A flue gas purification and recovery system and a flue gas purification method of a molten salt electrolytic furnace

Abstract

The present application relates to a kind of flue gas purification recovery system and flue gas purification recovery method of fused salt electrolytic furnace.The electrolytic furnace including electrolytic cell, electrolytic furnace includes anode conductive component with cover plate, and multiple components are arranged on the cover plate;The cover plate is hollow structure, and the hollow part is set as cooling chamber, cooling chamber is used to cool anode conductive component;Suction hood component, be arranged in the upper portion of electrolytic cell, and the suction port formed by cover is covered with the opening of electrolytic cell, and the flue gas generated in the electrolysis process of electrolytic cell is sucked;Dust removal recovery device, including cyclone dust collector and cloth bag dust collector, cyclone dust collector and the cloth bag dust collector sequentially filter and recycle absorbed flue gas.The beneficial effects of the present application are that: by using two kinds of ways of reducing metal mixing in early stage and dust removal recovery of metal mixed in flue gas in later stage synergistic effect, while improving the yield of rare earth, metal element is recycled, and the recovery efficiency of metal element is improved.

Description

Technical Field

[0001] This invention relates to the field of rare earth electrolysis, and in particular to a flue gas purification and recovery system and a flue gas purification method for a molten salt electrolysis furnace. Background Technology

[0002] Rare earth elements possess many unique physicochemical properties and are widely used in various high-tech fields such as permanent magnets, catalysis, and special materials. Molten salt electrolysis for producing rare earth metals has advantages such as low cost and high yield, making it the mainstream process for actual rare earth production. However, the waste residue generated by this process contains a significant amount of rare earth elements. Due to the increasing demand for rare earth materials in magnetic materials in my country, the production of materials such as neodymium iron boron is also rising annually, resulting in a substantial increase in the amount of molten salt electrolysis slag. Considering the current tight supply of rare earth resources and their persistently strong prices, the recovery of rare earth elements from rare earth solid waste has received increasing attention in recent years. Rare earth elements in rare earth molten salt electrolysis slag generally exist in the form of rare earth fluorides and rare earth oxyfluorides, with a rare earth content ranging from approximately 20% to 80%. There are also some other complex non-rare earth impurities (silicon dioxide, iron oxide, etc.), but these components are generally stable substances and cannot be separated from the rare earth elements by simple acid leaching and filtration methods. Therefore, researchers have tried various strategies to address the problem that rare earth fluorides are insoluble in acid, making it difficult to dissolve rare earths in the liquid phase.

[0003] Chinese utility model patent CN222700432U discloses a flue gas recovery device for an electrolytic cell, relating to the field of flue gas recovery. The device includes a flue gas conveying pipe with a recovery component at its front end. The recovery component includes a recovery box, with its rear air inlet connected to the flue gas conveying pipe. Inside the recovery box, three filter cloth fixing plates are movably installed via several return springs. The recovery component facilitates the blocking of recyclable impurities and dust, allowing impurities adsorbed on the filter cloth to fall off. Flue gas that does not meet emission standards can be re-conveyed into the recovery box. This solves the problem of traditional electrolytic cell flue gas recovery devices using filter cloths, which require cleaning and disassembly after prolonged filtration, a cumbersome process that makes it difficult to ensure the degree of flue gas purification and leads to the direct discharge of substandard flue gas, easily causing environmental pollution.

[0004] However, the above-mentioned recycling device has a complex structure, limited recycling efficiency, and cannot reduce the mixing of iron elements during the electrolysis process, that is, it cannot reduce the consumption of iron blocks. Summary of the Invention

[0005] In order to solve the above-mentioned problems in the prior art, the present invention provides a flue gas purification and recovery system and a flue gas purification method for a molten salt electrolysis furnace.

[0006] The above-mentioned problems of the present invention are solved by the following technical solutions:

[0007] A flue gas purification and recovery system for a molten salt electrolysis furnace includes,

[0008] An electrolytic furnace with an electrolytic cell, the electrolytic furnace including a furnace cover plate and a plurality of anode conductive components disposed on the furnace cover plate; the furnace cover plate is a hollow structure, the hollow part is configured as a cooling chamber, and the upper end face of the furnace cover plate is provided with an air outlet communicating with the cooling chamber;

[0009] The cooling chamber is used to cool the anode conductive components;

[0010] The suction hood assembly includes at least two covers that can be opened and closed relative to each other. The suction hood assembly is located above the electrolytic cell, and the suction port formed by closing the covers can cover the opening of the electrolytic cell to suck up the flue gas generated by the electrolytic cell during the electrolysis process.

[0011] The dust collection and recovery device includes a cyclone dust collector and a bag dust collector connected by a suction pipe, wherein the cyclone dust collector and the bag dust collector sequentially filter and recover the absorbed flue gas.

[0012] A further provision of the above technical solution is that the anode conductive component includes an iron mounting base and a copper contact plate, and the mounting base is provided with a cooling channel; the mounting base and the contact plate are stacked and fixed on the furnace cover plate in sequence, and are fixed by the same fixing component.

[0013] A further provision of the above technical solution is that the furnace cover plate also includes a cover plate seat located below the power connection panel, and the cooling chamber is located between the cover plate seat and the furnace cover plate;

[0014] The cooling chamber is equipped with a liquid guide pipe, which connects to an external water supply device and the cooling chamber.

[0015] A further provision of the above technical solution is as follows: a wind baffle is provided on the furnace cover plate. The wind baffle is a shell structure with an opening at the lower end. A wind baffle groove extending to the opening is provided inside the shell. The wind baffle groove is connected above the air outlet. The wind baffle groove is used to store the high-temperature steam formed by the cooling liquid being heated, so that the cooling liquid is separated from it.

[0016] By adopting the above technical solution, when the coolant absorbs the heat of the electrical contact panel, the liquid at the top absorbs a large amount of heat and forms high-temperature steam. The high-temperature steam is output through the vent. At this time, due to the continuous external water supply, the surface of the coolant can still contact the electrical contact panel, thereby continuously cooling the electrical contact panel and ensuring the cooling effect.

[0017] A further provision of the above technical solution is that the suction hood assembly also includes a swing arm connecting the cover and the base body. The swing arm is hinged to the base body via a pivot and is driven by a cylinder to drive the cover.

[0018] By adopting the above technical solution, the two relatively openable covers of the suction hood assembly can completely cover the opening of the electrolytic cell when closed, ensuring that the flue gas generated during the electrolysis process is fully sucked up, avoiding leakage, and providing sufficient raw materials for subsequent metal recycling.

