A reaction apparatus for ammonium fluoride

Abstract

A reaction apparatus for ammonium fluoride includes a reaction vessel, a waste fluoride water storage tank, an ammonia water storage tank, and a plate and frame filter press. The reaction vessel has a waste fluoride water inlet on one side of its top, which is connected to the bottom of the waste fluoride water storage tank via a waste fluoride water delivery pipeline. A stirring motor is located at the center of the top of the reaction vessel, and the motor's shaft is connected to a stirring shaft extending into the reaction vessel. The stirring shaft is equipped with a stirring paddle assembly. Advantages of this invention: The annular pipe and multiple ammonia water injection pipes form a multi-point uniform feeding system at the bottom of the reaction vessel, allowing the ammonia water to contact the fluorosilicic acid in a more dispersed manner, increasing the contact area and accelerating the mass transfer process. The storage tank is safe and reliable, and easy to clean and drain. It has excellent corrosion resistance, effectively reducing the permeability of waste fluoride water and significantly improving corrosion resistance.

Description

Technical Field

[0001] This utility model relates to the field of cryolite production technology, specifically to a reaction device for ammonium fluoride. Background Technology

[0002] Cryolite is an alkali metal fluoroaluminate, also known as sodium fluoroaluminate, with the molecular formula Na3AlF6. As a chemical product, cryolite is mainly used as a flux in the smelting of metallic aluminum, and can also be used as an insecticide for crops, an enamel opacifier, and a light-blocking agent and flux in glass and enamel production. Ammonium fluoride is one of the raw materials for producing cryolite. The traditional process for producing ammonium fluoride generally uses direct neutralization of hydrofluoric acid (HF) and liquid ammonia. Hydrofluoric acid is as expensive as 8,000 yuan / ton, and requires high-purity raw materials, resulting in raw material costs accounting for 60%-70% of the total cost. The waste fluoride water from the wet-process phosphoric acid process in the phosphate fertilizer industry comes from the washing water after phosphoric acid extraction. It has a high concentration of fluorosilicic acid (10%~15%) and is highly acidic. Replacing hydrofluoric acid with waste fluoride water in the production of ammonium fluoride can reduce the environmental pollution caused by waste fluoride water from the phosphate fertilizer industry. Utility Model Content

[0003] The purpose of this invention is to provide a reaction apparatus for ammonium fluoride in response to the above-mentioned defects.

[0004] A reaction apparatus for ammonium fluoride includes a reaction vessel, a waste fluoride water storage tank, an ammonia water storage tank, and a plate and frame filter press. A waste fluoride water inlet is located on one side of the top of the reaction vessel, connected to the bottom of the waste fluoride water storage tank via a waste fluoride water delivery pipeline. A stirring motor is located at the center of the top of the reaction vessel, with its shaft connected to a stirring shaft extending into the reaction vessel. A stirring paddle assembly is mounted on the stirring shaft. A tail gas outlet is located on the other side of the top of the reaction vessel, connected to a tail gas delivery pipeline. A gas-liquid separator and a tail gas delivery fan are sequentially installed on the tail gas delivery pipeline. The bottom of the reaction vessel has a conical structure. The bottom is equipped with a discharge port with a discharge valve. The discharge port is connected to the feed port of the plate and frame filter press through a conveying pipe and a fluoroplastic diaphragm pump. The bottom of the reactor body is also equipped with an ammonia water inlet assembly. The ammonia water inlet assembly includes an annular pipe and multiple ammonia water injection pipes evenly arranged in a clockwise direction inside the annular pipe. The multiple ammonia water injection pipes are all horizontally arranged and have a liquid outlet at the top. The lower part of the annular pipe is equipped with multiple support rods fixed to the bottom of the reactor body. The annular pipe is also equipped with an inlet interface connected to the ammonia water inlet pipe. The ammonia water inlet pipe passes through the reactor body and is connected to an ammonia water storage tank located on one side. The ammonia water inlet pipe is equipped with an inlet valve and an ammonia water inlet pump.

