Remediation device and method for cadmium-polluted soil

Abstract

The invention discloses a device and a method for repairing cadmium-polluted soil, belongs to the technical field of soil pollution, and aims to solve the technical problems that in the prior art, a repairing agent is not uniformly mixed with soil, the agent cannot permeate due to soil caking, magnetic biochar is difficult to separate from soil slurry, and blockage is easily caused. The device comprises a rack, a lower guide cover, an upper protective cover, a feeding hopper, a mounting frame, a crushing assembly, a stirring assembly, a remediation assembly and a driving assembly, the crushing assembly crushes soil, the stirring assembly drives the soil to be repeatedly turned over and refined, and the remediation assembly sprays a medicament through a liquid outlet hole and achieves filter-screen-free separation of magnetic biochar through a neodymium iron boron permanent magnet; according to the device, the integrated operation of soil smashing, medicament mixing and magnetic adsorption separation is achieved, the cadmium ion elution efficiency and remediation continuity are improved, and the device can be widely applied to the field of cadmium contaminated soil remediation.

Description

Technical Field

[0001] This invention relates to the field of soil pollution technology, and in particular to a device and method for remediating cadmium-contaminated soil. Background Technology

[0002] Cadmium pollution in soil has become an urgent environmental problem. Cadmium easily accumulates in soil and is difficult to degrade naturally. It not only damages the physical and chemical properties of soil and affects crop growth, but also enters the human body through the food chain, endangering human health. Currently, in the remediation process of cadmium-contaminated soil, soil pretreatment and thorough mixing of remediation agents with the soil are key steps to ensure the effectiveness of remediation.

[0003] In current soil remediation processes, contaminated soil often clumps together. Clumped soil has difficulty contacting remediation agents, preventing them from penetrating to the soil core and resulting in a "dry core" phenomenon. This prevents the sufficient leaching of cadmium ions from the soil, affecting the remediation effect. Furthermore, the lack of a stable power transmission structure during soil pulverization hinders efficient pulverization, and the pulverized soil is prone to secondary clumping, further reducing remediation efficiency.

[0004] During the mixing of remediation agents with soil, the agents are often applied via external spraying, which makes it difficult to achieve uniform mixing with the soil. Some soil layers may not come into contact with the remediation agents, leading to incomplete remediation. Furthermore, magnetic biochar is commonly used to adsorb cadmium ions from the soil during the remediation process. However, the adsorbed magnetic biochar is difficult to effectively separate from the soil slurry. If a filter screen is used for separation, clogging can easily occur, affecting the continuity of the remediation process.

[0005] Furthermore, the existing remediation equipment lacks a reliable sealing structure in its working chamber, making it prone to soil leakage during treatment. This not only affects the working environment but also wastes soil. Simultaneously, the equipment's power transmission components lack effective protection, leaving them exposed to the external environment for extended periods. This makes them susceptible to erosion from soil dust, affecting the operational stability and lifespan of the components, and consequently impacting the continuous operation capability of the entire remediation equipment. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies where agents are mostly applied via external spraying, making it difficult to achieve uniform mixing with the soil and preventing some soil from coming into contact with the remediation agents. Therefore, this invention proposes a device and method for remediating cadmium-contaminated soil.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A device for remediating cadmium-contaminated soil includes a frame, a lower guide cover bolted to one side of the top of the frame, a bottom inclined plate integrally formed on one side of the lower guide cover, an upper protective cover bolted to the top of the lower guide cover, and openings on the side of the upper protective cover and the lower guide cover away from the bottom inclined plate. A feed hopper bolted to one side of the top of the frame is also included, with one end of the feed hopper welded to one end of the bottom inclined plate. The upper protective cover and the lower guide cover are bolted to the side of the bottom inclined plate with a mounting frame. The mounting frame is equipped with a crushing component. The upper protective cover has a rotating shaft I that passes through it. The outer wall of the rotating shaft I is equipped with a stirring component. The soil falls into the bottom inclined plate through the feed hopper and is guided by the bottom inclined plate to the mounting frame. After being crushed by the crushing component, it enters the chamber formed by the upper protective cover and the lower guide cover. The stirring component turns the soil over to achieve soil refinement and solve the problem of soil clumping that prevents the agent from penetrating.

