Fluorine-containing wastewater precipitation, recovery and purification equipment

Abstract

The invention relates to the technical field of wastewater treatment, in particular to fluorine-containing wastewater precipitation, recovery and purification equipment, a group of trays for containing calcium fluoride sludge and a stirring assembly matched with the trays are arranged in a heating furnace, a movable assembly comprises an elastic piece arranged at the bottom of the trays, and when the tray bears the maximum in the initial stage, the elastic piece can move up and down. The stirring rod stirs upper-layer sludge, the depth of the calcium fluoride sludge is reduced along with gradual evaporation of moisture in the calcium fluoride sludge in the tray, meanwhile, the weight of the tray is reduced, the tray moves upwards under the action of the elastic part, and the effective contact depth of the stirring rod and the sludge is maintained through cooperation of the stirring assembly and the movable assembly; through cooperation of the stirring assembly and the movable assembly, the upper layer of the calcium fluoride sludge is stirred firstly, the situation that the surface of the sludge crusts and hardens due to high temperature, water in the sludge volatilizes rapidly is avoided, and the height of a tray bearing the sludge is automatically adjusted along with gradual reduction of the water in the sludge; and the water volatilization efficiency is ensured through the variable stirring depth.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a fluoride-containing wastewater precipitation, recovery, and purification device. Background Technology

[0002] Fluoride-containing wastewater refers to wastewater containing fluorides generated during industrial production processes. It is commonly found in industries such as photovoltaic cell manufacturing, semiconductor etching, phosphate fertilizer production, metal smelting, and coal chemical industry. Excessive fluoride levels can lead to damage to surface water ecosystems, causing fish deaths and inhibiting plant photosynthesis. For environmental protection and economic benefits, it is necessary to recover fluoride resources from calcium fluoride sludge.

[0003] When treating small-scale fluoride-containing wastewater, calcium salts are added to the wastewater, causing fluoride ions to form calcium fluoride precipitate. The resulting calcium fluoride sludge after settling in the sedimentation tank has an extremely high water content. During purification, it needs to be dewatered by pressure filtration to reduce the water content. Direct high-temperature calcination would lead to a significant increase in energy consumption and calcination costs. High moisture content also reduces kiln temperature stability, prolongs calcination time, and easily clogs flue gas pipes. Pressure filtration significantly reduces the processing load of subsequent thermal drying or calcination. During the drying process of calcium fluoride sludge, it needs to be stirred. In some existing technologies, the contact depth between the stirring rod and the sludge is greatest initially, gradually decreasing as the drying time increases. Since the initial sludge has a high water content, if the stirring depth is too large, the grooves and gaps created by the stirring rod when stirring the sludge are likely to collapse and close rapidly due to the softness of the sludge. Figure 13 As shown, this prevents high-temperature air from reaching the broken sludge interior, thus affecting the evaporation of moisture from the sludge interior.

[0004] Therefore, the present invention provides a fluoride-containing wastewater sedimentation, recovery and purification device that can change the height of the sludge support and improve the water evaporation efficiency during the stirring process. Summary of the Invention

[0005] To address the limitation of existing stirring devices in improving the water evaporation efficiency of calcium fluoride sludge, this invention provides a fluoride-containing wastewater sedimentation, recovery, and purification device.

[0006] The technical solution adopted by this invention to solve its technical problem is: a fluoride-containing wastewater precipitation, recovery, and purification device, including a processing furnace and a heating furnace fixedly installed inside the processing furnace. The heating furnace is equipped with a set of trays for holding calcium fluoride sludge, and a stirring assembly that cooperates with the trays. The stirring assembly includes a set of movable stirring rods, and a movable component at the bottom of the trays to adjust the tray height. The movable component includes an elastic element at the bottom of the tray. Initially, when the tray bears the maximum load, the stirring rods stir the upper layer of sludge. As the water in the calcium fluoride sludge in the tray gradually evaporates, the depth of the calcium fluoride sludge decreases, and the weight of the tray decreases. The tray moves upward under the action of the elastic element. Through the cooperation of the stirring assembly and the movable component, the effective contact depth between the stirring rods and the sludge is maintained, preventing stirring failure due to the thinning of the sludge. At the same time, the stirring rods continuously scrape the surface, disrupting the hardening trend and maintaining the loose state of the sludge surface, creating a stable evaporation channel for the internal water.

