An on-line acid mist recovery device for an electrolytic foil making machine

Abstract

The application discloses an online acid mist recovery device of an electrolytic foil machine, belongs to the technical field of electrolytic copper foil production, and aims to solve the problems of difficult maintenance, high environmental protection cost, inability to recover effective components of sulfuric acid and copper sulfate, easy corrosion of equipment and influence on copper foil quality of existing acid mist treatment equipment. The device comprises an acid mist sealing cover, an acid mist air pipe with negative pressure, a Z-shaped reflux air pipe and an acid mist recovery and reflux assembly. The assembly is internally provided with front and rear deposition cavities and front and rear fan impellers arranged in an axial and side-by-side mode, is matched with a water diversion distribution pipe, a transition cavity and a fan protective cover, the impeller blades are provided with an acid mist water collection structure, and the central guide column is provided with an annular chamfer. The application realizes secondary centrifugal crystallization, the effective components of the acid mist are directly refluxed into an electrolyte system through a drainage port, the water diversion distribution pipe prevents the impeller from being blocked, the maintenance cost is reduced, equipment corrosion and copper foil quality defects are avoided, and environmental protection, economic benefits and product quality are considered.

Description

Technical Field

[0001] This invention relates to the field of electrolytic copper foil production equipment technology, specifically to an online acid mist recovery device for an electrolytic copper foil production machine. Background Technology

[0002] The electrolytic copper foil production machine is the main equipment for the production of electrolytic copper foil. It mainly consists of an anode tank, a cathode roller, a winding roller, an acid mist extraction system, and a post-processing unit. Its working principle is as follows: a saturated copper sulfate electrolyte at a preset temperature is fed into the electrolytic tank. Under the action of low-voltage high DC current, copper ions are continuously electroplated onto the surface of the rotating cathode roller to form copper foil. The copper foil is then pickled, washed, peeled, treated with anti-oxidation, dried, and wound up to obtain the finished product.

[0003] During the production process, the high-concentration sulfuric acid electrolyte in the electrolytic cell will continuously volatilize when heated by electricity, including sulfuric acid mist (i.e., H2SO4 aerosol) and copper sulfate droplets. Existing acid mist treatment systems mainly consist of a collection hood or sealing hood, exhaust pipes, valves, fans, and scrubbing towers. Some existing technologies have added automatic pipe cleaning devices, which are only used to alleviate the problem of pipe crystallization.

[0004] Existing acid mist treatment technologies have the following drawbacks: 1. After the acid mist is collected by the exhaust fan, it is sent to the scrubbing tower for internal and external discharge. The exhaust pipe is prone to crystallization and blockage, making equipment maintenance difficult. The filter media in the scrubbing tower needs to be replaced regularly, and the crystallization and flushing of the pipes will generate a large amount of industrial wastewater, resulting in high environmental treatment costs.

[0005] 2. Effective production components such as sulfuric acid and copper sulfate in acid mist are not recovered. Direct neutralization treatment results in waste of raw materials and requires the consumption of alkali solution and adsorbent particles, which greatly increases production costs.

[0006] 3. If acid mist is not recovered at the source, it is easy to drip and form acid mist spots, which will not only corrode the foil production equipment, but also cause major quality defects such as oxidation spots and black spots on the copper foil surface. Summary of the Invention

[0007] This invention provides an online acid mist recovery device for an electrolytic foil production machine, which can solve the problems of high maintenance difficulty, high environmental treatment cost, and failure to recover effective production components such as sulfuric acid and copper sulfate in existing acid mist treatment technologies.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an online acid mist recovery device for an electrolytic foil production machine, comprising an acid mist sealing cover installed on the upper side of the electrolytic cell, wherein multiple return air ducts are installed on the acid mist sealing cover, and each return air duct is connected to an acid mist duct with its own negative pressure. An acid mist recovery and return assembly is installed at one end of each return air duct located on the upper side of the electrolytic cell. The acid mist recovery and return assembly includes an acid mist crystallization water pre-deposition chamber and an acid mist crystallization water post-deposition chamber arranged axially side-by-side. A front drain outlet and a rear drain outlet are respectively provided at the bottom of the acid mist crystallization water pre-deposition chamber and the acid mist crystallization water post-deposition chamber. The acid mist crystallization water post-deposition chamber has a rear fan impeller axially positioned between the front and rear drain outlets. A front fan impeller is installed on the front side of the front drain outlet in the acid mist crystallization water pre-deposition chamber. A return air duct connects the acid mist sealing cover to the negative pressure acid mist duct, utilizing the existing system's negative pressure as a power source, eliminating the need for an external motor, thus reducing energy consumption and modification costs. The front and rear deposition chambers provide cooling and crystallization space for the acid mist, receiving the crystallized water separated by centrifugation to achieve solid-liquid or gas-liquid separation. Simultaneously, the front and rear drain outlets directly return the crystallized water to the electrolyte system, recovering sulfuric acid and copper sulfate, thus solving the problem of raw material waste.

