The pressure stabilizing structure of the kettle environment used in the anhydrous hydrogen fluoride arsenic removal process

Abstract

The present invention discloses an environmental pressure stabilizing structure in a reactor used in an anhydrous hydrogen fluoride arsenic removal process, relating to the technical field of arsenic removal processes. The invention is based on an oxidation reaction process in the anhydrous hydrogen fluoride arsenic removal process, and proposes an improved process for a rubber septum and a lower support platform without changing the reaction process. The basic content is: utilizing the elastic deformation of the rubber septum and the supporting function of the lower support platform to change the reaction volume inside the reaction chamber, thereby playing a role in preliminarily adjusting the environmental pressure in the reaction chamber. The key lies in proposing an application method of a dual-state combined pressure stabilizing system, mainly performing a combined or independent regulation process for low-pressure and overpressure states, and also utilizing the pressure difference and pressure balance transfer principle to achieve environmental pressure stabilization in the container with the simplest and most effective structure.

Description

Technical Field

[0001] The invention relates to the technical field of arsenic removal technology, and in particular to a pressure-stabilizing structure for an environment in a kettle used in an anhydrous hydrogen fluoride arsenic removal process. Background Art

[0002] The core principle of the anhydrous hydrogen fluoride arsenic removal process is to remove arsenic impurities through oxidation and separation technology. Oxidation is essentially the oxidation of AsF3 (arsenic trifluoride) in liquid anhydrous hydrogen fluoride by fluorine gas (F2) to AsF 5（ Arsenic pentafluoride), please refer to the relevant content in publication number CN115611238A.

[0003] Explanation of the oxidation process: Referring to the reaction engineering formula (AsF3+F2→AsF5) and the reaction principle, the reaction is carried out at 5-18°C and 0-50kPaG, and there are changes in both liquid and gas phases. The liquid state has relatively low compressibility, and there are pressure changes during the replenishment and reaction consumption of the gas phase (F2), which directly lead to significant fluctuations in the reaction environment pressure in the reactor. Due to the fluctuation of the ambient pressure, the solubility of fluorine gas in the liquid phase changes significantly, causing the AsF3 oxidation efficiency to drop from 99% to below 85%. Secondly, frequent pressure changes will promote secondary reactions between HF and metal impurities (such as the formation of FeF3), increasing the workload of subsequent separation processes.

[0004] Secondly, according to the ideal gas equation, there is also a significant difference between pressure and temperature in a closed container, so the reaction temperature will also be affected under pressure fluctuations. The present invention proposes a solution to this problem. Summary of the Invention

[0005] The purpose of the present invention is to provide a pressure-stabilizing structure for the environment in the kettle used in the anhydrous hydrogen fluoride arsenic removal process. In the oxidation reaction process in the anhydrous hydrogen fluoride arsenic removal process, since there are two states, gas phase and liquid phase, and the gas phase has two actions of consumption and replenishment, which directly affects the reaction environment pressure in the kettle and directly affects the reaction efficiency in the kettle.

[0006] The object of the present invention can be achieved by the following technical solution: a pressure stabilizing structure for the environment in a kettle used in an anhydrous hydrogen fluoride arsenic removal process, comprising a kettle body and a fluorine gas replenishing structure, wherein a rubber spacer is installed at the lower end of the kettle body, and the interior of the kettle body is divided into a reaction chamber and a pressure stabilizing chamber arranged from top to bottom by the rubber spacer, and a ventilation pipe for connecting the reaction chamber and the pressure stabilizing chamber is installed on the outside of the kettle body;

[0007] A lower supporting platform is provided in the vertical direction at the position of the kettle body corresponding to the pressure stabilizing chamber, and an air injection pipe corresponding to the pressure stabilizing chamber is installed on the kettle body. The lower supporting platform is located below the rubber septum, and a push cylinder structure and a pressure sensing structure corresponding to the lower supporting platform are provided at the lower end of the kettle body;

[0008] An integrated controller is provided outside the kettle body, and the integrated controller is provided with air pressure sensors corresponding to the reaction chamber and the pressure stabilization chamber. The integrated controller is also provided with a dual-state combined pressure stabilization system associated with a fluorine gas replenishment structure, a push cylinder structure and a pressure sensing structure.