[0008] In one possible design, the pulverizing assembly includes a mounting shaft II that rotates through a mounting frame. The mounting frame has strip-shaped notches on both sides, and sliding limit plates are slidably connected within these notches. The sliding limit plates are fixedly connected to the mounting frame by bolts. A single mounting shaft I rotates between the two sliding limit plates. Multiple pulverizing blades I are bolted to the outer wall of the mounting shaft I, and multiple pulverizing blades II are fixedly sleeved on the outer wall of the mounting shaft II. The mounting shaft I and mounting shaft II rotate synchronously, driving the pulverizing blades I and II to shear and pulverize the soil. The sliding limit plates can slide along the strip-shaped notches to adjust the distance between the mounting shaft I and mounting shaft II, adapting to soils with different degrees of agglomeration.

[0009] In one possible design, two symmetrically arranged fixed arc-shaped plates are bolted inside the upper protective cover and the lower guide cover. An arc-shaped baffle is integrally formed on the side of each fixed arc-shaped plate that is close to the other. The mixing assembly includes two symmetrical connecting plates I bolted to the outer wall of the rotating shaft I. Push plates are bolted to both ends of each connecting plate I. The two push plates are centrally symmetrically arranged and are L-shaped. The two sides of the push plates respectively abut against the arc-shaped baffle and the fixed arc-shaped plate. Rotation of the rotating shaft I drives the connecting plates I and the push plates to rotate. The push plates scoop up the soil, while the arc-shaped baffle and the fixed arc-shaped plate prevent soil from falling off, causing the soil to be repeatedly turned over to achieve secondary crushing and improve soil fineness.

[0010] In one possible design, a common connecting plate II is bolted between the two arc-shaped baffles. A repair assembly is located at the bottom of the connecting plate II. This assembly includes multiple mounting ramps bolted to the bottom of the connecting plate II. One side of each mounting ramp has a mounting groove, within which a neodymium iron boron permanent magnet is embedded. Another side of each mounting ramp has multiple interconnected outlet holes. The top of each mounting ramp has an inlet port connected to the outlet holes. The bottom of the connecting plate II has multiple circular holes connected to the inlets. A connected inlet pipe is welded to the top of the connecting plate II, extending through the top of the inlet pipe to the outside of the upper protective cover. High-pressure repair agent enters the mounting ramp through the inlet pipe, the circular holes in the connecting plate II, and the inlet port, then is sprayed out from the outlet holes and mixed with the soil. The neodymium iron boron permanent magnet generates a strong magnetic field, which adsorbs and locks the magnetic biochar that adsorbs cadmium ions within the mounting groove, achieving filterless separation.

[0011] In one possible design, a drive assembly is bolted inside the frame. The drive assembly includes a servo motor bolted to the top of the frame. Both the servo motor and the outer wall of the rotating shaft I are fitted with synchronous pulleys I. The outer walls of the two synchronous pulleys I are fitted with the same synchronous belt I. The outer walls of the rotating shaft I and the rotating shaft II are both fitted with synchronous pulleys II. The outer walls of the two synchronous pulleys II are fitted with the same synchronous belt II. The servo motor drives the rotating shaft I to rotate through the synchronous pulleys I and the synchronous belt I. The rotating shaft I drives the rotating shaft II to rotate through the synchronous pulleys II and the synchronous belt II, providing stable power to the stirring assembly and the pulverizing assembly.

[0012] In one possible design, gear I is fixedly sleeved on the outside of the mounting shaft II, and gear II is fixedly sleeved on the outer wall of the rotating shaft II. Gear I and gear II mesh and drive each other. Both the outer walls of the rotating shaft II and the outer walls of the mounting shaft I are fixedly sleeved with sprockets. The outer walls of the two sprockets are driven by the same chain. The rotating shaft II drives the mounting shaft II to rotate through the meshing of gear I and gear II, and drives the mounting shaft I to rotate through the sprockets and the chain, so as to realize the synchronous operation of the crushing component and the stirring component.

[0013] In one possible design, a protective cover II is bolted to one side of the frame. The protective cover II is used to protect gear II, synchronous pulley II, and synchronous pulley I. A protective cover I is bolted to the other side of the frame. The protective cover I is used to protect sprockets and chains. Both protective covers I and protective covers II are made of stainless steel, which can prevent soil dust from corroding the power transmission components and extend the service life of the components.

[0014] In one possible design, a sealing cover is hinged to one side of the frame, and a fixing ring is welded to the top of the sealing cover. A rotating hook is hinged to one side of the upper cover. The rotating hook cooperates with the fixing ring to fix the sealing cover. The sealing cover is used to block the openings on one side of the upper cover and the lower guide cover. When the device is running, the rotating hook is hooked on the fixing ring to prevent the sealing cover from loosening and causing soil leakage, thus protecting the working environment.

