A fly ash heavy metal removal device

Abstract

The utility model discloses a fly ash heavy metal removal device, including main jar body, the main jar body includes the capture room and the removal room, the removal room is located capture room below, be provided with reagent feed inlet and acid immersion liquid water inlet on the capture room, be provided with the detection unit of the detection of PH on the capture room, be provided with the opening and closing bulkhead between the capture room and removal room, removal room bottom is provided with heavy metal precipitation discharge gate, be provided with the backflow pipe of intercommunication acid immersion liquid water inlet on the removal room. The utility model provides a fly ash heavy metal removal device can to acid immersion liquid carry out circulation processing, through the precipitation recovery of different heavy metal of adjusting different PH value, has improved recovery precision and can remove heavy metal to the greatest extent, reduces the waste of resources.

Description

Technical Field

[0001] This utility model relates to the field of fly ash treatment in waste incineration, and in particular to a fly ash heavy metal removal device. Background Technology

[0002] Municipal solid waste incineration fly ash refers to the residual material collected during the flue gas purification process at waste incineration plants. Fly ash mainly contains elements such as silicon, calcium, aluminum, iron, magnesium, sodium, potassium, and chlorine, as well as heavy metals such as zinc, lead, copper, cadmium, chromium, and nickel. Acid leaching is a typical method for removing chloride salts and heavy metals from fly ash; acid leaching is highly effective at dissolving chlorides and heavy metals.

[0003] For example, publication number "CN110526364A" discloses "a method for preparing polyaluminum-iron polysilicate flocculant using waste incineration fly ash", which includes the following steps: (1) mixing waste incineration fly ash with a co-solvent and reacting at 800℃-950℃ to obtain product A, wherein the co-solvent is at least two of sodium carbonate, sodium peroxide, potassium carbonate and calcium oxide; (2) dispersing product A in acid solution and stirring and acid leaching at 50℃-85℃; (3) adding a metal chelating agent, and after precipitation occurs, separating the solid and liquid to remove the solid, obtaining filtrate D; (4) allowing filtrate D to stand and then concentrating and filtering to obtain solid polyaluminum-iron polysilicate flocculant. However, in practical applications, this type of operation method cannot separate heavy metals in the acid leaching solution, resulting in a waste of resources. Summary of the Invention

[0004] In view of the problem mentioned in the background art that the existing technology cannot distinguish and collect different heavy metals, this utility model provides a fly ash heavy metal removal device that can circulate the acid leaching solution and precipitate and recover different heavy metals by adjusting different pH values, thereby improving the recovery accuracy and removing heavy metals to the greatest extent and reducing resource waste.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] A fly ash heavy metal removal device includes a main tank, which includes a capture chamber and a removal chamber. The removal chamber is located below the capture chamber. The capture chamber is provided with a reagent inlet and an acid leaching solution inlet. The capture chamber is provided with a detection unit capable of detecting pH. An opening and closing partition is provided between the capture chamber and the removal chamber. The bottom of the removal chamber is provided with a heavy metal precipitation outlet. The removal chamber is provided with a return pipe connected to the acid leaching solution inlet. In this application, the capture chamber and the removal chamber are combined, thereby reducing the process flow and allowing them to be carried out in the same device. The capture chamber is equipped with a reagent inlet and an acid leaching solution inlet. The pH value can be adjusted according to the feeding ratio in the capture chamber according to processing requirements, and the pH value is measured by a detection unit. This allows different reactions to take place in the capture chamber. After the capture chamber is debugged, the mixed solution in the capture chamber is discharged into the removal chamber by opening and closing the baffle. The heavy metal precipitate is discharged through the heavy metal precipitation outlet in the removal chamber. The remaining solution can be returned to the capture chamber through the acid leaching solution inlet via the return pipe to carry out reaction mixing at different pH values, thereby precipitating different types of heavy metals. Repeating the above operation can not only distinguish different types of heavy metals, but also reduce water resource consumption and ensure recycling.

