Heavy metal soil combined remediation device and method

Abstract

The invention provides a heavy metal soil combined remediation device and method, and belongs to the technical field of contaminated soil remediation, the device comprises a contaminated soil stirring assembly, a contaminated soil discharge assembly, a lifting assembly, a conveying assembly, a magnetic separation assembly, a clean soil stirring assembly, a clean soil discharge assembly and a remixing assembly; the contaminated soil stirring assembly is located at the top of the lifting assembly, and the contaminated soil discharging assembly is located outside the contaminated soil stirring assembly; the magnetic separation assembly is located at the top of the conveying assembly. The remixing assembly is located at the bottom of the conveying assembly, and one side of the remixing assembly is connected with the conveying assembly; the other side of the remixing assembly is connected with the clean soil discharging assembly; the clean soil stirring assembly is detachably connected with the clean soil discharging assembly. According to the method, the heavy metal ions are absorbed by the nanoscale zero-valent iron, the heavy metal ions in the soil are effectively adsorbed and removed, and the content of the heavy metal is reduced again by remixing the reacted soil with the clean soil.

Description

Technical Field

[0001] The present invention belongs to the technical field of contaminated soil restoration, and in particular relates to a heavy metal soil combined remediation device and method. Background Art

[0002] Heavy metal pollutants in the soil mainly include cadmium, chromium, nickel, lead, copper and zinc. The common method for treating heavy metal contaminated soil in the prior art is chemical remediation. The chemical remediation method mainly involves sampling and analyzing the soil to determine the types of heavy metals that are contaminated, and then mixing corresponding soil remediation agents. The remediation agents are used to change the chemical properties of heavy metals in the soil, thereby achieving soil remediation. Generally, the soil to be remediated needs to be turned over in advance and then sprayed with remediation agents. Since the degree of heavy metal contamination in the soil is inconsistent and the heavy metal content in each region is uneven, when the same concentration of remediation agents is used to treat the contaminated soil, when the heavy metal content in the region is relatively low, some of the remediation agents will remain in the soil, causing secondary damage to the soil. When the heavy metal content in the region is relatively high, the heavy metal ions in the soil in the region cannot be effectively removed. Therefore, this method cannot be promoted in large areas of heavy metal contaminated soil.

[0003] Patent document CN118385266B discloses an efficient garden soil repair device based on garden soil, including a mobile vehicle, a liquid storage tank and a crushing component. Through the setting of the mixing component, not only can the second mixing rod effectively complete the lateral mixing effect of the mixed liquid, but also this scheme also arranges a connecting slide rod and a connecting ball inside the connecting sleeve, and by allowing the connecting ball to slide in the spiral groove, not only can the connecting sleeve be synchronously rotated with the second connecting shaft rod, thereby driving the first mixing rod to complete the longitudinal mixing effect of the mixed liquid, but also through the sliding abutment between the abutment plate and the second movable slide groove, the second connecting shaft rod can also move accordingly, so that the second mixing rod can be in a reciprocating state, thereby driving the repair liquid that has completed the preliminary mixing to shake in the up and down directions, so as to a certain extent, the mixing effect of the repair liquid is aggravated. This patent solves the problem of uniform mixing of the repair agent, but still does not solve the problem of using the same concentration of repair agent to treat contaminated soil. When the heavy metal content in the area is relatively low, some of the repair agent will remain in the soil, causing secondary damage to the soil. When the heavy metal content in the area is relatively high, the heavy metal ions in the soil in the area cannot be effectively removed. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a heavy metal soil combined remediation device and method, which effectively solves the problem in the prior art that due to the inconsistent degree of heavy metal contamination of the soil, the heavy metal content in each area is uneven, and the same concentration of remediation agent is used to treat the contaminated soil. When the heavy metal content in the area is relatively low, part of the remediation agent will remain in the soil, causing secondary damage to the soil. When the heavy metal content in the area is relatively high, the heavy metal ions in the soil in the area cannot be effectively removed, so this method cannot be promoted in large areas of heavy metal contaminated soil.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a heavy metal soil combined remediation device, comprising a contaminated soil stirring component, a contaminated soil discharge component, a lifting component, a conveying component, a magnetic separation component, a clean soil stirring component, a clean soil discharge component and a remixing component; the contaminated soil stirring component is located at the top of the lifting component, and the contaminated soil discharge component is located outside the contaminated soil stirring component; the conveying component is located on one side of the contaminated soil discharge component; the magnetic separation component is located on the top of the conveying component; the remixing component is located at the bottom of the conveying component, and the top of one side of the remixing component is connected to the conveying component; the top of the other side of the remixing component is connected to the clean soil discharge component; the clean soil stirring component and the clean soil discharge component are detachably connected.

