A decontamination separation apparatus and method for uranium-contaminated soil based on chemical elution

Abstract

The present application relates to the technical field of soil remediation, and particularly discloses a decontamination and separation device and method for uranium-containing contaminated soil based on chemical leaching, which comprises a separation device shell, an inlet cylinder for feeding is arranged in the separation device shell, a leaching liquid mixing box for leaching of the uranium-containing contaminated soil is arranged at the rear side of the inlet cylinder, a turnover plate for digging of the uranium-containing contaminated soil is installed at the front side of the inlet cylinder, a moving wheel for walking is installed at the bottom of the separation device shell, and a protective cover for shielding of the soil is fixed at the front side of the separation device shell. When the turnover plate moves counterclockwise, the soil is scattered by separation teeth, when the turnover plate rotates clockwise, the scattered soil is dug out and thrown to an inlet inclined plate and then enters the inlet cylinder, and the soil is fed by spiral blades in the inlet cylinder, so that the soil does not need to be manually dug, the digging and feeding can be simultaneously performed, and the work efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of soil remediation, and particularly relates to a decontamination and separation device and method for uranium-containing contaminated soil based on chemical leaching. BACKGROUND

[0002] With the exploitation of uranium mines, nuclear weapon tests and the extensive use of nuclear energy, uranium is continuously enriched and contaminated in the environment. Improper accumulation or disposal of these waste materials can cause uranium to be dispersed to the soil surface through runoff, enter the air through wind erosion, or enter groundwater through leaching; uranium mines produce a large amount of radioactive wastewater that is continuously discharged, which also directly contaminates natural water bodies and soil. Therefore, the treatment and remediation of uranium-contaminated soil are increasingly attracting attention.

[0003] Soil leaching is a chemical remediation method that mixes a leaching agent with soil to transfer pollutants from the solid phase to the liquid phase, thereby reducing the total amount of soil pollutants. Soil leaching remediation is stable, and by selecting different leaching agents and leaching methods, leaching technology can be applied to different types of contaminated soil. For example, the patent specification with publication number CN112496024A discloses a decontamination and separation method for uranium-containing contaminated soil based on chemical leaching, which uses a specific leaching agent to leach uranium-containing contaminated soil to achieve soil remediation.

[0004] When leaching uranium-containing contaminated soil chemically, in-situ soil leaching may contaminate groundwater, thereby expanding the extent of uranium contamination. Therefore, ex-situ soil leaching is usually used to excavate uranium-containing contaminated soil, remove oversized components through screening, then wash and remove pollutants using a leaching agent, treat the leachate containing pollutants, and backfill or transport the clean soil to another location.

[0005] In this process, a chemical leaching device for soil remediation disclosed in the patent specification with publication number CN109482636B is used to feed raw materials into the box through the feeding pipe and make the raw materials fully contact with the leaching agent through the stirring device. The generated heat is uniformly and rapidly conducted to the soil, improving the volatilization efficiency of organic matter in the soil, promoting the upward lifting and dispersion of the raw materials, promoting the contact area of organic matter in the raw materials with air, promoting volatilization, and promoting the degree of complete reaction with the chemical solution.

[0006] However, it is found in the implementation of the related technology that the above technical solution has the following problems: the chemical leaching device needs to be manually excavated to put the uranium-containing contaminated soil into the chemical leaching box for leaching. The excavation device and the leaching device are separate structures, and the next process can only be performed after the previous process is completed, which is low in work efficiency. Therefore, a decontamination and separation device and method for uranium-containing contaminated soil based on chemical leaching are provided to overcome the above defects. SUMMARY

[0007] The present application aims at solving the problems existing in the prior art and provides a chemical leaching based decontamination and separation device and method for uranium contaminated soil.

