Staged remediation system for heavy metal soil

Abstract

The invention relates to the technical field of soil remediation, and discloses a heavy metal soil staged remediation system which comprises a bottom frame, the interior of the bottom frame is rotationally connected with a thermal desorption bin, the interior of the thermal desorption bin is provided with a one-way bin, one side of the outer wall of the one-way bin communicates with a sealed feeding pipeline, and the sealed feeding pipeline is used for conveying unremediated soil into the one-way bin; a material conveying channel is formed in the other end of the one-way bin and used for conveying repaired soil, one end of the one-way bin communicates with a gas pipeline and used for manufacturing a high-temperature environment in the thermal stripping bin, one side of the outer wall of the one-way bin communicates with an exhaust pipeline, and one end of the exhaust pipeline communicates with a purification mechanism. The device is used for removing heavy metal contained in burning gas. And the auxiliary mechanism is used for carrying out auxiliary thermal desorption on the soil through recovered and purified tail gas waste heat, so that the heavy metal removal efficiency is further improved, the soil can reach the remediation standard more quickly, the remediation time is shortened, and the remediation cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation, and in particular to a heavy metal soil staged remediation system. Background Art

[0002] In today's era of accelerated industrialization, numerous industrial activities such as metal smelting, chemical production, electronic waste treatment, and irrational application of fertilizers and pesticides in the agricultural field have caused a large amount of heavy metal pollutants to enter the soil environment. Thermal desorption technology, as an important physical remediation method, has attracted much attention in the field of heavy metal soil remediation. Its principle is to use high temperature to convert heavy metals in the soil from solid phase to gas phase, thereby achieving separation from the soil matrix. It can significantly reduce the heavy metal content in the soil in a relatively short period of time, and has the potential for rapid remediation of some heavily polluted soils.

[0003] However, the single thermal desorption process faces many severe challenges. In terms of tail gas pollution, heavy metals and organic matter in the soil volatilize into the tail gas at high temperatures during the thermal desorption process. If they are directly discharged without effective treatment, the high concentration of heavy metals contained in them will cause serious pollution to the atmospheric environment. After spreading to the surrounding areas, they may pollute the soil and water again through atmospheric deposition, forming a secondary pollution cycle. In addition, volatile organic compounds in tail gas will also have a negative impact on air quality, causing a series of environmental problems and health risks.

[0004] High energy consumption is also a key factor limiting the widespread application of thermal desorption technology. Thermal desorption requires heating the soil to a high temperature and maintaining it for a certain period of time. This process consumes a lot of energy, such as natural gas and electricity, which is not in line with the current environmental protection concept of energy conservation and emission reduction. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a heavy metal soil staged remediation system, which solves the problem of severe atmospheric pollution caused by thermal stripping tail gas and high energy consumption.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a heavy metal soil staged remediation system, including a base frame, the interior of the base frame is rotatably connected with a thermal decompression chamber, the interior of the thermal decompression chamber is provided with a one-way chamber, one side of the outer wall of the one-way chamber is connected with a sealed feed pipe, which is used to transport unrepaired soil into the one-way chamber, the other end of the one-way chamber is provided with a feed channel, which is used to transport remediated soil, one end of the one-way chamber is connected with a gas pipeline, which is used to create a high-temperature environment inside the thermal decompression chamber, one side of the outer wall of the one-way chamber is connected with an exhaust pipe, one end of the exhaust pipe is connected with a purification mechanism, which is used to remove heavy metals contained in the burning gas, the output end of the purification mechanism is connected with an auxiliary mechanism, the auxiliary mechanism slides inside the thermal decompression chamber, and is used to assist in thermal decompression of the soil inside the one-way chamber, the bottom of the thermal decompression chamber is installed with a tilting component, which is used to change the direction of the soil inside the one-way chamber, and the output end of the auxiliary mechanism is connected with a condensation mechanism, which is used to condense and purify the exhaust gas.

[0007] Preferably, the purification mechanism includes a purification chamber, an input end of the purification chamber is connected to one end of the exhaust pipe, an evenly distributed activated carbon layer is provided inside the exhaust pipe, one side of the outer wall of the purification chamber is connected to a gas pipeline, and the output end of the purification chamber is connected to one end of a return air pipe.

