Automatic feeding device for reaction tank

Abstract

The utility model relates to a kind of automatic feeding device of reaction tank, including reaction tank main part, the top of reaction tank main part is equipped with opening and is arranged with feed pipe in one side level, one end of feed pipe extends to reaction tank main part inside, the other end of feed pipe is connected in storage tank, and storage tank inside storage has the hydrogen fluoride solution of ready-made deployment;Reaction tank main part bottom is also equipped with circulating filter component, the other end of circulating filter component extends outward and is interconnected with feed pipe;The present application is based on the reaction of hydrogen fluoride and aluminium hydroxide, using circulating filter component, the fluorinated aluminium solution mixed to saturated state is extracted, then the part crystal inside is separated by filter membrane, and the fluorinated aluminium solution under saturated state is injected into reaction tank inside again, so crystal state fluorinated aluminium powder can be obtained continuously by above-mentioned mode, greatly improve the production efficiency of crystal state fluorinated aluminium.

Description

Technical Field

[0001] This utility model relates to the technical field of aluminum fluoride production equipment, specifically to an automatic feeding device for a reaction tank. Background Technology

[0002] Aluminum fluoride is an important inorganic compound, typically appearing as white crystals or powder. It is an ionic compound with a high melting point of approximately 1290℃ and a density of about 2.882 g / cm³. It is slightly soluble in water, and its solubility varies with temperature, acidity, alkalinity, and the presence of other ions in the solution. It is chemically stable and does not readily react with common substances at room temperature and pressure, but exhibits unique chemical reactivity in its molten state at high temperatures.

[0003] In existing aluminum fluoride preparation processes, hydrofluoric acid and aluminum hydroxide are generally reacted to produce aluminum fluoride and water through a chemical reaction. The aluminum fluoride is soluble in water in an ionic state. As the concentration continues to increase, some crystals will eventually precipitate. Workers then concentrate the solution by heating or distilling to obtain crystalline aluminum fluoride.

[0004] In the above preparation process, the entire reaction tank needs to be shut down and heated after absorption to saturate, so that aluminum fluoride crystals are precipitated. Each distillation and heating process is relatively long, making it impossible to continuously collect the aluminum fluoride inside, resulting in low production efficiency. Utility Model Content

[0005] Based on the above description, this utility model provides an automatic feeding device for a reaction tank to solve the shortcomings of the existing aluminum fluoride crystal preparation process, which requires stopping the machine to distill or heat the saturated aluminum fluoride solution to obtain crystal powder, resulting in the inability of the equipment to work continuously and affecting production efficiency.

[0006] This utility model is achieved through the following technical solution:

[0007] An automatic feeding device for a reaction tank includes a reaction tank body. The top of the reaction tank body has an opening and a conveying pipe is horizontally arranged on one side. One end of the conveying pipe extends into the interior of the reaction tank body, and the other end of the conveying pipe is connected to a storage tank containing a prepared hydrofluoric acid solution. The bottom of the reaction tank body is also provided with a circulating filter assembly. The top end of the circulating filter assembly extends upward and communicates with the interior of the electrolytic cell, and the other end of the circulating filter assembly extends outward and communicates with the conveying pipe.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the reaction tank body is also provided with a receiving cavity, and multiple injection ports are provided on the inner side wall of the reaction tank body, and each injection port is connected to the receiving cavity. The top of the receiving cavity is also provided with an interface, which is connected to the conveying pipe through a connecting flange.

[0010] Furthermore, the interface is a four-way connector, and the first interface facing outward is connected to the feed pipe, and a first solenoid valve is provided at the connection between the first interface and the feed pipe; the second interface facing outward is connected to an external water supply pipe, and a second solenoid valve is provided at the connection between the second interface and the water supply pipe; the third interface facing outward is connected to the circulating filter assembly, and a third solenoid valve is provided at the connection between the third interface and the circulating filter assembly.

