chemical foil is placed in the pretreatment tank 1, and 3% to 5% phosphoric acid liquid is injected into the tank for pretreatment. The aluminum foil treated in the pretreatment tank 1 is transferred to the water washing tank 2, and water is injected into the tank to wash away the phosphoric acid liquid and impurities on the surface of the aluminum foil. The washed aluminum foil is then placed in the three etching chambers of the middle treatment tank 3, wherein the etching chamber 1 301 and the etching chamber 2 302 are both injected with a mixture of 16% hydrochloric acid and 1% sulfuric acid, and the etching chamber 3 303 is injected with a mixture of 16% hydrochloric acid, 1% sulfuric acid, and 0.5% oxalic acid. Liquid is used for corrosion treatment, and then the chemical foil raw material is transferred to the water washing tank 2 4, and washed with water to remove the residual chemical substances in the intermediate treatment tank 3. Then the chemical foil raw material is sent to the chemical treatment tank 5, and 3% nitric acid liquid is injected into the tank for chemical treatment. Then the chemically treated chemical foil raw material is sent to the post-treatment tank 6, and two water washings, ammonia post-treatment and water washing again are carried out in sequence. After all treatments are completed in the post-treatment tank 6, the chemical foil raw material is dried to remove moisture on the surface of the aluminum foil, and then the chemical foil raw material is sent to the chemical process for subsequent processing.

[0053] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A device for preparing formed foil for low voltage high dielectric aluminum electrolytic capacitors, comprising an etching treatment tank, characterized in that: The corrosion treatment tank body comprises a pre-treatment tank (1), a water washing tank 1 (2), a middle treatment tank (3), a water washing tank 2 (4), a chemical treatment tank (5) and a post-treatment tank (6); the middle treatment tank (3) is provided with a corrosion chamber 1 (301), a corrosion chamber 2 (302) and a corrosion chamber 3 (303) respectively; a waste acid tank 1 (7) is provided at one side of the rear end of the middle treatment tank (3); a waste acid tank 2 (8) is provided at the other side of the rear end of the middle treatment tank (3); a waste acid recovery device (9) is fixedly installed at the rear end of the waste acid tank 2 (8); and a water purification agent raw material pipe (24) is provided at one side of the waste acid recovery device (9).

2. The device for preparing a low-voltage high-dielectric aluminum electrolytic capacitor foil according to claim 1, characterized in that: A recovery pipe 1 (11), a recovery pipe 2 (14) and a recovery pipe 3 (17) are fixedly installed at the rear end of the middle treatment tank (3), and the recovery pipe 1 (11), the recovery pipe 2 (14) and the recovery pipe 3 (17) are respectively connected to the corrosion chamber 1 (301), the corrosion chamber 2 (302) and the corrosion chamber 3 (303). A pump box 1 (10) is arranged at one end of the recovery pipe 1 (11), and an output pipe 1 (12) is arranged above the pump box 1 (10). The output pipe 1 (12) is connected to the corrosion chamber 1 (301), the corrosion chamber 2 (302) and the corrosion chamber 3 (303). The upper end of the recovery pipe 2 (14) is fixedly connected to the waste acid pool 1 (7); one end of the recovery pipe 2 (14) is provided with a pump box 2 (13); an output pipe 2 (15) is provided above the pump box 2 (13); the upper end of the output pipe 2 (15) is fixedly connected to the waste acid pool 1 (7); one end of the recovery pipe 3 (17) is provided with a pump box 3 (16); an output pipe 3 (18) is provided above the pump box 3 (16); the upper end of the output pipe 3 (18) is fixedly connected to the waste acid pool 2 (8).

3. The device for preparing a low voltage and high dielectric constant aluminum electrolytic capacitor foil according to claim 2, characterized in that: An electric valve (19) is fixedly installed at the rear end of the waste acid tank (7), and a delivery pipe (20) is fixedly installed at the rear end of the electric valve (19), and one end of the delivery pipe (20) is fixedly connected to a water purification agent raw material pipe (24).

4. The device for preparing a low voltage and high dielectric constant aluminum electrolytic capacitor foil according to claim 3, characterized in that: A second electric valve (22) is fixedly installed on one side of the second waste acid pool (8), a third delivery pipe (23) is fixedly installed on one side of the second electric valve (22), one end of the third delivery pipe (23) is fixedly connected to a water purifier raw material pipe (24), a second delivery pipe (21) is fixedly installed on one side of the waste acid recovery device (9), one end of the second delivery pipe (21) is fixedly connected to a water purifier raw material pipe (24), and an output pipe (25) is fixedly installed at the rear end of the waste acid recovery device (9).