[0007] Preferably, the opening and closing partition includes a fixed plate and a movable plate. The movable plate is slidably connected to the fixed plate. The movable plate is provided with a control through hole, and the fixed plate is provided with a docking through hole. When the movable plate slides relative to the fixed plate, the control through hole can be aligned or misaligned with the docking through hole. A motion control unit exposed on the outside of the main tank is connected to the movable plate. The fixed plate is fixedly connected to the main tank, while the movable plate can slide relative to the fixed plate. It is controlled by a motion control unit external to the main tank. The movable plate is provided with a control through hole, and the fixed plate is provided with a docking through hole. Preferably, there are several control through holes and docking through holes. When the movable plate moves, the control through holes and docking through holes can be aligned. When the control through holes and docking through holes are aligned, the capture chamber and the removal chamber are connected through the control through holes and docking through holes. When the control through holes and docking through holes are misaligned, the connection channel between the capture chamber and the removal chamber is blocked, and the solution in the capture chamber cannot enter the removal chamber. Therefore, during use, when it is necessary to adjust the pH value in the capture chamber, the control through holes and docking through holes are misaligned. When the adjustment is completed and the solution in the capture chamber needs to flow into the removal chamber, the control through holes and docking through holes are aligned.

[0008] Preferably, the motion control unit includes a bearing seat mounted on the main tank body, a threaded rod on the bearing seat, the threaded rod connecting to a movable plate, and a handwheel at the end of the threaded rod away from the movable plate. The motion control unit includes a bearing seat, a threaded rod, and a handwheel. The bearing seat is fixedly connected to the main tank body to ensure stability. The bearing seat and the threaded rod are threaded together, and rotation is controlled by the handwheel. The other end of the threaded rod is connected to the movable plate, thereby controlling the movement of the movable plate, which in turn allows for the alignment and misalignment of the control through-hole and the mating through-hole.

[0009] Preferably, the removal chamber is equipped with a stirring assembly, to which a reagent slurry pipe is connected. The reagent slurry pipe is connected to a reagent inlet, and the stirring assembly can drive the reagent slurry pipe to rotate. The reagent slurry pipe has an opening communicating with the capture chamber. The stirring assembly in the removal chamber can stir the mixed solution, ensuring thorough mixing. The reagent slurry pipe is connected to the stirring assembly, and during the operation of the stirring assembly, the reagent slurry pipe can also move accordingly. The reagent slurry pipe is connected to the reagent inlet. Since the reagent slurry pipe also needs to move during the operation of the stirring assembly, the top of the main tank is designed as an open, coverless structure. The stirring assembly is suspended above the top of the main tank via other support frames, thus preventing the reagent inlet from colliding with or interfering with other components during the movement of the reagent slurry pipe. Because the reagent slurry pipe is connected to the stirring assembly, during the movement of the stirring assembly… This design allows the solution inside the reagent preparation tube to slosh around fully. The opening allows the solution in the capture chamber to enter the reagent preparation tube. After the reagent is introduced into the reagent inlet, it mixes and reacts with the acid leaching solution inside the reagent preparation tube, preventing the reagent from directly entering the capture chamber and causing clumping. The reaction inside the reagent preparation tube is ensured to be thorough and uniform by the action of the stirring component. Subsequently, with the continuous action of the stirring component, the solution mixed inside the reagent preparation tube can also flow into the capture chamber through the opening, thereby ensuring that the pH value in the entire capture chamber meets the target. At the same time, the pre-pulping step is omitted, simplifying the production process. Furthermore, no additional water is added, reducing the cost of evaporation and salt separation of the treated solution.

