Remediation equipment and remediation method for heavy metal contaminated soil in dressing and smelting slag field

Abstract

The invention discloses remediation equipment and a remediation method for heavy metal contaminated soil in a dressing and smelting slag field. The remediation equipment comprises a drilling assembly, a crushing assembly arranged on the drilling assembly and an injection assembly arranged on the crushing assembly. The drilling assembly is used for drilling the heavy metal contaminated soil; the crushing assembly is used for loosening the heavy metal contaminated soil; the injection assembly is used for injecting the remediation agent into the heavy metal contaminated soil; the remediation equipment is reasonable in structural design, in-situ bioremediation is conducted on the heavy metal contaminated soil in the dressing and smelting slag field through the microbial remediation agent, heavy metal pollutants in the soil are effectively solidified, the physical and chemical properties of the soil are not damaged in the remediation process, secondary pollution of the soil is avoided, and the remediation equipment is suitable for application and popularization.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation, and particularly relates to a device and a method for remediating heavy metal-polluted soil in a dressing and smelting slag yard. Background Art

[0002] At present, China is seriously polluted by heavy metals such as zinc, lead, and cadmium. More than 40% of these heavy metal pollutions come from the non-ferrous metal mining, dressing, and smelting industries. Among them, the long-term unorganized stacking and non-compliant discharge of lead-zinc smelting slag have particularly significant impacts on the surrounding environmental pollution. The heavy metals in this smelting slag not only have the characteristics of wide diffusion, high toxicity, and difficult treatment, but also damage the endogenous microbial community structure. The migration to the surrounding soil and the resulting food safety problems directly endanger human health.

[0003] At present, there are many treatment methods for smelting slag. Most of them adopt chemical treatment technologies with reducing agents added. However, this method not only has high operating costs, but also the heavy metal sludge generated is easily redissolved, causing secondary pollution. The application of microbial remediation technology to heavy metal pollution remediation has been a research hotspot in recent years. By using the ability of some functional microorganisms to adsorb or transform heavy metal bound states, converting them from dissolved states to stable states, weakening the toxicity, mobility of heavy metals, and restricting bioavailability, thereby reducing the risk of environmental pollution. Summary of the Invention

[0004] In view of the above existing technical problems, the present invention provides a device and a method for remediating heavy metal-polluted soil in a dressing and smelting slag yard.

[0005] The technical solution of the present invention is as follows: A device for remediating heavy metal-polluted soil in a dressing and smelting slag yard includes a drilling assembly, a crushing assembly arranged on the drilling assembly, and an injection assembly arranged on the crushing assembly; the drilling assembly includes a U-shaped bracket, a follower plate arranged above the U-shaped bracket, a drill rod arranged on the lower bottom surface of the follower plate and passing through the U-shaped bracket, several rotating screws evenly distributed on the upper end surface of the U-shaped bracket and respectively threadedly connected to the follower plate, a reduction motor arranged on the upper end surface of the U-shaped bracket and providing power for each rotating screw at the same time, and a rotating motor arranged on the upper end surface of the follower plate and providing power for the drill rod; a conical drill bit is arranged at the bottom end of the drill rod; connection gears are sleeved on each rotating screw, and a driving turntable is rotatably clamped on the upper end surface of the U-shaped bracket. An internal gear ring that meshes with each connection gear at the same time is sleeved inside the driving turntable; an external gear ring is sleeved outside the driving turntable; the reduction motor is arranged on the upper end surface of the U-shaped bracket through a frame, and an output end of the reduction motor is connected to a driving gear that meshes with the external gear ring;

[0006] The crushing assembly includes several moving seats evenly distributed inside the drill pipe, crushing rods arranged on each moving seat, and a crushing motor arranged inside the drill pipe to provide power for the moving seats; a first cavity is arranged inside the drill pipe; each moving seat is slidably clamped inside the first cavity, the crushing rods are arranged on the sides of each moving seat away from each other, and each crushing rod can penetrate through the drill pipe; the output end of the crushing motor is connected with a pushing lead screw, and a threaded seat is threadedly connected to the pushing lead screw; a pushing plate is movably hinged on the outer side wall of the threaded seat and is movably hinged to each moving seat one by one.

[0007] The injection assembly includes injection tubes arranged one by one inside each crushing rod, a medicine box arranged on the upper end surface of the U-shaped bracket, and an injection pump arranged at the connection of the injection tube and the medicine box; each injection tube is connected to the medicine box through a conduit; injection holes communicated with the inside of the injection tube are arranged on the crushing rod.

