An experimental device for heavy metal adsorption

Abstract

The application belongs to the technical field of contaminated soil remediation, and specifically discloses an experimental device for heavy metal adsorption, which comprises a base, an experimental bin, a position limiting part and a water flow part, and the base is provided with a bearing slide rail. The experimental bin comprises a plurality of experimental disc bodies which are sequentially distributed, and a transfer window is formed in the side surface of each of the adjacent two experimental disc bodies. The experimental disc bodies are slidably arranged on the bearing slide rail, and the experimental disc bodies are used for placing soil or adsorbents. The experimental disc body for placing the adsorbents is adjacent to the experimental disc body for placing the soil, and the water flow part is used for providing water for the heavy metal contaminated soil. The modular dynamic experimental platform is used for freely arranging and combining the plurality of experimental disc bodies, the soil and the adsorbents are placed adjacently, the contact mode of the adsorbent and the soil in the actual pollution scene is simulated, the process of the diatomite blocking the migration of the heavy metal in the soil can be simulated, diversified research scenes are compatible, and the experimental device is suitable for laboratory mechanism research and engineering application test.

Description

Technical Field

[0001] This invention belongs to the field of contaminated soil remediation technology, and specifically relates to an experimental device for heavy metal adsorption. Background Technology

[0002] Diatomaceous earth is a natural siliceous mineral formed from the sediment of ancient diatoms. Its main component is amorphous silicon dioxide (SiO2), and it has a porous structure and a high specific surface area (typically 10-60 m²). 2 Diatomaceous earth possesses properties such as being rich in silanol groups (-SiOH) on its surface. The adsorption mechanism of heavy metals by diatomaceous earth mainly includes physical adsorption and chemical adsorption: 1) Physical adsorption, relying on the pore retention effect of its porous structure and surface electrostatic attraction, attracts heavy metal ions (such as Pb). 2+ Cd 2+ As 3+ 1) Enrichment by means of surface silanol groups; 2) Chemisorption, through which surface silanol groups undergo ion exchange, complexation or chelation reactions with heavy metal ions to form a stable chemical bond state, and even through modification (such as acid treatment, loading metal oxides, etc.) to introduce new adsorption sites (such as Fe-OH, Mn-O groups, etc.), the selective adsorption capacity for specific heavy metals is significantly improved.

[0003] Several experimental studies have been conducted to verify the adsorption capacity of diatomaceous earth and its related adsorbents for heavy metals. For example, the team at Southwest University used microwave and ultrasonic combined acidification to modify diatomaceous earth and found that its adsorption capacity for three heavy metals was significantly improved: Pb 2+ (153.2 mg / g), Cu 2+ (118.7 mg / g), Cd 2+(92.5 mg / g). The adsorption effect increased with increasing pH (2-6), temperature (25-45℃), and adsorbent dosage (1-5 g / L). The isothermal adsorption conformed to the Langmuir model, indicating that monolayer chemisorption was dominant. This modification method effectively improved the affinity of diatomaceous earth for cationic heavy metals and is suitable for the remediation of acidic contaminated soil. For example, the team at Hunan University of Science and Technology combined acid / alkali modified diatomaceous earth with quicklime and hydroxyapatite for the remediation of non-ferrous metal tailings soil. The results showed that the mixed solidifying agent reduced the available Mn, Pb, and Zn in the soil by 46.32%, 47.93%, and 10.68%, respectively, and reduced the accumulation of heavy metals in plants by more than 50%. X-ray diffraction analysis showed that heavy metals were fixed through mechanisms such as ion exchange, surface complexation, and phosphate precipitation, significantly reducing their bioavailability. For example, a team from Chongqing Jiaotong University developed a "desert soilification" technology in mine restoration in Fuling District, combining diatomaceous earth with plant binders to transform waste slag into arable soil. Experiments showed that the concentration of heavy metal leaching in the improved soil decreased by 80%, the pH dropped from 10.2 to 7.8, and rice yield reached 636 kg / mu. This technology has cumulatively restored over 500 mu of mines, at a cost only one-quarter that of traditional topsoil methods.