[0019] A further provision of the above technical solution is that the swing arm and the cylinder are connected by a transmission assembly, the transmission assembly including a rack and a gear, the gear being coaxially fixed to the rotating shaft, the end of the rack being fixedly connected to the end of the piston rod of the cylinder, and the rack meshing with the gear.

[0020] A further provision of the above technical solution is that a guide structure is provided between the rack and the base body, and the rack slides linearly along the tangential direction of the gear through the guide structure.

[0021] A further configuration of the above technical solution is as follows: the cyclone dust collector is connected to the outlet end of the suction pipe, and the top is used for air outlet; the bag filter box is connected to the output end of the cyclone dust collector;

[0022] The cyclone dust collector and the bag filter dust collector sequentially remove dust and recover dust from the flue gas.

[0023] By adopting the above technical solution, two dust removal processes are set up. After the cyclone dust collector filters out large particles of flue gas, small particles of flue gas are still mixed in the airflow. After passing through the bag filter dust box, the small particles of flue gas are also filtered out and the flue gas is collected, thereby improving the dust removal efficiency. In addition, most of the rare earth elements and metal elements mixed in the flue gas can be recycled and reused, reducing waste.

[0024] A further setting of the above technical solution is that the suction pipe is made of PP or PE material.

[0025] By adopting the above technical solution, when the flue gas is transported along the suction pipe, since the suction pipe is made of PP material, a non-metallic material, no metal impurities, especially iron elements, will be mixed into the flue gas. This ensures that the metal element content of the flue gas is low, making it easier for the subsequent dust removal and recovery device to recover metal elements, especially iron elements.

[0026] A further provision of the above technical solution is that an electrostatic precipitator is connected to the output end of the bag filter.

[0027] This invention also discloses a flue gas purification method, applied to the flue gas purification and recovery system of the molten salt electrolysis furnace described above, comprising the following steps:

[0028] S1. During the electrolysis process, coolant is injected into the cooling channel of the mounting base and the coolant circulates throughout all mounting bases; at the same time, a cooling chamber is set in the furnace cover plate, through which coolant is introduced, and the high-temperature steam generated by the coolant is separated, so that the coolant can continuously contact the electrical contact panel of the furnace cover plate, thereby cooling the anode conductive components installed on the electrical contact panel and reducing the consumption of iron.

[0029] S2. The flue gas generated after electrolysis is drawn in and collected through the suction hood assembly;

[0030] S3. The flue gas is transported to the dust collection and recovery device through a PP material suction pipe;

[0031] S4. The flue gas undergoes cyclone dust removal and bag dust removal in sequence in the dust removal and recovery device. The metal is separated and recovered by cyclone dust removal in the cyclone dust collector, and the remaining small metal particles are recovered and separated again in the bag dust collector box, thereby recovering the metal in the flue gas.

[0032] S5. The flue gas after being removed by the dust collection and recovery device enters the electrostatic precipitator through the suction pipe for electrostatic dust removal.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] 1. By adopting two methods—reducing metal contamination in the early stage and removing dust and recovering metals mixed in the flue gas in the later stage—the recovery efficiency of metal elements is improved by combining the two methods of increasing rare earth recovery rate and recovering metal elements.

[0035] 2. By designing a hollow cooling chamber in the furnace cover, the anode conductive components are cooled down, reducing their consumption during the electrolysis process, thereby reducing the mixing of metal impurities in the electrolytic cell and improving the rare earth yield.

[0036] 3. The dust collection and recovery device adopts a combination of "cyclone dust collector + bag dust collector". The cyclone dust collector first filters large particles of flue gas, and the bag dust collector then filters small particles. The two-stage treatment significantly improves dust collection efficiency and can recover most of the rare earth and metal elements in the flue gas, reducing resource waste.

[0037] 4. The suction pipe is made of PP or PE material (non-metallic) to prevent metal impurities from being mixed into the flue gas during transportation, ensuring the purity of metals in the flue gas and facilitating efficient recovery later. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0039] Figure 2 This is an exploded structural diagram of the furnace cover plate and the anode conductive components.

[0040] Figure 3 This is a schematic diagram of the exploded structure of the furnace cover plate.

[0041] Figure 4 This is a schematic diagram of the installation structure of the anode conductive component on the furnace cover plate.

[0042] Figure 5 This is a schematic diagram of the structure of the anode conductive component.

[0043] Figure 6 This is a schematic diagram showing the location of the air vent on the electrical panel.

[0044] Figure 7 This is a schematic diagram of the cross-sectional structure of the furnace cover plate.

[0045] Figure 8 for Figure 7 Enlarged structural diagram of part A in the middle.

[0046] Figure 9 This is an isometric sectional view of the wind deflector.

[0047] Figure 10 This is a schematic diagram of the suction hood assembly.

[0048] Figure 11 This is a schematic diagram of the transmission assembly.

[0049] Figure 12 This is a schematic diagram of the dust collection and recovery device.

[0050] Figure 13 This is a schematic diagram of a cyclone dust collector.

[0051] Figure 14 This is an isometric sectional view of a cyclone dust collector.

[0052] Figure 15 This is a schematic diagram of the cross-sectional structure of a cyclone dust collector.

[0053] Figure 16 This is a schematic diagram of another form of cyclone dust collector.

[0054] Figure 17 This is a schematic diagram of the cooling channel inside the mounting bracket.

[0055] The attached diagram is labeled as follows: 100, Cyclone dust collector; 110, Cyclone tube; 111, Cyclone section; 111.1, Air inlet; 111.2, Input port; 112, Collection section; 120, Fan; 200, Bag filter box; 300, Air duct adapter; 400, Air box; 1, Suction pipe; 2, Air outlet pipe; 3, Air duct; 4, Anode plate; 5, Liquid guide pipe; 5.1, Liquid outlet pipe; 5.2, Liquid inlet pipe; 6, Support pin; a, Electrode port; b, Air vent; 500, Furnace cover plate; 501, Insertion hole; 502, Mounting hole; 510, Electrical connection panel; 511, Positioning groove; 520, Cover plate seat; 503, Cooling chamber; 521, Support rib; 504, Air outlet. ; 505, conduit groove; 600, anode conductive component; 610, mounting base; 613, cooling channel; 611, electrode mounting part; 612, extension part; 620, junction plate; 630, fixing component; 700, wind baffle block; 701, wind baffle groove; 710, wind baffle cover; 702, air inlet; 720, limiting platform; 800, suction hood assembly; 810, cover; 820, swing arm; 830, base body; 840, cylinder; 850, gear; 860, rack; 870, rotating shaft; 880, guide wheel; 890, mounting bracket; a, electrode port; b, air leakage port; 50, electrolytic furnace; 10, dust collection and recovery device; c, opening; d, connection port. Detailed Implementation

[0056] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0057] like Figure 1-17 As shown in the following embodiments, a metal recovery system and recovery method for an electrolytic furnace are disclosed.

