CN116441294A - Soil remediation method and soil remediation equipment - Google Patents

Abstract

The invention relates to the field of soil remediation, and discloses a soil remediation method and soil remediation equipment. The soil remediation method includes the following steps: S1, performing primary screening on the soil to screen the cohesive blocks and stones in the soil In addition to forming coarse-grained soil; S2, adding medicine to the coarse-grained soil, mixing and stirring, and performing secondary screening on the coarse-grained soil after mixing and stirring the medicine, to form small particles by screening out intermediate particles in the coarse-grained soil Soil; S3, performing three-stage sieving on the small-grained soil, sieving out fine particles in the small-grained soil, and forming powdery fine soil. The invention solves the technical problem that the soil to be repaired is difficult to mix uniformly with the soil due to high soil viscosity or a large amount of stones in the soil, resulting in poor repairing effect.

Description

Soil remediation method and soil remediation equipment

technical field

The invention relates to the field of soil restoration, in particular to a soil restoration method and soil restoration equipment.

Background technique

Heavy metal pollution is the main problem of soil pollution in my country at present. Heavy metal-contaminated soil remediation technologies include solidification and stabilization, soil leaching, cement kiln coordination, barrier landfill, electric restoration, phytoremediation and other technical means. In actual engineering, solidification and stabilization technology is currently the most commonly used method for remediating heavy metal-contaminated soil. One of the technical means, solidification and stabilization technology refers to the addition of solidification and stabilization agents to heavy metal-contaminated soil, which is fully mixed after stirring by engineering machinery, so that the agents and heavy metals in the contaminated soil have physical and chemical interactions, and the heavy metals are immobilized. In the dense low-permeability solidified body, the form of heavy metals may be changed to reduce their mobility in the environment, so as to achieve the purpose of remediation of contaminated soil.

Most of the existing equipment directly adds contaminated soil into the equipment, and then adds chemicals to the contaminated soil in the device to achieve contaminated soil remediation. In my country's Yunnan, Guangxi, Guizhou and other regions, the main landform is karst, and there are many stones in the excavated soil. The existing equipment cannot process the stones synchronously. Mainly, for highly clay-contaminated soil, due to its high soil viscosity, it is difficult for existing equipment to fully mix the agent with the soil, resulting in poor remediation effects.

Contents of the invention

The purpose of the present invention is to overcome the technical problems existing in the prior art that the soil to be repaired is highly viscous or contains a large number of stones, which makes it difficult to mix the medicament and the soil evenly and the repairing effect is not good.

In order to achieve the above object, the present invention provides a soil remediation method.

Described soil remediation method comprises the following steps:

S1, primary sieving of the soil to remove the cohesive blocks and stones in the soil to form coarse-grained soil;

S2, adding medicine to the coarse-grained soil, mixing and stirring, and performing secondary screening on the coarse-grained soil after mixing and stirring the medicine, so as to screen out intermediate particles in the coarse-grained soil to form small-grained soil;

S3, performing three-stage sieving on the small granular soil, sieving fine particles in the small granular soil to form powdery fine soil.

In the soil remediation method provided by the present invention, the cohesive blocks and stones in the soil are screened out to form coarse-grained soil by primary screening of the soil, and then drugs are added to the coarse-grained soil for mixing and stirring to screen out the coarse-grained soil. The medium-level particles form small-grained soil. During the screening process, the drug and coarse-grained soil are further mixed and stirred. Finally, the small-grained soil is subjected to three-stage sieving, and the fine particles in the small-grained soil are screened out to form powdery fine-grained soil. Soil, using the above-mentioned three-stage sieving, effectively removes the cohesive blocks and stones in the soil, mixes and multi-stage sieves the coarse-grained soil after the sieving, and multi-stage sieving The process is conducive to further crushing the coarse-grained soil, so that it can be fully mixed with the drug, thereby reducing the situation that the soil is not easy to mix with the drug due to high soil viscosity, and thus solves the problem of the soil to be repaired. The soil is highly viscous or the soil contains a lot of stones, which makes it difficult to mix the agent and the soil evenly, and the repair effect is not good.

Preferably, the step S1 further includes sieving and washing the cohesive lumps and stones obtained through primary screening, so as to clean the stones, and pulverizing the cohesive lumps to form the coarse-grained soil.

Preferably, the step S3 further includes pulverizing the secondary sieved intermediate particles and/or the tertiary sieved fine particles to form powdery fine soil.

