A method for preparing an aluminum stripping solution

Abstract

This invention discloses a method for preparing an aluminum stripping solution, belonging to the field of aluminum stripping solution preparation technology, including the following steps: S1 Raw material preparation; S2 Feeding and mixing: deionized water, sodium hydroxide and nitric acid are sequentially added to the preparation equipment and stirred until completely dissolved to obtain a basic mixture; S3 Corrosion inhibitor addition; S4 Homogenization adjustment; S5 Finished product discharge; The aluminum stripping solution preparation equipment provided by this method automatically adjusts the distance between the material plate and the material box through a synchronous mechanism, which can not only ensure the precise docking of the mixer and the material box and improve the mixing uniformity, but also achieve rapid separation and cleaning, significantly reducing maintenance costs and safety risks.

Description

Technical Field

[0001] This invention relates to a method for preparing an aluminum stripping solution, belonging to the technical field of aluminum stripping solution preparation. Background Technology

[0002] In the surface treatment and processing of aluminum and aluminum alloys, aluminum stripping solution is the core chemical agent for achieving precise peeling of oxide films and protective coatings. The uniformity and stability of its components directly determine the surface quality of aluminum products, the precision of subsequent processing, and the yield of finished products. To meet the stringent requirements of downstream industries such as electronics, packaging, and construction for the surface cleanliness of aluminum products, developing efficient and stable aluminum stripping solution preparation processes and equipment has become a key aspect of technological upgrading in the industry.

[0003] Currently, most mainstream aluminum stripping solution preparation equipment in the industry adopts a structure with a fixed support, a single stirring shaft, and an independent material tank. The preparation process typically involves manually adding raw materials such as sodium hydroxide, nitric acid, and corrosion inhibitors sequentially into the fixed material tank, then starting the top-mounted stirring motor to drive the single-shaft stirring paddle for mixing. After mixing, the material tank needs to be manually moved to discharge the material, and the exposed stirring shaft needs to be manually cleaned. While some improved equipment uses a single screw to adjust the height of the stirring shaft, this only changes the mixing depth; the relative position of the material plate and the material tank still requires manual adjustment.

[0004] The above solution has the following shortcomings in practical use: 1. Currently, the single-shaft stirring structure can only act on materials in the middle of the tank. Unmixed raw materials are easily left on the bottom and side walls of the container, resulting in uneven composition of the aluminum stripping solution and affecting the final performance. Secondly, the stirring component and the tank are fixedly connected, making it difficult to separate quickly. Residual materials are prone to solidification and clumping, which not only increases the difficulty and cost of cleaning and maintenance, but also easily causes cross-contamination between batches. At the same time, the operation process of manually moving the tank and disassembling the stirring component is cumbersome and has low production efficiency. Moreover, when the stirring shaft is exposed, there is a safety risk of accidental injury and chemical corrosion. 2. The multi-motor drive mode of the multi-shaft mixing scheme not only increases the purchase and maintenance costs of the equipment, but also causes material flow field disorder due to the speed difference of multiple motors, which further affects the mixing uniformity. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a method for preparing aluminum stripping solution, aiming to solve the problems of uneven mixing due to single-axis stirring, difficulty in cleaning and maintenance of fixed docking, high cost and energy consumption, and turbulent flow field caused by speed difference in current preparation equipment.

[0006] The technical solution adopted by this invention to solve its technical problem is: A method for preparing an aluminum stripping solution includes the following steps: S1 Raw Material Preparation: Weigh the raw material components according to the mass ratio, including 10-20 parts of sodium hydroxide, 5-12 parts of nitric acid, 1-3 parts of corrosion inhibitor, and 65-84 parts of deionized water; S2 Feeding and Mixing: Deionized water, sodium hydroxide and nitric acid are added to the preparation equipment in sequence and stirred until completely dissolved to obtain the basic mixture; S3 Corrosion Inhibitor Addition: Add corrosion inhibitor to the basic mixture, control the stirring speed to 120-300 r / min, the stirring time to 15-40 min, and control the material temperature to 25-45℃ during the process; S4 Homogenization Adjustment: After stirring, check the pH value of the mixture and adjust it to 8.5-10.5 to obtain the finished aluminum stripping solution; S5 Finished Product Discharge: Transfer the finished aluminum stripping solution to a storage container and seal it for preservation.

