Integrated ex situ soil remediation system and method of use thereof

Abstract

The present invention provides an integrated ex situ soil remediation system and a method for using the same. The remediation system includes a feeding device, a weighing device disposed below the feeding device, and a first conveying part for conveying soil is disposed in the weighing device. A dust collecting device for collecting dust is disposed between the stirring device and the weighing device. It includes a first dust collecting pipe, a second dust collecting pipe, and a third dust collecting pipe. The stirring device includes a stirring body, a planetary gear mechanism, and a stirring blade. A stirring chamber is provided in the stirring body, the planetary gear mechanism is disposed above the stirring chamber, the stirring blade is disposed on the planetary wheel, and the stirring blade is disposed in the stirring chamber; a baffle extending into the stirring chamber is connected to the center wheel, the baffle is made of elastic material, and the baffle can be moved during the rotation of the stirring blade. The integrated ex situ soil remediation system described in the present invention realizes the integration of the ex situ soil remediation process and can achieve a better mixing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of ex situ soil remediation, and in particular to an integrated ex situ soil remediation system and a use method thereof. Background Art

[0002] At present, the commonly used ex situ remediation technologies at home and abroad mainly include: physical separation, stabilization / solidification technology, water washing and leaching technology, ex situ incineration technology, ex situ heat treatment technology, ex situ chemical oxidation / reduction technology, ex situ microbial remediation technology, etc. The common feature of ex situ remediation technology is that the contaminated soil needs to be excavated from the contaminated site and transferred to a specially built disposal site. In the above ex situ remediation technology of soil, the core process of most technical routes requires the contaminated soil to be fully mixed with the corresponding materials in a precise proportion.

[0003] At present, the widely used ex situ treatment equipment has certain constraints. First, fixed equipment has high requirements for the basic conditions of the repair site, high infrastructure costs, low recovery rate of infrastructure materials, and high waste of resources. Third, most of the existing treatment equipment has complex structures, high operating costs, and low integration. Most of them are independent equipment that realizes a single function. The transportation work is complicated and the repair efficiency is low.

[0004] In addition, the existing mixing equipment has a slightly poor longitudinal mixing capacity when mixing soil, and the mixing effect on the surface soil in the mixing bin is poor; in the existing technology, most of the longitudinal mixing capacity is provided by high-speed mixing blades rotating at high speed. This design works very well when mixing cement mortar, but it is still slightly lacking in longitudinal mixing capacity when applied to the field of soil remediation with a larger material bulk density. In addition, the mixing effect of the low-speed mixing zone and the high-speed mixing zone in the existing mixing equipment is quite different, and there is still a relative mixing dead angle in the mixer. Summary of the invention

[0005] In view of this, the present invention aims to propose an integrated ex situ soil remediation system to realize the integration of ex situ soil remediation processes and achieve a better mixing effect.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] An integrated ex situ soil remediation system comprises a feeding device, a weighing device arranged below the feeding device, wherein the weighing device is provided with a first conveying part for conveying soil;

[0008] The delivery outlet of the first delivery part is connected to the second delivery part, and the delivery outlet of the second delivery part is connected to the stirring device;

[0009] The feeding port of the feeding device is provided with a screening part for vibrating and screening soil particles, and a dust collecting device for collecting dust is provided between the stirring device and the weighing device;

[0010] The dust collecting device comprises a first dust collecting pipe arranged between the feeding device and the weighing device, a second dust collecting pipe arranged at the outlet of the first conveying part and the inlet of the second conveying part, and a third dust collecting pipe arranged at the outlet of the second conveying part and the inlet of the stirring device;

[0011] The first dust collecting pipe, the second dust collecting pipe and the third dust collecting pipe are connected in parallel to the inlet end of the dust collecting device, and a nozzle for spraying dust is provided in the dust collecting device, and the outlet of the dust collecting device leads to the second conveying part;

[0012] The stirring device comprises a stirring body, a planetary gear mechanism, and a stirring blade, wherein the planetary gear mechanism comprises a driving part, a center wheel located on a center frame, a sun wheel fixedly arranged on the stirring body, and a planetary wheel arranged between the sun wheel and the center wheel, wherein the center wheel is connected to a power output end of the driving part;

[0013] The stirring body is provided with a stirring chamber, the planetary gear mechanism is arranged above the stirring chamber, the stirring blade is arranged on the planetary wheel, and the stirring blade is arranged in the stirring chamber; the central wheel is connected with a baffle extending into the stirring chamber, the baffle is made of elastic material, and the baffle can be moved during the rotation of the stirring blade.

