CN107555739A - The bed mud elution screening system and its elution method for sieving of a kind of interlocked control - Google Patents
The bed mud elution screening system and its elution method for sieving of a kind of interlocked control Download PDFInfo
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- CN107555739A CN107555739A CN201710709457.3A CN201710709457A CN107555739A CN 107555739 A CN107555739 A CN 107555739A CN 201710709457 A CN201710709457 A CN 201710709457A CN 107555739 A CN107555739 A CN 107555739A
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- 238000010828 elution Methods 0.000 title claims abstract description 174
- 238000012216 screening Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000007873 sieving Methods 0.000 title claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 84
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000006243 chemical reaction Methods 0.000 claims abstract description 36
- 239000007921 spray Substances 0.000 claims abstract description 28
- 238000002386 leaching Methods 0.000 claims abstract description 22
- 238000000926 separation method Methods 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 39
- 229910001385 heavy metal Inorganic materials 0.000 claims description 37
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Abstract
The bed mud elution screening system and its elution method for sieving of a kind of interlocked control.The system includes elution device, screening plant and frequency conversion spray pipeline；Elution device includes elution roller, material pick-up device and speed-adjustable driving device, and elution roller is connected with speed-adjustable driving device, and material pick-up device is arranged in elution roller；Screening plant is connected to the port of export of elution roller；Frequency conversion spray pipeline is arranged in elution device.Elution method for sieving includes：（1）Bed mud breaks up feed；（2）Bed mud elutes；（3）Screening；（4）Elute roller to reversely rotate, extend the material stirring elution time；（5）Start chemical leaching, chemical leaching is carried out by frequency conversion spray pipeline, or chemical leaching elutes alternately with clear water.The present invention realizes accurate elution, saves energy consumption, effectively avoids sieve pore blockade, improve elution efficiency；Realize different-grain diameter, different content of beary metal bed mud component elution separation, reach bed mud classification processing purpose.
Description
Technical field
It is used to be administered and repaiied by the bed mud of the pollutions such as heavy metal, nutrient, hardly degraded organic substance the present invention relates to a kind of
Multiple elution circuit, belong to elution technique field.
Background technology
Countries in the world are different to the control and plan and Treatment process scheme of Heavy Metal Pollution in Sediments at present, especially exist
The factor such as China, contaminated and Economy Contrast influences, and does not possess the bar for carrying out Heavy Metal Pollution in Sediments control comprehensively still
Part.It is different according to the pollution level of polluted water body, with reference to the implementation condition of contaminated site, currently used heavy metal pollution bottom
The recovery technique of mud is broadly divided into in-situ treatment technology and dystopy treatment technology.
Treatment process in situ mainly includes phytoremediation in situ and in-situ materials soverlay technique, its situ phytoremediation with
Its cost is low, it is simple to operate, be not likely to produce the advantages such as secondary pollution and receive much concern, but it is low to still suffer from treatment effeciency, plant species
The defects of plant is easily influenceed by local climate, river course flood situation.In-situ materials soverlay technique is that passivation material is covered on bed mud surface
Material, release approach of the heavy metal into water body is blocked, by the physicochemical property of covering material and the water conservancy hydrological characteristics of natural water
Have a great influence, and there is no reliable covering material dispensing device at present, realize that uniform no leak source covering difficulty is larger.
When therefore, for heavy contamination water body or larger difficulty of governance in situ, frequently with dystopy Treatment process.
Sediment Dredging is the primary link of heavy metal polluted bed mud dystopy Treatment process, refer to by it is defined dredging scope and
Dredging depth, mode manually or mechanically is taken by by heavy metal or the bed mud of other pollutions (including mud, sand, stone and other miscellaneous
Thing) etc. the engineering that clears out and be acted upon from the system of waters, Dredging Process avoid secondary pollution.
The Sediment Dredging of ephemeral stream is mainly using the method for engineering dredging at present.Engineering dredging technology is commonly divided into
Dry method engineering is dredged and the dredging of wet method engineering, wherein, the dredging of dry method engineering has the characteristics of low mud extraction moisture content, small volume, but
The bed mud that improvement basin can be made to contain heavy metal in its operating process is exposed in air for a long time, easily to surrounding enviroment and behaviour
Make personnel and produce harm；The dredging of wet method engineering can preferably control the secondary pollution problem to environment, but its dredger twists
The design form of knife, determine that it can produce larger disturbance to water body in operation, so that the pollutant in bed mud
Matter is migrated into overlying water, and adverse effect can be brought to dredged region water body.Engineering dredging is commonly used as current water conservancy industry
Dredging method, technology and equipment are more ripe, and dry method engineering dredging therein has stronger adaptability to ephemeral stream.
