CN215785664U - Soil leaching system - Google Patents

Abstract

The application relates to the technical field of soil remediation, especially, relate to a soil leaching system, in order to solve the problem that prior art is low to the pollutant treatment efficiency in the soil, this application soil leaching system includes coarse screening mechanism, fine screening mechanism, meticulous screening mechanism, magnetic separation mechanism and dewatering mechanism. The coarse screening mechanism is used for soil desliming, cleaning and screening. The fine screening mechanism is connected with the coarse screening mechanism. And the fine screening mechanism is used for cleaning and vibrating screening the slurry discharged by the coarse screening mechanism. The fine screening mechanism is connected with the fine screening mechanism. The fine screening mechanism is used for performing vibration screening and mud-water separation on the mud discharged by the fine screening mechanism. The magnetic separation mechanism is connected with the fine screening mechanism. The magnetic separation mechanism is used for carrying out magnetic separation on the mud discharged by the fine screening mechanism. The dehydration mechanism is connected with the magnetic separation mechanism. The dehydration mechanism is used for dehydrating the sediment discharged by the magnetic separation mechanism. The application is used for treating pollutants in soil.

Description

Soil leaching system

Technical Field

The application relates to the technical field of soil remediation, in particular to a soil washing system.

Background

With the rapid development of the economy of China, the problem of soil pollution of China is increasingly prominent. The pollutants in the current polluted soil are mainly divided into two types: at present, heavy metal pollutants and organic pollutants are treated by adopting technologies such as chemical oxidation or thermal desorption. In the process of realizing the above treatment, at least the following problems exist: the efficiency of the treatment of pollutants in the soil is low.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a soil washing system for solving the problem that the pollutant treatment efficiency in soil is low in the prior art.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

the embodiment of the application provides a soil washing system. The soil leaching system comprises a coarse screening mechanism, a fine screening mechanism, a magnetic separation mechanism and a dehydration mechanism. The coarse screening mechanism is used for soil desliming, cleaning and screening. The fine screening mechanism is connected with the coarse screening mechanism. And the fine screening mechanism is used for cleaning and vibrating screening the slurry discharged by the coarse screening mechanism. The fine screening mechanism is connected with the fine screening mechanism. The fine screening mechanism is used for performing vibration screening and mud-water separation on the mud discharged by the fine screening mechanism. The magnetic separation mechanism is connected with the fine screening mechanism. The magnetic separation mechanism is used for carrying out magnetic separation on the mud discharged by the fine screening mechanism. The dehydration mechanism is connected with the magnetic separation mechanism. The dehydration mechanism is used for dehydrating the sediment discharged by the magnetic separation mechanism.

The soil washing system that this application embodiment provided. When the soil is leached, the soil is subjected to mud removal, cleaning and screening in the coarse screening mechanism, so that mud containing pollutants is obtained and solid particles are screened out. The solid particles are treated as building materials or backfilled in place. The slurry containing the pollutants enters a fine screening mechanism for cleaning and vibrating screening so as to obtain the slurry containing the pollutants and solid particles. The solid particles are treated as building materials or backfilled in place. The slurry containing the pollutants enters a fine screening mechanism for vibration screening and mud-water separation, so that the slurry containing the pollutants is further obtained and solid particles are screened out. The solid particles are treated as building materials or backfilled in place. The slurry containing the pollutants enters a magnetic separation mechanism for magnetic separation, so that magnetic materials and sediments containing the pollutants are obtained. The magnetic material is recovered into a magnetic separation mechanism. And (3) the sediment containing the pollutants enters a dehydration mechanism for dehydration treatment, so that solid particles and liquid of the sediment are obtained. From the above, it can be seen that the pollutants in the soil are effectively and continuously deposited in the sediment through multiple sieving. Multiple sieving avoids the discharge of contaminants through the solid particles. And finally, dehydrating the pollutants after multiple screening, and performing harmless treatment on the obtained precipitate solid particles. The soil leaching system is high in treatment efficiency of pollutants in the soil.

Optionally, the coarse screening mechanism is a drum cleaning device. The roller cleaning device comprises a roller, a first screen, a spray head and a stirring plate. The drum has a first feed inlet, a first slurry discharge outlet and a first solids discharge outlet. The first feed inlet is used for receiving soil. The first slurry outlet is used for discharging slurry after being subjected to sludge decomposition, cleaning and screening. The first solid particle discharge port is used for discharging the solid particles after being screened and separated. A first screen is mounted at the first sludge discharge opening for screening sludge discharged from the first sludge discharge opening. The shower nozzle is located the inside of cylinder and is close to first feed inlet setting for wash soil. The stirring plate is installed on the inner wall of the roller and is close to the first feeding hole, and is used for crushing and dispersing soil.