[0014] Furthermore, the feeding device includes two storage bins arranged in parallel, the weighing device includes a weighing bin, and the outlets of the two storage bins are located above the weighing bins.

[0015] Furthermore, a plurality of weighing sensors are evenly arranged below the weighing bin, a discharge port is arranged at the bottom of the weighing bin, and the first conveying part includes a first conveying belt and a first motor driving the first conveying belt to convey;

[0016] The discharge port is arranged at the feed end of the first conveyor belt.

[0017] Furthermore, the second conveying part includes a conveying frame and a second conveyor belt arranged on the conveying frame, the second conveyor belt is rotated by the drive of a second motor, the feeding section of the second conveyor belt is located at the discharging end of the first conveyor belt, and the discharging section of the second conveyor belt is provided with a funnel.

[0018] Furthermore, a connecting plate is provided at one end of the conveying frame close to the weighing device, and an outwardly folded flange is provided axially of the funnel, and connecting holes are provided on the flange and the connecting plate.

[0019] Furthermore, the stirring device also includes a vertical axis arranged below the planetary gear and a horizontal axis connected below the vertical axis, two connecting axes are arranged at a preset angle on the horizontal axis, and the upper ends of the two connecting axes are fixed at the two ends of the horizontal axis, and the lower ends of the connecting shafts extend to the bottom of the stirring chamber, and the stirring blades are connected to the lower ends of the connecting shafts, and the stirring blades are 0.5mm~2mm away from the bottom surface of the stirring chamber.

[0020] Furthermore, the sun gear is connected to one or more connecting rods, the connecting rods extend into the stirring chamber, and the blocking piece is provided at one end of each connecting rod close to the bottom of the stirring chamber.

[0021] Furthermore, the stirring blade is provided with a baffle, the baffle protrudes from the upper plane of the stirring blade, and / or the baffle protrudes from the lower plane of the stirring blade;

[0022] The two or more baffles are arranged in parallel.

[0023] Furthermore, it also includes a dosing device arranged on one side of the stirring device, the dosing device includes a dosing metering hopper and a dosing bin, the dosing bin is arranged above the stirring body, and a spiral conveyor belt is arranged between the dosing metering hopper and the dosing bin.

[0024] Another object of the present invention is to provide a method for using an integrated ex situ soil remediation system, comprising the following steps:

[0025] Step 1: The material to be repaired is transported to one of the feed bins of the feed device through an external conveying device, and then is screened by the screening part of the feed bin and then enters the weighing bin for weighing. When the weighed weight reaches the set weight, the discharge port of the weighing bin is opened, and the material is transported through the first conveyor belt;

[0026] Step 2: The first conveyor belt conveys the material to the feeding section of the second conveyor belt, and the material is conveyed into the stirring chamber through the second conveyor belt. At the same time, the dosing device determines the required dosage through the dosing metering bin, and then conveys the medicine to the dosing bin through the spiral conveyor belt, and continues to dosing during the material stirring process;

[0027] Step 3: The dust collecting device is started, so that the first dust collecting pipe, the second dust collecting pipe and the third dust collecting pipe generate negative pressure to collect dust between the feeding device and the weighing device, at the outlet of the first conveying part and the inlet of the second conveying part, and at the connection between the outlet of the second conveying part and the inlet of the stirring device;

[0028] Step 4: The driving part of the stirring device is started to drive the planetary gear mechanism to rotate, so that the stirring blades on the planetary wheel rotate with the planetary wheel, and the baffle on the sun wheel rotates with the sun wheel, stirring the material in the stirring chamber, so that the material is fully integrated with the medicine in the stirring chamber for repair;

[0029] Step 5: Step 3, Step 2 and Step 1 are carried out simultaneously, and the repaired material stirred in Step 4 is collected.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] The integrated ex situ soil remediation system of the present invention can integrate the feeding, dosing, mixing and stirring, and dust collection in the process of ex situ soil remediation by sequentially arranging a feeding device, a weighing device, a first conveying part, and a second conveying part, and a stirring device arranged at the outlet of the second conveying part, thereby realizing an efficient, multifunctional, low-cost, and easy-to-transport integrated soil ex situ remediation system.