After the dredging of above-mentioned ephemeral stream engineering, particularly dry method Dredged bed mud is characterized in that moisture content is relatively low, cobble, broken
(particle diameter ＞ 4.75mm component, definition come from stone《Building sand》, similarly hereinafter) and sand (0.075mm ＜ grains (GB14684-2011)
Footpath ＜ 4.75mm) etc. bulky grain bed mud component adhered to each other with little particle bed mud components such as mud (particle diameter ＜ 0.075mm), formed glutinous
Block, it is not readily separated, it is contemplated that the Size Distribution of the pollutant such as heavy metal of bed mud after dredging, i.e., generally, 90%
Pollutant primary attachment above (different zones, different bed mud types, above-mentioned suction on mud particle of the particle diameter less than 0.075mm
Attached particle size range is slightly different), cause cobble, rubble and sand etc. because having adhered to a certain amount of little particle, also containing a certain amount of
Pollutant, it is necessary to cut down or removed.
Disclosed in Chinese patent literature CN101921090A《Multi-stage self controlling screening heavy metal polluted bed mud dystopy administers system
System》, mainly including regulating reservoir, the first conditioner, the second conditioner, the 3rd conditioner and the 3rd conditioner；On first conditioner
Portion is provided with vibratory sieve, and conveying slag stock pump is connected between regulating reservoir and vibratory sieve；Three layers are provided with vibratory sieve from top to bottom
Screen cloth, every layer of screen cloth are connected with a set of belt conveyor respectively；The top of second conditioner is provided with screw sand washer, spiral washed-out sand
Machine is connected with the 4th set of belt conveyor, and the top of the 3rd conditioner and the 3rd conditioner is equipped with hydrocyclone, two water
Power cyclone is respectively connected with a set of belt conveyor, and mixer, Pulp pump and particle size analyzer are provided with three conditioners.
Although the system has taken into full account the technology enforcement difficulty of the larger heavy metal polluted bed mud containing sand fraction, with reference to the reason of bed mud
Change characteristic, the Size Distribution and recycling approach of Heavy Metal Pollution in Sediments thing, be classified screening, but it is inabundant
Consider the hydrologic condition of ephemeral stream and ephemeral stream engineering Dredged bed mud moisture content is low, gravel content is big, particularly big,
Small particle adheres to each other, and sticks the characteristics of block is more.
Disclosed in CN101921090A《Ephemeral stream heavy metal polluted bed mud is dredged and dystopy administering method and system》,
Although it is contemplated that the characteristics of ephemeral stream engineering Dredged bed mud moisture content is low, gravel content is big, there is provided roller-type stone washing machine and
Screw sand washer, but it is to its concrete structure and unclear with describing, refer only to the cobble (particle diameter ＞ 4.75mm) that ought wherein contain
When content is more when (mass fraction is more than 10%), roller-type stone washing machine is transported to by closing bed mud transport vehicle, is drenched using river
Wash and elution processing is carried out to bed mud with the method for chemical leaching, but not to the structure of roller-type stone washing machine and screw sand washer, function
It is designed with operating method, when being eluted using river, elution intensity is confined to the elution ability of equipment in itself, when river elutes
When can not meet to require, directly using chemical leaching, the financial burden to leacheate processing is added, while also increase elution
Liquid pollutes the possibility for closing on river.
Therefore, urgently it is directed to low ephemeral stream bed mud moisture content, cobble, stone contents height and the large and small particulate matter of bed mud
Adhere to each other, the characteristics of block is more are sticked, with reference to the Size Distribution of sediment pollution, for the cobble in ephemeral stream bed mud
(particle diameter ＞ 4.75mm) and medium coarse sand (1mm ＜ particle diameter ＜ 4.75mm), develop suitable special elution circuit, to different-grain diameter and
The bed mud of different pollutant loads is eluted and screening process, and while mitigating subsequent treatment disposal pressure, screening can be achieved
The recycling of different-grain diameter bed mud afterwards.
The content of the invention
The present invention is low for current ephemeral stream bed mud moisture content, cobble stone contents height and bed mud size particles thing
Adhere to each other, stick the characteristics of block is more, with reference to the Size Distribution of sediment pollution, there is provided one kind automatically controls conversion operation side
Formula, accurate elution and screening, efficiency high, the bed mud elution screening system of the good interlocked control of effect, while a kind of this is provided and is
The elution method for sieving of system.