[0009] It is further configured as follows: a solenoid valve and a flow valve are provided on the ventilation pipe.

[0010] It is further configured as follows: an installation platform is installed at the lower end of the kettle body, a moving platform is installed on the installation platform for sliding in the vertical direction, the push cylinder structure and the pressure sensing structure are respectively installed on the installation platform and the moving platform, and the top end of the output shaft of the push cylinder structure is fixedly connected to the moving platform.

[0011] It is further configured as follows: the transmission rod of the pressure sensing structure is slidably connected to the kettle body and fixedly connected to the center point of the lower support platform; the pressure sensing structure is provided with a spring at the position of the transmission rod inside the kettle body.

[0012] It is further configured such that: when the solenoid valve is in an open state, fluorine gas is replenished into the pressure stabilizing chamber and the reaction chamber through the fluorine gas replenishing structure and the ventilation pipe, and liquid anhydrous hydrogen fluoride is injected into the reaction chamber, and the fluorine gas and liquid anhydrous hydrogen fluoride in the reaction chamber generate a downward liquid gravity on the rubber septum;

[0013] When the solenoid valve is in the closed state, fluorine gas is continuously added to the pressure stabilizing chamber, and the fluorine gas pressure and the lower support platform generate an upward combined support force on the rubber septum.

[0014] It is further configured as follows: the dual-state combined pressure stabilization system consists of a dual-cavity information input unit, a dual-state cross-linking analysis unit, and an action feedback unit; the dual-cavity information input unit uses QFt and QWt to ​​record the actual ambient pressure values ​​in the reaction chamber and the pressure stabilization chamber in the initial state, uses QYt to represent the pressure value of the pressure sensing structure, and marks the critical ambient pressure Qo in the reaction chamber.

[0015] It is further configured as follows: a calculation process of the gas volume ratio Mt is established in the dual-state cross-linking analysis unit, a lower limit value M1 and an upper limit value M2 are set in the gas volume ratio Mt, 0<M1<1, M2>1, when 0.93<Mt<1.05, it indicates that the ambient pressure in the reaction chamber is in an optimal state, conversely when 0.93>Mt, it indicates that a low pressure state exists in the reaction chamber; when Mt>1.05, it indicates that an overpressure state exists in the reaction chamber.

[0016] It is further configured as follows: in the action feedback unit, the following control actions are set according to the low-pressure state and the over-pressure state:

[0017] Low pressure state

[0018] Action 1: The lower support platform moves up to increase the ambient pressure in the reaction chamber;

[0019] Action 2: First, continuously pressurize the pressure stabilizing chamber, and then open the solenoid valve on the ventilation pipe to transfer the pressure balance;

[0020] Overpressure state

[0021] Action 3: Directly open the solenoid valve on the ventilation pipe to transfer the pressure balance;

[0022] Action 4: Drive the lower support platform downward to reduce the ambient pressure in the reaction chamber;

[0023] Action 5: Action 3 and action 4 are combined to start.

[0024] The present invention has the following beneficial effects:

[0025] The present invention mainly aims to improve the environmental pressure fluctuation during the oxidation reaction in the anhydrous hydrogen fluoride arsenic removal process. The overall solution mainly includes two structures: a rubber spacer and a lower support platform. Specifically, the elastic deformation process of the rubber spacer and the upper support function of the lower support platform on the rubber spacer are utilized. The basic content is: changing the environmental volume inside the reaction chamber, based on the ideal gas mode, plays a role in preliminarily adjusting the environmental pressure in the reaction chamber. The overall structure is very simple and does not require additional technical structures. The basic principle is that the rubber spacer and the lower support platform correspond to the pressure difference between the reaction chamber and the pressure stabilization chamber.

