An apparatus for concentrating fluosilicic acid

Abstract

The application discloses a device for concentrating fluosilicic acid, which is used for avoiding waste of fluorine resources. The application comprises a first fluoro-circulating tank, a second fluoro-circulating tank, a fluosilicic acid tank and a difluoro-circulating tank; the fluosilicic acid tank is connected with the first fluoro-circulating tank and the second fluoro-circulating tank through pipelines, and is used for mixing and preliminarily concentrating fluosilicic acid liquid generated after washing of the first fluoro-circulating tank and the second fluoro-circulating tank; the fluosilicic acid tank is connected with the difluoro-circulating tank through a pipeline, the fluosilicic acid tank is used for conveying the fluosilicic acid liquid to the difluoro-circulating tank through the pipeline, and the difluoro-circulating tank is used for secondarily concentrating the fluosilicic acid liquid, so as to obtain high-concentration fluosilicic acid.

Description

Technical Field

[0001] This application relates to the chemical industry, and more particularly to an apparatus for concentrating fluorosilicic acid. Background Technology

[0002] With the booming development of the chemical industry, the treatment of fluorine-containing waste gas generated during the phosphoric acid production process, a crucial link in chemical production, has received increasing attention. In the phosphoric acid extraction process, the reaction of sulfuric acid with ore releases hydrogen fluoride gas. This gas not only poses significant hazards to the environment and human health, but also results in the waste of fluorine resources if it cannot be effectively recovered and utilized. Therefore, how to properly treat these fluorine-containing waste gases and achieve efficient recovery of fluorine resources has become a critical issue that chemical enterprises urgently need to address to improve production efficiency and implement the concept of green development.

[0003] In existing technologies, extraction tail wash water is typically used to treat hydrogen fluoride gas that overflows from the reaction of sulfuric acid and ore in a phosphoric acid extraction unit. Specifically, the hydrogen fluoride gas is subjected to multiple countercurrent washes, and the resulting fluorosilicic acid liquid is fed into an underground tank. The underground tank pump then transports the fluorosilicic acid liquid to the reaction system for recovery.

[0004] However, when fluorosilicic acid liquid enters the reaction system and mixes with the phosphoric acid solution in the reaction system, the fluorine resources in the fluorosilicic acid liquid cannot be fully extracted and utilized, which will cause serious waste of fluorine resources. The wasted fluorine resources will not only harm the environment, but also increase the production costs of enterprises. Utility Model Content

[0005] To address the aforementioned technical problems, this application provides an apparatus for concentrating fluorosilicic acid.

[0006] The technical solution provided in this application is described below:

[0007] This application provides an apparatus for concentrating fluorosilicic acid, the apparatus comprising:

[0008] Phase I fluorine circulation tank, Phase II fluorine circulation tank, fluorosilicic acid tank and difluorine circulation tank;

[0009] The fluorosilicic acid tank is connected to the first-stage fluorosilicic acid circulation tank and the second-stage fluorosilicic acid circulation tank via a pipeline. The fluorosilicic acid tank is used to mix and initially concentrate the fluorosilicic acid liquid generated after washing in the first-stage fluorosilicic acid circulation tank and the second-stage fluorosilicic acid circulation tank.

[0010] The fluorosilicic acid tank is connected to the difluorinated circulating tank via a pipeline. The fluorosilicic acid tank transports the fluorosilicic acid liquid to the difluorinated circulating tank via the pipeline. The difluorinated circulating tank is used for secondary concentration of the fluorosilicic acid liquid to obtain a high concentration of fluorosilicic acid.

[0011] Optionally, the fluorosilicic acid tank is also equipped with a pressure pump, which is used to pressurize the fluorosilicic acid liquid.

[0012] Optionally, the pressurizing pump is a driven acid-resistant centrifugal pump, which is used to enhance corrosion resistance.

[0013] Optionally, the driven acid-resistant centrifugal pump is provided with a first interface and a second interface, the first interface being connected to the fluorosilicic acid tank, and the second interface being connected to the difluoro circulating tank via the pipeline.