[0006] Preferably, the contaminated soil stirring assembly includes a first cylinder, a first stirring motor mounting plate, a first stirring motor and a first stirring assembly, a U-shaped connecting frame is provided at the bottom of the bottom plate of the first cylinder, the first stirring motor mounting plate is located at the top of the first cylinder and connected thereto, the first stirring motor is connected to the first stirring motor mounting plate, the protruding shaft of the first stirring motor extends into the interior of the first cylinder, and the protruding shaft of the first stirring motor is connected to the first stirring assembly through a coupling.

[0007] Preferably, a first discharge port is provided on the first cylinder, the cross-section of the first discharge port is rectangular, a liquid inlet pipe is provided on the first stirring motor mounting plate; the first stirring motor mounting plate and the first cylinder form a contaminated soil inlet; and a circular support plate is provided on the lifting assembly.

[0008] Preferably, the contaminated soil discharge assembly includes a second cylinder and a connecting ring, the connecting ring is located at the bottom of the second cylinder and fixedly connected thereto, the second cylinder is located outside the first cylinder and engaged therewith, the second cylinder is provided with a first groove, a second groove and a second discharge outlet, when the lifting assembly is in a retracted state, the lowest point of the second discharge outlet is higher than the highest point of the first discharge outlet, when the lifting assembly rises, the reacted soil that is evenly mixed with the nano zero-valent iron solution flows from the first discharge outlet through the second discharge outlet to the conveying assembly.

[0009] Preferably, the conveying assembly includes a conveying box, a first adapter cylinder and a conveying support frame, the conveying box is located on the top of the conveying support frame and is fixedly connected thereto, and a third discharge outlet is provided at one end of the conveying box close to the remixing assembly, and the third discharge outlet is communicated with the first adapter cylinder.

[0010] Preferably, the magnetic separation assembly includes an electric push rod assembly, a push rod connecting frame, a magnetic control switch plate and a push rod connecting plate. The electric push rod assembly is fixedly connected to the push rod connecting frame. A connecting block is provided at the outermost end of the extending shaft of the electric push rod assembly. The magnetic control switch plate is connected to the two electric push rod assemblies through the connecting block. The magnetic control switch plate is located above the conveying box and parallel to it. The two push rod connecting frames are fixedly connected to the push rod connecting plates through bolts.

[0011] Preferably, the clean soil stirring assembly includes a third cylinder, a second stirring motor mounting plate, a second stirring motor and a second stirring assembly, the bottom of the third cylinder is in a closed state, the second stirring motor mounting plate is located inside the third cylinder and connected thereto, the extended shaft of the second stirring motor is connected to the second stirring assembly through a coupling, a throw-out hole is provided on the outer wall of the third cylinder, and a clean soil inlet is provided on the top of the side wall of the third cylinder.

[0012] Preferably, the clean soil discharge assembly includes a fourth cylinder, a second adapter cylinder and a support ring, the second adapter cylinder is located at the bottom of the fourth cylinder and is fixedly connected thereto, the support ring is located at the top of the fourth cylinder and is fixedly connected thereto, the main body of the remixing assembly is a mixer, a first feed inlet and a second feed inlet of the mixer are provided at the top of the mixer, and a mixer discharge port is provided at the center of the bottom of the mixer.

[0013] Preferably, it also comprises a plant restoration area, wherein the plants planted in the plant restoration area are reeds.