[0004] Heavy metal migration in soil can occur through both spontaneous processes (such as diffusion) and processes dependent on water flow (such as mass flow). Specifically, heavy metal ions diffuse from high-concentration areas to low-concentration areas in soil pore water due to concentration gradients. This migration does not require macroscopic water flow and is a result of molecular thermal motion. Because the spontaneous migration rate is relatively slow, it mainly affects the distribution of heavy metals at the microscopic scale (such as between soil particles). However, when water flows in the soil (such as through rainfall, irrigation, or groundwater movement), heavy metal ions dissolved in the water migrate along with the water flow. This process depends on the macroscopic movement of water and has a faster migration rate, affecting the distribution of heavy metals at a larger spatial scale (such as from surface soil to deeper layers or water bodies). If diatomaceous earth is used to adsorb migrating heavy metals, it can effectively block their migration and achieve remediation. Currently, this process is in the theoretical stage, therefore, an experimental device is urgently needed to verify the effectiveness of diatomaceous earth in blocking and remediating the migration of heavy metals in soil. Summary of the Invention

[0005] To address the aforementioned problems, the purpose of this invention is to provide an experimental device for heavy metal adsorption, which can verify the blocking and control effect of diatomaceous earth on the migration process of heavy metals in soil.

[0006] The technical solution of the present invention is: an experimental device for heavy metal adsorption, comprising a base, an experimental chamber, a position limiting part, and a moisture flow part.

[0007] The base has a support rail, and the experimental chamber includes multiple experimental trays arranged sequentially. Transfer windows are provided on the sides where adjacent trays contact each other. The experimental trays are slidably mounted on the support rail and are used to hold soil or adsorbents. The trays holding adsorbents are adjacent to the trays holding soil. The positioning limiting part includes a screw and connecting block assemblies. The screw is rotatably mounted on the base, and a motor connected to the screw is located inside the base to drive the screw's rotation. Multiple connecting block assemblies are threaded onto the screw, and each assembly corresponds to and is movably connected to one of the experimental trays. The moisture flow part includes a water storage component and a spray plate. The water storage component stores water, and the spray plate, located within the experimental tray containing heavy metal-contaminated soil, is connected to the water storage component and provides moisture to the heavy metal-contaminated soil.

[0008] The modular dynamic experimental platform allows for flexible combination of experiments based on actual needs. Multiple experimental trays can be freely arranged and combined to achieve adjacent placement of soil and adsorbents, simulating the contact pattern between adsorbent and soil in real-world pollution scenarios, effectively improving the universality of the experiment. A transfer window is used to realize ion migration between soil and adsorbents during the experiment.

[0009] Furthermore, the experimental disc includes a first disc and a second disc. The first disc has a first placement cavity for placing soil. The second disc has a second placement cavity for placing adsorbents. Using different experimental discs to separate the soil and adsorbents facilitates identification in actual use, allows for rapid dispensing, and reduces operation time. Additionally, since the required amounts of soil and adsorbents differ in the experiment—that is, the width of the soil required is much larger than the width of the adsorbent—using experimental discs of the same size would result in an excess of adsorbents beyond the required amount of soil, leading to significant waste. Therefore, using different sizes of experimental discs, namely the first and second discs, to separate the soil and adsorbents effectively avoids experimental waste. In actual use, selecting the appropriate disc based on the experimental purpose improves experimental efficiency and ensures data reliability. Further optimization can be achieved by refining the dispensing scheme according to specific experimental conditions.

[0010] Furthermore, both the first placement cavity and the second placement cavity are cuboid structures, with the same length and height, and the ratio between the width of the first placement cavity and the width of the second placement cavity is 5 to 15:1.