[0010] Preferably, the stirring assembly includes a stirring shaft with several support rods on it. Each support rod has a baffle plate connected to its end. The pharmaceutical slurry tube is annular and has a clearance hole communicating with the opening. When the stirring assembly drives the pharmaceutical slurry tube to rotate, the support rods and the pharmaceutical slurry tube can be offset, and the baffle plate can be displaced to the position of the opening or the clearance hole. A support rod is connected to the stirring shaft, and a baffle is installed on the support rod. The slurry preparation pipe has an opening and a clearance hole, which are connected. The clearance hole is much smaller than the opening. The baffle can connect with the opening and clearance hole. Since the support rod is connected to the corresponding position of the opening and clearance hole through the baffle, relative displacement can occur between the stirring assembly and the slurry preparation pipe. The displacement stroke is the sum of the spans of the opening and clearance hole. Therefore, by controlling the forward and reverse rotation of the stirring assembly and its inertia, the alignment of the baffle with the opening or clearance hole can be controlled, thereby achieving the opening and closing of the opening. During use, firstly in the capture chamber... Acid leaching solution is injected, and the opening and baffle are misaligned. The acid leaching solution enters the reagent slurry tube through the opening. Then, the stirring component rotates, and the opening and baffle are aligned. The baffle seals the opening. The reagent is then injected, and it mixes with a small amount of acid leaching solution in the reagent slurry tube. The mixing efficiency is improved by the rotation of the stirring component. Although some solution will still seep out through the clearance hole, it can be ignored when the size is small. After thorough mixing in the reagent slurry tube, the opening and baffle are misaligned again, allowing the mixed solution in the reagent slurry tube to seep out through the opening. At the same time, the stirring component can be reversed to further improve the efficiency of the mixed solution seeping out from the opening.

[0011] Preferably, a thin rod is provided between the baffle and the support rod, and the size of the clearance hole is adapted to the size of the thin rod. The thin rod, being relatively small, reduces the size of the clearance hole, thereby reducing the amount of protrusion during mixing. Furthermore, the thin rod can be flattened to ensure complete alignment between the opening and the baffle, and also improves the connection strength between the stirring assembly and the reagent slurry pipe.

[0012] Preferably, the stirring assembly includes a spiral blade, which comprises several blade layers, with the size of the spiral blades in each blade layer increasing from top to bottom. The stirring assembly has multiple layers of spiral blades, and the size of the spiral blades in each blade layer is not the same, gradually increasing from top to bottom, thereby improving the stirring quality.

[0013] Preferably, a slurry cleaning component is slidably connected inside the pharmaceutical pulping pipe, and the slurry cleaning component is provided with a central scraping unit; the central scraping unit includes an internal scraper and bristles, and the size of the internal scraper is smaller than the diameter of the pharmaceutical pulping pipe. The slurry cleaning component, slidably connected inside the pharmaceutical pulping pipe, can slide relative to the pharmaceutical pulping pipe, thereby allowing the solution inside the pharmaceutical pulping pipe to react and pulp fully. Simultaneously, the relative movement of the slurry cleaning component helps to drain the solution from the pharmaceutical pulping pipe. Furthermore, controlling the size of the internal scraper to be smaller than the diameter of the pharmaceutical pulping pipe avoids interference with the baffle, and the bristles improve cleaning efficiency.

[0014] Preferably, the central scraping unit is provided with guide wheels on its side, and the slurry preparation pipe is provided with guide rails on both sides. The slurry cleaning assembly includes a drive component connecting the guide wheels, which drives the guide wheels to rotate. The guide wheels improve the smoothness of operation, and the guide rails on both sides of the slurry preparation pipe prevent the slurry cleaning assembly from jamming during movement, thus improving operational smoothness. Furthermore, the drive component, typically a motor, drives the guide wheels to rotate, thereby improving operational efficiency.

[0015] Preferably, the removal chamber is equipped with a squeezing assembly, which includes side wall scrapers and arc-shaped scrapers stacked vertically. The squeezing assembly also includes a lifting component capable of moving the side wall scrapers and arc-shaped scrapers up and down, and a rotating component capable of rotating the side wall scrapers and arc-shaped scrapers. The squeezing assembly, comprising side wall scrapers and arc-shaped scrapers, allows the arc-shaped scrapers to collect precipitates at a central location, while the side wall scrapers remove adhering substances from the side walls of the removal chamber. The arc-shaped scrapers, in conjunction with the side wall scrapers, discharge the precipitates from the heavy metal precipitate outlet. The squeezing assembly includes two drive sources: a lifting component and a rotating component. Typically, the rotating component is mounted on the lifting component, and the combination of the arc-shaped scraper and side wall scraper is connected to the rotating component, thereby achieving synchronous lifting and rotation, ensuring comprehensive scraping.