[0014] The present invention also provides a method for using a heavy metal soil combined remediation device, which includes the following methods: a method for reducing the heavy metal content of contaminated soil S1, a method for throwing out clean soil S2, and a method for remixing and using S3; The method S1 for reducing the heavy metal content in contaminated soil comprises the following steps: S11, the contaminated soil that has been preliminarily crushed and has had large particles of impurities removed enters the first cylinder from the contaminated soil inlet; S12, starting the first stirring motor to drive the first stirring component to rotate, and the nano zero-valent iron solution is uniformly sprayed into the first cylinder from the liquid inlet pipe. When a specified amount is reached, the solution is stopped from entering, and stirring is continued until a preset time stops; S13, standing still to allow the nano-zero-valent iron to fully contact and react with the heavy metal ions in the contaminated soil, and the heavy metal ions are adsorbed or reduced; S14, after standing for a preset time, the first stirring motor is started again to mix the reacted soil in the first cylinder evenly, and after the set time, the lifting assembly is started, and the lifting assembly pushes the contaminated soil stirring assembly to rise as a whole, and the reacted soil flows from the first discharge outlet to the second discharge outlet to the conveying assembly; S15, when the reacted soil falls through the conveying component, the reacted nano zero-valent iron is adsorbed by the magnetic separation component, and the reacted soil with reduced heavy metal content falls into the re-mixing component through the first feed port of the mixer; The clean soil throwing method S2 comprises the following steps: S21, the clean soil that has been preliminarily crushed and has had large particles of impurities removed enters the third cylinder from the clean soil inlet; S22, start the second stirring motor to drive the second stirring assembly to rotate, throw the clean soil out from the throwing hole, drop it into the fourth cylinder, and then drop it into the re-mixing assembly through the second feeding port of the mixer; The remixing method S3 comprises the following steps: S31, controlling the feed amount of the first feed inlet and the second feed inlet of the mixer by the rotation speed of the stirring motor of the mixer, and starting the mixer for stirring; S32, after stirring evenly, stop the operation of the mixer, and discharge the mixed soil in the mixer through the mixer discharge port; S33, transporting the remixed soil to the phytoremediation area by a transport device, and further reducing the heavy metal ion content of the remixed soil by planting reeds; S34, after the reeds are harvested, the heavy metal ion content of the remixed soil absorbed by the reeds is tested, and the soil that meets the content standard is used to make clean soil to achieve the recycling of clean soil.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention provides a heavy metal soil combined remediation device, which can effectively reduce the heavy metal content of heavy metal contaminated soil through the arrangement of a contaminated soil stirring component, a contaminated soil discharge component, a lifting component, a conveying component, a magnetic separation component, a clean soil stirring component, a clean soil discharge component, a remixing component and a plant remediation area. The remediation efficiency and continuity of soil containing heavy metals are improved through the integrated automated arrangement of contaminated soil treatment, nano zero-valent iron remediation, magnetic separation, clean soil ejection and remixing utilization.

[0016] (2) The present invention provides a heavy metal soil combined remediation device, which can effectively adsorb and remove heavy metal ions in the soil by combining the absorption of heavy metal ions by nano-zero-valent iron with magnetic separation. The concentration requirement of nano-zero-valent iron during the initial separation of the soil is relatively low, and no secondary damage is caused to the soil. The goal of reducing the heavy metal content in the soil is achieved by remixing the reacted soil with the clean soil.

[0017] (3) The heavy metal soil combined remediation device provided by the present invention transports the remixed soil to the plant remediation area, further reduces the residual heavy metal content by planting reeds, and can use the soil absorbed by the reeds as a source of clean soil, thereby reducing the inconvenience caused by transporting clean soil, saving resources and improving soil utilization.

[0018] (4) The present invention provides a heavy metal soil combined remediation device, which has strong applicability and can flexibly adjust various process parameters according to the specific soil properties and heavy metal types, such as the rotation speed of the stirring motor, the rising speed of the lifting component, and the flow rate and total content of the nano zero-valent iron solution, so as to be suitable for soil remediation needs under different conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional schematic diagram of embodiment 1 of the present invention; Figure 2 The present invention Figure 1 The main view; Figure 3 It is a schematic diagram of the connection between the contaminated soil stirring assembly and the lifting assembly of the present invention; Figure 4 is a schematic structural diagram of a contaminated soil discharge assembly of the present invention; Figure 5 is a schematic diagram of the second discharge outlet of the lifting assembly of the present invention in a retracted state; Figure 6 is a schematic diagram of the second discharge outlet of the lifting assembly of the present invention in an extended state; Figure 7 It is a schematic structural diagram of the conveying box of the present invention; Figure 8 It is a schematic diagram of the structure of the magnetic separation assembly of the present invention; Fig. 9 It is a structural schematic diagram of the clean soil mixing assembly of the present invention; Fig.10 is a schematic structural diagram of a clean soil discharge assembly of the present invention; Fig.11 It is a structural schematic diagram of the plant restoration area of ​​the present invention.