[0032] In addition, a dust collecting device is provided to prevent dust from being raised during transportation of the soil, which can not only effectively prevent dust from polluting the external environment, but also spray the dust through the dust collecting device before transporting and repairing it again, thereby improving the repair efficiency. Moreover, a planetary gear mechanism is provided to enable the stirring blades and baffles to stir at different speeds, thereby achieving high-speed and low-speed stirring in the stirring chamber, and the baffles can be provided to scrape off the clay on the stirring blades, thereby improving the degree of stirring and mixing and ensuring the repair effect of the repaired soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0034] Figure 1 It is a schematic structural diagram of the integrated ex situ soil remediation system according to an embodiment of the present invention;

[0035] Figure 2 It is a schematic diagram of the side structure of the feeding device according to an embodiment of the present invention;

[0036] Figure 3 It is a schematic diagram of the top view of the feeding device according to an embodiment of the present invention;

[0037] Figure 4 It is a structural schematic diagram of the weighing device and the first conveying part according to an embodiment of the present invention;

[0038] Figure 5 A schematic diagram of the structure of a dust collecting device according to an embodiment of the present invention;

[0039] Figure 6 It is a schematic diagram of the structure of the dosing device and the stirring device according to an embodiment of the present invention;

[0040] Figure 7 This is a schematic diagram of the installation structure of the planetary gear mechanism, stirring blades, and baffles according to an embodiment of the present invention;

[0041] Figure 8 This is a schematic diagram of the structure of the stirring blade according to an embodiment of the present invention;

[0042] Fig. 9 This is a graph showing the test results of the coefficient of difference in mixing uniformity in different regions of the present invention;

[0043] Fig.10 The following table is a graph of the contaminated soil treatment capacity under different conditions of the present invention;

[0044] Description of reference numerals:

[0045] 1. Feeding device; 2. Weighing device; 3. First conveying part; 4. Second conveying part; 5. Stirring device; 6. Dust collecting device; 7. Dosing device;

[0046] 101. Screening section; 102. Storage bin;

[0047] 201. weighing bin; 202. weighing sensor;

[0048] 301, first motor;

[0049] 401, conveying frame; 402, second conveying belt; 403, second motor; 404, funnel; 405, connecting plate; 406, flange;

[0050] 501, stirring body; 502, stirring blade; 503, driving part; 504, center wheel; 505, sun wheel; 506, planetary wheel; 507, stirring chamber; 508, baffle; 509, vertical axis; 510, horizontal axis; 511, connecting axis; 512, connecting rod;

[0051] 601, first dust collecting pipe; 602, second dust collecting pipe; 603, third dust collecting pipe;

[0052] 701, dosing metering bucket; 702, dosing bin;

[0053] 5021. Baffle. DETAILED DESCRIPTION

[0054] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0055] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "back", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0056] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installed", "connected", "connected", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0057] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0058] The present embodiment relates to an integrated ex situ soil remediation system, which includes a feeding device 1, a weighing device 2 arranged below the feeding device 1, and a first conveying part 3 for conveying soil is arranged in the weighing device 2.

[0059] The delivery outlet of the first delivery part 3 is connected to the second delivery part 4, and the delivery outlet of the second delivery part 4 is connected to the stirring device 5. The feeding port of the feeding device 1 is provided with a screening part 101 for vibrating and screening soil particles, and a dust collecting device 6 for collecting dust is provided between the stirring device 5 and the weighing device 2.