[0016] The beneficial effects of this utility model are as follows:

[0017] (1) It integrates heavy metal capture and removal, reducing subsequent treatment steps and lowering treatment costs;

[0018] (2) By observing the pH detection unit value, heavy metals are precipitated step by step by increasing the amount of reagent. The obtained heavy metal precipitate is used as raw material for secondary refining to achieve the purpose of waste resource utilization.

[0019] (3) The agent is added to the agent slurry pipeline and mixed directly with the waste liquid to be treated, reducing the step of slurry preparation in advance in the process, and no additional water is added, reducing the cost of evaporation and salt separation of the solution after treatment;

[0020] (4) The baffle on the support rod fits into the opening on the reagent slurry pipe to form a closed environment, and is driven to rotate back and forth by the stirring component, so that the reagent is fully slurried in the reagent slurry pipe, avoiding direct contact between the reagent and the large amount of acid leaching liquid in the capture chamber to form agglomerates;

[0021] (5) The slurry cleaning component can clean the slurry in the slurry preparation pipeline and also allow the slurry to be better mixed with the acid leaching solution through the round hole, thereby improving the processing efficiency.

[0022] (6) By staggering two movable plates and fixed plates, the capture chamber and the removal chamber are connected. By setting up a squeezing component, the slurry is squeezed and dewatered. With the help of a lift pump and filter plate, heavy metal precipitates with low water content are obtained, which improves the heavy metal removal efficiency.

[0023] (7) The side wall scraper can clean the heavy metal deposits on the interior wall, and the arc-shaped scraper can sweep the heavy metal deposits to the heavy metal deposit outlet, improving efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model.

[0025] Figure 2 This is a top view of the opening and closing partition in this utility model.

[0026] Figure 3 yes Figure 1 A magnified view of a portion of point A in the middle.

[0027] Figure 4 This is an isometric view of the stirring assembly in this utility model.

[0028] Figure 5 yes Figure 1 A magnified view of a section at point B.

[0029] Figure 6 This is a schematic diagram of the slurry cleaning component in this utility model.

[0030] Figure 7 This is a schematic diagram of the stirring assembly in this utility model.

[0031] Figure 8 This is a top view of the arc-shaped scraper in this utility model.

[0032] In the picture:

[0033] 1. Main tank body;

[0034] 11 Opening partition, 111 Fixed plate, 112 Movable plate, 113 Control through hole, 114 Docking through hole;

[0035] 12 Motion control unit, 121 Shaft seat, 122 Threaded rod, 123 Handwheel;

[0036] 2. Capture chamber; 21. Reagent inlet; 22. Acid leaching solution inlet; 23. Detection unit;

[0037] 24 Mixing assembly, 241 Support rod, 242 Baffle, 243 Thin rod, 244 Propeller blade, 245 Mixing shaft;

[0038] 25. Pulping pipe for pharmaceutical preparation; 251. Opening; 252. Clearance hole; 253. Guide rail.

[0039] 26 Slurry cleaning assembly, 261 Central scraping unit, 262 In-pipe scraper, 263 Brush bristles, 264 Guide wheel, 265 Drive unit;

[0040] 3 Removal chamber, 31 Heavy metal precipitation outlet, 32 Return pipe, 33 Extrusion assembly, 331 Side wall scraper, 332 Arc scraper, 333 Lifting component, 334 Rotating component;

[0041] 4. Support frame. Detailed Implementation

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0043] Example 1:

[0044] like Figure 1As shown, a fly ash heavy metal removal device includes a main tank 1, which includes a capture chamber 2 and a removal chamber 3. The removal chamber 3 is located below the capture chamber 2. The capture chamber 2 is provided with a reagent inlet 21 and an acid leaching solution inlet 22. The capture chamber 2 is provided with a detection unit 23 capable of detecting pH. An opening and closing partition 11 is provided between the capture chamber 2 and the removal chamber 3. The bottom of the removal chamber 3 is provided with a heavy metal precipitation outlet 31. The removal chamber 3 is provided with a return pipe 32 connected to the acid leaching solution inlet 22. In this application, the capture chamber 2 and the removal chamber 3 are combined, thereby reducing the process flow and allowing them to be carried out in the same device. The capture chamber 2 is equipped with a reagent inlet 21 and an acid leaching solution inlet 22. The pH value can be adjusted according to the feeding ratio in the capture chamber 2 based on processing requirements, and the pH value is measured by a detection unit 23. This allows different reactions to occur within the capture chamber 2. After adjustment in the capture chamber 2, the mixed solution in the capture chamber 2 is discharged into the removal chamber 3 by opening and closing the baffle 11. Heavy metal precipitates are discharged through the heavy metal precipitate outlet 31 in the removal chamber 3. The remaining solution can then re-enter the capture chamber 2 through the acid leaching solution inlet 22 via the return pipe 32 for mixing and reaction at different pH values, thereby precipitating different types of heavy metals. Repeating the above operation not only distinguishes different types of heavy metals but also reduces water resource consumption and ensures recycling. In this embodiment, a booster pump is installed in the return pipe, and a filter plate is installed between the return pipe and the removal chamber 3. Figure 1 , 2 As shown in Figure 3, the opening and closing partition 11 includes a fixed plate 111 and a movable plate 112. The movable plate 112 is slidably connected to the fixed plate 111. The movable plate 112 is provided with a control through hole 113, and the fixed plate 111 is provided with a docking through hole 114. When the movable plate 112 slides relative to the fixed plate 111, the control through hole 113 can be aligned or misaligned with the docking through hole 114. A motion control unit 12 exposed on the outside of the main tank body 1 is connected to the movable plate 112. The motion control unit 12 includes a bearing 121 provided on the main tank body 1, a threaded rod 122 on the bearing 121, the threaded rod 122 is connected to the movable plate 112, and a handwheel 123 is provided at the end of the threaded rod 122 away from the movable plate 112.

[0045] The fixed plate 111 is fixedly connected to the main tank 1, while the movable plate 112 can slide relative to the fixed plate 111. This is controlled by an external motion control unit 12 located on the main tank 1. The movable plate 112 has a control through hole 113, and the fixed plate 111 has a docking through hole 114. Preferably, several control through holes 113 and docking through holes 114 are provided. When the movable plate 112 moves, it can align the control through holes 113 and docking through holes 114. When the control through holes 113 and docking through holes 114 are aligned... Subsequently, the capture chamber 2 and the removal chamber 3 are connected through the control through hole 113 and the abutment through hole. When the control through hole 113 and the abutment through hole 114 are misaligned, the connection channel between the capture chamber 2 and the removal chamber 3 is blocked, and the solution in the capture chamber 2 cannot enter the removal chamber 3. Therefore, during use, when it is necessary to adjust the pH value in the capture chamber 2, the control through hole 113 and the abutment through hole 114 are misaligned. When the adjustment is completed and the solution in the capture chamber 2 needs to flow into the removal chamber 3, the control through hole 113 and the abutment through hole 114 are aligned. The motion control unit 12 includes a bearing 121, a threaded rod 122, and a handwheel 123. The bearing 121 is fixedly connected to the main tank 1 to ensure stability. The bearing 121 and the threaded rod 122 are threadedly connected and rotated by the handwheel 123. The other end of the threaded rod 122 is connected to the movable plate 112 to control the movement of the movable plate 112, thereby aligning and misaligning the control through hole 113 and the mating through hole 114.

