A fluorine-loaded aluminum oxide secondary reaction device and method

Abstract

The present invention belongs to the technical field of electrolytic aluminum, and in particular relates to a fluorine-loaded alumina secondary reaction device, comprising a reactor, an electrolytic cell, and a silo. One inlet of the reactor is connected to the exhaust pipe of the electrolytic cell, and the other inlet of the reactor is connected to the fresh alumina delivery pipe. A discharge pipe is provided at the bottom of the reactor, and the discharge pipe includes two discharge branches, one of which is connected to the inlet of the reactor through a reflux pipe, and the other is delivered to the silo of the electrolysis workshop through an electrolysis raw material pipeline. The provision of a dual adsorbent system reduces the consumption of fresh alumina, improves the reaction efficiency of the adsorption process, ensures the effective control of the hydrogen fluoride content in the flue gas, and increases the fluorine content in the fluorine-loaded alumina, which is crucial for maintaining the stability and safety of the system.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrolytic aluminum, and in particular relates to a fluorine-loaded aluminum oxide secondary reaction device and method. Background Art

[0002] The pollutants generated during the electrolysis of alumina are mainly electrolytic flue gas containing solid and gaseous fluorides. By utilizing the good adsorption properties of alumina for gaseous fluorides, the fluorides in the electrolytic flue gas can be adsorbed on alumina, which can ensure that the electrolytic flue gas meets the emission standards and reduce production costs by recycling the fluorides in the electrolytic flue gas.

[0003] For secondary removal of hydrogen fluoride (HF) from electrolytic flue gas, the feed purification process employed is a dry purification process. Fresh alumina (Al2O3) serves as an adsorbent to absorb the adsorbate hydrogen fluoride (HF) in the electrolytic flue gas. The adsorbed HF reacts chemically with the alumina (Al2O3) to form a surface compound—fluorine-loaded alumina (AlF3). The reaction formula is Al2O3 + 6HF → 2AlF3 + 3H2O. The resulting fluorine-loaded alumina is transported back to the electrolysis workshop via a pneumatic chute as an electrolysis feedstock. Furthermore, the hydrogen fluoride adsorbed in the fluorine-loaded alumina replenishes the fluorine element required in the electrolytic production process.

[0004] Defects of the existing technology:

[0005] During electrolytic production, a feed truck is required to periodically refill the fluoride salt tank above the electrolytic cell. However, the fluorine content of the fluorine-loaded alumina produced through feed purification cannot be precisely controlled, sometimes resulting in an excessively low fluorine content. This results in increased fluoride salt usage in the electrolytic cell. Once the fluoride salt in the tank is used up prematurely, manual refilling is necessary. This not only directly increases labor costs, but also causes the actual fluoride salt usage to exceed the plan, increasing labor and material costs.

[0006] When fresh alumina is used for reaction, the consumption of fresh alumina is large. When there is a shortage of fresh alumina, it is difficult to effectively control the hydrogen fluoride content in the flue gas. At the same time, the fluorine content of the fluorine-loaded alumina is greatly reduced, making it difficult to maintain the stability and safety of the system. Summary of the Invention

[0007] In response to the technical problems existing in the background technology, the present invention provides a fluorine-loaded alumina secondary reaction device and method.

[0008] To achieve the above objectives, the technical solution provided by the present invention is:

[0009] A fluorine-loaded alumina secondary reaction device comprises a reactor, an electrolytic cell, and a silo. One inlet of the reactor is connected to the fume exhaust pipe of the electrolytic cell, and the other inlet of the reactor is connected to the fresh alumina delivery pipe. A discharge pipe is provided at the bottom of the reactor, and the discharge pipe comprises two discharge branches, one of which is connected to the inlet of the reactor through a reflux pipe, and the other is delivered to the silo of the electrolysis workshop through an electrolysis raw material pipeline.

[0010] Optionally, a plurality of the reactors are arranged in parallel, and a plurality of smoke exhaust branch pipes are branched out from the end of the smoke exhaust pipe, and the smoke exhaust branch pipes are respectively connected to the reactors.

[0011] Optionally, the reactor includes a serpentine-arranged reaction tube, a material injector and a dust collector, the material injector is arranged inside the reaction tube, and at least one material injector is provided. The fresh alumina conveying pipe and the reflux pipe are connected to the feed port of the material injector.

[0012] Optionally, the reaction tube includes several descending tube sections, ascending tube sections and horizontal upper tube sections, a material injector is provided inside the upper end of each ascending tube section, and a material injector is provided inside the side of each horizontal upper tube section close to the ascending tube section.