[0058] A flue gas purification and recovery system for a molten salt electrolysis furnace includes,

[0059] Specific reference Figure 1 As shown, an electrolytic furnace 50 with an electrolytic cell is provided. The electrolytic furnace 50 includes a furnace cover plate 500 and a plurality of anode conductive components 600 disposed on the furnace cover plate 500. The furnace cover plate 500 has a hollow structure, and the hollow part is configured as a cooling chamber 503. The upper end face of the furnace cover plate 500 is provided with a gas outlet 504 that communicates with the cooling chamber 503.

[0060] The cooling chamber 503 is used to cool the anode conductive component 600;

[0061] The suction hood assembly 800 includes at least two covers 810 that can be opened and closed relative to each other. The suction hood assembly 800 is located above the electrolytic cell, and the suction port formed by closing the covers 810 can cover the opening of the electrolytic cell to suck up the flue gas generated by the electrolytic cell during the electrolysis process.

[0062] The dust collection and recovery device 10 includes a cyclone dust collector 100 and a bag dust collector connected by a suction pipe 1. The cyclone dust collector 100 and the bag dust collector sequentially filter and recover the absorbed flue gas.

[0063] The above is the basic scheme of this embodiment.

[0064] like Figure 2 and Figure 3 As shown, the furnace cover plate 500 is used to be installed on the rare earth electrolysis furnace 50, and an insertion hole 501 is provided in the center of it;

[0065] Multiple anode conductive components 600 are used to mount the anode plate 4. The anode conductive components 600 are arranged in a circular pattern around the outer ring of the insertion hole 501 and extend above the insertion hole 501.

[0066] The furnace cover plate 500 has a hollow structure, and the hollow part is set as a cooling cavity 503. The cooling cavity 503 surrounds the insertion hole 501 and is used to cool the furnace cover plate 500. The upper end surface of the furnace cover plate 500 is provided with an air outlet 504 that communicates with the cooling cavity 503.

[0067] The upper surface of the furnace cover plate 500 is set as an electrical contact panel 510. The coolant in the cooling chamber 503 directly contacts the electrical contact panel 510, absorbing the heat on the electrical contact panel 510 and cooling it down.

[0068] The anode conductive component 600 is installed on the furnace cover plate 500 and transfers heat to the cooling chamber 503 through the furnace cover plate 500 to cool it down. During the electrolysis process, timely cooling of the anode conductive component 600 can minimize its consumption during the electrolysis process, thereby reducing the mixing of metal impurities in the electrolytic cell and improving the rare earth recovery rate during the electrolysis process.

[0069] The suction hood assembly 800 adsorbs the flue gas generated during electrolysis in the electrolytic cell. Furthermore, the suction port formed by the two covers 810 when they are closed faces the electrolytic cell and can cover the opening of the electrolytic cell, thereby enabling complete suction of the flue gas generated during electrolysis in the electrolytic cell, which facilitates the subsequent recovery of metals, especially iron, from the flue gas.

[0070] In this embodiment, the inlet end of the suction pipe 1 is located above the electrolytic cell of the electrolytic furnace 50. The pipe at the inlet end is vertically positioned on the electrolytic cell. To ensure the absorption effect, a gas collection hood can be connected to the inlet end to completely cover the opening of the electrolytic cell and vertically suck in the flue gas generated inside the electrolytic cell. The cyclone dust collector 100 and the bag dust collector are connected by other suction pipes 1 to transport the flue gas.

[0071] Cyclone dust collector 100 is a type of dust removal device. The dust removal mechanism is to make the dust-laden airflow rotate, and use centrifugal force to separate the dust particles from the airflow and collect them on the wall of the device, and then use gravity to make the dust particles fall into the ash hopper.

[0072] The cyclone dust collector 100 works by the airflow containing dust entering the dust collector through the tangential inlet. The airflow rotates inside the dust collector, and the dust particles in the airflow move towards the outer wall under the action of centrifugal force. They reach the wall surface and fall into the ash hopper under the action of airflow and gravity, thus achieving the purpose of separation.

[0073] Most of the rotating airflow moves spirally from top to bottom towards the bottom of the cone along the wall of the container, forming a descending external swirling dust-laden airflow. The centrifugal force generated during the intense rotation throws dust particles, which are much denser than gas, toward the container wall. Once the dust particles come into contact with the container wall, they lose their inertial force and fall along the wall into the dust collection hopper by the momentum of their inlet velocity and their own gravity.

[0074] In this embodiment, the flue gas mixed with metal is drawn into the cyclone dust collector 100 through the suction pipe 1, and a rotating airflow is formed in the cyclone dust collector 100. The flue gas in the airflow moves towards the outer wall under the action of centrifugal force and separates from the airflow.

[0075] The flue gas, after being recovered once in the cyclone dust collector 100, enters the bag filter dust collector along the suction pipe 1. The bag filter dust collector is a dry dust collection device suitable for collecting fine, dry, non-fibrous dust. The filter bags are made of woven filter cloth or non-woven felt, utilizing the filtration effect of the fibrous fabric to filter the dust-laden gas. When the dust-laden gas enters the bag filter dust collector, large and heavy dust particles settle down due to gravity and fall into the ash hopper. When the gas containing finer dust passes through the filter media, the dust is trapped, thus purifying the gas.

[0076] After the cyclone dust collector 100 filters out large particles of flue gas, small particles of flue gas are still mixed in the airflow. After passing through the bag filter dust box 200, the small particles of flue gas are also filtered out and the flue gas is collected to improve dust removal efficiency. It can also recycle most of the rare earth elements and metal elements mixed in the flue gas, reducing waste.

[0077] Specifically, the anode conductive component 600 includes an iron mounting base 610 and a copper contact plate 620. The mounting base 610 is provided with a cooling channel 613. The mounting base 610 and the contact plate 620 are stacked and fixed on the furnace cover plate 500 in sequence and are fixed by the same fixing component 630.

[0078] Reference Figure 4 and Figure 5 As shown, the anode conductive component 600 is disposed on the upper end surface of the furnace cover plate 500, and one end of it extends toward the center of the furnace cover plate 500 and into the position of the insertion hole 501 for mounting the anode plate 4. The anode plate 4 extends downward through the insertion hole 501 into the rare earth electrolysis furnace 50.

