A leaching device for multi-sandstone heavy metal contaminated sediment

Abstract

The application discloses a leaching device for multi-sandstone heavy metal contaminated sediment, and relates to the technical field of sediment treatment devices. The leaching device comprises a leaching mechanism and a microbial agent adding device. The leaching mechanism comprises a leaching barrel, the leaching barrel is provided with a feeding hopper, the leaching barrel is provided with a driving motor, a rotating shaft is connected to the driving motor, a gravel screening net, a coarse sand screening net, a fine sand screening net and a stirring shaft are arranged on the rotating shaft, slip rings are connected to the gravel screening net, the coarse sand screening net and the fine sand screening net, a discharge port is formed in the leaching barrel, and a sealing door is rotatably and sealingly connected to the discharge port. Three groups of spraying assemblies are arranged on the leaching barrel and are communicated with the lower side of the leaching barrel, a circulating pipe is communicated with a water pump, and the microbial agent adding device is communicated with the leaching barrel. The present application solves the problem of poor heavy metal leaching effect of the existing sediment leaching device when leaching the sediment, and is suitable for treating heavy metals in the sediment.

Description

TECHNICAL FIELD

[0001] The application discloses a leaching device for heavy metal contaminated sediment with multiple sandstones, and relates to the technical field of sediment treatment devices. BACKGROUND

[0002] One of the most important pollutants in rivers and lakes is heavy metals, which is a persistent pollutant and is difficult to remove once it enters the environment. Once water bodies are contaminated by heavy metals, heavy metals often deposit into sediment along with fine suspended solids in the water body. The heavy metal pollutants accumulated in the sediment are not fixed and will be released into the water body again to cause secondary pollution when conditions such as pH and water temperature change.

[0003] In view of the above problems, the Chinese patent (patent publication number: CN110372164B) discloses a sediment treatment device based on river heavy metal pollution. The microbial leaching mechanism includes multiple layers of screen mechanisms arranged in layers. Each layer of screen mechanism is provided with a corresponding leaching mechanism. A controller controls the leaching time and pressure of the leaching mechanism corresponding to each layer of screen mechanism. The leaching time and pressure of the leaching mechanism located in the lower layer are greater than those of the leaching mechanism located in the upper layer. The scheme enables the internal leaching object to move circularly in the screen leaching chamber under the leaching impact force through the intermediate leaching head and the lower leaching head, ensures leaching of the sediment from various angles, improves the leaching completeness, and ensures the accuracy of heavy metal research.

[0004] Although the above scheme realizes the separation of sediment and gravel by means of the screen mechanism, the screen mesh is inclined, and the sediment falling on the screen mesh will gradually separate from the gravel under the action of the leaching mechanism. Finally, the gravel is discharged under the action of the leaching liquid. During this process, the gravel will still contact the sediment when rolling, or the sediment on the gravel will not be leached off when the gravel starts to roll and finally carries the sediment out, thereby reducing the treatment effect of heavy metals in the sediment. SUMMARY

[0005] The leaching device for heavy metal contaminated sediment with multiple sandstones solves the problem of poor leaching effect of heavy metals in the sediment when the existing sediment leaching device leaches the sediment.

[0006] To achieve the above purpose, the technical scheme adopted is as follows:

[0007] The utility model provides a kind of for multiple sandstone heavy metal pollution mud elution device, including elution mechanism and microbial agent adding device, the elution mechanism includes elution barrel, the top of the elution barrel is equipped with feed hopper, the bottom of the elution barrel is equipped with driving motor, the output shaft of the driving motor is connected with rotating shaft, the rotating shaft is equipped with gravel screen, coarse sand screen, fine sand screen and stirring shaft from top to bottom in sequence, the outer edge of the gravel screen, coarse sand screen and fine sand screen away from rotating shaft is connected with slip ring, the slip ring is slidably connected with elution barrel, three discharge outlets are further provided on the elution barrel, each discharge outlet is rotatably sealed with sealing door by pin shaft, torsion spring is connected between each pin shaft and discharge outlet, and three discharge outlets are respectively arranged near three slip rings;Three groups of spray assemblies are provided on the side wall of the elution barrel, and the three groups of spray assemblies are respectively arranged above the gravel screen, between the gravel screen and the coarse sand screen, and between the fine sand screen and the coarse sand screen, the three groups of spray assemblies are communicated with the lower side of the elution barrel through a circulating pipe, the circulating pipe is communicated with a water pump arranged below the fine sand screen, the lower side of the elution barrel is communicated with a discharge pipe located below the fine sand screen, the discharge pipe is provided with a valve, and the microbial agent adding device is communicated with the elution barrel.