[0013] Optionally, the material injector is configured as a conical cylinder with two ends, wherein a plurality of injection holes are opened on the circumference of the outer wall of the conical cylinder at one end that contacts the flue gas head-on, and a fixing component is fixed to the outer wall of the conical cylinder at the other end, and the fixing component is fixed on the reaction tube.

[0014] Optionally, the material injector includes a first conical cylinder and a second conical cylinder, a material cavity is provided inside the first conical cylinder, and a plurality of injection holes connected to the material cavity are uniformly distributed on the circumferential outer wall of the first conical cylinder.

[0015] Optionally, a mounting groove is provided in the middle of the second conical cylinder, and a first vertical surface, an inclined surface, a first arcuate surface and a second vertical surface are sequentially provided on the inner wall of the mounting groove close to the first conical cylinder; the fixing assembly includes a flange plate 1, a fixing plate and a hinge head connected as one piece, a fixing plate is provided at the bottom end of the flange plate 1, a hinge head is obliquely extended at the bottom end of the fixing plate, a hinge shaft is provided at the center of the first arcuate surface, and the hinge head is connected to the hinge shaft rotating shaft; the fixing plate is internally penetrated A through hole is provided, and both side walls of the fixing plate are provided with sliding grooves connected to the through hole. The upper part of the through hole is provided with an internal thread and is connected to a tightening screw. The bottom end of the tightening screw is rotatably provided with a pressure head, and pressure rods are symmetrically provided on both sides of the pressure head. The pressure rods are slidably provided in the sliding groove, and one end of the pressure rod extends from the sliding groove and presses the outer wall of the second conical cylinder; when the pressure rod presses the second conical cylinder downward, the first vertical surface is set close to the side wall of the fixing plate, and the inclined surface is set close to the side wall of the hinge head.

[0016] Optionally, a mounting hole is provided inside the tightening screw, a material tube is slidably provided in the mounting hole, and the bottom end of the material tube extends into the mounting groove and is connected to the material cavity.

[0017] Optionally, the outer wall of the reaction tube is provided with a flange 2, and the flange 1 and flange 2 are fixed by a bolt assembly.

[0018] A secondary reaction method of fluorine-loaded alumina comprises the following steps: the flue gas of an electrolytic cell enters a reactor through a flue gas exhaust pipe, fresh alumina used for flue gas purification and adsorption is connected to the reactor through a fresh alumina delivery pipe, the fresh alumina and flue gas are mixed in the reactor and an adsorption reaction begins; the fluorine-loaded alumina generated by the reaction in the reactor is divided into two paths through a discharge pipe, one path is connected to the inlet of the reactor through a reflux pipe to undergo a secondary adsorption reaction, and the other path is delivered to the silo of the electrolysis workshop through an electrolysis raw material pipeline for use as an electrolysis raw material.

[0019] The present invention has the following advantages and beneficial effects:

[0020] 1. Dual Adsorbent System: This system uses fresh alumina and fluorine-loaded alumina as adsorbents to participate in the adsorption reaction. This dual adsorbent system not only improves the reaction efficiency of the adsorption process, but also allows the fluorine-loaded alumina to continue the adsorption reaction even when fresh alumina is insufficient, thereby ensuring effective control of the hydrogen fluoride content in the flue gas. This is crucial for maintaining system stability and safety.

[0021] 2. Improve adsorption efficiency and stability: By using a combination of fresh alumina and fluorine-loaded alumina, the flow of fresh alumina and fluorine-loaded alumina in the dust collector is controlled, which improves the adsorption efficiency. Even when the amount of material is large, a good adsorption effect can be maintained, thereby improving the overall performance and processing capacity of the reactor system.

[0022] 3. Enhanced emergency response capabilities: In the case of a shortage of fresh alumina, the presence of fluorine-loaded alumina wins valuable processing time for the processing personnel, avoiding a sharp increase in the hydrogen fluoride content in the flue gas, thereby reducing possible safety risks and enhancing the reliability and safety of the system.

