Mixing mechanism for hydrofluoric acid blending

Abstract

The utility model discloses a mixing mechanism for preparing hydrofluoric acid, which comprises a mixing tank, an output pipe arranged on the lower side surface of the mixing tank, an input pipe arranged on the upper side surface of the mixing tank, and a hydrofluoric acid input pipe arranged above the mixing tank, the pressurizing assembly is arranged at one end, facing the mixing tank, of the input pipe and comprises a spray head which is obliquely arranged downwards; according to the hydrofluoric acid feeding device, hydrofluoric acid at the bottom of the mixing tank is pumped out through the output pipe through the suction assembly, and the hydrofluoric acid is re-injected into the input pipe through the backflow pipeline. Meanwhile, the pressurizing assembly sprays pure water into the mixing tank in an inclined water column form through the spray head, the impact drop point is at the hydrofluoric acid liquid input position, and the hydrofluoric acid liquid is quickly scattered to form circular flow.

Description

Technical Field

[0001] The utility model relates to a mixing mechanism for preparing hydrofluoric acid, belonging to the technical field of preparing hydrofluoric acid. Background Art

[0002] The mixing mechanism for hydrofluoric acid preparation is a device specially used for preparing and mixing hydrofluoric acid solution. Hydrofluoric acid (HF) is an extremely corrosive acidic chemical substance, which is widely used in industry, laboratories and chemical processing. High-purity hydrofluoric acid is one of the most widely used electronic chemicals in the semiconductor manufacturing process. Electronic-grade hydrofluoric acid for semiconductors is widely used in integrated circuits, solar photovoltaics and liquid crystal displays.

[0003] Existing hydrofluoric acid mixing equipment usually uses conventional stirring rods for mixing. During the preparation of hydrofluoric acid, the chemical reaction will release a large amount of heat. However, due to the strong corrosiveness of hydrofluoric acid, stirring rods made of conventional materials are easily corroded, resulting in high frequency of equipment maintenance and replacement, which increases operating costs. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model aims to provide a mixing mechanism for preparing hydrofluoric acid to solve the problems of the prior art.

[0005] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] A mixing mechanism for preparing hydrofluoric acid, comprising:

[0007] A mixing tank, wherein an output pipe is provided on the lower side of the mixing tank, an input pipe is provided on the upper side of the mixing tank, and a hydrofluoric acid input pipe is provided above the mixing tank;

[0008] A pressurizing assembly disposed at one end of the input pipe facing the mixing tank, the pressurizing assembly comprising a nozzle disposed obliquely downward;

[0009] A suction assembly connecting the output pipe and the input pipe, wherein the output route of the nozzle and the output route of the hydrofluoric acid input pipe are provided with an intersection;

[0010] The output pipe cooperates with the suction assembly to output the pure water / mixed liquid in the mixing tank;

[0011] The input pipe cooperates with the pressurizing component to guide the pure water / mixed liquid through the nozzle to form an inclined water column to impact the high-concentration hydrofluoric acid input by the hydrofluoric acid input pipe.

[0012] As a further improvement, a pure water feed pipe is also provided above the mixing tank.

[0013] As a further improvement, the outlet of the spray head is arranged obliquely downward in an arc on the inner side wall of the mixing tank.

[0014] As a further improvement, it further includes a cooling component covering a part of the input pipe, and the cooling component is a heat exchanger.

[0015] As a further improvement, the input pipe includes a guiding part connecting the suction component and the cooling component, a cooling part located inside the cooling component, and a pressurizing part connecting the cooling component and the pressurizing component.

[0016] As a further improvement, the pressurizing component further includes a spray pipe fixedly connected to the inner side of the pressurizing part facing the mixing cylinder, the spray head is installed at the end of the spray pipe, a flow dividing piece is arranged at the end of the spray head, and at least two laterally arranged outlets are arranged on the flow dividing piece. The hydrofluoric acid liquid is guided to form a high-pressure inclined water column through the outlets, and impacts the liquid inside the mixing tank along the arc angle of the inner side wall of the mixing tank.