[0008] Preferably, a funnel-shaped mud retaining bucket is arranged between the gravel screen and the coarse sand screen, and between the fine sand screen and the coarse sand screen.

[0009] Through the above arrangement, the mud to be eluted and screened can be collected in the middle of the elution barrel by the mud retaining bucket, avoiding the problem that the mud directly falls on the edge of the screening net during screening and cannot be screened by the centrifugal force generated by the screening net.

[0010] Preferably, a blowing mechanism is arranged in the elution barrel near the gravel screen, the coarse sand screen, and the fine sand screen.

[0011] Through the above arrangement, the blowing mechanism can prevent the mesh of the screening net from being blocked, and the stability of the screening of the mud is enhanced.

[0012] Preferably, the blowing mechanism includes negative pressure blades, blowing pipes, and an air induction pipe, a plurality of negative pressure blades are circumferentially equidistantly distributed on the rotating shaft, the negative pressure blades are located below the fine sand screen, a plurality of blowing pipes are respectively arranged on the inner wall of the elution barrel near the gravel screen, the coarse sand screen, and the fine sand screen, blowing holes are formed at the upper and lower ends of each blowing pipe, the lower end of the air induction pipe is located below the negative pressure blades and is communicated with the lower side of the elution barrel, and the air induction pipe is communicated with the corresponding blowing pipes.

[0013] Through the above setting, the rotating shaft drives the negative pressure blade to rotate, and after the negative pressure blade rotates, the air above can be sucked into the bottom of the rinsing barrel, and the negative pressure can also speed up the screening efficiency of the fine sand screening net. Meanwhile, the air sucked by the negative pressure blade enters each blowing pipe through the air guide pipe, and finally, the blowing holes are used for blowing operation on the screening net or the mud baffle, which is beneficial to improve the plugging condition of the screening net and the flow rate of the bottom mud on the mud baffle.

[0014] Preferably, L-shaped scrapers are arranged on the stirring shaft at intervals, and the scrapers are in abutment with the surfaces of the gravel screening net, the coarse sand screening net or the fine sand screening net and the inner wall of the rinsing barrel, respectively.

[0015] Through the above setting, the bottom mud on the inner wall of the rinsing barrel can be scraped off by the scrapers and the rinsing assembly, and the bottom mud on the screening net can be pushed through the screening net by the scrapers, so that the screening efficiency is improved.

[0016] Preferably, three sleeves are arranged on the rotating shaft at intervals and located in the middle parts of the gravel screening net, the coarse sand screening net or the fine sand screening net, a guide rod is arranged in each sleeve, and three movement paths in sliding connection with the corresponding guide rods are arranged on the rotating shaft at intervals, each movement path comprises a wave section and a straight section, and the straight section is located on one side of the discharge port.

[0017] Through the above setting, when the guide rod moves in the straight section, the bottom mud and the sandstone can be separated under the action of the centrifugal force generated by the rotation of the screening net, and the sandstone can be discharged through the sealing door under the action of the centrifugal force. When the guide rod is located in the wave section, the sleeve is driven to move along the movement path by the guide rod, so that the middle part of the corresponding screening net moves downward. At this time, the bottom mud and the sandstone accumulated at the edge of the screening net can slide to the position close to the middle part in the movement process of the screening net, and the screening efficiency is improved.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] The present application realizes the screening and rinsing of the bottom mud by the rinsing mechanism, and the accumulated bottom mud is spread by the centrifugal force generated in the screening process of each screening net, which helps to improve the screening and rinsing efficiency. The sandstone after screening and rinsing can be pushed by the sealing plate under the action of the centrifugal force, so that the sandstone is removed, and the continuous rinsing operation of the bottom mud is realized. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 It is a front view of a rinsing device for multi-sandstone heavy metal contaminated bottom mud of the present application;

[0021] Fig. 2 It is a sectional view of the sleeve in the present embodiment;

[0022] Fig. 3A sectional view of the injection pipe in the embodiment.