Preferably, the soil remediation method further includes step S4, performing composition detection on the powdery fine soil to determine whether the preset soil remediation standard is met, and judging whether to perform secondary addition and mixing of drugs according to the composition detection results Stir.

A second aspect of the invention provides a soil remediation device.

The soil remediation equipment comprises a feeder, a coarse sieving machine, a dosing device, an agitating sieving machine and a fine sieving machine, the feeder is used to supply soil to the coarse sieving machine, and the coarse sieving The extension machine sieves the cohesive blocks and stones in the soil to form coarse-grained soil and then transports it to the stirring and screening machine. The dosing device is used to add medicine to the coarse-grained soil, and the stirring and screening machine is used to Stir the coarse-grained soil after medicine and sieve the intermediate particles in the coarse-grained soil to form small-grained soil, and the fine-grained sieving machine is used to screen out fine particles in the small-grained soil to form powdery fine soil.

Preferably, the coarse screening machine and the stirring and screening machine are arranged at intervals in the horizontal direction, and the soil remediation equipment further includes a first conveyor belt arranged between the coarse screening machine and the stirring and screening machine, The dosing device is arranged adjacent to the first conveyor belt to add medicine to the coarse-grained soil on the first conveyor belt; and/or

The stirring and screening machine and the fine particle screening machine are arranged at intervals in the horizontal direction, and the soil remediation equipment further includes a second conveyor belt arranged between the stirring and screening machine and the fine particle screening machine.

Preferably, the soil remediation equipment includes a fourth conveyor belt for transporting the cohesive pieces and stones screened out of the soil and for crushing the cohesive pieces and/or washing the stones The processed washing and screening machine, the fourth conveyor belt connects the coarse grain screening machine and the washing and screening machine.

Preferably, the soil remediation equipment includes at least one of the following methods:

Mode 1, the first conveyor belt is inclined upwardly from one side of the coarse screening machine to one side of the stirring and screening machine, and the angle between the first conveyor belt and the horizontal plane is 8-15°;

Mode 2, the second conveyor belt includes a horizontal section and an inclined section sequentially arranged along its conveying direction, and the angle between the inclined section of the second conveyor belt and the horizontal plane is 10-20°;

Mode 3, the fourth conveyor belt is transported obliquely upward from one side of the coarse screening machine to one side of the washing and screening machine, and the included angle between the fourth conveyor belt and the horizontal plane is 10-20°;

Mode 4, the soil remediation equipment includes a plurality of fine particle screening machines arranged in parallel, and the port of the second conveyor belt close to the fine particle screening machines is provided with a device for simultaneously feeding multiple fine particle screening machines Equalizing device for soil distribution and conveying.

Preferably, the soil remediation equipment includes a fifth conveyor belt for transporting the intermediate particles screened out by the stirring and screening machine and/or the fine particles screened out by the fine screening machine and And/or the crusher for crushing the fine particles, the fifth conveyor belt is at least used to connect the fine particle screening machine and the crusher.

Preferably, the soil remediation equipment includes a sixth conveyor belt, the sixth conveyor belt connects the crusher and the third conveyor belt, and is used to transport the crushed powdery fine soil outward, and the sixth conveyor belt is in a horizontal direction;

Preferably, the soil remediation equipment includes a third conveyor belt, one end of the third conveyor belt is connected to the fine particle screening machine, and is used to transport the powdery fine soil outward;

Preferably, at least two said third conveyor belts arranged in parallel;

Preferably, the soil remediation equipment includes a gantry crane for adjusting the height of the end position of the conveying end of the third conveyor belt;

Preferably, the third conveyor belt is conveyed obliquely upward from one side of the fine particle screening machine to the outside, and the included angle between the third conveyor belt and the horizontal plane is 8-15°.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the soil remediation equipment provided by the present invention in practical application.

Explanation of reference signs

1. Feeder; 2. Coarse screening machine; 3. Dosing device; 4. Stirring and screening machine; 5. Fine screening machine; 6. The first conveyor belt; 7. The second conveyor belt; 8. The third conveyor belt; 9. The fourth conveyor belt; 10. Washing and screening machine; 11. The fifth conveyor belt; 12. Crusher; 13. Gantry crane; 14. Transport vehicle; 15. Trolley; 16. The sixth conveyor belt.

Detailed ways

Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The detailed description and accompanying drawings of the following embodiments are used to illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention. The present invention can be realized in many different forms, and is not limited to the specific embodiments disclosed herein. Rather, it includes all technical solutions falling within the scope of the claims.

These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It should be noted that unless specifically stated otherwise, the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments should be interpreted as illustrative only and not as limiting.

