Soil remediation technology for heavy metal karst area pollution and product preparation method

Abstract

The invention discloses a soil remediation technology for heavy metal karst area pollution and a product preparation method, and relates to the technical field of soil remediation. According to the method, in the soil improvement process of the heavy metal karst area, heavy metal soil improvement agents with different proportions are injected into holes with different depths one by one through the layered injection technology, separated improvement is conducted according to the heavy metal pollution condition of the soil, and the remediation effect of the soil in the karst area is improved; by means of the grinding equipment composed of the crushing mechanism, the grinding mechanism and the screening mechanism, in the phospholime grinding treatment process, two crushing rollers in the crushing mechanism conduct crushing treatment on phospholime, and first protrusions and second protrusions in the grinding mechanism synchronously and reversely rotate to conduct grinding treatment on the crushed phospholime; and a sieve plate in the screening mechanism is used for synchronously screening the ground phospholime particles, so that the phospholime particles required for preparing the heavy metal soil conditioner can be obtained, and the preparation efficiency of the heavy metal soil conditioner is improved.

Description

Technical Field

[0001] This invention relates to the field of soil remediation technology, specifically to a soil remediation technology and product preparation method for heavy metal karst pollution. Background Technology

[0002] Karst areas refer to regions with soluble rocks (such as limestone and dolomite) that have formed unique landforms through long-term dissolution by groundwater and surface water. Soil remediation in karst areas mainly refers to the process of reducing the concentration of heavy metal pollutants in the soil and restoring its ecological functions through physical, chemical or biological technologies.

[0003] When remediating soil in karst areas using lime conditioning, existing techniques still have some shortcomings:

[0004] 1. When remediating soil using lime adjustment, existing technologies are often inconvenient to improve the soil according to its heavy metal pollution status. Since the heavy metal pollution status of soil at different depths varies, if it cannot be improved separately, the soil remediation effect will be affected, resulting in poor remediation effect of soil in karst areas.

[0005] 2. Meanwhile, in the process of preparing heavy metal soil conditioners, existing technologies usually grind lime raw materials using grinding equipment. Since the particle size of lime raw materials is relatively large, direct grinding would require a lot of grinding time. In addition, grinding equipment is not convenient for screening the ground particles, resulting in low grinding efficiency of lime raw materials, which in turn affects the preparation efficiency of heavy metal soil conditioners.

[0006] To address the aforementioned problems, the inventors have proposed a soil remediation technology and product preparation method for heavy metal karst areas to solve these issues. Summary of the Invention

[0007] To address the aforementioned problems, the present invention aims to provide a soil remediation technology and product preparation method for heavy metal karst areas.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a soil remediation technology for heavy metal karst areas, comprising the following steps:

[0009] S1. Drill holes in the karst area using drilling equipment, drilling to the target layer, bringing out soil samples of different depths during the drilling operation, and forming holes of different depths in the karst area at the same time.

[0010] S2. Analyze the soil stone blocks, analyze the heavy metal composition and content in the soil blocks, and mark them. Mark the corresponding pores of each soil block and the heavy metal data of the soil blocks.

[0011] S3. Based on the heavy metal composition and content of the marked soil samples, different types of heavy metal soil conditioners are prepared. Through a layered injection process, different types of heavy metal soil conditioners are injected one by one into multiple holes of different depths. The heavy metal soil conditioners seep in and diffuse along the gaps in the holes, increasing the pH value of the soil, causing heavy metal ions to precipitate, and reducing the degree of heavy metal pollution in the karst area soil.

[0012] This invention also provides a product preparation method for soil remediation technology in karst areas contaminated with heavy metals, the preparation method of the heavy metal soil conditioner includes the following steps:

[0013] S1. Add phosphate lime to the grinding equipment for grinding, while simultaneously pyrolyzing the straw, and then use potassium hydroxide to impregnate and activate the pyrolyzed straw.

[0014] S2. Mix iron tailings and potassium hydroxide in a ratio of 4:1, and calcine them at high temperature in a muffle furnace for 2-3 hours for later use.

[0015] S3. Add the ground phosphate lime, impregnated and activated straw and iron tailings to the mixing equipment, and add compound microbial agent and binder at the same time. After mixing evenly, put it into a constant temperature incubator for constant temperature incubation for 30-36 hours.

[0016] S4. Add the semi-finished material that has been cultured at a constant temperature to the granulation equipment, and granulate it into 1-3 mm particles to obtain the heavy metal soil conditioner.