[0009] Preferably, the acid mist recovery and reflux assembly is further provided with a water distribution pipe. The water distribution pipe is connected to a flushing liquid, which is supplied in a directional manner to wet the crystals on the impeller surface, preventing high-concentration copper sulfate crystals from clogging the impeller. The flushing liquid drips down by its own weight to flush the impeller, preventing the impeller rotation from being obstructed. At the same time, it dilutes the crystals and allows them to flow smoothly into the deposition chamber, solving the problems of easy crystallization and clogging of existing impellers and poor operation. It eliminates the need for frequent manual cleaning and reduces maintenance costs.

[0010] Preferably, a transition cavity is detachably installed on the axial front side of the acid mist crystallization water pre-deposition chamber, and a fan guard is detachably installed on the axial front side of the transition cavity. The front fan impeller is installed in the transition cavity. The transition cavity provides installation space for the front fan impeller, realizing structural transition and sealing. The fan guard can block impurities from entering the impeller and protect the impeller from normal operation.

[0011] Preferably, both ends of the transition cavity are connected to the fan guard and the pre-deposition chamber of acid mist crystallization water by threads, which provides good sealing performance and eliminates the need for special tools for disassembly and assembly. This ensures that the cavity is sealed to prevent acid mist leakage and improves installation and maintenance efficiency, solving the problems of poor connection sealing and cumbersome disassembly and assembly in existing devices.

[0012] Preferably, both the transition cavity and the post-deposition cavity for acid mist crystallization water are equipped with impeller rotating bases. The impeller rotating bases have axially arranged central guide posts. The front fan impeller and the rear fan impeller are both sleeved on the corresponding central guide posts. The impeller rotating bases can fix and support the central guide posts to keep them in the center position, ensuring the axial stability of the guide posts. At the same time, the central guide posts provide rotational guidance for the impellers and limit the radial sway of the impellers.

[0013] Preferably, the root of the central guide post is provided with a step, and the end of the step that contacts the front fan impeller or the rear fan impeller is provided with an annular chamfer structure. The annular chamfer structure can reduce the rotational friction resistance of the impeller, reduce component wear, extend the service life of the impeller and the guide post, ensure the long-term stable operation of the impeller, and solve the problem of high rotational friction and easy damage of existing impellers.

[0014] Preferably, a baffle ring is provided on the side wall between the front drain and the rear drain in the acid mist crystallization water post-deposition chamber. The baffle ring can prolong the acid mist residence time, improve the cooling crystallization efficiency, guide the crystallization water to the drain, improve the reflux efficiency, and solve the problems of residual crystallization water and incomplete recovery in the existing deposition chamber.

[0015] Preferably, the radial tips of the blades of the front fan impeller and / or the rear fan impeller are provided with an acid mist collection structure. The acid mist collection structure includes arc-shaped baffles symmetrically arranged along the edge of the blades and an acid mist overflow port formed between the arc-shaped baffles. The arc-shaped baffles can intercept the acid mist ejected by centrifugation and prevent it from being sucked into the air duct by negative pressure. The acid mist collection structure can realize the directional collection and return of acid mist, solve the problem that existing acid mist is easily drawn into the pipeline and the recovery fails, and enhance the centrifugal recovery effect.