[0011] Furthermore, a transverse groove is provided at the upper end of the first placement cavity along its length, and the spray plate, being a strip-shaped structure, is fitted inside the transverse groove. The strip-shaped structure fitting into the transverse groove achieves full-coverage water supply to the soil surface, simulating natural rainfall or irrigation conditions. The transverse groove extends along the length of the first placement cavity, and the spray plate, after fitting, forms a continuous strip-shaped structure, allowing for uniform water distribution along the entire length of the soil surface, avoiding localized drought or waterlogging, and simulating the uniformity of natural rainfall. The groove design of the transverse groove restricts the displacement of the spray plate, preventing positional shifts caused by water flow impact or external force, ensuring water supply stability. Moreover, by replacing spray plates with different orifice diameters or water density, the water supply or droplet size can be flexibly adjusted to meet different experimental scenarios such as soil infiltration and leaching.

[0012] Furthermore, the water flow section also includes a distribution section, which comprises a main pipe, distribution connectors, and branch pipes. The main pipe is mounted on the base and connected to the water storage unit via a pump body. Multiple distribution connectors are sequentially mounted on the main pipe, and each connector is equipped with a valve. One end of the branch pipe connects to the distribution connector, and the other end connects to the spray tray. The branch pipe and valve design allow for individual control of the water supply to each spray tray, meeting the varying humidity requirements of different experiments.

[0013] Furthermore, a sealing strip is provided around the perimeter of the transfer window to improve the sealing effect and prevent inaccurate experiments caused by leakage when moisture flows through the transfer window.

[0014] Furthermore, the connecting block assembly includes a movable nut, a connecting block, and a limiting rod.

[0015] The movable nut is threaded onto the drive screw. A connecting block is sleeved on the outside of the movable nut and rotatably connected to it. A snap-fit ​​block is provided on the experimental disc, and the connecting block and the snap-fit ​​block are snapped together by a locking block. One end of a limit rod is mounted on the connecting block, and the other end is movably mounted on the movable nut, used to lock the movable nut. When the limit rod locks the movable nut, the screw rotates, causing the movable nut to move, which in turn causes the experimental disc, snapped onto the connecting block, to move.

[0016] Furthermore, the transfer window is provided with a grid.

[0017] The sealing strip and the mesh work together to prevent leakage and control the ion migration rate between the soil and the adsorbent through the mesh, avoiding the problems of "over-mixing" or "insufficient contact" in traditional experiments.

[0018] Furthermore, it also includes a compaction section for compacting heavy metal contaminated soil.

[0019] Furthermore, the compaction section includes a guide rail, a mounting frame, a telescopic component, and a pressure plate. The guide rail is mounted on the base, the mounting frame is slidably mounted on the guide rail along its length, the telescopic component is mounted on the mounting frame, and the pressure plate is mounted on the telescopic end of the telescopic component. When the telescopic component extends, the pressure plate is used to compact the heavy metal contaminated soil inside the experimental tray.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] This invention employs a modular dynamic experimental platform that allows multiple experimental discs to be freely arranged and combined, enabling adjacent placement of soil and adsorbents. This simulates the contact pattern between adsorbents and soil in actual pollution scenarios, and can simulate the blocking and treatment of heavy metal migration processes in soil by diatomaceous earth. It is compatible with diverse research scenarios and is suitable for laboratory mechanism research and engineering application testing.

[0022] After adjusting the experimental disk according to the needs of the actual research scenario, the position limiting part can be used to effectively limit the experimental disk to ensure that the adjacent experimental disks form a directional migration channel based on the transfer window, thereby further verifying the migration process. The position limiting part can ensure the installation stability of each experimental disk.

[0023] The water flow section utilizes a microporous spray system to achieve full-coverage water supply on the soil surface, simulating natural precipitation or irrigation conditions. Based on this, the study investigates the blocking and control effect of diatomaceous earth on heavy metal migration in the soil under macroscopic water flow. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the first disc body of the present invention;

[0026] Figure 3 This is an exploded view of the structure of the second disc body of the present invention;

[0027] Figure 4 This is the present invention. Figure 1 Enlarged view of point A in the middle;

[0028] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0029] Among them, 1-base, 10-bearing slide rail, 2-experimental chamber, 20-experimental disc, 200-transfer window, 21-first disc, 210-first placement cavity, 2100-transverse groove, 22-second disc, 220-second placement cavity, 3-position limiting part, 31-screw, 32-connecting block group, 321-moving nut, 322-connecting block, 323-limiting rod, 4-water flow part, 40-spray disc, 41-main pipe, 42-liquid separator connector, 43-branch pipe, 5-compacting part, 51-guide rail, 52-mounting bracket, 53-telescopic component, 54-pressure plate. Detailed Implementation

[0030] The following is combined with Figures 1 to 5 The specific embodiments of the present invention will be described in detail below. In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0032] It should be noted that the circuit connections involved in this invention all adopt conventional circuit connection methods and do not involve any innovation.