Optionally, the first screen has a mesh opening size of 3mm to 5 mm.

Optionally, the fine screening mechanism comprises a spiral cleaning device, a first vibratory screening device and an agitation cleaning device. The spiral cleaning device is provided with a second feeding hole, a second slurry discharging hole and a second solid particle discharging hole. The second feed port is adapted to receive the slurry discharged from the first slurry discharge port. The second slurry outlet is used for discharging slurry formed by unsettled particles and spraying liquid. The second solid particle discharge port is used for discharging separated solid particles. The first vibratory screening device includes a first vibratory chamber and a second screen. The first vibration chamber is adapted to receive solid particles discharged from the second solid particle discharge port. The first vibration chamber is provided with a solid particle feeding hole, a third solid particle discharging hole and a third slurry discharging hole. The solids feed inlet is adapted to receive solids discharged from the second solids discharge outlet. The third solids discharge port is for discharging screened solids. And the third slurry outlet is used for discharging the leached and screened slurry. The solids feed inlet is connected to the second solids discharge outlet. The second screen is arranged in the first vibration cavity and used for screening the solid particles discharged from the second solid particle discharge port. The stirring cleaning device is provided with a first slurry feeding hole and a fourth slurry discharging hole. The first slurry inlet is used for receiving the slurry discharged from the second slurry outlet and the third slurry outlet. The fourth slurry outlet is used for discharging the slurry after stirring and washing. The first slurry inlet is connected to the second slurry outlet and the third slurry outlet, respectively.

Optionally, the second screen has a mesh opening size of 0.5mm to 1 mm.

Optionally, the fine screening mechanism comprises a second vibratory screening device, a cyclone and a third vibratory screening device. The second vibratory screening device includes a second vibratory chamber and a third screen. The second vibration chamber is adapted to receive the slurry discharged from the fourth slurry discharge port. The second vibratory chamber has a second slurry inlet, a fourth solids discharge port, and a fifth slurry discharge port. The second slurry inlet is used for receiving the slurry discharged from the fourth slurry outlet. The fourth solids discharge port is for discharging screened solids. And the fifth slurry outlet is used for discharging the leached and screened slurry. The second slurry inlet is connected to the fourth slurry outlet. And the third screen is arranged in the second vibration cavity and is used for screening the slurry discharged from the fourth slurry discharge port. The cyclone is provided with a third slurry feeding hole, an overflow hole and a sand setting hole. The third slurry inlet port is adapted to receive slurry discharged from the fifth slurry discharge port. The overflow port is used for discharging slurry with small particle size. The sand setting port is used for discharging slurry with large particle size. The third slurry inlet is connected to the fifth slurry outlet. The third vibratory screening device includes a third vibratory chamber and a fourth screen. And the third vibration cavity is used for receiving the mud discharged from the sand setting port. The third vibratory chamber has a fourth slurry inlet, a fifth solids discharge port, and a sixth slurry discharge port. And the fourth slurry feeding hole is used for receiving the slurry discharged from the sand setting hole. The fifth solid particle discharge port is used for discharging screened solid particles. The sixth sludge discharge port is used for discharging the sludge screened by leaching. And the fifth slurry feeding hole is connected with the sand setting hole. And the fourth screen is arranged in the third vibration cavity and used for screening the slurry discharged from the sand settling port.

Optionally, the mesh opening of the third screen is 0.3-0.5 mm. The mesh aperture of the fourth screen is 0.075-0.3 mm.

Optionally, the magnetic separation mechanism comprises a stirring tank, a stirrer, a settling tank and a magnetic drum. The agitator tank has a fifth slurry feed inlet. The fifth slurry inlet port is adapted to receive slurry discharged from the sixth slurry discharge port. The fifth slurry feeding port is respectively connected with the sixth slurry discharging port and the overflow port. The agitator sets up in the agitator tank for stir mud. The settling tank has a first settling discharge port. The first sediment discharge port is used for discharging sediment. The stirring tank is communicated with the settling tank. The magnetic drum is provided with a first sediment feeding hole, a magnetic material discharging hole and a second sediment discharging hole. The first sediment feed inlet is used for receiving sediment discharged from the first sediment discharge outlet. The magnetic material discharge port is used for discharging the recovered magnetic material. The second sediment discharge port is used for discharging sediment after the magnetic material is recovered. The first sediment feed inlet is connected with the first sediment discharge outlet. The magnetic material discharge port is connected to the fifth slurry feed port.