[0007] Preferably, the movable component also includes a fixing ring fixedly connected to the bottom of the tray, a slider fixedly connected to the outside of the fixing ring, a fixing seat slidably connected to the outside of the fixing ring, the fixing seat being barrel-shaped, a set of sliding grooves being opened on the inner side of the fixing seat, the slider being slidably connected to the sliding grooves, and a set of connecting rods fixedly connected to the outside of the fixing seat, the end of the connecting rods away from the fixing seat being fixedly connected to the inner wall of the heating furnace.

[0008] Preferably, the elastic element is located inside the fixed seat and is fixedly connected to the bottom of the inner wall of the fixed seat, and the end of the elastic element away from the bottom of the inner wall of the fixed seat is fixedly connected to the fixed ring.

[0009] Preferably, the mixing assembly also includes a mixing seat located on top of the tray, and a set of extension rods are fixedly connected to the outside of the mixing seat, with the mixing rods located at the bottom of the extension rods.

[0010] Preferably, the stirring rod includes a fixed shaft that is fixedly connected to the extension rod and the bottom of the stirring base, and movable blades are rotatably connected to the fixed shaft.

[0011] Preferably, the number of fixed shafts on each extension rod is the same, but the distribution of the fixed shafts on each extension rod is not completely consistent. The distance between the fixed shafts on two adjacent extension rods and the distance between each fixed shaft distributed on the stirring seat and the center of the stirring seat are different.

[0012] Preferably, a drive motor is fixedly installed on the top of the processing furnace, and a drive shaft is fixedly connected to the output end of the drive motor. The drive shaft rotates through the top of the processing furnace and the heating furnace.

[0013] Preferably, the drive shaft rotates through the tray, the retaining ring, and the retaining seat, and the stirring seat is fixedly connected to the drive shaft.

[0014] Preferably, a first furnace door is installed on one side of the processing furnace, and a second furnace door is installed on one side of the heating furnace. The second furnace door corresponds to the first furnace door, and the size of the second furnace door is smaller than that of the first furnace door.

[0015] Preferably, a heating device is fixedly installed at the bottom of the heating furnace, and the heating device works in conjunction with the heating furnace to raise the temperature inside the furnace.

[0016] The beneficial effects of this invention are:

[0017] (1) The fluoride wastewater precipitation, recovery and purification equipment of the present invention, through the cooperation of the stirring component and the moving component, first stirs the upper layer of calcium fluoride sludge to avoid the surface of the sludge from hardening due to high temperature crusting, so that the water inside the sludge evaporates quickly. As the water inside the sludge gradually decreases, the height of the tray supporting the sludge is automatically adjusted. The stirring rod continuously scrapes the surface to destroy the hardening trend, maintains the loose state of the sludge surface, and forms an evaporation channel for the internal water. The variable stirring depth ensures the efficiency of water evaporation.

[0018] (2) The fluoride-containing wastewater precipitation, recovery and purification equipment of the present invention has fixed shafts arranged in an alternating manner on each extension rod so that the stirring rod can generate multiple stirring trajectories when rotating. Combined with the rotatable moving blades, the stirring rod breaks the sludge gaps differently, forming multi-track irregular stirring, increasing the contact surface between high temperature air and the interior of the sludge, and further enhancing the evaporation of water. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the working state of the processing furnace provided by the present invention;

[0022] Figure 3 This is a schematic diagram of the internal structure of the heating furnace provided by the present invention;

[0023] Figure 4 This is a schematic diagram showing the connection between the tray and the stirring assembly provided by the present invention;