[0017] Preferably, the grinding equipment includes a processing tank, a storage hopper is fixedly provided at one end of the processing tank, a guide hopper and a collection hopper are fixedly provided from top to bottom in the inner cavity of the processing tank, and a crushing mechanism, a grinding mechanism and a screening mechanism are provided from top to bottom in the inner cavity of the processing tank, the guide hopper is located between the crushing mechanism and the grinding mechanism, and the collection hopper is located between the grinding mechanism and the screening mechanism.

[0018] Preferably, a plurality of support frames are fixedly provided at the other end of the treatment tank, and an inspection door panel is hinged to the other end of the treatment tank.

[0019] Preferably, the crushing mechanism includes two crushing rollers, which are rotatably installed in the inner cavity of the processing tank. One end of each crushing roller is fixedly provided with a transmission gear, and the two transmission gears are meshed together. One end of the processing tank is fixedly provided with a servo motor, and the drive output end of the servo motor is fixedly connected to one end of one of the crushing rollers.

[0020] Preferably, the grinding mechanism includes a lower grinding seat and an upper grinding seat, which are located below the guide hopper. The lower end face of the upper grinding seat and the upper end face of the lower grinding seat are in movable contact. The upper end face of the upper grinding seat is provided with a feeding groove, and the groove wall is provided with a plurality of feeding holes. The lower end face of the upper grinding seat is provided with a conical cavity, and the feeding groove is connected to the conical cavity through the feeding holes. A plurality of first protrusions are fixedly provided inside the conical cavity. The upper end face of the lower grinding seat is fixedly provided with a conical seat, which is located inside the conical cavity. A plurality of second protrusions are fixedly provided on the outer wall of the conical seat, and the second protrusions are staggered from the first protrusions. A plurality of discharge holes are provided at the edge of the lower grinding seat.

[0021] Preferably, a first transmission rod is rotatably installed in the inner cavity of the processing tank, a first bevel gear is fixedly installed at one end of the first transmission rod, a first rotating shaft is rotatably installed in the inner cavity of the processing tank, a second bevel gear is fixedly installed at one end of the first rotating shaft, the first bevel gear and the second bevel gear are meshed and connected, and a connecting frame is fixedly installed at the other end of the first rotating shaft, the connecting frame is fixedly installed on the upper end face of the upper grinding seat;

[0022] A second transmission rod is rotatably installed inside the processing tank. A third bevel gear is fixedly installed at one end of the second transmission rod. A second rotating shaft is rotatably installed inside the collection hopper. One end of the second rotating shaft is fixedly connected to the lower end face of the lower grinding seat. A fourth bevel gear is fixedly installed in the middle of the second rotating shaft. The fourth bevel gear is mirror-image of the second bevel gear. The third bevel gear is meshed with the fourth bevel gear.

[0023] Preferably, a triangular guide plate is fixedly installed in the inner cavity of the processing tank, and one end of the first rotating shaft is rotatably installed in the triangular guide plate.

[0024] Preferably, a first transmission wheel is fixedly installed at one end of one of the crushing rollers and the other end of the first transmission rod, and a first toothed belt is installed between the two first transmission wheels. A second transmission wheel is fixedly installed at the other end of the first transmission rod and the other end of the second transmission rod, and a second toothed belt is installed between the two second transmission wheels.

[0025] Preferably, the screening mechanism includes a sieve plate, which is detachably installed at the bottom of the collection hopper. A fixed seat is fixedly provided at the other end of the second rotating shaft. Several scraper strips arranged in a ring array are fixedly provided on the outer wall of the fixed seat. The lower surface of the scraper strips is in contact with the upper surface of the sieve plate.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. In the process of improving soil in karst areas with heavy metal pollution, different proportions of heavy metal soil conditioner are injected into holes of different depths through a layered injection process. The soil is improved separately according to the heavy metal pollution situation, thereby improving the remediation effect of karst soil.

[0028] 2. In this invention, a grinding device consisting of a crushing mechanism, a grinding mechanism, and a screening mechanism is used. During the grinding process of phosphate lime, the two crushing rollers in the crushing mechanism crush the phosphate lime, the first and second protrusions in the grinding mechanism rotate synchronously in opposite directions to grind the crushed phosphate lime, and the sieve plate in the screening mechanism screens the ground phosphate lime particles synchronously. This process can obtain the phosphate lime particles required for the preparation of heavy metal soil conditioner, thereby improving the preparation efficiency of heavy metal soil conditioner.