[0005] The waste fluoride water storage tank includes a tank body. A waste fluoride water inlet is located on one side of the top of the tank body, and a breather valve and a venting port are located on the other side of the top of the tank body. The venting port is connected to a polyvinylidene fluoride (PVDF) pipe and an exhaust fan. The end of the PVDF pipe is connected to an alkaline absorption tower. An agitator motor is located at the center of the top of the tank body. The output shaft of the agitator motor is connected via a coupling to a solid PP stirring shaft extending into the tank body. A pair of PP blades are heat-fused to the bottom of the solid PP stirring shaft. The inner bottom surface of the tank body has a 3-5° slope. A slag discharge port with a discharge valve is located on the tank wall at the lowest point of the inner bottom surface. Above the slag discharge port is a waste fluoride water outlet with a discharge valve, which is connected to the waste fluoride water delivery pipeline. The inner wall of the tank body is also coated with a fluoride-resistant composite coating, which includes a vinyl ester resin layer, a glass flake putty layer, and a PVDF coating layer arranged sequentially.

[0006] Preferably, the tank body is made of 316L stainless steel.

[0007] Preferably, the blade edges of a pair of PP propeller blades have a rounded corner R ≥ 5 mm and a surface roughness Ra ≤ 1.6 μm.

[0008] Preferably, the venting port is provided with a shut-off valve and a check valve in sequence.

[0009] Preferably, a waste fluoride discharge port is provided 10-15cm above the slag discharge port.

[0010] Preferably, the reactor body is made of 316L stainless steel and lined with polytetrafluoroethylene.

[0011] Preferably, there are six ammonia injection pipes, and the diameter of the ammonia injection pipes is 10-15 mm.

[0012] Preferably, the exhaust gas conveying pipe is made of PP material, and the end of the exhaust gas conveying pipe is connected to the inlet of the dilute sulfuric acid packed tower.

[0013] Preferably, the waste fluoride water delivery pipeline is equipped with a drain valve, and the end of the ammonia water inlet pipe is equipped with an inlet check valve.

[0014] Preferably, the outer wall of the reactor body is also provided with a cooling water jacket for cooling.

[0015] The advantages of this invention are: the annular pipe and multiple ammonia injection pipes form a multi-point uniform feeding system at the bottom of the reactor. Compared with single-point feeding, ammonia can contact fluorosilicic acid in a more dispersed manner, increasing the contact area and accelerating the mass transfer process. The multiple ammonia injection pipes, evenly arranged clockwise inside the annular pipe, utilize fluid kinetic energy to drive the material into a turbulent state, reducing local concentration gradients and making the reaction more uniform.

[0016] Fluorosilicic acid (density approximately 1.3-1.4 g / cm³) typically has a higher density than ammonia (approximately 0.9 g / cm³). Adding ammonia from the bottom allows the low-density fluid to move upwards, creating counter-current convection with the fluorosilicic acid flowing downwards. This enhances the mixing effect and is more in line with the mass transfer logic of "density difference-driven convection" compared to adding the material from the top.

[0017] The storage tank body is safe and reliable, and easy to clean and drain. It boasts excellent corrosion resistance, effectively reducing the permeability of waste fluoride water and significantly enhancing its corrosion resistance. The coating has high hardness and toughness, resisting external impacts and wear that the waste fluoride water storage tank may experience during use, thus extending the tank's service life. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the bottom structure of the ammonia inlet assembly.

[0020] Figure 3 This is a schematic diagram of the structure of a waste fluoride water storage tank.