[0007] Preferably, the preparation equipment includes a preparation rack with a material plate on it and a material box below the material plate. A synchronization mechanism is provided between the material plate and the material box to adjust the distance between them. A mixer is mounted on the material plate. In this embodiment, the mixer can be used to mix the raw materials in the material box.

[0008] Preferably, the synchronization mechanism includes a dual-axis machine, which is mounted on top of the preparation rack and fixedly connected to it. A positive lead screw is mounted on one output shaft of the dual-axis machine 41, and a negative lead screw is located behind the positive lead screw. The negative lead screw is drivenly connected to the other output shaft of the dual-axis machine. Nuts are threaded onto the side walls of both the positive and negative lead screws. A lifting platform and a disassembly plate are respectively mounted on the two nuts. Both the lifting platform and the disassembly plate are slidably connected to the preparation rack. In this scheme, the positive and negative lead screws can be used to move the lifting platform or the disassembly plate closer to or further away from each other.

[0009] Preferably, a drive shaft is installed on the top of the reverse lead screw, and a drive wheel one is sleeved on the top of the drive shaft. A drive wheel two is sleeved on the output shaft of the dual-axis machine. The drive wheel one and the drive wheel two are connected by a drive belt one. In this scheme, the two drive wheels and the drive belt enable the positive lead screw and the reverse lead screw to rotate synchronously.

[0010] Preferably, the mixer includes an output device installed on top of the lifting platform. The material plate is located below the lifting platform and connected to it. A stirring shaft is rotatably connected to the bottom of the material plate. The stirring shaft is drivenly connected to the output shaft of the output device. A disc is installed at the bottom of the stirring shaft, and multiple blades are installed on the disc. In this design, the disc can block the axial flow of materials during the mixing process, prevent corrosion inhibitors from floating and the lower layer of sodium hydroxide solution from depositing, and force the materials to diffuse radially along the upper and lower surfaces of the disc, forming a stable circulation field. This ensures that materials at different heights in the material box can participate in the mixing, improving the overall homogeneity. The multiple blades are evenly distributed on the disc, which expands the effective mixing surface compared to traditional single-blade or double-blade structures.

[0011] Preferably, one side of the stirring shaft one has a stirring shaft two, which is connected to the stirring shaft one in a driving manner. The bottom of the stirring shaft two is equipped with blade two, which is L-shaped. In this scheme, the disc of the stirring shaft one and the blade one mainly form a radial diffusion flow field, which pushes the material to mix in the horizontal direction. When the L-shaped blade two rotates, it will generate an axial pushing force, which will tumble the material at the bottom of the material box 3 upward and drive the upper material to replenish downward, realizing three-dimensional mixing of vertical convection and radial diffusion, which greatly improves the homogenization efficiency and shortens the mixing time.

[0012] Preferably, a transmission wheel three is mounted on the output shaft of the output device, and a transmission wheel four is mounted on the stirring shaft one. The transmission wheel three and the transmission wheel four are connected by a transmission belt two. Gears are mounted on both the stirring shaft one and the stirring shaft two, and the two gears correspond to each other and mesh. In this scheme, the design of the transmission wheels and gears can rely on the fixed transmission ratio characteristic of gear meshing to ensure that the rotational speeds of the two stirring shafts are completely consistent and the directions are opposite, forming a synergistic and complementary flow field. This solves the problem of uneven material mixing and turbulent flow field caused by the speed difference when driving two shafts with multiple motors in the traditional way.

