Continuous circulation acid preparation device for stainless steel pickling process

Abstract

The utility model discloses a continuous circulating acid preparation device for a stainless steel pickling process, and belongs to the technical field of metal surface treatment. According to the technical scheme, the continuous circulation acid preparation device for the stainless steel acid pickling process comprises an acid pickling tank, a plurality of acid pickling bins are arranged in the acid pickling tank at intervals, a circulating pump is arranged at the bottom of each acid pickling bin, and the input end and the output end of each circulating pump are connected with the acid pickling bins through guide pipes. A filtering assembly is arranged on an input end guide pipe of the circulating pump; according to the utility model, through the synergistic effect of the circulating pump in the pickling bin and the sliding acid preparation unit and the combination of the real-time PH detection and control unit, the dynamic balance adjustment of the acid liquor concentration is realized, and meanwhile, the high-efficiency filtration of the ceramic honeycomb filter element and the waste acid distillation recovery process are adopted; the problems of uneven acid liquor concentration, impurity deposition and low waste acid treatment efficiency in the traditional process are effectively solved, and the comprehensive advantages of improving the acid pickling quality, reducing the maintenance cost and reducing the environmental pollution are achieved.

Description

A continuous circulating acid preparation device for stainless steel pickling process Technical Field

[0001] This utility model belongs to the field of metal surface treatment technology, specifically relating to a continuous circulating acid mixing device for stainless steel pickling process. Background Technology

[0002] Stainless steel pickling is a crucial step in metal surface treatment, primarily used to remove oxide layers, rust, and impurities from stainless steel surfaces to improve their surface quality and corrosion resistance. Traditional pickling processes often employ a multi-stage pickling tank series connection, achieving pickling through sequential immersion. However, existing technologies still have the following problems:

[0003] Uneven acid concentration and low efficiency: Traditional pickling tanks typically operate independently, and the acid circulation system lacks dynamic adjustment capabilities, resulting in uneven distribution of pickling solution concentration. As the pickling process progresses, the acid activity gradually decreases, requiring frequent shutdowns to replenish new acid or replace the acid solution, which not only affects production efficiency but also easily leads to resource waste.

[0004] Impurity accumulation and equipment wear: Impurities such as metal particles and reaction products generated during pickling are prone to deposit at the bottom of the tank or circulate with the acid solution. Existing filtration systems mostly use fixed filter screens or single-stage filtration, which are prone to clogging and difficult to clean and maintain. Long-term operation will accelerate the wear of pumps and pipelines, increasing maintenance costs.

[0005] pH monitoring and acid preparation lag: In existing technologies, pH detection units are mostly fixed in a single location or operate offline, making it difficult to reflect the overall state of the acid solution in a timely manner, resulting in a lag in acid preparation adjustments. This reliance on manual intervention makes it difficult to achieve precise acid concentration control, affecting the consistency of pickling quality.

[0006] Low waste acid recovery rate and environmental issues: Traditional waste acid treatment often involves neutralization or simple precipitation, resulting in low resource recovery rates. Improper treatment of waste liquid containing heavy metals can easily lead to environmental pollution. Some recovery processes are complex, energy-intensive, and difficult to integrate efficiently with pickling systems.

[0007] In recent years, although some studies have attempted to optimize the process using circulating pumps or automatic acid mixing devices, problems still exist, such as insufficient flexibility of the acid mixing unit, low filtration efficiency, and imperfect waste acid regeneration technology. For example, some devices use a fixed acid mixing structure, which cannot adapt to the dynamic adjustment needs of multiple compartments; the combination of electrolytic treatment and condensation processes in waste acid distillation recovery has not been effectively applied, resulting in insufficient purity of regenerated acid.

[0008] To address the aforementioned issues, existing technologies urgently need improvement. Summary of the Invention

[0009] This invention provides a continuous circulating acid preparation device for stainless steel pickling processes, thereby solving at least one of the aforementioned technical problems.

[0010] The technical solution adopted in this utility model is as follows:

[0011] A continuous circulating acid preparation device for stainless steel pickling processes includes an pickling tank with several pickling chambers spaced apart within it. Each pickling chamber has a circulating pump at its bottom, and the input and output ends of the circulating pump are connected to the pickling chambers via conduits. A filter assembly is installed on the conduit at the input end of the circulating pump, and a pH detection unit is installed on either the input or output end of the circulating pump. The device also includes an acid preparation unit located above the pickling tank and slidably connected along the arrangement direction of the pickling chambers.

[0012] Furthermore, this application also proposes a control unit that controls the sliding of the acid mixing unit based on the detection value of the pH detection unit.

[0013] Furthermore, this application also proposes that the filter assembly includes a filter box, a filter element is provided inside the filter box, the filter element is a ceramic honeycomb filter element, and an inlet pipe and a drain pipe are provided on the filter box. The inlet pipe and the drain pipe are diagonally arranged on the outer walls of opposite sides of the filter box, and the inlet pipe and the drain pipe are respectively connected to adjacent conduit joints.

[0014] Furthermore, this application also proposes that the acid mixing unit includes a horizontal guide rail arranged along the length of the pickling tank, a support frame slidably connected to the horizontal guide rail, an acid mixing component provided on the support frame, and a hose connecting the acid mixing component to the acid storage tank.

[0015] Furthermore, this application also proposes that the acid mixing unit includes a vertical guide rail disposed in the middle of the support frame, an acid discharge pipe slidably connected on the vertical guide rail, a control valve disposed on the acid discharge pipe, and the control valve being electrically connected to the control unit.

[0016] Furthermore, this application also proposes that the support frame is equipped with a protective cover, and the acid drain pipe is located below the protective cover.

[0017] Furthermore, this application also proposes that the acid drain pipe slides along the vertical guide rail to have a first position located above the pickling tank and a second position located below the liquid surface inside the pickling tank.

[0018] Furthermore, this application also proposes that it includes a waste acid recovery component, wherein the output end of the circulation pump is connected to the waste acid recovery component and the conduit via a three-way valve.

[0019] Furthermore, this application also proposes that the waste acid recovery assembly includes a distillation tank, which is equipped with an electrolysis unit, and the distillation tank is connected to the acid storage tank through a recovery pipeline.