[0016] Preferably, the front fan impeller and / or rear fan impeller adopts a blade structure. The blades increase the acid mist contact area, improve the acid mist adsorption and centrifugal crystallization efficiency, adapt to the acid mist generation rate of the foil production machine, and solve the problem of insufficient processing capacity of existing impellers due to fewer blades.

[0017] Preferably, the return air duct adopts a Z-shaped structure, and the acid mist recovery and return component is set at the lower end of the return air duct. The Z-shaped return air duct can use gravity to ensure smooth return of crystal water without additional power, thereby improving the reliability of return and solving the problems of poor condensate return and pipe crystallization in existing devices.

[0018] Compared with the prior art, the beneficial effects of the present invention are: The device uses a centrifugal fan impeller to adsorb and crystallize the acid mist and recover it. It does not require any power source. The centrifugal fan rotates at high speed under the negative pressure of the original system's pipeline to adsorb the acid mist crystals. It also adopts a secondary centrifugal design, which can effectively recover and reuse the acid mist, thus playing a dual centrifugal recovery role. The fan blades are designed with an acid mist collection structure to prevent acid mist water, which is formed by mixing acid mist and water, from being sucked into the pipe by the negative pressure of the pipe. A flushing solution is introduced into the crystallization water deposition chamber. The flushing solution will continuously drip onto the impeller under its own weight in the distribution pipe, wetting the crystals and flushing them, and further recovering the acid mist crystals into the system. The acid mist from the copper foil production machine is adsorbed and directly recovered at the source. The main components of the acid mist do not need to be treated through pipelines and adsorption towers, thus solving the problem of waste of effective components in the acid mist and generating direct benefits to the quality of copper foil products and environmental safety. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the acid mist recovery and reflux assembly of the present invention; Figure 3 This is a cross-sectional view of the acid mist recovery and reflux assembly of the present invention; Figure 4 This is a perspective view of the front fan impeller and the rear fan impeller of the present invention.

[0020] Figure label: 1. Acid mist sealing cover; 2. Acid mist duct; 3. Water distribution pipe; 4. Acid mist recovery and recirculation assembly; 501. Acid mist crystallization water pre-deposition chamber; 502. Front fan impeller; 504. Fan protective cover; 505. Front drain outlet; 506. Recirculation duct; 507. Impeller rotating base; 508. Rear drain outlet; 509. Rear fan impeller; 510. Acid mist crystallization water post-deposition chamber; 511. Central guide column; 512. Baffle ring; 513. Annular chamfered structure; 514. Transition chamber; 515. Acid mist water collection structure; 516. Acid mist water overflow outlet. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0022] like Figure 1-4As shown, this invention provides a technical solution to address the problems of high maintenance difficulty, high environmental treatment cost, and lack of recovery of effective production components such as sulfuric acid and copper sulfate in existing acid mist treatment technologies and equipment. The solution is as follows: An online acid mist recovery device for an electrolytic foil production machine, comprising an acid mist sealing cover 1 installed on the upper side of the electrolytic cell. Multiple return air ducts 506 are installed on the acid mist sealing cover 1, each of which is connected to an acid mist duct 2 with its own negative pressure. An acid mist recovery and return assembly 4 is installed at one end of each return air duct 506 located on the upper side of the electrolytic cell. The acid mist recovery and return assembly 4 includes an acid mist crystallization water pre-deposition chamber 501 and an acid mist crystallization water post-deposition chamber 510 arranged axially side-by-side. A front drain outlet 505 and a rear drain outlet 508 are respectively provided at the bottom of the acid mist crystallization water pre-deposition chamber 501 and the acid mist crystallization water post-deposition chamber 510. A rear fan impeller 509 is axially arranged inside the post-crystallization chamber 510 between the front drain port 505 and the rear drain port 508. A front fan impeller 502 is installed on the front side of the front drain port 505 in the pre-crystallization chamber 501 for acid mist crystallization water. The return air duct 506 connects the acid mist sealing cover 1 and the negative pressure acid mist air duct 2. The original negative pressure of the system is used as a power source, eliminating the need for an external motor, reducing energy consumption and modification costs. The front and rear deposition chambers provide acid mist cooling and crystallization space, receiving crystallization water separated by centrifugation to achieve solid-liquid or gas-liquid separation. At the same time, the front and rear drain ports directly return the crystallization water to the electrolyte system to recover sulfuric acid and copper sulfate effective components, solving the problem of raw material waste. In addition, the front and rear deposition chambers are combined with the front and rear fan impellers to form a secondary centrifugal separation structure. The front impeller performs preliminary separation, and the rear impeller performs deep separation, which greatly improves the acid mist recovery efficiency and solves the problem of incomplete acid mist recovery in the existing technology.

