A fluorine-containing wastewater recovery treatment device

Abstract

The utility model relates to fluorine -containing wastewater treatment technical field especially a kind of fluorine -containing wastewater recovery treatment device, solve the problem of low fluorine -containing wastewater treatment efficiency, equipment land area and poor running stability in prior art. Including: reactor, the reactor is divided into cyclone impurity removal zone, fluoride ion reaction zone, recovery zone and dosing area in;The cyclone impurity removal zone, the fluoride ion reaction zone and the recovery zone are sequentially communicated;The dosing area is respectively communicated with the cyclone impurity removal zone and the fluoride ion reaction zone;Raw water inlet, the raw water inlet is set on the reactor, and the raw water inlet is communicated with the cyclone impurity removal zone;Treatment liquid outlet, the treatment liquid outlet is set on the reactor, and the treatment liquid outlet is communicated with the recovery zone. Device high integration, land area is small, operation efficiency is high, and system energy consumption is low.

Description

Technical Field

[0001] This utility model relates to the field of fluoride-containing wastewater treatment technology, and in particular to a fluoride-containing wastewater recovery and treatment device. Background Technology

[0002] Currently, the main technologies for treating fluoride-containing wastewater include chemical precipitation, coagulation sedimentation, calcium salt precipitation, adsorption, and ion exchange. However, these methods have many limitations in practical applications.

[0003] Chemical precipitation and coagulation sedimentation methods: Although simple to operate, they are difficult to make the fluoride content in wastewater consistently meet the standards, and the amount of reagents added is large, which easily generates a large amount of sludge and increases the difficulty of subsequent treatment.

[0004] Calcium salt precipitation method: Lime milk (Ca(OH)2) is usually used to react with fluoride ions to generate calcium fluoride (CaF2) precipitate. However, this method has low reaction efficiency, poor sludge settling performance, and is prone to equipment blockage. It is also difficult to meet the treatment requirements of high-concentration fluoride-containing wastewater.

[0005] Adsorption and ion exchange methods: Although they can effectively remove fluoride ions, they have high operating costs, the adsorption materials or resins are easily saturated, regeneration is difficult, and they are not suitable for large-scale application.

[0006] Induced crystallization technology: Although it can improve the recovery efficiency of calcium fluoride, it is complicated to operate, has poor adaptability to water quality fluctuations, and has high equipment investment and operation and maintenance costs.

[0007] In addition, existing fluoride-containing wastewater recovery devices generally have the following problems: Large footprint: Traditional reactors use a multi-stage series design, resulting in large equipment size, which is difficult to meet the needs of projects with limited land.

[0008] Low level of automation: Dosing, stirring and pH adjustment rely on manual operation, which results in insufficient control precision and affects the treatment effect.

[0009] Poor operational stability: Lime slurry is prone to scaling and clogging of pipes, and uneven stirring leads to poor sedimentation, affecting the recovery efficiency of calcium fluoride.

[0010] Low modularity: It is difficult to flexibly adjust the treatment scale according to changes in water volume, which limits the applicability of the equipment. Utility Model Content

[0011] The purpose of this invention is to provide a fluoride-containing wastewater recovery and treatment device that solves the problems of low treatment efficiency, large equipment footprint, and poor operational stability in the existing technology.

[0012] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a fluoride-containing wastewater recovery and treatment device, comprising: The reactor is divided into a cyclone impurity removal zone, a fluoride ion reaction zone, a recovery zone, and a dosing zone; the cyclone impurity removal zone, the fluoride ion reaction zone, and the recovery zone are sequentially connected; the dosing zone is connected to both the cyclone impurity removal zone and the fluoride ion reaction zone. The raw water inlet is located on the reactor and is connected to the cyclone impurity removal zone. The treatment liquid outlet is located on the reactor and is connected to the recovery area.

[0013] Furthermore, the vortex impurity removal zone includes a primary vortex impurity removal zone and a secondary vortex impurity removal zone that are connected to each other. The primary vortex impurity removal zone and the secondary vortex impurity removal zone are connected by a first water passage tunnel opened below their connection point.