[0023] The names of the corresponding marks in the drawings are: microbial agent adding device 1, leaching barrel 2, supporting leg 3, feeding hopper 4, driving motor 5, rotating shaft 6, gravel screening net 7, coarse sand screening net 8, fine sand screening net 9, stirring shaft 10, sliding ring 11, mud baffle 12, scraper 13, sleeve 14, guide rod 15, movement path 16, sealing door 17, discharge pipe 18, spray head 19, liquid inlet pipe 20, circulating pipe 21, water pump 22, discharge pipe 23, feeding pipe 24, negative pressure blade 25, injection pipe 26, air duct 27, injection hole 28, connecting pipe 29. Embodiment

[0024] The application will be further described in detail below in combination with the drawings and embodiments: Embodiment

[0025] As Figs. 1 to 3 shown, a leaching device for multi-sandstone heavy metal contaminated sediment includes a leaching mechanism and a microbial agent adding device 1. The leaching mechanism includes a leaching barrel 2, and four supporting legs 3 are welded at the bottom of the leaching barrel 2. A feeding hopper 4 is communicated at the top center of the leaching barrel 2, and a driving motor 5 is bolted to the bottom of the leaching barrel 2 through a fixed plate, and a rotating shaft 6 is coaxially connected to the output shaft of the driving motor 5, and the rotating shaft 6 penetrates through the bottom of the leaching barrel 2 and is rotationally and sealingly connected to the bottom of the leaching barrel 2.

[0026] The rotating shaft 6 is sequentially provided with a gravel screening net 7, a coarse sand screening net 8, a fine sand screening net 9 and a stirring shaft 10 from top to bottom, and the gravel screening net 7, the coarse sand screening net 8 and the fine sand screening net 9 are all made of elastic material. The outer edges of the gravel screening net 7, the coarse sand screening net 8 and the fine sand screening net 9 away from the rotating shaft 6 are all connected with sliding rings 11, the sliding rings 11 are slidingly connected with the leaching barrel 2, and the leaching barrel 2 is provided with sliding grooves for the sliding rings 11 to slide. Funnel-shaped mud baffles 12 are arranged between the gravel screening net 7 and the coarse sand screening net 8 and between the fine sand screening net 9 and the coarse sand screening net 8, so that the mud falling from the gravel screening net 7 and the coarse sand screening net 8 can be collected to the middle part of the coarse sand screening net 8 or the fine sand screening net 9 by means of the mud baffles 12.

[0027] The rotating shaft 6 is further provided with three sleeves 14, which are located at the middle of the gravel screening net 7, the coarse sand screening net 8 and the fine sand screening net 9 respectively, and the bottoms of the three sleeves 14 abut against the gravel screening net 7, the coarse sand screening net 8 and the fine sand screening net 9 respectively. A guide rod 15 is adhered in each sleeve 14, and the rotating shaft 6 is provided with three movement paths 16 which are in sliding connection with the corresponding guide rods 15, each movement path 16 includes wave sections and straight sections with the same length, the height of the wave section is not more than that of the straight section, and the straight section is located on the side of the discharge port. An L-shaped scraper 13 is arranged on each sleeve 14, the bottom of the scraper 13 is provided with bristles which abut against the surface of the gravel screening net 7, the coarse sand screening net 8 or the fine sand screening net 9, and the short side of the scraper 13 is in sliding connection with the inner wall of the washing barrel 2.

[0028] The washing barrel 2 is further provided with three discharge ports, each discharge port is rotatably and sealingly connected with a sealing door 17 through a pin shaft, and a torsional spring is connected between each pin shaft and the discharge port, in the embodiment, since the three discharge ports need to remove different impurities, three torsional springs of different types are used, the torsional spring located at the uppermost side provides the largest torsion to the corresponding sealing door 17, and the torsional spring located at the lowermost side provides the smallest torsion to the corresponding sealing door 17. Each discharge port is communicated with a discharge pipe 18, the discharge pipe 18 is provided with a valve, and the three discharge ports are arranged near the three sliding rings 11.