Optionally, the dewatering mechanism has a second sediment feed inlet and a sixth solids discharge outlet. The second sediment feed inlet is used for receiving sediment discharged from the second sediment discharge outlet. And the sixth solid particle discharge port is used for discharging the dehydrated solid particles. The second sediment feed inlet is connected with the second sediment discharge outlet. Wherein the dewatering mechanism is a stacked screw dewaterer, a belt dewaterer, a plate-and-frame filter press or a horizontal screw centrifuge.

Optionally, the soil washing system further comprises a support, a belt conveyor rack, a feed hopper and a belt scale. The support is supported on the ground. The belt conveying frame is arranged on the support and used for conveying soil into the coarse screening mechanism. The feeder hopper is installed on the support for on leading-in to the belt conveying frame with soil. The belt weigher is arranged on the belt conveying frame and located below the feed hopper and used for weighing soil.

Drawings

Fig. 1 is a schematic block diagram of a processing mechanism in a soil washing system according to an embodiment of the present disclosure;

fig. 2 is a schematic block diagram of a processing apparatus in a soil washing system according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of a bracket, a belt conveyor, a feed hopper, and a belt scale according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a drum cleaning device according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of a spiral cleaning apparatus according to an embodiment of the present disclosure;

FIG. 6 is a schematic illustration of a first vibratory screening device in accordance with an embodiment of the present application;

FIG. 7 is a schematic illustration of a second vibratory screening device in accordance with an embodiment of the present application;

figure 8 is a schematic diagram of a third vibratory screening device in accordance with an embodiment of the present application.

Detailed Description

The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

In the description of the present application, it is to be understood that the terms "upper", "lower", "inside", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referenced mechanism or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The embodiment of the application provides a soil washing system, and the soil washing system can be used for washing and treating heavy metal polluted or organic matter polluted soil. The soil washing system shown with reference to fig. 1 may include a coarse screening mechanism 2, a fine screening mechanism 3, a fine screening mechanism 4, a magnetic separation mechanism 5, and a dewatering mechanism 6.

Wherein, soil is subjected to mud decomposition, cleaning and screening in a coarse screening mechanism 2 to obtain screened mud and solid particles containing pollutants. The solid particles are treated as building materials or backfilled in place. Because the fine screening mechanism 3 is connected with the coarse screening mechanism 2. Therefore, the slurry containing pollutants discharged by the coarse screening mechanism 2 enters the fine screening mechanism 3 for cleaning and vibration screening to obtain the slurry and solid particles. The solid particles are treated as building materials or backfilled in place. The fine screening mechanism 4 is connected with the fine screening mechanism 3.

In addition, the slurry discharged from the fine screening mechanism 3 enters the fine screening mechanism 4 for vibration screening and mud-water separation, and the slurry and solid particles are obtained. The solid particles are treated as building materials or backfilled in place. The magnetic separation mechanism 5 is connected with the fine screening mechanism 4. The mud discharged from the fine screening mechanism 4 is magnetically separated in a magnetic separation mechanism 5 to obtain magnetic materials and sediments containing pollutants. The magnetic material is recycled in the magnetic separation mechanism 5. Since the dewatering mechanism 6 is connected with the magnetic separation mechanism 5. Therefore, the sediment containing the pollutants discharged by the magnetic separation mechanism 5 is dehydrated in the dehydration mechanism 6, and finally dehydrated sediment solid particles and liquid are obtained.

It should be noted that the above-mentioned connection may be a direct connection or an indirect connection. The two mechanisms connected may not be in full contact, as long as soil, mud or solid particles are discharged or discharged in sequence.

For example, the fine screening mechanism 3 and the fine screening mechanism 4 may be directly connected by a pipe. In this case, one end of the fine screening mechanism 3 is connected to one end of the fine screening mechanism 4. Specifically, a slurry outlet on the fine screening mechanism 3 is connected with a slurry inlet on the fine screening mechanism 4 through a pipeline. Alternatively, the slurry discharged from the slurry outlet of the fine screening mechanism 3 is conveyed to the slurry inlet of the fine screening mechanism 4 by a conveyor belt. The indirect connection may be made by pumping the slurry from the slurry outlet of the fine screening means 3 into the slurry inlet of the fine screening means 4.