[0014] Furthermore, the fluoride ion reaction zone includes a primary reaction zone, a secondary reaction zone, a tertiary reaction zone, and a quaternary reaction zone connected in sequence; The primary reaction zone and the secondary reaction zone are connected by a second water passage below their connection point; the secondary reaction zone and the tertiary reaction zone are connected by a third water passage above their connection point; the tertiary reaction zone and the quaternary reaction zone are connected by a fourth water passage below their connection point.

[0015] Furthermore, the secondary cyclone impurity removal zone and the primary reaction zone are connected by a fifth water passage opened above their connection point.

[0016] Furthermore, the fourth-stage reaction zone and the recovery zone are connected by a sixth water passage above the connection point between them.

[0017] Furthermore, the top of the primary cyclone impurity removal zone is provided with a first compressed air interface and a first lime slurry dosing port; the primary cyclone impurity removal zone is provided with a first pH meter; and the bottom of the primary cyclone impurity removal zone is provided with a first inclined plate. The top of the secondary cyclone impurity removal zone is provided with a second compressed air port and a second lime slurry dosing port; a second pH meter is provided inside the secondary cyclone impurity removal zone; a second inclined plate is provided at the bottom of the secondary cyclone impurity removal zone; Both the first lime slurry dosing port and the second lime slurry dosing port are connected to the lime slurry dosing area of ​​the dosing zone.

[0018] Furthermore, both the primary cyclone impurity removal zone and the secondary cyclone impurity removal zone have slag outlets at their bottoms, which are used to discharge insoluble residues from the primary and secondary cyclone impurity removal zones.

[0019] Furthermore, a third lime slurry dosing port is provided at the top of the primary reaction zone, and a first stirrer and a third pH meter are provided inside the primary reaction zone; The top of the secondary reaction zone is provided with a fourth lime slurry dosing port, and the secondary reaction zone is equipped with a second stirrer and a fourth pH meter; The top of the three-stage reaction zone is provided with an acid / PAC dosing port, and a third stirrer and a fifth pH meter are provided inside the three-stage reaction zone; The top of the fourth-stage reaction zone is provided with a PAM dosing port, and a fourth stirrer and a sixth pH meter are provided inside the fourth-stage reaction zone; The third and fourth lime slurry dosing ports are both connected to the lime slurry dosing area of ​​the dosing zone; the acid / PAC dosing port is connected to the acid / PAC dosing area of ​​the dosing zone; and the PAM dosing port is connected to the PAM dosing area of ​​the dosing zone.

[0020] Furthermore, a reflux port is provided at the bottom of the secondary reaction zone, and the reflux port is connected to the secondary cyclone impurity removal zone through a reflux pump.

[0021] Furthermore, a third compressed air interface is provided at the top of the recycling zone, and a fifth mixer and a sixth mixer are provided inside the recycling zone.

[0022] Furthermore, it also includes a canopy, which is positioned above the reactor.

[0023] Furthermore, a fourth compressed air port is provided at the top of the lime slurry dosing area, and a third inclined plate is provided at the bottom of the lime slurry dosing area.

[0024] Furthermore, a seventh mixer is provided in the acid / PAC dosing zone, and an eighth mixer is provided in the PAM dosing zone.

[0025] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: This utility model discloses a fluoride-containing wastewater recovery and treatment device, which adopts an integrated modular design. Through multi-functional partitioning, the reactor is divided into a cyclone impurity removal zone, a fluoride ion reaction zone, a recovery zone, and a dosing zone, achieving a high degree of integration within the reactor, reducing the floor space occupied, and improving the operating efficiency of the device. Furthermore, the two-stage cyclone impurity removal design, combined with cyclone stirring, enhances the impurity removal rate. The four-stage gradient fluoride ion reaction zone, combined with gradient stirring and gradient pH control, greatly improves the fluoride recovery rate. At the same time, multiple water passages are set up and arranged in an alternating vertical layout, which improves the turbulence state in the zone and shortens the reaction time in the zone. Furthermore, multiple pH monitors are used to achieve precise control of the dosage from the dosing area to the administration area.