[0029] The side wall of the washing barrel 2 is provided with three groups of spraying assemblies, the three groups of spraying assemblies are arranged above the gravel screening net 7, between the gravel screening net 7 and the coarse sand screening net 8, and between the fine sand screening net 9 and the coarse sand screening net 8 respectively, each group of spraying assemblies includes a plurality of spraying heads 19 and an annular liquid inlet pipe 20, all the spraying heads 19 in the same group of spraying assemblies are arranged on the liquid inlet pipe 20 at intervals, the three liquid inlet pipes 20 are communicated with the lower side of the washing barrel 2 through a circulating pipe 21, the circulating pipe 21 is communicated with a water pump 22 arranged below the fine sand screening net 9, and the water pump 22 is bolted in the washing barrel 2. The lower side of the washing barrel 2 is communicated with a discharge pipe 23 located below the fine sand screening net 9, the discharge pipe 23 is provided with a valve, the microbial agent feeder 1 is communicated with the washing barrel 2 through a feeding pipe 24, and the feeding pipe 24 is provided with a valve.

[0030] The elution barrel 2 is provided with a blowing mechanism close to the gravel screening net 7, the coarse sand screening net 8 and the fine sand screening net 9. The blowing mechanism comprises negative pressure blades 25, blowing pipes 26 and an air duct 27. The plurality of negative pressure blades 25 are distributed equidistantly in the circumferential direction on the rotating shaft 6, and the negative pressure blades 25 are located between the stirring shaft 10 and the fine sand screening net 9. The plurality of blowing pipes 26 are arranged on the inner wall of the elution barrel 2 close to the gravel screening net 7, the coarse sand screening net 8 and the fine sand screening net 9, and the blowing pipes 26 are located above the mud baffle 12 or the negative pressure blades 25. In the embodiment, the adjacent blowing pipes 26 of the gravel screening net 7, the coarse sand screening net 8 and the fine sand screening net 9 are only two, the two blowing pipes 26 are not located at the discharge port, and the two blowing pipes 26 are communicated through the arc-shaped connecting pipes 29. The upper and lower ends of each blowing pipe 26 are provided with inclined blowing holes 28, the blowing hole 28 located on the upper side is directed towards the rotating shaft 6, and the blowing direction of the blowing pipe 26 located on the lower side is directed towards the side wall of the mud baffle 12. The lower end of the air duct 27 is located below the negative pressure blades 25 and is communicated to the lower side of the elution barrel 2, and the air duct 27 is communicated with the three connecting pipes 29.

[0031] The working process of the scheme is as follows:

[0032] The microbial agent adding device 1 and the feeding pipe 24 are used to add microbial agents into the elution barrel 2, and then a certain amount of water is injected into the elution barrel 2. When the device starts to work, the motor is started first. After the motor is started, the rotating shaft 6 is driven to rotate, and then the microbial agents and water are uniformly mixed by the stirring shaft 10. After the motor is started for a period of time, the water pump 22 is started and the bottom mud is fed into the elution barrel 2 through the feeding hopper 4. The water pump 22 is started to draw the uniformly mixed microbial elution liquid into the circulating pipe 21, and then the microbial elution liquid is sprayed into the elution barrel 2 through the spray head 19 to elute the bottom mud.

[0033] When the bottom mud falls on the gravel screening net 7 through the feeding hopper 4, the rotating shaft 6 drives the gravel screening net 7, the sliding ring 11 and the scraper 13 to rotate together, and the bottom mud also rotates with the gravel screening net 7, so that the bottom mud is easily spread under the action of centrifugal force, which is beneficial to the leaching of the bottom mud on the surface of the gravel. When the guide rod 15 is in the straight section of the movement path 16, the gravel screening net 7 does not change, the microbial leaching liquid acts on the bottom mud to leach, and the bottom mud on the surface of the gravel is gradually leached and rolled under the action of centrifugal force, and finally is discharged through the impact sealing door 17. If the bottom mud is thrown onto the impact sealing door 17 during the rotation of the gravel screening net 7, the bottom mud will adhere to the impact sealing door 17 due to its own viscosity, and then be scraped away by the rotating scraper 13. When the guide rod 15 is in the wave section of the movement path 16, the guide rod 15 drives the sleeve 14 to move downward, so that the middle part of the gravel screening net 7 moves downward, which is beneficial to the sliding of the bottom mud on the edge of the gravel screening net 7 into the middle part, so as to realize the leaching and screening again and improve the leaching and screening efficiency. At the same time, the rotating scraper 13 drives the bristles to rotate, so that the bristles clean the bottom mud on the gravel screening net 7, which is beneficial to the passing of the bottom mud through the gravel screening net 7, and also can clean some bottom mud on the surface of the gravel; and the end of the scraper 13 in contact with the inner wall of the leaching barrel 2 can scrape the bottom mud on the inner wall of the leaching barrel 2. The leaching and screening processes of the bottom mud on the coarse sand screening net 8 and the fine sand screening net 9 are consistent with the working process of the gravel screening net 7.