[0017] As a further improvement, the width of the outlet gradually decreases from the middle to both sides.

[0018] As a further improvement, the included angle between the spray pipe and the ground is in the range of 60° - 70°.

[0019] As a further improvement, the diameter of the spray pipe decreases from large to small along the water flow direction, and the ratio of the diameter of the spray pipe at the water flow input end to the diameter of the spray pipe at the water flow output end is 3:1.

[0020] The beneficial effects of the present utility model are:

[0021] With the suction component of the present utility model, the hydrofluoric acid at the bottom of the mixing tank is pumped out through the output pipe and re-injected into the input pipe through the return pipe. At the same time, the pressurizing component sprays pure water into the mixing tank in the form of an inclined water column through the spray head, and the impact point is at the position where the hydrofluoric acid liquid is input, quickly dispersing the hydrofluoric acid liquid and forming a circulating flow.

[0022] To reduce the corrosiveness of the mixed liquid, the hydrofluoric acid liquid passing through the input pipe is cooled through the cooling pipe to ensure that the liquid temperature is maintained within a safe range. The cooling component covering the input pipe can be quickly mixed and cooled by the low-temperature mixed liquid impact after the liquid enters the mixing tank, reducing the corrosion of the equipment by high temperature.

[0023] Since the method of using water flow to impact the mixed liquid is adopted, the use of mechanical stirring rods is avoided, thus eliminating the problem of stirring rod corrosion. By continuously cooling the mixed liquid and impact-cooling the incoming hydrofluoric acid liquid, the influence of the heat released by the chemical reaction is reduced. With the help of the vortex and convection phenomena formed by the liquid flowing in the tank, effective heat dissipation is carried out through the tank wall to avoid local overheating.

[0024] Since there is no mechanical stirring rod, the entire system significantly reduces the metal components in direct contact with hydrofluoric acid, thus reducing the risk of equipment corrosion and damage. The natural convection and vortex stirring methods make the mixing process more uniform and efficient, effectively preventing local overheating and uneven mixing problems. Without mechanical stirring and using corrosion-resistant materials for key components, the maintenance frequency and replacement cost of the equipment are significantly reduced, improving the economy. Brief Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a partial cross-sectional schematic diagram of a mixing mechanism for hydrofluoric acid preparation of the present invention.

[0027] Figure 2 It is a three-dimensional structure schematic diagram of a mixing mechanism for hydrofluoric acid preparation of the present invention.

[0028] Figure 3 It is a side view structure schematic diagram of a mixing mechanism for hydrofluoric acid preparation of the present invention.

[0029] Figure 4 It is an enlarged schematic diagram of a pressurizing component of a partial cross-section of a mixing mechanism for hydrofluoric acid preparation of the present invention.

[0030] 1. Mixing tank; 11. Output pipe; 12. Input pipe; 13. Hydrofluoric acid input pipe; 14. Pure water feed pipe nozzle; 2. Suction component; 21. Magnetic suction pump; 3. Cooling component; 31. Heat exchanger; 121. Guiding part; 122. Cooling part; 123. Pressurizing part; 4. Pressurizing component; 41. Nozzle; 42. Spray pipe; 43. Shunt plate; 431. Output port; 5. Mixed liquid. Detailed Embodiments

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model. Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but merely represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0032] In the description of the present utility model, the terms "first", "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more, unless otherwise specifically defined.

[0033] Existing hydrofluoric acid mixing equipment usually uses conventional stirring rods for mixing. During the preparation of hydrofluoric acid, a large amount of heat is released during the chemical reaction. However, due to the strong corrosiveness of hydrofluoric acid, the stirring rods made of conventional materials are easily corroded, resulting in a relatively high frequency of equipment maintenance and replacement, increasing the operating cost. Therefore, a mixing mechanism for preparing hydrofluoric acid is designed to solve this problem.