[0008] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: a chemical leaching based decontamination and separation device and method for uranium contaminated soil, comprising a separation device shell, an inside of the separation device shell is provided with a feeding cylinder for feeding, a rear side of the feeding cylinder is provided with a leaching liquid mixing box for leaching of the uranium contaminated soil, and a front side of the feeding cylinder is installed with a turnover plate for digging of the uranium contaminated soil, a bottom of the separation device shell is installed with a moving wheel for walking, and a front side of the separation device shell is fixed with a protective cover for shielding of the soil, a connecting pipe is installed at a connection between the leaching liquid mixing box and the feeding cylinder, and a rear side of the leaching liquid mixing box is provided with a liquid outlet at a lower side, and a front side of the feeding cylinder is installed with a feeding inclined plate at a lower side.

[0009] An end of the turnover plate is provided with a plurality of separation teeth of hook-shaped structure which are uniformly distributed at equal intervals, a connecting shaft is fixedly arranged in the inside of the turnover plate, and the turnover plate is distributed in an X shape on the connecting shaft, a driving gear is installed at one end of the connecting shaft, and a driving rack is arranged above the driving gear, and a non-detaching head is connected to one end of the driving rack, the driving gear can drive the turnover plate to rotate through the connecting shaft, the scattered soil can be dug into the turnover plate when the turnover plate rotates clockwise, and the soil is put into the feeding inclined plate and then into the feeding cylinder under the action of the turnover plate, and the hook-shaped part of the separation tooth can contact with the soil when the turnover plate rotates counterclockwise, so that the scattered soil is convenient for soil sampling.

[0010] A spiral blade is installed in the inside of the feeding cylinder, a rotating shaft for driving the spiral blade is arranged at the center of the spiral blade, a driven gear is installed at a power input end of the rotating shaft, a transmission gear is arranged at one side of the driven gear, a driving gear is installed below the driven gear, and a transmission shaft is arranged in the inside of the driving gear, an end of the transmission shaft is connected to a power output end of a servo motor, and the servo motor is fixed on the separation device shell, the transmission direction of the transmission shaft can be changed through the bevel gear set structure, and then the spiral blade is driven to rotate through the rotating shaft, so as to realize soil feeding.

[0011] The other end of the transmission shaft is fixedly connected with a rotating disc, and the surface of the rotating disc is provided with a sliding block, the sliding block is away from the axis of the transmission shaft, and the outside of the sliding block is sleeved with a sliding ring, the middle of the sliding ring is fixedly provided with a reciprocating rod on both sides, and the outside of the reciprocating rod is sleeved with a limiting block, the limiting block is welded on the separation device shell, and the anti-dropping head is fixedly connected with the end of the reciprocating rod, when the rotating disc drives the sliding block to rotate, the sliding block slides in the sliding ring, so that the sliding ring slides back and forth on the surface of the rotating disc, the rotary motion is converted into linear reciprocating motion, and the reciprocating rod drives the driving rack to move back and forth.

[0012] As a further description of the above technical scheme: the inside of the elution liquid mixing box is provided with a centrifugal basket which is attached to the inner wall of the elution liquid mixing box, and the inside of the centrifugal basket is provided with a suction box, and the inside of the suction box is provided with a suction pump, which can suck the filtrate filtered by the centrifugal basket and discharge it outward through the suction box.

[0013] As a further description of the above technical scheme: the top of the suction box is provided with two groups of symmetrically arranged water spray heads, and the left and right sides of the suction box are provided with liquid inlet holes, and the inside of the liquid inlet holes is provided with a filter screen, which can filter the soil and prevent the soil from entering the suction box.

[0014] As a further description of the above technical scheme: the top of the suction box is provided with a first stirring shaft and a second stirring shaft which are parallel to each other, the middle of the first stirring shaft and the second stirring shaft is provided with a power blade, and the left and right sides of the power blade is provided with a stirring blade, the first stirring shaft and the second stirring shaft which are parallel to each other rotate in opposite directions, and the power blade provides power source.

[0015] As a further description of the above technical scheme: the stirring blades on the first stirring shaft and the second stirring shaft are arranged alternately, and when the alternately arranged stirring blades rotate, the soil and the elution liquid in the elution liquid mixing box can be fully stirred, so that the elution liquid fully acts on the soil.