[0020] Furthermore, this application also proposes that a condenser pipe is connected to the upper end of the distillation tank, and a water storage tank is connected to the end of the condenser pipe. The water storage tank is connected to the acid discharge pipe through a flexible hose.

[0021] Due to the adoption of the above technical solution, the beneficial effects achieved by this utility model are as follows:

[0022] 1. A circulation pump is installed at the bottom of each chamber, forming a closed-loop circulation circuit through conduits. When the acid returns to the chamber through the output of the circulation pump, the flow direction forms convection with the suction at the input, promoting uniform mixing of the acid. A filter assembly is located on the suction side of the circulation pump; before entering the pump body, the acid passes through a ceramic honeycomb filter to remove metal particles, preventing impurities from damaging the impeller. A pH detection unit monitors the acidity / alkalinity of the acid in the circulation pipeline in real time. When the detected value falls below a set threshold, it triggers the acid mixing unit to move to the top of the corresponding chamber. After sliding along the track to the target position, the acid mixing unit replenishes the chamber with fresh acid through a telescopic acid discharge pipe, restoring the acid's activity.

[0023] This solution achieves dynamic acid replenishment through a sliding acid dispensing unit. Existing filtration devices are mostly located at the end of the circulation pipeline, leading to long-term impurity retention in the tank. This solution, however, uses pre-pump filtration to effectively protect the circulation system. Offline pH monitoring requires system shutdown for sampling; this solution combines online monitoring with mobile acid dispensing, significantly shortening response time. Furthermore, in existing technologies, waste acid treatment is separated from the main system; this solution achieves waste acid regeneration and recycling through integrated recovery components.

[0024] Through the above technical solution, this application achieves continuous circulation and dynamic acid mixing of acid solution within the pickling chamber, maintaining a balanced acid concentration in each chamber. The movable acid mixing unit accurately responds to pH changes in each chamber, reducing the frequency of downtime for acid replenishment. The pre-filter effectively intercepts impurities, reducing pump wear. This device solves the problems of rapid acid activity decay and delayed acid mixing in traditional pickling processes, improving pickling efficiency and quality stability.

[0025] 2. The pH detection unit continuously collects the pH value of the acid solution in the pickling tank and transmits the data to the control unit in real time. The control unit compares the received pH value with a preset threshold range. When the detected value exceeds the set range, a drive signal is generated to control the sliding mechanism of the acid mixing unit. For example, when the pH value in a certain pickling tank rises, the control unit drives the acid mixing unit to move above that pickling tank and replenishes new acid through the acid drain pipe. When the pH values ​​of multiple pickling tanks deviate from the standard simultaneously, the acid mixing units slide to the corresponding positions in a preset priority order to adjust the concentration. During this process, the moving speed and positioning accuracy of the sliding mechanism are dynamically adjusted by the control unit to ensure that the acid mixing operation is synchronized with the changes in the acid solution state.

[0026] This application enables the acid mixing unit to quickly respond to pH changes in different pickling chambers by linking the control unit with the sliding mechanism, eliminating the space limitations caused by the traditional fixed acid mixing structure and achieving dynamic and precise adjustment of multiple chambers.

[0027] Through the above technical solution, this application can automatically adjust the acid dispensing position according to the real-time pH value of each pickling tank, avoid operation delays caused by manual intervention, and solve the problem of uneven acid concentration in multiple tanks; by covering all pickling tanks with a sliding acid dispensing unit, the investment in repeated acid dispensing equipment is reduced, and the system complexity and maintenance costs are reduced; at the same time, it ensures that the acid activity is maintained within the optimal range, improving the uniformity and consistency of stainless steel surface treatment.

[0028] 3. After the acid solution enters the filter chamber through the inlet pipe, the diagonal distribution of the inlet and outlet pipes creates a spiral flow path within the filter chamber. Under the swirling action of the acid solution, the honeycomb channels of the ceramic honeycomb filter element capture metal particles through inertial collisions and trapping effects. After impurities in the acid solution are intercepted by the filter element, the clean acid solution returns to the circulation pump through the outlet pipe. The rigid structure of the ceramic honeycomb filter element can withstand acid erosion, preventing the filter element from collapsing or deforming, while the high porosity of the honeycomb channels reduces flow resistance.

[0029] This solution uses a ceramic honeycomb filter element combined with a diagonal inlet and outlet design. It utilizes swirling flow to extend the contact time between the acid and the filter element, thereby improving the impurity capture efficiency. At the same time, the honeycomb structure has a uniform distribution of pores, which can reduce the risk of local blockage.

[0030] Through the above technical solution, this application solves the problem of circulation pump wear caused by impurity deposition during pickling. It improves impurity separation efficiency through cyclone filtration, reduces filter element clogging frequency, and extends the continuous operating cycle of the filter assembly. The corrosion resistance of the ceramic honeycomb filter element reduces maintenance costs, while the diagonally distributed inlet and outlet pipe design avoids static deposition of impurities at the bottom of the filter box, ensuring the stability of acid circulation.

[0031] 4. Horizontal guide rails are laid along the length of the pickling tank, and the support frame forms a sliding pair with the guide rails via roller assemblies. The acid dispensing assembly is fixed to the top of the support frame and is connected to the acid storage tank via a hose. When an acid tank needs to be replenished, the support frame moves along the guide rails to above the target tank, and the acid dispensing assembly dispenses acid quantitatively according to a control signal. The hose adopts a corrosion-resistant corrugated pipe structure to maintain the continuity of the supply line during the movement of the support frame.

[0032] This design utilizes guide rails and sliding support frames to allow the acid dispensing unit to move freely along the axial direction of the pickling tank, covering all pickling compartments. The flexible hose connection avoids the limitations imposed by rigid pipelines on the movement range, enabling simultaneous acid supply and position adjustment.

[0033] Through the above technical solution, this application achieves rapid positioning and precise acid dispensing of the acid mixing unit among multiple acid washing chambers, solving the problem of acid dispensing lag caused by the fixed structure of traditional devices. The sliding operation mode of the support frame allows acid replenishment without interrupting the acid washing process, and the flexible connection of the hose ensures the reliability of continuous liquid supply, thereby improving the overall efficiency of the acid washing process.