[0026] Furthermore, a reflux port is opened at the bottom of the secondary reaction zone within the fluoride ion reaction zone to circulate the unreacted medium in the reaction zone to the cyclone impurity removal zone for recycling, thereby improving processing efficiency. Attached Figure Description

[0027] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a top view of the fluoride-containing wastewater recovery and treatment device provided by this utility model; Figure 2 This is a schematic diagram of the planar structure of the fluoride-containing wastewater recovery and treatment device provided by this utility model; Figure 3 This is a front view of the fluoride-containing wastewater recovery and treatment device provided by this utility model; The reference numerals in the attached figures are explained as follows: 1. Reactor; 10. Cyclone impurity removal zone; 100. Primary cyclone impurity removal zone; 1000. First compressed air interface; 1001. First lime slurry dosing port; 1002. First pH meter; 1003. First inclined plate; 101. Secondary cyclone impurity removal zone; 1010. Second compressed air interface; 1011. Second lime slurry dosing port; 1012. Second pH meter; 1013. Second inclined plate; 102. First water passage. 103. Slag outlet; 11. Fluoride ion reaction zone; 110. Primary reaction zone; 1100. Third lime slurry dosing port; 1101. First mixer; 1102. Third pH meter; 111. Secondary reaction zone; 1110. Fourth lime slurry dosing port; 1111. Second mixer; 1112. Fourth pH meter; 1113. Return outlet; 112. Tertiary reaction zone; 1120. Acid / PAC dosing port; 1121. 1121. Third mixer; 1122. Fifth pH meter; 113. Fourth reaction zone; 1130. PAM dosing port; 1131. Fourth mixer; 1132. Sixth pH meter; 114. Second water passage; 115. Third water passage; 116. Fourth water passage; 117. Fifth water passage; 118. Sixth water passage; 12. Recovery zone; 120. Third compressed air interface; 121. Fifth mixer; 122. 6. Mixer; 123. First pneumatic diaphragm pump; 124. Fourth inclined plate; 13. Dosing area; 130. Lime slurry dosing area; 1300. Fourth compressed air interface; 1301. Third inclined plate; 1302. Second pneumatic diaphragm pump; 131. Acid / PAC dosing area; 1310. Seventh mixer; 1311. Third pneumatic diaphragm pump; 132. PAM dosing area; 1320. Eighth mixer; 1321. Fourth pneumatic diaphragm pump; 2. Raw water inlet; 3. Treated liquid outlet; 4. Canopy. Detailed Implementation

[0028] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] See Figures 1 to 3 The fluoride-containing wastewater recovery and treatment device disclosed in this example includes a reactor 1, a raw water inlet 2, a treated liquid outlet 3, and a canopy 4.

[0030] Specifically, the interior of the reactor 1 is divided into a cyclone impurity removal zone 10, a fluoride ion reaction zone 11, a recovery zone 12, and a chemical dosing zone 13. The cyclone impurity removal zone 10, the fluoride ion reaction zone 11, and the recovery zone 12 are sequentially connected. The chemical dosing zone 13 is connected to both the cyclone impurity removal zone 10 and the fluoride ion reaction zone 11, providing them with the appropriate treatment agents.

[0031] In this example, an integrated modular design is adopted, dividing reactor 1 into multifunctional zones to achieve a high degree of integration and reduce the floor space required. The zones work collaboratively to achieve efficient treatment of fluoride-containing wastewater.

[0032] Raw water inlet 2 is located on reactor 1 and is connected to the cyclone removal zone 10. Treated liquid outlet 3 is located on reactor 1 and is connected to the recovery zone 12. Fluoride-containing wastewater is introduced into reactor 1 through raw water inlet 2, more specifically into the cyclone removal zone 10. With the assistance of the dosing zone 13, the wastewater passes sequentially through the cyclone removal zone 10 and the fluoride ion reaction zone 11 before entering the recovery zone 12 for effluent recovery.