[0016] As a further description of the above technical scheme: the vertical center line of the power blade and the water spray head is located in the same vertical plane, the water spray directions of the two groups of water spray heads are respectively towards the two groups of power blades, the water column sprayed by the water spray head can directly hit the power blade to make the power blade rotate, and because the water spray directions of the water spray heads are symmetrically arranged, the two groups of power blades can be driven to rotate in opposite directions.

[0017] As a further description of the above technical scheme: the top of the first stirring shaft and the second stirring shaft is provided with a baffle, and the top of the baffle is provided with a conveyor belt which is parallel to the baffle, and the baffle can divide the elution liquid mixing box.

[0018] As a further description of the above technical solution: the length of the conveying belt is greater than the length of the baffle, and a leaching pipe is installed above the conveying belt, and the uranium-containing contaminated soil is directly conveyed out from the end of the conveying belt and falls into the inside of the leaching liquid mixing box.

[0019] As a further description of the above technical solution: the bottom of the leaching pipe is provided with a plurality of leaching nozzles which are uniformly distributed at equal intervals, and the spraying direction of the leaching nozzles is perpendicular to the conveying belt, and the leaching liquid is discharged downward by the leaching nozzles after passing through the leaching pipe, so that the uranium-containing contaminated soil on the conveying belt can be preliminarily leached.

[0020] As a further description of the above technical solution: a decontamination and separation method for uranium-containing contaminated soil based on chemical leaching, comprising the following steps:

[0021] S1, soil excavation: when the sliding block is rotated by the rotating disc, the sliding block slides in the sliding ring, so that the sliding ring slides back and forth on the surface of the rotating disc, and the reciprocating rod drives the driving rack to move back and forth, and when the driving rack moves forward, the driving gear is driven to rotate counterclockwise, so that the separated teeth on the turnover plate scatter the soil;

[0022] S2, soil feeding: when the driving rack moves backward, the driving gear is driven to rotate counterclockwise, so that the scattered soil is dug out by the turnover plate and thrown upward to the feeding inclined plate, and then enters the feeding cylinder along the inclined feeding inclined plate, and then enters the leaching liquid mixing box through the spiral blade;

[0023] S3, chemical leaching: the uranium-containing contaminated soil is directly conveyed out from the end of the conveying belt and falls into the inside of the leaching liquid mixing box, and the leaching liquid is discharged downward by the leaching nozzles after passing through the leaching pipe, so that the uranium-containing contaminated soil on the conveying belt is preliminarily leached;

[0024] S4, stirring and mixing: the filtrate is sucked into the two groups of water spray heads by the suction pump, and the water column sprayed by the water spray heads can directly hit the power blades to make the power blades rotate, so that the first stirring shaft and the second stirring shaft rotate in opposite directions, and the stirring blades intersect with each other when rotating to stir the soil and the leaching liquid in the leaching liquid mixing box;

[0025] S5, solid-liquid separation: the waste liquid is filtered and separated by the centrifugal basket, and then discharged from the liquid outlet and collected uniformly, and then treated by the wastewater treatment system.

[0026] The present application has the following beneficial effects:

[0027] The application discloses a decontamination and separation device for uranium-containing contaminated soil based on chemical elution, a turnover plate is arranged below a protective cover, the turnover plate is driven to move counterclockwise, and the soil is scattered through separation teeth, the scattered soil is dug out and thrown to a feeding inclined plate and then enters a feeding cylinder when the turnover plate rotates clockwise, and the soil is fed through spiral blades in the feeding cylinder, manual digging of the soil is not needed, the digging and feeding can be synchronously performed, and the working efficiency is improved.