[0034] Refer to Figures 1-4 As shown, a mixing mechanism for preparing hydrofluoric acid includes:

[0035] A mixing tank 1, an output pipe 11 is provided on the lower side of the mixing tank 1, an input pipe 12 and a hydrofluoric acid input pipe 13 arranged above the mixing tank 1 are provided on the upper side of the mixing tank 1;

[0036] A pressurizing assembly 4 is provided at one end of the input pipe 12 facing the mixing tank 1, and the pressurizing assembly 4 includes a spray head 41 arranged obliquely downward;

[0037] A suction assembly 2 connecting the output pipe 11 and the input pipe 12, and an intersection point is provided between the output route of the spray head 41 and the output route of the hydrofluoric acid input pipe 13;

[0038] Through the cooperation of the output pipe 11 and the suction assembly 2, the pure water / mixed liquid 5 inside the mixing tank is discharged;

[0039] Cooperate with the pressurization assembly 4 through the input pipe 12 to guide the pure water / mixed liquid 5 to form an inclined water column through the nozzle 41, and impact the high-concentration hydrofluoric acid input through the hydrofluoric acid input pipe 13.

[0040] When the hydrofluoric acid liquid is mixed, due to its characteristics, it needs to be kept in a sealed state. Therefore, it is necessary to ensure that the mixing tank 1, the input pipe 12, the output pipe 11, the pressurization assembly 4, the suction assembly 2, and the cooling assembly 3 are correctly connected to form a sealed processing link, and check whether each component is in good condition.

[0041] Inject the hydrofluoric acid liquid into the mixing tank 1 through the input pipe 12.

[0042] Start the suction assembly 2, pump out the hydrofluoric acid at the bottom of the mixing tank 1 through the output pipe 11, and reinject it into the input pipe 12 through the return pipeline. At the same time, the pressurization assembly 4 sprays pure water into the mixing tank 1 in the form of an inclined water column through the nozzle 41, and the impact point is at the position where the hydrofluoric acid liquid is input, quickly dispersing the hydrofluoric acid liquid and forming a circulating flow.

[0043] To reduce the corrosiveness of the mixed liquid 5, cool the hydrofluoric acid liquid passing through the input pipe 12 through the cooling pipeline to ensure that the liquid temperature is maintained within a safe range. The cooling assembly 3 wrapped around the input pipe 12 can be impacted by the low-temperature mixed liquid 5 after the liquid enters the mixing tank 1, quickly mixing to reduce its temperature and reducing the corrosion of the equipment by high temperature.

[0044] Since the method of using water flow to impact the mixed liquid 5 is adopted, the use of a mechanical stirring rod is avoided, thus eliminating the problem of corrosion of the stirring rod. And by continuously cooling the mixed liquid 5 and impact-cooling the incoming hydrofluoric acid liquid, the influence of the heat released by the chemical reaction is reduced. With the help of the eddy current and convection phenomena formed by the liquid flowing in the tank, effective heat dissipation is carried out through the tank wall to avoid local overheating.

[0045] Since there is no mechanical stirring rod, the entire system significantly reduces the metal components in direct contact with hydrofluoric acid, thus reducing the risk of corrosion and damage to the equipment. The natural convection and eddy current stirring methods make the mixing process more uniform and efficient, and can effectively prevent local overheating and uneven mixing problems. Without mechanical stirring and using corrosion-resistant materials for key components, the maintenance frequency and replacement cost of the equipment are significantly reduced, improving the economy.

[0046] The feeding assembly is arranged above the mixing tank 1. The feeding assembly includes a feeding pipe communicating with an external pure water pipe and a second feeding pipe communicating with an external high-concentration hydrofluoric acid. The raw materials are input into the mixing tank 1 through the feeding pipe and the second feeding pipe.

[0047] Among them, to improve the corrosion resistance of the pump body, in addition to being made of corrosion-resistant materials, and the suction assembly 2 adopts a magnetic pump 21 to minimize the mechanical structure in contact with hydrofluoric acid liquid.

[0048] It should be emphasized that during mixing, pure water needs to be injected in advance. After injecting a sufficient amount of pure water, hydrofluoric acid is injected. In the embodiment, all equipment in contact with the mixture 5 is made of corrosion-resistant materials.