[0023] 4. Improved resource utilization efficiency: By recycling fluorine-loaded alumina, the consumption of fresh alumina is reduced and resource utilization efficiency is improved. At the same time, the recycling of fluorine-loaded alumina also increases the fluorine content in the fluorine-loaded alumina and reduces the content of hydrogen fluoride in the flue gas, which not only helps to reduce operating costs but also conforms to the concept of sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A system diagram of the fluorine-loaded alumina secondary reaction device provided by the present invention;

[0025] Figure 2 A system diagram of the reactor provided by the present invention;

[0026] Figure 3 A diagram showing a first installation structure of a reaction tube and a material injector provided by the present invention;

[0027] Figure 4 The structure of the material ejector and the fixing assembly provided by the present invention Figure 1 ;

[0028] Figure 5 The structure of the material ejector and the fixing assembly provided by the present invention Figure 2 ;

[0029] Figure 6 The structure of the material ejector and the fixing assembly provided by the present invention Figure 3 ;

[0030] Figure 7 A front view of the material ejector and the fixing assembly provided by the present invention;

[0031] Figure 8 for Figure 7 Left view of;

[0032] Figure 9 for Figure 8 Cross-sectional view along the AA direction;

[0033] Figure 10A structural diagram of the material ejector provided by the present invention;

[0034] Figure 11 A half-sectional view of the material ejector provided by the present invention;

[0035] Figure 12 A structural diagram of the fixing assembly provided by the present invention;

[0036] Figure 13 A half-section view of the fixing assembly provided by the present invention;

[0037] Figure 14 A structural diagram of the tightening screw provided by the present invention;

[0038] Figure 15 A second installation structure diagram of the reaction tube and the material injector provided by the present invention;

[0039] Icons: 1-Fresh alumina conveying pipeline, 2-Smoke exhaust pipeline, 21-Smoke flow monitoring module, 3-Reactor, 31-Smoke exhaust branch after purification, 33-Downward pipe section, 34-Ascending pipe section, 35-Horizontal upper pipe section, 351-Flange 2, 36-Dust collector, 4-Discharge pipe, 41-Return pipe, 42-Electrolysis raw material pipeline, 5-Mixer, 6-Electrolytic cell, 7-Material injector, 71-First cone, 711-Injection hole, 712-Material cavity, 713-Conical tank wall, 714-Feed connection hole, 72-Second cone shaped cylinder, 721-mounting groove, 722-first vertical surface, 723-inclined surface, 724-first arcuate surface, 725-second vertical surface, 726-second arcuate surface, 73-hinge shaft, 8-fixing component, 81-flange one, 811-through hole, 812-bolt hole, 82-fixing plate, 821-slide groove, 822-first fitting surface, 83-hinge head, 831-hinge hole, 832-second fitting surface, 9-tightening screw, 91-rotating part, 92-screw, 93-pressing head, 94-pressing rod, 95-mounting hole. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0042] Example 1

[0043] like Figures 1 to 3 As shown, a fluorine-loaded alumina secondary reaction device includes a reactor 3, an electrolytic cell 6, a silo 5, etc. One inlet of the reactor 3 is connected to the exhaust pipe 2 of the electrolytic cell 6, and the exhaust pipe 2 is connected to a flue gas flow monitoring module 21 for real-time monitoring of the flue gas flow to achieve uniform distribution of the flue gas. The other inlet of the reactor 3 is connected to the fresh alumina delivery pipe 1. A discharge pipe 4 is provided at the bottom of the reactor 3. The discharge pipe 4 includes two discharge branches, one of which is connected to the inlet of the reactor 3 through a reflux pipe 41, and the other is transported to the silo 5 of the electrolysis workshop through an electrolysis raw material pipe 42. The fluorine-loaded alumina in the silo 5 is used to be transported to the electrolytic cell 6 for use.

[0044] like Figure 1 As shown, several reactors 3 are arranged in parallel, and the present invention preferably sets three. Three exhaust branches are evenly divided into three exhaust branches at the end of the exhaust pipe 2, and the exhaust branches are respectively connected to the corresponding reactors 3. After the flue gas is evenly divided into multiple branches, they are respectively introduced into the corresponding reactors 3 for reaction.

[0045] like Figure 2 、 Figure 3 As shown, the reactor 3 includes a serpentine-arranged reaction tube, a material injector 7 and a dust collector 36. The material injector 7 is arranged inside the reaction tube. There is at least one material injector 7. The fresh alumina conveying pipeline 1 and the reflux pipeline 41 are connected to the feed port of the material injector 7.