[0011] Furthermore, the circulating filtration assembly includes a discharge pipe vertically disposed at the center of the bottom of the reaction tank body, filter elements arranged at intervals below the discharge pipe, an inlet pipe at the top of the filter elements and communicating with the discharge pipe, a waste removal pipe vertically disposed at the bottom of the filter elements, a collection box at the bottom of the waste removal pipe, a recovery pipe on one side of the filter elements, one side of the recovery pipe communicating with the interior of the filter elements through a branch pipe, and the other end of the recovery pipe facing upward and communicating with a third interface.

[0012] Furthermore, the filter element includes multiple filters fixed by a bracket and spaced apart in a horizontal direction. Each filter is cylindrical and has a filter element detachably installed inside. The top and bottom ends of the filter element extend to both ends of the filter and form connection holes. The bottom of the discharge pipe is provided with branch pipes and is sealed to the connection holes at the top of each filter. The waste discharge pipe is directly locked and fixed to the connection holes at the bottom of the filter by a threaded structure.

[0013] Furthermore, the filter element is configured with an inverted conical structure, and several through holes are arranged around the side wall of the filter element. The inner side wall of the filter element is also covered with a filter membrane, and the filter membrane completely covers all the through holes.

[0014] Furthermore, each branch pipe on the discharge pipe is equipped with a water valve.

[0015] Furthermore, both the material conveying pipe and the water conveying pipe are equipped with flow meters.

[0016] Furthermore, the interior of the reaction tank body is also equipped with multiple concentration measurement sensors.

[0017] Furthermore, an ultrasonic generator is provided at the bottom of the main body of the reaction tank, and the output end of the ultrasonic generator is fixedly connected to the side wall of the main body of the reaction tank.

[0018] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0019] This application improves upon existing aluminum fluoride preparation processes, still using hydrofluoric acid and aluminum hydroxide for the reaction. However, by employing a circulating filtration assembly, the saturated aluminum fluoride solution is extracted, and the precipitated crystals are separated through a filter membrane. The saturated aluminum fluoride solution is then reinjected into the reaction tank. Therefore, by continuously injecting hydrofluoric acid and aluminum hydroxide into the reaction tank in this manner, crystalline aluminum fluoride powder can be obtained uninterruptedly, greatly improving the production efficiency of crystalline aluminum fluoride. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main body of the reaction tank in this embodiment;

[0021] Figure 2 This is a schematic diagram of the interface structure in this embodiment;

[0022] Figure 3 This is a schematic diagram of the cavity structure in this embodiment;

[0023] Figure 4 This is a schematic diagram of the structure of the circulating filter component in this embodiment;

[0024] Figure 5 This is a schematic diagram of the filter element structure in this embodiment;

[0025] The components include: 1. Reactor body; 11. Receiving cavity; 12. Inlet; 13. Feed pipe; 14. Water pipe; 2. Interface; 21. First interface; 22. First solenoid valve; 23. Second interface; 24. Second solenoid valve; 25. Third interface; 26. Third solenoid valve; 3. Circulating filter assembly; 31. Discharge pipe; 32. Water valve; 33. Filter element; 34. Filter cartridge; 35. Impurity discharge pipe; 36. Recovery pipe; 4. Flow meter; 5. Ultrasonic generator. Detailed Implementation

[0026] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0028] Combination Figure 1-5 As shown, an automatic feeding device for a reaction tank includes:

[0029] The main body of the reaction tank 1 is set as a rectangular structure, and a feed pipe 13 is horizontally arranged on one side of its top to inject hydrofluoric acid solution into the main body of the reaction tank 1. The other end of the feed pipe 13 is connected to a storage tank, which contains a prepared hydrofluoric acid solution.

[0030] The circulating filter assembly 3 is located at the bottom of the reaction tank body 1 and is connected to its interior. It filters the saturated aluminum fluoride solution, separates the aluminum fluoride crystals inside, and then re-injects the aluminum fluoride solution into the reaction tank.