Therefore, when the soil washing system provided by the embodiment of the application washes soil, the soil is deslimed, cleaned and screened in the coarse screening mechanism 2, so that slurry containing pollutants is obtained and solid particles are screened out. The solid particles are treated as building materials or backfilled in place. The slurry containing the pollutants enters a fine screening mechanism 3 for cleaning and vibrating screening so as to obtain the slurry containing the pollutants and solid particles. The solid particles are treated as building materials or backfilled in place. The slurry containing the pollutants enters a fine screening mechanism 4 for vibration screening and mud-water separation, so that the slurry containing the pollutants is further obtained and solid particles are screened out. The solid particles are treated as building materials or backfilled in place. The slurry containing the pollutants enters a magnetic separation mechanism 5 for magnetic separation, so that magnetic materials and sediments containing the pollutants are obtained. The magnetic material is recovered to the magnetic separation mechanism 5. The sediment containing the pollutants enters a dewatering mechanism 6 for dewatering treatment, so that solid particles and liquid of the sediment are obtained. From the above, it can be seen that the pollutants in the soil are effectively and continuously deposited in the sediment through multiple sieving. Multiple sieving avoids the discharge of contaminants through the solid particles. And finally, dehydrating the pollutants after multiple screening, and performing harmless treatment on the obtained precipitate solid particles. The soil leaching system is high in treatment efficiency of pollutants in the soil.

To sum up, the soil washing system of this application carries out the treatment effeciency height to the pollutant in the soil. When the soil contains pollutants, the soil is difficult to plant crops or trees, and the human health is affected.

In some embodiments of the present application, the contaminants in the soil may be mainly heavy metal contaminants and organic contaminants. For example, the heavy metal contaminant is copper, lead, zinc, iron, cobalt, nickel, manganese, cadmium, mercury, or the like. The organic pollutant is polycyclic aromatic hydrocarbon, dioxin, pesticide, etc.

From the above, the soil washing system provided by the embodiment of the application can effectively treat the pollutants in the soil. The structure of the various components of the soil washing system described above is illustrated below.

In some embodiments of the present application. Referring to fig. 3, the soil washing system of the present application includes a rack 101, a belt conveyor rack 102, a feed hopper 104, and a belt scale 103. The stand 101 is supported on the ground. The bracket 101 may be fastened to the ground by screws to avoid shaking or collapsing of the bracket 101. The belt conveyor 102 is mounted on the frame 101 in an inclined manner so as to lift the soil into the coarse screening mechanism 2 for cleaning and screening. A feed hopper 104 is mounted on the frame 101, the feed hopper 104 facilitating the introduction of soil onto the belt conveyor 102.

In addition, the feed hopper 104 may be a tapered hopper that can act as a holding tank for contaminated soil, thereby ensuring the continuity and stability of the soil feed. The present application is not limited to a particular shape of the feed hopper 104. The belt weigher 103 is installed on the belt conveyor frame 102 and located below the feed hopper 104, and the belt weigher 103 is convenient for weighing soil, so that the conveying amount of the soil is measured.

In some embodiments of the present application. The coarse screening mechanism 2 is a roller cleaning device 20. Referring to fig. 4, the drum cleaning device 20 includes a drum 201, a first screen 202, a spray head, and a stirring plate. The bowl 201 has a first inlet port 205, a first sludge discharge port 203 and a first solids discharge port 204. The spray head and the stirring plate are not shown in the figure, and the spray head is located inside the roller 201 and is arranged close to the first feed port 205. The agitating plate is installed on the inner wall of the drum 201 and disposed near the first feeding hole 205. A first screen 202 is mounted at a first mud discharge port 203.

Illustratively, the first screen 202 has a mesh opening size of 3mm to 5 mm. The present application is not particularly limited. When the mesh opening size of the first mesh 202 is less than 3mm, the effect of sieving solid particles in soil is not good. When the mesh size of the first screen 202 is larger than 5mm, excessive solid particles are mixed into the slurry, thereby affecting the subsequent screening efficiency. Therefore, when the mesh opening of the first screen 202 is 3mm to 5mm, the screening of the solid particles in the soil can be ensured. But also can improve the treatment efficiency of pollutants. Illustratively, the first screen 202 may have a mesh opening size of 3mm, 4mm, 4.5mm, or 5 mm.