[0014] Optionally, a filter is provided between the first interface and the fluorosilicic acid tank, the filter being used to intercept solid particles in the fluorosilicic acid liquid.

[0015] Optionally, the pipe is an overflow pipe, which is used to stabilize the fluid pressure of the fluorosilicic acid liquid.

[0016] Optionally, the nominal diameter of the overflow pipe is 80 mm.

[0017] Optionally, the overflow pipe is made of a corrosion-resistant material.

[0018] Optionally, the connections between the primary fluorine circulation tank, the secondary fluorine circulation tank, the fluorosilicic acid tank, and the secondary fluorine circulation tank and the pipeline are all made by flanges, which are used to enhance the sealing of the fluorosilicic acid liquid during transportation.

[0019] Optionally, the connection is further provided with a polytetrafluoroethylene (PTFE) sealing gasket and an annular liquid collection tank, which are used to further prevent leakage of the fluorosilicic acid liquid.

[0020] As can be seen from the above technical solutions, this application has the following advantages:

[0021] By setting up a multi-stage concentration device consisting of a primary fluorine circulation tank, a secondary fluorine circulation tank, a fluorosilicic acid tank, and a secondary fluorine circulation tank, the problem of insufficient recovery caused by mixing fluorosilicic acid liquid with phosphoric acid solution in the reaction system is solved. This application first mixes and initially concentrates the fluorosilicic acid liquid overflowing from the primary and secondary fluorine circulation tanks in the fluorosilicic acid tank, thus initially increasing the concentration of fluorosilicic acid in the liquid. Subsequently, the initially concentrated fluorosilicic acid liquid is transferred to the secondary fluorine circulation tank for secondary concentration. This two-stage concentration process effectively increases the concentration of fluorosilicic acid, ultimately yielding a high-concentration fluorosilicic acid. The entire device converts the fluorosilicic acid liquid into high-concentration fluorosilicic acid after secondary concentration, comprehensively improving the recovery rate of fluorine resources in the fluorosilicic acid liquid, achieving efficient utilization of fluorine resources and reducing production costs, while avoiding environmental harm. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the apparatus for concentrating fluorosilicic acid provided in this application. Detailed Implementation

[0023] In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and other terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to describe the relative positional relationship between the components or parts and do not specifically limit the specific installation orientation of each component or part.

[0024] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0025] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0026] Furthermore, the structures, proportions, sizes, etc., drawn in the accompanying drawings of this application are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modification to the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that this application can produce, should still fall within the scope of the technical content disclosed in this application.

[0027] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] Fluorosilicic acid is an inorganic compound with wide applications in industry, agriculture, and other fields. Industrially, it is commonly used as a chemical raw material for the preparation of fluorides and fluorosilicic acid compounds, in applications such as metal electroplating and lead electrolytic refining. In agriculture, it can be used to control wheat rust. With increasing environmental awareness and technological innovation, the recycling and utilization of fluorosilicic acid is receiving more and more attention. The continuous development of efficient extraction and purification technologies for fluorosilicic acid allows for its better application in various fields, reducing resource waste and environmental pollution.

[0029] Please see Figure 1 The apparatus for concentrating fluorosilicic acid provided in this application includes:

[0030] Phase I fluorine circulation tank 01, Phase II fluorine circulation tank 02, fluorosilicic acid tank 03, and difluorine circulation tank 05;

[0031] The fluorosilicic acid tank 03 is connected to the primary fluorosilicic acid circulation tank 01 and the secondary fluorosilicic acid circulation tank 02 via pipelines. The fluorosilicic acid tank 03 is used to mix and initially concentrate the fluorosilicic acid liquid generated after washing in the primary fluorosilicic acid circulation tank 01 and the secondary fluorosilicic acid circulation tank 02.

[0032] The fluorosilicic acid tank 03 is connected to the difluorosilicic acid circulation tank 05 via a pipeline. The fluorosilicic acid tank 03 transports the fluorosilicic acid liquid to the difluorosilicic acid circulation tank 05 via the pipeline. The difluorosilicic acid circulation tank 05 is used for secondary concentration of the fluorosilicic acid liquid to obtain a high concentration of fluorosilicic acid.