[0021] Figure 4 This is a schematic diagram of the structure of a fluorine-resistant composite coating. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the utility model. Furthermore, if terms such as "first" or "second" appear in the description of this utility model, they are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] As shown in the attached diagram, a reaction apparatus for ammonium fluoride includes a reaction vessel 1, a waste fluoride water storage tank 2, an ammonia water storage tank 3, and a plate and frame filter press 4. A waste fluoride water inlet 5 is located on one side of the top of the reaction vessel 1, connected to the bottom of the waste fluoride water storage tank 2 via a waste fluoride water delivery pipeline. A stirring motor 11 is located at the center of the top of the reaction vessel 1, with its shaft connected to a stirring shaft 12 extending into the reaction vessel 1. A stirring paddle assembly is mounted on the stirring shaft 12. A tail gas outlet is located on the other side of the top of the reaction vessel 1, connected to a tail gas delivery pipeline 6. A gas-liquid separator 7 and a tail gas delivery fan 8 are sequentially mounted on the tail gas delivery pipeline 6. The bottom of the reaction vessel 1 has a conical structure. The reactor body 1 is equipped with a discharge port 9 with a discharge valve. The discharge port 9 is connected to the feed port of the plate and frame filter press 4 through a conveying pipe and a fluoroplastic diaphragm pump 10. The bottom of the reactor body 1 is also equipped with an ammonia water inlet assembly. The ammonia water inlet assembly includes an annular pipe 20 and multiple ammonia water injection pipes 21 evenly arranged in a clockwise direction inside the annular pipe 20. The multiple ammonia water injection pipes 21 are all horizontally arranged and have a liquid outlet at the top. The lower part of the annular pipe 20 is equipped with multiple support rods 22 that are fixed to the bottom of the reactor body 1. The annular pipe 20 is also equipped with an inlet interface connected to the ammonia water inlet pipe 23. The ammonia water inlet pipe 23 passes through the reactor body 1 and is connected to the ammonia water storage tank 3 located on one side of it. The ammonia water inlet pipe 23 is equipped with an inlet valve and an ammonia water inlet pump 25.

[0028] The waste fluoride water storage tank 2 includes a tank body 60. A waste fluoride water inlet 61 is located on one side of the top of the tank body 60, and a breather valve 62 and a vent 63 are located on the other side of the top of the tank body 60. The vent 63 is connected to a polyvinylidene fluoride (PVDF) pipe 64 and an exhaust fan. The end of the PVDF pipe 64 is connected to an alkaline absorption tower. An agitator motor 65 is located at the center of the top of the tank body 60. The output shaft of the agitator motor 65 is connected via a coupling to a solid PP stirring shaft 66 that extends into the tank body 60. The bottom of the solid PP stirring shaft 66 is equipped with… The tank body 60 has a pair of PP blades 67 that are heat-welded to it; the inner bottom surface of the tank body 60 is provided with an inclined slope of 3-5°, and the tank wall at the lowest point of the inner bottom surface is provided with a slag discharge port 68 with a discharge valve. Above the slag discharge port 68 is a waste fluoride water discharge port 69 with a discharge valve, and the waste fluoride water discharge port 69 is connected to the waste fluoride water delivery pipeline; the inner wall of the tank body 60 is also provided with a fluoride corrosion resistant composite coating, which includes a vinyl ester resin layer 71, a glass flake putty layer 72 and a PVDF coating surface layer 73 arranged in sequence.

[0029] In another technical solution, the reactor body 1 is made of 316L stainless steel and lined with polytetrafluoroethylene. Multiple sensors are installed at different locations within the reactor body, including a temperature sensor (using a Pt100 resistance thermometer, accuracy ±0.5℃), a pH sensor (accuracy ±0.01), and a level sensor (using a magnetic level gauge, accuracy ±5mm). These sensors can monitor parameters such as temperature, pH, and level within the reactor in real time.

[0030] In another technical solution, there are six ammonia injection pipes 21, each with a diameter of 10-15 mm. If the diameter of the ammonia injection pipe is too small, it will easily become clogged; if the diameter is too large, the flow velocity will be too low to form turbulence.

[0031] In another technical solution, the exhaust gas conveying pipe is made of PP material, and the end of the exhaust gas conveying pipe 6 is connected to the inlet of the dilute sulfuric acid packed tower to avoid environmental pollution.

[0032] In another technical solution, the waste fluoride water delivery pipeline is equipped with a discharge valve, and the end of the ammonia water inlet pipe 23 is equipped with an inlet check valve.