[0034] 5. When the pH detection unit detects that the acid concentration in a pickling tank is lower than the set threshold, the control unit drives the slider of the vertical guide rail to lower the acid drain pipe below the surface of the pickling tank, and at the same time, the control valve opens to inject new acid. When the concentration returns to the target range, the acid drain pipe can automatically rise above the surface of the liquid to avoid overfilling. For example, after the support frame moves along the horizontal guide rail to the target pickling tank, the lifting and lowering of the vertical guide rail and the opening and closing of the acid drain pipe are linked through the control unit to ensure the accuracy and timeliness of acid replenishment.

[0035] This solution uses a vertical guide rail and a vertical sliding connection with the acid drain pipe to dynamically adjust the acid injection position according to the real-time liquid level, thus avoiding problems such as acid splashing or uneven mixing.

[0036] Through the above technical solution, this application achieves precise vertical positioning in the acid addition process, solves the problem of decreased acid mixing accuracy caused by liquid level changes in fixed acid mixing structures, and reduces the frequency of manual intervention and improves the automation level of multi-compartment continuous acid mixing through the linkage response of control valve and detection unit.

[0037] 6. The top plate of the protective cover is fixedly connected to the crossbeam of the support frame, and the side plates extend downward to form a semi-enclosed structure. The acid drain pipe extends downward through a pre-installed sealing sleeve at the bottom of the protective cover, with its end below the bottom edge of the protective cover but above the upper edge of the pickling tank opening. When the vertical guide rail drives the acid drain pipe downward, the movable door on the side plate of the protective cover can be flipped outward, allowing the acid drain pipe to move freely below the liquid surface in the pickling tank. The guide channel inside the protective cover can collect any accidentally seeping acid and discharge it through the bottom drain port.

[0038] This solution creates a physical isolation space through a protective shield, significantly reducing the corrosive effect of acid mist on precision components, while also preventing acid splashes from contaminating surrounding equipment.

[0039] Through the above technical solution, this application effectively prevents the volatile acid mist during pickling from corroding the moving parts on the support frame, extends the service life of the vertical guide rails and control valves, and reduces the frequency of downtime maintenance due to component corrosion. The sealing structure of the protective cover also prevents accidental splashing of acid to the outside of the equipment, improving the safety of the operating environment.

[0040] 7. In the pickling process, when acid needs to be replenished, the acid drain pipe slides to the second position via the vertical guide rail. The acid is then injected directly into the liquid below the surface through the control valve, preventing acid mist from escaping and improving mixing efficiency. When acid preparation is complete or acid addition needs to be paused, the acid drain pipe can slide to the first position, detaching from the liquid surface to prevent backflow of impurities or pipeline corrosion. For example, when the liquid level in the pickling tank fluctuates, the height of the acid drain pipe can be dynamically adjusted to always maintain the injection point at a predetermined depth below the liquid surface, ensuring a stable acid preparation process.

[0041] This solution utilizes a sliding structure with vertical guide rails to enable flexible switching of the acid drain pipe position, reducing acid evaporation losses and avoiding the risk of pipe blockage.

[0042] Through the above technical solution, this application can dynamically adjust the acid injection position according to the actual working conditions of the pickling tank, reduce acid mist generation and improve mixing uniformity, while reducing pipeline maintenance frequency, thereby improving the continuity and stability of the pickling process.

[0043] 8. When the activity of the acid in the pickling tank decreases to a threshold, the three-way valve switches the channel to direct a portion of the waste acid into the waste acid recovery unit for treatment, while simultaneously maintaining the remaining acid in the pickling tank for continued circulation. The waste acid recovery unit distills, purifies, and electrolyzes the introduced waste acid to remove metal impurities and separates the regenerated acid. During this process, the pickling tank does not need to be completely emptied to achieve dynamic waste acid recovery; the acid output from the circulation pump is controlled by diversion based on the status of the three-way valve.

[0044] This solution integrates a three-way valve with the output of a circulating pump to achieve online diversion and regeneration of waste acid. The operation of the pickling tank and the recovery of waste acid can be carried out simultaneously, avoiding production stoppages caused by acid replacement in traditional processes.

[0045] Through the above technical solution, this application achieves continuous recovery and reuse of waste acid during the pickling process, reducing the frequency of downtime for acid replacement and improving the utilization rate of acid resources. Online treatment of the spent acid reduces the accumulation rate of heavy metal impurities in the pickling tank, alleviating the load on the subsequent filtration system and reducing the discharge of highly polluting waste acid.

[0046] 9. This solution combines a distillation tank and an electrolysis unit, superimposed with electrochemical treatment after high-temperature evaporation, to simultaneously remove soluble metal ions and non-volatile impurities. Compared to single distillation or electrolysis processes, this integrated solution improves the purity of regenerated acid to a reusable standard and avoids secondary pollution caused by the addition of chemical agents.

[0047] Through the above technical solution, this application can achieve efficient removal of metal impurities and effective recovery of acid components from waste acid. Electrolytic treatment can deeply decompose complexed metal ions that are difficult to treat by traditional precipitation methods, while the distillation process separates acid and water to maintain acid concentration stability. This significantly reduces the amount of new acid replenishment, while also reducing the discharge of waste liquid containing heavy metals, thus improving the environmental friendliness and resource utilization rate of the pickling process.

[0048] 10. After electrolysis in the distillation tank, the resulting acidic vapor is cooled and liquefied through a condenser, and the liquid water is temporarily stored in a storage tank. When the acid concentration in the pickling chamber is too high, the condensate in the storage tank is transported to the acid drain pipe through a hose and precisely injected into the corresponding pickling chamber as the acid mixing unit moves. The condensate can be used as a diluent to adjust the acid concentration or to clean residual impurities in the filter components, avoiding additional consumption of external water sources. Furthermore, the direct connection between the storage tank and the acid drain pipe eliminates the need for independent storage and transportation of condensate in traditional processes, reducing the risk of cross-contamination in the pipelines.

[0049] This solution reduces wastewater discharge by directly connecting the recovered condensate to the acid distribution system, and also allows the condensate to be reused as process water, thus reducing the consumption of fresh water resources. Furthermore, the flexible connection design between the storage tank and the acid discharge pipe avoids spatial interference issues caused by fixed pipelines, ensuring a stable water supply even when the acid distribution unit is in motion.