The bed mud elution screening system of the interlocked control of the present invention, using following technical scheme：
The system, including elution device, screening plant and frequency conversion spray pipeline；Elution device includes elution roller, material
Pick-up device and speed-adjustable driving device, elution roller are connected with speed-adjustable driving device, and material pick-up device is arranged on elution roller
In；Screening plant is connected to the port of export of elution roller；Frequency conversion spray pipeline is arranged in elution device.
The elution device is connected with breaing up batcher by conveyer of weighing and (breaks up batcher, weigh conveyer and leaching
Washing and sieving separating device is sequentially connected).Batcher is broken up to be used to break up bed mud and be advanced into conveyer of weighing；Conveyer of weighing is used for
The relatively low bed mud of breaing up of moisture content is weighed and is delivered to elution screening plant.
Import heavy metal on-line computing model, the bed mud that detection enters in elution roller are provided with the elution drum inlet
Middle pollutant load.
The speed-adjustable driving device includes frequency control motor and transmission mechanism, frequency control motor and transmission mechanism it is defeated
Enter end connection, the output end of transmission mechanism is connected with elution roller.Speed-adjustable driving device can realize that elution roller rotates forward and anti-
Turn, and speed can be adjusted to low speed, middling speed and high speed.
The material pick-up device, including along the axially arranged transducing unit of elution roller, often arranging transducing unit includes becoming
Plate, rotating shaft, pull bar and push-pull mechanism are sent, pick-up plate is often saved and is connected by rotating shaft with pull bar, rotating shaft is connected to elution roller
In side wall, pull bar is connected with push-pull mechanism.Push-pull mechanism drives pull bar axial movement, and pull bar drives axis of rotation again,
The rotation of rotating shaft changes again often saves the angle of inclination of pick-up plate to axial；When the pick-up plate on all single transducing units is homogeneous
When axially inclined to elution roller, all pick-up plates are formed helical arrangement, and when elution roller rotates, material will be by spiral
The pick-up plate of arrangement promotes forward or backward；When the pick-up plate on all single transducing units is each parallel to elution roller axial direction
When, when elution roller rotates, material would not be pushed, to increase elution time of the material in elution roller.
The screening plant, including classification screen barrel, screen barrels at different levels are sequentially connected, and every grade of screen barrel has a screen cloth
Aperture, can according to be actually needed successively realize elution after different-grain diameter material screening separate.The bottom of the screen barrel is set
Receiving hopper is equipped with, conveyer is provided with below receiving hopper.Discharging heavy metal on-line computing model is connected with the receiving hopper, with reality
When detect pollutant load in outsiftings at different levels.
The frequency conversion spray pipeline, including frequency conversion high-pressure hydraulic pump, feed flow supervisor, feed flow branch pipe and shower nozzle, frequency conversion water under high pressure
Pump is connected with feed flow supervisor, and feed flow branch pipe is connected with feed flow supervisor, and feed flow branch pipe is distributed in elution roller and (do not rolled with elution
Cylinder connection), shower nozzle is distributed with feed flow branch pipe.Frequency conversion spray pipeline can realize multi-angle and different pressures water spray.The confession
Liquid branch pipe can be axial arranged along elution inner wall of rotary drum, is sprayed with realizing in barrel lenght direction and radially to the multi-angle of material
Leaching.