[0079] Furthermore, in order to more effectively cool the mounting base 611 and reduce the consumption of iron during the electrolysis process, in this embodiment, a cooling channel 613 is provided inside the iron mounting base 611 body, as detailed in the following reference. Figure 4 , Figure 5 and Figure 17 As shown, an opening c is provided at the outward-facing end of the mounting base 611. This opening c connects to the cooling channel 613 inside the mounting base 610 for inputting or outputting coolant. Furthermore, in this embodiment, to connect the cooling channels 613 of multiple mounting bases 611, adjacent anode conductive components 600 are configured as electrode mounting portions 611 at the head of the mounting base 610. The front end of the electrode mounting portion 611 is a concave arc surface, and the concave arc surface and the rear extension 612 are connected by a bevel. The front ends of the multiple electrode mounting portions 611... The arc-shaped concave surfaces can be spliced ​​to form a complete circular structure, thereby allowing the anode plates 4 to be spliced ​​to form a circular groove; the inclined surfaces of two adjacent electrode mounting parts 611 can be spliced ​​or infinitely close. In this embodiment, a connecting port d is provided on the inclined surface of the electrode mounting part 611, and adjacent connecting ports d are connected by pipe fittings, thereby connecting the cooling channels 613 in all mounting seats 610. Coolant can be input and output through the opening of one of the mounting seats 610, thus supplying coolant to all mounting seats 610 on the entire furnace cover plate 500.

[0080] Based on the above settings, in this embodiment, by introducing coolant into the iron mounting base 610 to lower its temperature, the consumption of iron elements during the electrolysis process is greatly suppressed, the amount of iron elements entering the electrolyte is reduced, the rare earth recovery rate of the electrolyte is improved, and the service life of the mounting base 610 is extended.

[0081] During electrolysis, because the mounting base 610 is a conductor, the dissolution and consumption of iron will increase to some extent. The higher the temperature, the faster the electrochemical corrosion reaction rate of iron, thus increasing material consumption. Based on actual use, the setup of this embodiment, compared with the previous device, suppresses iron consumption by more than 90%, and by reducing the electrolytic slag formed by iron in the electrolyte, it greatly alleviates the adhesion between the large and small molybdenum pots in the electrolytic furnace.

[0082] In order to install the anode conductive component 600, in this embodiment, the furnace cover is provided with a positioning part corresponding to the anode conductive component 600, which is used to position and fix the anode conductive component 600.

[0083] Preferably, the positioning part is provided with at least one mounting hole 502, which can fasten the anode conductive component 600 to the furnace cover plate 500.

[0084] A positioning part is set on the furnace cover plate 500 to position the anode conductive component 600, and an installation hole 502 is set on the positioning part to fix the anode conductive component 600. In other words, the furnace cover plate 500 only needs to be set with positioning parts and installation holes 502 corresponding to the number of anode conductive components 600, which greatly simplifies the production process and technology of the furnace cover plate 500 and saves the production cost of the furnace cover plate 500.

[0085] The mounting base 610 and the electrical connector 620 are stacked and fixed by the same fixing component 630, which saves the number of fixing components 630 used. At the same time, only one component of the mounting base 610 or the electrical connector 620 needs to be positioned to position the whole, so as to meet the need to reduce the positioning structure on the furnace cover plate 500.

[0086] In order to connect the anode plate 4 to electricity while reducing energy consumption, in this embodiment, the mounting base 610 is an iron conductive plate, and the connecting plate 620 is made of copper to ensure good conductivity of the anode conductive component 600.

[0087] The positioning part is a positioning groove 511 provided on the power receiving panel 510 for installing the anode conductive component 600; the positioning groove 511 is provided with a mounting hole 502.

[0088] Preferably, in this embodiment, the positioning groove 511 is used to position the electrode plate 620, and the mounting base 610 is stacked on top of the electrode plate 620 and fixed into the mounting hole 502 by the same fixing component 630. The positioning groove 511 only needs to position the electrode plate 620, without the need to set an additional positioning structure to position the mounting base 610.

[0089] Meanwhile, the positioning groove 511 reduces the thickness of the power receiving panel 510, thereby allowing the anode conductive component 600 to be closer to the cooling chamber 503 and accelerating heat transfer.

[0090] Meanwhile, the mounting hole 502 is located near the insertion hole 501. The inner side of the assembled furnace cover plate 500 needs to support the anode plate 4 and other structures, so a large supporting force is required. The mounting hole 502 is reasonably positioned and can provide good support for the middle part of the furnace cover plate 500.

[0091] Multiple anode plates 4 are inserted into the insertion hole 501 and spliced ​​together to form an annular electrolytic cell. Therefore, the mounting base 610 needs to be arranged in an annular shape. Preferably, the positioning groove 511 is arranged radially around the insertion hole 501 and its outer end extends to the outer end of the conductive panel.

[0092] Specific references Figure 6 As shown, a baffle block 700 is provided on the furnace cover plate 500. The baffle block 700 is a shell structure with an opening at the lower end. A baffle groove 701 extending to the opening is provided inside. The baffle groove 701 is connected above the air outlet 504. The baffle groove 701 is used to store the high-temperature steam formed by the cooling liquid when heated, so that the cooling liquid is separated from it.

[0093] To prevent high-temperature steam from being output outside the furnace cover plate 500, a baffle block 700 is provided in this embodiment to stop it, so that the high-temperature steam is retained inside the baffle plate. In addition, the high-temperature steam above the outlet 504 can come into contact with the coolant below, and the coolant cools down part of the high-temperature steam, so that part of the high-temperature steam can mix into the coolant.

[0094] Preferably, in this embodiment, the coolant can be water or other liquids with good heat absorption properties.

[0095] To prevent high-temperature steam from entering the air at a level higher than the coolant level, in this embodiment, the wind deflector 700 is a shell structure with an open lower end. An internal wind deflector groove 701 extends to the opening. The wind deflector groove 701 connects above the air outlet 504. See [specific reference] for details. Figure 7 and Figure 8 As shown,

[0096] Based on the above configuration, the position of the wind baffle 701 is higher than the height of the coolant. When the high-temperature steam rises, it gathers into the wind baffle 701, leaving space for the coolant so that the external coolant can be replenished, thus satisfying the need for the coolant to continuously cool the furnace cover plate 500.