[0024] Figure 5 A structural cross-sectional view of the active component provided by the present invention;

[0025] Figure 6 for Figure 5 Enlarged view of point A;

[0026] Figure 7 This is a schematic diagram showing the connection between the fixing base and the fixing ring provided by the present invention;

[0027] Figure 8 This is a schematic diagram of the stirring assembly structure provided by the present invention;

[0028] Figure 9 Schematic diagram of the movable blade structure provided by the present invention Figure 1 ;

[0029] Figure 10 Schematic diagram of the movable blade structure provided by the present invention Figure 2 ;

[0030] Figure 11 A bottom view of the stirring assembly provided by the present invention;

[0031] Figure 12 This is a schematic diagram illustrating how the stirring rod of the present invention maintains an effective contact depth with the sludge.

[0032] Figure 13 This is a schematic diagram showing the mixing rod in excessive contact with the sludge.

[0033] In the diagram: 1. Processing furnace; 11. First furnace door; 2. Heating furnace; 21. Second furnace door; 22. Heating device; 3. Drive motor; 31. Drive shaft; 4. Tray; 5. Stirring assembly; 51. Stirring seat; 52. Extension rod; 53. Stirring rod; 531. Fixed shaft; 532. Movable blade; 6. Movable assembly; 61. Fixed seat; 611. Slide groove; 62. Connecting rod; 63. Fixed ring; 631. Slider; 64. Elastic element. Detailed Implementation

[0034] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0035] Example: Figures 1-13As shown, the fluoride wastewater sedimentation, recovery, and purification equipment of the present invention includes a processing furnace 1 and a heating furnace 2 fixedly installed inside the processing furnace 1. The heating furnace 2 is equipped with a set of trays 4 for holding calcium fluoride sludge, and a stirring assembly 5 cooperating with the trays 4. The stirring assembly 5 includes a set of movable stirring rods 53. A movable component 6 for adjusting the height of the trays 4 is provided at the bottom of the trays 4. The movable component 6 includes an elastic element 64 disposed at the bottom of the trays 4. Initially, when the trays 4 bear the maximum load, the stirring rods 53 stir the upper layer of sludge. As the water in the calcium fluoride sludge in the trays 4 gradually evaporates, the depth of the calcium fluoride sludge decreases. As the weight of tray 4 decreases, tray 4 moves upward under the action of elastic element 64. The cooperation between stirring component 5 and moving component 6 maintains the effective contact depth between stirring rod 53 and sludge, preventing stirring failure due to sludge thinning. Simultaneously, shallow stirring only breaks down the surface hard shell, forming tiny gaps. This ensures high-temperature air penetration while preventing deep structural damage that could lead to gap collapse, significantly improving initial water evaporation efficiency. The high temperature (typically above 100℃) inside furnace 2 easily causes rapid water loss from the sludge surface, forming a hard shell that hinders internal water escape. Stirring rod 53 continuously scrapes the surface, disrupting the hardening trend and maintaining a loose sludge surface. Figure 12 As shown, this creates a stable evaporation channel for internal moisture.

[0036] In this embodiment, as Figure 5-6 As shown, the elastic element 64 is a spring, and its tray 4 lifting speed is basically synchronized with the sludge drying rate. Similarly, in other embodiments, a structure with similar function can be used to replace the spring in this embodiment, such as an elastic airbag or a rubber part or other combination structure with similar function.