Based on the above, soil enters the drum 201 through the first inlet 205 as shown in fig. 2. Because the drum 201 is rotating, the soil is crushed and dispersed by the stirring plate in the drum 201, and meanwhile, the leaching solution is sprayed by the spray head to desliming and cleaning the soil. The first screen 202 continuously screens the soil to obtain solid particles and a slurry containing contaminants which is discharged through a first slurry discharge port 203. And the solid particles are discharged through the first solid particle discharge port 204. And after the solid particles are detected to be qualified, the solid particles are used as building materials for resource utilization or in-situ backfilling.

In some embodiments of the present application. Referring to figure 5, the fine screening mechanism 3 includes a spiral cleaning device 30, a first vibratory screening device 40 and an agitator cleaning device 60. The spiral cleaning device 30 includes a cleaning tank 301, a rotating shaft 302, a spiral blade 303 and a motor 304. Specifically, the cleaning tank 301 is disposed obliquely, so as to separate large solid particles. The rotating shaft 302 is disposed in the cleaning tank 301 and is rotatably connected to the cleaning tank 301. The helical blade 303 is provided on the rotating shaft 302. The motor 304 is installed outside the cleaning tank 301 and drives the rotating shaft 302 to rotate axially. The cleaning tank 301 has a second inlet 305, a second slurry outlet 306 and a second solid particle outlet 307.

In addition, referring to FIG. 6, the first vibratory screening device 40 includes a first vibratory chamber 401 and a second screen 404. A second screen 404 is disposed within the first vibration chamber 401. The second screen 404 has a mesh opening of 0.5mm to 1 mm. The application is not particularly limited, and the screening effect on solid particles in soil is poor due to the fact that the aperture of the sieve is smaller than 0.5 mm. When the aperture of the sieve pore is larger than 1mm, excessive solid particles are mixed into the slurry, so that the subsequent sieving efficiency is influenced. Therefore, the second screen 404 has a mesh opening of 0.5mm to 1 mm. Not only can ensure the screening of solid particles in the soil, but also can improve the treatment efficiency of pollutants. Illustratively, the second screen 404 may have a mesh opening size of 0.5mm, 0.6mm, or 1 mm. The first vibrating chamber 401 has a solids inlet 402, a third solids outlet 403, and a third slurry outlet 405. The agitator cleaning device 60 has a first slurry inlet 601 and a fourth slurry outlet 602.

Based on the above, the slurry containing contaminants discharged from the first slurry discharge port 203 shown in FIG. 2 is introduced into the second feed port 305 by a pump, and the slurry containing contaminants discharged from the first slurry discharge port 203 is introduced into the cleaning tank 301. The slurry containing the pollutants is stirred in the cleaning tank 301 through the spiral blade 303, so that solid particles with larger particle sizes are separated from the slurry containing the pollutants. The solid particles having a large particle diameter are discharged through the second solid particle discharge port 307. While the contaminant-laden slurry of unsettled particles and spray liquid is discharged through a second slurry discharge port 306. The solid particles discharged from the second solid particle discharge port 307 are discharged into the first vibration chamber 401 through the solid particle feed port 402. And screened through a second screen 404 and rinsed through a spray head.

In addition, the screened solid particles are discharged through a third solid particle discharge port 403 and recycled as building materials or backfilled in situ. The further contaminated slurry from the rinsing is discharged through a third slurry outlet 405 into the first buffer tank 50. Meanwhile, the second slurry outlet 306 and the slurry containing the pollutants discharged from the first buffer tank 50 are discharged into the agitation and cleaning device 60 through the first slurry inlet 601, and are agitated by the agitator 603 and rinsed by the spray head. The solid in the mud containing the pollutants and the leacheate are fully stirred, and the deep leaching of the particles in the soil is realized. The resulting contaminant-containing slurry is discharged through a pump connected to a fourth slurry discharge port 602.

In some embodiments of the present application. Referring to figure 1, the fine screening mechanism 4 includes a second vibratory screening device 70, a cyclone 90 and a third vibratory screening device 100.