[0013] Preferably, the preparation rack has a first guide post and a second guide post. The first guide post passes through the lifting platform and is fixedly connected to the preparation rack, and the second guide post passes through the disassembly plate and is fixedly connected to the preparation rack. Guide sleeves are fitted on the side walls of both the first and second guide posts. The guide sleeve on the first guide post is fixedly connected to the lifting platform, and the guide sleeve on the second guide post is fixedly connected to the disassembly plate. The design of the guide posts and guide sleeves in this scheme can provide guidance for the lifting operation of the lifting platform and the disassembly plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The aluminum stripping solution preparation equipment provided by this preparation method automatically adjusts the distance between the material plate and the material box through a synchronization mechanism. This ensures precise docking between the mixer and the material box, improving mixing uniformity, and enables rapid separation and cleaning, significantly reducing maintenance costs and safety risks. Simultaneously, the adoption of a linkage structure with a single-output device driving dual stirring shafts simplifies the equipment structure, reduces costs and energy consumption, and ensures synchronized rotation speeds of the two shafts, forming a complementary material flow field. This further improves mixing efficiency and homogenization, effectively solving the pain points of existing technologies and significantly enhancing the efficiency and quality stability of aluminum stripping solution preparation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a frontal perspective view of the material box and material plate of the present invention when they are combined; Figure 2 This is a rear perspective view of the material box and material plate of the present invention when they are combined; Figure 3 This is a perspective view of the material box and material plate of the present invention when they are not combined; Figure 4 for Figure 3 Side view of the preparation rack; In the diagram: 1. Preparation rack; 2. Material plate; 3. Material box; 4. Synchronization mechanism; 5. Mixer; 6. Guide column one; 7. Guide column two; 8. Guide sleeve; 41. Dual-shaft machine; 42. Positive lead screw; 43. Reverse lead screw; 44. Nut; 45. Lifting platform; 46. Disassembly plate; 47. Drive shaft; 48. Drive wheel one; 49. Drive wheel two; 49. Drive belt one; 51. Output device; 52. Stirring shaft one; 53. Disc; 54. Blade one; 55. Stirring shaft two; 56. Blade two; 57. Drive wheel three; 58. Drive wheel four; 59. Drive belt two; 60. Gear. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1-4The present invention provides a technical solution: A method for preparing an aluminum stripping solution includes the following steps: S1 Raw Material Preparation: Weigh the raw material components according to the mass ratio, including 10-20 parts of sodium hydroxide, 5-12 parts of nitric acid, 1-3 parts of corrosion inhibitor, and 65-84 parts of deionized water.

[0019] Specifically, sodium hydroxide is used as the main stripping agent to peel off the oxide film / coating on the aluminum surface through alkaline hydrolysis. If the ratio is too low, the stripping speed will be slow and the effect will be poor; if it is too high, it will aggravate the corrosion of the aluminum substrate and affect the accuracy of subsequent processing. Therefore, it needs to be controlled at 10-20 parts.

[0020] Nitric acid, as an auxiliary oxidant, can dissolve insoluble impurities in the oxide film and form a buffer system with sodium hydroxide to prevent excessive local alkalinity. If the ratio is too low, it will not effectively remove impurities, while if it is too high, it will lower the pH value of the solution and weaken the film removal ability. Therefore, it needs to be controlled at 5-12 parts.

[0021] The corrosion inhibitor forms a protective film on the aluminum surface, inhibiting excessive corrosion of the substrate by sodium hydroxide. If the ratio is too low, the corrosion inhibition effect will be insufficient; if too high, it will adsorb onto the oxide film surface, hindering the film removal reaction. Therefore, the ratio needs to be controlled between 1 and 3 parts.

[0022] Deionized water: as a solvent, it ensures that all components are fully dissolved and form a homogeneous system. At the same time, it adjusts the solution concentration to avoid component agglomeration and poor flowability due to excessive concentration. Therefore, it needs to be controlled at 65-84 parts.