[0008] Further, a stabilizing rod movably inserted into the U-shaped bracket is arranged on the outer side wall of the follower plate; a centering sleeve movably sleeved outside the drill pipe is arranged on the U-shaped bracket.

[0009] Note: By arranging the stabilizing rod and the centering sleeve, it is beneficial to improve the stability when the follower plate moves up and down, thereby improving the use reliability of the repair equipment.

[0010] Further, the injection tube is slidably clamped inside the crushing rod, a tail seat penetrating through the crushing rod and slidably clamped with the crushing rod is arranged at the tail end of the injection tube; guide rods slidably clamped with the tail seat are arranged on the inner wall of the crushing rod, and a first damping spring abutted against the tail seat is sleeved on the guide rods; wedge-shaped top blocks corresponding to the positions of each injection hole are arranged on the outer wall of the injection tube; anti-blocking tubes slide inside each injection hole; a plug clamped with the outer wall of the crushing rod is arranged at one end of the anti-blocking tube away from the injection tube; a second damping spring abutted against the inner wall of the crushing rod is sleeved outside the anti-blocking tube.

[0011] Note: When the crushing rod penetrates through the drill pipe and enters the contaminated soil, the tail seat contacts the inner wall of the drill pipe, and the injection tube slides inside the drill pipe. At this time, the wedge-shaped top block pushes the anti-blocking tube to move inside the injection hole, realizing the conduction between the anti-blocking tube and the injection hole, and can prevent soil particles from blocking the injection hole when the crushing rod enters the soil.

[0012] Further, a sliding ball head capable of abutting against the wedge-shaped top block is arranged at one end of the anti-blocking tube close to the injection tube.

[0013] Note: By arranging the sliding ball head, it is beneficial to improve the smoothness when the anti-blocking tube slides on the wedge-shaped top block.

[0014] Further, a second cavity is provided inside the drill pipe and below the first cavity; a return hole communicating with the inside of the second cavity is penetrated through the outer wall of the drill pipe; a return assembly is arranged inside the second cavity; the return assembly includes a return sleeve arranged inside the second cavity, a conveying screw rotatably clamped inside the return sleeve, and a conveying motor arranged inside the drill pipe to provide power for the conveying screw; a return branch pipe communicating with each injection pipe is arranged at the top end of the return sleeve;

[0015] Explanation: After the repair agent enters the soil, it moves towards the deep soil under the action of gravity and enters the inside of the second cavity through the return hole in combination with the groundwater. At this time, the conveying motor drives the conveying screw to rotate inside the return sleeve, so that the mixture of the repair agent and groundwater enters the injection pipe through the return branch pipe for secondary utilization, which is beneficial to improving the action effect and action period of the repair agent.

[0016] Further, a cleaning brush abutting against the inner wall of the second cavity is sleeved on the conveying screw;

[0017] Explanation: During the rotation of the conveying screw, the cleaning brush is driven to rotate. The cleaning brush can clean the pollutants adsorbed on the inner wall of the second cavity, thereby preventing the return hole from being blocked.

[0018] Further, it also includes a PLC controller arranged on the U-shaped bracket; an induction seat is movably inserted at the bottom end of the conical drill bit, and a pressure sensor abuting against the induction seat and electrically connected to the PLC controller is arranged inside the conical drill bit;

[0019] Explanation: During the process of the conical drill bit entering the soil, the induction seat presses the pressure sensor. When the pressure borne by the pressure sensor reaches the preset value, the rotation motor is controlled to start by the PLC controller. At this time, the rotation motor drives the drill pipe and the conical drill bit to rotate; when the pressure borne by the pressure sensor does not reach the preset value, only the driving force of the reduction motor is relied on to drive the drill pipe to extend into the underground soil. This design is beneficial to reducing the operation energy consumption of the repair equipment.

[0020] Further, a soil-breaking knife is arranged on the outer wall of the conical drill bit;

[0021] Explanation: By arranging the soil-breaking knife, it is beneficial to reduce the resistance during the rotation of the conical drill bit and improve the working efficiency of the repair equipment.