[0015] A method for remediating cadmium-contaminated soil, applied to the aforementioned cadmium-contaminated soil remediation device, includes the following steps: S1. The contaminated soil is fed into the hopper and guided by the bottom inclined plate to the space between the two mounting frames; S2. Start the servo motor, which drives the crushing and mixing components through the drive component. Crushing blade I and crushing blade II crush the soil, and the push plate drives the soil to be repeatedly turned over to achieve secondary crushing. S3. The high-pressure remediation agent is sent in through the inlet pipe, enters the installation inclined plate through the connecting plate II and the inlet, and is sprayed out from the outlet hole to mix with the soil and wash away cadmium ions in the soil. S4. The neodymium iron boron permanent magnet generates a strong magnetic field, which adsorbs and locks the magnetic biochar that adsorbs cadmium ions in the installation tank, thereby achieving the separation of the adsorbent material from the soil slurry. S5. After the remediation is completed, open the sealed cover door, remove the soil that has been remediated to meet the standards, and complete the cadmium-contaminated soil remediation.

[0016] In this application, during use, the contaminated soil is fed into the space between two mounting frames through the feed hopper. After being crushed by crushing blade I and crushing blade II, the soil is prevented from clumping. The crushed soil enters the chamber inside the lower guide cover and the upper protective cover for repair. At this time, the rotating hook is hung on the fixing ring from the side to ensure that the sealing cover door cannot be opened and to prevent soil leakage. When the device is in use, the servo motor is started. The output shaft of the servo motor drives the rotating shaft I to rotate through the synchronous pulley I and the synchronous belt I. The rotating shaft I drives the rotating shaft II to rotate through the synchronous belt II and the synchronous pulley II. The rotating shaft II drives the mounting shaft II to rotate through the gear II and the gear I. The rotating shaft II drives the mounting shaft I to rotate through the chain and the sprocket, thereby providing power to the crushing blade I and the crushing blade II. At the same time, when the rotating shaft I rotates, it will also drive the two connecting plates I to rotate. The connecting plates I drive the external push plate to rotate. The push plate scoops up the soil below. The setting of the arc-shaped baffle and the fixed arc-shaped plate can prevent the soil from falling off along the original path. After the soil rises to the high point, it falls between the two arc-shaped baffles and returns to the bottom. This process is repeated to crush the soil again. Furthermore, as the soil passes through multiple inclined installation plates, the high-pressure remediation agent is introduced through the inlet pipe, enters the connecting plate II, and then enters the interior of the inclined installation plates through multiple inlets. Finally, it is sprayed out through multiple outlet holes, mixing with the soil to completely eliminate the dry core phenomenon where the agent cannot penetrate. This allows the agent and the magnetic biochar inside the lower guide cover to fully contact and wash away cadmium ions in the soil. In addition, the neodymium iron boron permanent magnet generates a strong magnetic field, which pulls and locks the magnetic biochar that adsorbs cadmium ions into the installation tank, achieving filterless separation of the adsorbent material and the mud, thus avoiding clogging.

[0017] Beneficial effects: The pulverizing assembly, with mounting shafts I and II driving pulverizer blades I and II respectively, effectively pulverizes the contaminated soil fed into the hopper, breaking up soil clumps. This provides favorable conditions for the penetration of subsequent remediation agents, ensuring sufficient contact between the agents and the soil, preventing dry core formation, and improving cadmium ion elution efficiency. The sliding limit plate can limit and fix mounting shaft I, while also allowing for adjustment of its position according to soil clumping conditions, adapting to the pulverizing needs of contaminated soil in different states.

[0018] The mixing component works in conjunction with the arc-shaped baffle and the fixed arc-shaped plate. The rotating shaft I drives the connecting plate I and the push plate to rotate. The push plate scoops up the soil inside the lower guide cover and the upper protective cover. The arc-shaped baffle and the fixed arc-shaped plate can prevent the soil from falling off along the original path. After the soil rises to the highest point, it falls between the two arc-shaped baffles, realizing repeated turning and secondary crushing of the soil, further refining the soil particles and improving the uniformity of mixing between the remediation agent and the soil.