[0097] Additionally, refer to Figure 9As shown, in order to meet the positional requirements of the wind deflector 701, the wind deflector block 700 is provided with a wind deflector cover 710, the wind deflector cover 710 being positioned higher than the end face of the wind deflector block 700; the wind deflector 701 is located below the wind deflector cover 710;

[0098] The lower end face of the windbreak block 700 is provided with an air inlet 702 that connects the windbreak groove 701 and the air outlet 504.

[0099] In this embodiment, the wind deflector 710 protrudes from the upper end surface of the wind deflector groove 701 so that the position of the wind deflector groove 701 formed below the wind deflector 710 can be higher than the air outlet 504, and can have as much space as possible to collect high-temperature steam.

[0100] Preferably, in this embodiment, the windshield cover 710 can be integrally formed with the windshield block 700, or it can be manufactured separately and then sealed and installed onto the windshield block 700.

[0101] Preferably, in this embodiment, a limiting platform 720 is provided at the bottom of the wind deflector 700. The limiting platform 720 blocks part of the opening on the lower end face of the wind deflector 700, so that the horizontal cross-sectional area of ​​the air inlet 702 is smaller than the horizontal cross-sectional area of ​​the wind deflector groove 701.

[0102] The purpose of setting the limiting platform 720 is to reduce the area of ​​the air inlet 702, so that after the high-temperature steam enters the air inlet slot from the air inlet 702, it cannot overflow from the area of ​​the limiting platform 720, but can only overflow from the air inlet 702. Since high-temperature steam is constantly entering the air inlet 702, it counteracts the overflowing high-temperature steam, thereby reducing the escape of high-temperature steam.

[0103] Specifically, the furnace cover plate 500 also includes a cover plate seat 520 located below the power receiving panel 510, and the cooling chamber 503 is located between the cover plate seat 520 and the furnace cover plate 500.

[0104] The cooling chamber 503 is provided with a liquid guide pipe 5, which connects the external water supply device and the cooling chamber 503.

[0105] The liquid guide pipe 5 is provided with an inlet pipe 5.2 and an outlet pipe 5.1. The outlet pipe 5.1 extends into the windbreak groove 701 through the air outlet 504. (Refer to...) Figure 3 As shown.

[0106] In this embodiment, external coolant enters the cooling chamber 503 through the liquid guide pipe 5 and flows into the wind deflector 701 from the outlet of the liquid outlet pipe 5.1. That is, the coolant preferentially enters the wind deflector 701, and part of it is rapidly vaporized to form high-temperature steam that remains in the wind deflector 701. The unvaporized part remains liquid and is output from the air outlet 504 below the wind deflector 701, entering the cooling chamber 503 to fill it.

[0107] This design allows the wind deflector 701 to be quickly filled with high-temperature steam, preventing liquid coolant from entering the wind deflector 701 and crowding out the space for high-temperature steam. This allows the high-temperature steam to overflow into the cooling chamber 503 and crowd out the space for coolant.

[0108] In order to limit the position of the liquid guide pipe 5 and prevent it from moving during operation, which would prevent high-temperature steam from entering the wind deflector 701, in this embodiment, the side wall of the air inlet 702 is provided with a guide groove 505, which is used to limit and guide the output direction of the liquid outlet pipe 5.1.

[0109] The duct groove 505 is an inclined notch recessed in the side wall. The outlet pipe 5.1 is inserted into the notch and arranged along the inclined direction of the notch, so that the coolant output direction is inclined upward. (Refer to...) Figure 8 As shown.

[0110] In this embodiment, the cover plate seat 520 is provided with a cavity wall for surrounding and forming an annular groove. The cavity wall is sealed and installed on the lower end face of the power receiving panel 510 so that the cross-sectional panel seals the upper port of the annular groove to form a cooling cavity 503. The cooling cavity 503 is arranged in an annular shape around the insertion hole 501.

[0111] During the electrolysis process in the electrolytic furnace 50, the heat inside the electrolytic cell is the highest, and the heat gradually decreases outward in a radial pattern. In this embodiment, the cooling chamber 503 is set as a ring structure to adapt to the temperature distribution of the electrolytic furnace 50, which can maximize the cooling of the electrical panel 510.

[0112] Furthermore, in this embodiment, the cavity wall not only seals the cooling cavity 503, but also provides support for the electrical panel 510, ensuring the stability of the electrical panel 510 under stress.

[0113] Reference Figure 3As shown, the power receiving panel 510 is configured as an approximately square structure, while the cooling cavity 503 is an annular structure. To ensure stable support for the power receiving panel 510, in this embodiment, a support frame extends outward from the outer wall of the cooling cavity 503. The outermost end of the support frame is fixed to the four corners of the power receiving panel 510 by support pins 6. Furthermore, the support frame includes support ribs 521 that connect two adjacent support pins 6 and connect the support pins 6 and the cavity wall. The upper end of the support ribs 521 abuts against the power receiving panel 510, forming support for the power receiving panel 510, thereby ensuring uniform support of the entire cover plate seat 520 for the power receiving panel 510 and enhancing the structural strength of the furnace panel.

[0114] In addition, in this embodiment, the anode conductive component 600 is installed radially on the furnace cover plate 500, and a gap is formed between two adjacent anode conductive components 600. The gas outlet 504 is located at the gap, and the gap is filled by the wind baffle block 700 to cover the gas outlet 504.

[0115] When the end of the anode conductive component 600 extends above the insertion hole 501, it blocks the edge above the insertion hole 501. The ends of multiple anode conductive components 600 are spliced ​​together to form an electrolytic hole with an inner diameter smaller than the insertion hole 501. A notch is formed between two adjacent extensions 612. Furthermore, because the inner diameter of the electrolytic hole is small, the portion above the insertion hole 501 located between two anode conductive components 600 is not blocked, allowing air to easily enter. The electrolytic cell has a vent b at this notch. A baffle block 700 is provided at the notch to cover the vent b. (Refer to...) Figure 6 As shown.

[0116] In this embodiment, a windbreak block 700 is provided at this location. The windbreak block 700 fills the space between the two anode conductive components 600, forming a complete windbreak plate that shields the area above the insertion hole 501 and blocks the wind from the electrolytic cell to prevent external wind blowing into the electrolytic cell from affecting the electrolysis and collection of rare earth.

[0117] Specifically, the suction hood assembly 800 also includes a swing arm 820 connecting the cover 810 and the base body 830. The swing arm 820 is hinged to the base body 830 via a pivot 870 and is driven by a cylinder 840 to drive the cover 810.

[0118] Specifically, the swing arm 820 and the cylinder 840 are connected by a transmission assembly.