[0022] The present invention also provides a method for repairing heavy metal contaminated soil in a dressing and smelting slag yard. Based on the above-mentioned heavy metal contaminated soil repair equipment in a dressing and smelting slag yard, it includes the following steps:

[0023] S1. Move the repair device above the soil to be repaired. Use the reduction motor to drive the driving turntable and each rotating screw to rotate simultaneously, so that the follower plate drives the drill pipe to move downward along the U-shaped bracket under the action of the rotating screw. At the same time, use the rotating motor to drive the drill pipe to rotate, and finally make the drill pipe enter the heavy metal contaminated soil.

[0024] S2. Use the crushing motor to drive the pushing screw to rotate. The threaded seat moves downward during the rotation of the pushing screw, and uses the pushing plate to push each moving seat to slide inside the first cavity and move away from each other. During the movement of the moving seat, it drives the crushing rod to penetrate the drill pipe and insert it into the contaminated soil. At this time, use the rotating motor to drive the drill pipe to continue rotating, and use the crushing rod to stir the contaminated soil to make the contaminated soil in a loose state.

[0025] S3. Add the repair agent into the agent tank, and use the injection pump to inject the repair agent into the contaminated soil through the injection pipe and injection hole to solidify the heavy metal pollutants in the contaminated soil. Among them, the repair agent is prepared by mixing Bacillus pannonicus bacterium agent, Bacillus licheniformis bacterium agent, Bacillus subtilis agent and pure water in a volume ratio of 3:1:2:30. The injection dose of the repair agent is 15 - 25 ml / m 2 .

[0026] Compared with the prior art, the beneficial effects of the present invention are reflected in the following aspects:

[0027] First, the structure of the repair device of the present invention is reasonably designed. Using the microbial repair agent to carry out in-situ bioremediation on the heavy metal contaminated soil in the ore dressing slag yard, so that the heavy metal pollutants in the soil are effectively solidified, and the physical and chemical properties of the soil will not be damaged during the repair process, avoiding the generation of secondary soil pollution.

[0028] Second, the repair device of the present invention uses the rotating crushing rod to loosen the heavy metal contaminated soil, effectively improving the diffusion efficiency of the repair agent in the contaminated soil, thereby improving the repair effect of the heavy metal contaminated soil.

[0029] Third, the repair device of the present invention can reuse the repair agent by setting a reflux component, improving the utilization rate of the repair agent, prolonging the action time of the repair agent, and reducing the repair and treatment cost of the heavy metal contaminated soil. Description of the Drawings

[0030] Figure 1 is the longitudinal sectional view of the repair device of the present invention;

[0031] Figure 2 is the front view of the repair device of the present invention;

[0032] Figure 3It is a schematic structural diagram of the conical drill bit of the present invention;

[0033] Figure 4 It is a schematic connection diagram of the crushing component and the drill pipe of the present invention;

[0034] Figure 5 It is a distribution diagram of the crushing rod inside the drill pipe of the present invention;

[0035] Figure 6 It is a schematic connection diagram of the injection pipe and the crushing rod of the present invention;

[0036] Figure 7 It is the present invention Figure 6 A partial enlarged schematic diagram at A in;

[0037] Figure 8 It is a schematic connection diagram of the reflux component and the drill pipe of the present invention;

[0038] Among them, 1 - drilling component, 10 - U-shaped bracket, 100 - centering sleeve, 11 - follower plate, 110 - stabilizing rod, 12 - drill pipe, 120 - conical drill bit, 1200 - earth-breaking knife, 121 - first cavity, 122 - second cavity, 123 - reflux hole, 13 - rotating screw, 130 - connecting gear, 14 - reduction motor, 140 - frame, 141 - driving gear, 15 - rotating motor, 16 - driving turntable, 2 - crushing component, 20 - moving seat, 21 - crushing rod, 210 - injection hole, 22 - crushing motor, 220 - pushing lead screw, 221 - threaded seat, 222 - pushing plate, 3 - injection component, 30 - injection pipe, 300 - tail seat, 301 - guide rod, 302 - first damping spring, 303 - wedge-shaped top block, 31 - medicine tank, 32 - injection pump, 33 - anti-blocking pipe, 330 - plug, 331 - second damping spring, 332 - sliding ball head, 4 - reflux component, 40 - reflux sleeve, 400 - reflux branch pipe, 41 - conveying screw, 42 - conveying motor, 43 - cleaning brush, 5 - induction seat. Detailed implementation manners