[0060] The dust collecting device 6 includes a first dust collecting pipe 601 disposed between the feeding device 1 and the weighing device 2, a second dust collecting pipe 602 disposed at the outlet of the first conveying part 3 and the inlet of the second conveying part 4, and a third dust collecting pipe 603 disposed at the outlet of the second conveying part 4 and the inlet of the stirring device 5. The first dust collecting pipe 601, the second dust collecting pipe 602 and the third dust collecting pipe 603 are connected in parallel at the inlet end of the dust collecting device 6, and a nozzle for spraying dust is disposed in the dust collecting device 6, and the outlet of the dust collecting device 6 leads to the second conveying part 4.

[0061] The stirring device 5 includes a stirring body 501, a planetary gear mechanism, and a stirring blade 502. The planetary gear mechanism includes a driving part 503, a center wheel 504 located on a center frame, a sun wheel 505 fixedly arranged on the stirring body 501, and a planetary wheel 506 arranged between the sun wheel 505 and the center wheel 504. The center wheel 504 is connected to the power output end of the driving part 503. A stirring chamber 507 is provided in the stirring body 501, the planetary gear mechanism is arranged above the stirring chamber 507, the stirring blade 502 is arranged on the planetary wheel 506, and the stirring blade 502 is arranged in the stirring chamber 507; a baffle 508 extending into the stirring chamber 507 is connected to the center wheel 504, and the baffle 508 is made of elastic material. The baffle 508 can be moved during the rotation of the stirring blade 502.

[0062] The integrated ex situ soil remediation system of this embodiment can integrate the feeding, dosing, mixing, and dust collection in the process of ex situ soil remediation by sequentially arranging a feeding device 1, a weighing device 2, a first conveying part 3, and a second conveying part 4, and a stirring device 5 arranged at the outlet of the second conveying part 4, so as to realize an efficient, multifunctional, low-cost, and easy-to-transport integrated soil ex situ remediation system.

[0063] In addition, by setting up a dust collecting device 6, dust is avoided during the transportation of soil, which can not only effectively prevent dust from polluting the external environment, but also spray the dust through the dust collecting device 6 and then transport it again for repair, thereby improving the repair efficiency. The internal structure of the dust collecting device 6 of this embodiment can be set with reference to the prior art, except that three parallel dust collecting pipes are set at the outlet end of the dust collecting device 6 to collect dust generated during the soil transportation process.

[0064] Moreover, by setting a planetary gear mechanism, the stirring blade 502 and the baffle 508 can be stirred at different speeds, thereby realizing high-speed and low-speed stirring in the stirring chamber 507. The baffle 508 can also be used to scrape off the clay on the stirring blade 502, thereby improving the degree of stirring and mixing and ensuring the repair effect of the repaired soil.

[0065] Based on the above overall introduction, the exemplary structure of the integrated ex situ soil remediation system of this embodiment is as follows: Figure 1As shown in , the feeding device 1 includes two storage bins 102 arranged in parallel, and the weighing device 2 includes a weighing bin 201. The outlets of the two storage bins 102 are located above the weighing bin 201. The storage bins 102 adopt a double-bin design. To ensure that the equipment can operate continuously, the volume of the storage bins 102 of this embodiment is greater than 6.0m3. Each bin can provide the full load operation of the mixing device 5 once. The size of a single storage bin 102 is 2.0m×2.0m×1.6m. The storage bin 102 is covered with a steel mesh with a mesh diameter of 50mm, which can effectively prevent large gravels mixed in the contaminated soil from entering the mixer and causing damage to the equipment.

[0066] The discharge port of the storage bin 102 is provided with a pneumatic butterfly valve to control opening and closing. A vibrator is installed on each storage bin 102. When the pneumatic butterfly valve bin door is opened, the vibrator starts to work to ensure that the contaminated soil in the storage bin 102 can smoothly enter the weighing bin 201.

[0067] like Figures 2 to 4 As shown, in order to reduce the volume of the equipment as much as possible and make the equipment easy to transport, the weighing bin 201 is arranged directly below the storage bin 102, and a plurality of weighing sensors 202 are evenly arranged below the weighing bin 201. A discharge port is arranged at the bottom of the weighing bin 201, and the first conveying part 3 includes a first conveying belt and a first motor 301 driving the first conveying belt to convey. The discharge port is arranged at the feeding end of the first conveying belt.