[0119] The rotating shaft 870 includes a power input end and a power output end. The end of the swing arm 820 away from the cover 810 is fixedly connected to the power output end. The output end of the cylinder 840 is connected to the power input end through a transmission structure to drive the rotating shaft 870 to rotate the corresponding swing arm 820 relative to the base body 830.

[0120] In this embodiment, one side of the cover is driven to rotate by a cylinder 840, and the rotating shaft 870 of the other side cover is fixedly installed on the base body 830. The corresponding swing arm 820 is rotatably connected to the rotating shaft 870, and a damping structure is provided between the swing arm 820 and the rotating shaft 870. The damping structure can realize the suspension and positioning of the corresponding side swing arm 820 at any rotation angle. The transmission component is located inside the base body 830 and is covered by a dust cover to prevent dust and oil stains from falling onto the transmission structure and causing jamming during the transmission process.

[0121] The transmission assembly includes a rack 860 and a gear 850. The gear 850 is coaxially fixed to the rotating shaft 870. The end of the rack 860 is fixedly connected to the end of the piston rod of the cylinder 840, and the rack 860 meshes with the gear 850.

[0122] A guide structure is provided between the rack 860 and the base body 830, and the rack 860 slides linearly along the tangential direction of the gear 850 through the guide structure.

[0123] Specific reference Figure 11 As shown, gear 850 is coaxially fixed to the power input end of rotating shaft 870, and rack 860 is fixedly connected to the piston rod end of cylinder 840. Rack 860 meshes with gear 850. Cylinder 840 drives rack 860 to translate, and rack 860 drives gear 850 to drive rotating shaft 870 to rotate forward or backward. A guide structure is provided between rack 860 and base body 830. Rack 860 slides linearly along the tangential direction of gear 850 through the guide structure. The guide structure can improve the consistency of the translational direction of rack 860, thereby improving the smoothness of operation of the present invention.

[0124] The guiding structure includes several guide wheels 880 rotatably mounted on the base body 830. The guide wheels 880 are arranged opposite each other on both sides of the rack 860 perpendicular to the direction of movement, and the outer rings of the guide wheels 880 roll into contact with the outer wall of the rack 860. The rotating shaft 870 is arranged parallel to the height direction of the base body 830, and the rack 860 is slidably arranged along the horizontal direction of the base body 830. The sliding direction of the rack 860 is perpendicular to the axial direction of the rotating shaft 870, so that the horizontal driving force of the rack 860 is converted into a vertical axial rotational force after being transmitted by the gear 850, thereby driving the rotating shaft 870 to rotate in the vertical axial direction. The piston rod end of the cylinder 840 is provided with a mounting bracket 890. The end of the rack 860 near the cylinder 840 is oscillatingly connected to the mounting bracket 890 by a pin, so that the translational direction of the rack 860 can be slightly modified according to the usage environment, ensuring that the rack 860 and the gear 850 mesh stably for transmission.

[0125] Specifically, the cyclone dust collector 100 is connected to the outlet end of the suction pipe 1, and the top is used for air outlet; the bag dust collector 200 is connected to the output end of the cyclone dust collector 100.

[0126] The cyclone dust collector 100 and the bag dust collector sequentially perform dust removal and recovery on the flue gas.

[0127] Reference Figure 12 and Figure 13 As shown, in this embodiment, the cyclone dust collector 100 includes a cyclone cylinder 110 and a fan 120. The fan 120 is connected to the output end at the top of the cyclone cylinder 110 and drives the airflow into the inner cavity of the cyclone cylinder 110.

[0128] To ensure the driving effect of the airflow, in this embodiment, the fan 120 is set at the output end of the top of the cyclone 110. That is to say, the driving force of the fan 120 on the airflow gradually increases in the direction of gradually approaching the fan 120, so as to ensure that the driving force of the airflow in the cyclone 110 is sufficient to separate the flue gas.

[0129] In this embodiment, the flue gas in the airflow contains a small amount of rare earth elements and metal elements, which need to be separated and recovered. In this embodiment, the cyclone 110 includes a cylindrical cyclone section 111 and a cone-shaped collection section 112 formed at the lower end of the cyclone section 111 and configured as an inverted cone. The inlet 111.2 of the cyclone dust collector 100 is located on the circumferential surface of the cyclone section 111.

[0130] When the rotating airflow inside the cyclone 110 moves in a spiral shape along the cylinder wall, it forms a descending dust-laden airflow at the outer end. During the rotation, the strong centrifugal force throws the flue gas mixed in the airflow toward the cylinder wall. After the flue gas contacts the cylinder wall and impacts it, it loses its inertial force and falls along the cylinder wall into the collection section 112 by relying only on the inlet velocity and its own gravity.

[0131] In this embodiment, the collecting part 112 is configured as an inverted cone shape, and the flue gas gathers towards the center of the bottom along the inclined guide wall, thereby collecting the flue gas at the center of the bottom of the collecting part 112.

[0132] To ensure that the airflow direction entering the cyclone 110 is along the cylinder wall, in this embodiment, an air inlet 111.1 is provided on the outer periphery near the top of the cyclone 110, and an inlet 111.2 is provided on the air inlet 111.1; the outlet end of the suction pipe 1 is connected to the inlet 111.2, and the part of the pipe near the outlet end is horizontally arranged.

[0133] Because the outer wall structure of the cyclone 110 is special, being an arc-shaped structure, while the airflow direction output by the suction tube is straight, if the outlet end of the suction tube is directly connected to the outer wall of the cyclone 110, the airflow entering the cyclone 110 cannot form a rotating airflow along the tube wall. In this embodiment, an air inlet 111.1 is provided, and a horizontal air guide channel is provided inside the air inlet 111.1. The end of the air guide channel is connected to the tube wall of the cyclone 110, so that after the airflow is guided by the air guide channel, it can form a rotating airflow along the tube wall, thereby forming a spiral motion direction.

[0134] The cyclone airflow spirals within the cyclone 110 and moves from top to bottom. As it moves to the collection section 112, its inner diameter continuously narrows along the inclined guide wall of the collection section 112.

[0135] The cyclone 110 has an air outlet pipe 32 inside. The upper end of the air outlet pipe 32 is connected to the air outlet end, and the lower end is not higher than the lower end of the air inlet 111.1.

[0136] Reference Figure 14 As shown, after the rotating and descending airflow reaches the bottom of the collecting section 112, it turns upward along the axis of the cyclone 110, forming an upward inner swirling airflow. The inner swirling airflow enters the air outlet pipe 32 and is output from the cyclone 110 along the air outlet pipe 32.