[0033] Specifically, the fluoride-containing wastewater is introduced into the cyclone impurity removal zone 10 to remove impurities from the wastewater. In this example, the cyclone impurity removal zone 10 is divided into a primary cyclone impurity removal zone 100 and a secondary cyclone impurity removal zone 101, and the primary cyclone impurity removal zone 100 and the secondary cyclone impurity removal zone 101 are connected by a first water passage 102 opened at their connection point.

[0034] The primary cyclone impurity removal zone 100 has a first compressed air inlet 1000 and a first lime slurry dosing inlet 1001 at its top. A first pH meter 1002 is installed within the primary cyclone impurity removal zone 100, and a first inclined plate 1003 is installed at its bottom. Similarly, the secondary cyclone impurity removal zone 101 has a second compressed air inlet 1010 and a second lime slurry dosing inlet 1011 at its top. A second pH meter 1012 is installed within the secondary cyclone impurity removal zone 101, and a second inclined plate 1013 is installed at its bottom. Both the first lime slurry dosing inlet 1001 and the second lime slurry dosing inlet 1011 are connected to the lime slurry dosing zone 130 of the dosing zone 13.

[0035] The two-stage cyclone impurity removal system aims to completely remove impurities from the raw water and improve the impurity removal efficiency. An external compressed air source is introduced into the corresponding cyclone impurity removal zone via the first compressed air interface 1000 and the second compressed air interface 1010. Under the action of the compressed air, a cyclone is formed to initially separate impurities from the raw water.

[0036] The installation of the first inclined plate 1003 and the second inclined plate 1013 increases the effective settling area within the corresponding cyclone impurity removal zone. The "sliding sludge effect" generated on the surface of the inclined plates causes the settled sludge in the raw water to automatically slide down to the bottom sludge collection area of ​​the impurity removal zone, thereby increasing the sludge concentration.

[0037] The pH value in the primary cyclone impurity removal zone 100 is set at 3.5–5.0, and the pH value in the secondary cyclone impurity removal zone 101 is set at 5.0–6.5. By controlling the pH value in stages, in the primary cyclone impurity removal zone 100, the acidic conditions preferentially dissolve metallic impurities and inhibit premature precipitation of calcium fluoride. In the secondary cyclone impurity removal zone 101, the weakly acidic environment selectively induces calcium fluoride crystallization, thereby achieving the dual goals of impurity graded removal and high-purity calcium fluoride crystallization. This gradient pH control, combined with cyclone stirring, not only significantly improves the impurity removal rate and crystal quality but also optimizes reagent usage efficiency. The reagent dosage is controlled based on the pH value monitored by the pH meter, while also creating favorable conditions for subsequent reaction zone treatment. The gradient pH setting effectively avoids impurity encapsulation and improves crystal growth characteristics.

[0038] In addition, both the primary cyclone impurity removal zone 100 and the secondary cyclone impurity removal zone 101 have slag outlets 103 at the bottom to periodically discharge insoluble residues from the zones.

[0039] The fluoride ion reaction zone 11 is internally divided into a primary reaction zone 110, a secondary reaction zone 111, a tertiary reaction zone 112, and a quaternary reaction zone 113. The primary reaction zone 110 and the secondary reaction zone 111 are connected by a second water passage 114 below their connection point; the secondary reaction zone 111 and the tertiary reaction zone 112 are connected by a third water passage 115 above their connection point; and the tertiary reaction zone 112 and the quaternary reaction zone 113 are connected by a fourth water passage 116 below their connection point.

[0040] The pH value in the primary reaction zone 110 is set at 6.5–7.5, the pH value in the secondary reaction zone 111 is set at 7.5–9.0, the pH value in the tertiary reaction zone 112 is set at 7.5–8.5, and the pH value in the quaternary reaction zone 113 is set at 7.0–8.5. In this example, a four-stage pH gradient is used to control the pH in the fluoride ion reaction zone 11. The primary reaction zone 110 serves as the crystallization initiation zone, initiating the crystallization process through a weakly alkaline environment. In the secondary reaction zone 111, the alkalinity is increased to promote directional crystal growth. The tertiary reaction zone 112 maintains a stable pH value to achieve co-precipitation of heavy metals. The quaternary reaction zone 113 is adjusted to the optimal flocculation pH window.