[0068] Specifically, the weighing bin 201 uses four weighing rods to connect the weighing sensor 202. The maximum range of a single weighing sensor 202 is 2.0t. Excluding the self-weight of the weighing bin 201 of 0.5t, the theoretical maximum weighing weight of the weighing bin 201 is 7.5t. A first conveyor belt is set at the bottom of the weighing bin 201. When the weighing weight reaches the set weight, the first conveyor belt starts to feed. The transmission speed of the conveyor belt is 1.2m / s, and the conveying power of the first motor 301 is an 11kw external reduction motor.

[0069] In addition, if Figure 1 The second conveying part 4 includes a conveying frame 401 and a second conveying belt 402 arranged on the conveying frame 401. The second conveying belt 402 is driven to rotate by a second motor 403. The feeding section of the second conveying belt 402 is located at the discharging end of the first conveying belt. The discharging section of the second conveying belt 402 is provided with a funnel 404. A connecting plate 405 is provided at one end of the conveying frame 401 close to the weighing device 2. The axial direction of the funnel 404 is provided with a flange 406 folded outwards. Both the flange 406 and the connecting plate 405 are provided with connecting holes.

[0070] The second conveying part 4 is connected and fixed to the weighing device 2 and the stirring device 5 respectively through the connecting plate 405 and the flange 406 of the funnel 404, and is bolted through the connecting hole and fixed by nuts to facilitate the disassembly of the second conveying part 4. The disassembly and assembly are convenient and can be quickly installed.

[0071] Specifically, the average thickness of the soil on the conveyor belt is designed to be 0.25m, the belt length is 6.0m, the width is 1.0m, and the belt has a width of 0.8m to carry the soil. According to the maximum time of conveying and feeding 10s, the weighing conveyor belt is 4 meters long, so the maximum moving distance of a single feeding is 10m, and the conveyor belt speed V is not less than 1m / s. Considering the safety factor, the corresponding belt transmission speed is 1.2m / s to ensure that the equipment meets the maximum contaminated soil treatment capacity. The second motor 403 of this embodiment is a 11kw reduction motor.

[0072] In addition, if Figure 7 and Figure 8 As shown, the stirring device 5 also includes a vertical shaft 509 disposed below the planetary gear 506 and a horizontal shaft 510 connected below the vertical shaft 509, and two connecting shafts 511 are arranged at an angle on the horizontal shaft 510. The two connecting shafts 511 of this embodiment are fixed to the horizontal shaft 510 by a clamp, and the angle thereof can be adjusted. The upper ends of the two connecting shafts 511 are fixed to the two ends of the horizontal shaft 510, and the lower ends of the connecting shafts 511 extend to the bottom of the stirring chamber 507. The stirring blade 502 is connected to the lower end of the connecting shaft 511, and the stirring blade 502 is 0.5 mm to 2 mm away from the bottom surface of the stirring chamber 507.

[0073] Furthermore, two connecting rods 512 are connected to the sun gear 505, and the connecting rods 512 extend into the stirring chamber 507, and a baffle 508 is provided at one end of each connecting rod 512 close to the bottom of the stirring chamber 507. A baffle 5021 is provided on the stirring blade 502, and the baffle 5021 protrudes from the upper plane of the stirring blade 502, and the baffle 5021 protrudes from the lower plane of the stirring blade 502. More than two baffles 5021 are arranged in parallel.

[0074] like Figure 7 The baffle 508 on the sun gear 505 is a fixed baffle 508. In other embodiments, a plurality of connecting rods 512 and baffles 508 evenly distributed and fixed around the circumference can be arranged along the axial direction of the sun gear 505. Such an arrangement can facilitate the baffle 508 to scrape off the adhered soil on the stirring blade 502 when the stirring blade 502 is adhered by the sticky soil during the rotation process. The baffle 508 of this embodiment can be an elastic sheet made of a material such as spring steel. Its strength needs to be greater than the resistance of the sticky soil.