[0046] like Figure 1 , 4As shown in Figure 5, a stirring assembly 24 is provided in the removal chamber 3. A chemical slurry pipe 25 is connected to the stirring assembly 24. The chemical slurry pipe 25 is connected to the chemical inlet 21. The stirring assembly 24 can drive the chemical slurry pipe 25 to rotate. An opening 251 communicating with the capture chamber 2 is provided on the chemical slurry pipe 25. A stirring assembly 24 is installed inside the removal chamber 3. The stirring assembly 24 can stir the mixed solution in the removal chamber 3, thereby ensuring thorough mixing. A reagent slurry pipe 25 is connected to the stirring assembly 24. During the operation of the stirring assembly 24, the reagent slurry pipe 25 can also move accordingly. The reagent slurry pipe 25 is connected to the reagent inlet 21. Since the reagent slurry pipe 25 also needs to move during the operation of the stirring assembly 24, the top of the main tank 1 is designed as an open opening 251 without a cover. The stirring assembly 24 is suspended above the top of the main tank 1 by the other support frames 4, so that the reagent inlet 21 will not collide with or interfere with other components during the operation of the reagent slurry pipe 25. Since the reagent slurry pipe 25 is connected to the stirring assembly 24, the stirring assembly... During the movement of component 24, the solution inside the pharmaceutical slurry tube 25 is fully agitated. The opening 251 allows the solution in the capture chamber 2 to enter the pharmaceutical slurry tube 25. After the pharmaceutical agent is introduced into the pharmaceutical inlet 21, the agent mixes and reacts with the acid leaching solution inside the pharmaceutical slurry tube 25, preventing the agent from directly entering the capture chamber 2 and causing clumping. The reaction inside the pharmaceutical slurry tube 25 is ensured to be sufficient and uniform by the action of the stirring component 24. Subsequently, with the continuous action of the stirring component 24, the solution mixed inside the pharmaceutical slurry tube 25 can also flow into the capture chamber 2 through the opening 251, thereby ensuring that the pH value in the entire capture chamber 2 meets the target. At the same time, the pre-slurry preparation step is omitted, the production process is simplified, and no additional water is added, reducing the cost of evaporation and salt separation of the treated solution.

[0047] like Figure 4 As shown, the stirring assembly 24 includes a stirring shaft 245, on which several support rods 241 are provided (only one support rod is shown in the figure). A baffle 242 is connected to the end of each support rod 241. The reagent slurry tube 25 is annular and has a clearance hole 252 communicating with the opening 251. When the stirring assembly 24 drives the reagent slurry tube 25 to rotate, the support rods 241 and the reagent slurry tube 25 can shift, allowing the baffle 242 to move to the position of the opening or the clearance hole 252. A thin rod 243 is provided between the baffle 242 and the support rod 241, and the size of the clearance hole 252 is adapted to the size of the thin rod 243. The stirring assembly 24 includes a spiral blade 244, which comprises several blade layers, with the size of the spiral blades 244 increasing from top to bottom within each blade layer.

[0048] A support rod 241 is connected to the stirring shaft, and a baffle 242 is provided on the support rod 241. The slurry preparation pipe 25 has an opening 251 and a clearance hole 252, which are connected. The clearance hole 252 is much smaller than the opening 251. The baffle 242 can connect with both the opening 251 and the clearance hole 252. Since the support rod 241 is connected to the corresponding positions of the opening 251 and the clearance hole 252 via the baffle 242, relative displacement is possible between the stirring assembly 24 and the slurry preparation pipe 25. The displacement stroke is the sum of the spans of the opening 251 and the clearance hole 252. Therefore, by controlling the forward and reverse rotation and inertia of the stirring assembly 24, the baffle 242 can be aligned with either the opening 251 or the clearance hole 252, thereby achieving the closing and opening of the opening 251. During operation, acid leaching solution is first injected into the capture chamber 2. At this time, the opening 251 and the baffle 242 are misaligned, and the acid leaching solution enters the reagent slurry tube 25 through the opening 251. Then, the stirring component 24 rotates, and the opening 251 and the baffle 242 are aligned. The baffle 242 blocks the opening 251. At this time, the reagent is injected, and the reagent mixes with a small amount of acid leaching solution in the reagent slurry tube 25. The mixing efficiency is improved by the rotation of the stirring component 24. Although there will still be some solution seeping out of the clearance hole 252, it can be ignored when the size is small. After the reagent is fully mixed in the reagent slurry tube 25, the opening 251 and the baffle 242 are misaligned, so that the mixed solution in the reagent slurry tube 25 seeps out through the opening 251. At the same time, the stirring component 24 can be reversed to improve the efficiency of the mixed solution seeping out from the opening 251. A thin rod 243 is provided between the baffle 242 and the support rod 241. The thin rod 243 is small in size. By providing the thin rod 243, the size of the clearance hole 252 can be reduced, thereby reducing the amount of protrusion during the mixing process. Furthermore, the thin rod 243 can be made flat, so that the opening 251 and the baffle 242 can be completely aligned, which can also improve the connection strength between the stirring assembly 24 and the reagent slurry pipe 25. The agitator blades 244 of the stirring assembly 24 are provided in multiple layers, and the size of the agitator blades 244 on each layer is not the same, with the size gradually increasing from top to bottom, thereby improving the mixing quality.