[0029] 3. In this invention, the scraper in the screening mechanism is driven to rotate synchronously during the screening process. The scraper causes the phosphate lime particles accumulated above the screen plate to move, preventing the phosphate lime particles from accumulating in one place on the surface of the screen plate and causing the screen holes of the screen plate to be blocked, thus ensuring the normal operation of the screening operation. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a process flow diagram of a soil remediation technology for heavy metal karst areas according to the present invention.

[0032] Figure 2 This is a process flow diagram of the product preparation method for a soil remediation technology for heavy metal karst areas according to the present invention.

[0033] Figure 3 This is a schematic diagram of the grinding equipment of the present invention.

[0034] Figure 4 This is a cross-sectional structural diagram of the processing tank of the present invention.

[0035] Figure 5 This is a schematic diagram of the crushing and grinding mechanisms of the present invention.

[0036] Figure 6 This is a cross-sectional schematic diagram of the separation of the upper and lower grinding seats and the collection hopper of the present invention.

[0037] Figure 7This is a schematic diagram of the structure of the grinding seat of the present invention.

[0038] Figure 8 This is a schematic diagram of the screening mechanism of the present invention.

[0039] In the diagram: 1. Processing tank; 11. Storage hopper; 12. Guide hopper; 13. Collection hopper; 14. Support frame; 15. Inspection door panel; 2. Crushing mechanism; 21. Crushing roller; 22. Transmission gear; 23. Servo motor; 3. Grinding mechanism; 31. Lower grinding seat; 32. Upper grinding seat; 33. Feed chute; 34. Feed hole; 35. Conical cavity; 36. Protrusion No. 1; 37. Conical seat; 38. Protrusion No. 2; 39. Discharge 4. Hole; 4. Transmission rod No. 1; 41. Bevel gear No. 1; 42. Rotating shaft No. 1; 421. Triangular guide plate; 43. Bevel gear No. 2; 44. Connecting frame; 45. Transmission rod No. 2; 46. Bevel gear No. 3; 47. Rotating shaft No. 2; 48. Bevel gear No. 4; 49. Transmission wheel No. 1; 5. Toothed belt No. 1; 51. Transmission wheel No. 2; 52. Toothed belt No. 2; 7. Screening mechanism; 71. Screen plate; 72. Fixed seat; 73. Scraper bar. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Example: Figure 1-8 As shown, this invention provides a soil remediation technology for heavy metal karst areas, comprising the following steps:

[0042] S1. Drill holes in the karst area using drilling equipment, drilling to the target layer, bringing out soil samples of different depths during the drilling operation, and forming holes of different depths in the karst area at the same time.

[0043] S2. Analyze the soil stone blocks, analyze the heavy metal composition and content in the soil blocks, and mark them. Mark the corresponding pores of each soil block and the heavy metal data of the soil blocks.

[0044] S3. Based on the heavy metal composition and content of the marked soil samples, different types of heavy metal soil conditioners are prepared. Through a layered injection process, different types of heavy metal soil conditioners are injected one by one into multiple holes of different depths. The heavy metal soil conditioners seep in and diffuse along the gaps in the holes, increasing the pH value of the soil, causing heavy metal ions to precipitate, and reducing the degree of heavy metal pollution in the karst area soil.

[0045] This invention also provides a product preparation method for soil remediation technology in karst areas contaminated with heavy metals. The preparation method of the heavy metal soil conditioner includes the following steps:

[0046] S1. Add phosphate lime to the grinding equipment for grinding, while simultaneously pyrolyzing the straw, and then use potassium hydroxide to impregnate and activate the pyrolyzed straw.

[0047] S2. Mix iron tailings and potassium hydroxide in a ratio of 4:1, and calcine them at high temperature in a muffle furnace for 2-3 hours for later use.

[0048] S3. Add the ground phosphate lime, impregnated and activated straw and iron tailings to the mixing equipment, and add compound microbial agent and binder at the same time. After mixing evenly, put it into a constant temperature incubator for constant temperature incubation for 30-36 hours.

[0049] S4. Add the semi-finished material that has been cultured at a constant temperature to the granulation equipment, and granulate it into 1-3 mm particles to obtain the heavy metal soil conditioner.