[0075] In addition, the baffle 508 located at the center wheel 504 of this embodiment is also fixed by the connecting rod 512, and the connecting rod 512 can be fixed in the axial direction of the center wheel 504 by plugging or welding. The fixed position of the connecting rod 512 is adaptively adjusted by the relative position with the stirring blade 502, which is not limited here. In addition, the number of connecting rods 512 and baffles 508 can also be adaptively increased or decreased according to the properties of the soil to be repaired.

[0076] Specifically, as shown in the figure, the planetary gear structure of the stirring device 5 of this embodiment can refer to the prior art. This embodiment has conducted adjustment tests on the optimal angle of the high-speed stirring blade 502 and the optimal angle of the medium-speed stirring blade 502 during ectopic repair. It was measured that the optimal stirring blade 502 parameters are that the high-speed stirring blade 502 is tilted at 35° or 45°, and the baffle 5021 of the medium-speed stirring blade 502 is tilted at 45° or 60°, and the mixing effect is best. The vertical mixing and stirring capacity can be increased by nearly 1 times, and the horizontal stirring capacity can be increased by 14.48%-57.67%.

[0077] Among them, this embodiment tests soil samples at different speeds and heights in the stirring chamber 507. Specifically, 2 samples are randomly collected from the surface layer 0-30cm, the middle layer 30-60cm and the bottom layer 60-80 in the high-speed stirring zone (G), the medium-speed stirring zone (Z), and the low-speed stirring zone (D). A total of 6 samples are collected in each area, and the iron content is detected and the coefficient of difference in mixing uniformity is calculated. Each group of tests is carried out 3 times to calculate the average value. The stirring chamber is cleaned between each group of tests to prevent residual agents and soil from affecting the test results. The test results of the coefficient of difference in mixing uniformity in different area tests are as follows: Fig. 9 As shown:

[0078] Depend on Fig. 9It can be seen from the data that the mixing effect is best when the baffle 5021 of the medium-speed stirring blade 502 is tilted at 45° or 60°. The stirring device 5 of this embodiment adopts a medium-speed stirring blade 502, wherein the baffle 5021 located at the center wheel 504 is in a low-speed stirring state. The inclination angle of the stirring blade 502 can be automatically controlled by setting a power source such as a rotating motor between the stirring blade 502 and the connecting shaft, or the angle can be manually adjusted before stirring. In addition, the integrated ex situ soil remediation system of this embodiment also includes a dosing device 7 arranged on one side of the stirring device 5, and the dosing device 7 includes a dosing metering bucket 701 and a dosing bin 702. The dosing bin 702 is arranged above the stirring body 501, and a spiral conveyor belt is arranged between the dosing metering bucket 701 and the dosing bin 702. Specifically, the agent includes solid agent and liquid agent. Generally speaking, the mixing ratio of the agent to the soil is 2%-10%. Due to the large difference in the mixing ratio of the agent and the soil, the mixing capacity of the mixing equipment is greatly tested. The current soil mixing equipment has a mixing uniformity coefficient of about 15-25% after mixing. The mixing uniformity coefficient of this embodiment is below 15%, which can achieve better repair effects.

[0079] The method for using the integrated ex situ soil remediation system of this embodiment is as follows:

[0080] Step 1: The material to be repaired is transported to one of the feed bins of the feed device 1 through an external conveying device, and then screened by the screening part 101 of the feed bin and then enters the weighing bin 201 for weighing. When the weighed weight reaches the set weight, the discharge port of the weighing bin 201 is opened, and the material is transported through the first conveyor belt;

[0081] Step 2: The first conveyor belt conveys the material to the feeding section of the second conveyor belt 402, and the material conveyed by the second conveyor belt 402 enters the stirring chamber 507. At the same time, the dosing device 7 determines the required drug dosage through the dosing metering bin, and then conveys the drug to the dosing bin 702 through the spiral conveyor belt, and continues to dosing during the material stirring process;

[0082] Step 3: The dust collecting device 6 is started, so that the first dust collecting pipe 601, the second dust collecting pipe 602 and the third dust collecting pipe 603 generate negative pressure to collect dust between the feeding device 1 and the weighing device 2, at the outlet of the first conveying part 3 and the inlet of the second conveying part 4, and at the connection between the outlet of the second conveying part 4 and the inlet of the stirring device 5;