[0037] In this embodiment, after the calcium fluoride sludge formed by chemical precipitation is initially filtered, further purification requires removing its internal moisture. The calcium fluoride sludge is then placed into tray 4. As the weight of the sludge increases, tray 4 begins to descend, increasing the distance between the stirring rod 53 and the bottom of tray 4 until tray 4 can no longer descend. The second furnace door 21 and the first furnace door 11 are then closed, and the heating device 22 and drive motor 3 are activated. When the stirring assembly 5 rotates, the lower end of the stirring rod 53 has a shallow contact depth with the calcium fluoride sludge. The stirring rod 53 breaks up the upper layer of sludge, allowing the interior of the sludge to come into contact with the high-temperature gas, accelerating the evaporation of moisture in the sludge. As the moisture gradually evaporates, the depth of the sludge in the tray 4 decreases, and the weight supported by the tray 4 also decreases. Under the action of the bottom elastic element 64, the tray 4 gradually moves upward, ensuring the contact depth between the stirring rod 53 and the sludge. In the early stage of mixing, a smaller contact depth between the stirring rod 53 and the sludge is ensured to avoid the stirring rod 53 breaking up the sludge and then closing again due to a larger contact depth, which would affect the evaporation of moisture inside the sludge. The effective contact depth is as follows: Figure 12As shown, after stirring with stirring rod 53, no gaps or collapse will occur, that is, no situation like... Figure 13 The situation shown is as described.

[0038] Specifically, such as Figures 3-10 As shown, the stirring assembly 5 also includes a stirring seat 51 located on top of the tray 4. A set of extension rods 52 are fixedly connected to the outside of the stirring seat 51, and the stirring rods 53 are located at the bottom of the extension rods 52. The number of fixed shafts 531 on each extension rod 52 is the same, but the distribution of the fixed shafts 531 on each extension rod 52 is not completely consistent. The distance between the fixed shafts 531 on two adjacent extension rods 52 and the distance between each fixed shaft 531 distributed on the stirring seat 51 and the center of the stirring seat 51 are different. A drive motor 3 is fixedly installed on the top of the processing furnace 1, and the drive motor 3 outputs... A drive shaft 31 is fixedly connected to the end of the mixing unit. The drive shaft 31 rotates through the top of the processing furnace 1 and the heating furnace 2. The drive shaft 31 rotates through the tray 4, the fixing ring 63, and the fixing seat 61. The mixing seat 51 is fixedly connected to the drive shaft 31. The mixing rod 53 includes a fixed shaft 531 fixedly connected to the extension rod 52 and the bottom of the mixing seat 51. Movable blades 532 are rotatably connected to the fixed shaft 531. The movable blades 532 are non-axisymmetrically arranged so that they rotate due to the different forces on the side walls when mixing sludge. The number of blades is two or more. Figure 9 and Figure 10 As shown in this embodiment, two structures of the movable blade 532 are given. When the stirring rod 53 rotates, it forms a multi-track irregular stirring, which expands the heating area of ​​the sludge and increases the water evaporation rate.

[0039] In this embodiment, the filtered calcium fluoride sludge is placed into the tray 4 through the second furnace door 21. The tray 4 has a limited depth, and an appropriate amount of calcium fluoride sludge is added to lower the tray 4 to its lowest position, i.e., the top of the fixing seat 61 abuts against the bottom of the tray 4. The upper edge of the tray 4 is provided with a bevel, and the depth of the sludge placed in does not exceed the height of the lower end of the bevel. At the same time, the bevel also plays a certain role in preventing splashing. In the initial stage of stirring, the moisture content in the sludge is relatively high, and the contact depth between the stirring rod 53 and the sludge is limited. At the same time, the rotation speed of the stirring rod 53 is relatively fast. Stirring prevents the sludge surface from hardening due to high temperature, which would hinder the evaporation of internal moisture. The lower end of the movable blade 532 contacts the upper layer of sludge. When the drive shaft 31 rotates, the stirring base 51, which is fixedly connected to the drive shaft 31, rotates accordingly, causing the extension rod 52 to drive the movable blade 532 to rotate. While the movable blade 532 revolves with the extension rod 52, it may also rotate on its own axis during sludge stirring because it is rotatably connected to the fixed shaft 531. This causes each movable blade to rotate. The different deflection angles of the 532 blades result in varying gaps created during sludge mixing, preventing the rotating trajectories of the 532 blades from completely overlapping and affecting water evaporation from the sludge. The drive motor 3 is a variable speed motor with adjustable speed. In the early heating stage, the speed of the stirring component 5 needs to be set relatively high. Initially, the calcium fluoride sludge has a high water content, high viscosity, and poor fluidity, requiring stirring to break up the colloidal structure and prevent the formation of a hard shell after surface water evaporation. Relatively fast stirring can enhance material agitation, allowing hot air to evenly contact the sludge surface, accelerating water evaporation, and reducing caking caused by localized overheating. In the middle heating stage, as the water content of the sludge decreases, the sludge gradually dries and hardens. Excessive stirring can increase the risk of dust pollution, so the stirring speed needs to be reduced. Appropriate stirring can maintain the looseness of the material, promote the migration of internal water to the surface, and prevent the destruction of the already formed dry layer. In the later heating stage, the water content of the calcium fluoride sludge further decreases. Low-speed stirring ensures that the material is heated evenly and avoids localized over-drying that could damage the calcium fluoride crystal structure.