[0019] The remediation component is designed so that the high-pressure remediation agent enters the connecting plate II through the inlet pipe, then is fed into the installation inclined plate through the inlet, and finally sprayed out through the outlet. This achieves precise mixing of the remediation agent with the soil, ensuring that the agent can penetrate to all parts of the soil and fully wash away cadmium ions. The neodymium iron boron permanent magnet inside the installation inclined plate generates a strong magnetic field, which can quickly adsorb and lock the magnetic biochar that adsorbs cadmium ions into the installation groove. This achieves filterless separation of magnetic biochar and soil slurry, avoiding blockage during the separation process and ensuring the continuity of the remediation process.

[0020] The drive assembly, through the cooperation of servo motors, synchronous pulleys, synchronous belts, gears, sprockets, and chains, achieves stable power transmission and simultaneously provides power to rotating shaft I, mounting shaft I, and mounting shaft II, ensuring the synchronous operation of the crushing and mixing components and improving the operating efficiency of the device. The power transmission process is stable and reliable, reducing power loss and ensuring long-term stable operation of the device.

[0021] Protective covers I and II respectively protect the sprockets, chains, gears II, synchronizer II, and synchronizer I, effectively preventing soil dust from corroding the power transmission components, extending their service life, and ensuring the stability of power transmission. The sealing door is secured by a rotating hook and a fixing ring, effectively sealing the openings on one side of the upper and lower guide covers, preventing soil leakage during processing, protecting the working environment, and reducing soil waste. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural schematic diagram of a cadmium-contaminated soil remediation device proposed in this invention; Figure 2 This is a three-dimensional view from a second perspective of a cadmium-contaminated soil remediation device proposed in this invention. Figure 3 This is a three-dimensional diagram of the internal structure of a cadmium-contaminated soil remediation device proposed in this invention. Figure 4 This is a three-dimensional view from a second perspective of the internal structure of a cadmium-contaminated soil remediation device proposed in this invention. Figure 5 This is a three-dimensional view of the feed hopper and mounting frame in a cadmium-contaminated soil remediation device proposed in this invention. Figure 6 This is an exploded view of the mounting frame and sliding limiting plate in a cadmium-contaminated soil remediation device proposed in this invention. Figure 7 This is an exploded view of the servo motor and gear I in a cadmium-contaminated soil remediation device proposed in this invention. Figure 8 This is a three-dimensional view of the fixed arc plate and connecting plate in a cadmium-contaminated soil remediation device proposed in this invention; Figure 9 This is an exploded view of the fixed arc plate and connecting plate in a cadmium-contaminated soil remediation device proposed in this invention. Figure 10 This is an exploded view of the connecting plate and the mounting inclined plate in a cadmium-contaminated soil remediation device proposed in this invention. Figure 11 This is an exploded view of an inclined plate and neodymium iron boron permanent magnet installed in a cadmium-contaminated soil remediation device proposed in this invention.

[0023] In the diagram: 1. Frame; 2. Protective cover I; 3. Feed hopper; 4. Upper protective cover; 5. Rotating hook; 6. Fixing ring; 7. Sealing door; 8. Servo motor; 9. Protective cover II; 10. Chain; 11. Mounting shaft I; 12. Rotating shaft II; 13. Rotating shaft I; 14. Fixed arc plate; 15. Lower guide cover; 16. Mounting frame; 17. Mounting shaft II; 18. Crusher I; 19. Strip notch; 20. Sliding limit plate; 21. Bottom inclined plate; 22. Crusher II; 23. Gear I; 24. Gear II; 25. Push plate; 26. Connecting plate I; 27. Liquid inlet pipe; 28. Connecting plate II; 29. ​​Arc baffle; 30. Liquid inlet; 31. Mounting inclined plate; 32. Liquid outlet; 33. Mounting groove; 34. Neodymium iron boron permanent magnet; 35. Sprocket. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] In one embodiment: Refer to Figure 1-11A device and method for remediating cadmium-contaminated soil are disclosed. The specific implementation of this application is as follows: A frame 1 serves as the mounting base for the entire device. All components are directly or indirectly mounted on the frame 1. A lower guide cover 15 is fixedly mounted on one side of the top of the frame 1. A bottom inclined plate 21 is fixedly connected to one side of the lower guide cover 15. The bottom inclined plate 21 is used to guide the soil fed from the feed hopper 3 to the soil guide mounting frame 16. An upper protective cover 4 is fixedly mounted on the top of the lower guide cover 15. The upper protective cover 4 and the lower guide cover 15 are far apart. An opening is provided on one side of the bottom inclined plate 21 for subsequent soil removal or maintenance. Mounting frames 16 are fixedly connected to the upper protective cover 4 and the lower guide cover 15 near the bottom inclined plate 21. The mounting frames 16 are located on both sides of the bottom inclined plate 21. A feed hopper 3 is fixedly installed on one side of the top of the frame 1, with one end of the feed hopper 3 fixedly connected to one end of the bottom inclined plate 21. After soil is fed through the feed hopper 3, it slides down the bottom inclined plate 21 between the two mounting frames 16. The interior of the mounting frames 16 is equipped with a mechanism for soil... The soil pulverizing component, in order to achieve thorough soil pulverization and avoid caking that would affect subsequent remediation results, includes a mounting shaft II 17 that rotates through a mounting frame 16. Both sides of the mounting frame 16 have strip-shaped notches 19, and sliding limit plates 20 are slidably connected inside the strip-shaped notches 19. The sliding limit plates 20 are fixedly mounted on one side of the mounting frame 16 by screws. Specifically, the screws pass through the sliding limit plates 20 and are threadedly connected to the mounting frame 16 to fix the sliding limit plates 20. A single mounting shaft I 11 rotates between the two sliding limit plates 20. Multiple pulverizing blades I 18 are fixedly mounted on the outer wall of the mounting shaft I 11, and multiple pulverizing blades II 22 are fixedly sleeved on the outer wall of the mounting shaft II 17. When the mounting shafts I 11 and II 17 rotate, they drive the pulverizing blades I 18 and II 22 to rotate synchronously, pulverizing the slipping soil. The sliding limit plates 20 can slide along the strip-shaped notches 19 to adjust the distance between the mounting shafts I 11 and II 17, adapting to soils with different degrees of caking.