[0033] The components of the device for concentrating fluorosilicic acid provided in this application are described as follows:

[0034] Phase I Fluorine Circulation Tank 01: Phase I Fluorine Circulation Tank 01 is one of the devices in the fluorosilicic acid concentration unit that produces liquid fluorosilicic acid. It is connected to the fluorosilicic acid tank 03 via pipeline. Phase I Fluorine Circulation Tank 01 is mainly responsible for generating and overflowing liquid fluorosilicic acid after washing the industrially produced hydrogen fluoride gas, providing a basis for the subsequent mixing and preliminary concentration process of the liquid fluorosilicic acid entering the fluorosilicic acid tank 03.

[0035] Phase II Fluorine Circulation Tank 02: Phase II Fluorine Circulation Tank 02 is one of the devices in the fluorosilicic acid concentration unit that produces liquid fluorosilicic acid. It is connected to the fluorosilicic acid tank 03 via pipeline. Phase II Fluorine Circulation Tank 02 is also responsible for generating and overflowing liquid fluorosilicic acid after washing the industrially produced hydrogen fluoride gas, providing a basis for the subsequent mixing and preliminary concentration process of the liquid fluorosilicic acid entering the fluorosilicic acid tank 03.

[0036] Fluorosilicic acid tank 03: Fluorosilicic acid tank 03 is connected to the primary fluoropolymer circulation tank 01, the secondary fluoropolymer circulation tank 02, and the secondary fluoropolymer circulation tank 05 via pipelines. The tank body of fluorosilicic acid tank 03 can fully mix the fluorosilicic acid liquid from the primary fluoropolymer circulation tank 01 and the secondary fluoropolymer circulation tank 02. Utilizing the internal space and design of the tank, the fluorosilicic acid liquid is initially concentrated. Finally, the initially concentrated fluorosilicic acid liquid is transported to the secondary fluoropolymer circulation tank 05 for further processing via pipelines.

[0037] Difluorosilicic acid circulation tank 05: Difluorosilicic acid circulation tank 05 is a component of the device for concentrating fluorosilicic acid to achieve high-concentration fluorosilicic acid production. It is connected to fluorosilicic acid tank 03 via pipeline. After receiving the initially concentrated fluorosilicic acid liquid from fluorosilicic acid tank 03, difluorosilicic acid circulation tank 05 further removes water or other impurities from the fluorosilicic acid liquid through an internal circulation processing mechanism, thereby achieving secondary concentration of the fluorosilicic acid liquid and ultimately producing high-concentration fluorosilicic acid.

[0038] In practical applications, the fluorosilicic acid liquid overflowing from the primary fluoropolymer circulation tank 01 and the secondary fluoropolymer circulation tank 02 is transported to the fluorosilicic acid tank 03 via pipelines. After receiving the fluorosilicic acid liquid from the primary and secondary fluoropolymer circulation tanks 01 and 02, the fluorosilicic acid liquid from different sources is thoroughly mixed and initially concentrated within the tank. The initially concentrated fluorosilicic acid liquid is then transported to the secondary fluoropolymer circulation tank 05 via pipelines. Upon receiving the initially concentrated fluorosilicic acid liquid, the secondary fluoropolymer circulation tank 05 activates its internal circulation mechanism to remove moisture or impurities from the fluorosilicic acid liquid, allowing it to undergo secondary concentration within the tank, ultimately producing high-concentration fluorosilicic acid, thus achieving the purpose of concentrated fluorosilicic acid.

[0039] This embodiment solves the problem of insufficient recovery caused by transporting liquid fluorosilicic acid to the reaction system for mixing with phosphoric acid solution for recovery by setting up a multi-stage concentration device consisting of a primary fluorine circulation tank 01, a secondary fluorine circulation tank 02, a fluorosilicic acid tank 03, and a secondary fluorine circulation tank 05. First, the liquid fluorosilicic acid overflowing from the primary and secondary fluorine circulation tanks 01 and 02 is mixed and initially concentrated in the fluorosilicic acid tank 03, thus initially increasing the concentration of fluorosilicic acid in the liquid. Then, the initially concentrated liquid fluorosilicic acid is transported to the secondary fluorine circulation tank 05 for secondary concentration. This two-stage concentration process effectively increases the concentration of fluorosilicic acid, ultimately yielding high-concentration fluorosilicic acid. The entire device converts the liquid fluorosilicic acid into high-concentration fluorosilicic acid after secondary concentration, comprehensively improving the recovery rate of fluorine resources in the liquid fluorosilicic acid, achieving efficient utilization of fluorine resources and reducing production costs, while avoiding environmental harm.