[0049] like Figure 5 , 6 As shown, a slurry cleaning assembly 26 is slidably connected inside the slurry preparation pipe 25. A central scraping unit 261 is provided on the slurry cleaning assembly 26. The central scraping unit 261 includes an internal scraper 262 and bristles 263. The size of the internal scraper 262 is smaller than the diameter of the slurry preparation pipe 25. A guide wheel 264 is provided on the side of the central scraping unit 261, and guide rails 253 are provided on both sides of the slurry preparation pipe 25. The slurry cleaning assembly 26 includes a driving component 265 connected to the guide wheel 264, which drives the guide wheel 264 to rotate.

[0050] The cleaning component 26, slidably connected within the chemical pulping pipe 25, can slide relative to the chemical pulping pipe 25, allowing the solution within the chemical pulping pipe 25 to fully react and pulp. Simultaneously, the relative movement of the cleaning component 26 helps to drain the solution from the chemical pulping pipe 25. Furthermore, the size of the scraper 262 inside the pipe is controlled to be smaller than the diameter of the chemical pulping pipe 25, thus avoiding interference with the baffle 242. Additionally, the bristles 263 improve cleaning efficiency. The guide wheels 264 enhance operational smoothness. Guide rails 253 are installed on both sides of the chemical pulping pipe 25, connecting the guide wheels 264 to prevent the cleaning component 26 from jamming during movement, improving operational smoothness. A drive component 265, typically a motor, is also provided, driving the guide wheels 264 to rotate, thereby improving operational efficiency.

[0051] like Figure 7 , 8 As shown, a pressing assembly 33 is provided in the removal chamber 3. The pressing assembly 33 includes a side wall scraper 331 and an arc-shaped scraper 332 stacked on top of each other. The pressing assembly 33 includes a lifting member 333 that can drive the side wall scraper 331 and the arc-shaped scraper 332 to move up and down. The pressing assembly 33 includes a rotating member 334 that can drive the side wall scraper 331 and the arc-shaped scraper 332 to rotate. The removal chamber 3 is equipped with a squeezing assembly 33, which includes a side wall scraper 331 and an arc-shaped scraper 332. The arc-shaped scraper 332 is used to collect the precipitate at the center, while the side wall scraper 331 can scrape off the adhering material on the side wall of the removal chamber 3. Together with the arc-shaped scraper 332, the precipitate can be discharged from the heavy metal precipitate outlet 31. The squeezing assembly 33 includes two drive sources: a lifting component 333 and a rotating component 334. Generally, the rotating component 334 is mounted on the lifting component 333, and the combination of the arc-shaped scraper 332 and the side wall scraper 331 is connected to the rotating component 334 to achieve synchronous lifting and rotation, thereby ensuring comprehensive scraping. In this embodiment, the side wall tube plate includes a main body plate, and several scraper blades are connected to the edge of the main body plate. The connection methods between the scraper blades and the main body plate include, but are not limited to, snap-fit ​​connection, insertion, and welding. In this embodiment, a groove is provided at the edge of the main body plate, and the scraper blades are installed through the groove connecting pin. In this embodiment, the arc-shaped scraper 332 has an arc-shaped structure when viewed from above and a plate-like structure when viewed from the front. A notch is provided near the heavy metal precipitate outlet 31 to allow the precipitate to enter the outlet more smoothly. A support frame 4 is provided in this embodiment to support the extrusion assembly and to fix the lifting component to the support frame 4.