It should be noted that, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is greater than or equal to two; Or the positional relationship is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

In addition, "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error. Words like "comprising" or "comprising" mean that the elements preceding the word cover the elements listed after the word, and do not exclude the possibility of also covering other elements.

It should also be noted that, in the description of the present invention, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Disassembled connection, or integral connection; it can be directly connected or indirectly connected through an intermediary. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. When it is described that a specific device is located between a first device and a second device, there may or may not be an intervening device between the specific device and the first device or the second device.

All terms used in the present invention have the same meaning as understood by those of ordinary skill in the art to which the present invention belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, general-purpose dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in idealized or extremely formalized meanings, unless explicitly stated herein Defined like this.

Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, techniques, methods and devices should be considered part of the description.

The invention provides a soil restoration method, which can be used for the stabilization and restoration of high-clay heavy metal-contaminated soil, specifically comprising the following steps:

S1, Preliminary sieving of the soil to remove cohesive pieces and stones in the soil to form coarse-grained soil; sieving the cohesive pieces and stones from the soil can avoid subsequent drug mixing process Adhesive blocks and stones adhere to drugs and cannot achieve the effect of soil mixing and restoration through the adhered drugs, which can effectively avoid the situation that the soil is not easy to stir and mix unevenly due to the presence of adhesive blocks and stones occur.

S2, add medicine to the coarse-grained soil and mix and stir, and carry out secondary screening to the coarse-grained soil after mixing and stirring the medicine, to form small-grained soil by screening out the intermediate particles in the coarse-grained soil; After the drug is mixed and re-screened, the coarse-grained soil can be collided and crushed during the screening process, so that it can be more fully integrated with the drug, and the mixing effect of the stirred coarse-grained soil and the drug can be further improved.

S3, performing three-stage sieving on the small-grained soil, sieving out fine particles in the small-grained soil, and forming powdery fine soil. Screening out the fine particles can ensure that the soil with higher viscosity can finally be mixed with the drug evenly at the preset soil particle size smaller than the fine particles to have a physical or chemical reaction, so as to achieve a better soil restoration effect.

Among them, the soil particle size of coarse-grained soil is not greater than 10cm, the soil particle size of small-grained soil is not greater than 5cm, and the soil particle size of powdery fine soil is not greater than 2cm. The size of the particles is greater than 10cm, the particle size of the intermediate particles is 5-10cm, and the particle size of the fine particles is 2-5cm.

In the soil remediation method provided by the present invention, the cohesive blocks and stones in the soil are screened out to form coarse-grained soil by primary screening of the soil, and then drugs are added to the coarse-grained soil for mixing and stirring to screen out the coarse-grained soil. The medium-level particles form small-grained soil. During the screening process, the drug and coarse-grained soil are further mixed and stirred. Finally, the small-grained soil is subjected to three-stage sieving, and the fine particles in the small-grained soil are screened out to form powdery fine-grained soil. Soil, using the above-mentioned three-stage sieving, effectively removes the cohesive blocks and stones in the soil, mixes and multi-stage sieves the coarse-grained soil after the sieving, and multi-stage sieving The process is conducive to further crushing the coarse-grained soil, so that it can be fully mixed with the drug, thereby reducing the situation that the soil is not easy to mix with the drug due to high soil viscosity, and thus solves the problem of the soil to be repaired. The soil is highly viscous or the soil contains a lot of stones, which makes it difficult to mix the agent and the soil evenly, and the repair effect is not good.

In an optional embodiment of the present invention, step S1 also includes washing and sieving the cohesive blocks and stones screened out from the primary screening, so as to clean the stones, and crushing the cohesive blocks to form coarse-grained soil for use in Subsequent soil processing. Sieving out the cohesive blocks and stones and then fully sieving can not only ensure that the soil is effectively repaired and utilized, but also avoid separate treatment of the sieved stones, reducing the process and cost of treatment.

In a further optional embodiment of the present invention, step S3 also includes pulverizing the intermediate fine particles screened out in the second stage and/or the fine particles screened out in the third stage to form powdery fine soil, which further increases the impact on the soil. Utilization improves the effect of restoration.