[0020] In the figure: 100, contaminated soil stirring assembly; 110, first cylinder; 111, first discharge outlet; 120, first stirring motor mounting plate; 130, first stirring motor; 140, first stirring assembly; 150, liquid inlet pipe; 160, contaminated soil inlet; 200, contaminated soil discharge assembly; 210, second cylinder; 211, first groove; 212, second groove; 213, second discharge outlet; 220, connecting ring; 300, lifting assembly; 310, circular support plate; 400, conveying assembly; 410, conveying box; 411, third discharge outlet; 420, first adapter cylinder; 500, magnetic separation assembly; 510 , electric push rod assembly; 520, magnetic switch plate; 530, push rod connecting plate; 600, clean soil mixing assembly; 610, third cylinder; 611, throwing hole; 612, clean soil inlet; 620, second mixing motor mounting plate; 630, second mixing motor; 640, second mixing assembly; 700, clean soil discharge assembly; 710, fourth cylinder; 720, second adapter cylinder; 730, support ring; 800, remixing assembly; 810, mixer; 820, first feed inlet of mixer; 830, second feed inlet of mixer; 840, discharge port of mixer; 900, plant restoration area; 910, reed. DETAILED DESCRIPTION

[0021] 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.

[0022] It should be pointed out that the terms "upper", "lower", "left", "right", "top", "bottom", "inside", "outside" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0023] It should be understood that, in the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. Embodiment 1

[0024] See attached Figures 1 to 10 A heavy metal soil combined remediation device provided in this embodiment 1 includes a contaminated soil stirring assembly 100, a contaminated soil discharge assembly 200, a lifting assembly 300, a conveying assembly 400, a magnetic separation assembly 500, a clean soil stirring assembly 600, a clean soil discharge assembly 700 and a remixing assembly 800.

[0025] The contaminated soil stirring assembly 100 is located at the top of the lifting assembly 300, and the contaminated soil stirring assembly 100 is fixedly connected to the extended shaft of the lifting assembly 300. The contaminated soil stirring assembly 100 includes a first cylinder 110, a first stirring motor mounting plate 120, a first stirring motor 130 and a first stirring assembly 140. A U-shaped connecting frame is provided at the bottom of the bottom plate of the first cylinder 110, and the lifting assembly 300 is fixedly connected to the contaminated soil stirring assembly 100 through the U-shaped connecting frame. The first stirring motor mounting plate 120 is located at the top of the first cylinder 110 and is fixedly connected thereto. The first stirring motor 130 is fixedly connected to the first stirring motor mounting plate 120. The extended shaft of the first stirring motor 130 extends into the interior of the first cylinder 110, and the extended shaft of the first stirring motor 130 is connected to the first stirring assembly 140 through a coupling.

[0026] The first cylinder 110 is provided with a first discharge port 111, the cross section of which is a rectangle, and the first stirring motor mounting plate 120 is provided with a liquid inlet pipe 150; the first stirring motor mounting plate 120 and the first cylinder 110 form a contaminated soil inlet 160. In order to better exert the effect of the present invention, the contaminated soil that has been preliminarily crushed and large-particle solid impurities (such as gravel) are generally allowed to enter the first cylinder 110 through the contaminated soil inlet 160.

[0027] The lifting assembly 300 is fixedly connected. The lifting assembly 300 is usually an electric cylinder. A circular support plate 310 is provided on the lifting assembly 300. The lifting assembly 300 is usually in a state of completed retraction as the initial state of the lifting device.