[0049] Moreover, due to the pre-injected pure water, the pump body first contacts pure water. Only when the concentration of hydrofluoric acid liquid decreases will it enter the bottom of the lowest mixing tank 1 and contact the pump body. By setting it this way, the service life of the body can be maximally increased.

[0050] It also includes a cooling assembly 3 covering a part of the input pipe 12, and the cooling assembly 3 is a heat exchanger 31.

[0051] Keep the temperature of the liquid in the input pipe 12 within a certain range to prevent the degradation or corrosion of the pipeline material due to overheating, thereby extending the service life of the equipment.

[0052] During the reaction process, too high a temperature may cause the reaction rate to be too fast, difficult to control, and even side reactions may occur, affecting the product quality. Cooling the input pure water / mixture 5 to make its temperature low before entering the reactor can quickly disperse the hydrofluoric acid liquid. By continuously cooling, its physical properties are stabilized, ensuring the stability and controllability of the entire process flow, enabling more precise control of the reaction rate and reaction conditions, improving the purity and yield of the product, and improving the energy efficiency of the entire production system.

[0053] Among them, the heat exchanger in the cooling assembly 3 can select a double-tube plate heat exchanger 31. The double-tube plate heat exchanger 31 is a common heat exchange device. The liquid flows in the inner and outer two layers of pipes and conducts heat exchange through the pipe wall.

[0054] The inner tube generally selects corrosion-resistant materials such as polytetrafluoroethylene (PTFE), high-alloy steel, etc. By increasing the heat transfer area, such as fin design, the heat exchange efficiency is improved.

[0055] Spiral plate heat exchanger 31. The spiral plate heat exchanger 31 uses a spiral-shaped channel to improve the heat exchange efficiency and can also select corrosion-resistant materials according to needs, suitable for handling corrosive liquids. The spiral structure increases the turbulence of the fluid and promotes heat transfer.

[0056] Shell-and-tube heat exchanger 31. The shell-and-tube heat exchanger 31 has a shell containing multiple heat transfer tubes. The liquid flows inside the tubes or in the shell and conducts heat exchange through the pipe wall. It can adapt to high-pressure and high-temperature conditions. It is convenient for replacement and maintenance. Different corrosion-resistant materials can be selected according to specific needs.

[0057] Plate heat exchanger 31, which is composed of multiple partitions and conducts heat exchange through the liquid flow in the channels between the plates. It is also suitable for efficient cooling and heating. The plate design provides a large surface area, significantly improving the heat exchange efficiency. The number of plates can be adjusted according to requirements to increase or decrease the heat transfer area. It has a small footprint and is suitable for occasions with limited space.

[0058] In this embodiment, a spiral heat exchanger 31 is adopted to wrap the input pipe 12 and cool the pure water / mixed liquid 5 inside the pipe.

[0059] The input pipe 12 includes a guiding portion 121 connecting the suction assembly 2 and the cooling assembly 3, a cooling portion 122 located inside the cooling assembly 3, and a pressurizing portion 123 connecting the cooling assembly 3 and the pressurizing assembly 4.

[0060] The pure water / mixed liquid 5 enters the cooling portion 122 through the guiding portion 121 by the cooperation of the suction assembly 2 for cooling and is output through the pressurizing portion 123.

[0061] The spray pipe 42 is arranged in an arc and inclined downward on the inner side wall of the mixing tank 1.

[0062] The pressurizing assembly 4 further includes a spray pipe 42 fixedly connected to the inner side of the pressurizing portion 123 facing the mixing cylinder. The spray head 41 is installed at the end of the spray pipe 42. A flow splitting piece 43 is arranged at the end of the spray head 41. At least two laterally arranged output ports 431 are provided on the flow splitting piece 43. The hydrofluoric acid liquid is guided to form a high-pressure inclined water column through the output ports 431 and impacts the liquid inside the mixing tank 1 along the arc angle of the inner side wall of the mixing tank 1.

[0063] The output ports 431 are gradually narrowed from the middle to both sides in width. In this embodiment, it is specifically in an elliptical shape.