[0033] Example 1

[0034] like Figure 1 An experimental apparatus for heavy metal adsorption is shown, comprising a base 1, an experimental chamber 2, a position limiting part 3, and a moisture flow part 4. The base 1 has a support slide rail 10.

[0035] Experimental chamber 2 includes multiple experimental discs 20 arranged in sequence. Transfer windows 200 are provided on the sides of adjacent experimental discs 20 that are in contact. The experimental discs 20 are slidably mounted on the support rail 10. The experimental discs 20 are used to place soil or adsorbents. The experimental discs 20 for placing adsorbents are adjacent to the experimental discs 20 for placing soil. The soil is ordinary soil or heavy metal contaminated soil, and the adsorbent is diatomaceous earth adsorbent.

[0036] The position limiting part 3 includes a screw 31 and connecting block assembly 32. The screw 31 is rotatably mounted on the base 1, and a motor connected to the screw 31 is installed inside the base 1. The motor drives the screw 31 to rotate. There are multiple connecting block assemblies 32, all threaded onto the screw 31. Each of the multiple connecting block assemblies 32 corresponds to and is movably connected to the experimental tray 20. The moisture flow part 4 includes a water storage component and a spray tray 40. The water storage component stores water, and the spray tray 40 is installed inside the experimental tray 20, which is used to hold heavy metal contaminated soil, and is connected to the water storage component to provide moisture to the heavy metal contaminated soil.

[0037] like Figure 1 As shown, base 1 is an experimental platform with a concave cross-section. The two sides and bottom of the concave structure of base 1 are hollow to facilitate the placement of other components.

[0038] There are two bearing slide rails 10, which are mounted side by side in the concave structure of the base 1. There are two screws 31, which span between the two sides of the concave structure of the base 1 and are located above the bearing slide rails 10. The bearing slide rails 10 and the screws 31 are parallel. The position limiting part 3 and the bearing slide rails 10 form a bearing limiting structure. The two bearing slide rails 10 are used to support the bottom of the experimental plate 20. The two screws 31 are used to limit the two opposite sides of the experimental plate 20 that contact the transfer window 200. The experimental plate 20 is fixed by the connecting block group 32, so that the experimental plate 20 can be stably placed in the space formed by the two bearing slide rails 10 and the two screws 31 and move on the bearing slide rails 10 with the connecting block group 32.

[0039] This embodiment employs a modular dynamic experimental platform that allows for flexible combination of experiments according to actual needs. Multiple experimental trays 20 can be freely arranged and combined to achieve adjacent placement of soil and adsorbent, simulating the contact pattern between adsorbent and soil in real-world pollution scenarios, effectively improving the experimental versatility. A transfer window 200 is used to realize ion migration between soil and adsorbent during the experiment.

[0040] When in use, soil or adsorbents can be selectively placed inside the experimental tray 20 to simulate modular dynamic experiments.

[0041] For example, five experimental discs 20 were used in the experiment. From left to right, the experimental discs 20 were experimental disc one, experimental disc two, experimental disc three, experimental disc four, and experimental disc five. Heavy metal contaminated soil was placed in experimental disc three, ordinary soil was placed in experimental disc one and experimental disc four, and adsorbents were placed in experimental disc two and experimental disc five.