[0028] The contaminated soil discharge assembly 200 is detachably connected to the lifting assembly 300, and the contaminated soil discharge assembly 200 is located outside the contaminated soil mixing assembly 100; the contaminated soil discharge assembly 200 includes a second cylinder 210 and a connecting ring 220, the connecting ring 220 is located outside the second cylinder 210, the connecting ring 220 is located at the bottom of the second cylinder 210 and is fixedly connected thereto, the connecting ring 220 is connected to the circular support plate 310 by bolts, the second cylinder 210 is located outside the first cylinder 110 and is engaged therewith, the second cylinder 210 is provided with a first groove 211, a second groove 212 and a second discharge port 213, the first groove 211 is located at the top of the second groove 212, when the lifting assembly 300 is in a retracted state, the lowest point of the second discharge port 213 is higher than the highest point of the first discharge port 111, when the lifting assembly 300 rises, the reacted soil evenly mixed with the nano zero-valent iron solution flows from the first discharge port 111 to the second discharge port 213 to the conveying assembly 400.

[0029] The conveying assembly 400 is located on one side of the contaminated soil discharge assembly 200; the conveying assembly 400 includes a conveying box 410, a first adapter cylinder 420 and a conveying support frame 430, the conveying box 410 is located on the top of the conveying support frame 430 and is fixedly connected thereto, the conveying support frame 430 is fixedly connected, the conveying box 410 is inclined with respect to the horizontal plane, and a third discharge outlet 411 is provided at one end of the conveying box 410 close to the remixing assembly 800, and the third discharge outlet 411 is communicated with the first adapter cylinder 420.

[0030] The magnetic separation component 500 is located at the top of the conveying component 400; the magnetic separation component 500 includes an electric push rod component 510, a push rod connecting frame, a magnetic control switch plate 520 and a push rod connecting plate 530. The electric push rod component 510 is fixedly connected to the push rod connecting frame. The outermost end of the extended shaft of the electric push rod component 510 is provided with a connecting block. The magnetic control switch plate 520 is connected to the two electric push rod components 510 through the connecting block. The magnetic control switch plate 520 is located above the conveying box 410 and parallel to it. The two push rod connecting frames are fixedly connected to the push rod connecting plate 530 by bolts. During use, the magnetic separation component 500 is located at the top of the conveying component 400 and is set to the initial state. At this time, the electric push rod component 510 is in an extended state. When the reacted soil in the contaminated soil stirring component 100 is emptied, the electric push rod component 510 can be retracted and the magnetic control switch plate 520 is in a demagnetized state. At this time, the magnetic substance containing heavy metal ions originally adsorbed on the magnetic control switch plate 520 will fall into the designated container.

[0031] The remixing assembly 800 is located at the bottom of the conveying assembly 400, and the top of one side of the remixing assembly 800 is connected to the conveying assembly 400; the top of the other side of the remixing assembly 800 is connected to the clean soil discharge assembly 700; the clean soil stirring assembly 600 is detachably connected to the clean soil discharge assembly 700, and the remixing assembly 800 is fixedly connected through a support member (not shown in the figure). The main body of the remixing assembly 800 is a mixer 810, and a first mixer feed port 820 and a second mixer feed port 830 are provided at the top of the mixer 810. The first mixer feed port 820 is connected to the first adapter cylinder 420, and the second mixer feed port 830 is connected to the second adapter cylinder 720. A mixer discharge port 840 is provided at the center of the bottom of the mixer 810.

[0032] It is easy to understand that, in order to facilitate maintenance and disassembly, flanges (not shown) are often used to connect the first feed port 820 of the mixer and the first adapter cylinder 420, and the second feed port 830 of the mixer and the second adapter cylinder 720.

[0033] The clean soil stirring assembly 600 includes a third cylinder 610, a second stirring motor mounting plate 620, a second stirring motor 630 and a second stirring assembly 640. The bottom of the third cylinder 610 is in a closed state. The second stirring motor mounting plate 620 is located inside the third cylinder 610 and connected thereto. The top of the second stirring motor mounting plate 620 is flush with the top of the third cylinder 610. The second stirring motor 630 is fixedly connected to the second stirring motor mounting plate 620. The extended shaft of the second stirring motor 630 is connected to the second stirring assembly 640 through a coupling. A throwing hole 611 is opened on the outer wall of the third cylinder 610. A clean soil inlet 612 is provided on the top of the side wall of the third cylinder 610. The clean soil inlet 612 is located at the top of the throwing hole 611. In order to better exert the effect of the present invention, the clean soil that has been preliminarily crushed and large-particle solid impurities (such as stones) are removed generally enters the third cylinder 610 from the clean soil inlet 612.