[0008] Preferably, the auxiliary mechanism includes a support rod, which is fixedly connected to one side of the inner wall of the one-way bin, and the outer wall of the support rod is slidably connected to the auxiliary heating bin, the outer wall of the auxiliary heating bin is connected to one end of a telescopic tube, the other end of the telescopic tube passes through the one-way bin and is connected to an annular tube, one end of the annular tube is connected to the other end of the return air pipe, and the other end of the annular tube is connected to an extension tube.

[0009] Preferably, the tilting assembly includes a swivel, which is rotatably connected to the outer wall of the heat release bin, one side of the outer wall of the swivel is rotatably connected to a rotating shaft, one side of the outer wall of the base frame is installed with a hydraulic rod, and the output end of the hydraulic rod is fixedly connected to the inside of the rotating shaft.

[0010] Preferably, a conveyor frame is fixedly connected to one side of the outer wall of the base frame, a U-shaped tube is laid inside the conveyor frame, a conveyor belt is installed inside the conveyor frame, and the conveyor belt is located directly below the material conveying channel.

[0011] Preferably, the condensation mechanism includes a condensation bin, which is fixedly connected to one side of the outer wall of the base frame, the input end of the condensation bin is connected to the extension pipe, the interior of the condensation bin is filled with condensate, the output end of the condensation bin is connected to one end of a condensation pipe, the condensation pipe is laid inside the conveyor belt, and the other end of the condensation pipe is connected to the U-shaped pipe.

[0012] Preferably, a through hole is opened on the outer wall of the auxiliary heating bin, a rolling ring is installed inside the through hole, and evenly distributed rollers are installed inside the rolling ring.

[0013] Preferably, the condensate is one of liquid nitrogen and ethylene glycol.

[0014] Preferably, the U-shaped tube is connected to a plurality of nozzles at equal intervals.

[0015] The present invention provides a heavy metal soil staged remediation system, which has the following beneficial effects:

[0016] 1. The present invention adopts thermal stripping to repair heavy metal soil. The high temperature environment in the thermal stripping chamber can effectively volatilize the heavy metals in the soil, thereby reducing the heavy metal content in the soil. At the same time, the auxiliary mechanism recovers the waste heat of the purified tail gas to assist in thermal stripping of the soil, further improving the removal efficiency of heavy metals. Especially when treating deep soil or soil contaminated with high concentrations of heavy metals, this synergistic effect can significantly improve the repair effect, allowing the soil to reach the repair standard faster, reducing the repair time and cost.

[0017] 2. The activated carbon layer in the purification mechanism of the present invention can initially adsorb heavy metal particles and volatile organic pollutants in the tail gas, and then the gas pipeline introduces gas to burn the tail gas at high temperature to decompose and oxidize complex organic pollutants. The purified tail gas enters the auxiliary mechanism to participate in soil thermal desorption, realizing the recovery and utilization of tail gas waste heat, which not only reduces energy consumption but also improves the overall energy efficiency of the system. Finally, the tail gas enters the condensation mechanism, and the condensate condenses the water vapor and condensable heavy metal vapor in the tail gas, achieving deep purification and reducing pollution emissions to the environment. The whole process forms a relatively complete tail gas treatment and resource recycling system.

[0018] 3. The design of the tilting component of the present invention enables the thermal stripping bin to adjust its tilting angle according to the different requirements of the thermal stripping stage. In the early stage of thermal stripping, the thermal stripping bin can be tilted to a suitable angle to ensure that the soil is evenly distributed in the one-way bin and fully heated, thereby improving the uniformity of thermal stripping; in the later stage of thermal stripping, by changing the tilting angle, the repaired soil can be smoothly guided to move to the feed channel, facilitating the output and subsequent processing of the soil. In addition, the auxiliary heating bin can slide on the support rod and can slide synchronously with the tilting of the thermal stripping bin, and additional auxiliary heating can be performed on the accumulated part in time when the soil is accumulated. This flexibility enables the system to adapt to the requirements of different soil conditions and repair processes, further improving the practicality and adaptability of the system.