[0050] Through the above technical solution, this application effectively solves the problems of water waste and secondary pollution of condensate in waste acid treatment, and realizes the closed-loop recycling of water resources in the pickling process. The trace acidic substances remaining in the condensate can be used as a diluent to participate in the adjustment of acid concentration, reducing the amount of new acid replenishment, while avoiding the potential environmental hazards caused by condensate discharge in traditional processes. Attached Figure Description

[0051] Figure 1 is a structural schematic diagram of a specific embodiment of the present utility model;

[0052] Figure 2 is a top view of a specific embodiment of this utility model;

[0053] Figure 3 is a side view of this utility model.

[0054] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0055] In the attached diagram:

[0056] 1. Pickling tank; 101. Pickling chamber; 2. Circulation pump; 21. Conduit; 3. pH detection unit; 4. Filter assembly; 5. Horizontal guide rail; 6. Support frame; 61. Protective cover; 7. Vertical guide rail; 8. Acid drain pipe; 9. Distillation tank; 10. Acid storage tank; 11. Water storage tank; 12. Condensation piping. Detailed Implementation

[0057] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0058] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0059] Furthermore, it should be understood in the description of this utility model that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0060] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0061] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," or "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0062] This application proposes a continuous circulating acid preparation device including an acid pickling tank 1. Referring to Figures 1-3, the acid pickling tank 1 is provided with several acid pickling chambers 101 at intervals. Each acid pickling chamber 101 is provided with a circulating pump 2 at its bottom. The input end and output end of the circulating pump 2 are connected to the acid pickling chamber 101 through a conduit 21. A filter assembly 4 is provided on the conduit 21 at the input end of the circulating pump 2. A pH detection unit 3 is provided on the input end or output end of the circulating pump 2. The device also includes an acid preparation unit located above the acid pickling tank 1 and slidably connected along the arrangement direction of the acid pickling chambers 101.

[0063] The pickling chamber 101 is an independent chamber for containing pickling solution. It can be made of acid-resistant material and arranged horizontally in a compartmentalized structure, with a preset distance between adjacent chambers to form a circulation channel. The circulation pump 2 is a power unit for driving the acid solution to circulate within the chamber. It can be a corrosion-resistant centrifugal pump for acid intake and discharge. The filter assembly 4 is a device for intercepting solid particles in the acid solution. It can be a filter box structure containing a ceramic honeycomb filter element, with the inlet and outlet pipes arranged diagonally to extend the filtration path. The pH detection unit 3 is a sensor for real-time monitoring of the acidity and alkalinity of the acid solution. It can be an electrode-type detection probe integrated into the circulation pipeline. The acid mixing unit is a mobile filling device for replenishing new acid. It can be a support frame 6 with sliding guide rails supporting the acid mixing container, connected to the acid storage tank 10 via a hose.

[0064] Specifically, pickling chambers 101 are evenly distributed along the length of the tank, with circulation pumps 2 installed at the bottom of each chamber, forming a closed-loop circulation circuit through conduits 21. When the acid returns to the chamber through the output of the circulation pump 2, the flow direction forms convection with the suction at the input, promoting uniform mixing of the acid. The filter assembly 4 is located on the suction side of the circulation pump 2, and the acid passes through a ceramic honeycomb filter to remove metal particles before entering the pump, preventing impurities from damaging the impeller. The pH detection unit 3 monitors the acidity and alkalinity of the acid in the circulation pipeline in real time. When the detected value is lower than the set threshold, it triggers the acid mixing unit to move to the top of the corresponding chamber. After the acid mixing unit slides along the track to the target position, it replenishes the chamber with new acid through the telescopic acid discharge pipe 8 to restore the acid activity.

[0065] Compared to existing technologies, traditional devices with fixed acid distribution structures cannot meet the diverse needs of multi-compartment systems. This solution, however, achieves dynamic acid replenishment through a sliding acid distribution unit. Existing filtration devices are mostly located at the end of the circulation pipeline, leading to long-term impurity retention in the tank. This solution, with pre-pump filtration, effectively protects the circulation system. Offline pH monitoring requires system shutdown for sampling; this solution combines online monitoring with mobile acid distribution, significantly shortening response time. Furthermore, in existing technologies, waste acid treatment is separated from the main system; this solution achieves waste acid regeneration and recycling through integrated recovery components.

[0066] Through the above technical solution, this application achieves continuous circulation and dynamic acid mixing of acid solution within pickling chamber 101, maintaining a balanced acid concentration in each chamber. The movable acid mixing unit accurately responds to pH changes in each chamber, reducing the frequency of downtime for acid replenishment. Pre-filtration effectively intercepts impurities, reducing pump wear. This device solves the problems of rapid acid activity decay and delayed acid mixing in traditional pickling processes, improving pickling efficiency and quality stability.

[0067] Referring to Figures 1-3, this application further proposes a control unit that controls the sliding of the acid mixing unit based on the detection value of the pH detection unit 3.

[0068] The control unit refers to the automated equipment used to receive sensor signals and perform logical operations. Specifically, it can be implemented using a programmable logic controller (PLC) or an industrial computer, and can generate control commands according to a preset program. The pH detection unit 3 is a sensor device used to measure the acidity and alkalinity of the acid solution in real time. Specifically, it can be implemented using a glass electrode pH meter or a solid-state ion-sensitive field-effect transistor, and can feed the detection data back to the control unit. The acid mixing unit sliding mechanism refers to changing the horizontal position of the acid mixing assembly above the pickling tank 1 through a drive mechanism. Specifically, it can be achieved using a servo motor in conjunction with a ball screw or an electric slide rail structure, allowing the acid mixing assembly to move along the arrangement direction of the pickling chamber 101.