[0046] Specifically, the reaction tube includes several downcomers 33, upcomers 34, and horizontal upper sections 35. A material injector 7 is located within the upper end of each upcomer 34, and a material injector 7 is located within each horizontal upper section 35 on the side adjacent to the upcomer 34. This design allows flue gas to bend and turn within the reaction tube, continuously rising and falling. By providing the material injectors 7 within the upper end of the upcomer 34 and within the side adjacent to the upcomer 34 of the horizontal upper section 35, the rising flue gas is fully exposed to the material ejected by the material injectors 7, thereby increasing the contact efficiency between the material and the flue gas. In the present invention, a material injector 7 is arranged inside the horizontal upper pipe section 35 on one side close to the ascending pipe section 34, and the material injector 7 of this section is connected to the alumina conveying pipe 1; a material injector 7 is arranged inside the upper end of the ascending pipe section 34, and the material injector 7 of this section is connected to the reflux pipe 41, so that two material injectors 7 are installed at the corner positions of the ascending pipe section 34 and the horizontal upper pipe section 35, and fresh alumina and fluorine-loaded alumina are respectively introduced. After coordination, the adsorption purification effect of the double adsorbent is achieved to remove hydrogen fluoride, which can not only reduce the consumption of fresh alumina, but also provide the content of fluorine-loaded alumina and reduce the content of hydrogen fluoride, thereby meeting the stability and safety of the system operation.

[0047] As a preferred embodiment of the present invention, the material injector 7 is configured to be in the shape of a conical cylinder at both ends, wherein a plurality of injection holes 711 are provided on the circumference of the outer wall of the conical cylinder at one end that is in direct contact with the flue gas. The material is ejected in the circumferential direction through the injection holes 711 and is evenly dispersed inside the reaction tube, making full and uniform contact with the flue gas to realize the reaction; a fixing component 8 is fixed on the outer wall of the conical cylinder at the other end, and the fixing component 8 is fixed on the reaction tube.

[0048] like Figure 3 As shown, in this embodiment, the material injector 7 and the fixed component 8 are fixedly connected, and the fixed component 8 is fixed on the inner wall of the reaction tube, and one end thereof extends to the outer wall of the reaction tube. The interior of the fixed component 8 is hollow and connected to the material injector 7, and the material (fresh alumina or fluorine-loaded alumina) can be transported to the interior of the material injector 7 and ejected out.

[0049] Example 2

[0050] Furthermore, in order to ensure the convenience of disassembly and assembly of the material ejector 7, the design is further optimized.

[0051] like Figures 4 to 15As shown, the material injector 7 includes a first conical cylinder 71 and a second conical cylinder 72. The conical design at both ends can guide the flue gas and material, reduce the resistance of the material and flue gas, reduce the contact resistance between the material and the material injector 7, avoid the material from being damaged or worn by impact, and achieve a uniform mixing reaction between the material and the flue gas; the length of the first conical cylinder 71 is greater than the length of the second conical cylinder 72, that is, the taper of the second conical cylinder 72 is smaller and more gentle, which can smoothly contact the flue gas and material and reduce the resistance. The second conical cylinder 72 is also conical in design, which also plays the role of smoothly contacting the flue gas and material and reducing the resistance. It is also used to install the fixing component 8. A material cavity 712 is provided inside the first conical cylinder 71, and a plurality of injection holes 711 connected to the material cavity 712 are evenly distributed on the circumferential outer wall of the first conical cylinder 71. The bottom wall of the material cavity 712 is provided with an annular conical groove wall 713, which can guide the material and facilitate the material to be ejected from the injection hole 711.

[0052] like Figures 4 to 15 As shown, a mounting groove 721 is provided in the middle of the second conical cylinder 72. The inner wall of the mounting groove 721, which faces the first conical cylinder 71, is sequentially provided with a first vertical surface 722, an inclined surface 723, a first curved surface 724, a second vertical surface 725, and a second curved surface 726. The fixing assembly 8 includes an integrally connected flange 81, a fixing plate 82, and a hinge joint 83. The bottom end of the flange 81 is provided with a fixing plate 82, which is provided with a plurality of bolt holes 812 around its circumference. The side of the fixing plate 82 that faces the first conical cylinder 71 is a first mating surface 822. The bottom end of the fixing plate 82 is provided with a hinge joint 83 that extends obliquely. The side of the hinge joint 83 that faces the first conical cylinder 71 is a second mating surface 832. The center of the first curved surface 724 is provided with a hinge shaft 73. A hinge hole 831 is provided within the hinge joint 83. The hinge joint 83 is rotatably connected to the hinge shaft 73 via the hinge hole 831. A through hole 811 is provided inside the fixing plate 82, and both side walls of the fixing plate 82 are provided with slide grooves 821 connected to the through hole 811. The upper part of the through hole 811 is provided with an internal thread and is connected to a tightening screw 9. The tightening screw 9 includes a rotating part 91, a screw 92, a pressure head 93, and a pressure rod 94. The upper end of the screw 92 is integrally connected to the rotating part 91, and the bottom end of the screw 92 is rotatably provided with a pressure head 93. The outer diameter of the pressure head 93 is equivalent to the outer diameter of the screw 92. Pressure rods 94 are symmetrically provided on both sides of the pressure head 93. The pressure rod 94 is slidably set in the slide groove 821, and one end of the pressure rod 94 extends out from the slide groove 821 and presses the outer wall of the second conical cylinder 72.