5. The device for preparing a low voltage and high dielectric constant aluminum electrolytic capacitor foil according to claim 1, characterized in that: The post-treatment tank (6) comprises a water washing chamber 1 (601), a water washing chamber 2 (602), an ammonia water treatment chamber (603) and a water washing chamber 3 (604). A water outlet pipe (40) is fixedly installed below the front end of the post-treatment tank (6). The water outlet pipe (40) is connected to the water washing chamber 2 (602). A pump box 5 (39) is arranged at the front end of the water outlet pipe (40). A return pipe (38) is arranged on one side of the pump box 5 (39). A water storage tank (34) is fixedly installed at one end of the return pipe (38). A water injection pipe (35) is fixedly installed above the water storage tank (34).

6. The device for preparing a low voltage and high dielectric constant aluminum electrolytic capacitor foil according to claim 5, characterized in that: Pump boxes (36) are symmetrically arranged below both sides of the water storage tank (34), and water supply pipes (37) are arranged on the outsides of the two pump boxes (36). One end of the two water supply pipes (37) is fixedly connected to the first water washing tank (2) and the second water washing tank (4), respectively.

7. The device for preparing a low voltage and high dielectric constant aluminum electrolytic capacitor foil according to claim 6, characterized in that: A discharge pipe 1 (26) is arranged below the front end of the pre-treatment tank (1), a discharge pipe 2 (27) is arranged below the front end of the water washing tank (2), a discharge pipe 3 (28) is arranged below the front end of the water washing tank (4), a discharge pipe 4 (29) is arranged below the front end of the chemical treatment tank (5), and a discharge pipe 5 (30), a discharge pipe 6 (31) and a discharge pipe 7 (32) are respectively arranged below the front end of the post-treatment tank (6).

8. The device for preparing a low voltage and high dielectric constant aluminum electrolytic capacitor foil according to claim 7, characterized in that: Electric valves three (33) are installed at the connection points of the discharge pipe one (26), the discharge pipe two (27), the discharge pipe three (28), the discharge pipe four (29), the discharge pipe five (30), the discharge pipe six (31) and the discharge pipe seven (32) with the pre-treatment tank (1), the water washing tank one (2), the water washing tank two (4), the chemical treatment tank (5) and the post-treatment tank (6), respectively.

9. The device for preparing a formed foil for a low-voltage high-dielectric aluminum electrolytic capacitor according to claim 8, characterized in that: The discharge pipe five (30) is connected to the water washing chamber one (601), the discharge pipe six (31) is connected to the ammonia water treatment chamber (603), and the discharge pipe seven (32) is connected to the water washing chamber three (604).

10. A method for preparing a formed foil for a low-voltage high-dielectric aluminum electrolytic capacitor, which is realized based on the device for preparing a formed foil for a low-voltage high-dielectric aluminum electrolytic capacitor according to claims 1-9, characterized in that: The steps include: S1: placing the raw material aluminum foil of the chemical foil into a pretreatment tank (1), into which 3% to 5% phosphoric acid liquid is injected for pretreatment; S2: transferring the aluminum foil treated in the pre-treatment tank (1) to a water washing tank (2), into which water is injected to wash away the phosphoric acid liquid and impurities on the surface of the aluminum foil; S3: The washed aluminum foil is then placed in the three etching chambers of the middle treatment tank (3), wherein the etching chamber 1 (301) and the etching chamber 2 (302) are both injected with a mixture of 16% hydrochloric acid and 1% sulfuric acid, and the etching chamber 3 (303) is injected with a mixture of 16% hydrochloric acid, 1% sulfuric acid and 0.5% oxalic acid, for etching treatment; S4: the chemically formed foil raw material is then transferred to the second water washing tank (4) and washed with water to remove the residual chemical substances in the middle treatment tank (3); S5: Then the chemically formed foil raw material is sent to a chemical treatment tank (5), into which 3% nitric acid liquid is injected for chemical treatment; S6: then the chemically treated foil raw material is sent to a post-treatment tank (6), and is sequentially subjected to two water washings, ammonia water post-treatment and another water washing treatment; S7: After all the treatments are completed in the post-treatment tank (6), the chemical foil raw material is dried to remove moisture on the surface of the aluminum foil, and the chemical foil raw material is sent to the chemical process for subsequent processing.

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