[0041] This gradual pH control avoids precipitation and dissolution caused by sudden pH changes, allowing fluoride ions to fully contact the precipitant and gradually reach a supersaturated state, thus achieving efficient encapsulation and precipitation of fluoride ions. This not only ensures complete reaction of fluorides but also significantly improves the recovery rate of fluoride ions in wastewater.

[0042] In this example, the first-stage reaction zone 110 has a third lime slurry dosing port 1100 at its top, and also contains a first mixer 1101 and a third pH meter 1102. The second-stage reaction zone 111 has a fourth lime slurry dosing port 1110 at its top, and contains a second mixer 1111 and a fourth pH meter 1112. The third-stage reaction zone 112 has an acid / PAC dosing port 1120 at its top, and also contains a third mixer 1121 and a fourth pH meter 1122. The fourth-stage reaction zone 113 has a PAM dosing port 1130 at its top, and contains a fourth mixer 1131 and a sixth pH meter 1132.

[0043] Among them, the third lime slurry dosing port 1100 and the fourth lime slurry dosing port 1110 are both connected to the lime slurry dosing area 130 of the dosing area 13; the acid / PAC dosing port 1120 is connected to the acid / PAC dosing area 131 of the dosing area 13; and the PAM dosing port 1130 is connected to the PAM dosing area 132 of the dosing area 13.

[0044] The rotational speeds of the first mixer 1101 and the second mixer 1111 are controlled at 150 r / min, while the rotational speeds of the third mixer 1121 and the fourth mixer 1131 are controlled at 90 r / min. The fourth mixer 1131 uses a frame-type impeller. By performing differentiated stirring within the fluoride ion reaction zone 11, the calcium fluoride crystallization process is optimized.

[0045] The primary reaction zone 110 and the secondary reaction zone 111 employ high-speed stirring at 150 r / min to generate strong turbulence, promoting rapid dispersion of lime slurry and ion mass transfer, thereby increasing the crystal nucleation rate. In the tertiary reaction zone 112 and the quaternary reaction zone 113, the stirring speed is reduced to 90 r / min. The quaternary reaction zone 113 specifically utilizes a frame-type stirring impeller to create an axially dominant flow pattern, preventing the formed crystals from being damaged by shear and promoting the full extension of PAM molecular chains, thus increasing floc density. This gradient stirring mode of "strong mixing at the front end and weak flocculation at the back end" synergizes with the aforementioned pH gradient, significantly optimizing crystallization quality and efficiency.

[0046] In addition, a reflux port 1113 is provided at the bottom of the secondary reaction zone 111. The reflux port 1113 is connected to the aforementioned secondary cyclone impurity removal zone 101 through a reflux pump, and is used to return unreacted liquid and solid impurities to the secondary cyclone impurity removal zone 101 for further treatment.

[0047] In this example, the aforementioned secondary cyclone impurity removal zone 101 and the aforementioned primary reaction zone 110 are connected by a fifth water passage 117 located above their junction. The quaternary reaction zone 113 and the recovery zone 12 are connected by a sixth water passage 118 located above their junction. Combined with the aforementioned first water passage 102, second water passage 114, third water passage 115, fourth water passage 116, raw water inlet 2, and treated liquid outlet 3, a "top-in, bottom-out" water flow path is formed. By alternating the layout of the water passages, sufficient mixing and mass transfer are ensured while maintaining appropriate turbulence, achieving efficient treatment.

[0048] The aforementioned recovery zone 12 has a third compressed air inlet 120 at its top, and a fifth mixer 121 and a sixth mixer 122 are installed within it. Both mixers 121 and 122 employ frame-type impellers with a rotation speed of 40 r / min. The gentle axial flow generated by the frame-type agitation maintains the integrity of the floc structure while creating an orderly settling environment. Combined with the microbubbles generated by the compressed air, this achieves both air flotation separation and enhances floc density through micro-oscillation. A fourth inclined plate 124 is also installed at the bottom of the recovery zone 12 to improve recovery efficiency.