[0040] The end of the extension rod 52 furthest from the mixing seat 51 is inclined downwards. The agitator 53 at the bottom of the extension rod 52 is shorter the farther it is from the center of the mixing seat 51. The agitator 53 at the bottom of the mixing seat 51, which is closer to the drive shaft 31, has a relatively low linear velocity, which can effectively drive the sludge in the central area and prevent the formation of a stagnant zone around the axis of the drive shaft 31. The agitator 53 at the bottom of the extension rod 52, which is farther from the center of the drive shaft 31, has a higher linear velocity than the agitator 53 closer to the drive shaft 31 due to the larger radius of its rotation path. This can generate high shear force and powerfully break up the clumps of sludge. The short agitator 53 at the far end of the extension rod 52 reduces the fluid resistance torque and centrifugal force it experiences, reduces the torque of the drive shaft 31 and the stress at the root of the rod, and eliminates the need for excessive structural reinforcement to support the large outer extension rod 52, thus reducing material costs and equipment weight.

[0041] In this embodiment, a movable blade 532 at the end of one of the extension rods 52 can be fixedly connected to a fixed shaft 531, and one end of the movable blade 532 is in contact with the vertical side wall of the tray 4. When rotating, it can scrape off the sludge on the inner wall of the tray 4, reducing the adhesion of sludge to the side wall of the tray 4. The distance between the fixed shaft 531 on each extension rod 52 and the center of the tray 4 is different, and the distance between the fixed shaft 531 on the stirring seat 51 and the center of the tray 4 is not exactly the same. Therefore, when the stirring seat 51 rotates, the movement trajectory of each fixed shaft 531 will form multiple circular trajectories of different diameters, avoiding the high overlap of the rotation paths of the stirring rods 53, which would affect the evaporation of water. Combined with the rotatable movable blade 532, the movable blade 532 is affected by the gradually drying sludge during rotation, causing it to rotate on its own axis while revolving around the central axis, further enhancing the efficiency of water evaporation.

[0042] Specifically, such as Figures 5-7 As shown, the active component 6 also includes a fixing ring 63 fixedly connected to the bottom of the tray 4. A slider 631 is fixedly connected to the outside of the fixing ring 63. A fixing seat 61 is slidably connected to the outside of the fixing ring 63. The fixing seat 61 is barrel-shaped. A set of sliding grooves 611 are opened on the inner side of the fixing seat 61. The slider 631 is slidably connected to the sliding grooves 611. A set of connecting rods 62 is fixedly connected to the outside of the fixing seat 61. The end of the connecting rods 62 away from the fixing seat 61 is fixedly connected to the inner wall of the heating furnace 2. An elastic element 64 is located inside the fixing seat 61 and is fixedly connected to the bottom of the inner wall of the fixing seat 61. The end of the elastic element 64 away from the bottom of the inner wall of the fixing seat 61 is fixedly connected to the fixing ring 63.