[0137] Based on the above settings, the cyclone airflow can only move to the bottom and then be output from the air outlet 32, and cannot be output in the middle of the cyclone cylinder 110. In this way, the movement path of the cyclone airflow can be guaranteed, thereby ensuring that the flue gas mixed in the cyclone airflow can reach the bottom of the cyclone cylinder 110 and be collected.

[0138] In addition, in this embodiment, to improve airflow driving efficiency, a duct adapter 300 is provided between the top of the cyclone 110 and the fan 120. The duct adapter 300 is flared in the air outlet direction, as detailed in the following figure. Figure 15 As shown.

[0139] Preferably, in this embodiment, the inner diameter of the lower port of the air duct adapter 300 is consistent with the output end of the air outlet duct 32, and the inner diameter of the upper port is consistent with the input end of the fan 120. In this way, the airflow connection can be ensured to be stable. The airflow output from the air outlet duct 32 expands in the air duct adapter 300 to form an airflow with a large inner diameter, which can be adapted to the input end of the fan 120, thereby giving the fan 120 the maximum driving efficiency.

[0140] Preferably, in this embodiment, the fan 120 is a centrifugal fan 120, with airflow entering from the center and exiting from the side of the fan 120, which can control the cross-sectional area of ​​the output airflow.

[0141] In this embodiment, the front end of the bag filter 200 is connected to the air box 400, and the output end of the cyclone dust collector 100 is connected to the air box 400 through the air duct 3. (Refer to...) Figure 2 As shown.

[0142] The air box 400 is equipped with multiple inlets 111.2, which can connect to multiple air ducts 3. The airflow output from the multiple air ducts 3 converges in the air box 400 and forms a single airflow that is output from the outlet of the air box 400 to the bag filter dust collector 200 for further dust removal and recycling.

[0143] The air duct 3 is also made of PP or PE material.

[0144] Preferably, in order to improve dust removal efficiency, in this embodiment, at least two suction pipes 1 are connected to the cyclone 110.

[0145] In a typical factory setup, multiple electrolytic furnaces 50 are configured to perform electrolysis simultaneously. In this embodiment, a cyclone 110 is connected to three suction pipes 1, which can perform dust removal and recovery for the three electrolytic furnaces 50, thereby improving dust removal efficiency and reducing equipment installation.

[0146] In other embodiments, another form of connection method for the cyclone dust collector 100 can be provided to improve the efficiency of dust collection and recovery. Specifically, the cyclone dust collector 100 includes at least two cyclone cylinders 110 and a fan 120, and the tops of the two cyclone cylinders 110 are connected to the same input end of the fan 120.

[0147] Reference Figure 16 As shown, a cyclone dust collector 100 includes two cyclone tubes 110 and a fan 120. Both cyclone tubes 110 are connected to the same cyclone adapter 300, which has two input ends and one output end. The output end is connected to a fan 120, so that a fan 120 drives the airflow in the two cyclone tubes 110, thereby improving the driving efficiency and saving equipment costs.

[0148] Specifically, the suction pipe 1 is made of PP or PE material.

[0149] The PP or PE material suction pipe 1 does not contain any metal elements. Therefore, no new metals will be mixed in during the process of transporting flue gas, thus ensuring that the metal content in the flue gas will not increase. This ensures that the metals in the flue gas can be recovered as much as possible in the cyclone dust collector 100 and the bag dust collector.

[0150] Specifically, the output end of the bag filter is connected to an electrostatic precipitator.

[0151] Electrostatic precipitation is a method of gas dust removal. When dust-laden gas passes through a high-voltage electrostatic field, it is electrically separated. Dust particles combine with negative ions, becoming negatively charged, and then tend to discharge and deposit on the anode surface. It is used in metallurgical, chemical, and other industries to purify gases or recover useful dust particles. This method utilizes an electrostatic field to ionize the gas, causing dust particles to become charged and adsorb onto the electrodes. In a strong electric field, air molecules are ionized into positive ions and electrons. Electrons, on their way to the positive electrode, encounter dust particles, causing the dust particles to become negatively charged and adsorb onto the positive electrode for collection.

[0152] Example 2

[0153] This embodiment discloses a flue gas purification method applied to the flue gas purification and recovery system of the molten salt electrolysis furnace 50 described in Embodiment 1, comprising the following steps:

[0154] S1. During the electrolysis process, coolant is injected into the cooling channel (613) of the mounting base (610), and the coolant circulates throughout all mounting bases (610); at the same time, a cooling chamber 503 is provided in the furnace cover plate 500, through which coolant is introduced, and the high-temperature steam generated by the cooling liquid is separated, so that the coolant can continuously contact the electrical contact panel 510 of the furnace cover plate 500, thereby cooling the anode conductive component 600 installed on the electrical contact panel 510 and reducing the consumption of iron.

[0155] S2. The flue gas generated after electrolysis is drawn in and collected through the suction hood assembly 800;

[0156] S3. The flue gas is transported to the dust collection and recovery device 10 through the PP material suction pipe 1;

[0157] S4. The flue gas undergoes cyclone dust removal and bag dust removal in the dust removal and recovery device 10 in sequence. The metal is separated and recovered by cyclone dust removal in the cyclone dust collector 100. The remaining small metal particles are recovered and separated again in the bag dust collector box 200, thereby recovering the metal in the flue gas.

[0158] S5. The flue gas after being removed by the dust removal and recovery device 10 enters the electrostatic dust removal device through the suction pipe 1 for electrostatic dust removal.

[0159] In step S1, external coolant enters the cooling channel 613 of the mounting base 610 through the opening c on the mounting base 610, and cools the mounting base 610 as it moves along the cooling channel 613. Furthermore, since adjacent mounting bases 610 are connected through the connection port d, the 613 inside multiple mounting bases 610 are connected to form a complete cooling surface structure, which cools multiple mounting bases 610 synchronously, thereby making the consumption of iron elements in the mounting base 610 consistent.

[0160] Simultaneously, external coolant enters the cooling chamber 503 through the liquid guide pipe 5 and flows into the wind deflector 701 from the outlet pipe 5.1. This means the coolant preferentially enters the wind deflector 701, where some is rapidly vaporized into high-temperature steam that remains within it. The unvaporized steam remains liquid and exits from the outlet 504 below the wind deflector 701, entering the cooling chamber 503 to fill it. Furthermore, due to the action of the wind deflector 700, the high-temperature steam is blocked, remaining within the deflector 700. The high-temperature steam above the outlet 504 can contact the coolant below, cooling some of it and allowing some of the steam to mix into the coolant.