[0049] The bottom of the recycling zone 12 is also connected to the aforementioned treatment liquid outlet 3 via a first pneumatic diaphragm pump 123, through which the treated raw water is pumped to the next process.

[0050] The dosing zone 13 is divided into a lime slurry dosing zone 130, an acid / PAC dosing zone 131, and a PAM dosing zone 132. The reagent inlets for these three zones all extend in the opposite direction to the inlet of the corresponding dosing zone. This design extends the mixing contact time between the reagents and the wastewater, increases turbulent kinetic energy, and achieves synergistic optimization of reagent dispersion, mixing reaction, and energy consumption control.

[0051] Specifically, the top of the lime slurry dosing zone 130 is provided with a fourth compressed air port 1300, and the bottom is provided with a third inclined plate 1301. By introducing a compressed air source, an air vortex is formed in the lime slurry dosing zone 130, so that the lime slurry is fully stirred. Then, the uniformly stirred lime slurry is lifted to the corresponding lime slurry dosing port by the second pneumatic diaphragm pump 1302 at the bottom.

[0052] A seventh mixer 1310 is installed in the acid / PAC dosing zone 131. After the citric acid / PAC in the zone is thoroughly mixed, the agent is lifted to the corresponding dosing port by the third pneumatic diaphragm pump 1311 at the bottom of the dosing zone.

[0053] Similarly, an eighth mixer 1320 is installed in the PAM dosing zone 132 to thoroughly mix the PAM in the zone, and then the agent is lifted to the corresponding dosing port by the fourth pneumatic diaphragm pump 1321 at the bottom of the dosing zone.

[0054] In this example, a canopy 4 is also installed above the reactor 1, which can be selectively installed according to different actual usage scenarios.

[0055] In summary, the fluoride-containing wastewater recovery and treatment device disclosed in this utility model achieves efficient recovery and purification of fluoride-containing wastewater through modular design and multi-stage treatment processes. The core technological advantages of this device are mainly reflected in the following aspects: (1) The containerized modular design integrates the traditional decentralized wastewater treatment process into a single reactor, reducing the floor space. The reactor 1 is divided into four functional units: a cyclone removal zone 10, a fluoride ion reaction zone 11, a recovery zone 12, and a dosing zone 13. The reactors work together through an optimized connection design.

[0056] (2) A "top-in, bottom-out" water flow path was constructed, and a three-dimensional flow direction control was formed by alternating water passages (first water passage 102, second water passage 114, third water passage 115, fourth water passage 116, fifth water passage 117 and sixth water passage 118). This design not only ensures moderate turbulence conditions to promote mixing and mass transfer, but also realizes natural gravity flow, thus reducing system energy consumption.

[0057] (3) In the cyclone impurity removal zone 10, a two-stage series design (stage 100 and stage 101) is used to control the pH at 3.5~5.0 and 5.0~6.5 respectively; compressed air is used to form a cyclone stirring, and the inclined plate sedimentation structure significantly improves the sludge concentration and impurity removal rate, creating favorable conditions for subsequent treatment. (4) In the fluoride ion reaction zone 11, the four-level pH gradient control (6.5~7.5→7.5~9.0→7.5~8.5→7.0~8.5), combined with the differentiated stirring design and reflux port design, ensures complete reaction while improving calcium fluoride recovery rate and crystal purity.

[0058] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. A fluoride-containing wastewater recovery and treatment device, characterized in that, include: The reactor (1) is divided into a cyclone impurity removal zone (10), a fluoride ion reaction zone (11), a recovery zone (12), and a dosing zone (13); the cyclone impurity removal zone (10), the fluoride ion reaction zone (11), and the recovery zone (12) are connected in sequence; the dosing zone (13) is connected to the cyclone impurity removal zone (10) and the fluoride ion reaction zone (11), respectively. Raw water inlet (2), the raw water inlet (2) is opened on the reactor (1), and the raw water inlet (2) is connected to the cyclone impurity removal zone (10); The treatment liquid outlet (3) is located on the reactor (1) and is connected to the recovery zone (12).