[0034] The clean soil discharge assembly 700 includes a fourth cylinder 710 , a second adapter cylinder 720 and a support ring 730 . The second adapter cylinder 720 is located at the bottom of the fourth cylinder 710 and fixedly connected thereto. The support ring 730 is located at the top of the fourth cylinder 710 and fixedly connected thereto. Embodiment 2

[0035] See attached Figures 1 to 11 , this embodiment 2 provides a heavy metal soil combined remediation device. Compared with embodiment 1, this embodiment 2 covers all the components of embodiment 1. This embodiment 2 also includes a plant remediation area 900, and the plants planted in the plant reed 910 are.

[0036] The remixed soil of Example 1 is discharged through the mixer discharge port 840, and is transported to the plant restoration area 900 by a transportation device. The heavy metal ion content of the remixed soil is further reduced by planting reeds 910. After the reeds 910 are harvested, the heavy metal content of the soil is tested, and the soil absorbed by the reeds 910 can be used as a source of clean soil, thereby reducing the inconvenience caused by transporting the clean soil, saving resources, and improving the utilization rate of the soil, so as to realize the recycling of clean soil. Embodiment 3

[0037] See attached Figures 1 to 11 , this embodiment 3 provides a method for using a heavy metal soil combined remediation device, the method for using includes the following methods: a method for reducing the heavy metal content of contaminated soil S1, a method for throwing out clean soil S2 and a method for remixing S3; The method S1 for reducing the heavy metal content in contaminated soil comprises the following steps: S11, the contaminated soil that has been preliminarily crushed and has had large particles of impurities removed enters the first cylinder 110 from the contaminated soil inlet 160, and the feeding is stopped when a specified amount is reached; S12, start the first stirring motor 130 to drive the first stirring assembly 140 to rotate, and the nano zero-valent iron solution is uniformly sprayed into the first cylinder 110 from the liquid inlet pipe 150. When a specified amount of solution is reached, the solution is stopped from entering, and stirring is continued until a preset time stops; S13, standing still to allow the nano-zero-valent iron to fully contact and react with the heavy metal ions in the contaminated soil, and the heavy metal ions are adsorbed or reduced; S14, after standing for a preset time, the first stirring motor 130 is started again to mix the reacted soil in the first cylinder 110 evenly to avoid the aggregation of magnetic nano-parts iron, and the lifting assembly 300 is started after the set time, and the lifting assembly 300 pushes the contaminated soil stirring assembly 100 to rise as a whole, and the reacted soil flows from the first discharge port 111 to the second discharge port 213 to the conveying assembly 400; S15, when the reacted soil falls through the conveying component 400, the reacted nano zero-valent iron is adsorbed by the magnetic separation component 500, and the reacted soil with reduced heavy metal content falls into the re-mixing component 800 through the first feed port 820 of the mixer; The clean soil throwing method S2 comprises the following steps: S21, the clean soil that has been preliminarily crushed and has had large particles of impurities removed enters the third cylinder 610 from the clean soil inlet 612, and the feeding is stopped when a specified amount is reached; S22, start the second stirring motor 630 to drive the second stirring assembly 640 to rotate, and throw the clean soil out from the throwing hole 611, drop it into the fourth cylinder 710, and then drop it into the re-mixing assembly 800 through the second feed port 830 of the mixer; The remixing method S3 comprises the following steps: S31, controlling the feed amount of the first feed inlet 820 and the second feed inlet 830 of the mixer by the rotation speed of the mixer stirring motor, and starting the mixer 810 for stirring; S32, after the mixture is uniformly stirred, the operation of the mixer 810 is stopped, and the mixed soil in the mixer 810 is discharged through the mixer discharge port 840; S33, transporting the remixed soil to the plant restoration area 900 by a transport device, and further reducing the heavy metal ion content of the remixed soil by planting reeds 910; S34, after the reeds 910 are harvested, the heavy metal ion content of the remixed soil absorbed by the reeds 910 is tested, and the soil that meets the content standard is used to make clean soil to achieve the recycling of clean soil.