[0033] In another technical solution, the outer wall of the reactor body 1 is also provided with a cooling water jacket 26 for cooling, so as to avoid the side reaction caused by excessive temperature.

[0034] In another technical solution, the tank body 60 is made of 316L stainless steel.

[0035] In another technical solution, the blade edges of a pair of PP blades 67 are rounded with a radius of ≥5 mm and a surface roughness of Ra≤1.6 μm.

[0036] In another technical solution, the venting port 63 is provided with a shut-off valve and a check valve in sequence.

[0037] In another technical solution, the glass flake putty is a vinyl ester glass flake putty, wherein the glass flakes have a diameter of 0.1~0.5mm and a thickness of 5~10μm.

[0038] In another technical solution, a waste fluoride water discharge port 69 is provided 10-15cm above the slag discharge port 68.

[0039] The following are the specific procedures and key technical points for fluorine corrosion resistant composite coatings:

[0040] I. Pre-construction preparation: Surface treatment of the inner wall of 316L stainless steel storage tank

[0041] Surface cleaning

[0042] Sandblasting or mechanical grinding is used to remove impurities such as oil, scale, and welding slag from the inner wall, ensuring that the surface is free of rust, dust, and moisture.

[0043] Recommended sandblasting standard: Sa2.5 (thorough sandblasting cleaning, with only slight stains or streaks remaining on the surface).

[0044] Roughness treatment

[0045] After sandblasting, the surface roughness is controlled at 50~80μm to enhance the coating adhesion (which can be detected by a roughness tester).

[0046] II. Base coat: Vinyl ester (VE) resin layer coating

[0047] The vinyl ester (VE) resin layer is made of phenolic epoxy vinyl ester resin.

[0048] Application method: Apply by brush or air spray, ensuring a uniform and complete coating. The VE resin is combined with the curing agent methyl ethyl ketone peroxide (MEKP) and the accelerator cobalt naphthenate. The amounts of the curing agent and accelerator are 1-2% and 0.5%-1% of the resin weight, respectively.

[0049] Thickness control: Dry film thickness 30~50μm (can be monitored in real time by a wet film thickness gauge).

[0050] Curing conditions: Curing at room temperature (25℃) for 24 hours. VE resin provides an initial corrosion barrier.

[0051] III. Middle Layer: Construction of 1.5 mm glass flake mortar layer

[0052] 1. Material Composition

[0053] Glass flake putty is a vinyl ester glass flake putty, with VE resin (phenolic epoxy vinyl ester resin) as the matrix, filled with 120~325 mesh glass flakes (0.1~0.5mm in diameter, 5~10μm in thickness), and added with initiators, accelerators, and fillers. Characteristics: The glass flakes are arranged in layers, which can block the penetration path of the medium and improve the coating's impermeability and wear resistance.

[0054] 2. Construction Steps

[0055] (1) Surface treatment after the primer has cured

[0056] Polish the surface of the vinyl ester (VE) resin layer to remove burrs and protrusions, and blow away dust with compressed air.

[0057] (2) Apply putty (in 2-3 layers)

[0058] First layer: Apply the putty evenly, about 0.5~0.8mm thick, press it firmly in one direction to remove air bubbles;

[0059] Subsequent layers: After the previous layer has cured (not sticky to the touch, about 12-24 hours at room temperature), apply the next layer until the total thickness is 1.5mm. Apply the layers in a cross direction to enhance the overall integrity.

[0060] (3) Defoaming and surface treatment

[0061] After each coat, roll the surface with a defoaming roller to eliminate pinholes; after the final coat, smooth the surface to ensure there are no bumps or depressions.

[0062] 3. Curing and Testing

[0063] Curing conditions: Curing at room temperature for 48 hours;

[0064] Thickness inspection: Spot checks were conducted using an electromagnetic thickness gauge. The average thickness was ≥1.5mm, and the local deviation was ≤±10%.

[0065] Defect repair: If pinholes or insufficient thickness are found, the surface needs to be sanded and then the putty applied.