[0028] The application discloses a decontamination and separation device for uranium-containing contaminated soil based on chemical elution, a turnover plate is arranged below a protective cover, the turnover plate is driven to move counterclockwise, and the soil is scattered through separation teeth, the scattered soil is dug out and thrown to a feeding inclined plate and then enters a feeding cylinder when the turnover plate rotates clockwise, and the soil is fed through spiral blades in the feeding cylinder, manual digging of the soil is not needed, the digging and feeding can be synchronously performed, and the working efficiency is improved.

[0029] The application discloses a decontamination and separation device for uranium-containing contaminated soil based on chemical elution, a turnover plate is arranged below a protective cover, the turnover plate is driven to move counterclockwise, and the soil is scattered through separation teeth, the scattered soil is dug out and thrown to a feeding inclined plate and then enters a feeding cylinder when the turnover plate rotates clockwise, and the soil is fed through spiral blades in the feeding cylinder, manual digging of the soil is not needed, the digging and feeding can be synchronously performed, and the working efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a perspective structural schematic view of the application;

[0031] Figure 2 It is a sectional structural schematic view of the application;

[0032] Figure 3 It is a structural schematic view of the rotating disc of the application;

[0033] Figure 4 It is an enlarged view of A in the middle; Figure 2

[0034] Figure 5 It is a structural schematic view of the driving gear of the application;

[0035] Figure 6 It is a structural schematic view of the first stirring shaft and the second stirring shaft of the application;

[0036] Figure 7 It is a structural schematic view of the rotating disc and the slip ring of the application when being separated;

[0037] Figure 8 It is a structural schematic view of the separation tooth of the application.

[0038] LEGEND

[0039] ​1, separation device housing; 2, elution liquid mixing box; 3, feed cylinder; 4, protective cover; 5, servo motor; 6, elution pipe; 7, conveying belt; 8, baffle; 9, first stirring shaft; 10, power vane; 11, stirring vane; 12, liquid outlet; 13, suction box; 14, suction pump; 15, filter screen; 16, second stirring shaft; 17, water jet head; 18, driven gear; 19, spiral vane; 20, feed inclined plate; 21, communication pipe; 22, transmission gear; 23, driving gear; 24, transmission shaft; 25, sliding block; 26, slip ring; 27, reciprocating rod; 28, rotating disc; 29, limiting block; 30, anti-off head; 31, driving gear; 32, driving rack; 33, separation tooth; 34, turnover plate; 35, connecting shaft; 36, centrifugal basket. DETAILED DESCRIPTION

[0040] REFERENCE Figures 1-8 The present application provides a kind of based on chemical elution of uranium contaminated soil decontamination separation device: including separation device housing 1, the inside of separation device housing 1 is provided with the feed cylinder 3 for feeding, the rear side of feed cylinder 3 is provided with the elution liquid mixing box 2 for uranium contaminated soil elution, and the front side of feed cylinder 3 is installed with the turnover plate 34 for digging uranium contaminated soil, the bottom of separation device housing 1 is installed with the mobile wheel for walking, and the front side of separation device housing 1 is fixed with the protective cover 4 for shielding soil, the connecting place of elution liquid mixing box 2 and feed cylinder 3 is installed with communication pipe 21, and the rear side of elution liquid mixing box 2 is provided with liquid outlet 12 in lower side, the front side of feed cylinder 3 is installed with feed inclined plate 20 in lower side,

[0041] The end of turnover plate 34 is provided with a plurality of equidistant uniform distribution's hook type structure's separation tooth 33, turnover plate 34 is fixed with connecting shaft 35 in the inside, and turnover plate 34 is distributed in X shape on connecting shaft 35, one end of connecting shaft 35 is installed with driving gear 31, and driving gear 31 is provided with driving rack 32 in upper side, one end of driving rack 32 is connected with anti-off head 30, driving gear 31 can drive turnover plate 34 to rotate through connecting shaft 35, when turnover plate 34 rotates clockwise, it can dig the soil that is scattered into turnover plate 34, and under the action of turnover plate 34, it is thrown into feed inclined plate 20 into feed cylinder 3, while turnover plate 34 rotates counterclockwise, the hook part of separation tooth 33 can be contacted with soil, and the soil is scattered to facilitate soil sampling;