The present invention provides a kind of soil remediation equipment, as shown in Figure 1, the soil remediation equipment can be used for the stabilization and repair of high clay heavy metal contaminated soil, including a feeder 1, a coarse screening machine 2, a dosing device 3, a stirring screen Submachine 4 and fine grain screening machine 5, feeder 1 is used to supply soil to coarse grain screening machine 2, preferably, this feeder 1 is arranged on the upstream of coarse grain screening machine 2, and coarse grain screening machine 2 will be in the soil The cohesive blocks and stones are sieved to form coarse-grained soil and then transported to the stirring and screening machine 4. The dosing device 3 is used to add medicine to the coarse-grained soil, and the stirring and screening machine 4 is used to treat the coarse-grained soil after dosing. The granular soil is stirred and the intermediate particles in the coarse-grained soil are screened to form small granular soil, and the fine particle screening machine 5 is used to screen the fine particles in the small granular soil to form powdery fine soil.

The soil remediation equipment provided by the present invention utilizes the coarse-grained screening machine 2 to screen the soil supplied by the feeder 1 to remove cohesive blocks and stones to form coarse-grained soil, and then transport the coarse-grained soil to the stirring and screening machine 4, Add medicine to the coarse-grained soil by the dosing device 3 while transporting, and the stirring and screening machine 4 is used to stir the described coarse-grained soil after dosing, and sieve the coarse-grained soil to remove the coarse-grained soil. The medium-level particles in the granular soil form small granular soil, and the coarse-grained soil will be further broken into small particles of soil by collision during sieving, so as to further mix with the drug, improve the uniformity of mixing, and transport the small granular soil To the fine sieving machine for further sieving to form powdery fine soil, so as to ensure that the soil with higher viscosity can finally be mixed with the drug evenly with the preset soil particle size smaller than the fine particles to undergo physical or chemical reactions. And achieve better soil remediation effect. Furthermore, the technical problem that the soil to be repaired is difficult to mix evenly with the soil due to the high viscosity of the soil or the large amount of stones in the soil and poor repair effect is solved.

In an optional embodiment of the present invention, coarse-grained soil can be transported between the coarse screening machine 2 and the stirring and screening machine 4 through the setting of the upper and lower structures, that is, the discharge port of the coarse screening machine 2 corresponds to stirring The feeding port of the sieving machine 4, similarly stirs the sifting machine 4 and the fine particle sifting machine 5. In a preferred embodiment of the present invention, the coarse screening machine 2 and the mixing and screening machine 4 are arranged at intervals in the horizontal direction, and the soil remediation equipment also includes a first conveyor belt 6 arranged between the coarse screening machine 2 and the mixing and screening machine 4 , the dosing device 3 is arranged adjacent to the first conveyor belt 6 to add medicine to the coarse-grained soil on the first conveyor belt 6 . The specific dosing device 3 can be arranged above the first conveyor belt 6 , or can be arranged adjacent to one side of the first conveyor belt 6 . The mixing and screening machine 4 and the fine particle screening machine 5 are arranged at intervals in the horizontal direction, and the soil remediation equipment also includes a second conveyor belt 7 arranged between the stirring and screening machine 4 and the fine particle screening machine 5, so that the stirring and screening machine 4 is stirred And the intermediate granules in the coarse-grained soil are sieved to be processed to form small-grained soil and sent to the fine-grained screening machine 5 .

In an optional embodiment of the present invention, the soil remediation equipment includes a fourth conveyor belt 9 for transporting the cohesive pieces and stones screened out from the soil and a fourth conveyor belt 9 for destroying the cohesive pieces and/or washing the stones. Processed flushing and screening machine 10, the fourth conveyor belt 9 connects the coarse screening machine 2 and the flushing and screening machine 10, and the flushing and screening machine 10 carries out secondary pulverization to the cohesive block and soil clod screened out through the coarse screening machine 2, so that After the soil adhered to the stones or the soil forming a cohesive block is separated from the stones under the action of the washing and screening machine 10 or formed into smaller soil particles, that is, coarse-grained soil, it is again transported by the fourth conveyor belt 9 to the coarse screening machine 2 for secondary screening or manually transported to the coarse screening machine 2 or the first conveyor belt 6 to improve the efficiency of soil treatment. At the same time, the stones washed by the washing and screening machine 10 can be directly transported and stacked by the trolley 15 without secondary anti-pollution cleaning treatment, thereby reducing the treatment process of heavy metal soil containing a large number of stones and reducing the treatment cost.

Wherein, the coarse screening machine 2 can be a roller screening machine, the feeding port above the roller screening machine is located at the downstream of the feeder 1, the discharge port below the roller screening machine is located at the upstream of the first conveyor belt 6, and the fourth The conveyor belt 9 is arranged at the end of the rotating shaft transmission direction of the roller screening machine.