[0039] Example 1

[0040] Such as Figure 1 、 2A heavy metal contaminated soil remediation device for a beneficiation and smelting slag yard is shown, including a drilling component 1, a crushing component 2 provided on the drilling component 1, and an injection component 3 provided on the crushing component 2; the drilling component 1 includes a U-shaped bracket 10, a follower plate 11 provided above the U-shaped bracket 10, a drill rod 12 provided on the lower bottom surface of the follower plate 11 and passing through the U-shaped bracket 10, two rotating screws 13 evenly distributed on the upper end surface of the U-shaped bracket 10 and threadedly connected to the follower plate 11 respectively, a reduction motor 14 provided on the upper end surface of the U-shaped bracket 10 and providing power for each rotating screw 13 at the same time, and a rotating motor 15 provided on the upper end surface of the follower plate 11 and providing power for the drill rod 12; a conical drill bit 120 is provided at the bottom end of the drill rod 12; a connecting gear 130 is sleeved on each rotating screw 13, a driving turntable 16 is rotatably clamped on the upper end surface of the U-shaped bracket 10, and an internal gear ring that meshes with each connecting gear 130 at the same time is sleeved inside the driving turntable 16; an external gear ring is sleeved outside the driving turntable 16; the reduction motor 14 is provided on the upper end surface of the U-shaped bracket 10 through a frame 140, and an output end of the reduction motor 14 is connected to a driving gear 141 that meshes with the external gear ring;

[0041] As Figure 1 、 4 、5 shows, the crushing component 2 includes 4 moving seats 20 evenly distributed inside the drill rod 12, crushing rods 21 provided on each moving seat 20, and a crushing motor 22 provided inside the drill rod 12 and providing power for the moving seats 20; a first cavity 121 is provided inside the drill rod 12; each moving seat 20 is respectively slidably clamped inside the first cavity 121, the crushing rods 21 are provided on one side of each moving seat 20 away from each other, and each crushing rod 21 can penetrate the drill rod 12; an output end of the crushing motor 22 is connected to a pushing lead screw 220, and a threaded seat 221 is threadedly connected to the pushing lead screw 220; a pushing plate 222 that is movably hinged to each moving seat 20 in a one-to-one correspondence is movably hinged on an outer side wall of the threaded seat 221;

[0042] As Figure 1 、 4 、5 shows, the injection component 3 includes injection tubes 30 provided in each crushing rod 21 in a one-to-one correspondence, a reagent tank 31 provided on the upper end surface of the U-shaped bracket 10, and an injection pump 32 provided at the connection between the injection tubes 30 and the reagent tank 31; each injection tube 30 is respectively connected to the reagent tank 31 through a conduit; an injection hole 210 that is communicated with the inside of the injection tube 30 is provided on the crushing rod 21.

[0043] Example 2

[0044] This example records a method for remediating heavy metal contaminated soil in a beneficiation and smelting slag yard. Based on the heavy metal contaminated soil remediation device in Example 1, it includes the following steps:

[0045] S1. Move the repair device above the soil to be repaired. Drive each rotating screw 13 to rotate simultaneously by using the reduction motor 14, so that the follower plate 11 drives the drill pipe 12 to move downward along the U-shaped bracket 10 under the action of the rotating screw 13. At the same time, drive the drill pipe 12 to rotate by using the rotating motor 15, and finally make the drill pipe 12 enter the heavy metal contaminated soil.

[0046] S2. Drive each moving seat 20 to slide inside the first cavity 121 and move away from each other by using the crushing motor 22. During the movement of the moving seat 20, drive the crushing rod 21 to penetrate the drill pipe 12 and insert it into the contaminated soil. At this time, drive the drill pipe 12 to rotate by using the rotating motor 15, and use the crushing rod 21 to stir the contaminated soil to make the contaminated soil in a loose state.

[0047] S3. Add the repair agent into the medicine chest 31, and inject the repair agent into the contaminated soil through the injection pipe 30 and the injection hole 210 by using the injection pump 32 to solidify the heavy metal pollutants in the contaminated soil. Among them, the repair agent is prepared by mixing the Pantoea alkaliphila bacterium agent, Bacillus licheniformis bacterium agent, Bacillus subtilis agent and pure water according to the volume ratio of 3:1:2:30, and the injection dose of the repair agent is 15 ml / m 2 ; The Pantoea alkaliphila bacterium agent, Bacillus licheniformis bacterium agent and Bacillus subtilis agent are all commercial strains produced by BeiNa Bio-Company.