[0042] In this embodiment, the heavy metal contaminated soil contains Pb. 2+ Zn 2+ The heavy metal contaminated soil, specifically through Pb(NO3)2 Zn(NO3) 2 ·6H2O to prepare Pb at a concentration of 1000 mg / L 2+ Zn 2+ The solution is diluted and then mixed evenly with ordinary soil. It should be noted that heavy metal contaminated soil can also be prepared using other heavy metal contaminated soils, depending on the specific requirements.

[0043] In this embodiment, the adsorbent is diatomaceous earth adsorbent, specifically refined diatomaceous earth obtained by refining diatomaceous earth. It should be noted that modified diatomaceous earth can also be used as the adsorbent, and it can be selectively prepared according to requirements.

[0044] During the experiment, the water flow section 4 simulated natural precipitation or irrigation environment within experimental disc three. Subsequently, samples were periodically collected from experimental discs one, two, three, four, and five. The mass concentration of heavy metal ions in the samples from different experimental discs was calculated using flame atomic absorption spectrophotometry. By comparing the mass concentrations of heavy metal ions in the samples from different experimental discs, the blocking and control effect of diatomaceous earth on heavy metal migration in soil under macroscopic water flow was evaluated, as shown in Table 1.

[0045] Table 1. Evaluation Table of the Interception and Control Effect of Diatomaceous Earth on Heavy Metal Migration in Soil under Macroscopic Water Flow

[0046]

[0047] It should be noted that during sampling, the sample should be taken from the center between the two opposite sides of the transfer window 200 on the experimental disc 20, and the sampling tube should be inserted vertically from the top of the experimental disc 20. Avoid sampling directly against the transfer window 200, as the soil or adsorbents near the transfer window 200 will move with moisture, and this movement should be avoided to prevent interference with the experimental data.

[0048] In addition, a sealing plate is installed on the transfer window 200 exposed at the end of the experimental disc 20, that is, on the transfer window 200 on the left side of the experimental disc 1 and on the transfer window 200 on the right side of the experimental disc 5, in order to seal the experimental chamber 2 and prevent heavy metal pollutants from leaking out.

[0049] Preferred, such as Figure 2 , Figure 3 As shown, the experimental disk 20 includes a first disk 21 and a second disk 22. Figure 2 As shown, the first disc 21 has a first placement cavity 210, which is used to place soil. Figure 3As shown, the second disc 22 has a second placement cavity 220 for placing the adsorbent. Using different experimental discs 20 to separate the soil and adsorbent facilitates identification in practical use, allows for rapid dispensing, and reduces operation time. Furthermore, since the required amounts of soil and adsorbent differ in experiments (i.e., the width of the soil required is much greater than the width of the adsorbent), using experimental discs 20 of the same size would result in an excess of adsorbent over the required amount of soil, leading to significant waste. Therefore, using experimental discs 20 of different sizes—the first disc 21 and the second disc 22—to separate the soil and adsorbent effectively avoids experimental waste. In practical use, selecting the appropriate disc based on the experimental purpose improves experimental efficiency and ensures data reliability. Further optimization can be achieved by refining the dispensing scheme based on specific experimental conditions such as humidity and detection methods. It should be noted that both the first placement cavity 210 and the second placement cavity 220 have openings at the top, and the opening of the second placement cavity 220 is secured with a cap.

[0050] Preferably, both the first placement cavity 210 and the second placement cavity 220 are cuboid structures, and the length and height of the first placement cavity 210 and the second placement cavity 220 are the same. The ratio between the width of the first placement cavity 210 and the width of the second placement cavity 220 is 5 to 15:1.

[0051] Preferably, a transverse groove 2100 is provided at the upper end of the first placement cavity 210 along its length, and the spray plate 40 is a strip-shaped structure that is fitted inside the transverse groove 2100. The strip-shaped structure is fitted into the transverse groove 2100 to achieve full coverage water supply to the soil surface, simulating natural rainfall or irrigation conditions. The transverse groove extends along the length of the first placement cavity 210, and the spray plate, after being fitted, forms a continuous strip-shaped structure, which can evenly distribute water along the entire length of the soil surface, avoiding local drought or water accumulation, and simulating the uniformity of natural rainfall. The slot design of the transverse groove 2100 can limit the displacement of the spray plate, preventing positional shifts caused by water flow impact or external force, and ensuring water supply stability. Furthermore, by replacing the spray plate with different orifice diameters or water density, the water supply or droplet size can be flexibly adjusted to meet different experimental scenarios such as soil infiltration and leaching.