[0026] In combination with the above content, the key lies in proposing an application method of a dual-state combined pressure stabilization system, the key content of which lies in: the liquid gravity generated by the reaction chamber and the downward force generated by the pressure stabilization chamber. The liquid gravity not only includes the gravity of the liquid reactants, but also includes the environmental pressure of the reaction chamber. For this, the present invention uses pressure as the only variable and specifically proposes a method for calculating the gas volume ratio in the reaction chamber, thereby proposing two states of overpressure and underpressure. Secondly, a combined or independent control process is performed for the two states of underpressure and overpressure, which also utilizes the pressure difference and pressure balance transfer principle to achieve the environmental pressure stabilization effect in the container with the simplest and most effective structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a schematic structural diagram of the internal environment pressure stabilization structure of the kettle used in the anhydrous hydrogen fluoride arsenic removal process proposed by the present invention;

[0029] Figure 2 For the present invention Figure 1 Cross-section of the middle kettle body;

[0030] Figure 3 The present invention corresponds to Figure 2 Schematic diagram of airflow direction and force;

[0031] Figure 4 The loop structure of the ventilation pipe in the present invention;

[0032] Figure 5 Schematic diagram of the operation of the dual-state combined voltage stabilization system of the present invention.

[0033] In the figure: 1. Kettle body; 2. Integrated controller; 3. Air injection pipe; 4. Mounting platform; 5. Push cylinder structure; 6. Moving platform; 7. Pressure sensing structure; 8. Solenoid valve; 9. Ventilation pipe; 10. Flow valve; 11. Lower support platform; 12. Spring; 13. Rubber spacer. DETAILED DESCRIPTION

[0034] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] Example 1: Regarding the oxidation reaction process in the anhydrous hydrogen fluoride arsenic removal process, since there are two states, gas phase and liquid phase, and the gas phase has two actions of consumption and replenishment, which directly affects the reaction environment pressure in the kettle and directly affects the reaction efficiency in the kettle, the following technical solution is proposed:

[0036] Reference Figures 1 to 4 The pressure stabilizing structure for the environment in the kettle used in the anhydrous hydrogen fluoride arsenic removal process in this embodiment includes a kettle body 1 and a fluorine gas supply structure. A rubber spacer 13 is installed at the lower end of the kettle body 1. The rubber spacer 13 separates the interior of the kettle body 1 into a reaction chamber and a pressure stabilizing chamber arranged from top to bottom. A ventilation pipe 9 is installed on the outside of the kettle body 1 for connecting the reaction chamber and the pressure stabilizing chamber.

[0037] A lower support platform 11 is vertically arranged at the position of the kettle body 1 corresponding to the pressure stabilizing chamber, and an air injection pipe 3 corresponding to the pressure stabilizing chamber is installed on the kettle body 1. The lower support platform 11 is located below the rubber spacer 13. A push cylinder structure 5 and a pressure sensing structure 7 corresponding to the lower support platform 11 are arranged at the lower end of the kettle body 1;

[0038] An integrated controller 2 is provided on the outside of the kettle body 1. The integrated controller 2 is provided with air pressure sensors corresponding to the reaction chamber and the pressure stabilizing chamber. The integrated controller 2 is also provided with a two-state combined pressure stabilizing system with an associated fluorine gas replenishing structure, a push cylinder structure 5 and a pressure sensing structure 7. A solenoid valve 8 and a flow valve 10 are provided on the ventilation pipe 9.

[0039] Basic Principle: The present invention specifically optimizes and improves the oxidation process in the anhydrous hydrogen fluoride arsenic removal process. Its essence is to mix fluorine gas (F2) with liquid anhydrous hydrogen fluoride for reaction, and use the reaction chamber in the kettle body 1 as the reaction environment. The overall reaction environment is mainly in a high-pressure state. After adding an appropriate amount of fluorine gas, it is necessary to increase the pressure value of the reaction chamber in the kettle body 1 by means of a booster pump. As the fluorine gas is consumed during the reaction process, the ambient pressure in the reaction chamber is also indirectly reduced. In this state, the fluorine gas in the pressure-stabilizing chamber can be further transferred to the reaction chamber. However, the focus of the present invention is:

[0040] The rubber spacer 13 is borne by the difference between the liquid gravity and the downward support force on the upper and lower sides. The rubber spacer 13 is not a solid support structure, but has a certain elasticity. Therefore, when the liquid gravity is greater than the downward support force, the rubber spacer 13 is deformed downward. In contrast, when the liquid gravity is less than the downward support force, the rubber spacer 13 is deformed upward. The key to this part is to change the volume of the reaction chamber. When the volume of the reaction chamber changes, the ambient pressure in the reaction chamber will also change.