[0034] During the rotation of the rotating shaft 6, the rotating shaft 6 also drives the negative pressure blade 25 to rotate, and the negative pressure blade 25 can suck air into the leaching barrel 2 after rotating, and send the air into the blowing pipe 26 through the air guide pipe 27, and finally blow out through the blowing hole 28 of the blowing pipe 26, so as to clean the mesh holes of the gravel screening net 7, the coarse sand screening net 8 and the fine sand screening net 9 by using the blown air, which effectively avoids the problem that the mesh holes of the screening nets are blocked by the bottom mud during the screening process, and maintains the screening efficiency. At the same time, the bottom mud falling from the mud blocking hopper 12 can be blown into the lower screening net, which improves the leaching and screening efficiency. During the working process of the negative pressure blade 25, the directional flow of the air also improves the passing rate of the bottom mud on the screening net, the coarse sand screening net 8 and the fine sand screening net 9.

[0035] The above is only an embodiment of the present application, and the common knowledge of specific structures and / or characteristics in the scheme is not described in detail. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be regarded as the protection scope of the present application, and these will not affect the effect and practicality of the patent. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A leaching device for multi-silt heavy metal contaminated sediment, comprising a leaching mechanism and a microbial agent adding device, characterized in that: The elution mechanism comprises an elution barrel, the top of the elution barrel is provided with a feeding hopper, the bottom of the elution barrel is provided with a driving motor, the output shaft of the driving motor is connected with a rotating shaft, the rotating shaft is sequentially provided with a gravel screening net, a coarse sand screening net, a fine sand screening net and an agitating shaft from top to bottom, the outer edges of the gravel screening net, the coarse sand screening net and the fine sand screening net away from the rotating shaft are all connected with sliding rings, the sliding rings are in sliding connection with the elution barrel, three discharge ports are formed in the elution barrel, each discharge port is rotatably and sealingly connected with a sealing door through a pin shaft, a torsional spring is connected between each pin shaft and the discharge port, and the three discharge ports are arranged near the three sliding rings.

2. A device for leaching of heavy metal contaminated sediment with high sand content as claimed in claim 1, wherein: The gravel screening net, the coarse sand screening net and the fine sand screening net are all provided with funnel-shaped mud blocking hoppers.

3. A device for leaching of heavy metal contaminated sediment with high sand content according to claim 1 or 2, characterized in that: The elution barrel is provided with a blowing mechanism near the gravel screening net, the coarse sand screening net and the fine sand screening net.

4. A device for leaching of heavy metal contaminated sediment with high sand content as claimed in claim 3, wherein: The blowing mechanism comprises negative pressure blades, blowing pipes and an air induction pipe, a plurality of negative pressure blades are circumferentially and equidistantly distributed on the rotating shaft, the negative pressure blades are located below the fine sand screening net, a plurality of blowing pipes are arranged on the inner wall of the elution barrel near the gravel screening net, the coarse sand screening net and the fine sand screening net, blowing holes are formed in the upper and lower ends of each blowing pipe, the lower end of the air induction pipe is located below the negative pressure blades and is in communication with the lower side of the elution barrel, and the air induction pipe is in communication with the corresponding blowing pipes.

5. A device for leaching of heavy metal contaminated sediment with high sand content as claimed in claim 1, wherein: The agitating shaft is provided with L-shaped scrapers at intervals, and the scrapers are in abutment with the surfaces of the gravel screening net, the coarse sand screening net and the fine sand screening net and the inner wall of the elution barrel.

6. A device for leaching of a sand and gravel contaminated with heavy metals according to claim 4 or 5, characterized in that: The rotating shaft is provided with three sleeves located in the middle portions of the gravel screening net, the coarse sand screening net and the fine sand screening net, each sleeve is provided with a guide rod, the rotating shaft is provided with three movement paths in sliding connection with the corresponding guide rods, each movement path comprises a wave section and a straight section, and the straight section is located on the side of the discharge port.

Images