[0052] Preferably, the water flow section 4 further includes a liquid distribution section, which includes a main pipe 41, a liquid distribution connector 42, and a branch pipe 43. The main pipe 41 is mounted on the base 1 and is connected to the water storage device via a pump body. Multiple liquid distribution connectors 42 are sequentially mounted on the main pipe 41, and each connector 42 is equipped with a valve. One end of the branch pipe 43 is connected to the liquid distribution connector 42, and the other end is connected to the spray plate 40.

[0053] Preferably, a sealing strip is provided around the perimeter of the transfer window 200.

[0054] Preferred, such as Figure 4 As shown, the connecting block assembly 32 includes a movable nut 321, a connecting block 322, and a limiting rod 323. The movable nut 321 is threaded onto the drive screw 31. The connecting block 322 is sleeved on the outside of the movable nut 321 and is rotatably connected to it. The experimental disc 20 is provided with a locking block, and the connecting block 322 is locked to the locking block by a locking block. One end of the limiting rod 323 is provided on the connecting block 322, and the other end is movably provided on the movable nut 321, used to lock the movable nut 321. When the limiting rod 323 locks the movable nut 321, the screw 31 rotates and drives the movable nut 321 to move, thereby driving the experimental disc 20 locked on the connecting block 322 to move.

[0055] Preferably, the transfer window 200 is provided with a grid. The grid can effectively block solid soil and adsorbents, preventing water from carrying soil or adsorbents when passing through the transfer window 200, which could lead to inaccurate experimental data. The sealing strip works in conjunction with the grid to prevent leakage and control the ion migration rate between the soil and the adsorbent through the grid, avoiding the problems of "over-mixing" or "insufficient contact" in traditional experiments.

[0056] Example 2

[0057] Unlike Example 1, as follows: Figure 5 As shown, an experimental apparatus for heavy metal adsorption also includes a compaction section 5, which is used to compact heavy metal contaminated soil.

[0058] Preferably, the compaction section 5 includes a guide rail 51, a mounting frame 52, a telescopic member 53, and a pressure plate 54. The guide rail 51 is mounted on the base 1, the mounting frame 52 is slidably mounted on the guide rail 51 along its length, the telescopic member 53 is mounted on the mounting frame 52, and the pressure plate 54 is mounted on the telescopic end of the telescopic member 53. When the telescopic member 53 extends, the pressure plate 54 is used to compact the heavy metal contaminated soil inside the experimental tray 20.

[0059] In practical applications, compaction section 5 is used to compact heavy metal-contaminated soil within experimental disc 20, resulting in a more compact soil particle arrangement and reduced pore volume. For example, after compaction, the porosity of sandy soil can decrease from 40% to 25%, and that of clay from 50% to 35%. Furthermore, the pore types within the soil change: macropores (>50μm) decrease, micropores (<5μm) relatively increase, and the proportion of capillary pores rises. Therefore, by compacting the soil pores during the experiment, the content of pore water in the soil can be altered, thereby verifying the spontaneous migration process of heavy metals under different soil porosity conditions. During the experiment, soil compaction can also accelerate the flow of water within the soil, i.e., squeezing the soil forces water through transfer window 200.

[0060] The specific models of the above electronic components are not specifically specified; any commercially available ordinary products can be selected, as long as they can meet the usage requirements of this invention.