[0048] Example 3

[0049] The difference between this example and Example 1 is as follows:

[0050] As Figure 1 shown, a stabilizing rod 110 that is movably inserted into the U-shaped bracket 10 is arranged on the outer side wall of the follower plate 11; a centering sleeve 100 that is movably sleeved outside the drill pipe 12 is arranged on the U-shaped bracket 10. By arranging the stabilizing rod 110 and the centering sleeve 100, it is beneficial to improve the stability of the follower plate 11 when moving up and down, thereby improving the use reliability of the repair device.

[0051] Example 4

[0052] The difference between this example and Example 3 is as follows:

[0053] As Figure 6 、 7As shown in the figure, the injection tube 30 is slidably clamped inside the crushing rod 21. A tail seat 300 that penetrates the crushing rod 21 and is slidably clamped to the crushing rod 21 is provided at the tail end of the injection tube 30. Guide rods 301 that are slidably clamped to the tail seat 300 are provided on the inner wall of the crushing rod 21. A first damping spring 302 that abuts against the tail seat 300 is sleeved on the guide rods 301. Wedge-shaped top blocks 303 are provided on the outer wall of the injection tube 30 at positions corresponding to the positions of the respective injection holes 210. Anti-blocking tubes 33 are slidably arranged inside the respective injection holes 210. A plug 330 that is clamped to the outer wall of the crushing rod 21 is provided at one end of the anti-blocking tube 33 away from the injection tube 30. A second damping spring 331 that abuts against the inner wall of the crushing rod 21 is sleeved outside the anti-blocking tube 33. A sliding ball head 332 that can abut against the wedge-shaped top block 303 is provided at one end of the anti-blocking tube 33 close to the injection tube 30.

[0054] Example 5

[0055] The difference between this example and Example 4 is as follows:

[0056] As Figure 1 、 8 shown in the figure, a second cavity 122 is provided inside the drill rod 12 and below the first cavity 121. A return hole 123 that is communicated with the inside of the second cavity 122 is provided through the outer side wall of the drill rod 12. A return assembly 4 is provided inside the second cavity 122. The return assembly 4 includes a return sleeve 40 provided inside the second cavity 122, a conveying screw 41 rotatably clamped inside the return sleeve 40, and a conveying motor 42 provided inside the drill rod 12 to provide power for the conveying screw 41. Return branch pipes 400 that are communicated with the respective injection tubes 30 are provided at the top end of the return sleeve 40. A cleaning brush 43 that abuts against the inner wall of the second cavity 122 is sleeved on the conveying screw 41.

[0057] Example 6

[0058] The difference between this example and Example 5 is as follows:

[0059] As Figure 3 shown in the figure, it further includes a PLC controller provided on the U-shaped bracket 10. An induction seat 5 is movably inserted at the bottom end of the conical drill bit 120. A pressure sensor that abuts against the induction seat 5 and is electrically connected to the PLC controller is provided inside the conical drill bit 120.

[0060] Example 7

[0061] The difference between this example and Example 6 is as follows:

[0062] As Figure 3 shown in the figure, a soil-breaking knife 1200 is provided on the outer wall of the conical drill bit 120. By providing the soil-breaking knife 1200, it is beneficial to reduce the resistance when the conical drill bit 120 rotates and improve the working efficiency of the repair equipment.

[0063] Example 8

[0064] This example describes a method for remediating heavy metal - contaminated soil in a mineral processing slag yard. Based on the heavy metal - contaminated soil remediation equipment in Example 7, it includes the following steps:

[0065] S1. Move the remediation equipment above the soil to be remediated. Start the reduction motor 14 through the PLC controller. Drive the drive turntable 16 and each rotating screw 13 to rotate simultaneously by the reduction motor 14, so that the follower plate 11 drives the drill rod 12 to move downward along the U - shaped bracket 10 under the action of the rotating screw 13. During the process of the conical drill bit 120 entering the soil, the induction seat 5 presses the pressure sensor. When the pressure borne by the pressure sensor reaches the preset value, start the rotation motor 15 through the PLC controller. At this time, the rotation motor 15 drives the drill rod 12 and the conical drill bit 120 to rotate;

[0066] S2. Start the crushing motor 22 through the PLC controller. Drive the push screw 220 to rotate by the crushing motor 22. The threaded seat 221 moves downward during the rotation of the push screw 220, and uses the push plate 222 to push each moving seat 20 to slide inside the first cavity 121 and move away from each other. During the movement of the moving seat 20, drive the crushing rod 21 to penetrate the drill rod 12 and insert it into the contaminated soil. At this time, use the rotation motor 15 to drive the drill rod 12 to continue rotating, and use the crushing rod 21 to stir the contaminated soil to make the contaminated soil in a loose state;