[0050] The grinding equipment includes a processing tank 1. A storage hopper 11 is fixedly installed at one end of the processing tank 1, where the phosphate lime to be ground can be temporarily stored. A guide hopper 12 and a collection hopper 13 are fixedly installed from top to bottom inside the processing tank 1. Through the guide hopper 12 and collection hopper 13, the crushed phosphate lime can fall downwards through the guide hopper 12, and the crushed and ground phosphate lime can be collected in the collection hopper 13. Several support frames 14 are fixedly installed at the other end of the processing tank 1, and an inspection door 15 is hinged to the other end of the processing tank 1. The door panel 15 facilitates maintenance operations. The inner cavity of the treatment tank 1 is equipped with a crushing mechanism 2, a grinding mechanism 3, and a screening mechanism 7 from top to bottom. By setting up the crushing mechanism 2, the grinding mechanism 3, and the screening mechanism 7, the crushing mechanism 2 can crush the phosphate lime, the grinding mechanism 3 can grind the crushed phosphate lime, and the screening mechanism 7 can screen the ground phosphate lime to screen out phosphate lime particles that meet the mesh size requirements. The guide bucket 12 is located between the crushing mechanism 2 and the grinding mechanism 3, and the collection bucket 13 is located between the grinding mechanism 3 and the screening mechanism 7.

[0051] The crushing mechanism 2 includes two crushing rollers 21, which are rotatably installed in the inner cavity of the processing tank 1. By driving the two crushing rollers 21 to rotate synchronously in opposite directions, the phosphate lime in the storage hopper 11 can be crushed after falling above the two crushing rollers 21. A transmission gear 22 is fixedly installed at one end of each of the two crushing rollers 21. The two transmission gears 22 are meshed and connected. By setting the two transmission gears 22, the two crushing rollers 21 can be kept rotating synchronously in opposite directions by the transmission of the two transmission gears 22. A servo motor 23 is fixedly installed at one end of the processing tank 1. The drive output end of the servo motor 23 is fixedly connected to one end of one of the crushing rollers 21. By starting the servo motor 23, the drive shaft of the servo motor 23 can make the crushing roller 21 rotate.

[0052] The grinding mechanism 3 includes a lower grinding seat 31 and an upper grinding seat 32. By driving the lower grinding seat 31 and the upper grinding seat 32 to rotate, the crushed phosphate lime can be ground when it is located between the lower grinding seat 31 and the upper grinding seat 32. The lower grinding seat 31 and the upper grinding seat 32 are located below the guide bucket 12. The lower end face of the upper grinding seat 32 is in contact with the upper end face of the lower grinding seat 31. The upper end face of the upper grinding seat 32 is provided with a feeding groove 33. The groove wall of the feeding groove 33 is provided with several feeding holes 34. The lower end face of the upper grinding seat 32 is provided with a conical cavity 35. The feeding groove 33 is connected to the conical cavity 35 through the feeding holes 34. By providing the feeding groove 33 and the feeding holes 34, the crushed phosphate lime can fall into the feeding groove 33 through the guide bucket 12. The phosphate lime in the feeding groove 33... The material can fall into the conical cavity 35 through the feed hole 34. Several first protrusions 36 are fixedly arranged inside the conical cavity 35. A conical seat 37 is fixedly arranged on the upper end face of the lower grinding seat 31. The conical seat 37 is located inside the conical cavity 35. Several second protrusions 38 are fixedly arranged on the outer wall of the conical seat 37. The second protrusions 38 are staggered from the first protrusions 36. By driving the lower grinding seat 31 and the upper grinding seat 32 to rotate synchronously in opposite directions, the first protrusions 36 and the second protrusions 38 can be rotated synchronously in opposite directions. The synchronous opposite rotation of the first protrusions 36 and the second protrusions 38 can grind the phosphate lime entering the conical cavity 35. Several discharge holes 39 are provided at the edge of the lower grinding seat 31. By providing discharge holes 39, the ground phosphate lime particles can fall downward into the collection hopper 13 through the discharge holes 39.