Referring to figure 7, the second vibratory screening device 70 includes a second vibratory chamber 701 and a third screen 704. The second vibratory chamber 701 has a second slurry feed inlet 702, a fourth solids discharge outlet 703, and a fifth slurry discharge outlet 705. A third screen 704 is disposed within the second vibratory chamber 701. The mesh aperture of the third screen 704 is 0.3-0.5 mm. The application is not particularly limited, and when the aperture of the sieve is smaller than 0.3mm, the screening effect on solid particles in the slurry is poor. When the aperture of the sieve is larger than 0.5mm, excessive solid particles are mixed into the slurry, thereby affecting the subsequent sieving efficiency. Therefore, the mesh opening of the third screen 704 is 0.3 to 0.5 mm. Not only can ensure the screening of solid particles in the soil, but also can improve the treatment efficiency of pollutants. Illustratively, the third screen 704 may have a mesh opening size of 0.3mm, 0.4mm, or 0.5 mm. Cyclone 90 has a third slurry feed 901, overflow 903 and grit chamber 902. One or two cyclones 90 may be used.

Referring to figure 8, the third vibratory screening device 100 includes a third vibratory chamber 1001 and a fourth screen 1004. The third vibratory chamber 1001 has a fourth slurry inlet port 1002, a fifth solids discharge port 1003, and a sixth slurry discharge port 1005. A fourth screen 1004 is disposed within the third vibration chamber 1001. The mesh aperture of the fourth screen 1004 is 0.075-0.3 mm. The application is not specifically limited, and the mesh opening diameter is smaller than 0.075mm, so that the solid particles in the slurry are easy to block the mesh opening, and the screening effect is influenced. When the pore diameter of the sieve pore is more than 0.3mm, the magnetic separation is not facilitated. Therefore, the mesh size of the fourth screen 1004 is 0.075 to 0.3 mm. Not only can ensure the screening of solid particles in the soil, but also can improve the treatment efficiency of pollutants. Illustratively, the fourth screen 1004 may have a mesh opening size of 0.075mm, 0.1mm, 0.2mm, or 0.3 mm.

Based on the above basis. The contaminant-laden slurry exiting the fourth slurry outlet 602, shown with reference to FIG. 2, is directed to the second slurry feed port 702. Thereby discharging the sludge containing the pollutants into the second vibration chamber 701, and obtaining solid particles and sludge containing the pollutants in the second vibration chamber 701 through the sieving of the third screen 704 and the rinsing through the spray head. The solid particles are discharged through a fourth solid particle discharge port 703 for recycling or backfilling in situ. While the resulting slurry containing contaminants is discharged to the second surge tank 80 through a fifth slurry discharge 705. The slurry containing the contaminants in the second buffer tank 80 is introduced into the third slurry inlet 901 by a pump, and the slurry containing the contaminants is discharged into the cyclone 90 to be separated into slurry containing the contaminants with a small particle size and slurry containing the contaminants with a large particle size. The small particle size slurry containing contaminants is discharged through overflow 903. The large-particle size pollutant-containing slurry is discharged to the fourth slurry feed port 1002 through the sand setting port 902, so that the large-particle size pollutant-containing slurry is discharged into the third vibration chamber 1001 for vibration screening and leaching. Thereby obtaining solid particles and slurry containing pollutants. The solid particles are discharged through a fifth solid particle discharge port 1003 for resource utilization or landfill. At the same time, the contaminant-laden mud is discharged through the sixth mud discharge port 1005 into the third surge tank 110.

In some embodiments of the present application. The magnetic separation mechanism 5 shown with reference to fig. 2 includes a stirring tank 120, a stirrer 1202, a settling tank 130, and a magnetic drum 140. The agitator tank 120 has a fifth slurry inlet 1201. Stirrer 1202 is disposed within agitator tank 120. The settling tank 130 has a first settling discharge opening 1301. The magnetic drum 140 has a first precipitation feed port 1401, a magnetic material discharge port 1402, and a second precipitation discharge port 1403.