[0040] In an optional embodiment, the fluorosilicic acid tank 03 is further provided with a pressure pump 04, which is used to pressurize the fluorosilicic acid liquid.

[0041] In this embodiment, a method for implementing a fluorosilicic acid tank 03 is provided. A pressure pump 04 is added to the fluorosilicic acid tank 03. The pressure pump 04 is connected to the inside of the fluorosilicic acid tank 03 through a pipeline to form a pressure channel. When fluorosilicic acid liquid flows into the fluorosilicic acid tank 03 from the primary fluorosilicic acid circulation tank 01 and the secondary fluorosilicic acid circulation tank 02, the pressure pump 04 is activated to apply pressure to the fluorosilicic acid liquid in the tank.

[0042] Under pressure, the molecular motion of the fluorosilicic acid liquid intensifies, the mixing speed accelerates, and the substances inside the fluorosilicic acid liquid come into more complete contact and react, thus speeding up the mixing process and improving the initial concentration efficiency of the fluorosilicic acid liquid in the fluorosilicic acid tank 03. Simultaneously, when the pressurized fluorosilicic acid liquid is transported to the difluorinated circulating tank 05, the pressure allows it to pass through the pipeline more smoothly, reducing transport delays or flow instability caused by pipeline resistance.

[0043] In an optional embodiment, the pressure pump 04 is a driven acid-resistant centrifugal pump, which is used to enhance corrosion resistance.

[0044] This embodiment provides an implementation of a pressure pump 04, specifically a driven acid-resistant centrifugal pump. The driven acid-resistant centrifugal pump is connected to the interior of the fluorosilicic acid tank 03 via a pipeline, and its acid-resistant material allows it to operate stably in the environment of fluorosilicic acid liquid.

[0045] When the driven acid-resistant centrifugal pump is working, the impeller rotates at high speed under the drive of the drive unit, generating centrifugal force to draw the fluorosilicic acid liquid from the fluorosilicic acid tank 03 into the pump body and output the fluorosilicic acid liquid at a high pressure. Because fluorosilicic acid liquid is highly corrosive, and the driven acid-resistant centrifugal pump is made of acid-resistant materials, it can effectively resist the corrosive effects of the fluorosilicic acid liquid, ensuring that the pump body will not be damaged by corrosion during long-term contact with the fluorosilicic acid liquid, and continuously providing stable pressurization power for the fluorosilicic acid liquid.

[0046] In an optional embodiment, the driven acid-resistant centrifugal pump is provided with a first interface and a second interface. The first interface is connected to the fluorosilicic acid tank 03, and the second interface is connected to the difluoro circulating tank 05 via a pipeline.

[0047] In this embodiment, a method for implementing a driven acid-resistant centrifugal pump is provided. The first interface of the driven acid-resistant centrifugal pump is connected to the fluorosilicic acid tank 03 through a sealed pipe, forming a suction channel for the fluorosilicic acid liquid. This ensures that the mixed fluorosilicic acid liquid in the fluorosilicic acid tank 03 can smoothly enter the pump body, avoiding the problem of pump body running dry or low efficiency due to poor suction. The second interface is directly connected to the difluorosilicic acid circulation tank 05 through a pipe, serving as the output channel for the pressurized fluorosilicic acid liquid, providing a stable material input for the secondary concentration of the difluorosilicic acid circulation tank 05.

[0048] When the centrifugal pump starts, the mixed fluorosilicic acid liquid in the fluorosilicic acid tank 03 is drawn into the pump from the first port under the centrifugal force generated by the rotation of the pump impeller. After being pressurized, the fluorosilicic acid liquid with higher pressure is stably transported to the difluorine circulation tank 05 through the second port along the pipeline.