[0023] Specifically, the acid mist sealing hood 1 can seal the upper space of the electrolytic cell, collect the volatile acid mist, prevent the unorganized diffusion of acid mist, and solve the problems of acid mist polluting the environment and corroding equipment. Three sets of return air ducts 506 can be evenly installed on the acid mist sealing hood 1, and the upper ends of all return air ducts 506 are sealed and connected to the equipment's own negative pressure acid mist duct 2. Both the front and rear fan impellers rotate freely under the negative pressure of the acid mist duct 2.

[0024] In this embodiment, the acid mist recovery and reflux assembly 4 is further equipped with a water distribution pipe 3. The water distribution pipe 3 is connected to a flushing liquid, which is supplied directionally to wet the crystals on the impeller surface, preventing high-concentration copper sulfate crystals from clogging the impeller. The flushing liquid drips down by its own weight to flush the impeller, preventing impeller rotation from being obstructed. At the same time, it dilutes the crystals, allowing them to flow smoothly into the deposition chamber, solving the problems of easy crystallization and clogging of existing impellers and poor operation. Frequent manual cleaning is not required, reducing maintenance costs. The flushing liquid can be pure water or reusable foil washing water. The inlet of the water distribution pipe 3 is connected to production pure water or foil washing recycled pure water, and the outlet is vertically aligned with the surface of the front fan impeller 502. Pure water continuously drips down onto the impeller under its own weight, wetting and rinsing the crystals.

[0025] In this embodiment, a transition cavity 514 is detachably installed on the axial front side of the acid mist crystallization water pre-deposition chamber 501. A fan guard 504 is detachably installed on the axial front side of the transition cavity 514. The front fan impeller 502 is installed inside the transition cavity 514. The transition cavity 514 provides installation space for the front fan impeller 502, achieving structural transition and sealing. The fan guard 504 can block impurities from entering the impeller and protect the impeller's normal operation. Both the transition cavity 514 and the fan guard 504 are cylindrical structures. A cross-shaped baffle is provided at the front end of the fan guard 504. The detachable connection structure of the three facilitates impeller inspection and replacement, improves the ease of disassembly and assembly of the device, and solves the problems of inconvenient maintenance and difficult disassembly and assembly of existing acid mist devices.

[0026] The two ends of the transition cavity 514 are connected to the fan guard 504 and the acid mist crystallization water pre-deposition cavity 501 by threads, which has good sealing performance and does not require special tools for disassembly and assembly. This not only ensures the cavity is sealed to prevent acid mist leakage, but also improves the efficiency of installation and maintenance, and solves the problems of poor connection sealing and cumbersome disassembly and assembly in existing devices.

[0027] In this embodiment, both the transition chamber 514 and the post-deposition chamber 510 for acid mist crystallization water are equipped with impeller rotating bases 507. Each impeller rotating base 507 has an axially arranged central guide post 511. The front fan impeller 502 and the rear fan impeller 509 are both fitted onto their respective central guide posts 511. The impeller rotating base 507 can fix and support the central guide post 511, keeping it in a central position and ensuring axial stability of the guide post. Simultaneously, the central guide post 511 provides rotational guidance for the impeller, limiting radial wobble. The impeller fitted onto the central guide post 511 has a simple assembly structure. Combined with negative pressure drive, it ensures smooth and stable impeller rotation, improves centrifugal separation effect, and solves the problems of unstable impeller rotation and low centrifugal efficiency in existing systems.