Based on the above, the slurry containing contaminants in the third buffer tank 110 and the slurry containing contaminants discharged from the overflow port 903 shown in fig. 2 are introduced into the agitator tank 120 through the fifth slurry inlet 1201 by a pump. The slurry containing the contaminants is stirred in the stirring tank 120 by the stirrer 1202, so that the slurry containing the contaminants, the flocculant and the magnetic material are sufficiently mixed to form flocs containing the magnetic material. The magnetic material has a large specific gravity, so that the settling speed of the floc can be accelerated, and the time required by settling is reduced. Since the agitation tank 120 is in communication with the precipitation tank 130. The slurry containing the pollutants, the flocculating agent and the magnetic material which are stirred and mixed uniformly enter the precipitation tank 130 for precipitation. The supernatant after precipitation is used as eluent for recycling. The settled flocs are discharged through the first settling discharge port 1301 and are pumped to the first settling feed port 1401 where they are discharged into the drum 140. The magnetic material is recovered in the magnetic drum 140 and discharged to the fifth slurry feed port 1201 through the magnetic material discharge port 1402 to be discharged into the agitation tank 120 for recycling. And the magnetic drum 140 discharges the sediment into the fourth buffer tank 150 through the second sediment discharge port 1403 after recovering the magnetic material.

In some embodiments of the present application. The dewatering mechanism 6 is a stacked screw dewaterer, a belt dewaterer 160, a plate-and-frame filter press or a horizontal screw centrifuge. The present application is not particularly limited. Referring to fig. 2, the dewatering mechanism 6 has a second settling feed 1601 and a sixth solid particle discharge 1602. The sediment in the fourth buffer tank 150 is introduced into the second sediment feed port 1601 by a pump, and the sediment is discharged into the dewatering mechanism 6. The precipitate is subjected to dehydration treatment in the dehydration mechanism 6. The solid particles obtained after the dehydration are discharged through a sixth solid particle discharge port 1602. And the liquid obtained after dehydration is recycled or discharged into the settling tank 1 again for further treatment. The leacheate can be selected from clear water, oxalic acid, citric acid, sodium hydroxide hydrochloride, sodium carbonate, ethylene diamine tetraacetic acid or a surfactant and the like according to requirements. The present application is not particularly limited thereto.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A soil washing system, comprising:

the coarse screening mechanism is used for desliming, cleaning and screening soil;

the fine screening mechanism is connected with the coarse screening mechanism and is used for cleaning and vibrating and screening the slurry discharged by the coarse screening mechanism;

the fine screening mechanism is connected with the fine screening mechanism and is used for carrying out vibration screening and mud-water separation on the mud discharged by the fine screening mechanism;

the magnetic separation mechanism is connected with the fine screening mechanism and is used for carrying out magnetic separation on the slurry discharged by the fine screening mechanism; and the number of the first and second groups,

and the dehydration mechanism is connected with the magnetic separation mechanism and is used for dehydrating the sediment discharged by the magnetic separation mechanism.

2. The soil washing system of claim 1, wherein the coarse screening mechanism is a roller washing device comprising:

a drum having a first feed inlet, a first slurry discharge outlet, and a first solids discharge outlet; the first feed port is used for receiving soil, the first slurry discharge port is used for discharging slurry after sludge decomposition, cleaning and screening, and the first solid particle discharge port is used for discharging solid particles after screening and separation;

a first screen installed at the first slurry outlet port for screening the slurry discharged from the first slurry outlet port;

the spray head is positioned inside the roller and close to the first feed inlet and is used for cleaning soil; and the number of the first and second groups,

and the stirring plate is arranged on the inner wall of the roller and close to the first feed inlet and is used for crushing and dispersing soil.

3. The soil washing system of claim 2, wherein the first screen has a mesh size of between 3mm and 5 mm.

4. The soil washing system of claim 2, wherein the fine screening mechanism includes a spiral cleaning device, a first vibratory screening device, and an agitator cleaning device;

the spiral cleaning device is provided with a second feeding hole, a second slurry discharging hole and a second solid particle discharging hole, the second feeding hole is used for receiving the slurry discharged from the first slurry discharging hole, the second slurry discharging hole is used for discharging the slurry formed by the unsettled particles and the spraying liquid, and the second solid particle discharging hole is used for discharging the separated solid particles;

the first vibratory screening device includes:

a first vibratory chamber for receiving solid particles discharged from said second solid particle discharge outlet;

the first vibration cavity is provided with a solid particle feeding hole, a third solid particle discharging hole and a third slurry discharging hole, the solid particle feeding hole is used for receiving solid particles discharged from the second solid particle discharging hole, the third solid particle discharging hole is used for discharging screened solid particles, the third slurry discharging hole is used for discharging leached and screened slurry, and the solid particle feeding hole is connected with the second solid particle discharging hole; and the number of the first and second groups,

the second screen is arranged in the first vibration cavity and used for screening the solid particles discharged from the second solid particle discharge port;

the stirring and cleaning device is provided with a first slurry feeding hole and a fourth slurry discharging hole, the first slurry feeding hole is used for receiving the slurry discharged from the second slurry discharging hole and the third slurry discharging hole, the fourth slurry discharging hole is used for discharging the slurry after stirring and washing, and the first slurry feeding hole is respectively connected with the second slurry discharging hole and the third slurry discharging hole.