[0041] Example 2: Explanation of the force change process in the reaction chamber and the pressure stabilization chamber:

[0042] A mounting platform 4 is installed at the lower end of the kettle body 1, and a moving platform 6 is slidably installed on the mounting platform 4 in the vertical direction. A push cylinder structure 5 and a pressure sensing structure 7 are respectively installed on the mounting platform 4 and the moving platform 6. The top end of the output shaft of the push cylinder structure 5 is fixedly connected to the moving platform 6. The transmission rod of the pressure sensing structure 7 is slidably connected to the kettle body 1 and is fixedly connected to the center point of the lower support platform 11. The pressure sensing structure 7 is provided with a spring 12 at the position of the transmission rod inside the kettle body 1. When the solenoid valve 8 is in the open state, fluorine gas is replenished in the pressure stabilizing chamber and the reaction chamber through the fluorine gas replenishing structure and the ventilation pipe 9, and liquid anhydrous hydrogen fluoride is injected into the reaction chamber. The fluorine gas and liquid anhydrous hydrogen fluoride in the reaction chamber generate downward liquid gravity on the rubber septum 13;

[0043] When the solenoid valve 8 is in the closed state, fluorine gas is continuously added to the pressure stabilizing chamber, and the fluorine gas pressure and the lower supporting platform 11 generate a combined upward supporting force on the rubber spacer 13 .

[0044] Solution description: Combined with the first embodiment, the rubber septum 13 is essentially an elastic structure, so it is difficult to stably support the liquid medium inside the reaction chamber. Therefore, the lower support platform 11 is required to mechanically support the rubber septum 13 in the pressure stabilizing chamber. It can be understood that the liquid gravity includes the liquid gravity inside the reaction chamber and the internal environmental pressure of the reaction chamber, while the lower support force includes the pressure of the fluorine gas inside the pressure stabilizing chamber and the support force of the lower support platform 11 on the rubber septum 13. The specific process includes the following:

[0045] S1: In the initial state, a fixed amount of liquid medium such as liquid anhydrous hydrogen fluoride is directly injected into the reaction chamber, while maintaining the reaction chamber in a relatively closed state and opening the solenoid valve on the ventilation pipe 9. First, a fixed amount of fluorine gas is continuously injected into the pressure-stabilizing chamber through the gas injection pipe 3. Fluorine gas will also enter the reaction chamber until the amount of fluorine gas in the reaction chamber is maintained at a constant value. On the basis of maintaining the position of the lower support platform 11 unchanged, the upper support force is mainly provided to the liquid medium in the reaction chamber by the lower support platform 11 until the ambient pressure in the reaction chamber is maintained at a constant value. Then the solenoid valve 8 on the ventilation pipe 9 is closed, but fluorine gas is continued to be injected into the pressure-stabilizing chamber until a high-pressure environment is also generated inside the pressure-stabilizing chamber. It should be noted that: only fluorine gas exists in the pressure-stabilizing chamber. Finally, the ambient pressure inside the reaction chamber is increased by structures such as a booster pump;

[0046] S2: Reference Figure 2 To explain: the lower support platform 11 will also bear the liquid gravity, and the downward pressure borne by the lower support platform 11 can be sensed by the pressure sensing structure 7. However, it should be noted that: on the one hand, the lower support platform 11 will bear the gas pressure from the gas inside the pressure stabilizing chamber to generate an upward thrust, and on the other hand, the rubber septum 13 is affected by the liquid gravity to generate a downward pressure on the lower support platform 11. Therefore, the value displayed in the pressure sensing structure 7 should be the difference between the downward pressure and the upward thrust. It can be understood that: if fluorine gas is continuously injected into the pressure stabilizing chamber, resulting in the upward thrust being much greater than the downward pressure, the displayed value in the pressure sensing structure 7 is relatively small or even zero;

[0047] S3: Further explanation in combination with S2: When the platform 6 is driven to move in the up and down directions by the push cylinder structure 5, the relative position of the lower support platform 11 is changed, so that the displayed value in the pressure sensing structure 7 will also change significantly. The key is: when the lower support platform 11 moves downward, the rubber spacer 13 loses the support function of the lower support platform 11 and bends downward, thereby reducing the ambient pressure inside the reaction chamber; conversely, the solenoid valve 8 can continue to be opened, and fluorine gas can continue to be injected through the gas injection pipe 3, so that part of the fluorine gas in the pressure stabilizing chamber can be transferred to the reaction chamber.