[0053] A transmission rod 4 is rotatably installed in the inner cavity of the processing tank 1. A bevel gear 41 is fixedly installed at one end of the transmission rod 4. A rotating shaft 42 is rotatably installed in the inner cavity of the processing tank 1. A bevel gear 43 is fixedly installed at one end of the rotating shaft 42. The bevel gear 41 and the bevel gear 43 mesh with each other. A connecting frame 44 is fixedly installed at the other end of the rotating shaft 42. The connecting frame 44 is fixedly installed on the upper end face of the upper grinding seat 32. By driving the transmission rod 4 to rotate, the transmission rod 4 can cause the rotating shaft 42 to rotate through the meshing of the bevel gear 41 and the bevel gear 43. The rotating shaft 42 can cause the upper grinding seat 32 to rotate through the connecting frame 44.

[0054] A second transmission rod 45 is rotatably installed inside the inner cavity of the processing tank 1. A third bevel gear 46 is fixedly installed at one end of the second transmission rod 45. A second rotating shaft 47 is rotatably installed inside the collection hopper 13. One end of the second rotating shaft 47 is fixedly connected to the lower end face of the lower grinding seat 31. A fourth bevel gear 48 is fixedly installed in the middle of the second rotating shaft 47. The fourth bevel gear 48 is mirror-image of the second bevel gear 43. The third bevel gear 46 is meshed with the fourth bevel gear 48. By driving the second transmission rod 45 to rotate, the second transmission rod 45 can cause the second rotating shaft 47 to rotate through the third bevel gear 46 and the fourth bevel gear 48. The second rotating shaft 47 can cause the lower grinding seat 31 to rotate. Since the fourth bevel gear 48 is mirror-image of the second bevel gear 43, the rotation direction of the lower grinding seat 31 is opposite to that of the upper grinding seat 32.

[0055] A triangular guide plate 421 is fixedly installed in the inner cavity of the processing tank 1. One end of the first rotating shaft 42 is rotatably installed in the triangular guide plate 421. By setting the triangular guide plate 421, the triangular guide plate 421 can protect the first bevel gear 41 and the second bevel gear 43. At the same time, the phosphate lime falling down through the guide bucket 12 can fall into the feed trough 33 along the triangular guide plate 421.

[0056] One end of one crushing roller 21 and the other end of the first transmission rod 4 are both fixedly equipped with a first transmission wheel 49. A first toothed belt 5 is installed between the two first transmission wheels 49. A second transmission wheel 51 is fixedly installed at the other end of the first transmission rod 4 and the other end of the second transmission rod 45. A second toothed belt 52 is installed between the two second transmission wheels 51. When the crushing roller 21 rotates, the crushing roller 21 can cause the first transmission rod 4 to rotate through the two first transmission wheels 49 and the first toothed belt 5. The first transmission rod 4 can cause the second transmission rod 45 to rotate through the two second transmission wheels 51 and the second toothed belt 52.

[0057] The screening mechanism 7 includes a screen plate 71, which is detachably mounted on the bottom of the collection hopper 13 by bolts. By setting the screen plate 71 and bolting it to the bottom of the collection hopper 13, the screen plate 71 can be disassembled after opening the inspection door 15, facilitating the replacement of screen plates 71 with different mesh sizes. It also allows the removal of the phosphate lime above the screen plate 71. When the ground phosphate lime falls into the collection hopper 13, it is screened by the screen plate 71. The screened phosphate lime particles are discharged outwards through the bottom of the processing tank 1. A fixed base 72 is fixedly installed at the other end of the shaft 47. Several scraper strips 73 are fixedly arranged in a ring array on the outer wall of the fixed base 72. The lower surface of the scraper strips 73 is in contact with the upper surface of the sieve plate 71. By setting the scraper strips 73, when the second rotating shaft 47 rotates, the second rotating shaft 47 can make the scraper strips 73 rotate. The scraper strips 73 can make the phosphate lime particles accumulated above the sieve plate 71 move, so as to avoid the phosphate lime particles accumulating in one place on the upper surface of the sieve plate 71 and causing the sieve holes of the sieve plate 71 to be blocked, thus ensuring the normal operation of the screening operation.

[0058] Working principle: In the process of preparing heavy metal soil conditioner, when it is necessary to grind phosphate lime to the required mesh size, the operator first adds the phosphate lime to be ground into the storage hopper 11.

[0059] At the same time, the operator starts the servo motor 23. The drive shaft of the servo motor 23 causes the corresponding crushing roller 21 to rotate. One crushing roller 21 is driven by two transmission gears 22, causing the other crushing roller 21 to rotate synchronously in the opposite direction. The phosphate lime in the storage hopper 11 falls above the two crushing rollers 21 and is crushed under the action of the synchronous reverse rotation of the two crushing rollers 21.