In an optional embodiment of the present invention, in order to ensure the transmission efficiency of the soil during transportation and treatment, the soil remediation equipment includes at least one of the following configurations:

Mode 1, the first conveyor belt 6 is transported obliquely upwards from one side of the coarse screening machine 2 to the side of the stirring and screening machine 4, and the angle between the first conveyor belt 6 and the horizontal plane is 8-15° to shorten the length of the coarse screening machine. The distance between the sub-machine 2 and the mixing and screening machine 4 is conducive to the accumulation and transportation of soil, thereby improving the efficiency of transportation;

Mode 2, the second conveyor belt 7 includes a horizontal section and an inclined section arranged in sequence along its conveying direction, and the second conveyor belt 7 is first conveyed along the horizontal direction, and then conveyed obliquely upwards, so as to extend the time of the mixed medicine soil passing through the second conveyer belt. 7 The time during the process of transporting to the fine particle screening machine 5 is conducive to the chemical reaction between the medicine and the heavy metals and other harmful substances in the soil. Further, the angle between the inclined section of the second conveyor belt and the horizontal plane is 10-20 °, which is conducive to the carrying and transmission of the second conveyor belt 7 to the soil;

Mode 3, the fourth conveyor belt 9 is transported obliquely upwards from one side of the coarse screening machine 2 to the side of the washing and screening machine 10, and the angle between the fourth conveyor belt 9 and the horizontal plane is 10-20°. Stones mixed with soil, therefore, the conveying slope of the fourth conveyer belt 9 can be higher than the first conveyer belt 6 and the third conveyer belt 8, so as to improve the efficiency of conveying, and shorten the setting distance from the coarse screening machine 2 to the washing and screening machine 10.

It should be noted that, in order to facilitate the mixing of the soil, the coarse sieving machine, stirring sieving machine and fine sifting machine are conventionally set so that the height of the feed port is higher than the height of the discharge port. The connection of the coarse sieving machine, the mixing sieving machine and the fine sifting machine needs to transport the soil from the outlet of the coarse sifting machine to the inlet of the mixing sieving machine, and then transport the soil from the outlet of the mixing sieving machine to the fine sieving machine. The feeding port of the grain screening machine, so the first conveyor belt set between the coarse grain screening machine and the mixing screen machine is set upwards, and the inclined section of the second conveyor belt set between the stirring screen machine and the fine grain screening machine is tilted upwards set up.

Mode 4, the soil remediation equipment includes a plurality of fine particle screening machines 5 arranged in parallel, and the port of the second conveyor belt 7 close to the fine particle screening machines 5 is provided with an equalizer for simultaneously distributing and transporting soil to a plurality of fine particle screening machines 5 . The device is used to improve the efficiency of drum screening of soil remediation equipment.

In an optional embodiment of the present invention, the soil remediation equipment includes the fifth conveyor belt 11 for transporting the intermediate particles screened out by the stirring and screening machine 4 and/or the fine particles screened out by the fine screening machine 5 and the intermediate particles and/or Or the crusher 12 for fine particle crushing treatment, the fifth conveyor belt 11 is at least used to connect the fine particle screening machine 5 and the crusher 12, so as to transport the fine particles screened out by the fine particle screening machine 5 to the crusher 12 for crushing, and The powdery fine soil processed by the crusher 12 can be transported to the third conveyor belt 8 through the sixth conveyor belt 16 to be transported to the outside. In a further optional embodiment of the present invention, the crusher 12 is a jaw crusher, and the crushing particle size of the crusher is not greater than 2 cm.

In an optional embodiment of the present invention, the soil remediation equipment includes a third conveyor belt, one end of the third conveyor belt is connected to the fine particle screening machine, and is used to transport powdery fine soil outward; the soil remediation equipment includes at least two parallel conveyor belts The third conveyor belt 8 is used to transport the processed powdery fine soil in the conveying place in the fine sieving machine 5 in batches. When there are two or more third conveyor belts 8 in parallel, it is adjacent to the crusher 12 The third conveyor belt 8 can be used to transport the powdery fine soil processed by the crusher 12 to the outside.