[0066] IV. Topcoat: PVDF (polyvinylidene fluoride) coating

[0067] 1. Characteristics of PVDF Coatings

[0068] It is resistant to strong acids, strong alkalis, strong oxidants and organic solvents, and has excellent weather resistance. Its long-term operating temperature is -40℃ to 150℃.

[0069] Coating type: Solvent-based PVDF coating (fluorinated resin content ≥70%).

[0070] 2. Construction process

[0071] (1) Surface pretreatment

[0072] After the glass flake putty layer has cured, lightly sand the surface with sandpaper to remove burrs, and wipe it with acetone or ethanol to ensure that the surface is clean and free of oil.

[0073] (2) Coating preparation and application

[0074] Construction method: Use high-pressure airless spraying (pressure 20~30MPa) to ensure uniform coating and avoid sagging;

[0075] Dry film thickness: 50~80μm (applied in 1~2 coats, each coat with a wet film thickness of 30~50μm).

[0076] (3) Curing process

[0077] Curing at room temperature: 7 days or more (temperature ≥ 25℃, humidity ≤ 60%). Avoid contact with water or other media during the initial curing stage.

[0078] 3. Quality Control

[0079] Visual inspection: The coating surface should be smooth, free of bubbles, cracks, and missed areas;

[0080] Electric spark test: Scan with a high-frequency electric spark leak detector (voltage 1500~3000V); no breakdown points indicate it is qualified.

[0081] Adhesion test: Cross-cut test (1mm spacing), no coating peeling, adhesion ≥5MPa.

[0082] V. Key Considerations for Overall Construction

[0083] Environmental control

[0084] Construction temperature: 15~35℃, humidity: ≤85%.

[0085] Safety protection

[0086] Ventilation is required during construction, and respirators must be worn (the solvents are toxic). Open flames must be avoided.

[0087] Maintenance period

[0088] Waste fluoride water should only be injected after the coating has fully cured (at room temperature for more than 7 days) to avoid premature contact with the medium, which could cause the coating to fail.

[0089] This composite system is suitable for harsh working conditions such as fluoride-containing wastewater and strong acids and alkalis.

[0090] Working principle: Waste fluoride from the phosphate fertilizer industry (containing approximately 12% fluorosilicic acid) in the waste fluoride storage tank is added to the reactor body through the waste fluoride discharge port, waste fluoride delivery pipeline, and waste fluoride inlet. Then, the stirring motor is started. Ammonia from the ammonia storage tank is added to the reactor body through the ammonia inlet pipe and multiple ammonia injection pipes of the ammonia inlet assembly to react with the fluorosilicic acid. The reactor body temperature is controlled, and ammonia is added gradually. The pH is controlled at 8.5-9, and ammoniation takes 1-1.2 hours. To avoid ammonia volatilization during the reaction, the reaction temperature is preferably 35-40℃. An ammonolysis mixture is obtained. The ammonolysis mixture is connected to a plate and frame filter press through the discharge port, a delivery pipeline, and a fluoroplastic diaphragm pump. The filtrate is an ammonium fluoride solution.

[0091] The above-described embodiments are only intended to illustrate the technical solution and features of this utility model, and are intended to enable those skilled in the art to implement them. They should not be used to limit the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model are within the scope of protection of this utility model. Anything not described in detail is prior art.