[0048] Example 3: The dual-state combined voltage stabilization system is explained in combination with Example 1 and Example 2:

[0049] Reference Figure 5The dual-state combined pressure stabilization system consists of a dual-cavity information input unit, a dual-state cross-linking analysis unit, and an action feedback unit. Pressure sensors are set at the positions corresponding to the reaction chamber and the pressure stabilization chamber in the kettle body 1. The dual-cavity information input unit records the actual environmental pressure values ​​in the reaction chamber and the pressure stabilization chamber in the initial state through the air pressure sensor, which are represented by QFt and QWt respectively, and sets the pressure value in the pressure sensing structure 7 to QYt. The critical environmental pressure inside the reaction chamber is set to Qo according to the oxidation reaction process in the anhydrous hydrogen fluoride arsenic removal process and the structural parameters of the kettle body 1;

[0050] In the dual-state crosslinking analysis unit, the dual-chamber information input unit is initially restricted. The gas volume ratio Mt in the reaction chamber is calculated based on QFt and Qo, where Mt = QFt / Qo. A lower limit M1 and an upper limit M2 are set for the gas volume ratio Mt, where 0 < M1 < 1 and M2 > 1. In this embodiment, the lower limit M1 is set to 0.93 and the upper limit M2 is set to 1.05. When 0.93 < Mt < 1.05, the ambient pressure in the reaction chamber is at an optimal state. Conversely, when 0.93 > Mt, the reaction chamber is underpressure; and when Mt > 1.05, the reaction chamber is overpressure. This section is the basic content of the present invention.

[0051] The action feedback unit is explained in conjunction with the dual-state crosslinking analysis unit: Taking the optimal state as an example, Qo=k*(QFt-QWt). Because the gravity of the liquid in the reaction chamber and the elastic potential energy of the spring 12 need to be taken into account in actual situations, k mainly represents a conversion factor. A brief explanation of the spring 12 is given: its purpose is to prevent the lower support platform 11 from being affected by the high pressure difference and generating a large displacement fluctuation state, which affects the detection process of the pressure sensing structure 7. Therefore, in this embodiment, it is only used as a quantitative constant. The key is to perform the following action feedback process for the low-pressure state and the over-pressure state:

[0052] The following control actions exist in the low-pressure state:

[0053] Action 1: The push cylinder structure 5 generates an action command, which drives the movable platform 6 to move upward, thereby reducing the volume of the reaction chamber. Combined with the ideal gas equation, when the volume is reduced, the ambient pressure in the reaction chamber increases.

[0054] Action 2: First, continue to pressurize the pressure stabilizing chamber to make QFt < QWt, then directly open the solenoid valve on the ventilation pipe 9 to connect the reaction chamber and the pressure stabilizing chamber. According to the pressure balance principle, the internal pressures of the two chambers gradually tend to be balanced and equal. Specifically, the fluorine gas in the pressure stabilizing chamber is further transferred to the reaction chamber until the reaction chamber is maintained at the optimal state.

[0055] The following control actions exist in the overpressure state:

[0056] Action 3: Without changing the lower support platform 11, directly open the solenoid valve on the ventilation pipe 9 to use the pressure balance principle to gradually balance the internal environmental pressures of the two.

[0057] Action 4: Instead of using the solenoid valve 8, the lower support platform 11 is driven downward by the push cylinder structure 5 to indirectly reduce the internal pressure of the reaction chamber;

[0058] Action 5: On the basis of the lower supporting platform 11 moving downward, the electromagnetic valve 8 on the ventilation pipe 9 will also be opened to transfer the pressure balance.