[0019] 4. The condensation mechanism of the present invention not only achieves deep purification of tail gas, but also uses the residual heat of the tail gas when it passes through the condenser to pre-dry the repaired soil on the conveyor belt, thereby improving the soil treatment efficiency. The tail gas that is finally further cooled and purified by the condenser and the U-tube can quickly cool the soil when the soil is transported to the conveyor belt in a tilted manner from the hot debin, thereby achieving multiple utilization of resources. From an environmental protection perspective, the system effectively reduces the emission of harmful substances such as heavy metals and organic pollutants into the atmosphere through multi-stage treatment of tail gas, reduces potential harm to the surrounding environment and ecosystem, meets environmental protection requirements, and has good environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional diagram of the repair system of the present invention;

[0021] Figure 2 It is a display diagram of the repair system of the present invention;

[0022] Figure 3 for Figure 2 A in the enlarged view;

[0023] Figure 4 is a schematic diagram of the repair system of the present invention;

[0024] Figure 5 for Figure 4 The enlarged view of point B in the figure;

[0025] Figure 6 is a schematic diagram of the auxiliary mechanism in the present invention;

[0026] Figure 7 for Figure 6 The enlarged view of point C in the figure;

[0027] Figure 8 It is a schematic diagram of the auxiliary heating chamber in the present invention.

[0028] Among them, 1. base frame; 2. heat separation bin; 3. one-way bin; 4. sealed feed pipe; 5. conveying channel; 6. condensation mechanism; 601. condensation bin; 602. condensation pipe; 7. tilting assembly; 701. swivel; 702. shaft; 703. hydraulic rod; 8. purification mechanism; 801. purification bin; 802. activated carbon layer; 803. return air pipe; 9. auxiliary mechanism; 901. support rod; 902. auxiliary heating bin; 903. telescopic pipe; 904. annular pipe; 905. extension pipe; 906. through hole; 907. rolling ring; 908. roller; 10. gas pipeline; 11. exhaust pipe; 12. conveyor frame; 13. U-shaped pipe; 14. conveyor belt; 15. nozzle. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Please see attached Figure 1 -Attached Figure 8 The embodiment of the present invention provides a staged remediation system for heavy metal soil, comprising a base frame 1, wherein a heat removal bin 2 is rotatably connected inside the base frame 1, a one-way bin 3 is arranged inside the heat removal bin 2, a sealed feed pipe 4 is connected to one side of the outer wall of the one-way bin 3, which is used to transport unremediated soil into the one-way bin 3, a feed channel 5 is provided at the other end of the one-way bin 3, which is used to transport remediated soil, a gas pipeline 10 is connected to one end of the one-way bin 3, which is used to create a high-temperature environment inside the heat removal bin 2, an exhaust pipe 11 is connected to one side of the outer wall of the one-way bin 3, a purification mechanism 8 is connected to one end of the exhaust pipe 11, which is used to remove heavy metals contained in the burning gas, an auxiliary mechanism 9 is connected to the output end of the purification mechanism 8, the auxiliary mechanism 9 slides inside the heat removal bin 2, and is used to assist in heat removal of the soil inside the one-way bin 3, a tilting component 7 is installed at the bottom of the heat removal bin 2, which is used to change the direction of the soil inside the one-way bin 3, and a condensation mechanism 6 is connected to the output end of the auxiliary mechanism 9, which is used to condense and purify the tail gas.

[0031] The purification mechanism 8 includes a purification chamber 801, the input end of the purification chamber 801 is connected to one end of the exhaust pipe 11, the exhaust pipe 11 is provided with a uniformly distributed activated carbon layer 802, one side of the outer wall of the purification chamber 801 is connected to the gas pipeline 10, and the output end of the purification chamber 801 is connected to one end of the return air pipe 803;

[0032] Specifically, when the tail gas generated by the high-temperature burning of the soil in the one-way bin 3 enters the purification bin 801 through the exhaust pipe 11, it will first pass through the activated carbon layer 802 in the exhaust pipe 11. The activated carbon has a rich pore structure and a large specific surface area, and can adsorb some heavy metal particles and some volatile organic pollutants in the tail gas on its surface through physical adsorption, thereby preliminarily purifying the tail gas. After entering the purification bin 801, the gas pipeline 10 can pass gas into the purification bin 801 and burn it, further treating the tail gas at high temperature, so that some complex organic pollutants are decomposed and oxidized at high temperature and converted into harmless or easier to handle substances. The tail gas treated in the purification bin 801 enters the auxiliary mechanism 9 through the return pipe 803, realizing the reuse and further treatment of the tail gas, and because the purification mechanism 8 is connected to the gas pipeline 10, the tail gas is further burned, and the tail gas circulated in the return pipe 803 is hot gas after the initial burning and cleaning.