Claims

1. A reaction apparatus for ammonium fluoride, comprising a reaction vessel (1), a waste fluoride water storage tank (2), an ammonia water storage tank (3), and a plate and frame filter press (4), characterized in that, The reactor body (1) has a waste fluoride water inlet (5) on one side of its top, which is connected to the bottom of the waste fluoride water storage tank (2) through a waste fluoride water delivery pipeline. A stirring motor (11) is located at the center of the top of the reactor body (1). The rotating shaft of the stirring motor (11) is connected to a stirring shaft (12) that extends into the reactor body (1). A stirring paddle assembly is provided on the stirring shaft (12). The other side of the top of the reactor body (1) has a tail gas outlet, which is connected to a tail gas delivery pipeline (6). A gas-liquid separator (7) and a tail gas delivery fan (8) are sequentially provided on the tail gas delivery pipeline (6). The bottom of the reactor body (1) has a conical structure. The bottom end of the reactor body (1) has a discharge port (9) with a discharge valve. The discharge port (9) is connected to the delivery pipeline. The fluoroplastic diaphragm pump (10) is connected to the feed port of the plate and frame filter press (4); the bottom of the reactor body (1) is also provided with an ammonia water inlet assembly, which includes an annular pipe (20) and multiple ammonia water injection pipes (21) evenly arranged in a clockwise direction inside the annular pipe (20). The multiple ammonia water injection pipes (21) are all horizontally arranged and have outlets at the top. The lower part of the annular pipe (20) is provided with multiple support rods (22) fixed to the bottom of the reactor body (1). The annular pipe (20) is also provided with an inlet interface connected to the ammonia water inlet pipe (23). The ammonia water inlet pipe (23) passes through the reactor body (1) and is connected to the ammonia water storage tank (3) located on one side of it. The ammonia water inlet pipe (23) is provided with an inlet valve and an ammonia water inlet pump (25). The waste fluoride water storage tank (2) includes a tank body (60). A waste fluoride water inlet port (61) is provided on one side of the top of the tank body (60), and a breather valve (62) and a vent port (63) are provided on the other side of the top of the tank body (60). The vent port (63) is connected to a polyvinylidene fluoride pipe (64) and a blower. The end of the polyvinylidene fluoride pipe (64) is connected to an alkaline absorption tower. An agitator motor (65) is located at the center of the top of the tank body (60). The output shaft of the agitator motor (65) is connected to a solid PP stirring shaft (66) extending into the tank body (60) via a coupling. 6) The bottom of the tank is provided with a pair of PP blades (67) that are heat-welded to it; the inner bottom surface of the tank body (60) is provided with a 3-5° inclined slope, and the tank wall at the lowest point of the inner bottom surface is provided with a slag discharge port (68) with a discharge valve. Above the slag discharge port (68) is a waste fluoride water discharge port (69) with a discharge valve. The waste fluoride water discharge port (69) is connected to the waste fluoride water delivery pipeline; the inner wall of the tank body (60) is also provided with a fluoride corrosion resistant composite coating, which includes a vinyl ester resin layer (71), a glass flake putty layer (72), and a PVDF coating surface layer (73) arranged in sequence.

2. The reaction apparatus for ammonium fluoride according to claim 1, characterized in that, The tank body (60) is made of 316L stainless steel.

3. The reaction apparatus for ammonium fluoride according to claim 1, characterized in that, The blade edges of a pair of PP blades (67) are rounded with a radius of ≥5 mm and a surface roughness of Ra≤1.6 μm.

4. The reaction apparatus for ammonium fluoride according to claim 1, characterized in that, The vent port (63) is provided with a shut-off valve and a check valve in sequence.

5. The reaction apparatus for ammonium fluoride according to claim 1, characterized in that, Waste fluoride water discharge port (69) is provided 10-15cm above the slag discharge port (68).

6. The reaction apparatus for ammonium fluoride according to claim 1, characterized in that, The reactor body (1) is made of 316L stainless steel and lined with polytetrafluoroethylene.

7. The reaction apparatus for ammonium fluoride according to claim 1, characterized in that, The number of ammonia injection pipes (21) is six, and the diameter of the ammonia injection pipes (21) is 10-15 mm.

8. The reaction apparatus for ammonium fluoride according to claim 1, characterized in that, The exhaust gas conveying pipe is made of PP material, and the end of the exhaust gas conveying pipe (6) is connected to the inlet of the dilute sulfuric acid packed tower.

9. A reaction apparatus for ammonium fluoride according to claim 1, characterized in that, The waste fluoride water delivery pipeline is equipped with a discharge valve, and the end of the ammonia water inlet pipe (23) is equipped with an inlet check valve.

10. A reaction apparatus for ammonium fluoride according to claim 1, characterized in that, The outer wall of the reactor body (1) is also provided with a cooling water jacket (26) for cooling.

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