[0031] Specifically, in this embodiment, since the reaction tank is generally used in a large volume, in order to avoid local concentration inconsistencies due to the fixed position of the injected hydrofluoric acid solution, a receiving cavity 11 should be provided inside the reaction tank. At the same time, several injection ports 12 are provided on the inner side wall of the reaction tank body 1, and an interface 2 is provided at the top of the reaction tank. The interface 2 is set as a four-way connector, with one end facing downward and communicating with the receiving cavity 11.

[0032] In addition, the first interface 21 of the interface 2 facing outward is connected to the feed pipe 13, and a first solenoid valve 22 is provided at the connection between the first interface 21 and the feed pipe 13; the second interface 23 of the interface 2 facing outward is connected to the external water supply pipe 14, and a second solenoid valve 24 is provided at the connection between the second interface 23 and the water supply pipe 14; the third interface 25 of the interface 2 facing outward is connected to the circulating filter assembly 3, and a third solenoid valve 26 is provided at the connection between the third interface 25 and the circulating filter assembly 3.

[0033] Therefore, before the chemical reaction, a certain amount of hydrofluoric acid can be pre-injected into the reaction tank through the above-mentioned input structure, and its concentration can be adjusted by water. Moreover, by using this method of simultaneous injection through multiple injection ports 12, the coverage of hydrogen fluoride can be maximized, avoiding the concentration reduction in the area due to excessively rapid local reactions. Especially when injecting into some larger containers, this injection method can diffuse it to all areas of the entire reaction tank, thereby keeping the concentration of hydrofluoric acid uniform in all locations.

[0034] The circulating filtration assembly 3 includes a discharge pipe 31 located at the center of the bottom of the reaction tank body 1. Filter elements 33 are arranged at intervals below the discharge pipe 31. The top of the filter elements 33 is provided with an inlet pipe that communicates with the discharge pipe 31. A waste discharge pipe 35 is also vertically provided at the bottom of the filter elements 33 to discharge the aluminum fluoride particles separated by filtration. A collection box is provided at the bottom of the waste discharge pipe 35 to collect the particles for subsequent heating and drying. A recovery pipe 36 is provided on one side of the filter elements 33. One side of the recovery pipe 36 is connected to the interior of the filter elements 33 through a branch pipe. A water pump is also provided on the recovery pipe 36. The other end of the recovery pipe 36 faces upward and is connected to the third interface 25 to reintroduce the saturated aluminum fluoride solution into the reaction tank for continuous crystal precipitation.

[0035] In the above structure, the workers need to use the feed pipe above the reaction tank to discharge powdered aluminum hydroxide into the hydrofluoric acid in advance. The two react to produce aluminum fluoride and water. However, the aluminum fluoride will be hydrolyzed, so the aluminum fluoride will be in an ionic state. After the aluminum hydroxide continuously injected into the tank reacts to saturation, the solution will form a white solid. This solid is the aluminum fluoride crystal.

[0036] Therefore, in the subsequent reaction process, aluminum hydroxide and hydrofluoric acid need to be continuously fed into the reaction tank in a fixed ratio. The purpose is to always keep the solution inside the reaction tank saturated, so that aluminum fluoride crystals can be continuously formed inside, thereby achieving continuous and uninterrupted production.

[0037] Considering that the precipitated white crystals are solid and mixed in the mixed solution, and that the solution is harmful to the human body, this embodiment adopts a solid-liquid separation method to precipitate them separately, while the saturated mixed solution is discharged back into the equipment for another reaction.

[0038] Based on the above requirements, the filter element 33 in this embodiment includes a cylindrical filter fixed with the assistance of a bracket and arranged at intervals. The filter has a filter element 34 installed inside it in a detachable manner. The filter element 34 extends to the outside of the filter element 33 at both the top and bottom ends and forms a connection hole. At the same time, the discharge pipe 31 at the bottom of the reaction tank body 1 is provided with multiple branch pipes. Each branch pipe is connected to a corresponding connection hole at the top of a filter, and each branch pipe is equipped with a water valve 32. The connection hole at the bottom of the filter is connected to the impurity discharge pipe 35, and the crystals separated inside are discharged into the collection box. The connection between the impurity discharge pipe 35 and the connection hole should also be equipped with a valve that can be remotely controlled so that it can be opened periodically to wash off the crystal powder adhering to the inner wall of the filter element 34 with a certain amount of aluminum fluoride solution. After collection, it only needs to be dried to obtain aluminum fluoride powder.