[0042] The inside of the feeding cylinder 3 is provided with a spiral blade 19, and the center of the spiral blade 19 is provided with a rotating shaft for driving the spiral blade 19, the power input end of the rotating shaft is provided with a driven gear 18, one side of the driven gear 18 is provided with a transmission gear 22, the lower part of the driven gear 18 is provided with a driving gear 23, the inside of the driving gear 23 is provided with a transmission shaft 24, the end of the transmission shaft 24 is connected with the power output end of the servo motor 5, and the servo motor 5 is fixed on the separation device shell 1. The transmission direction of the transmission shaft 24 can be changed through the bevel gear set structure, and then the spiral blade 19 is driven to rotate by the rotating shaft, so as to realize the soil feeding.

[0043] The other end of the transmission shaft 24 is fixedly connected with a rotating disc 28, the surface of the rotating disc 28 is provided with a sliding block 25, the sliding block 25 is away from the axis of the transmission shaft 24, the outside of the sliding block 25 is sleeved with a sliding ring 26, the two sides of the middle part of the sliding ring 26 are fixedly provided with reciprocating rods 27, the outside of the reciprocating rods 27 is sleeved with limiting blocks 29, the limiting blocks 29 are welded on the separation device shell 1, and a anti-dropping head 30 is fixedly connected with the end of the reciprocating rods 27. When the rotating disc 28 drives the sliding block 25 to rotate, the sliding block 25 slides in the sliding ring 26, so as to drive the sliding ring 26 to slide back and forth on the surface of the rotating disc 28, and convert the rotary motion into linear reciprocating motion, and drive the driving rack 32 to move back and forth through the reciprocating rods 27.

[0044] As a further embodiment of the above technical solution: the inside of the elution liquid mixing box 2 is provided with a centrifugal basket 36 which is attached to the inner wall of the elution liquid mixing box 2, and the inside of the centrifugal basket 36 is provided with a suction box 13, and the inside of the suction box 13 is provided with a suction pump 14. The suction pump 14 can suck the filtrate filtered by the centrifugal basket 36 and discharge it outward through the suction box 13.

[0045] As a further embodiment of the above technical solution: the top of the suction box 13 is provided with two groups of symmetrically arranged water spray heads 17, and the left and right sides of the suction box 13 are provided with liquid inlet holes, and the inside of the liquid inlet holes is provided with filter screens 15. The filter screens 15 can filter the soil to prevent the soil from entering the suction box 13.

[0046] As a further embodiment of the above technical solution: the top of the suction box 13 is provided with a first stirring shaft 9 and a second stirring shaft 16 which are parallel to each other, the middle part of the first stirring shaft 9 and the second stirring shaft 16 is provided with a power blade 10, and the left and right sides of the power blade 10 is provided with stirring blades 11. The first stirring shaft 9 and the second stirring shaft 16 which are parallel to each other rotate in opposite directions, and the power blade 10 provides the power source.

[0047] As a further implementation of the above technical solution: the stirring blades 11 on the first stirring shaft 9 and the second stirring shaft 16 are staggered with each other, and when the staggered stirring blades 11 rotate, the soil and the leaching solution in the leaching solution mixing box 2 can be fully stirred, so that the leaching solution fully acts on the soil.

[0048] As a further implementation of the above technical solution: the power blade 10 and the vertical center line of the water jet head 17 are located in the same vertical plane, the water jet directions of the two groups of water jet heads 17 are respectively towards the two groups of power blades 10, and the water column sprayed by the water jet head 17 can directly hit the power blade 10 to make the power blade 10 rotate, and because the water jet directions of the water jet heads 17 are symmetrically arranged, the two groups of power blades 10 can be driven to rotate in opposite directions.

[0049] As a further implementation of the above technical solution: the first stirring shaft 9 and the second stirring shaft 16 are provided with a baffle 8 above, and a conveying belt 7 is arranged in parallel above the baffle 8, and the baffle 8 can divide the leaching solution mixing box 2.