[0038] 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 joint remediation device, characterized in that: It comprises a contaminated soil stirring assembly (100), a contaminated soil discharging assembly (200), a lifting assembly (300), a conveying assembly (400), a magnetic separation assembly (500), a clean soil stirring assembly (600), a clean soil discharging assembly (700) and a remixing assembly (800); The contaminated soil stirring assembly (100) is located at the top of the lifting assembly (300), and the contaminated soil discharge assembly (200) is located outside the contaminated soil stirring assembly (100); the conveying assembly (400) is located at one side of the contaminated soil discharge assembly (200); the magnetic separation assembly (500) is located at the top of the conveying assembly (400); the remixing assembly (800) is located at the bottom of the conveying assembly (400), and the top of one side of the remixing assembly (800) is connected to the conveying assembly (400); the top of the other side of the remixing assembly (800) is connected to the clean soil discharge assembly (700); and the clean soil stirring assembly (600) and the clean soil discharge assembly (700) are detachably connected.

2. The heavy metal soil combined remediation device according to claim 1 is characterized in that: The contaminated soil stirring assembly (100) comprises a first cylinder (110), a first stirring motor mounting plate (120), a first stirring motor (130) and a first stirring assembly (140); a U-shaped connecting frame is arranged at the bottom of the bottom plate of the first cylinder (110); the first stirring motor mounting plate (120) is located at the top of the first cylinder (110) and is connected thereto; the first stirring motor (130) is connected to the first stirring motor mounting plate (120); an extended shaft of the first stirring motor (130) extends into the interior of the first cylinder (110); and the extended shaft of the first stirring motor (130) is connected to the first stirring assembly (140) via a coupling.

3. The heavy metal soil combined remediation device according to claim 2 is characterized in that: The first cylinder (110) is provided with a first discharge port (111), the cross section of the first discharge port (111) is rectangular, the first stirring motor mounting plate (120) is provided with a liquid inlet pipe (150); the first stirring motor mounting plate (120) and the first cylinder (110) form a contaminated soil inlet (160); and the lifting assembly (300) is provided with a circular support plate (310).

4. The heavy metal soil combined remediation device according to claim 3 is characterized in that: The contaminated soil discharge assembly (200) comprises a second cylinder (210) and a connecting ring (220), wherein the connecting ring (220) is located at the bottom of the second cylinder (210) and is fixedly connected thereto, and the second cylinder (210) is located outside the first cylinder (110) and is engaged therewith, and the second cylinder (210) is provided with a first groove (211), a second groove (212) and a second discharge outlet (213), and when the lifting assembly (300) is in a retracted state, the lowest point of the second discharge outlet (213) is higher than the highest point of the first discharge outlet (111), and when the lifting assembly (300) rises, the reacted soil that is uniformly mixed with the nano zero-valent iron solution flows from the first discharge outlet (111) through the second discharge outlet (213) to the conveying assembly (400).

5. The heavy metal soil combined remediation device according to claim 1 is characterized in that: The conveying assembly (400) comprises a conveying box (410), a first adapter cylinder (420) and a conveying support frame (430); the conveying box (410) is located on the top of the conveying support frame (430) and is fixedly connected thereto; a third discharge outlet (411) is provided at one end of the conveying box (410) close to the remixing assembly (800); and the third discharge outlet (411) is communicated with the first adapter cylinder (420).

6. The heavy metal soil combined remediation device according to claim 5 is characterized in that: The magnetic separation assembly (500) comprises an electric push rod assembly (510), a push rod connecting frame, a magnetic control switch plate (520) and a push rod connecting plate (530); the electric push rod assembly (510) is fixedly connected to the push rod connecting frame; a connecting block is provided at the outermost end of the extended shaft of the electric push rod assembly (510); the magnetic control switch plate (520) is connected to two electric push rod assemblies (510) via the connecting block; the magnetic control switch plate (520) is located above the conveying box (410) and parallel thereto; and the two push rod connecting frames are fixedly connected to the push rod connecting plates (530) via bolts.