[0069] Specifically, the pH detection unit 3 continuously collects the pH value of the acid solution in the pickling tank 101 and transmits the data to the control unit in real time. The control unit compares the received pH value with a preset threshold range. When the detected value exceeds the set range, it generates a drive signal to control the sliding mechanism of the acid mixing unit. For example, when the pH value in a certain pickling tank 101 rises, the control unit drives the acid mixing unit to move above that pickling tank 101 and replenishes new acid through the acid drain pipe 8. When the pH values ​​of multiple pickling tanks 101 deviate from the standard at the same time, the acid mixing unit slides to the corresponding position in a preset priority order to adjust the concentration. During this process, the moving speed and positioning accuracy of the sliding mechanism are dynamically adjusted by the control unit to ensure that the acid mixing operation is synchronized with the changes in the acid solution state.

[0070] Compared with existing technologies, the pH detection unit 3 in existing pickling devices is mostly fixed in a single location or relies on manual offline detection, which cannot reflect the differences in acid state of each pickling chamber 101 in real time, resulting in a lag in acid preparation adjustment. In contrast, this application enables the acid preparation unit to quickly respond to pH changes in different pickling chambers 101 through the linkage of the control unit and the sliding mechanism, eliminating the space limitations caused by the traditional fixed acid preparation structure and realizing dynamic and precise adjustment of multiple chambers.

[0071] Through the above technical solution, this application can automatically adjust the acid dispensing position according to the real-time pH value of each pickling tank 101, avoid operation delays caused by manual intervention, and solve the problem of uneven acid concentration in multiple tanks; by covering all pickling tanks 101 with a sliding acid dispensing unit, the investment in repeated acid dispensing equipment is reduced, and the system complexity and maintenance costs are reduced; at the same time, it ensures that the acid activity is maintained within the optimal range, and improves the uniformity and consistency of stainless steel surface treatment.

[0072] Referring to Figure 3, this application further proposes a filter assembly 4 including a filter box, a filter element provided inside the filter box, the filter element being a ceramic honeycomb filter element, an inlet pipe and a drain pipe provided on the filter box, the inlet pipe and the drain pipe being diagonally arranged on the outer walls of opposite sides of the filter box, and the inlet pipe and the drain pipe being connected to adjacent conduit 21 connectors respectively.

[0073] The filter box is a sealed container for holding the filter element, typically made of acid-resistant polypropylene. It is connected to conduit 21 via a flange, and its internal cavity guides the acid solution through the filter element. The ceramic honeycomb filter element is a filter medium with a porous structure, typically made of alumina-based ceramic through-holes. Its honeycomb structure can trap suspended metal particles and reaction products in the acid solution. The diagonal arrangement of the inlet and outlet pipes means that their axes are asymmetrically distributed on the side wall of the filter box. Specifically, the center line of the pipe openings can form an angle of 30° to 60° with the bottom surface of the filter box, creating a swirling flow of the acid solution within the filter box.

[0074] Specifically, after the acid enters the filter box through the inlet pipe, the diagonal distribution of the inlet and outlet pipes creates a spiral flow path within the filter box. Under the swirling action of the acid, the honeycomb channels of the ceramic honeycomb filter element capture metal particles through inertial collisions and trapping effects. After impurities in the acid are intercepted by the filter element, the clean acid returns to the circulation pump 2 via the outlet pipe. The rigid structure of the ceramic honeycomb filter element can withstand acid erosion, preventing the filter element from collapsing or deforming, while the high porosity of the honeycomb channels reduces flow resistance.

[0075] Compared to existing technologies, most existing filtration devices use planar filters or single-layer filtration structures. When acid flows straight through the filter, it is prone to local blockage due to impurity accumulation, and filter replacement requires shutdown and disassembly. This solution uses a ceramic honeycomb filter element combined with a diagonal inlet and outlet design. It utilizes swirling flow to extend the contact time between the acid and the filter element, improving impurity capture efficiency. At the same time, the uniform distribution of pores in the honeycomb structure reduces the risk of local blockage.

[0076] Through the above technical solution, this application solves the problem of wear on the circulating pump 2 caused by impurity deposition during pickling. It improves impurity separation efficiency through cyclone filtration, reduces the frequency of filter element clogging, and extends the continuous operating cycle of the filter assembly 4. The corrosion resistance of the ceramic honeycomb filter element reduces maintenance costs, while the diagonally distributed inlet and outlet pipe design avoids static deposition of impurities at the bottom of the filter box, ensuring the stability of acid circulation.

[0077] Referring to Figures 1-3, this application further proposes an acid mixing unit including a horizontal guide rail 5 arranged along the length of the pickling tank 1, a support frame 6 slidably connected on the horizontal guide rail 5, an acid mixing component on the support frame 6, and a hose connecting the acid mixing component and the acid storage tank 10.

[0078] The horizontal guide rail 5 refers to the guide structure extending longitudinally along the pickling tank 1, which can be implemented using I-beams or aluminum alloy profiles, and is used to support the movement of the acid mixing unit. The support frame 6 refers to the movable frame that carries the acid mixing assembly, which can be implemented using a steel structure with rollers to allow it to slide smoothly along the guide rail. The acid mixing assembly refers to the device used to mix and distribute the acid solution, which can be implemented using a combination structure of a metering pump and a mixing chamber, and is flexibly connected to the acid storage tank 10 via a hose.

[0079] Specifically, the horizontal guide rail 5 is laid along the length of the pickling tank 1, and the support frame 6 forms a sliding pair with the guide rail through a roller assembly. The acid dispensing assembly is fixed to the top of the support frame 6 and is connected to the acid storage tank 10 through a hose. When a pickling compartment 101 needs to be replenished with acid, the support frame 6 moves along the guide rail to above the target compartment, and the acid dispensing assembly dispenses acid quantitatively according to the control signal. The hose adopts a corrosion-resistant corrugated pipe structure to maintain the continuity of the liquid supply line during the movement of the support frame 6.

[0080] Compared to existing technologies, traditional acid mixing units mostly employ fixed pipeline layouts, which cannot adapt to the dynamic acid mixing needs of multiple compartments. This solution, through the cooperation of guide rails and sliding support frames 6, allows the acid mixing unit to move freely along the axis of the pickling tank 1, covering all pickling compartments 101. The flexible hose connection method avoids the limitation of rigid pipelines on the range of movement, enabling simultaneous acid supply and position adjustment.