[0083] Step 4: The driving part 503 of the stirring device 5 is started to drive the planetary gear mechanism to rotate, so that the stirring blade 502 on the planetary wheel 506 rotates with the planetary wheel 506, and the baffle 508 on the sun wheel 505 rotates with the sun wheel 505, stirring the material in the stirring chamber 507, so that the material is fully integrated with the medicine in the stirring chamber 507 for repair;

[0084] Step 5: Step 3, Step 2 and Step 1 are carried out simultaneously, and the repaired material stirred in Step 4 is collected.

[0085] Since clay soil is more difficult to handle, the remediation speed is also slower. The treatment capacity is adjusted accordingly for different soils. The contaminated soil treatment capacity is between 60-150m3 / h (under different soil conditions). Fig.10 As shown:

[0086] This embodiment adopts an ex situ chemical reduction stabilized soil remediation process for typical hexavalent chromium contaminated sites such as leather making and electroplating. By using the integrated ex situ soil remediation system and its use method as described above, the hexavalent chromium contaminated soil can be remediated to 2 mg / kg below the national standard. The feeding speed is controlled by the feeding bin, the amount of contaminated soil added at a time is controlled by the weighing belt, and the contaminated soil and the agent are fully mixed by the mixing and stirring device, so that the remediation agent and the contaminated soil can be fully mixed and uniform, ensuring that the contaminated soil and the agent can be fully in contact, and preventing the remediation soil from turning yellow.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrated ex situ soil remediation system, characterized by: It comprises a feeding device (1), a weighing device arranged below the feeding device (1), wherein the weighing device is provided with a first conveying part for conveying soil; The delivery outlet of the first delivery part is connected to the second delivery part (4), and the delivery outlet of the second delivery part (4) is connected to the stirring device (5); The feeding port of the feeding device (1) is provided with a screening part (101) for vibrating and screening soil particles, and a dust collecting device (6) for collecting dust is provided between the stirring device (5) and the weighing device; The dust collecting device (6) comprises a first dust collecting pipe (601) provided between the feeding device (1) and the weighing device, a second dust collecting pipe (602) provided at the outlet of the first conveying part and the inlet of the second conveying part (4), and a third dust collecting pipe (603) provided at the outlet of the second conveying part (4) and the inlet of the stirring device (5); The first dust collecting pipe (601), the second dust collecting pipe (602) and the third dust collecting pipe (603) are connected in parallel to the inlet end of the dust collecting device (6), and a nozzle for spraying dust is provided in the dust collecting device (6), and the outlet of the dust collecting device (6) leads to the second conveying part (4); The stirring device (5) comprises a stirring body (501), a planetary gear mechanism, and a stirring blade (502); the planetary gear mechanism comprises a driving part (503), a center wheel (504) located on a center frame, a sun wheel (505) fixedly arranged on the stirring body (501), and a planetary wheel (506) arranged between the sun wheel (505) and the center wheel (504); the center wheel (504) is connected to the power output end of the driving part (503); The stirring body (501) has a stirring chamber (507) therein, the planetary gear mechanism is arranged above the stirring chamber (507), the stirring blade (502) is arranged on the planetary wheel (506), and the stirring blade (502) is arranged in the stirring chamber (507); the central wheel (504) is connected to a baffle (508) extending into the stirring chamber (507), the baffle (508) is made of elastic material, and the baffle (508) can be moved during the rotation of the stirring blade (502).

2. The integrated ex situ soil remediation system according to claim 1, characterized in that: The feeding device (1) comprises two storage bins (102) arranged in parallel, the weighing device comprises a weighing bin (201), and the outlets of the two storage bins (102) are located above the weighing bins (201).

3. The integrated ex situ soil remediation system according to claim 2, characterized in that: A plurality of weighing sensors (202) are evenly distributed below the weighing bin (201), a discharge port is provided at the bottom of the weighing bin (201), and the first conveying section comprises a first conveying belt and a first motor (301) for driving the first conveying belt for conveying; The discharge port is arranged at the feed end of the first conveyor belt.