5. The soil washing system of claim 4, wherein the second screen has a mesh size of 0.5mm to 1 mm.

6. The soil washing system of claim 4, wherein the fine screening mechanism includes a second vibratory screening device, a cyclone, and a third vibratory screening device;

the second vibratory screening device includes:

a second vibration chamber for receiving the slurry discharged from the fourth slurry discharge port;

the second vibration cavity is provided with a second slurry feeding hole, a fourth solid particle discharging hole and a fifth slurry discharging hole, the second slurry feeding hole is used for receiving slurry discharged from the fourth slurry discharging hole, the fourth solid particle discharging hole is used for discharging screened solid particles, the fifth slurry discharging hole is used for discharging leached and screened slurry, and the second slurry feeding hole is connected with the fourth slurry discharging hole; and the number of the first and second groups,

the third screen is arranged in the second vibration cavity and used for screening the slurry discharged from the fourth slurry discharge port;

the cyclone is provided with a third slurry feeding hole, an overflow hole and a sand setting hole, the third slurry feeding hole is used for receiving the slurry discharged from the fifth slurry discharge port, the overflow hole is used for discharging the slurry with small particle size, the sand setting hole is used for discharging the slurry with large particle size, and the third slurry feeding hole is connected with the fifth slurry discharge port;

the third vibratory screening device includes:

the third vibration cavity is used for receiving the mud discharged from the sand setting port;

the third vibration cavity is provided with a fourth slurry feeding hole, a fifth solid particle discharging hole and a sixth slurry discharging hole, the fourth slurry feeding hole is used for receiving the slurry discharged from the sand setting port, the fifth solid particle discharging hole is used for discharging screened solid particles, the sixth slurry discharging hole is used for discharging the slurry screened by leaching, and the fifth slurry feeding hole is connected with the sand setting port; and the number of the first and second groups,

and the fourth screen is arranged in the third vibration cavity and used for screening the slurry discharged from the sand settling port.

7. The soil washing system of claim 6, wherein the third screen has a mesh size of 0.3-0.5 mm and the fourth screen has a mesh size of 0.075-0.3 mm.

8. The soil washing system of claim 6, wherein the magnetic separation mechanism comprises:

the stirring tank is provided with a fifth slurry feeding hole, the fifth slurry feeding hole is used for receiving the slurry discharged by the sixth slurry discharging hole, and the fifth slurry feeding hole is respectively connected with the sixth slurry discharging hole and the overflow port;

the stirrer is arranged in the stirring tank and is used for stirring the slurry;

the sedimentation tank is provided with a first sediment discharge port for discharging sediment, and the stirring tank is communicated with the sedimentation tank; and the number of the first and second groups,

the magnetic drum is provided with a first sediment feeding hole, a magnetic material discharging hole and a second sediment discharging hole, the first sediment feeding hole is used for receiving sediment discharged by the first sediment discharging hole, the magnetic material discharging hole is used for discharging recycled magnetic materials, the second sediment discharging hole is used for discharging the sediment after the magnetic materials are recycled, the first sediment feeding hole is connected with the first sediment discharging hole, and the magnetic material discharging hole is connected with the fifth slurry feeding hole.

9. The soil washing system as claimed in claim 8, wherein the dewatering mechanism has a second sediment feed inlet for receiving the sediment discharged from the second sediment discharge outlet and a sixth solids discharge outlet for discharging the dewatered solids, the second sediment feed inlet being connected to the second sediment discharge outlet;

wherein the dewatering mechanism is a stacked screw dewaterer, a belt dewaterer, a plate-and-frame filter press or a horizontal screw centrifuge.

10. The soil washing system of claim 1, further comprising:

the bracket is supported on the ground;

the belt conveying frame is arranged on the bracket and used for conveying soil into the coarse screening mechanism;

the feeding hopper is arranged on the bracket and used for guiding soil onto the belt conveying frame; and the number of the first and second groups,

and the belt weigher is arranged on the belt conveying frame and positioned below the feed hopper and used for weighing soil.

Images