[0023] The component ratio of the stripping solution directly determines its stripping efficiency, corrosion inhibition effect and stability. Strictly weighing according to the mass ratio can ensure the consistency of performance between batches and avoid the decline in product yield due to fluctuations in the ratio.

[0024] S2 Feeding and Mixing: Deionized water, sodium hydroxide and nitric acid are added to the preparation equipment in sequence and stirred until completely dissolved to obtain the basic mixture.

[0025] Specifically, this feeding sequence can avoid violent reactions and control the dissolution rate; First, deionized water is added to provide a dissolving medium for sodium hydroxide and nitric acid, preventing excessively high local concentrations caused by direct mixing of solid raw materials. Sodium hydroxide is added next because it is readily soluble in water and exothermic; dissolving it first forms a stable alkaline solution. If nitric acid is added before sodium hydroxide, the acid-base neutralization reaction would be violently exothermic, leading to nitric acid volatilization and loss, as well as the generation of numerous bubbles causing material splashing, posing a safety hazard. Nitric acid is added last because its slow addition allows for thorough mixing with the alkaline solution. This gradual neutralization reaction controls the system temperature and pH, preventing violent reactions caused by localized strong acid-base contact, while ensuring complete dissolution of the nitric acid for auxiliary impurity removal. Stirring dissolution breaks down the agglomeration of raw material particles, accelerating the dissolution rate and ensuring complete dissolution of sodium hydroxide. This prevents undissolved solid particles from reaching excessively high local concentrations in subsequent steps, affecting the uniformity of the stripping solution.

[0026] Add S3 corrosion inhibitor: Add corrosion inhibitor to the base mixture, control the stirring speed to 120-300 r / min, and the stirring time to 15-40 min, while controlling the material temperature to 25-45℃.

[0027] Specifically, temperature and speed control are essential to ensure uniform dispersion of the corrosion inhibitor and prevent its failure.

[0028] The reason for delaying the addition of corrosion inhibitors is that corrosion inhibitors (such as benzotriazole) are prone to hydrolysis and failure in high-concentration alkaline solutions. Therefore, they need to be added after sodium hydroxide and nitric acid form a stable buffer system to ensure their structural stability.

[0029] The stirring speed (120-300 r / min) is controlled for the following three reasons: 1) Rotation speed is too low: The corrosion inhibitor particles cannot be fully dispersed and are prone to agglomeration, forming areas with excessively high local concentrations, resulting in uneven corrosion inhibition effect; 2) Excessive rotation speed: This will generate a large number of bubbles. These bubbles will adhere to the surface of the corrosion inhibitor, hindering its mixing with the solution, and may also cause material splashing and loss.

[0030] 3) The purpose of controlling the stirring time (15-40 min) is to ensure that the corrosion inhibitor particles are completely dispersed and evenly distributed in the solution, forming a stable molecular-level dispersion system, and ensuring that a continuous and uniform protective film is formed on the aluminum surface during subsequent use.

[0031] The material temperature is controlled below 25℃ because the solubility of the corrosion inhibitor decreases, the dispersion rate slows down, and it cannot fully play its role; while the material temperature is controlled above 45℃ because the thermal motion of the corrosion inhibitor molecules intensifies, making them prone to decomposition and failure, and at the same time, it will accelerate the volatilization of nitric acid and disrupt the balance of solution components.

[0032] S4 Homogenization Adjustment: After stirring, check the pH value of the mixture and adjust it to 8.5-10.5 to obtain the finished aluminum stripping solution.

[0033] Specifically, the pH value (8.5-10.5) of the stripping solution is a core performance indicator. A pH value below 8.5 indicates insufficient alkalinity, resulting in slow stripping speed; a pH value above 10.5 indicates excessive alkalinity, which can over-corrode the aluminum substrate, leading to excessive surface roughness. After stirring, local pH inconsistencies may exist. By monitoring and fine-tuning the pH values ​​of the upper, middle, and lower layers, a consistent pH value throughout the system can be ensured. Further stirring after adjustment eliminates local concentration differences, achieving molecular-level homogeneity of components and ensuring stable performance of the stripping solution during use.