2. The fluoride-containing wastewater recovery and treatment device according to claim 1, characterized in that, The vortex impurity removal zone (10) includes a primary vortex impurity removal zone (100) and a secondary vortex impurity removal zone (101) that are connected to each other. The primary vortex impurity removal zone (100) and the secondary vortex impurity removal zone (101) are connected by a first water passage (102) opened below the connection between the two.

3. The fluoride-containing wastewater recovery and treatment device according to claim 2, characterized in that, The fluoride ion reaction zone (11) includes a first-level reaction zone (110), a second-level reaction zone (111), a third-level reaction zone (112), and a fourth-level reaction zone (113) connected in sequence. The primary reaction zone (110) and the secondary reaction zone (111) are connected by a second water passage (114) below their connection point; the secondary reaction zone (111) and the tertiary reaction zone (112) are connected by a third water passage (115) above their connection point; the tertiary reaction zone (112) and the quaternary reaction zone (113) are connected by a fourth water passage (116) below their connection point.

4. The fluoride-containing wastewater recovery and treatment device according to claim 3, characterized in that, The secondary vortex impurity removal zone (101) and the primary reaction zone (110) are connected by a fifth water passage (117) above the junction of the two.

5. The fluoride-containing wastewater recovery and treatment device according to claim 3, characterized in that, The fourth-level reaction zone (113) and the recovery zone (12) are connected by a sixth water passage (118) above the connection between them.

6. The fluoride-containing wastewater recovery and treatment device according to claim 2, characterized in that, The first-stage cyclone impurity removal zone (100) is provided with a first compressed air port (1000) and a first lime milk dosing port (1001) at the top; a first pH monitor (1002) is provided in the first-stage cyclone impurity removal zone (100); and a first inclined plate (1003) is provided at the bottom of the first-stage cyclone impurity removal zone (100). The top of the secondary cyclone impurity removal zone (101) is provided with a second compressed air port (1010) and a second lime milk dosing port (1011); a second pH monitor (1012) is provided in the secondary cyclone impurity removal zone (101); and a second inclined plate (1013) is provided at the bottom of the secondary cyclone impurity removal zone (101). The first lime slurry dosing port (1001) and the second lime slurry dosing port (1011) are both connected to the lime slurry dosing area (130) of the dosing area (13).

7. The fluoride-containing wastewater recovery and treatment device according to claim 3, characterized in that, The top of the primary reaction zone (110) is provided with a third lime milk dosing port (1100), and the primary reaction zone (110) is provided with a first stirrer (1101) and a third pH monitor (1102). The secondary reaction zone (111) is provided with a fourth lime milk dosing port (1110) at the top. The secondary reaction zone (111) is provided with a second stirrer (1111) and a fourth pH meter (1112). The top of the three-stage reaction zone (112) is provided with an acid / PAC dosing port (1120), and a third stirrer (1121) and a fifth pH monitor (1122) are provided in the three-stage reaction zone (112). The top of the fourth-level reaction zone (113) is provided with a PAM dosing port (1130), and a fourth stirrer (1131) and a sixth pH monitor (1132) are provided in the fourth-level reaction zone (113). The third lime slurry dosing port (1100) and the fourth lime slurry dosing port (1110) are both connected to the lime slurry dosing area (130) of the dosing area (13); the acid / PAC dosing port (1120) is connected to the acid / PAC dosing area (131) of the dosing area (13); and the PAM dosing port (1130) is connected to the PAM dosing area (132) of the dosing area (13).

8. The fluoride-containing wastewater recovery and treatment device according to claim 3, characterized in that, The secondary reaction zone (111) has a reflux port (1113) at the bottom, and the reflux port (1113) is connected to the secondary cyclone impurity removal zone (101) through a reflux pump.

9. The fluoride-containing wastewater recovery and treatment device according to claim 1, characterized in that, The top of the recycling zone (12) is provided with a third compressed air port (120), and the recycling zone (12) is provided with a fifth mixer (121) and a sixth mixer (122).

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