[0026] Two symmetrically arranged fixed arc-shaped plates 14 are fixedly installed inside the upper protective cover 4 and the lower guide cover 15. Arc-shaped baffles 29 are fixedly connected to the sides of the two fixed arc-shaped plates 14 that are close to each other. Specifically, the fixed arc-shaped plates 14 are fixed to the inner walls of the upper protective cover 4 and the lower guide cover 15 by welding. The arc-shaped baffles 29 are integrally formed with the fixed arc-shaped plates 14. A rotating shaft I13 passes through the interior of the upper protective cover 4. A mixing assembly for mixing the soil is provided on the outer wall of the rotating shaft I13. The mixing assembly includes two symmetrically arranged connecting plates I26 fixedly installed on the outer wall of the rotating shaft I13. Pushers are fixedly installed at both ends of the connecting plates I26. The moving plate 25 and the two pushing plates 25 are arranged symmetrically at the center. The pushing plates 25 are L-shaped. The two sides of the pushing plates 25 abut against the arc-shaped baffle 29 and the fixed arc-shaped plate 14 respectively. When the rotating shaft I13 rotates, it drives the two connecting plates I26 to rotate. The connecting plates I26 drive the external pushing plates 25 to rotate. The pushing plates 25 scoop up the soil inside the lower guide cover 15 and the upper protective cover 4. The setting of the arc-shaped baffle 29 and the fixed arc-shaped plate 14 can prevent the soil from falling off along the original path. After the soil rises to the highest point, it falls between the two arc-shaped baffles 29 and returns to the bottom. This process is repeated to crush the soil again and further refine the soil particles.

[0027] A common connecting plate II 28 is fixedly connected between the two arc-shaped baffles 29. Specifically, both ends of the connecting plate II 28 are fixed to the two arc-shaped baffles 29 by bolts. A soil remediation component is provided at the bottom of the connecting plate II 28. The remediation component includes multiple mounting inclined plates 31 fixedly installed at the bottom of the connecting plate II 28. One side of the mounting inclined plate 31 has a mounting groove 33, and a neodymium iron boron permanent magnet 34 is fixedly embedded inside the mounting groove 33. Multiple interconnected liquid outlet holes 32 are provided on one side of the mounting inclined plate 31, and a interconnected liquid inlet 30 is provided at the top of the mounting inclined plate 31. The liquid inlet 30 is connected to the liquid outlet holes 32. Multiple... The inlet 30 is connected to a circular hole, and the top of the connecting plate II 28 is fixedly connected to an inlet pipe 27. The top of the inlet pipe 27 extends to the outside of the upper protective cover 4. The high-pressure repair agent is sent in through the inlet pipe 27, enters the connecting plate II 28, and then enters the interior of the installation inclined plate 31 through multiple inlets 30. Finally, it is sprayed out through multiple outlet holes 32 to mix with the soil, ensuring that the agent can penetrate into all parts of the soil and fully wash away cadmium ions in the soil. At the same time, the neodymium iron boron permanent magnet 34 generates a strong magnetic field, which pulls the magnetic biochar that adsorbs cadmium ions into the installation tank 33 and locks it in the installation tank 33, realizing the filterless separation of the adsorbent material and the mud and avoiding clogging.