[0059] Further explanation in conjunction with the above content: Because the rubber spacer 13 has a maximum deformation, changing the deformation degree of the rubber spacer 13 is not a priority measure. It is only used as a control action when the gas volume ratio Mt fluctuates slightly. However, when the gas volume ratio Mt fluctuates greatly, such as when Mt=1.35 or Mt=0.75, it is difficult to control the pressure difference during the deformation process of the rubber spacer 13. The following supplementary explanation of this control process is provided in conjunction with actions 1 to 5:

[0060] The key lies in the gas flow rate of fluorine gas transferred from the pressure-stabilizing chamber to the reaction chamber. Specifically, the flow valve 10 is the main body. Under low pressure, the upper limit of the pressure increase QSt of the ambient pressure in the pressure-stabilizing chamber is first calculated based on the gas volume ratio Mt under low pressure, such as the evaluation formula QSt = (1.93-Mt) * QWt. After the ambient pressure in the pressure-stabilizing chamber is maintained at QSt, the solenoid valve 8 is opened, and the flow valve 10 is controlled to control the flow rate of gas transfer to avoid excessive pressure difference affecting the reaction environment in the reaction chamber.

[0061] On the contrary, in the overpressure state, the main action is action five, and there is no need to directly discharge the fluorine gas in the pressure stabilizing chamber. First, the ambient pressure in the reaction chamber is reduced by the downward movement of the lower support platform 11, and the ambient pressure in the pressure stabilizing chamber in this state is set to QJt, because the gas can only be transferred from a high-pressure environment to a low-pressure environment, and considering that the gas temperature in the reaction chamber and the pressure stabilizing chamber is consistent, refer to the simple calculation formula PF=(P1*V1+P2*V2) / (V1+V2), where PF represents the ambient pressure after mixing, which is explained in conjunction with the present invention:

[0062] V1 and V2 represent the volumes in the reaction chamber and the pressure-stabilizing chamber, P1 and P2 are represented as QFt and QWt, and in action five, in order to satisfy the condition that the ambient pressure after mixing is 0.93<Mt<1.05, (2.05-Mt)*QFt=(QFt*V1+QJt*V2) / (V1+V2), in this way, QJt is roughly calculated in reverse, and the fluorine gas flow rate is further controlled by the flow valve 10. It should be further explained that when the lower support 11 is displaced, the ambient pressures in the reaction chamber and the pressure-stabilizing chamber will change, so the QFt and QWt used in the QSt and QJt calculation process are expressed as the values ​​after the lower support 11 is displaced.

[0063] Combined with the above content, it can be explained that the overall structure is very simple, mainly consisting of the rubber spacer 13 and the lower support platform 11. The pressure stabilization process is combined with the interactive process of air pressure difference and volume change to maintain the stability of the ambient pressure in the reaction chamber.

[0064] In summary: based on the oxidation reaction process in the anhydrous hydrogen fluoride arsenic removal process, without changing the reaction process, an improvement process for the rubber septum and the lower support platform is proposed. The basic content is: using the elastic deformation of the rubber septum and the supporting function of the lower support platform to change the reaction volume inside the reaction chamber, thereby playing a role in preliminarily adjusting the environmental pressure in the reaction chamber. The key is to propose the application method of the dual-state combined pressure stabilization system, which mainly performs combined or independent regulation processes for the two states of low pressure and overpressure. The pressure difference and pressure balance transfer principle are also used to achieve the environmental pressure stabilization effect in the container with the simplest and most effective structure.