[0061] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and do not limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. An experimental apparatus for the adsorption of heavy metals, characterized in that, include: The base (1) has a load-bearing slide rail (10); The experimental chamber (2) includes multiple experimental discs (20) arranged in sequence. A transfer window (200) is provided on the side where two adjacent experimental discs (20) are in contact. The experimental discs (20) are slidably set on the bearing slide rail (10). The experimental discs (20) are used to place soil or adsorbents. The experimental disc (20) for placing adsorbents is adjacent to the experimental disc (20) for placing soil. The position limiting part (3) includes: a screw (31) rotatably mounted on the base (1), and a motor connected to the screw (31) is provided inside the base (1), the motor being used to drive the screw (31) to rotate; and multiple connecting block groups (32), all threaded onto the screw (31), with each of the multiple connecting block groups (32) corresponding to and movably connected to the experimental disc (20). The water flow section (4) includes: a water storage component for storing water; and a spray plate (40) installed inside the experimental plate (20) for placing heavy metal contaminated soil, connected to the water storage component, for supplying water to the heavy metal contaminated soil. The base (1) is an experimental platform with a concave cross section. Both sides and the bottom of the concave structure of the base (1) are hollow. There are two bearing slide rails (10), which are mounted side by side in the concave structure of the base (1). There are two screws (31), which are straddled between the two sides of the concave structure of the base (1) and located above the bearing slide rails (10). The bearing slide rails (10) and screws (31) are parallel.

2. The experimental apparatus for heavy metal adsorption as described in claim 1, characterized in that, The experimental disk body (20) includes: The first disc (21) has a first placement cavity (210) for placing soil; The second disc (22) has a second placement cavity (220) for placing the adsorbent.

3. The experimental apparatus for heavy metal adsorption as described in claim 2, characterized in that, Both the first placement cavity (210) and the second placement cavity (220) are cuboid structures. The length and height of the first placement cavity (210) and the second placement cavity (220) are the same. The ratio between the width of the first placement cavity (210) and the width of the second placement cavity (220) is 5 to 15:

1.

4. The experimental apparatus for heavy metal adsorption as described in claim 2, characterized in that, The upper end of the first placement cavity (210) is provided with a transverse groove (2100) along the length direction of the first placement cavity (210), and the spray plate (40) is a strip structure and is installed inside the transverse groove (2100).

5. The experimental apparatus for heavy metal adsorption as described in claim 3, characterized in that, The water flow section (4) further includes a liquid separation section, which includes: The main pipe (41) is set on the base (1), and the main pipe (41) is connected to the water storage device through the pump body; There are multiple liquid separators (42), and multiple liquid separators (42) are arranged sequentially on the main pipe (41). Valves are provided on the liquid separators (42). The branch pipe (43) is connected at one end to the liquid separator (42) and at the other end to the spray plate (40).

6. The experimental apparatus for heavy metal adsorption as described in claim 1, characterized in that, A sealing strip is provided around the periphery of the transfer window (200).

7. The experimental apparatus for heavy metal adsorption as described in claim 1, characterized in that, The connecting block group (32) includes: The movable nut (321) is threaded onto the drive screw (31); The connecting block (322) is sleeved on the outside of the movable nut (321) and is rotatably connected to the movable nut (321); the experimental disc body (20) is provided with a snap-fit ​​block, and the connecting block (322) and the snap-fit ​​block are snapped together by a locking block; The limiting rod (323) is set on the connecting block (322) at one end and movably set on the movable nut (321) at the other end, and is used to lock the movable nut (321). When the limiting rod (323) locks the movable nut (321), the screw (31) rotates and drives the movable nut (321) to move, thereby driving the experimental disc (20) that is stuck on the connecting block (322) to move.

8. The experimental apparatus for heavy metal adsorption as described in claim 1, characterized in that, The transfer window (200) is provided with a grid.

9. The experimental apparatus for heavy metal adsorption as described in claim 1, characterized in that, It also includes a compaction section (5) for compacting heavy metal contaminated soil.

10. The experimental apparatus for heavy metal adsorption as described in claim 9, characterized in that, The compaction section (5) includes: Guide rail (51) is set on base (1); The mounting bracket (52) is slidably mounted on the guide rail (51) along the length of the guide rail (51); The telescopic component (53) is mounted on the mounting bracket (52); The pressure plate (54) is set at the telescopic end of the telescopic component (53). When the telescopic component (53) extends, the pressure plate (54) is used to compact the heavy metal contaminated soil in the experimental disc (20).

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