[0064] Since the inclined output ports 431 cause the liquid jet to spray along the arc of the inner side wall of the mixing tank 1, a lateral inclined impact can be formed, which helps to form a rotating water flow in the tank. Therefore, the included angle range between the spray pipe 42 and the ground is 60° - 70°. This helps to generate a uniform and strong liquid circulation. It ensures the rapid and uniform mixing of the liquid in the tank and avoids the phenomenon of liquid stratification.

[0065] Moreover, the arc-shaped inclined impact is relatively stable compared to the straight-through impact water column, reducing some liquid surface fluctuations.

[0066] This helps to reduce the generation of bubbles and excessive turbulence. It avoids the uneven mixing caused by excessive bubbles and possible reaction instability.

[0067] To further increase the pressure and coverage, the outlet 431 of the diverter plate 43 increases the distribution range of the liquid, so that the sprayed liquid contacts more with the liquid in the tank, thereby enhancing the mutual mixing between the liquids and improving the mixing efficiency, which helps to achieve uniform mixing more quickly and saves mixing time.

[0068] The horizontally arranged output port 431 allows the liquid near the axis and the edge to be affected, forming a multi-layered liquid flow, improving the stirring effect, breaking the non-uniformity inside the liquid more quickly, and achieving an ideal mixing effect.

[0069] To further optimize the spray pressure, the width of the outlet 431 gradually decreases from the middle to the sides, and the spray pressure in the wide middle part is relatively small, and gradually increases toward the sides, which can avoid liquid splashing due to excessive pressure and at the same time make the sprayed liquid have enough kinetic energy for mixing.

[0070] Fluid mechanics research shows that an angle of 60°-70° can generate sufficient shear force to promote mixing, get close to the landing point of hydrofluoric acid, quickly disperse the hydrofluoric acid, and not splash pure hydrofluoric acid onto the wall of the mixing tank.

[0071] This angle range is commonly used in the design of many industrial mixing equipment, which is based on years of industry practice and experience accumulation. Through experimental verification, an angle of 60°-70° can achieve the best liquid mixing effect under given conditions (pressure, flow rate, etc.).

[0072] Referring to existing successful cases, such as large-scale mixing devices in the chemical and pharmaceutical fields, the angle between the nozzle 42 and the ground is mostly in the range of 60°-70°.

[0073] Computational fluid dynamics (CFD) simulation was used to verify the injection effects at different angles, and ultimately this angle range was confirmed to be optimal.

[0074] Optimizing the spray angle makes the flow path of the liquid in the mixing tank 1 more reasonable, which helps to improve the mixing efficiency.

[0075] The appropriate spray angle reduces the direct impact of the liquid on the tank wall and prolongs the service life of the equipment. The optimized angle reduces the risk of high-pressure liquid rebound and splashing, and improves the safety of the operation process.

[0076] In engineering practice, the gradually reduced nozzle 41 design has been widely used in many industries, proving that this design can improve the uniformity and controllability of liquid injection.

[0077] According to the basic principles of hydrodynamics, when a liquid passes through a gradually narrowing pipe, its flow velocity will increase. This is based on Bernoulli's equation, where there is a complementary relationship between the pressure and velocity of the liquid during flow. Therefore, the caliber of the nozzle 42 is set to gradually decrease in the water flow direction, and the ratio of the caliber of the nozzle 42 at the water flow input end to the caliber of the nozzle 42 at the water flow output end is 3:1.

[0078] By setting the caliber of the nozzle 42 to gradually decrease, the pressure and flow velocity of the liquid can be adjusted to ensure that the ejected liquid has sufficient kinetic energy for effective mixing. By reducing the caliber, the flow velocity of the liquid can be controlled. Through experiments and simulation studies, it is found that a ratio of 3:1 can effectively increase the speed and impact force of liquid ejection, thereby enhancing the mixing effect. This ratio can ensure an increase in flow velocity while reducing turbulence and eddy currents caused by sudden changes and maintaining the stability of the jet flow.

[0079] In practical engineering applications, the ratio of 3:1 has been verified multiple times, proving that this ratio has high adaptability and reliability under various fluids and conditions.