[0161] Cooling the anode conductive component 600 reduces the mixing of iron elements at the source, improves the yield of electrolysis, and makes it easier for the dust collection and recovery device 10 to recover the metal elements in the flue gas, as the flue gas contains fewer metal elements.

[0162] In step S2, the suction hood assembly 800 draws in all the flue gas to ensure the recovery efficiency of the flue gas, thereby ensuring the recovery efficiency of metal elements in the flue gas.

[0163] In step S4, the flue gas enters the cyclone dust collector 100 along the suction pipe 1. The dust collector rotates inside, and the larger metal particles in the flue gas move towards the outer wall under the action of centrifugal force. They reach the wall surface and fall into the ash hopper along the wall under the action of airflow and gravity, thereby achieving the purpose of separating metal elements from airflow and purifying and recovering the flue gas.

[0164] After one purification and recycling cycle, the flue gas enters the bag filter 200. Small particulate metal elements are still mixed in the flue gas. After passing through the bag filter 200, the small particulate flue gas is also filtered and the flue gas is collected to improve dust removal efficiency. It can also recycle most of the rare earth elements and metal elements mixed in the flue gas, reducing waste.

[0165] In step S3, a suction pipe 1 made of PP or PE material is used to reduce the mixing of metal elements during the transmission of flue gas, ensuring that the dust collection and recovery device 10 can completely recover the metal in the flue gas.

[0166] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A flue gas purification and recovery system for a molten salt electrolysis furnace, characterized in that: include, An electrolytic furnace (50) with an electrolytic cell includes a furnace cover plate (500) and a plurality of anode conductive components (600) disposed on the furnace cover plate (500); the furnace cover plate (500) has a hollow structure, the hollow part is configured as a cooling chamber (503), and the upper end face of the furnace cover plate (500) is provided with a gas outlet (504) communicating with the cooling chamber (503); The cooling chamber (503) is used to cool the anode conductive component (600); The suction hood assembly (800) includes at least two relatively openable covers (810). The suction hood assembly (800) is located above the electrolytic cell, and the suction port formed by the closed covers (810) can cover the opening of the electrolytic cell to suck up the waste gas generated by the electrolytic cell during the electrolysis process. The dust collection and recovery device (10) includes a cyclone dust collector (100) and a bag dust collector (200) connected by a suction pipe (1), wherein the cyclone dust collector (100) and the bag dust collector (200) sequentially filter and recover the absorbed waste gas; A liquid guide pipe (5) is provided inside the cooling chamber (503), and a wind baffle (700) is provided on the furnace cover plate (500). The wind baffle (700) is a shell structure with an opening at the lower end, and a wind baffle groove (701) extending to the opening is provided inside. The wind baffle groove (701) is connected above the air outlet (504). The wind baffle groove (701) is used to store the high-temperature steam formed by the cooling liquid when heated, so that the cooling liquid can be separated from it. The liquid guide tube (5) is provided with a liquid outlet tube (5.1), which extends into the windbreak groove (701) through the air outlet (504).

2. The flue gas purification and recovery system for a molten salt electrolysis furnace according to claim 1, characterized in that: The anode conductive component (600) includes an iron mounting base (610) and a copper contact plate (620). The mounting base (610) is provided with a cooling channel (613). The mounting base (610) and the contact plate (620) are stacked and fixed on the furnace cover plate (500) in sequence and are fixed by the same fixing component (630).

3. The flue gas purification and recovery system for a molten salt electrolysis furnace according to claim 2, characterized in that: The furnace cover (500) also includes a cover plate seat (520) located below the power receiving panel (510), and the cooling chamber (503) is located between the cover plate seat (520) and the power receiving panel (510); The liquid guide pipe (5) connects the external water supply device and the cooling chamber (503).

4. The flue gas purification and recovery system for the molten salt electrolysis furnace according to claim 1, characterized in that: The suction hood assembly (800) also includes a swing arm (820) connecting the cover (810) and the base body (830). The swing arm (820) is hinged to the base body (830) via a pivot (870) and driven by a cylinder (840) to drive the cover (810).

5. The flue gas purification and recovery system for the molten salt electrolysis furnace according to claim 4, characterized in that: The swing arm (820) and the cylinder (840) are connected by a transmission assembly, which includes a rack (860) and a gear (850). The gear (850) is coaxially fixed to the rotating shaft (870). The end of the rack (860) is fixedly connected to the end of the piston rod of the cylinder (840), and the rack (860) meshes with the gear (850). A guide structure is provided between the rack (860) and the base body (830), and the rack (860) slides linearly along the tangential direction of the gear (850) through the guide structure.

6. The flue gas purification and recovery system for a molten salt electrolysis furnace according to claim 1, characterized in that: The cyclone dust collector (100) is connected to the outlet end of the suction pipe (1), and the top is used for air outlet; the bag dust collector (200) is connected to the output end of the cyclone dust collector (100); The cyclone dust collector (100) and the bag dust collector (200) sequentially remove dust and recover waste gas.

7. The flue gas purification and recovery system for a molten salt electrolysis furnace according to claim 1, characterized in that: The suction pipe (1) is made of PP or PE material.

8. The flue gas purification and recovery system for a molten salt electrolysis furnace according to claim 6, characterized in that: The output end of the bag filter (200) is connected to an electrostatic dust removal device.

9. A flue gas purification and recovery method, applied to the flue gas purification and recovery system of the molten salt electrolysis furnace as described in claim 3, characterized in that: Includes the following steps, S1. During the electrolysis process, coolant is injected into the cooling channel (613) of the mounting base (610), and the coolant circulates throughout all mounting bases (610); at the same time, a cooling chamber (503) is set in the furnace cover plate (500), coolant is introduced, and the high-temperature steam generated by the coolant is separated, so that the coolant can continuously contact the electrical contact panel (510) of the furnace cover plate (500), thereby cooling the anode conductive component (600) installed on the electrical contact panel (510) and reducing the consumption of iron. S2. The flue gas generated after electrolysis is drawn in and collected through the suction hood assembly (800); S3. The flue gas is transported to the dust collection and recovery device (10) through the PP or PE material suction pipe (1); S4. The flue gas undergoes cyclone dust removal and bag dust removal in the dust removal and recovery device (10) in sequence. The metal is separated and recovered by cyclone in the cyclone dust collector (100), and the remaining small metal particles are recovered and separated again in the bag dust collector (200), thereby recovering the metal in the flue gas. S5. After being removed by the dust removal and recovery device (10), the flue gas enters the electrostatic dust removal device through the suction pipe (1) for electrostatic dust removal.

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