[0033] The auxiliary mechanism 9 includes a support rod 901, which is fixedly connected to one side of the inner wall of the one-way bin 3, and the outer wall of the support rod 901 is slidably connected to the auxiliary heating bin 902, and the outer wall of the auxiliary heating bin 902 is connected to one end of a telescopic tube 903, and the other end of the telescopic tube 903 passes through the one-way bin 3 and is connected to an annular tube 904, and the annular tube 904 at one end is connected to the other end of the return air pipe 803, and the annular tube 904 at the other end is connected to an extension tube 905;

[0034] The outer wall of the auxiliary heating chamber 902 is provided with a through hole 906, a rolling ring 907 is installed inside the through hole 906, and evenly distributed rollers 908 are installed inside the rolling ring 907;

[0035] Specifically, the exhaust gas output from the purification chamber 801 after preliminary purification and high-temperature treatment enters the annular pipe 904 through the return pipe 803, and then enters the auxiliary heating chamber 902 through the telescopic pipe 903. The auxiliary heating chamber 902 can slide on the support rod 901 to adjust its position in the one-way chamber 3 to meet the thermal degassing requirements of the soil at different stages. After the exhaust gas enters the auxiliary heating chamber 902, it is ejected through the through hole 906 on the outer wall. The rolling ring 907 and the internal roller 908 can make the exhaust gas ejection more uniform and stable, and prevent the local airflow from being too large or too small. These exhaust gases still have a relatively high temperature. After the heat transfer from the auxiliary heating chamber 902, they are fully in contact with the soil in the one-way chamber 3, and the soil is auxiliary heated, which improves the thermal degassing efficiency and makes the heavy metals in the soil more easily volatilize and detach from the soil particles at high temperatures. At the same time, this also realizes the recovery and utilization of waste heat from exhaust gas and reduces energy consumption. The roller 908 reduces the friction between the auxiliary heating bin 902 and the support rod 901, making the auxiliary heating bin 902 slide more smoothly.

[0036] The tilting assembly 7 includes a swivel 701, which is rotatably connected to the outer wall of the hot stripping bin 2, and a rotating shaft 702 is rotatably connected to one side of the outer wall of the swivel 701. A hydraulic rod 703 is installed on one side of the outer wall of the base frame 1, and the output end of the hydraulic rod 703 is fixedly connected to the inside of the rotating shaft 702.

[0037] Specifically, during the soil thermal stripping process, the hydraulic rod 703 can perform a telescopic action. When the hydraulic rod 703 is extended or retracted, it will drive the rotating shaft 702 to rotate. Since the rotating shaft 702 is connected to the rotating ring 701, and the rotating ring 701 is rotatably connected to the thermal stripping bin 2, the thermal stripping bin 2 will be tilted. By adjusting the tilt angle of the thermal stripping bin 2, the direction and distribution state of the soil in the one-way bin 3 can be changed. In the early stage of thermal stripping, the thermal stripping bin 2 can be tilted to a suitable angle so that the soil can be evenly distributed in the one-way bin 3 and fully heated; in the later stage of thermal stripping, the tilt angle can be changed so that the soil that has completed the thermal stripping treatment can be smoothly moved toward the feeding channel 5, which is convenient for outputting the repaired soil. In addition, when the thermal stripping bin 2 is tilted to various angles, the auxiliary heating bin 902 slides synchronously due to its own gravity. When the soil is accumulated inside the thermal stripping bin 2 due to gravity, the synchronous sliding of the auxiliary heating bin 902 timely performs additional auxiliary heating on this part of the accumulated soil, further improving the heavy metal thermal stripping effect of the accumulated soil.

[0038] A conveyor frame 12 is fixedly connected to one side of the outer wall of the bottom frame 1, a U-shaped pipe 13 is laid inside the conveyor frame 12, a conveyor belt 14 is installed inside the conveyor frame 12, and the conveyor belt 14 is located directly below the material conveying channel 5;

[0039] The condensation mechanism 6 includes a condensation chamber 601, which is fixedly connected to one side of the outer wall of the base frame 1, the input end of the condensation chamber 601 is connected to the extension pipe 905, the interior of the condensation chamber 601 is filled with condensate, the output end of the condensation chamber 601 is connected to one end of a condensation pipe 602, the condensation pipe 602 is laid inside the conveyor belt 14, and the other end of the condensation pipe 602 is connected to the U-shaped pipe 13;

[0040] The condensate is one of liquid nitrogen and ethylene glycol.