[0081] Through the above technical solution, this application achieves rapid positioning and precise acid dispensing of the acid dispensing unit among the multiple acid washing chambers 101, solving the problem of acid dispensing lag caused by the fixed structure of traditional devices. The sliding operation mode of the support frame 6 allows acid replenishment without interrupting the acid washing process, and the flexible connection of the hose ensures the reliability of continuous liquid supply, thereby improving the overall efficiency of the acid washing process.

[0082] Referring to Figures 1 and 3, this application further proposes an acid mixing unit including a vertical guide rail 7 disposed in the middle of the support frame 6, an acid discharge pipe 8 slidably connected to the vertical guide rail 7, and a control valve disposed on the acid discharge pipe 8, the control valve being electrically connected to the control unit.

[0083] The vertical guide rail 7 refers to a guide structure extending vertically, which can be implemented using a combination of a T-slot rail and a slider. It supports the acid drain pipe 8 and guides its vertical movement, thereby adjusting the relative position of the acid drain pipe 8 and the liquid surface of the pickling tank 101. The acid drain pipe 8 is a tubular component used to transport acid, which can be made of corrosion-resistant polytetrafluoroethylene (PTFE). Its diameter can range from 20-50 mm, and its end can be equipped with a multi-hole nozzle to achieve uniform acid distribution. The control valve is the actuator that regulates the acid flow rate, which can be implemented using an electromagnetic regulating valve or a pneumatic butterfly valve. It receives instructions from the control unit via electrical signals to adjust the acid supply rate in real time.

[0084] Specifically, the vertical guide rail 7 in the middle of the support frame 6 and the slidably connected acid drain pipe 8 constitute a vertical position adjustment mechanism. When the pH detection unit 3 detects that the acid concentration in a certain pickling chamber 101 is lower than the set threshold, the control unit drives the slider of the vertical guide rail 7 to lower the acid drain pipe 8 below the liquid surface of the pickling chamber 101, and at the same time, the control valve opens to inject new acid. When the concentration returns to the target range, the acid drain pipe 8 can automatically rise above the liquid surface to avoid over-addition. For example, after the support frame 6 moves along the horizontal guide rail 5 to the target pickling chamber 101, the lifting and lowering action of the vertical guide rail 7 and the opening and closing operation of the acid drain pipe 8 are linked through the control unit to ensure the accuracy and timeliness of acid replenishment.

[0085] Compared with existing technologies, traditional acid mixing devices mostly use acid discharge pipes 8 at a fixed height. During the acid addition process, the acid dosage is prone to deviation due to liquid level fluctuations, and they cannot adapt to the depth differences of different pickling tanks 101. This solution, through the vertical sliding cooperation between the vertical guide rail 7 and the acid discharge pipe 8, can dynamically adjust the acid injection position according to the real-time liquid level, avoiding problems such as acid splashing or uneven mixing.

[0086] Through the above technical solution, this application achieves precise vertical positioning in the acid addition process, solves the problem of decreased acid mixing accuracy caused by liquid level changes in fixed acid mixing structures, and reduces the frequency of manual intervention and improves the automation level of multi-compartment continuous acid mixing through the linkage response of control valve and detection unit.

[0087] Referring to Figures 1 and 2, this application further proposes that the support frame 6 is provided with a protective cover 61, and the acid drain pipe 8 is located below the protective cover 61.

[0088] The protective cover 61 refers to the outer shell structure covering the upper part of the support frame 6. It can be made of corrosion-resistant polypropylene sheet and fixed with bolts to form a closed space. This structure prevents acid mist from directly contacting the vertical guide rails 7 and control valves on the support frame 6, avoiding acid crystallization that could cause mechanical parts to jam. The acid drain pipe 8 being located below the protective cover 61 means that the end of the acid drain pipe 8 extends beyond the area covered by the protective cover 61, specifically 20-40 cm below the bottom edge of the protective cover 61. This arrangement prevents acid dripping and corrosion of the internal components of the protective cover 61 while ensuring accurate injection of acid into the pickling tank 101 below the liquid surface.

[0089] Specifically, the top plate of the protective cover 61 is fixedly connected to the crossbeam of the support frame 6, and the side plates extend downward to form a semi-enclosed structure. The acid drain pipe 8 extends downward through a pre-set sealing sleeve at the bottom of the protective cover 61, with its end below the bottom edge of the protective cover 61 but above the upper edge of the opening of the pickling tank 101. When the vertical guide rail 7 drives the acid drain pipe 8 to descend, the movable door opened on the side plate of the protective cover 61 can be flipped outward, allowing the acid drain pipe 8 to move freely to below the liquid surface of the pickling tank 101. The guide channel provided inside the protective cover 61 can collect any acid that accidentally seeps in and discharge it through the bottom drain port.

[0090] Compared to existing technologies, the moving parts of traditional acid mixing devices are directly exposed to the acid mist environment. Acid crystallization can easily cause guide rail jamming, and corrosion of control valves can lead to a decrease in adjustment accuracy. This solution uses a protective cover 61 to create a physical isolation space, significantly reducing the corrosive effect of acid mist on precision components, while also preventing acid splashes from contaminating surrounding equipment.

[0091] Through the above technical solution, this application effectively prevents the volatile acid mist during pickling from corroding the moving parts on the support frame 6, extends the service life of the vertical guide rail 7 and the control valve, and reduces the frequency of downtime maintenance due to component corrosion. The sealing structure of the protective cover 61 also prevents acid from accidentally splashing to the outside of the equipment, improving the safety of the operating environment.

[0092] Referring to Figure 1, this application further proposes that the acid drain pipe 8 slides with the vertical guide rail 7 to have a first position located above the pickling tank 101 and a second position located below the liquid surface inside the pickling tank 101.

[0093] The acid drain pipe 8 is a pipe used to deliver acid into the pickling tank 101. It is slidably connected to the vertical guide rail 7, allowing for height adjustment. This can be achieved through motor drive or a manual slider mechanism, thus adapting to the different acid addition positions required at different pickling stages. The first position refers to the outlet of the acid drain pipe 8 being above the liquid surface in the pickling tank 101. This can be achieved by raising the acid drain pipe 8 above the liquid surface, preventing acid residue or blockage, and is suitable for temporary cessation of acid addition or maintenance operations. The second position refers to the outlet of the acid drain pipe 8 being submerged below the liquid surface in the pickling tank 101. This can be achieved by lowering the acid drain pipe 8 so that its end extends at least 10 cm below the liquid surface, thereby reducing acid splashing and evaporation while ensuring thorough mixing of the acid with the solution in the tank.