[0034] S5 Finished Product Discharge: Transfer the finished aluminum stripping solution to a storage container and seal it for preservation.

[0035] Specifically, nitric acid in the stripping solution is volatile, and open storage can lead to an imbalance in the component ratio. At the same time, carbon dioxide in the air will react with sodium hydroxide to produce sodium carbonate, reducing the concentration of the stripping agent. Sealed storage can isolate the air, prevent the components from deteriorating, and extend the shelf life of the finished product.

[0036] For further details, please refer to Figure 1 and Figure 2 The preparation equipment includes a preparation rack 1, a material plate 2 on the preparation rack 1, a material box 3 below the material plate 2, a synchronization mechanism 4 between the material plate 2 and the material box 3, the synchronization mechanism 4 being used to adjust the distance between the material plate 2 and the material box 3, and a mixer 5 being installed on the material plate 2.

[0037] Specifically, the material bin 3 adopts a welded and rounded corner structure, which has high mechanical strength and can withstand the impact of materials during the mixing process, and is not easily deformed; the inner wall of the bin is polished, which makes it difficult for materials to remain and is easy to clean; it has good corrosion resistance and is suitable for mixing acid and alkali materials; it has good high temperature resistance and can be used for a long time at a mixing temperature of 45℃; the bottom is equipped with casters and a brake structure, which facilitates docking and transfer with the disassembly plate 46.

[0038] For further details, please refer to Figure 1 and Figure 2 The synchronization mechanism 4 includes a dual-axis machine 41, which is installed on the top of the preparation rack 1 and fixedly connected to the preparation rack 1. A positive lead screw 42 is installed on one of the output shafts of the dual-axis machine 41, and a negative lead screw 43 is located behind the positive lead screw 42. The negative lead screw 43 is connected to the other output shaft of the dual-axis machine 41. Nuts 44 are threadedly connected to the side walls of both the positive lead screw 42 and the negative lead screw 43. A lifting platform 45 and a disassembly plate 46 are respectively installed on the two nuts 44. Both the lifting platform 45 and the disassembly plate 46 are slidably connected to the preparation rack 1.

[0039] Specifically, the dual-shaft machine 41 is a dual-output shaft geared motor with high synchronization of the two output shaft speeds, ensuring that the positive lead screw 42 and the negative lead screw 43 rotate synchronously, realizing the precise reverse movement of the lifting platform 45 and the disassembly plate 46, and avoiding the misalignment of the material plate 2 and the material box 3; the torque output is stable, which can smoothly drive the mixer 5 and the material box 3 to lift synchronously, meeting the mixing depth adjustment requirements of different batches of materials.

[0040] The positive lead screw 42 and the negative lead screw 43 can be either ball screws or trapezoidal lead screws; When ball screws are selected, the transmission efficiency is as high as 90%-95%, which reduces energy consumption by 10%-15% and increases lifting speed by 20% compared with trapezoidal screws. The positioning accuracy is high, with a repeatability error of ≤±0.1mm, which can accurately control the distance between the material plate 2 and the material box 3, making it suitable for small-batch, multi-specification production scenarios. The wear is low, and the service life can be 3-5 times that of trapezoidal screws, making it suitable for continuous production with high-frequency lifting operations.

[0041] Choosing a trapezoidal lead screw reduces the procurement cost by only 50%-60% compared to a ball screw, making it suitable for small and medium-sized production enterprises with low-frequency lifting operations. It has a self-locking function, maintaining its current position after a power outage to prevent the mixing components from sliding down due to gravity, thus improving the safety of equipment operation. It also has strong impact resistance, capable of withstanding instantaneous impact loads on the hopper and materials, and is not prone to deformation.