In an optional embodiment of the present invention, the angle between the third conveyor belt 8 and the horizontal plane is 8-15°, and the third conveyor belt 8 must extend obliquely upwards from one side of the fine particle screening machine 5 to the outside, so as to facilitate the processing The finished soil is delivered to the transport vehicle 14 parked on the end of the third conveyor belt 8, and the setting of the third conveyor belt 8 and the inclination angle of the horizontal plane helps to improve the delivery capacity of the soil after the treatment by the third conveyor belt 8 in unit time;

In an optional embodiment of the present invention, the soil remediation equipment includes a gantry crane 13, and the gantry crane 13 is arranged on the third conveyor belt 8 to adjust the height of the ramp of the third conveyor belt 8 to avoid dust generated during the soil discharging process. In a further optional embodiment of the present invention, the gantry crane 13 is arranged at the end of the third conveyor belt 8 away from the fine particle screening machine 5 .

In an optional embodiment of the present invention, the soil remediation equipment includes at least one of the following situations. In the first situation, the screening range of the coarse particle screening machine 2 is set to be no greater than 10cm, and the part exceeding 10cm is screened from coarse particles. The end of the screening machine 2 is transported to the washing and screening machine 10 by the fourth conveyor belt 9 for washing and screening, and the soil less than 10 cm sieved by the coarse screening machine 2 is transported to the Stirring and screening machine 4; in case two, the stirring and screening machine 4 is set to be able to sieve out particles greater than 5cm, wherein the stirring and screening machine 4 can be a soil-rubbing mixer, and the soil-rubbing mixer is correspondingly set to be able to screen particles larger than 5cm The 5cm particles are sifted out through the tail end of the toothed rake. During the process of kneading and stirring the soil by the toothed rake of the concrete rubbing soil mixer, since the larger particles will gradually deposit to the tail end of the toothed rake with stirring, it can be passed through The larger soil particles located at the tail end of the tooth rake of the soil rubbing mixer are removed by manual or mechanical cleaning, and the removed soil particles are moved to the washing and screening machine 10 or the crusher 12 for secondary processing to further form Soil fine particles that meet the requirements; situation three, the screening range of the fine particle screening machine 5 is set to be no more than 2cm, and the fine particle screening machine 5 receives the soil processed by the stirring and screening machine 4 to sieve, and the soil greater than 2cm The particles will be transported to the crusher 12 via the fifth conveyor belt 11 for crushing to form soil particles with particles less than 2cm. The soil particles less than 2cm move from the outlet end of the fine particle screening machine 5 to the third conveyor belt 8, and pass through the third conveyor belt 8. The conveyor belt 8 transports to the outside. Wherein, the fine particle screening machine 5 may be a drum screening machine.

After the soil maintenance through the soil maintenance equipment in the present invention is completed, it is detected whether the stabilization effect of heavy metals in the soil reaches the expected restoration goal, if the expected restoration goal is not reached, the soil maintenance equipment of the present invention is reused for further maintenance until Until the expected restoration goal is achieved.

In the preferred embodiment of the soil remediation equipment provided by the present invention:

The loader is used to transport the material to the feeder 1. The function of the feeder 1 is to evenly feed the material to the coarse screening machine 2. The feeder 1 transmits the material to the coarse screening machine 2 through a chain plate or a belt. The function of the coarse screening machine 2 is to separate the soil from the boulders, and the boulders with a diameter greater than 10 cm enter the washing and screening machine 10 through the fourth conveyor belt 9, and at the same time, the soil in the bulk is crushed in the washing and screening machine 10 to Below 10cm, the crushed soil first conveyor belt 6 of the coarse screening machine 2 enters the stirring and screening machine 4 . The crushed soil washed by the flushing and screening machine 10 can also be re-screened by the coarse screening machine 2 and then enter the stirring and screening machine 4 .

The crushed soil is conveyed to the mixing and screening machine 4 through the first conveyor belt 6. During the soil conveying process, it needs to pass through the dosing device 3. The function of the dosing device 3 is to evenly inject powdered stabilizing agents into the soil. The dosing device 3 can be composed of a silo and a medicine feeder. The silo is a material receiving device, and the operator manually feeds materials into the silo. The material in the silo is output by the medicine feeder, and the feeding volume can be controlled by the speed of the medicine feeder.

The soil after adding the medicament is transported to the mixing and screening machine 4. The function of the mixing and sifting machine 4 is to further rub the soil into small pieces of soil with a diameter less than 5cm, and mix and stir the soil and the medicament. Stones are sifted out.