[0094] Specifically, in the pickling process, when acid needs to be replenished, the acid drain pipe 8 slides to the second position via the vertical guide rail 7, and the acid is injected directly below the liquid surface through the control valve from the acid drain pipe 8, preventing acid mist from escaping and improving mixing efficiency. When acid preparation is complete or acid addition needs to be paused, the acid drain pipe 8 can slide to the first position, detaching from the liquid surface to avoid backflow of impurities or pipeline corrosion. For example, when the liquid level in the pickling tank 101 fluctuates, the height of the acid drain pipe 8 can be dynamically adjusted to always maintain the injection point at a predetermined depth below the liquid surface, ensuring a stable acid preparation process.

[0095] Compared with existing technologies, the outlet position of the traditional fixed acid drain pipe 8 cannot be adjusted according to changes in the liquid level, which easily leads to bubbles or splashing during acid injection, and residual acid may backflow and block the pipeline when the machine is shut down. This solution achieves flexible switching of the position of the acid drain pipe 8 through the sliding structure of the vertical guide rail 7, which reduces acid evaporation loss and avoids the risk of pipeline blockage.

[0096] Through the above technical solution, this application can dynamically adjust the acid injection position according to the actual working conditions of the pickling tank 101, reduce the generation of acid mist and improve the mixing uniformity, while reducing the frequency of pipeline maintenance, thereby improving the continuity and stability of the pickling process.

[0097] Referring to Figures 1 and 2, this application further proposes that it also includes a waste acid recovery component, and the output end of the circulation pump 2 is connected to the waste acid recovery component and the conduit 21 respectively through a three-way valve.

[0098] The waste acid recovery unit refers to a device used to collect and treat the spent acid generated during the pickling process. Specifically, it can be implemented using a structure including a distillation tank 9 and an electrolysis unit. The distillation tank 9 separates recyclable components from the waste acid through heating, while the electrolysis unit electrolytically precipitates residual metal ions. The three-way valve refers to a switching valve with three fluid channels, specifically a solenoid-controlled three-way ball valve. The valve opening degree controls the circulation path of the acid to the waste acid recovery unit or back to the pickling chamber 101.

[0099] Specifically, when the activity of the acid in the pickling tank 101 decreases to a threshold, the three-way valve switches the channel to introduce a portion of the waste acid into the waste acid recovery component for treatment, while simultaneously maintaining the remaining acid in the pickling tank 101 for continued circulation. The waste acid recovery component performs distillation purification and electrolysis on the introduced waste acid to remove metal impurities and separate the regenerated acid. During this process, the pickling tank 101 does not need to be completely emptied to achieve dynamic recovery of waste acid, and the acid output from the circulation pump 2 is diverted according to the status of the three-way valve.

[0100] Compared with existing technologies, traditional waste acid treatment requires shutting down and emptying the pickling tank 101 before centralized processing, resulting in production interruptions and low processing efficiency. This solution achieves online diversion and regeneration of waste acid through the integrated design of a three-way valve and the output end of the circulating pump 2. The operation of the pickling tank 101 and the recovery of waste acid can be carried out simultaneously, avoiding production stoppages caused by acid replacement in traditional processes.

[0101] Through the above technical solution, this application achieves continuous recovery and reuse of waste acid during the pickling process, reducing the frequency of downtime for acid replacement and improving the utilization rate of acid resources. Online treatment of the spent acid reduces the accumulation rate of heavy metal impurities in the pickling tank 101, alleviating the load on the subsequent filtration system and reducing the discharge of highly polluting waste acid.

[0102] Referring to Figure 2, this application further proposes a waste acid recovery assembly including a distillation tank 9, which is equipped with an electrolysis unit. The distillation tank 9 is connected to the acid storage tank 10 via a recovery pipeline.

[0103] The distillation tank 9 refers to a sealed container used for treating waste acid, which can be made of corrosion-resistant stainless steel into a cylindrical tank. It can have a feed port with a sealed cap at the top and a heating jacket at the bottom. The electrolysis unit refers to the built-in electrode assembly structure, which can be implemented using a combination of a titanium-based anode coated with precious metal oxides and a stainless steel cathode. When energized, it can perform oxidation-reduction reactions on the metal ions in the waste acid.

[0104] The recovery pipeline refers to the conveying channel connecting the distillation tank 9 and the acid storage tank 10. Specifically, it can be implemented using a double-layer insulated pipe made of polytetrafluoroethylene (PTFE), and an anti-crystallization heat tracing device can be installed on the pipeline. This pipeline can transport the regenerated acid solution after distillation and purification to the acid storage tank 10 for recycling.

[0105] Specifically, after the waste acid solution is switched into the distillation tank 9 via a three-way valve, it is first separated from water by heating and evaporation. Then, the electrolysis unit electrolyzes the metal impurities in the concentrate. During electrolysis, the anode oxidizes metal ions to form precipitates, while the cathode reduces residual acid radicals. The purified acid solution is returned to the acid storage tank 10 via a recovery pipeline, forming a closed loop. For example, the distillation tank 9 can be equipped with multi-stage baffles to extend the residence time of the waste acid, and the electrolysis unit can be configured with a pulse power supply to improve reaction efficiency.

[0106] In some specific embodiments, the heating temperature of the distillation tank 9 can be controlled within the range of 80-120℃, and the operating voltage of the electrolysis unit can be set to 12-36V DC. The recovery pipeline can be designed with a slope of 5-10 degrees to avoid liquid stagnation. The anode surface of the electrolysis unit can be coated with an iridium-tantalum composite oxide coating, and the cathode can be designed with a mesh structure to increase the reaction area.

[0107] Compared to existing technologies, traditional waste acid treatment methods often employ static precipitation or simple neutralization, which cannot effectively separate metallic impurities from acidic components. This invention, however, combines a distillation tank 9 with an electrolysis unit, superimposing electrochemical treatment after high-temperature evaporation to simultaneously remove soluble metal ions and non-volatile impurities. Compared to single distillation or electrolysis processes, this integrated solution improves the purity of regenerated acid to a reusable standard and avoids secondary pollution caused by the addition of chemical agents.