[0049] In an optional embodiment, a filter is provided between the first interface and the fluorosilicic acid tank 03, the filter being used to intercept solid particles in the fluorosilicic acid liquid.

[0050] In this embodiment, a filter is also provided between the first port of the driven acid-resistant centrifugal pump and the fluorosilicic acid tank 03. When the fluorosilicic acid liquid in the fluorosilicic acid tank 03 flows towards the first port under the suction of the centrifugal pump, the solid particles mixed in the fluorosilicic acid liquid are intercepted by the filter. These solid particles cannot pass through the fine pores of the filter and can only remain in the filter, while the liquid fluorosilicic acid liquid can easily pass through the filter and enter the driven acid-resistant centrifugal pump through the first port.

[0051] By setting up a filter, solid particles in the fluorosilicic acid liquid can be effectively intercepted, greatly reducing the risk of solid particles entering the driven acid-resistant centrifugal pump. This prevents the pump body, impeller, seals, and other key components of the driven acid-resistant centrifugal pump from having their service life shortened due to wear. Furthermore, the fluorosilicic acid liquid is filtered before entering the subsequent concentration stage, which helps to improve the purity and quality of the final high-concentration fluorosilicic acid produced.

[0052] In an optional embodiment, the conduit is an overflow conduit used to stabilize the fluid pressure of the fluorosilicic acid liquid.

[0053] In this embodiment, a pipeline implementation method is provided, wherein the connecting pipelines between the primary fluorine circulation tank 01 and the fluorosilicic acid tank 03, the secondary fluorine circulation tank 02 and the fluorosilicic acid tank 03, and the fluorosilicic acid tank 03 and the secondary fluorine circulation tank 05 are all overflow pipelines, so as to achieve the effect of stable transportation of fluorosilicic acid liquid. For example, when the fluorosilicic acid liquid overflows from the primary fluorine circulation tank 01, the overflow pipeline can directly transfer the overflowed fluorosilicic acid liquid to the fluorosilicic acid tank 03, and the flow rate of the fluorosilicic acid liquid can be effectively controlled during the transmission process to prevent the pipeline from breaking or being damaged due to excessive flow pressure.

[0054] In one alternative embodiment, the nominal diameter of the overflow pipe is 80 mm.

[0055] In this embodiment, the nominal diameter of the overflow pipe is 80 mm. In the entire fluorosilicic acid concentration device, the primary fluorosilicic acid circulation tank 01, the secondary fluorosilicic acid circulation tank 02, and the fluorosilicic acid tank 03 are all connected by overflow pipes with a nominal diameter of 80 mm. Using an overflow pipe with a nominal diameter of 80 mm allows for the smooth passage of fluorosilicic acid liquid while effectively controlling the fluid flow rate.

[0056] In an optional embodiment, the overflow pipe is made of a corrosion-resistant material.

[0057] In this embodiment, the overflow pipe is made of a corrosion-resistant material, primarily due to the highly corrosive nature of fluorosilicic acid liquid. In the fluorosilicic acid concentration device, the overflow pipe plays a crucial role in transporting the fluorosilicic acid liquid throughout the entire process, from the primary fluorosilicic acid circulation tank 01, the secondary fluorosilicic acid circulation tank 02 to the fluorosilicic acid tank 03, and finally to the secondary fluorosilicic acid circulation tank 05. The corrosion-resistant material of the overflow pipe effectively resists the erosion of the inner wall by the fluorosilicic acid liquid, ensuring the integrity and stability of the overflow pipe structure.

[0058] In an optional embodiment, the connections between the primary fluoropolymer circulation tank 01, the secondary fluoropolymer circulation tank 02, the fluorosilicic acid tank 03, and the secondary fluoropolymer circulation tank 05 and the pipeline are all made by flanges, which are used to enhance the sealing of the fluorosilicic acid liquid during transportation.