[0067] S3. Add the remediation agent into the agent tank 31. Start the injection pump 32 through the PLC controller, and use the injection pump 32 to inject the remediation agent into the contaminated soil through the injection pipe 30 and the injection hole 210 to solidify the heavy metal pollutants in the contaminated soil. Among them, the remediation agent is prepared by mixing Pantoea alkalitelluris bacterium agent, Bacillus licheniformis bacterium agent, Bacillus subtilis agent and pure water in a volume ratio of 3:1:2:30. The injection dose of the remediation agent is 25 ml / m 2 ; The Pantoea alkalitelluris bacterium agent, Bacillus licheniformis bacterium agent and Bacillus subtilis agent are all commercially available strains produced by Beina Biology Company. Among them, when the crushing rod 21 penetrates the drill rod 12 and enters the contaminated soil, the tail seat 300 contacts the inner wall of the drill rod 12, and makes the injection pipe 30 slide inside the drill rod 12. At this time, the wedge - shaped top block 303 pushes the anti - blocking pipe 33 to move inside the injection hole 210, realizing the conduction between the anti - blocking pipe 33 and the anti - blocking pipe 33;

[0068] S4. After the repair agent enters the soil, it moves towards the deep soil under the action of gravity, and enters the interior of the second cavity 122 through the groundwater via the return hole 123. The delivery motor 42 is started by controlling it with the PLC controller. The delivery screw 41 is driven by the delivery motor 42 to rotate inside the return sleeve 40, so that the mixture of the repair agent and groundwater enters the injection tube 30 through the return branch pipe 400 for secondary utilization.

[0069] It should be noted that the reduction motor 14, rotation motor 15, crushing motor 22, injection pump 32, delivery motor 42, PLC controller and pressure sensor used in the present invention are all products in the prior art, and no special limitation is made here. Those skilled in the art can select corresponding products according to actual needs; moreover, the connection relationship between the PLC controller and the pressure sensor, reduction motor 14, rotation motor 15, crushing motor 22, injection pump 32 and delivery motor 42 also belongs to the prior art.

Claims

1. A heavy metal contaminated soil remediation equipment for smelting slag field, characterized in that: The invention comprises a drilling assembly (1), a crushing assembly (2) arranged on the drilling assembly (1), and an injection assembly (3) arranged on the crushing assembly (2); the drilling assembly (1) comprises a U-shaped bracket (10), a follower plate (11) arranged above the U-shaped bracket (10), a drill rod (12) arranged on the bottom surface of the follower plate (11) and passing through the U-shaped bracket (10), a plurality of rotating screws (13) equidistantly distributed on the upper end surface of the U-shaped bracket (10) and respectively threadedly connected to the follower plate (11), a reduction motor (14) arranged on the upper end surface of the U-shaped bracket (10) and simultaneously providing power to each of the rotating screws (13), and a rotating motor (15) arranged on the upper end surface of the follower plate (11) and providing power to the drilling rod (12); The crushing assembly (2) comprises a plurality of movable seats (20) equidistantly distributed inside the drill rod (12), a crushing rod (21) arranged on each of the movable seats (20), and a crushing motor (22) arranged inside the drill rod (12) and providing power to the movable seats (20); a first cavity (121) is arranged inside the drill rod (12); each of the movable seats (20) is respectively slidably engaged inside the first cavity (121), the crushing rod (21) is arranged on a side of each of the movable seats (20) that is away from each other, and each of the crushing rods (21) can penetrate the drill rod (12); The injection assembly (3) comprises injection tubes (30) arranged one by one inside each of the crushing rods (21), a medicine box (31) arranged on the upper end surface of the U-shaped bracket (10), and an injection pump (32) arranged at the connection between the injection tubes (30) and the medicine box (31); each of the injection tubes (30) is connected to the medicine box (31) via a conduit; and the crushing rod (21) is provided with an injection hole (210) which is in communication with the inside of the injection tube (30).

2. The heavy metal contaminated soil remediation equipment for smelting slag field according to claim 1 is characterized in that: The outer wall of the follower plate (11) is provided with a stabilizing rod (110) movably plugged into the U-shaped bracket (10); the U-shaped bracket (10) is provided with a straightening sleeve (100) movably sleeved on the outside of the drill rod (12).