The soil crushed by the stirring and screening machine 4 enters the fine particle screening machine 5 through the second conveyor belt 7, and the second conveyor belt 7 is provided with an equalizing device near the port of the fine particle screening machine 5, which can evenly distribute the soil to On two parallel fine particle screening machines 5. The function of the fine particle screening machine 5 is to further crush and screen the fine material crushed by the stirring and screening machine 4. The mesh aperture of the fine particle screening machine 5 is 2cm, and the soil or stones with a diameter greater than 2cm are passed through the fine particle screening machine. The tail discharge of 5 enters the crusher 12 through the fifth conveyor belt 11, and the fine material with a diameter less than 2cm falls into the third conveyor belt 8 located downstream of the discharge port of the fine particle screening machine 5, and is directly discharged, and finally transported by the transport vehicle 14 to conservation areas. The fine particle sieving machine 5 also has a further mixing and stirring function, which can fully mix the medicament and the soil evenly, and provide conditions for the next step of maintenance.

The gantry crane 13 mainly adjusts the height of the tail end of the third conveyor belt 8 to prevent dust and material jams. When the material stack is low or there is no material in the field, the gantry crane 13 should be lowered so that the third conveyor belt 8 is at the lowest limit. As the material stack increases , gradually lift the gantry crane 13, so that the height of the end of the third conveyor belt 8 close to the outside side rises, thereby gradually raising the discharge height. The lifting of the gantry crane 13 is regulated by an electric hoist. Press and hold the lift switch to control the height of the third conveyor belt 8. After lifting and lowering the height, a limiter should be inserted to lock the lifting of the third conveyor belt 8.

The soil or stones entering the crusher 12 are directly crushed into fine materials with a diameter of less than 2cm, then transported to the adjacent third conveyor belt 8 through the sixth conveyor belt 16, and finally sent to the discharge port, and finally transported by the transport vehicle 14 to conservation area.

In the actual use process, the coarse screening machine is selected from the roller screening machine, the mixing screening machine is selected from the soil mixer, and the fine screening machine is selected from the drum screening machine. The preferred operating parameters of the above-mentioned devices are:

The throughput of the roller screening machine is 200-300m ³ /h; the throughput of the washing and screening machine is 50-100m ³ /h; the feeding rate of the dosing device is 0-50m ³ /h; The processing capacity of the soil mixer is 200-250m ³ /h; the processing capacity of the drum screening machine is 150-200m ³ /h; the crusher is a jaw crusher, and the soil diameter after crushing is 0-2cm; the fourth conveyor belt 9 The width is 1.1m, the length is 2.0m, and the included angle with the horizontal plane is 10～20°, preferably 13～15°; the width of the first conveyor belt 6 is 0.8m, the length is 12.0m, and the included angle with the horizontal plane is 8～20°. 15°, preferably 10～12°; the second conveyor belt has a width of 0.8m, including a horizontal section and an inclined section, the length of the horizontal section is 3.0m, and the length of the inclined section is 16.0m, wherein the inclined section and the horizontal section The included angle of the segment is 10-20°, preferably 13-15°; the width of the fifth conveyor belt 11 is 0.6m, the length is 10.0m, and the included angle with the horizontal plane is 8-15°, preferably 10-13°. The position adjacent to the fifth conveyer belt can be provided with the sixth conveyer belt 16 for transporting the finely crushed soil after the crusher 12 to the third conveyer belt 8. The sixth conveyer belt 16 has a width of 0.6m and a length of 8.0m. , the angle with the horizontal plane is 0°; the width of the third conveyor belt 8 is 0.8m, the length is 11.5m, the angle with the horizontal plane is 8-15°, preferably 10-13°, and the tail end can be lifted by 1.5m.

So far, the embodiments of the present invention have been described in detail. Certain details well known in the art have not been described in order to avoid obscuring the inventive concept. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are for illustration only, rather than limiting the scope of the present invention. Those skilled in the art should understand that without departing from the scope and spirit of the present invention, the above embodiments can be modified or some technical features can be equivalently replaced. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner.

Claims (10)