[0043] In this embodiment, the horizontal height of tray 4 is determined by its load-bearing weight. After adding an appropriate amount of sludge, tray 4 is lowered to its lowest point. As the moisture content of the calcium fluoride sludge gradually decreases, the sludge thickness in tray 4 decreases, and the load on tray 4 becomes lighter. Therefore, as the stirring time increases, the compressed elastic element 64 at the bottom of tray 4 gradually returns to its original position, gradually lifting tray 4 to compensate for the difference in contact depth between the tray 4 and the lower end of the movable blade 532 caused by the decrease in sludge depth. During the stirring process, when tray 4 moves, its bottom fixing ring 63 always slides within the fixing seat 61, and under the constraint of the sliding groove 611 and the slider 631, tray 4 remains relatively stable during the stirring process, preventing the drive shaft 31 from rotating. The stability of tray 4 is affected, as tray 4 can only move vertically. As the moisture content in the sludge gradually decreases, the contact depth between the stirring rod 53 and the sludge gradually increases. During the stirring process, when tray 4 moves to its highest position, the bottom of the movable blade 532 does not contact the bottom of tray 4. In the early stage of treatment, the contact depth between the stirring rod 53 and the sludge is small, which accelerates the evaporation of moisture in the upper layer of sludge. If the initial moisture content of the sludge is high, the contact depth between the stirring rod 53 and the sludge is large, and the sludge that breaks during stirring may close due to the flow, resulting in the water in the sludge not evaporating in time. Therefore, when the initial sludge depth is large, the upper layer should be stirred first to reduce the sludge thickness and weight, which is beneficial for subsequent treatment.

[0044] Specifically, such as Figure 1 and Figure 2 As shown, a first furnace door 11 is installed on one side of the processing furnace 1, and a second furnace door 21 is installed on one side of the heating furnace 2. The second furnace door 21 corresponds to the first furnace door 11, and the size of the second furnace door 21 is smaller than that of the first furnace door 11. A heating device 22 is fixedly installed at the bottom of the heating furnace 2. The heating device 22 cooperates with the heating furnace 2 and is used for heating the furnace inside the furnace 2.

[0045] In this embodiment, there is a cavity between the heating furnace 2 and the processing furnace 1. The heating device 22 only heats the inside of the heating furnace 2. The cavity forms a heat insulation layer, which reduces heat loss from the surface of the heating furnace 2 and reduces the interference of ambient temperature on the constant temperature inside the heating furnace 2. The depth adaptive stirring makes the sludge moisture content decrease evenly, reducing the heat load of subsequent heating and further preventing the flue gas pipe from being blocked.

[0046] Working principle: In use, an appropriate amount of dehydrated calcium fluoride sludge is placed into the tray 4 inside the heating furnace 2. The second furnace door 21 and the first furnace door 11 are closed. The heating device 22 and the drive motor 3 are started sequentially. The high temperature inside the heating furnace 2 promotes the evaporation of water in the calcium fluoride sludge, while the stirring component 5 continuously stirs the sludge. Initially, when the tray 4 is under heavy load, the elastic element 64 is compressed, limiting the contact depth between the stirring rod 53 and the sludge. When the stirring rod 53 rotates, it stirs the upper layer of the sludge, preventing the sludge surface from directly contacting the high-temperature air. The hardening of the crust allows the moisture inside the sludge to evaporate effectively. As the moisture inside the sludge gradually decreases, the weight borne by the tray 4 becomes lighter, and the depth of the sludge inside the tray 4 decreases. At this time, the tray 4 moves upward under the action of the bottom elastic element 64. As the depth of the sludge inside the tray 4 gradually decreases, the contact depth between the movable blade 532 and the sludge gradually and slowly increases and remains within the effective contact depth range. The fixed shafts 531 staggered on each extension rod 52, in conjunction with the rotatable movable blades 532, accelerate the evaporation of moisture inside the sludge, thereby improving the drying efficiency of the sludge.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fluoride-containing wastewater precipitation, recovery, and purification device, comprising a processing furnace and a heating furnace fixedly installed inside the processing furnace, wherein the heating furnace is provided with a set of trays for holding calcium fluoride sludge, and a stirring assembly cooperating with the trays, characterized in that: The mixing assembly includes a set of movable mixing rods, and the bottom of the tray has a movable component that can adjust the tray height; The movable component includes an elastic element located at the bottom of the tray. When the tray is initially under maximum load, the stirring rod stirs the upper layer of sludge. As the water in the calcium fluoride sludge in the tray gradually evaporates, the depth of the calcium fluoride sludge decreases, and the weight of the tray decreases. The tray moves upward under the action of the elastic element. The effective contact depth between the stirring rod and the sludge is maintained through the cooperation of the stirring component and the movable component. The stirring rod continuously scrapes the surface, destroying the hardening trend, maintaining the loose state of the sludge surface, and forming evaporation channels for the internal water.