[0108] Through the above technical solution, this application can achieve efficient removal of metal impurities and effective recovery of acid components from waste acid. Electrolytic treatment can deeply decompose complexed metal ions that are difficult to treat by traditional precipitation methods, while the distillation process separates acid and water to maintain acid concentration stability. This significantly reduces the amount of new acid replenishment, while also reducing the discharge of waste liquid containing heavy metals, thus improving the environmental friendliness and resource utilization rate of the pickling process.

[0109] Referring to Figure 2, this application further proposes that the upper end of the distillation tank 9 is connected to a condenser pipe 12, and the end of the condenser pipe 12 is connected to a water storage tank 11, which is connected to the acid discharge pipe 8 through a hose.

[0110] The condenser pipe 12 is a channel for cooling the steam generated during the waste acid treatment process in the distillation tank 9. It can be implemented using a spiral coil or shell-and-tube heat exchanger structure, and its function is to convert the high-temperature steam into liquid water. The water storage tank 11 is a container for collecting condensate, and can be made of corrosion-resistant materials such as polypropylene or fiberglass. Its function is to provide dilution water or cleaning water for the pickling process. The connection between the flexible hose and the acid drain pipe 8 refers to the use of a flexible pipe to connect the water storage tank 11 to the acid drain pipe 8 of the acid distribution unit. It can be made of fluororubber or polytetrafluoroethylene, and its function is to achieve directional transportation and recycling of condensate.

[0111] Specifically, after the waste acid is electrolyzed in the distillation tank 9, the resulting acidic vapor is cooled and liquefied through the condenser pipe 12, and the liquid water is temporarily stored in the water storage tank 11. When the acid concentration in the pickling chamber 101 is too high, the condensate in the water storage tank 11 is transported to the acid discharge pipe 8 through a hose and precisely injected into the corresponding pickling chamber 101 as the acid mixing unit moves. The condensate can be used as a diluent to adjust the acid concentration or to clean residual impurities in the filter assembly 4, avoiding additional consumption of external water sources. In addition, the direct connection between the water storage tank 11 and the acid discharge pipe 8 eliminates the need for independent storage and transportation of condensate in traditional processes, reducing the risk of cross-contamination of pipelines.

[0112] Compared to existing technologies, condensate from traditional waste acid treatment processes is typically discharged directly as wastewater, failing to achieve resource utilization. This solution, by recovering the condensate and directly connecting it to the acid mixing system, not only reduces wastewater discharge but also allows the condensate to be reused as process water, reducing the consumption of fresh water resources. Simultaneously, the flexible connection design between the water storage tank 11 and the acid discharge pipe 8 avoids spatial interference problems caused by fixed pipelines, ensuring a stable water supply to the acid mixing unit even during relocation.

[0113] Through the above technical solution, this application effectively solves the problems of water waste and secondary pollution of condensate in waste acid treatment, and realizes the closed-loop recycling of water resources in the pickling process. The trace acidic substances remaining in the condensate can be used as a diluent to participate in the adjustment of acid concentration, reducing the amount of new acid replenishment, while avoiding the potential environmental hazards caused by condensate discharge in traditional processes.

[0114] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0115] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0116] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A continuous circulating acid preparation device for stainless steel pickling processes, characterized in that, The system includes an acid pickling tank, which contains several acid pickling chambers spaced apart. Each acid pickling chamber has a circulation pump at its bottom. The input and output ends of the circulation pump are connected to the acid pickling chambers via conduits. A filter assembly is provided on the conduit at the input end of the circulation pump. A pH detection unit is provided on the input or output end of the circulation pump. The system also includes an acid mixing unit, which is located above the acid pickling tank and is slidably arranged along the arrangement direction of the acid pickling chambers.

2. The continuous circulating acid preparation device for stainless steel pickling process according to claim 1, characterized in that, It also includes a control unit, which controls the sliding of the acid mixing unit based on the detection value of the pH detection unit.

3. A continuous circulating acid preparation device for stainless steel pickling process according to claim 1, characterized in that, The filtration assembly includes a filter box containing a filter element, which is a ceramic honeycomb filter element. The filter box is equipped with an inlet pipe and an outlet pipe, which are diagonally arranged on the outer walls of opposite sides of the filter box. The inlet pipe and the outlet pipe are respectively connected to adjacent conduit connectors.

4. A continuous circulating acid preparation device for stainless steel pickling process according to claim 2, characterized in that, The acid mixing unit includes a horizontal guide rail arranged along the length of the pickling tank, a support frame slidably connected to the horizontal guide rail, an acid mixing component on the support frame, and a hose connecting the acid mixing component to the acid storage tank.

5. A continuous circulating acid preparation device for stainless steel pickling process according to claim 4, characterized in that, The acid mixing unit includes a vertical guide rail located in the middle of the support frame, an acid discharge pipe slidably connected to the vertical guide rail, and a control valve provided on the acid discharge pipe, the control valve being electrically connected to the control unit.

6. A continuous circulating acid preparation device for stainless steel pickling process according to claim 5, characterized in that, The support frame is equipped with a protective cover, and the acid drain pipe is located below the protective cover.

7. A continuous circulating acid preparation device for stainless steel pickling process according to claim 5, characterized in that, The acid drain pipe slides along the vertical guide rail to have a first position located above the pickling tank and a second position located below the liquid surface inside the pickling tank.

8. A continuous circulating acid preparation device for stainless steel pickling process according to any one of claims 1-7, characterized in that, It also includes a waste acid recovery component, and the output end of the circulation pump is connected to the waste acid recovery component and the conduit via a three-way valve.

9. A continuous circulating acid preparation device for stainless steel pickling process according to claim 8, characterized in that, The waste acid recovery assembly includes a distillation tank, which is equipped with an electrolysis unit. The distillation tank is connected to the acid storage tank via a recovery pipeline.

10. A continuous circulating acid preparation device for stainless steel pickling process according to claim 9, characterized in that, The upper end of the distillation tank is connected to a condenser pipe, and the end of the condenser pipe is connected to a water storage tank. The water storage tank is connected to the acid drain pipe through a hose.

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