[0053] Furthermore, a mounting hole 95 is provided inside the tightening screw 9, and a feed connection hole 714 connected to the hopper 5 is provided on the inner wall of the mounting groove 721, that is, the second vertical surface 725. A material pipe is slidably provided in the mounting hole 95, and the bottom end of the material pipe extends into the mounting groove 721 and is connected to the feed connection hole 714.

[0054] like Figures 4 to 15 As shown, further, the outer wall of the reaction tube is provided with a flange 2 351, and flange 1 81 and flange 1 81 are fixed by a bolt assembly. This structural design allows the material injector 7 and the fixing assembly 8 to be adjusted at any angle when installing the material injector 7. The material injector 7 and the fixing assembly 8 can be quickly placed into the reaction tube through flange 2 351. After placement, the angle is adjusted again so that the material injector 7 and the fixing assembly 8 are perpendicular to each other. Then, flange 1 81 and flange 2 351 can be fixed. When disassembling, the opposite can be done. Obviously, such a design, by making structural improvements to the material injector 7, allows the ejected material to be evenly diffused and contacted with the flue gas to increase the reaction efficiency, while also achieving quick and convenient disassembly and assembly.

[0055] like Figure 4 As shown, when the fixing plate 82 is placed vertically downward, the material injector 7 has a tendency to move vertically downward by its own weight. At this time, the screw 92 is rotated to the upper end, and the pressure rod 94 is set against the outer wall of the second conical cylinder 72. In this state, it can be placed in the reaction tube for installation.

[0056] like Figures 5 to 15 As shown, when the pressure rod moves from Figure 4 When the second conical cylinder 72 is pressed downward in the state shown, the material ejector 7 rotates around the hinge shaft 73, and the first conical cylinder 71 rotates until it contacts the fixed plate 82, until the first vertical surface 722 contacts the first contact surface 822 of the fixed plate 82, and the inclined surface 723 contacts the second contact surface 832 of the hinge head 83. This is equivalent to the first conical cylinder 71 pressing the hinge head 83 to achieve fixation. Figure 9 As shown, after being fixed, the material ejector 7 is rotated to a horizontal state and is perpendicular to the fixing plate 82 .

[0057] In this invention, a material ejector (7) with tapered barrels at both ends is designed to address gas flow patterns. Alumina or fluorine-loaded alumina is ejected from the ejector, forming a uniform circular cross-section. This ensures a uniform mixing reaction between the alumina and flue gas, achieving the goal of adsorbing HF gas and purifying the electrolytic flue gas. As the ejected alumina / fluorine-loaded alumina rises with the flue gas, it directly or indirectly slides against the outer wall of the tapered barrel, reducing alumina breakage and resistance losses.

[0058] A secondary reaction method of fluorine-loaded alumina comprises the following steps: flue gas from an electrolytic cell 6 enters a reactor 3 via a flue gas exhaust pipe 2; fresh alumina for flue gas purification and adsorption is connected to the reactor 3 via a fresh alumina delivery pipe 1; the fresh alumina and flue gas are mixed in the reactor 3 and an adsorption reaction begins; the fluorine-loaded alumina generated by the reaction in the reactor 3 is divided into two paths via a discharge pipe 4; one path is connected to the inlet of the reactor 3 via a reflux pipe 41 to undergo a secondary adsorption reaction; and the other path is delivered to a silo 5 in the electrolysis workshop via an electrolysis raw material pipeline 42 for use as an electrolysis raw material.

[0059] This invention incorporates a dual-adsorbent system: fresh alumina and fluorine-loaded alumina are both adsorbents that participate in the adsorption reaction. This dual-adsorbent system not only improves the reaction efficiency of the adsorption process, but also allows the fluorine-loaded alumina to continue the adsorption reaction even when fresh alumina is insufficient, thereby effectively controlling the hydrogen fluoride content in the flue gas. This is crucial for maintaining system stability and safety.