[0028] Among them, such as Figure 3As shown, the root of the central guide post 511 is provided with a step, and the end of the step that contacts the front fan impeller 502 or the rear fan impeller 509 is provided with an annular chamfer structure 513. The annular chamfer structure 513 can reduce the rotational friction resistance of the impeller, reduce component wear, extend the service life of the impeller and the guide post, ensure the long-term stable operation of the impeller, and solve the problem of high rotational friction and easy damage of existing impellers. Specifically, the root of the front and rear central guide posts 511 is machined with an annular step, and the contact end face of the step with the impeller is machined with an R3mm annular chamfer structure 513. The bushing end face of the front and rear fan impellers fits and rotates in contact with the annular chamfer, without rigid friction.

[0029] In this embodiment, a baffle ring 512 is provided on the side wall of the acid mist crystallization water post-deposition chamber 510 between the front drain port 505 and the rear drain port 508. The baffle ring 512 can prolong the acid mist residence time and improve the cooling crystallization efficiency; it guides the crystallization water to collect at the drain port, improving the reflux efficiency and solving the problems of residual crystallization water and incomplete recovery in existing deposition chambers. The baffle ring 512 can be installed separately or integrally formed with the acid mist crystallization water post-deposition chamber 510. The inner diameter of the baffle ring is smaller than the outer diameter of the rear fan impeller 509, forming a flow-limiting and water-blocking structure.

[0030] To better collect acid mist water, such as Figure 4 As shown, the radial tips of the blades of the front fan impeller 502 and / or the rear fan impeller 509 are provided with acid mist water collection structures 515. The acid mist water collection structure 515 includes arc-shaped baffles symmetrically arranged along the edge of the blades and acid mist water overflow ports 516 formed between the arc-shaped baffles. The arc-shaped baffles can intercept the acid mist water thrown out by centrifugation and prevent it from being sucked into the air duct by negative pressure. The acid mist water collection structure 515 can realize the directional collection and return of acid mist water, solve the problem that existing acid mist water is easily drawn into the pipeline and the recovery fails, and enhance the centrifugal recovery effect.

[0031] In this embodiment, the front fan impeller 502 and / or the rear fan impeller 509 adopt a 10-blade structure. The 10 blades increase the acid mist contact area, improve the acid mist adsorption and centrifugal crystallization efficiency, adapt to the acid mist generation rate of the foil production machine, and solve the problem of insufficient processing capacity of existing impellers with few blades. The blades can be made of PP polypropylene acid and alkali resistant blades.

[0032] In this embodiment, the return duct 506 adopts a Z-shaped structure, and the acid mist recovery and return component 4 is located at the lower end of the return duct 506. The Z-shaped return duct 506 can utilize gravity to ensure smooth return of crystallization water without additional power, improving return reliability and solving the problems of poor condensate return and pipe crystallization in existing devices. Specifically, the return duct 506 can adopt a Z-shaped bending structure made of PVC material. The lower end of the Z-shaped duct is horizontally set, and the acid mist recovery and return component 4 is fixedly installed at this lower end; the upper end of the Z-shaped duct is sealed and connected to the acid mist duct 2.

[0033] The specific working process in this embodiment is as follows: The acid mist volatilized from the electrolytic cell is collected by the acid mist sealing cover 1, and enters the fan protection cover 504 under the negative pressure of the acid mist duct 2, flowing to the front fan impeller 502 in the transition cavity 514.

[0034] The front impeller 502 rotates at high speed under negative pressure, and performs the first centrifugal cooling and crystallization on the acid mist. The crystallization water is intercepted by the blade collection structure and flows into the front deposition chamber 501 through the overflow port, and then flows back to the electrolyte system through the front drain port 505.

[0035] A small amount of unseparated acid mist enters the post-deposition chamber 510, where it is centrifuged and cooled a second time by the rear impeller 509 to crystallize. The crystallization water flows into the post-deposition chamber 510 and is returned to the electrolyte system through the rear drain outlet 508. The baffle ring 512 extends the residence time of the acid mist and improves the crystallization efficiency.

[0036] Meanwhile, a small amount of acid mist that leaks through the double impeller enters the Z-type return air duct 506, and after natural cooling, the condensate flows back to the rear drain outlet 508 by gravity.

[0037] While the impeller is in operation, pure water is continuously dripped into the water distribution pipe 3 to wet and rinse the crystals on the impeller surface, prevent impeller blockage, and ensure continuous operation.