The method that said system carries out eluting screening to bed mud, comprises the following steps：
(1) bed mud breaks up feed：
Broken (breaing up the clay block or the combination of clay and sandstone in bed mud) is broken up to the bed mud after dredging, after breaing up
Bed mud be delivered to elution roller in；
(2) bed mud elutes：
By eluting the import heavy metal on-line computing model at drum inlet, detection enters dirty in the bed mud in elution roller
Thing content is contaminated, determines sediment pollution degree, according to slight pollution, intermediate pollution and serious pollution, controls speed governing driving dress respectively
Putting makes the rotating speed of elution roller be low speed, middling speed and rotate at a high speed, and carries out in the following manner：
1. such as sediment pollution degree is defined as slight pollution, then the rotating speed for eluting roller is transferred into low or first gear is carried out to bed mud
Clear water elution separation, it is low pressure, medium and high pressure to be controlled elution water pressure by frequency conversion spray pipeline；
2. such as sediment pollution degree is defined as intermediate pollution, then the rotating speed for eluting roller is transferred into mid ranger is carried out to bed mud
Clear water elution separation, it is low pressure, medium and high pressure to be controlled elution water pressure by frequency conversion spray pipeline；
3. such as sediment pollution degree is defined as serious pollution, then the rotating speed for eluting roller is transferred into top gear is carried out to bed mud
Clear water elution separation, it is low pressure, medium and high pressure to be controlled elution water pressure by frequency conversion spray pipeline；
By adjusting material pick-up device, residence time of the control bed mud in elution roller；
(3) sieve：
Control material pick-up device, the material after scrubbed roller elution is set to be promoted to screening plant, different-grain diameter
The receiving hopper that material is fallen into below corresponding screen barrel, by the dirt of the discharging heavy metal on-line computing model of the receiving hopper particle diameter material
Dye degree, if a kind of particle diameter material is not reaching to sets requirement, makes material stop promoting with regard to control material pick-up device, make bottom
Mud continues to elute in elution roller, and the rotating speed for eluting roller is transferred into middle speed gear by low or first gear or is transferred at a high speed by mid ranger
Gear, middle pressure is risen to by low pressure with water pressure by the elution of frequency conversion spray pipeline or high pressure is risen to by low pressure；Until screen barrel sieves
The every kind of particle diameter material gone out all reaches sets requirement (when meeting relevant standard requirement)；
(4) if above step can not ensure that the pollution level of every kind of particle diameter material after separation all reaches requirement,
Control speed-adjustable driving device reversely rotates elution roller, and then control material pick-up device makes material not be pushed into, and is only drenching
Wash in roller and overturn, extend stirring of the material in elution roller and elute the time, the control of elution water pressure be low pressure, middle pressure or
High pressure；Until the every kind of particle diameter material screened out all reaches requirement；
(5) if above step can not ensure that the pollution level of every kind of particle diameter material after separation all reaches requirement,
Start chemical leaching, chemical leaching is carried out by frequency conversion spray pipeline, or chemical leaching elutes alternately with clear water, until
The every kind of particle diameter material screened out all reaches requirement.
The low rotation speed is 10~15r/min, middling speed rotating speed is 15~20r/min and high speed rotating speed is 20~25r/
min。
The low pressure of the hydraulic pressure is 0.25~0.5MPa, and middle pressure is 0.5~0.75MPa, and high pressure is 0.75~1.0MPa.
The slight pollution, intermediate pollution and the division of serious pollution according to the form below, as long as there is containing for a heavy metal species in bed mud
Amount just belongs to the pollution level in the content range of corresponding pollution level：
Heavy Metal Pollution in Sediments degree divides table
The present invention is directed to low current ephemeral stream bed mud moisture content, cobble, stone contents height and the large and small particulate matter of bed mud
Adhere to each other, stick block it is more the characteristics of, with reference to heavy metal pollution Size Distribution and recycling approach (refer mainly to according to
GB14684-2011 and GB14685-2011 classificating requirement and JGJ52-2006 and JGJ55-2011 building materials sand and ovum
Stone step matches somebody with somebody requirement), for the cobble (particle diameter ＞ 4.75mm) and medium coarse sand (1mm ＜ particle diameters ＜ in ephemeral stream bed mud
4.75mm), the functionality advantage of different drum-type elution circuits is given full play to, emphasis leaching sieve is carried out to the said components in bed mud
Point, while automatic control requirement is taken into full account, and it is simple to operate, it is convenient to carry out, have the characteristics that：
1. taking into full account that ephemeral stream bed mud moisture content is low and the large and small particulate matter of bed mud adheres to each other, the spy more than block is sticked
Point, the sediment pollution degree shown according to heavy metal online monitoring data automatically control the conversion equipment method of operation, and control is different
Rolling stirring intensity, spraying intensity and elution time, realize accurate elution, save energy consumption and effectively avoid in screening process
While the problems such as sieve pore blockade that may occur, elution efficiency is improved；By converting adjustable mesh size sum amount, realize
Different-grain diameter, different content of beary metal bed mud component elution separation, reach the purpose of bed mud classification processing.
2. can be with the direction of rotation of flexible modulation roller and rotary speed, and then adjust and roll stirring intensity, reach control
Elute the purpose of effect；
3. can be with the spray direction of flexible modulation shower nozzle and spray-water pressure, and then elution intensity is adjusted, reach control
Elute the purpose of effect；
4. can be with the inclination angle of material pick-up device in flexible modulation roller, and then realize and improve elution time, Non-leaching
Effect；
5. can be with flexible modulation mesh size and quantity, and then realize the screening purpose of different-grain diameter bed mud component；
6. it can flexibly switch clear water elution and chemical leaching according to the pollution type and pollution level of bed mud, at utmost
The upper pollution for reducing chemical leaching to environment.