[0065] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A pressure stabilizing structure for the environment in a kettle used in an anhydrous hydrogen fluoride arsenic removal process, comprising a kettle body (1) and a fluorine gas replenishing structure, characterized in that: A rubber spacer (13) is installed at the lower end of the interior of the kettle body (1), and the interior of the kettle body (1) is divided into a reaction chamber and a pressure stabilization chamber arranged from top to bottom by the rubber spacer (13). A ventilation pipe (9) for connecting the reaction chamber and the pressure stabilization chamber is installed on the outside of the kettle body (1); A lower supporting platform (11) is provided in the vertical direction at a position corresponding to the pressure stabilizing chamber of the kettle body (1), and an air injection pipe (3) corresponding to the pressure stabilizing chamber is installed on the kettle body (1), the lower supporting platform (11) is located below the rubber spacer (13), and a push cylinder structure (5) and a pressure sensing structure (7) corresponding to the lower supporting platform (11) are provided at the lower end of the kettle body (1); An integrated controller (2) is provided outside the kettle body (1), and the integrated controller (2) is provided with air pressure sensors corresponding to the reaction chamber and the pressure stabilization chamber, and the integrated controller (2) is also provided with a dual-state combined pressure stabilization system associated with a fluorine gas replenishment structure, a cylinder push structure (5) and a pressure sensing structure (7); The ventilation pipe (9) is provided with a solenoid valve (8) and a flow valve (10). When the solenoid valve (8) is in an open state, fluorine gas is replenished in the pressure stabilizing chamber and the reaction chamber through the fluorine gas replenishing structure and the ventilation pipe (9), and liquid anhydrous hydrogen fluoride is injected into the reaction chamber. The fluorine gas and liquid anhydrous hydrogen fluoride in the reaction chamber generate a downward liquid gravity on the rubber septum (13); When the solenoid valve (8) is in a closed state, fluorine gas is continuously added to the pressure stabilizing chamber, and an upward combined supporting force is generated on the rubber septum (13) through the fluorine gas pressure and the lower supporting platform (11).

2. The pressure stabilizing structure for the environment in the kettle used in the anhydrous hydrogen fluoride arsenic removal process according to claim 1, characterized in that: A mounting platform (4) is installed at the lower end of the kettle body (1), a movable platform (6) is slidably installed on the mounting platform (4) in a vertical direction, the push cylinder structure (5) and the pressure sensing structure (7) are respectively installed on the mounting platform (4) and the movable platform (6), and the top end of the output shaft of the push cylinder structure (5) and the movable platform (6) are fixedly connected.

3. The pressure stabilizing structure for the environment in the kettle used in the anhydrous hydrogen fluoride arsenic removal process according to claim 2, characterized in that: The transmission rod of the pressure sensing structure (7) is slidably connected to the kettle body (1) and fixedly connected to the center point of the lower support platform (11). The pressure sensing structure (7) is provided with a spring (12) at the position of the transmission rod corresponding to the inside of the kettle body (1).

4. The pressure stabilizing structure for the environment in the kettle used in the anhydrous hydrogen fluoride arsenic removal process according to claim 1, characterized in that: The dual-state combined pressure stabilization system consists of a dual-chamber information input unit, a dual-state cross-linking analysis unit, and an action feedback unit. The dual-chamber information input unit records the actual environmental pressure values ​​in the reaction chamber and the pressure stabilization chamber in the initial state with QFt and QWt, and the pressure value of the pressure sensing structure (7) with QYt, and marks the critical environmental pressure Qo in the reaction chamber.

5. The pressure stabilizing structure for the environment in the kettle used in the anhydrous hydrogen fluoride arsenic removal process according to claim 1, characterized in that: A calculation process for the gas volume ratio Mt is established in the dual-state crosslinking analysis unit. A lower limit M1 and an upper limit M2 are set for the gas volume ratio Mt. 0<M1<1, M2>1. When 0.93<Mt<1.05, it indicates that the ambient pressure in the reaction chamber is in an optimal state. Conversely, when 0.93>Mt, it indicates that the reaction chamber is in a low-pressure state; when Mt>1.05, it indicates that the reaction chamber is in an overpressure state.

6. The pressure stabilizing structure for the environment in the kettle used in the anhydrous hydrogen fluoride arsenic removal process according to claim 5, characterized in that: In the action feedback unit, the following control actions are set according to the low pressure state and the over pressure state: Low pressure state Action 1: The lower support platform (11) moves upward to increase the ambient pressure in the reaction chamber; Action 2: First, continuously pressurize the pressure stabilizing chamber, and then open the solenoid valve (8) on the ventilation pipe (9) to transfer the pressure balance; Overpressure state Action 3: directly open the solenoid valve (8) on the ventilation pipe (9) to transfer the pressure balance; Action 4: driving the lower support platform (11) to move downward to reduce the ambient pressure in the reaction chamber; Action 5: Action 3 and action 4 are combined to start.

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