[0038] This device requires no external power and relies on the existing negative pressure to achieve secondary centrifugal recovery of acid mist at the source. The effective components are directly returned to the electrolyte system, eliminating raw material waste. After eliminating the washing tower, there is no pipeline crystallization or flushing wastewater, reducing equipment maintenance costs. It eliminates acid mist dripping at the source, avoiding copper foil quality defects and equipment corrosion, and achieving multiple benefits in terms of environmental protection, economy, and product quality.

[0039] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0040] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their 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 and specifically defined.

[0041] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean 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.

[0042] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

Claims

1. An online acid mist recovery device for an electrolytic foil production machine, comprising an acid mist sealing cover (1) installed on the upper side of the electrolytic cell, characterized in that, The acid mist sealing cover (1) is equipped with multiple return air ducts (506), all of which are connected to the acid mist duct (2) with its own negative pressure. The end of the return air duct (506) located on the upper side of the electrolytic cell is equipped with an acid mist recovery and return assembly (4). The acid mist recovery and return assembly (4) includes an acid mist crystallization water pre-deposition chamber (501) and an acid mist crystallization water post-deposition chamber (510) arranged axially side by side. The bottom of the deposition chamber (501) and the acid mist crystallization water post-deposition chamber (510) are respectively provided with a front drain outlet (505) and a rear drain outlet (508). A rear fan impeller (509) is axially arranged inside the acid mist crystallization water post-deposition chamber (510) between the front drain outlet (505) and the rear drain outlet (508). A front fan impeller (502) is installed on the front side of the front drain outlet (505) of the acid mist crystallization water front deposition chamber (501).

2. The online acid mist recovery device for electrolytic foil production machine according to claim 1, characterized in that: The acid mist recovery and reflux assembly (4) is also provided with a water distribution pipe (3), which is connected to a flushing liquid.

3. The online acid mist recovery device for electrolytic foil production machine according to claim 2, characterized in that: The acid mist crystallization water pre-deposition chamber (501) is detachably mounted with a transition chamber (514) on its axial front side. The transition chamber (514) is detachably mounted with a fan guard (504) on its axial front side. The front fan impeller (502) is installed inside the transition chamber (514).

4. The online acid mist recovery device for electrolytic foil production machine according to claim 3, characterized in that: The two ends of the transition cavity (514) are connected to the fan shield (504) and the acid mist crystallization water pre-deposition cavity (501) by threads.

5. The online acid mist recovery device for electrolytic foil production machine according to claim 3, characterized in that: The transition cavity (514) and the acid mist crystallization water post-deposition cavity (510) are both equipped with impeller rotating bases (507). The impeller rotating bases (507) have axially arranged central guide posts (511). The front fan impeller (502) and the rear fan impeller (509) are both sleeved on the corresponding central guide posts (511).

6. The online acid mist recovery device for electrolytic foil production machine according to claim 5, characterized in that: The root of the central guide post (511) is provided with a step, and the end of the step that contacts the front fan impeller (502) or the rear fan impeller (509) is provided with an annular chamfer structure (513).

7. The online acid mist recovery device for electrolytic foil production machine according to claim 1, characterized in that: A retaining ring (512) is provided on the side wall between the front drain (505) and the rear drain (508) inside the acid mist crystallization water deposition chamber (510).

8. The online acid mist recovery device for electrolytic foil production machine according to any one of claims 1-7, characterized in that: The radial tips of the blades of the front fan impeller (502) and / or the rear fan impeller (509) are provided with acid mist water collection structures (515). The acid mist water collection structures (515) include arc-shaped baffles symmetrically arranged along the edge of the blades and acid mist water overflow ports (516) formed between the arc-shaped baffles.

9. The online acid mist recovery device for electrolytic foil production machine according to claim 8, characterized in that: The front fan impeller (502) and / or rear fan impeller (509) have a 10-blade structure.

10. The online acid mist recovery device for electrolytic foil production machine according to claim 8, characterized in that: The return air duct (506) adopts a Z-shaped structure, and the acid mist recovery and return component (4) is located at the lower end of the return air duct (506).

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