[0042] For further details, please refer to Figure 1 and Figure 2 A drive shaft 47 is mounted on the top of the lead screw 43, and a drive wheel 48 is mounted on the top of the drive shaft 47. A drive wheel 49 is mounted on the output shaft of the dual-axis machine 41. The drive wheel 48 and the drive wheel 49 are connected by a drive belt 491.

[0043] For further details, please refer to Figure 1 , Figure 3 and Figure 4 The mixer 5 includes an output device 51, which is installed on the top of the lifting platform 45. The material plate 2 is located below the lifting platform 45 and connected to the lifting platform 45. The bottom of the material plate 2 is rotatably connected to a stirring shaft 52, which is connected to the output shaft of the output device 51. A disc 53 is installed at the bottom of the stirring shaft 52, and multiple blades 54 are installed on the disc 53.

[0044] Specifically, blade 54 is made of stainless steel arc-shaped blade. The blade adopts a curved stamping structure, which has low stirring resistance, can reduce motor energy consumption, and reduce material splashing. It can form a stable circulating field and improve the uniformity of material mixing. The surface of blade 54 is polished, which makes it less likely to stick to the material. After stirring, there is less residual material, which is easy to clean. Blade 54 and disc 53 are connected by bolts, which is convenient to disassemble and can replace blades with different curvatures according to the viscosity of the material.

[0045] For further details, please refer to Figure 1 , Figure 3 and Figure 4 A stirring shaft 52 has a stirring shaft 55 on one side, which is connected to the stirring shaft 52. A blade 56 is installed at the bottom of the stirring shaft 55, and the blade 56 is L-shaped.

[0046] Specifically, blade 56 can adopt an L-shaped integral welded structure. The vertical section can rotate close to the side wall of the material box 3 to scrape off the undissolved material remaining on the side wall and prevent the material from adhering and solidifying. The horizontal section can be close to the bottom of the material box 3 for stirring, solving the technical pain point that the traditional stirring shaft cannot reach the bottom of the material box 3 and improving the uniformity of mixing. The scraping end of the blade is treated with a wear-resistant coating to extend the service life of the blade. Blade 56 can be fixed to the stirring shaft 55 with a key connection and locking nut to ensure that the blade does not loosen during high-speed stirring, the scraping gap is stable, and the scraping effect is not poor due to excessive gap.

[0047] For further details, please refer to Figure 1 , Figure 3 and Figure 4 A transmission wheel 3 57 is mounted on the output shaft of the output device 51, and a transmission wheel 4 58 is mounted on the stirring shaft 1 52. The transmission wheels 3 57 and 4 58 are connected by a transmission belt 2 59. Gears 60 are mounted on both the stirring shaft 1 52 and the stirring shaft 2 55, and the two gears 60 correspond to each other and mesh with each other.

[0048] Specifically, gear 60 is made of 304 stainless steel forging and has a polished tooth surface, which has good corrosion resistance, can withstand material splash corrosion, and extend service life; the smooth surface makes it difficult for material to remain, and it is easy to clean; it is lightweight, which can reduce the rotational inertia of the stirring shaft and improve the response speed of speed adjustment; the tooth surface is machined by hobbing, which has high precision and low meshing noise, making it suitable for production environments with high noise requirements.

[0049] For further details, please refer to Figure 1 and Figure 2 The preparation rack 1 has a first guide post 6 and a second guide post 7. The first guide post 6 passes through the lifting platform 45 and is fixedly connected to the preparation rack 1. The second guide post 7 passes through the disassembly plate 46 and is fixedly connected to the preparation rack 1. Guide sleeves 8 are fitted on the side walls of both the first guide post 6 and the second guide post 7. The guide sleeve 8 on the first guide post 6 is fixedly connected to the lifting platform 45, and the guide sleeve 8 on the second guide post 7 is fixedly connected to the disassembly plate 46.