3. The heavy metal contaminated soil remediation equipment for smelting slag field according to claim 1 is characterized in that: The injection tube (30) is slidably engaged inside the crushing rod (21), and a tail seat (300) penetrating the crushing rod (21) and slidably engaged with the crushing rod (21) is provided at the rear end of the injection tube (30); a guide rod (301) slidably engaged with the tail seat (300) is provided on the inner wall of the crushing rod (21), and a first damping spring (302) abutting against the tail seat (300) is sleeved on the guide rod (301); the injection tube (300) is provided with a plurality of springs, each of which ... A wedge-shaped top block (303) is arranged on the outer wall of the injection hole (210) and at a position corresponding to each of the injection holes (210); an anti-blocking tube (33) is slidably arranged inside each of the injection holes (210); a plug (330) is arranged at one end of the anti-blocking tube (33) away from the injection tube (30) and is engaged with the outer wall of the crushing rod (21); and a second damping spring (331) is sleeved on the outside of the anti-blocking tube (33) and is in contact with the inner wall of the crushing rod (21).

4. The heavy metal contaminated soil remediation equipment for smelting slag field according to claim 3 is characterized in that: One end of the anti-blocking tube (33) close to the injection tube (30) is provided with a sliding ball head (332) capable of abutting against the wedge-shaped top block (303).

5. The heavy metal contaminated soil remediation equipment for smelting slag field according to claim 1 is characterized in that: A second cavity (122) is arranged inside the drill rod (12) and below the first cavity (121); a reflux hole (123) communicating with the interior of the second cavity (122) is arranged through the outer wall of the drill rod (12); a reflux assembly (4) is arranged inside the second cavity (122); the reflux assembly (4) comprises a reflux sleeve (40) arranged inside the second cavity (122), a conveying screw (41) rotatably engaged with the interior of the reflux sleeve (40), and a conveying motor (42) arranged inside the drill rod (12) and providing power to the conveying screw (41); a reflux branch pipe (400) communicating with each of the injection tubes (30) is arranged at the top end of the reflux sleeve (40).

6. The heavy metal contaminated soil remediation equipment for smelting slag field according to claim 1, characterized in that: It also includes a PLC controller arranged on the U-shaped bracket (10); a sensing seat (5) is movably inserted at the bottom end of the conical drill bit (120); a pressure sensor is arranged inside the conical drill bit (120) and is in contact with the sensing seat (5) and is electrically connected to the PLC controller.

7. A method for remediating heavy metal contaminated soil in a smelting slag field, based on the heavy metal contaminated soil remediation equipment in a smelting slag field according to claim 3, characterized in that: The following steps are involved: S1. Move the repair device to the soil to be repaired, use the reduction motor (14) to drive each rotating screw (13) to rotate, so that the follower plate (11) drives the drill rod (12) to move downward along the U-shaped bracket (10) under the action of the rotating screw (13); at the same time, use the rotating motor (15) to drive the drill rod (12) to rotate, and finally make the drill rod (12) enter the heavy metal contaminated soil; S2. Using a crushing motor (22) to drive each movable seat (20) to slide inside the first cavity (121) and move away from each other; during the movement of the movable seat (20), the crushing rod (21) is driven to penetrate the drill rod (12) and insert into the contaminated soil; at this time, the rotary motor (15) is used to drive the drill rod (12) to continue rotating, and the crushing rod (21) is used to stir the contaminated soil, so that the contaminated soil is in a loose state; S3. Add the repair agent into the agent box (31), and use the injection pump (32) to inject the repair agent into the contaminated soil through the injection tube (30) and the injection hole (210), so as to solidify the heavy metal pollutants in the contaminated soil; at the same time, when the crushing rod (21) penetrates the drill rod (12) and enters the contaminated soil, the tailstock (300) contacts the inner wall of the drill rod (12), and the injection tube (30) slides inside the drill rod (12). At this time, the wedge-shaped top block (303) pushes the anti-blocking tube (33) to move inside the injection hole (210), thereby realizing the conduction between the anti-blocking tubes (33) and the anti-blocking tubes (33).

8. The heavy metal contaminated soil remediation equipment for smelting slag field according to claim 1 is characterized in that: The anti-blocking pipe (33) is provided with a sliding ball head (332).

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