[0059] In this embodiment, flange connections are used at the joints between the primary fluoropolymer circulation tank 01, the secondary fluoropolymer circulation tank 02, the fluorosilicic acid tank 03, and the secondary fluoropolymer circulation tank 05 and the pipelines. During the transportation of fluorosilicic acid liquid, the flanges form a sealing barrier through the tightening force of the bolts, preventing the fluorosilicic acid liquid from leaking from the joints.

[0060] In an optional embodiment, the connection is further provided with a polytetrafluoroethylene (PTFE) gasket and an annular collection tank, which are used to further prevent leakage of fluorosilicic acid liquid.

[0061] In this embodiment, polytetrafluoroethylene (PTFE) gaskets and annular collection tanks are also installed at the flange connections of the primary fluoropolymer circulation tank 01, the secondary fluoropolymer circulation tank 02, the fluorosilicic acid tank 03, and the secondary fluoropolymer circulation tank 05 to the pipelines. The PTFE gaskets are soft and have excellent corrosion resistance. Placed between the flanges, the gaskets are compressed and deformed when the bolts are tightened, tightly filling the tiny gaps between the flange faces, forming the first leak-proof barrier and preventing fluorosilicic acid liquid from seeping out from the flange connection. The annular collection tank is located around the flange connection, with a drainage channel at its bottom. When a small amount of fluorosilicic acid liquid breaks through the PTFE gasket's defenses and seeps out, it flows into the annular collection tank, forming a second leak-proof barrier, further eliminating the possibility of fluorosilicic acid liquid leaking to the outside and ensuring the sealing and safety of the entire concentrated fluorosilicic acid device.

[0062] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for concentrating fluorosilicic acid, characterized in that, The device includes a primary fluorine circulation tank, a secondary fluorine circulation tank, a fluorosilicic acid tank, and a difluorine circulation tank. The fluorosilicic acid tank is connected to the first-stage fluorosilicic acid circulation tank and the second-stage fluorosilicic acid circulation tank via a pipeline. The fluorosilicic acid tank is used to mix and initially concentrate the fluorosilicic acid liquid generated after washing in the first-stage fluorosilicic acid circulation tank and the second-stage fluorosilicic acid circulation tank. The fluorosilicic acid tank is connected to the difluorinated circulating tank via a pipeline. The fluorosilicic acid tank transports the fluorosilicic acid liquid to the difluorinated circulating tank via the pipeline. The difluorinated circulating tank is used for secondary concentration of the fluorosilicic acid liquid to obtain a high concentration of fluorosilicic acid.

2. The apparatus according to claim 1, characterized in that, The fluorosilicic acid tank is also equipped with a pressure pump, which is used to pressurize the fluorosilicic acid liquid.

3. The apparatus according to claim 2, characterized in that, The pressurizing pump is a driven acid-resistant centrifugal pump, which is used to enhance corrosion resistance.

4. The apparatus according to claim 3, characterized in that, The driven acid-resistant centrifugal pump is provided with a first interface and a second interface. The first interface is connected to the fluorosilicic acid tank, and the second interface is connected to the difluoro circulating tank via the pipeline.

5. The apparatus according to claim 4, characterized in that, A filter is provided between the first interface and the fluorosilicic acid tank, and the filter is used to intercept solid particles in the fluorosilicic acid liquid.

6. The apparatus according to claim 1, characterized in that, The pipe is an overflow pipe, which is used to stabilize the fluid pressure of the fluorosilicic acid liquid.

7. The apparatus according to claim 6, characterized in that, The nominal diameter of the overflow pipe is 80 mm.

8. The apparatus according to claim 6, characterized in that, The overflow pipe is made of a corrosion-resistant material.

9. The apparatus according to claim 1, characterized in that, The connection points of the primary fluorine circulation tank, the secondary fluorine circulation tank, the fluorosilicic acid tank, and the secondary fluorine circulation tank to the pipeline are all connected by flanges, which are used to enhance the sealing of the fluorosilicic acid liquid during transportation.

10. The apparatus according to claim 9, characterized in that, The connection is also provided with a polytetrafluoroethylene (PTFE) sealing gasket and an annular liquid collection tank, which are used to further prevent the leakage of the fluorosilicic acid liquid.

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