[0060] The crushed phosphate lime falls into the feed trough 33 through the guide bucket 12 and enters the conical cavity 35 through the feed hole 34, and is distributed between the first protrusion 36 and the second protrusion 38. At the same time, one of the crushing rollers 21 rotates the first transmission rod 4 through two first transmission wheels 49 and the first toothed belt 5. The first transmission rod 4 rotates the second transmission rod 45 through two second transmission wheels 51 and the second toothed belt 52. The first transmission rod 4 rotates the first rotating shaft 42 through the first bevel gear 41 and the second bevel gear 43. The first rotating shaft 42 rotates the upper grinding seat 32 through the connecting frame 44. The second transmission rod 45 rotates the second rotating shaft 47 through the third bevel gear 46 and the fourth bevel gear 48. The second rotating shaft 47 rotates the lower grinding seat 31, and the lower grinding seat 31 and the upper grinding seat 32 rotate synchronously in opposite directions.

[0061] At this time, the first protrusion 36 and the second protrusion 38 are in a state of synchronous reverse rotation. The synchronous reverse rotation of the first protrusion 36 and the second protrusion 38 work together to grind the phosphate lime that enters the conical cavity 35 into phosphate lime particles. The phosphate lime particles fall downward into the collection hopper 13 through the discharge hole 39.

[0062] Meanwhile, the sieve plate 71 screens the phosphate lime particles entering the collection hopper 13. Phosphate lime particles smaller than the mesh size of the sieve plate 71 are discharged downwards, while phosphate lime particles larger than the mesh size of the sieve plate 71 remain on the sieve plate 71. At the same time, the second rotating shaft 47 rotates the scraper 73 through the fixed seat 72. The scraper 73 moves the phosphate lime particles accumulated above the sieve plate 71, preventing the phosphate lime particles from accumulating in one place on the upper surface of the sieve plate 71 and causing the sieve holes of the sieve plate 71 to be blocked, thus ensuring the normal operation of the screening.

[0063] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A soil remediation technology for heavy metal karst areas, characterized in that, Includes the following steps: S1. Drill holes in the karst area using drilling equipment, drilling to the target layer, bringing out soil samples of different depths during the drilling operation, and forming holes of different depths in the karst area at the same time. S2. Analyze the soil stone blocks, analyze the heavy metal composition and content in the soil blocks, and mark them. Mark the corresponding pores of each soil block and the heavy metal data of the soil blocks. S3. Based on the heavy metal composition and content of the marked soil samples, different types of heavy metal soil conditioners are prepared. Through a layered injection process, different types of heavy metal soil conditioners are injected one by one into multiple holes of different depths. The heavy metal soil conditioners seep in and diffuse along the gaps in the holes, increasing the pH value of the soil, causing heavy metal ions to precipitate, and reducing the degree of heavy metal pollution in the karst area soil.

2. A method for preparing a product applicable to the soil remediation technology for heavy metal karst area pollution as described in claim 1, characterized in that, The preparation method of the heavy metal soil conditioner includes the following steps: S1. Add phosphate lime to the grinding equipment for grinding, while simultaneously pyrolyzing the straw, and then use potassium hydroxide to impregnate and activate the pyrolyzed straw. S2. Mix iron tailings and potassium hydroxide in a ratio of 4:1, and calcine them at high temperature in a muffle furnace for 2-3 hours for later use. S3. Add the ground phosphate lime, impregnated and activated straw and iron tailings to the mixing equipment, and add compound microbial agent and binder at the same time. After mixing evenly, put it into a constant temperature incubator for constant temperature incubation for 30-36 hours. S4. Add the semi-finished material that has been cultured at a constant temperature to the granulation equipment, and granulate it into 1-3 mm particles to obtain the heavy metal soil conditioner.

3. The product preparation method for a soil remediation technology for heavy metal karst areas as described in claim 2, characterized in that, The grinding equipment includes a processing tank (1), a storage hopper (11) is fixedly provided at one end of the processing tank (1), a guide hopper (12) and a collection hopper (13) are fixedly provided from top to bottom in the inner cavity of the processing tank (1), a crushing mechanism (2), a grinding mechanism (3) and a screening mechanism (7) are provided from top to bottom in the inner cavity of the processing tank (1), the guide hopper (12) is located between the crushing mechanism (2) and the grinding mechanism (3), and the collection hopper (13) is located between the grinding mechanism (3) and the screening mechanism (7).