[0080] When the liquid passes through the gradually narrowing nozzle 42, the flow velocity will increase significantly, and the ejected liquid will have greater kinetic energy. The high-kinetic-energy liquid ejection can mix more effectively with the liquid in the tank, improving the mixing efficiency. In the chemical mixing tank 1, the high-kinetic-energy ejection can break the liquid interface faster and achieve rapid and uniform mixing.

[0081] It should be noted that the device structure and drawings of the present utility model mainly describe the principle of the present utility model. Based on the technical principle of this design, the settings of the power mechanism, power supply system, and control system of the device are not fully described. However, on the premise that those skilled in the art understand the principle of the above-mentioned utility model, the specific details of its power mechanism, power supply system, and control system can be clearly obtained. The control method of the application document is to automatically control through a controller, and the control circuit of the controller can be realized by simple programming by those skilled in the art;

[0082] The standard parts used can be purchased from the market, and can also be customized according to the description in the specification and drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment all adopt conventional models in the prior art, and the components known to those skilled in the art, their structures and principles can all be learned through technical manuals or obtained through conventional experimental methods.

[0083] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A mixing mechanism for preparing hydrofluoric acid, characterized in that, include: A mixing tank (1), wherein an output pipe (11) is provided on the lower side of the mixing tank (1), an input pipe (12) is provided on the upper side of the mixing tank (1), and a hydrofluoric acid input pipe (13) is provided above the mixing tank (1); A pressurizing component (4) is arranged at one end of the input pipe (12) facing the mixing tank (1), and the pressurizing component (4) comprises a spray head (41) arranged obliquely downward; A suction assembly (2) connected to the output pipe (11) and the input pipe (12), wherein an output route of the nozzle (41) and an output route of the hydrofluoric acid input pipe (13) are provided with an intersection; The output pipe (11) cooperates with the suction assembly (2) to output the pure water / mixed liquid (5) inside the mixing tank; The input pipe (12) cooperates with the pressurizing component (4) to guide the pure water / mixed liquid (5) through the nozzle (41) to form an inclined water column, which impacts the high-concentration hydrofluoric acid input by the hydrofluoric acid input pipe (13).

2. The mixing mechanism for hydrofluoric acid preparation according to claim 1, characterized in that: It also includes a pure water feed pipe arranged above the mixing tank (1).

3. The mixing mechanism for preparing hydrofluoric acid according to claim 2, wherein: It also includes a cooling component (3) that covers a portion of the input pipe (12), and the cooling component (3) is a heat exchanger (31).

4. A mixing mechanism for preparing hydrofluoric acid according to claim 3, characterized in that: The input pipe (12) includes a guide portion (121) connecting the suction component (2) and the cooling component (3), a cooling portion (122) located inside the cooling component (3), and a pressurizing portion (123) connecting the cooling component (3) and the pressurizing component (4).

5. A mixing mechanism for preparing hydrofluoric acid according to claim 4, characterized in that: The pressurizing component (4) further comprises a nozzle (42) fixedly connected to the pressurizing portion (123) toward the inner side of the mixing barrel, the nozzle (41) being mounted at the end of the nozzle (42), a flow divider (43) being arranged at the end of the nozzle (41), and at least two transversely arranged output ports (431) being arranged on the flow divider (43) to guide the hydrofluoric acid liquid through the output ports (431) to form a high-pressure inclined water column, which is inclined along the angle of the arc surface of the inner side wall of the mixing tank (1) to impact the liquid inside the mixing tank (1).

6. The mixing mechanism for hydrofluoric acid formulation according to claim 5, characterized in that: The width of the output port (431) gradually decreases from the middle toward the two sides.

7. A mixing mechanism for preparing hydrofluoric acid according to claim 6, characterized in that: The angle between the nozzle (42) and the ground is in the range of 60°-70°.

8. A mixing mechanism for preparing hydrofluoric acid according to claim 7, characterized in that: The diameter of the nozzle (42) decreases along the water flow direction, and the ratio of the diameter of the nozzle (42) at the water flow input end to the diameter of the nozzle (42) at the water flow output end is 3:1.

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