[0041] The U-shaped tube 13 is connected to a plurality of nozzles 15 at equal intervals;

[0042] Specifically, the exhaust gas discharged from the auxiliary heating chamber 902 enters the condensation chamber 601 through the extension pipe 905. The condensate (liquid nitrogen or ethylene glycol) in the condensation chamber 601 can absorb the heat in the exhaust gas, so that the water vapor and some condensable heavy metal vapors in the exhaust gas can be quickly condensed into liquid or solid particles, thereby achieving deep purification of the exhaust gas. The exhaust gas after condensation treatment enters the condensation pipe 602, which is laid inside the conveyor belt 14. On the one hand, the waste heat of the exhaust gas can be used to pre-dry the repaired soil on the conveyor belt 14 to improve the soil treatment efficiency; on the other hand, the exhaust gas is further cooled in the condensation pipe 602, and the residual pollutants continue to be condensed or adsorbed on the pipe wall. Finally, the exhaust gas is discharged through the U-tube 13 and the nozzle 15. In this process, the structure of the U-tube 13 can further cool the exhaust gas, and the nozzle 15 can evenly disperse the exhaust gas to reduce concentrated pollution to the environment. The exhaust gas deeply purified inside the condenser 602 and the U-tube 13 has the characteristics of low temperature and purity. After the thermal stripping bin 2 is tilted, the thermal stripping soil can be transported to the surface of the conveyor belt 14. The purified low-temperature exhaust gas can quickly cool this part of the soil, further improving the utilization rate of resources.

[0043] Working principle: The present invention provides a staged heavy metal soil remediation system, which realizes the functions of heavy metal soil remediation and tail gas treatment through the coordinated operation of multiple components, as follows:

[0044] The unrepaired soil enters the one-way bin 3 through the sealed feed pipe 4, and the gas pipe 10 supplies gas to the thermal degassing bin 2 to create a high-temperature environment so that the heavy metals in the soil are volatilized by heat. The generated tail gas passes through the exhaust pipe 11 and first passes through the activated carbon layer 802. The activated carbon uses its porous structure and large specific surface area to absorb some heavy metal particles and volatile organic pollutants in the tail gas through physical adsorption to complete the initial purification. After that, the tail gas enters the purification bin 801, and the gas pipeline 10 is again passed with gas for combustion, so that the complex organic pollutants are decomposed and oxidized into harmless or easier to handle substances at high temperature. The treated tail gas enters the subsequent links through the return pipe 803;

[0045] The exhaust gas in the return air pipe 803 enters the annular pipe 904, and then enters the auxiliary heating bin 902 through the telescopic pipe 903. The auxiliary heating bin 902 can slide on the support rod 901 to meet the needs of different heat-stripping stages. The exhaust gas is ejected through the through hole 906 on its outer wall. The rolling ring 907 and the roller 908 make the exhaust gas ejected evenly and stably. The exhaust gas fully contacts the soil in the one-way bin 3 to assist in heating, thereby improving the heat-stripping efficiency and realizing the recovery of waste heat from the exhaust gas. The roller 908 also reduces the friction between the auxiliary heating bin 902 and the support rod 901 to facilitate its sliding. When the heat-stripping bin 2 is tilted to pile up the soil, the auxiliary heating bin 902 can slide synchronously to provide additional auxiliary heat to the piled soil to enhance the heat-stripping effect;

[0046] During the thermal stripping process, the hydraulic rod 703 is extended and retracted to drive the rotating shaft 702 to rotate. Due to the connection between the rotating shaft 702, the rotating ring 701 and the thermal stripping chamber 2, the thermal stripping chamber 2 is tilted. In the early stage of thermal stripping, the tilting angle is adjusted to a suitable angle to allow the soil to be evenly heated. In the later stage of thermal stripping, the tilting angle is changed to allow the repaired soil to move to the feeding channel 5 for output;