[0039] In the above structure, the solution discharged into the filter element 34 contains some aluminum fluoride crystal powder. This powder will be flushed downwards with the saturated solution. Therefore, in order to expand the filtration separation area of ​​the filter element 34, it should be set as an inverted cone shape. During the separation process, a large amount of saturated solution will be flushed downwards with the inclined inner wall, which can prevent excessive crystallization from completely blocking the side wall of the filter element 34.

[0040] In addition, the filter element 34 should be covered with a filter membrane so that the staff can periodically close the water valve 32 and disconnect the valve connected to the filter via the recovery pipe 36. This allows for the sequential replacement and maintenance of the filter membranes inside multiple filters. Furthermore, in this structure, other filters can still operate normally without affecting their normal use.

[0041] In actual production, especially for large-scale production, the interior of the reaction tank 1 is appropriately heated to increase the temperature of the saturated solution. This not only evaporates the moisture in the aluminum fluoride, increasing its concentration and accelerating crystal precipitation, but also reduces the activation barrier, thus accelerating the dissolution rate. Therefore, an electric heater and a temperature sensor need to be added inside the reaction tank for real-time monitoring to maintain it within the optimal temperature range.

[0042] Simultaneously, a weighing device should be installed inside the pipe used to input aluminum hydroxide powder for quantitative conveying. This weighing device is connected to an external control console via a wire. Flow meters 4 are installed on both the feed pipe 13 and the water pipe 14. The flow meters 4 are intelligent remote radar flow meters. The control console first receives the information transmitted by the weighing device, and then controls the discharge volume of the feed pipe 13 and the water pipe 14 (i.e., remotely controls the water pumps installed on the feed pipe 13 and the water pipe 14). The flow meters 4 are used for real-time monitoring. Concentration measurement sensors (one of the following detection devices can be used: ion-selective electrode, potentiometric titrator, near-infrared spectrometer, etc.) are also provided to transmit the measured HF concentration and Al³⁺ concentration in real time. Multiple sensors should be provided for comparison to reduce measurement errors during mixing and operation, so that the ratio of aluminum hydroxide powder and hydrofluoric acid input into the reaction tank can be automatically adjusted, thus maintaining the stability of the solution inside the reaction tank for a long time.

[0043] During the discharge process, due to the accumulation of aluminum hydroxide powder and the fixed discharge inlet, aluminum hydroxide is prone to agglomerate into clumps during the initial discharge. Clumps of aluminum hydroxide are difficult to react and will seriously affect the normal operation of the entire reaction tank. Therefore, in this embodiment, an ultrasonic generator 5 is also provided at the bottom of the reaction tank. The output end of the ultrasonic generator 5 is fixedly connected to the side wall of the reaction tank through an ultrasonic transducer. Multiple generators can be set according to the size of the reaction tank, and the number of transducers can be increased accordingly. This ensures that the solution inside the reaction tank resonates simultaneously. By utilizing the cavitation effect, not only can micro-stirring be achieved, the diffusion layer on the particle surface can be washed away, and the mass transfer resistance can be reduced, allowing HF molecules to contact Al(OH)3 particles more quickly and shortening the reaction time to reach equilibrium (e.g., under the same conditions, the reaction time can be shortened by 30%~50%), but it can also reduce the reactant concentration gradient, making the reaction more uniform. At the same time, it also has a deagglomeration effect. The high-frequency vibration of the ultrasonic waves can destroy the agglomeration structure of aluminum hydroxide particles (especially soft agglomerates), dispersing large particles into smaller monomer particles, significantly increasing the solid-liquid contact area, and greatly improving the overall production efficiency of aluminum fluoride in the equipment.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of this utility model.