[0050] Specifically, guide pillar 6 and guide pillar 7 can be made of chrome-plated optical shafts. These shafts have excellent wear resistance, are not easily worn during long-term sliding, and extend the service life of the equipment; they have good rust prevention performance and can withstand the splashing corrosion of small amounts of acid and alkali materials during the preparation of aluminum stripping solution; they have a low coefficient of friction, resulting in low running resistance when mated with guide sleeve 8, reducing the operating load of the twin-shaft machine. Guide sleeve 8 can be made of copper alloy sleeve. This sleeve has strong load-bearing capacity, can stably support the weight of the lifting platform 45 and the mixer 5, and is not easily deformed; it has good wear resistance, resulting in low wear when mated with the chrome-plated optical shaft, and a long service life; it has excellent thermal conductivity, which can dissipate the heat generated by sliding friction in a timely manner, preventing the guide sleeve 8 from deforming due to overheating.

[0051] The workflow of this embodiment is as follows: Start the dual-shaft machine 41, and drive the lifting platform 45 to rise through the synchronization mechanism 4, so that the first stirring shaft 52 and the second stirring shaft 55 are in a high position to avoid collision with the blades during feeding; inject all the weighed deionized water into the material tank 3, start the output device 51, set the speed to 120 r / min, drive the first stirring shaft 52 to rotate, and drive the second stirring shaft 55 to rotate synchronously through the meshing of the gear 60; slowly add the crushed sodium hydroxide into the material tank 3 while stirring, and the feeding time is ≥5 min to avoid local overheating; after the sodium hydroxide is completely dissolved for about 10 min, slowly add nitric acid through the feeding port of the material tank 3, control the dripping rate to ≤5 mL / s, and continue stirring for 5 min to obtain the basic mixture. Maintain a stirring speed of 120 rpm and slowly add the pretreated corrosion inhibitor to the base mixture through the feed port. Adjust the output device 51 speed to 250-300 rpm for high-speed dispersion for 10 minutes, breaking up agglomerated corrosion inhibitor particles through radial cutting by blade 54 and wall scraping by blade 56. Adjust the speed to 120-180 rpm for low-speed homogenization for 5-30 minutes, with a total stirring time of 15-40 minutes. During this period, control the material temperature between 25-45℃ using a temperature control device. If the temperature is too high, activate the cooling system; if it is too low, activate the heating system. After the stirring is complete, activate the synchronization mechanism 4 to drive the lifting platform 45 to rise, detaching the stirring shaft assembly from the liquid. Open the sampling port of the material tank 3. Take 50 mL samples from the upper, middle, and lower layers of the material tank 3 using a sampling tube. The laboratory technician uses a calibrated pH meter to measure the pH value and takes the average of three measurements. If the pH value is higher than 10.5, add 10% of the solution dropwise through the feed port. Fine-tune with dilute nitric acid solution; if the pH value is below 8.5, add 5% sodium hydroxide solution to adjust; after adjustment, start output device 51, set the speed to 150 r / min, homogenize for 5 min, and take samples again for testing to confirm that the pH value is within the range of 8.5-10.5, thus obtaining the finished aluminum stripping solution. Finally, start the dual-shaft machine 41, drive the positive screw 42 to raise the lifting platform 45, and the negative screw 43 to lower the disassembly plate 46, so that the stirring shaft assembly is completely exposed and the material box 3 is lowered to the discharge height; open the discharge valve of the material box 3 and filter the finished aluminum stripping solution through a 50μm filter screen into a sealed storage container.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing an aluminum stripping solution, characterized in that, Includes the following steps: S1 Raw Material Preparation: Weigh the raw material components according to the mass ratio, including 10-20 parts of sodium hydroxide, 5-12 parts of nitric acid, 1-3 parts of corrosion inhibitor, and 65-84 parts of deionized water; S2 Feeding and Mixing: Deionized water, sodium hydroxide and nitric acid are added to the preparation equipment in sequence and stirred until completely dissolved to obtain the basic mixture; S3 Corrosion Inhibitor Addition: Add corrosion inhibitor to the basic mixture, control the stirring speed to 120-300 r / min, the stirring time to 15-40 min, and control the material temperature to 25-45℃ during the process; S4 Homogenization Adjustment: After stirring, check the pH value of the mixture and adjust it to 8.5-10.5 to obtain the finished aluminum stripping solution; S5 Finished Product Discharge: Transfer the finished aluminum stripping solution to a storage container and seal it for preservation.