[0028] A drive assembly is fixedly installed inside the frame 1. The drive assembly provides power to the rotating shaft I 13 and the crushing assembly. The drive assembly includes a servo motor 8 fixedly installed on the top of the frame 1. Synchronous pulleys I are fixedly sleeved on the outer walls of both the servo motor 8 and the rotating shaft I 13. The outer walls of the two synchronous pulleys I are driven by the same synchronous belt I. Synchronous pulleys II are fixedly sleeved on the outer walls of both the rotating shaft I 13 and the rotating shaft II 12. The outer walls of the two synchronous pulleys II are driven by the same synchronous belt II. Gear I 23 is fixedly sleeved on the outside of the mounting shaft II 17. Gear II 24 is fixedly sleeved on the outside of the rotating shaft II 12. Gear I 23 and gear II 24 mesh with each other. Both the outer wall of the rotating shaft II12 and the outer wall of the mounting shaft I11 are fixedly fitted with sprockets 35. The outer walls of the two sprockets 35 are fitted with the same chain 10. After the servo motor 8 is started, the output shaft of the servo motor 8 drives the rotating shaft I13 to rotate through the synchronous pulley I and the synchronous belt I. The rotating shaft I13 drives the rotating shaft II12 to rotate through the synchronous belt II and the synchronous pulley II. The rotating shaft II12 drives the mounting shaft II17 to rotate through the gear II24 and the gear I23. The rotating shaft II12 drives the mounting shaft I11 to rotate through the chain 10 and the sprocket 35, thereby providing power to the crushing blade I18 and the crushing blade II22, realizing the synchronous operation of the crushing component and the mixing component.

[0029] A sealing sleeve made of rubber is fitted at the rotational connection between mounting shaft I11 and sliding limit plate 20 to prevent soil dust from entering the connection; a rubber sealing sleeve is also fitted at the rotational connection between mounting shaft II17 and mounting bracket 16 to prevent dust corrosion and ensure smooth rotation of mounting shaft I11 and mounting shaft II17.

[0030] Furthermore, a protective cover II9 is ​​fixedly installed on one side of the frame 1 to protect the gear II24, synchronous pulley II, and synchronous pulley I. A protective cover I2 is fixedly installed on the other side of the frame 1 to protect the sprocket 35 and chain 10. Preferably, both protective covers I2 and II9 are made of stainless steel, which can effectively block soil dust from corroding the power transmission components and extend the service life of the components. A sealing door 7 is rotatably connected to one side of the frame 1. A fixing ring 6 is fixedly connected to the top of the sealing door 7. A rotating hook 5 is rotatably connected to one side of the upper cover 4. The rotating hook 5 works with the fixing ring 6 to fix the sealing door 7. The sealing door 7 is used to seal the openings on one side of the upper cover 4 and the lower guide cover 15. When the device is running, the rotating hook 5 is hung on the fixing ring 6 from the side to ensure that the sealing door 7 cannot be opened and to prevent soil leakage. Based on this, the entire device realizes the integrated operation of soil crushing, reagent mixing, and magnetic adsorption separation, ensuring continuous and efficient remediation process.

[0031] Both protective covers I2 and II9 are made of stainless steel, which can prevent soil dust from corroding the power transmission components and extend the service life of the components. This device needs to be opened regularly to clean and lubricate the sprocket 35, chain 10, gear I23, and gear II24, and to regularly check the tightness of timing belt I and timing belt II, and adjust or replace them in time to ensure stable power transmission.

[0032] This application can be used in the field of soil pollution, or in other fields applicable to this application.