[0047] The tail gas discharged from the auxiliary heating chamber 902 enters the condensation chamber 601 through the extension pipe 905. The liquid nitrogen or ethylene glycol condensate in the condensation chamber 601 absorbs the heat of the tail gas, so that the water vapor and condensable heavy metal vapor therein are condensed into liquid or solid particles to achieve deep purification. The purified tail gas enters the condensation pipe 602. The condensation pipe 602 uses the waste heat of the tail gas to pre-dry the repaired soil on the conveyor belt 14 and further cool the tail gas. The residual pollutants continue to condense or adsorb on the pipe wall. Finally, the tail gas is discharged through the U-shaped tube 13 and the nozzle 15. The U-shaped tube 13 is further cooled. The nozzle 15 evenly disperses the discharge to reduce pollution. At the same time, the low-temperature pure tail gas in the condensation pipe 602 and the U-shaped tube 13 can quickly cool the soil when the hot degassing chamber 2 tilts the soil to the conveyor belt 14, thereby improving resource utilization.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heavy metal soil staged remediation system, comprising a base frame (1), characterized in that: The bottom frame (1) is rotatably connected to a heat-release bin (2) inside, and a one-way bin (3) is arranged inside the heat-release bin (2). One side of the outer wall of the one-way bin (3) is connected to a sealed feed pipe (4) for conveying unrepaired soil into the one-way bin (3). The other end of the one-way bin (3) is provided with a feed channel (5) for conveying remediated soil. One end of the one-way bin (3) is connected to a gas pipeline (10) for creating a high-temperature environment inside the heat-release bin (2). One side of the outer wall of the one-way bin (3) is connected to an exhaust pipe (11). 1), one end of the exhaust pipe (11) is connected to a purification mechanism (8) for removing heavy metals contained in the burning gas, the output end of the purification mechanism (8) is connected to an auxiliary mechanism (9), the auxiliary mechanism (9) slides inside the heat removal bin (2), and is used to assist in heat removal of the soil inside the one-way bin (3), the bottom of the heat removal bin (2) is installed with a tilting component (7), which is used to change the direction of the soil inside the one-way bin (3), and the output end of the auxiliary mechanism (9) is connected to a condensation mechanism (6), which is used to condense and purify the exhaust gas.

2. A heavy metal soil staged remediation system according to claim 1, characterized in that: The purification mechanism (8) comprises a purification chamber (801), the input end of the purification chamber (801) is connected to one end of an exhaust pipe (11), a uniformly distributed activated carbon layer (802) is provided inside the exhaust pipe (11), one side of the outer wall of the purification chamber (801) is connected to a gas pipe (10), and the output end of the purification chamber (801) is connected to one end of a return air pipe (803).

3. A heavy metal soil staged remediation system according to claim 2, characterized in that: The auxiliary mechanism (9) comprises a support rod (901), wherein the support rod (901) is fixedly connected to one side of the inner wall of the one-way bin (3), and the outer wall of the support rod (901) is slidably connected to the auxiliary heating bin (902), and the outer wall of the auxiliary heating bin (902) is connected to one end of a telescopic tube (903), and the other end of the telescopic tube (903) passes through the one-way bin (3) and is connected to an annular tube (904), one end of the annular tube (904) is connected to the other end of the return air pipe (803), and the other end of the annular tube (904) is connected to an extension tube (905).

4. A heavy metal soil staged remediation system according to claim 1, characterized in that: The tilting assembly (7) comprises a swivel (701), the swivel (701) being rotatably connected to the outer wall of the hot stripping bin (2), one side of the outer wall of the swivel (701) being rotatably connected to a rotating shaft (702), a hydraulic rod (703) being installed on one side of the outer wall of the base frame (1), and an output end of the hydraulic rod (703) being fixedly connected to the inside of the rotating shaft (702).

5. A heavy metal soil staged remediation system according to claim 3, characterized in that: A conveying frame (12) is fixedly connected to one side of the outer wall of the base frame (1), a U-shaped tube (13) is laid inside the conveying frame (12), a conveying belt (14) is installed inside the conveying frame (12), and the conveying belt (14) is located directly below the material conveying channel (5).

6. A heavy metal soil staged remediation system according to claim 5, characterized in that: The condensation mechanism (6) includes a condensation bin (601), which is fixedly connected to one side of the outer wall of the base frame (1), the input end of the condensation bin (601) is connected to the extension tube (905), the interior of the condensation bin (601) is filled with condensate, the output end of the condensation bin (601) is connected to one end of a condensation pipe (602), the condensation pipe (602) is laid inside the conveyor belt (14), and the other end of the condensation pipe (602) is connected to the U-shaped tube (13).

7. A heavy metal soil staged remediation system according to claim 3, characterized in that: The outer wall of the auxiliary heating chamber (902) is provided with a through hole (906), a rolling ring (907) is installed inside the through hole (906), and evenly distributed rollers (908) are installed inside the rolling ring (907).

8. A heavy metal soil staged remediation system according to claim 6, characterized in that: The condensate is one of liquid nitrogen and ethylene glycol.

9. A heavy metal soil staged remediation system according to claim 1, characterized in that: The U-shaped tube (13) is connected to a plurality of nozzles (15) at equal intervals.

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