Claims

1. A fly ash heavy metal removal device, comprising a main tank, characterized in that, The main tank includes a capture chamber and a removal chamber. The removal chamber is located below the capture chamber. The capture chamber is equipped with a reagent inlet and an acid leaching solution inlet. The capture chamber is equipped with a detection unit capable of detecting pH. An opening and closing partition is provided between the capture chamber and the removal chamber. The bottom of the removal chamber is equipped with a heavy metal precipitation outlet. The removal chamber is equipped with a return pipe connected to the acid leaching solution inlet.

2. The fly ash heavy metal removal device according to claim 1, characterized in that, The opening and closing partition includes a fixed plate and a movable plate. The movable plate is slidably connected to the fixed plate. The movable plate is provided with a control through hole, and the fixed plate is provided with a docking through hole. When the movable plate slides relative to the fixed plate, the control through hole can be aligned or misaligned with the docking through hole. A motion control unit exposed on the outside of the main tank is connected to the movable plate.

3. The fly ash heavy metal removal device according to claim 2, characterized in that, The motion control unit includes a bearing seat mounted on the main tank body, a threaded rod on the bearing seat, the threaded rod being connected to a movable plate, and a handwheel being mounted on the end of the threaded rod away from the movable plate.

4. The fly ash heavy metal removal device according to claim 1, characterized in that, The removal chamber is equipped with a stirring assembly, which is connected to a chemical slurry preparation pipe. The chemical slurry preparation pipe is connected to a chemical inlet. The stirring assembly can drive the chemical slurry preparation pipe to rotate. The chemical slurry preparation pipe has an opening that communicates with the capture chamber.

5. The fly ash heavy metal removal device according to claim 4, characterized in that, The stirring assembly includes a stirring shaft with several support rods on it. Each support rod has a baffle plate connected to its end. The pharmaceutical slurry tube is annular and has a clearance hole that communicates with the opening. When the stirring assembly drives the pharmaceutical slurry tube to rotate, the support rods and the pharmaceutical slurry tube can be offset, and the baffle plate can be moved to the position of the opening or the clearance hole.

6. The fly ash heavy metal removal device according to claim 5, characterized in that, A thin rod is provided between the baffle and the support rod, and the size of the clearance hole is adapted to the size of the thin rod.

7. The fly ash heavy metal removal device according to claim 4, characterized in that, The stirring assembly includes a spiral blade, which comprises several blade layers, with the size of the spiral blades in each blade layer increasing from top to bottom.

8. The fly ash heavy metal removal device according to claim 4, characterized in that, A slurry cleaning component is slidably connected inside the pharmaceutical slurry preparation pipe, and a central scraping unit is provided on the slurry cleaning component; the central scraping unit includes an inner scraper and bristles, and the size of the inner scraper is smaller than the diameter of the pharmaceutical slurry preparation pipe.

9. The fly ash heavy metal removal device according to claim 8, characterized in that, The central scraping unit is provided with a guide wheel on its side, and the pharmaceutical pulping pipe is provided with guide rails on both sides. The pulp cleaning assembly includes a drive component that connects to the guide wheel, and the drive component drives the guide wheel to rotate.

10. A fly ash heavy metal removal device according to any one of claims 1-9, characterized in that, The removal chamber is equipped with a squeezing assembly, which includes side wall scrapers and arc-shaped scrapers stacked vertically, a lifting component capable of driving the side wall scrapers and arc-shaped scrapers to move up and down, and a rotating component capable of driving the side wall scrapers and arc-shaped scrapers to rotate.

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