1. a soil restoration method, is characterized in that, described soil restoration method comprises the following steps: S1, primary sieving of the soil to remove the cohesive blocks and stones in the soil to form coarse-grained soil; S2, adding medicine to the coarse-grained soil, mixing and stirring, and performing secondary screening on the coarse-grained soil after mixing and stirring the medicine, so as to screen out intermediate particles in the coarse-grained soil to form small-grained soil; S3, performing three-stage sieving on the small granular soil, sieving fine particles in the small granular soil to form powdery fine soil. 2. The soil remediation method according to claim 1, characterized in that, said step S1 also comprises: sieving and washing the cohesive blocks and stones that have been screened out in the primary stage, so as to clean the stones and remove the sticky The agglomerates are pulverized to form the coarse-grained soil. 3. The soil remediation method according to claim 1, characterized in that, said step S3 also includes pulverizing the intermediate particles screened out in the second stage and/or the fine particles screened out in the third stage to form powdery fine particles. earth. 4. The soil remediation method according to claim 1, characterized in that, the soil remediation method also includes step S4, the powdery fine soil is carried out to detect the composition to determine whether the preset soil remediation standard is reached, and according to the According to the test results of the above components, it is judged whether to carry out the secondary addition and mixing of the drug. 5. A kind of soil remediation equipment, it is characterized in that, described soil remediation equipment is suitable for according to the soil remediation method according to any one of claim 1 to 4, comprises feeding machine (1), coarse particle screening machine (2 ), a dosing device (3), a stirring and screening machine (4) and a fine screening machine (5), the feeder (1) is used to supply soil to the coarse screening machine (2), and the coarse The particle screening machine (2) screens out the cohesive blocks and stones in the soil to form coarse-grained soil and transports it to the stirring and screening machine (4), and the dosing device (3) is used to add medicine, the stirring and screening machine (4) is used to stir the coarse-grained soil after dosing and sieve the intermediate particles in the coarse-grained soil for processing to form small-grained soil, and the fine-grained screening machine (5) It is used to sieve fine particles in the small particle soil to form powdery fine soil. 6. soil remediation equipment according to claim 5, is characterized in that, described coarse screening machine (2) and described stirring and screening machine (4) are arranged at intervals in horizontal direction, and described soil remediation equipment also comprises setting The first conveyor belt (6) between the coarse screening machine (2) and the stirring and screening machine (4), the dosing device (3) is arranged adjacent to the first conveyor belt (6), so as to Coarse-grained soil on the first conveyor belt (6) adds medicine; and/or The stirring and screening machine (4) and the fine particle screening machine (5) are arranged at intervals in the horizontal direction, and the soil remediation equipment also includes the mixing and screening machine (4) and the fine particle screening machine ( 5) Between the second conveyor belt (7). 7. soil remediation equipment according to claim 6, is characterized in that, described soil remediation equipment comprises the 4th conveyer belt (9) that is used for transporting the cohesive block that sieves out in the described soil and stone and is used for A washing and screening machine (10) for crushing the cohesive blocks and/or washing and processing the stones, and the fourth conveyor belt (9) connects the coarse screening machine (2) and the washing and screening machine (10). 8. The soil remediation equipment according to claim 7, characterized in that, the soil remediation equipment comprises at least one of the following methods: Mode 1, the first conveyor belt (6) is inclined upward from one side of the coarse screening machine (2) to the side of the stirring and screening machine (4), and the first conveyor belt (6) is in contact with the horizontal plane. The included angle is 8-15°; Mode 2, the second conveyor belt (7) includes a horizontal section and an inclined section sequentially arranged along its conveying direction, and the included angle between the inclined section of the second conveyor belt (7) and the horizontal plane is 10-20°; Mode 3, the fourth conveyor belt (9) is inclined upwardly from one side of the coarse screening machine (2) to the side of the washing and screening machine (10), and the fourth conveyor belt (9) is in contact with the horizontal plane The included angle is 10-20°; Mode 4, the soil remediation equipment includes a plurality of fine particle screening machines (5) arranged in parallel, and the port of the second conveyor belt (7) near the fine particle screening machine (5) is provided for simultaneously feeding A plurality of fine particle screening machines (5) is an equalizing device for soil distribution and transportation. 9. The soil remediation equipment according to claim 6, characterized in that, the soil remediation equipment comprises the intermediate particles and/or the fine grain sieving machine for transporting the stirring and screening machine (4) to sieve out (5) the fifth conveyer belt (11) of the described fine particle that screens out and the crusher (12) that pulverizes described intermediate particle and/or described fine particle, described fifth conveyer belt (11) is at least used for The fine particle screening machine (5) is connected with the crusher (12). 10. The soil remediation device according to any one of claims 5-9, characterized in that, the soil remediation device comprises a third conveyor belt (8), and one end of the third conveyor belt (8) is connected to the Fine particle screening machine (5), is used for conveying described powdery fine soil outward; Preferably, at least two said third conveyor belts (8) arranged in parallel; Preferably, the soil remediation equipment includes a gantry crane (13) for adjusting the height of the end position of the delivery end of the third conveyor belt (8); Preferably, the third conveyor belt (8) is conveyed obliquely upward from one side of the fine particle screening machine (5) to the outside, and the included angle between the third conveyor belt (8) and the horizontal plane is 8-15°.