[0050] As a further implementation of the above technical solution: the length of the conveying belt 7 is greater than the length of the baffle 8, and a leaching pipe 6 is installed above the conveying belt 7, and the uranium-contaminated soil is directly conveyed out from the end of the conveying belt 7 and falls into the inside of the leaching solution mixing box 2.

[0051] As a further implementation of the above technical solution: the bottom of the leaching pipe 6 is provided with a plurality of leaching nozzles which are evenly distributed at equal intervals, and the spraying directions of the leaching nozzles are perpendicular to the conveying belt 7, and the leaching solution is discharged downward by the leaching nozzles after passing through the leaching pipe 6, so as to preliminarily leach the uranium-contaminated soil on the conveying belt 7.

[0052] In actual implementation, the separation device housing 1 is pushed to the area of the uranium-contaminated soil to be treated by chemical leaching through the mobile wheels at the bottom, the separation device housing 1 is moved, and the servo motor 5 is started, the servo motor 5 can rotate through the transmission shaft 24, thereby driving the rotating disc 28 to rotate, at this time, the sliding block 25 on the rotating disc 28 slides in the sliding ring 26, and the sliding ring 26 moves forward and backward while the sliding block 25 slides in the sliding ring 26, at this time, the sliding ring 26 drives the reciprocating rod 27 to slide in the limiting block 29, thereby pushing the driving rack 32 forward through the anti-dropping head 30, the driving gear 31 moves counterclockwise, and the separated teeth 33 on the turnover plate 34 are in contact with the soil, and the soil is scattered when the driving gear 31 rotates, when the driving rack 32 moves backward, the driving gear 31 moves counterclockwise, thereby the scattered soil is dug out through the turnover plate 34 and thrown upward and backward to the feeding inclined plate 20, enters the feeding cylinder 3 along the inclined feeding inclined plate 20, and is pushed upward through the spiral blade 19 and enters the leaching liquid mixing box 2 through the communication pipe 21, moves to the top of the conveying belt 7, and is thrown into the leaching liquid mixing box 2 from the last end of the conveying belt 7, and the appropriate leaching liquid is sprayed through the leaching spray head on the leaching pipe 6 while being conveyed, and after preliminary mixing, enters the stirring area, after mixing with the soil, part of the leaching liquid is filtered through the centrifugal basket 36, the suction pump 14 in the suction box 13 can be started, the leaching liquid is sucked into the suction pump 14 through the filter screen 15, and is sprayed through the water spraying head 17, the water column sprayed by the water spraying head 17 can directly hit the power blade 10 to make the power blade 10 rotate, thereby driving the first stirring shaft 9 and the second stirring shaft 16 to rotate in opposite directions, the stirring blades 11 rotate in opposite directions, and the soil and the leaching liquid in the leaching liquid mixing box 2 are stirred again, the leaching liquid and the soil are fully reacted, after the reaction is completed, the waste liquid can be discharged outward through the liquid outlet 12.

[0053] A soil decontamination and separation method based on chemical leaching of uranium-contaminated soil, comprising the following steps:

[0054] S1, soil excavation: when the rotating disc 28 drives the sliding block 25 to rotate, the sliding block 25 slides in the sliding ring 26, the sliding ring 26 slides forward and backward on the surface of the rotating disc 28, the driving rack 32 is driven to move forward and backward through the reciprocating rod 27, when the driving rack 32 moves forward, the driving gear 31 moves counterclockwise, thereby the separated teeth 33 on the turnover plate 34 scatter the soil;

[0055] S2, soil feeding: when the driving rack 32 moves backward, the driving gear 31 moves counterclockwise, thereby the scattered soil is dug out through the turnover plate 34 and thrown upward and backward to the feeding inclined plate 20, enters the feeding cylinder 3 along the inclined feeding inclined plate 20, and enters the leaching liquid mixing box 2 through the spiral blade 19;