[0033] In another embodiment: Reference Figure 1-11 A cadmium-contaminated soil remediation device is used in the field of soil pollution. The structure of this embodiment is basically the same as that of the previous embodiment, except that the number of crushing blades I 18 and II 22 can be adjusted according to the actual remediation needs. At the same time, the tilt angle of the mounting inclined plate 31 can be adjusted so that the remediation agent can be mixed more evenly with the soil. Preferably, the liquid inlet pipe 27 is made of corrosion-resistant material to avoid corrosion of the pipe by the remediation agent and extend the service life of the liquid inlet pipe 27. Specifically, the liquid inlet pipe 27 is connected to the connecting plate II 28 by a flange, which facilitates subsequent disassembly and maintenance. During the operation of the device, the crushed soil is repeatedly turned over by the stirring component and fully mixed with the agent sprayed by the remediation component. After the cadmium ions are fully washed away, they are adsorbed by magnetic biochar and then separated by the adsorption of neodymium iron boron permanent magnet 34. Finally, the soil after remediation meets the standards is obtained. It is expected to effectively improve the cadmium ion washing efficiency, ensure the remediation effect, and realize continuous operation to improve the remediation efficiency. It also includes a PLC controller bolted inside the frame 1. The PLC controller is electrically connected to the servo motor 8 and is used to control the start, stop, speed adjustment and forward and reverse rotation of the servo motor 8.

[0034] However, as is well known to those skilled in the art, the working principle and wiring method of the servo motor 8 are conventional means or common knowledge, and will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0035] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for remediating cadmium-contaminated soil, characterized in that, The machine includes a frame (1), a lower guide cover (15) is bolted to one side of the top of the frame (1), a bottom inclined plate (21) is integrally formed on one side of the lower guide cover (15), an upper cover (4) is bolted to the top of the lower guide cover (15), the upper cover (4) and the lower guide cover (15) are open on the side away from the bottom inclined plate (21), a feed hopper (3) is bolted to one side of the top of the frame (1), and one end of the feed hopper (3) is welded to one end of the bottom inclined plate (21); The upper cover (4) and the lower guide cover (15) are bolted to the side of the bottom inclined plate (21) with a mounting bracket (16). The mounting bracket (16) is equipped with a crushing component. The upper cover (4) has a rotating shaft I (13) that passes through it. The outer wall of the rotating shaft I (13) is equipped with a stirring component. The soil falls into the bottom inclined plate (21) through the feed hopper (3) and is guided by the bottom inclined plate (21) to the mounting bracket (16). After being crushed by the crushing component, it enters the chamber formed by the upper cover (4) and the lower guide cover (15).

2. The remediation device for cadmium-contaminated soil according to claim 1, characterized in that, The crushing assembly includes a rotating mounting shaft II (17) that passes through the mounting frame (16). The mounting frame (16) has strip-shaped notches (19) on both sides. A sliding limiting plate (20) is slidably connected in the strip-shaped notch (19). The sliding limiting plate (20) is fixedly connected to the mounting frame (16) by bolts. The two sliding limiting plates (20) are rotatably connected by the same mounting shaft I (11). Multiple crushing blades I (18) are fixedly bolted on the outer wall of the mounting shaft I (11). Multiple crushing blades II (22) are fixedly sleeved on the outer wall of the mounting shaft II (17). The mounting shaft I (11) and the mounting shaft II (17) rotate synchronously, driving the crushing blades I (18) and the crushing blades II (22) to shear and crush the soil. The sliding limiting plate (20) can slide along the strip-shaped notch (19) to adjust the distance between the mounting shaft I (11) and the mounting shaft II (17).

3. The remediation device for cadmium-contaminated soil according to claim 2, characterized in that, The upper protective cover (4) and the lower guide cover (15) are bolted with two symmetrically arranged fixed arc plates (14). The two fixed arc plates (14) are integrally formed with arc baffles (29) on the side close to each other. The mixing assembly includes two symmetrical connecting plates (26) bolted to the outer wall of the rotating shaft I (13). Both ends of the connecting plates I (26) are bolted with push plates (25). The two push plates (25) are centrally symmetrically arranged. The push plates (25) are L-shaped, and the two sides of the push plates (25) abut against the arc baffles (29) and the fixed arc plates (14) respectively. The rotating shaft I (13) rotates and drives the connecting plates I (26) and the push plates (25) to rotate. The push plates (25) scoop up the soil, and the arc baffles (29) and the fixed arc plates (14) prevent the soil from falling off.