Claims

1. An automatic feeding device for a reaction tank, characterized in that, The reaction tank includes a main body (1), the top of which has an opening and a feed pipe (13) is arranged horizontally on one side. One end of the feed pipe (13) extends into the interior of the main body (1), and the other end of the feed pipe (13) is connected to a storage tank, which contains a prepared hydrofluoric acid solution. The bottom of the main body (1) is also provided with a circulating filter assembly (3), the top of which extends upward and communicates with the interior of the electrolytic cell, and the other end of which extends outward and communicates with the feed pipe (13).

2. The automatic feeding device for the reaction tank according to claim 1, characterized in that, The reaction tank body (1) is also provided with a receiving cavity (11). Multiple injection ports (12) are provided on the inner side wall of the reaction tank body (1), and each injection port (12) is connected to the receiving cavity (11). The top of the receiving cavity (11) is also provided with an interface (2), which is connected to the conveying pipe (13) through a connecting flange.

3. The automatic feeding device for the reaction tank according to claim 2, characterized in that, The interface (2) is a four-way connector, and the first interface (21) of the interface (2) facing outward is connected to the feed pipe (13), and a first solenoid valve (22) is provided at the connection between the first interface (21) and the feed pipe (13); the second interface (23) of the interface (2) facing outward is connected to the external water supply pipe (14), and a second solenoid valve (24) is provided at the connection between the second interface (23) and the water supply pipe (14); the third interface (25) of the interface (2) facing outward is connected to the circulating filter assembly (3), and a third solenoid valve (26) is provided at the connection between the third interface (25) and the circulating filter assembly (3).

4. The automatic feeding device for the reaction tank according to claim 3, characterized in that, The circulating filter assembly (3) includes a discharge pipe (31) vertically disposed at the center of the bottom of the reaction tank body (1). Filter elements (33) are arranged at intervals below the discharge pipe (31). The top of the filter element (33) is provided with an inlet pipe and is connected to the discharge pipe (31). The bottom of the filter element (33) is also provided with a waste removal pipe (35) vertically disposed. The bottom of the waste removal pipe (35) is provided with a storage box. A recovery pipe (36) is provided on one side of the filter element (33). One side of the recovery pipe (36) is connected to the inside of the filter element (33) through a branch pipe. The other end of the recovery pipe (36) faces upward and is connected to the third interface (25).

5. The automatic feeding device for the reaction tank according to claim 4, characterized in that, The filter element (33) includes multiple filters fixed by a bracket and spaced apart in the horizontal direction. Each filter is cylindrical and has a filter element (34) installed inside. The top and bottom ends of the filter element (34) extend to both ends of the filter and form connection holes. The bottom of the discharge pipe (31) is provided with a branch pipe and is sealed to the connection hole at the top of each filter. The waste discharge pipe (35) is directly locked to the connection hole at the bottom of the filter by a threaded structure.

6. The automatic feeding device for the reaction tank according to claim 5, characterized in that, The filter element (34) is configured as an inverted conical structure, and a number of through holes are arranged around the side wall of the filter element (34). The inner side wall of the filter element (34) is also covered with a filter membrane, and the filter membrane completely covers all the through holes.

7. The automatic feeding device for the reaction tank according to claim 6, characterized in that, Each branch pipe on the discharge pipe (31) is equipped with a water valve (32).

8. The automatic feeding device for the reaction tank according to claim 7, characterized in that, Both the material conveying pipe (13) and the water conveying pipe (14) are equipped with flow meters (4).

9. The automatic feeding device for the reaction tank according to claim 8, characterized in that, The reaction tank body (1) is also equipped with multiple concentration measurement sensors inside.

10. The automatic feeding device for the reaction tank according to claim 1, characterized in that, The bottom of the reaction tank body (1) is also provided with an ultrasonic generator (5), and the output end of the ultrasonic generator (5) is fixedly connected to the side wall of the reaction tank body (1).

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