2. The fluoride-containing wastewater precipitation, recovery, and purification equipment according to claim 1, characterized in that: The movable component also includes a fixing ring fixedly connected to the bottom of the tray. A slider is fixedly connected to the outside of the fixing ring. A fixing seat is slidably connected to the outside of the fixing ring. The fixing seat is barrel-shaped. A set of sliding grooves is opened on the inner side of the fixing seat. The slider is slidably connected to the sliding grooves. A set of connecting rods is fixedly connected to the outside of the fixing seat. The end of the connecting rod away from the fixing seat is fixedly connected to the inner wall of the heating furnace.

3. The fluoride-containing wastewater precipitation, recovery, and purification equipment according to claim 2, characterized in that: The elastic element is located inside the fixed base and is fixedly connected to the bottom of the inner wall of the fixed base. The end of the elastic element away from the bottom of the inner wall of the fixed base is fixedly connected to the fixed ring.

4. The fluoride-containing wastewater precipitation, recovery, and purification equipment according to claim 1, characterized in that: The mixing assembly also includes a mixing seat located on top of the tray, with a set of extension rods fixedly connected to the outside of the mixing seat, and the mixing rods located at the bottom of the extension rods.

5. The fluoride-containing wastewater precipitation, recovery, and purification equipment according to claim 4, characterized in that: The stirring rod includes a fixed shaft that is fixedly connected to the extension rod and the bottom of the stirring base, and movable blades are rotatably connected to the fixed shaft.

6. The fluoride-containing wastewater precipitation, recovery, and purification equipment according to claim 5, characterized in that: The number of fixed shafts on each extension rod is the same, but the distribution of the fixed shafts on each extension rod is not completely consistent. The distance between the fixed shafts on two adjacent extension rods and the distance between each fixed shaft on the stirring seat and the center of the stirring seat are different.

7. The fluoride-containing wastewater precipitation, recovery, and purification equipment according to claim 1, characterized in that: A drive motor is fixedly installed on the top of the processing furnace, and a drive shaft is fixedly connected to the output end of the drive motor. The drive shaft rotates through the top of the processing furnace and the heating furnace.

8. The fluoride-containing wastewater precipitation, recovery, and purification equipment according to claim 7, characterized in that: The drive shaft rotates through the tray, the fixing ring, and the fixing seat, and the stirring seat is fixedly connected to the drive shaft.

9. The fluoride-containing wastewater precipitation, recovery, and purification equipment according to claim 1, characterized in that: The processing furnace has a first furnace door installed on one side, and the heating furnace has a second furnace door installed on one side. The second furnace door corresponds to the first furnace door, and the size of the second furnace door is smaller than that of the first furnace door.

10. The fluoride-containing wastewater precipitation, recovery, and purification equipment according to claim 9, characterized in that: A heating device is fixedly installed at the bottom of the heating furnace. The heating device works in conjunction with the heating furnace to raise the temperature inside the furnace.

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