[0056] S3, chemical elution: the uranium-containing contaminated soil is directly conveyed from the end of the conveying belt 7, falls in the inside of the elution liquid mixing box 2, the elution liquid is discharged downward by the elution nozzle after passing through the elution pipe 6, and the uranium-containing contaminated soil on the conveying belt 7 is preliminarily eluted;

[0057] S4, stirring and mixing: the filtrate is sucked by the suction pump 14, sprayed out by the two groups of water spraying heads 17, the water column sprayed out by the water spraying heads 17 can directly hit the power blades 10 to make the power blades 10 rotate, thereby driving the first stirring shaft 9 and the second stirring shaft 16 to rotate in opposite directions, and the stirring blades 11 are rotated to stir the soil and the elution liquid in the elution liquid mixing box 2.

[0058] S5, solid-liquid separation: the waste liquid is filtered and separated by the centrifugal basket 36, discharged from the liquid outlet 12, uniformly collected, and then subjected to waste water treatment by the waste water treatment system.

[0059] Finally, it should be noted that: the above is only the preferred embodiment of the present application, and is not used to limit the present application, although the present application is described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A decontamination separation device for uranium-containing contaminated soil based on chemical elution, comprising a separation device housing (1), the inside of the separation device housing (1) is provided with a feeding cylinder (3) for feeding, the rear side of the feeding cylinder (3) is provided with an elution liquid mixing box (2) for elution of uranium-containing contaminated soil, and the front side of the feeding cylinder (3) is provided with a turnover plate (34) for digging uranium-containing contaminated soil, the bottom of the separation device housing (1) is provided with a moving wheel for walking, and the front side of the separation device housing (1) is fixed with a protective cover (4) for shielding soil, characterized in that: The connecting pipe (21) is installed at the joint of the elution liquid mixing box (2) and the feeding cylinder (3), and the liquid outlet (12) is arranged at the lower side of the rear of the elution liquid mixing box (2); the feeding inclined plate (20) is installed at the lower side of the front of the feeding cylinder (3). The end of the turnover plate (34) is provided with a plurality of uniformly distributed separation teeth (33) in hook-shaped structure, the inside of the turnover plate (34) is provided with a connecting shaft (35) penetratingly arranged, the turnover plate (34) is distributed in X shape on the connecting shaft (35), one end of the connecting shaft (35) is provided with a driving gear (31), and the driving rack (32) is arranged above the driving gear (31), one end of the driving rack (32) is connected with the anti-off head (30). The inside of the feeding cylinder (3) is provided with a spiral blade (19), the center of the spiral blade (19) is provided with a rotating shaft for driving the spiral blade (19), the power input end of the rotating shaft is provided with a driven gear (18), one side of the driven gear (18) is provided with a transmission gear (22), the lower side of the driven gear (18) is provided with a driving gear (23), the inside of the driving gear (23) is provided with a transmission shaft (24), the end of the transmission shaft (24) is connected with the power output end of the servo motor (5), and the servo motor (5) is fixed on the separation device shell (1). The other end of the transmission shaft (24) is fixedly connected with a rotating disc (28), the surface of the rotating disc (28) is provided with a sliding block (25), the sliding block (25) is away from the axis of the transmission shaft (24), the outside of the sliding block (25) is sleeved with a sliding ring (26), the two sides of the middle of the sliding ring (26) are fixedly provided with reciprocating rods (27), the outside of the reciprocating rods (27) is sleeved with limiting blocks (29), the limiting blocks (29) are welded on the separation device shell (1), and the anti-off head (30) is fixedly connected with the ends of the reciprocating rods (27).

2. A decontamination separation unit for chemically eluted uranium contaminated soil according to claim 1, characterized in that: The inside of the elution liquid mixing box (2) is provided with a centrifugal basket (36) which is attached to the inner wall of the elution liquid mixing box (2), and the inside of the centrifugal basket (36) is provided with a suction box (13), and the inside of the suction box (13) is provided with a suction pump (14).