4. The integrated ex situ soil remediation system according to claim 3, characterized in that: The second conveying part (4) comprises a conveying frame (401) and a second conveying belt (402) arranged on the conveying frame (401); the second conveying belt (402) is driven to rotate by a second motor (403); a feeding section of the second conveying belt (402) is located at a discharging end of the first conveying belt; and a funnel (404) is provided at the discharging section of the second conveying belt (402).

5. The integrated ex situ soil remediation system according to claim 4, characterized in that: A connecting plate (405) is provided at one end of the conveying frame (401) close to the weighing device, and an outwardly folded flange (406) is provided axially on the funnel (404), and connecting holes are provided on the flange (406) and the connecting plate (405).

6. The integrated ex situ soil remediation system according to claim 1, characterized in that: The stirring device (5) further comprises a vertical shaft (509) arranged below the planetary gear (506) and a horizontal shaft (510) connected below the vertical shaft (509); two connecting shafts (511) are arranged on the horizontal shaft (510) at a preset angle, and the upper ends of the two connecting shafts (511) are fixed to the two ends of the horizontal shaft (510); the lower ends of the connecting shafts (511) extend toward the bottom of the stirring chamber (507); the stirring blade (502) is connected to the lower end of the connecting shaft (511); and the stirring blade (502) is 0.5 mm to 2 mm away from the bottom surface of the stirring chamber (507).

7. The integrated ex situ soil remediation system according to claim 6, characterized in that: One or more connecting rods (512) are connected to the sun gear (505), the connecting rods (512) extend into the stirring chamber (507), and the baffle (508) is provided at one end of each connecting rod (512) close to the bottom of the stirring chamber (507).

8. The integrated ex situ soil remediation system according to claim 7, characterized in that: The stirring blade (502) is provided with a baffle (5021), the baffle (5021) protrudes from the upper plane of the stirring blade (502), and / or the baffle (5021) protrudes from the lower plane of the stirring blade (502); The two or more baffles (5021) are arranged in parallel.

9. The integrated ex situ soil remediation system according to claim 3, characterized in that: It also includes a dosing device (7) arranged on one side of the stirring device (5), the dosing device (7) comprising a dosing metering hopper (701) and a dosing bin (702), the dosing bin (702) being arranged above the stirring body (501), and a spiral conveyor belt being arranged between the dosing metering hopper (701) and the dosing bin (702).

10. The method for using the integrated ex situ soil remediation system according to any one of claims 1 to 9, characterized in that: Step 1: The material to be repaired is transported to a feed bin of the feed device (1) through an external conveying device, is screened by the screening part (101) of the feed bin, and then enters the weighing bin (201) for weighing. When the weighed weight reaches a set weight, the discharge port of the weighing bin (201) is opened, and the material is transported through the first conveyor belt; Step 2: The first conveyor belt conveys the material to the feeding section of the second conveyor belt (402), and the material is conveyed by the second conveyor belt (402) into the stirring chamber (507). At the same time, the dosing device (7) determines the required dosage of the drug through the dosing metering bin, and then conveys the drug to the dosing bin (702) through the spiral conveyor belt, and the drug is continuously added during the material stirring process; Step 3: The dust collecting device (6) is started, so that the first dust collecting pipe (601), the second dust collecting pipe (602) and the third dust collecting pipe (603) generate negative pressure to collect dust between the feeding device (1) and the weighing device, at the outlet of the first conveying part and the inlet of the second conveying part (4), and at the connection between the outlet of the second conveying part (4) and the inlet of the stirring device (5); Step 4: The driving part (503) of the stirring device (5) is started to drive the planetary gear mechanism to rotate, so that the stirring blade (502) on the planetary wheel (506) rotates along with the planetary wheel (506), and the baffle (508) on the sun wheel (505) rotates along with the sun wheel (505), stirring the material in the stirring chamber (507), so that the material is fully integrated with the medicine in the stirring chamber (507) for repair; Step 5: Step 3, Step 2 and Step 1 are carried out simultaneously, and the repaired material stirred in Step 4 is collected.

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