4. The remediation device for cadmium-contaminated soil according to claim 3, characterized in that, The two arc-shaped baffles (29) are bolted together by the same connecting plate II (28). The bottom of the connecting plate II (28) is provided with a repair assembly, which includes multiple mounting inclined plates (31) bolted to the bottom of the connecting plate II (28). One side of the mounting inclined plate (31) is provided with a mounting groove (33), and a neodymium iron boron permanent magnet (34) is fixedly embedded in the mounting groove (33). One side of the mounting inclined plate (31) is provided with multiple interconnected liquid outlet holes (32), and the top of the mounting inclined plate (31) is provided with a liquid inlet that is connected to the liquid outlet holes (32). The bottom of the connecting plate II (28) is provided with multiple round holes that communicate with the liquid inlet (30). The top of the connecting plate II (28) is welded and fixed with a liquid inlet pipe (27). The top of the liquid inlet pipe (27) extends to the outside of the upper cover (4). The high-pressure repair agent enters the mounting inclined plate (31) through the liquid inlet pipe (27), the round holes of the connecting plate II (28) and the liquid inlet (30), and is sprayed out from the liquid outlet (32) to mix with the soil. The neodymium iron boron permanent magnet (34) generates a strong magnetic field, which adsorbs and locks the magnetic biochar that adsorbs cadmium ions in the mounting groove (33).

5. The remediation device for cadmium-contaminated soil according to claim 4, characterized in that, The frame (1) is bolted with a drive assembly, which includes a servo motor (8) bolted to the top of the frame (1). The outer walls of the servo motor (8) and the shaft I (13) are both fitted with synchronous pulleys I. The outer walls of the two synchronous pulleys I are fitted with the same synchronous belt I. The outer walls of the shaft I (13) and the shaft II (12) are both fitted with synchronous pulleys II. The outer walls of the two synchronous pulleys II are fitted with the same synchronous belt II. The servo motor (8) drives the shaft I (13) to rotate through the synchronous pulleys I and the synchronous belt I. The shaft I (13) drives the shaft II (12) to rotate through the synchronous pulleys II and the synchronous belt II.

6. The remediation device for cadmium-contaminated soil according to claim 5, characterized in that, Gear I (23) is fixedly sleeved on the outside of the mounting shaft II (17), and gear II (24) is fixedly sleeved on the outer wall of the rotating shaft II (12). Gear I (23) and gear II (24) mesh and drive each other. Sprockets (35) are fixedly sleeved on the outer wall of the rotating shaft II (12) and the outer wall of the mounting shaft I (11). The same chain (10) is sleeved on the outer wall of the two sprockets (35). The rotating shaft II (12) drives the mounting shaft II (17) to rotate through the meshing of gear I (23) and gear II (24), and drives the mounting shaft I (11) to rotate through the sprockets (35) and the chain (10).

7. The remediation device for cadmium-contaminated soil according to claim 6, characterized in that, The frame (1) is bolted to one side with a protective cover II (9), which is used to protect gear II (24), synchronous pulley II and synchronous pulley I. The frame (1) is bolted to the other side with a protective cover I (2), which is used to protect sprocket (35) and chain (10). Both protective cover I (2) and protective cover II (9) are made of stainless steel.

8. The remediation device for cadmium-contaminated soil according to claim 1, characterized in that, A sealing cover (7) is hinged to one side of the frame (1), and a fixing ring (6) is welded and fixed to the top of the sealing cover (7). A rotating hook (5) is hinged to one side of the upper cover (4), and the rotating hook (5) cooperates with the fixing ring (6) to fix the sealing cover (7).

9. The remediation device for cadmium-contaminated soil according to claim 8, characterized in that, The sealing door (7) is used to block the openings on one side of the upper protective cover (4) and the lower guide cover (15). When the device is running, the rotating hook (5) is attached to the fixing ring (6).

10. A method for remediating cadmium-contaminated soil, characterized in that, A remediation apparatus for cadmium-contaminated soil according to any one of claims 1 to 9, comprising the following steps: S1. The contaminated soil is fed into the feed hopper (3) and guided by the bottom inclined plate (21) to the space between the two mounting frames (16); S2. Start the servo motor (8), drive the crushing component and the mixing component to run through the drive component. The crushing blade I (18) and the crushing blade II (22) crush the soil. The push plate (25) drives the soil to turn over repeatedly to achieve secondary crushing. S3. The high-pressure remediation agent is sent in through the inlet pipe (27), and enters the installation inclined plate (31) through the connecting plate II (28) and the inlet (30). It is sprayed out from the outlet hole (32) to mix with the soil and wash away cadmium ions in the soil. S4, the neodymium iron boron permanent magnet (34) generates a strong magnetic field, which adsorbs and locks the magnetic biochar that adsorbs cadmium ions in the installation groove (33), thereby realizing the separation of the adsorbent material from the soil slurry. S5. After the remediation is completed, open the sealed cover door (7), take out the soil that has been remediated to meet the standards, and complete the remediation of cadmium-contaminated soil.

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