3. A decontamination separation apparatus for chemically eluted uranium contaminated soil according to claim 2, characterized in that: The top of the suction box (13) is provided with two groups of symmetrically arranged water spraying heads (17), and the left and right sides of the suction box (13) are provided with liquid inlet holes, and the inside of the liquid inlet holes is provided with filter screens (15).

4. A decontamination separation apparatus for chemically eluted uranium contaminated soil according to claim 3, characterized in that: The upper side of the suction box (13) is provided with a first stirring shaft (9) and a second stirring shaft (16) which are parallel to each other, the middle of the first stirring shaft (9) and the second stirring shaft (16) are provided with power blades (10), and the left and right sides of the power blades (10) are provided with stirring blades (11).

5. A decontamination separation apparatus for chemically eluted uranium contaminated soil according to claim 4, characterized in that: The stirring blades (11) on the first stirring shaft (9) and the second stirring shaft (16) are arranged in a staggered manner.

6. A decontamination separation apparatus for chemically eluted uranium contaminated soil according to claim 5, characterized in that: The vertical center lines of the power blades (10) and the water spraying heads (17) are located in the same vertical plane, and the water spraying directions of the two groups of water spraying heads (17) are respectively towards the two groups of power blades (10).

7. A decontamination separation apparatus for chemically eluted uranium contaminated soil according to claim 6, characterized in that: The first stirring shaft (9) and the second stirring shaft (16) are provided with a baffle (8) above, and the baffle (8) is provided with a conveying belt (7) above in parallel.

8. A decontamination separation apparatus for chemically eluted uranium contaminated soil according to claim 7, characterized in that: The length of the conveying belt (7) is greater than the length of the baffle (8), and the conveying belt (7) is provided with a leaching pipe (6) above.

9. A decontamination separation apparatus for chemically eluted uranium contaminated soil according to claim 8, characterized in that: The bottom of the leaching pipe (6) is provided with a plurality of leaching nozzles uniformly distributed at equal intervals, and the spraying direction of the leaching nozzles is perpendicular to the conveying belt (7).

10. A method of decontaminating and separating a uranium-contaminated soil using the decontaminating and separating apparatus based on chemical elution according to claim 9, characterized by: The method comprises the following steps: S1, soil excavation: when the sliding block (25) is rotated by the rotating disc (28), the sliding block (25) slides in the sliding ring (26), so that the sliding ring (26) slides back and forth on the surface of the rotating disc (28), and the reciprocating rod (27) drives the driving rack (32) to move back and forth, and when the driving rack (32) moves forward, the driving gear (31) rotates counterclockwise, so that the separated teeth (33) on the turnover plate (34) dig and scatter the soil; S2, soil feeding: when the driving rack (32) moves backward, the driving gear (31) rotates counterclockwise, so that the scattered soil is dug out by the turnover plate (34) and thrown upward and backward to the feeding inclined plate (20), and then enters the feeding cylinder (3) along the inclined feeding inclined plate (20), and then enters the leaching liquid mixing box (2) through the spiral blade (19); S3, chemical leaching: the uranium-containing contaminated soil is directly conveyed out from the end of the conveying belt (7) and falls into the leaching liquid mixing box (2), and the leaching liquid is discharged downward by the leaching nozzles after passing through the leaching pipe (6), and the uranium-containing contaminated soil on the conveying belt (7) is preliminarily leached; S4, stirring and mixing: the filtrate is sucked into the suction pump (14) and then sprayed out through the two groups of water spraying heads (17), the water column sprayed out by the water spraying heads (17) can directly hit the power blades (10) to make the power blades (10) rotate, so as to drive the first stirring shaft (9) and the second stirring shaft (16) to rotate in opposite directions, and the interlaced stirring blades (11) rotate to stir the soil and the leaching liquid in the leaching liquid mixing box (2); S5, solid-liquid separation: the waste liquid is filtered and separated by the centrifugal basket (36), and then discharged from the liquid outlet (12) for unified collection and then treated by the wastewater treatment system.

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