7. The heavy metal soil combined remediation device according to claim 4 is characterized in that: The clean soil stirring assembly (600) comprises a third cylinder (610), a second stirring motor mounting plate (620), a second stirring motor (630) and a second stirring assembly (640); the bottom of the third cylinder (610) is in a closed state; the second stirring motor mounting plate (620) is located inside the third cylinder (610) and connected thereto; the extended shaft of the second stirring motor (630) is connected to the second stirring assembly (640) via a coupling; an ejection hole (611) is provided on the outer wall of the third cylinder (610); and a clean soil inlet (612) is provided at the top of the side wall of the third cylinder (610).

8. The heavy metal soil combined remediation device according to claim 7 is characterized in that: The clean soil discharge assembly (700) comprises a fourth cylinder (710), a second adapter cylinder (720) and a support ring (730); the second adapter cylinder (720) is located at the bottom of the fourth cylinder (710) and is fixedly connected thereto; the support ring (730) is located at the top of the fourth cylinder (710) and is fixedly connected thereto; the main body of the remixing assembly (800) is a mixer (810); a first mixer feed port (820) and a second mixer feed port (830) are provided at the top of the mixer (810); and a mixer discharge port (840) is provided at the center of the bottom of the mixer (810).

9. The heavy metal soil combined remediation device according to claim 8, characterized in that: It also includes a plant restoration area (900), wherein the plants planted in the plant restoration area (900) are reeds (910).

10. The method for using the heavy metal soil combined remediation device according to claim 9, characterized in that: The use method includes the following methods: method S1 for reducing the heavy metal content of polluted soil, method S2 for throwing out clean soil and method S3 for remixing and using; The method S1 for reducing the heavy metal content in contaminated soil comprises the following steps: S11, the contaminated soil that has been preliminarily crushed and has had large impurities removed enters the first cylinder (110) from the contaminated soil inlet (160); S12, starting the first stirring motor (130) to drive the first stirring assembly (140) to rotate, and the nano zero-valent iron solution is uniformly sprayed into the first cylinder (110) from the liquid inlet pipe (150). When a specified amount of solution is reached, the solution is stopped from entering, and stirring is continued until a preset time has passed; S13, standing still to allow the nano-zero-valent iron to fully contact and react with the heavy metal ions in the contaminated soil, and the heavy metal ions are adsorbed or reduced; S14, after standing for a preset time, the first stirring motor (130) is started again to mix the reacted soil in the first cylinder (110) evenly, and after the set time, the lifting component (300) is started, the lifting component (300) pushes the contaminated soil stirring component (100) to rise as a whole, and the reacted soil flows from the first discharge outlet (111) to the second discharge outlet (213) to the conveying component (400); S15, when the reacted soil falls through the conveying component (400), the reacted nano zero-valent iron is adsorbed by the magnetic separation component (500), and the reacted soil with reduced heavy metal content falls into the re-mixing component (800) through the first feed port (820) of the mixer; The clean soil throwing method S2 comprises the following steps: S21, the clean soil that has been preliminarily crushed and has had large particles of impurities removed enters the third cylinder (610) from the clean soil inlet (612); S22, starting the second stirring motor (630) to drive the second stirring component (640) to rotate, so that the clean soil is thrown out from the throwing hole (611), falls into the fourth cylinder (710), and then falls into the re-mixing component (800) through the second feed port (830) of the mixer; The remixing method S3 comprises the following steps: S31, controlling the feed amount of the first feed inlet (820) and the second feed inlet (830) of the mixer by the rotation speed of the mixer stirring motor, and starting the mixer (810) for stirring; S32, after the mixture is evenly stirred, the operation of the mixer (810) is stopped, and the mixed soil in the mixer (810) is discharged through the mixer discharge port (840); S33, transporting the remixed soil to the plant restoration area (900) by a transport device, and further reducing the heavy metal ion content of the remixed soil by planting reeds (910); S34, after the reeds (910) are harvested, the heavy metal ion content of the remixed soil absorbed by the reeds (910) is tested, and the soil that meets the content standard is used to make clean soil, so as to achieve the recycling of clean soil.

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