2. The method for preparing an aluminum stripping solution according to claim 1, characterized in that: The preparation equipment includes a preparation rack (1), a material plate (2) on the preparation rack (1), a material box (3) below the material plate (2), a synchronization mechanism (4) between the material plate (2) and the material box (3), the synchronization mechanism (4) being used to adjust the distance between the material plate (2) and the material box (3), and a mixer (5) installed on the material plate (2).

3. The method for preparing an aluminum stripping solution according to claim 2, characterized in that: The synchronization mechanism (4) includes a dual-axis machine (41), which is installed on the top of the preparation rack (1) and fixedly connected to the preparation rack (1). A positive lead screw (42) is installed on one of the output shafts of the dual-axis machine (41), and a negative lead screw (43) is located behind the positive lead screw (42). The negative lead screw (43) is connected to the other output shaft of the dual-axis machine (41). Nuts (44) are threaded on the side walls of the positive lead screw (42) and the negative lead screw (43). A lifting platform (45) and a disassembly plate (46) are respectively installed on the two nuts (44). The lifting platform (45) and the disassembly plate (46) are slidably connected to the preparation rack (1).

4. The method for preparing an aluminum stripping solution according to claim 3, characterized in that: The top of the lead screw (43) is equipped with a drive shaft (47), and the top of the drive shaft (47) is fitted with a drive wheel (48). The output shaft of the dual-axis machine (41) is fitted with a drive wheel (49). The drive wheel (48) and the drive wheel (49) are connected by a drive belt (491).

5. The method for preparing an aluminum stripping solution according to claim 3, characterized in that: The mixer (5) includes an output device (51), which is installed on the top of the lifting platform (45). The material plate (2) is located below the lifting platform (45) and connected to the lifting platform (45). A stirring shaft (52) is rotatably connected to the bottom of the material plate (2). The stirring shaft (52) is connected to the output shaft of the output device (51). A disc (53) is installed at the bottom of the stirring shaft (52). Multiple blades (54) are installed on the disc (53).

6. The method for preparing an aluminum stripping solution according to claim 5, characterized in that: The stirring shaft one (52) has a stirring shaft two (55) on one side. The stirring shaft two (55) is connected to the stirring shaft one (52) in a driving connection. The bottom of the stirring shaft two (55) is equipped with blade two (56), which is L-shaped.

7. The method for preparing an aluminum stripping solution according to claim 5, characterized in that: The output device (51) has a transmission wheel three (57) mounted on its output shaft, and the stirring shaft one (52) has a transmission wheel four (58) mounted on its shaft. The transmission wheel three (57) and the transmission wheel four (58) are connected by a transmission belt two (59).

8. The method for preparing an aluminum stripping solution according to claim 6, characterized in that: Gears (60) are fitted on both the first stirring shaft (52) and the second stirring shaft (55), and the two gears (60) correspond to each other and mesh with each other.

9. The method for preparing an aluminum stripping solution according to claim 3, characterized in that: The preparation rack (1) has a guide post one (6) and a guide post two (7). The guide post one (6) passes through the lifting platform (45) and is fixedly connected to the preparation rack (1). The guide post two (7) passes through the disassembly plate (46) and is fixedly connected to the preparation rack (1).

10. The method for preparing an aluminum stripping solution according to claim 9, characterized in that: Guide sleeves (8) are fitted on the side walls of both the first guide post (6) and the second guide post (7). The guide sleeve (8) on the first guide post (6) is fixedly connected to the lifting platform (45), and the guide sleeve (8) on the second guide post (7) is fixedly connected to the disassembly plate (46).

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