[0060] The present invention can improve the adsorption efficiency and stability: by using a combination of fresh alumina and fluorine-loaded alumina, the flow rate of fresh alumina and fluorine-loaded alumina in the dust collector 36 is controlled, thereby improving the adsorption efficiency, so that even when the amount of material is large, a good adsorption effect can be maintained, thereby improving the overall performance and processing capacity of the reactor 3 system.

[0061] The device and method of the present invention have enhanced emergency handling capabilities: in the case of a shortage of fresh alumina, the presence of fluorine-loaded alumina wins valuable handling time for the treatment personnel, avoids a sharp increase in the hydrogen fluoride content in the flue gas, thereby reducing possible safety risks and enhancing the reliability and safety of the system.

[0062] The device and method of the present invention improve resource utilization efficiency: by recycling the fluorine-loaded alumina, the consumption of fresh alumina is reduced, and the resource utilization efficiency is improved. At the same time, the recycling of the fluorine-loaded alumina also increases the fluorine content in the fluorine-loaded alumina, meets the use of fluorine salts in electrolysis, and reduces the content of hydrogen fluoride in the flue gas, which not only helps to reduce operating costs but also conforms to the concept of sustainable development.

[0063] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A fluorine-loaded alumina secondary reaction device, characterized in that : Including reactor, electrolyzer, silo, One inlet of the reactor is connected to the exhaust pipe of the electrolytic cell, and the other inlet of the reactor is connected to the fresh alumina delivery pipe; A discharge pipe is provided at the bottom of the reactor, and the discharge pipe includes two discharge branches, one of which is connected to the inlet of the reactor through a reflux pipe, and the other is transported to the silo of the electrolysis workshop through the electrolysis raw material pipeline; The reactor comprises a serpentine-arranged reaction tube, a material injector and a dust collector, wherein the material injector is arranged inside the reaction tube, and at least one material injector is provided, and the fresh alumina delivery pipe and the reflux pipe are connected to the feed port of the material injector; The material injector is configured as a conical cylinder with two ends, wherein a plurality of injection holes are opened on the circumference of the outer wall of the conical cylinder at one end that contacts the flue gas head-on, and a fixing component is fixed to the outer wall of the conical cylinder at the other end, and the fixing component is fixed to the reaction tube; The material ejector comprises a first conical cylinder and a second conical cylinder, wherein a material cavity is provided inside the first conical cylinder, and a plurality of ejection holes connected to the material cavity are uniformly distributed on the circumferential outer wall of the first conical cylinder; The cam is secured to the bottom of the second support bracket, and the cam has a first end fixed to the side panel that is located adjacent to the first support bracket, and a second end of the cam is secured to the bottom of the second support bracket.

2. The fluorine-loaded alumina secondary reaction device according to claim 1, characterized in that: A plurality of reactors are arranged in parallel, and a plurality of exhaust branch pipes are branched out from the end of the exhaust pipe, and the exhaust branch pipes are respectively connected to the reactors.

3. The fluorine-loaded alumina secondary reaction device according to claim 1, characterized in that: The reaction tube includes several descending tube sections, ascending tube sections and horizontal upper tube sections. A material ejector is provided inside the upper end of each ascending tube section, and a material ejector is provided inside the side of each horizontal upper tube section close to the ascending tube section.

4. The fluorine-loaded alumina secondary reaction device according to claim 1, characterized in that: A mounting hole is provided inside the tightening screw rod, a material pipe is slidably provided in the mounting hole, and the bottom end of the material pipe extends into the mounting groove and is communicated with the material cavity.

5. The fluorine-loaded alumina secondary reaction device according to claim 1, characterized in that: The outer wall of the reaction tube is provided with a flange 2, and the flange 1 and flange 2 are fixed by a bolt assembly.

6. A reaction method using the fluorine-loaded alumina secondary reaction device according to any one of claims 1 to 5, comprising the following steps: The flue gas from the electrolytic cell enters the reactor through the exhaust pipe. The fresh alumina used for flue gas purification and adsorption is connected to the reactor through the fresh alumina delivery pipe. The fresh alumina and flue gas are mixed in the reactor and the adsorption reaction begins. The fluorine-loaded alumina generated by the reaction in the reactor is divided into two paths through the discharge pipe. One path is connected to the inlet of the reactor through the reflux pipe for secondary adsorption reaction; the other path is transported to the silo of the electrolysis workshop through the electrolysis raw material pipeline for use as electrolysis raw material.

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