4. The product preparation method for a soil remediation technology for heavy metal karst areas as described in claim 3, characterized in that, Several support frames (14) are fixedly installed at the other end of the treatment tank (1), and an inspection door panel (15) is hinged to the other end of the treatment tank (1).

5. The product preparation method for a soil remediation technology for heavy metal karst areas as described in claim 3, characterized in that, The crushing mechanism (2) includes two crushing rollers (21). The two crushing rollers (21) are rotatably installed in the inner cavity of the processing tank (1). A transmission gear (22) is fixedly installed at one end of each of the two crushing rollers (21). The two transmission gears (22) are meshed and connected. A servo motor (23) is fixedly installed at one end of the processing tank (1). The drive output end of the servo motor (23) is fixedly connected to one end of one of the crushing rollers (21).

6. The product preparation method for a soil remediation technology for heavy metal karst areas as described in claim 5, characterized in that, The grinding mechanism (3) includes a lower grinding seat (31) and an upper grinding seat (32). The lower grinding seat (31) and the upper grinding seat (32) are located below the guide bucket (12). The lower end face of the upper grinding seat (32) is in contact with the upper end face of the lower grinding seat (31). The upper end face of the upper grinding seat (32) is provided with a feed groove (33). The feed groove (33) has a plurality of feed holes (34) on its wall. The lower end face of the upper grinding seat (32) is provided with a conical cavity (35). 3) The feed hole (34) is connected to the conical cavity (35). Several No. 1 protrusions (36) are fixedly arranged in the conical cavity (35). A conical seat (37) is fixedly arranged on the upper end face of the lower grinding seat (31). The conical seat (37) is located in the conical cavity (35). Several No. 2 protrusions (38) are fixedly arranged on the outer wall of the conical seat (37). The No. 2 protrusions (38) are staggered from the No. 1 protrusions (36). Several discharge holes (39) are arranged at the edge of the lower grinding seat (31).

7. The product preparation method for a soil remediation technology for heavy metal karst areas as described in claim 6, characterized in that, A transmission rod (4) is rotatably installed in the inner cavity of the processing tank (1). A bevel gear (41) is fixedly installed at one end of the transmission rod (4). A rotating shaft (42) is rotatably installed in the inner cavity of the processing tank (1). A bevel gear (43) is fixedly installed at one end of the rotating shaft (42). The bevel gear (41) and the bevel gear (43) are meshed and connected. A connecting frame (44) is fixedly installed at the other end of the rotating shaft (42). The connecting frame (44) is fixedly installed on the upper end face of the upper grinding seat (32). The processing tank (1) is also rotatably installed with a second transmission rod (45). A third bevel gear (46) is fixedly installed at one end of the second transmission rod (45). A second rotating shaft (47) is rotatably installed inside the collection hopper (13). One end of the second rotating shaft (47) is fixedly connected to the lower end face of the lower grinding seat (31). A fourth bevel gear (48) is fixedly installed in the middle of the second rotating shaft (47). The fourth bevel gear (48) is mirrored with the second bevel gear (43). The third bevel gear (46) meshes with the fourth bevel gear (48).

8. The product preparation method for a soil remediation technology for heavy metal karst areas as described in claim 7, characterized in that, A triangular guide plate (421) is fixedly installed in the inner cavity of the processing tank (1), and one end of the first rotating shaft (42) is rotatably installed in the triangular guide plate (421).

9. The product preparation method for a soil remediation technology for heavy metal karst areas as described in claim 7, characterized in that, One end of one of the crushing rollers (21) and the other end of the first transmission rod (4) are fixedly provided with a first transmission wheel (49). A first toothed belt (5) is installed between the two first transmission wheels (49). A second transmission wheel (51) is fixedly provided at the other end of the first transmission rod (4) and the other end of the second transmission rod (45). A second toothed belt (52) is installed between the two second transmission wheels (51).

10. The product preparation method for a soil remediation technology for heavy metal karst areas as described in claim 7, characterized in that, The screening mechanism (7) includes a sieve plate (71), which is detachably installed at the bottom of the collection hopper (13). The other end of the second rotating shaft (47) is fixedly provided with a fixed seat (72). Several scraper strips (73) arranged in a ring array are fixedly provided on the outer wall of the fixed seat (72). The lower surface of the scraper strips (73) and the upper surface of the sieve plate (71) are in active contact.

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