7. by being used in combination for online detection instrument and control system, automatically controlling for elution screening process is realized,
Contribute to real-time tracking treatment effect, improve screening efficiency and treatment effeciency.
8. fully combine Heavy Metal Pollution in Sediments particle Size Distribution, by subsequent treatment dispose object lock compared with
In small scope (being usually below 1mm), effectively solves current Heavy Metal Pollution in Sediments control specific aim deficiency
Problem, greatly alleviate subsequent treatment disposal difficulty and disposal pressure.
Brief description of the drawings
Fig. 1 is the principle schematic diagram of the bed mud elution screening system of interlocked control of the present invention.
Fig. 2 is the structural representation of material pick-up device in the present invention.
Fig. 3 is the material advanced state schematic diagram of material pick-up device.
In figure：1. batcher is broken up, 2. conveyers, 3. elution rollers, 4. feed flow branch pipes, 5. shower nozzles, 6. feed flows supervisor, 7.
Frequency conversion high-pressure hydraulic pump, 8. transducing units, 9. frequency control motors, 10. transmission devices, 11. screen barrels, 12. spacer rings, 13. dischargings
Heavy metal on-line computing model, 14. receiving hoppers, 15. discharging output machines, 16. import heavy metal on-line computing models, 17. pull bars,
18. rotating shaft, 19. pick-up plates.
Embodiment
As described in Figure 1, the bed mud elution screening system of interlocked control of the invention, including break up batcher 1, conveying of weighing
Machine 2, elution device, screening plant and frequency conversion spray pipeline.Break up batcher 1, the elution in weigh conveyer 2 and elution device
Roller 3 is sequentially connected.Break up batcher 1 and conveyer 2 of weighing uses existing equipment.Batcher 1 is broken up to be used to break up bed mud
And it is advanced into conveyer 2 of weighing.Conveyer 2 of weighing is used to weighing and being delivered to elution roller the relatively low bed mud of breaing up of moisture content
3.Conveyer 2 of weighing can be conveying worm or belt conveyor.Screening plant is connected to the port of export of elution device.Frequency conversion
Spray pipeline is laid in the elution roller 3 of elution screening plant.
Elution device includes elution roller 3, speed-adjustable driving device and material pick-up device.In the entrance point of elution roller 3
Import heavy metal on-line computing model 16 is set, to detect the pollution level for entering material in elution roller 3.Roller 3 is eluted with adjusting
Fast drive device connection；Speed-adjustable driving device includes frequency control motor 9 and transmission device 10, frequency control motor 9 and transmission
The input of device 10 is directly connected to or connected by decelerator, and the output end of transmission device 10 is connected with elution roller 3.Transmission
Device 10 can use gear drive, and driving gear is directly installed on frequency control motor 9 or on decelerator, passively
Gear is arranged on elution roller 3.Speed-adjustable driving device can realize that elution roller rotates and reverse, and speed can be adjusted to low speed
(10~15r/min), middling speed (15~20r/min) and high speed (20~25r/min).Material pick-up is provided with elution roller 3
Device, include axially arranged multiple rows of transducing unit 8 along elution roller 3 as shown in Figure 2 and referring to Fig. 1, material pick-up device,
Often row's transducing unit 8 includes pick-up plate 19, rotating shaft 18, pull bar 17 and push-pull mechanism (being not drawn into figure), leads on pull bar 17
Cross and more piece pick-up plate 19 is distributed with, often save pick-up plate 19 and be connected by rotating shaft 18 with pull bar 17, rotating shaft 18 is connected to elution rolling
In the side wall of cylinder 3, pull bar 17 is connected with push-pull mechanism.Push-pull mechanism drives pull bar 17 to move axially, the band again of pull bar 17
Turn axle 18 rotates, and the rotation of rotating shaft 18 changes again often saves 17 angle of inclination to axial of pick-up plate.Referring to Fig. 3, when all
When the relative elution roller 3 of pick-up plate 17 on each row's transducing unit 8 is axially inclined, then all pick-up plates 17 are formed spiral shell
Rotation arrangement, when elution roller 3 rotates, material will be promoted forward or backward by the pick-up plate 17 of helical arrangement.As all rows
Pick-up plate 17 on transducing unit 8 each parallel to elution roller 3 axially (being horizontal) when, when elution roller 3 rotates, material
It would not be pushed, can so increase elution time of the material in elution roller 3.
Screening plant is connected to the port of export of elution roller 3, including classification screen barrel 11, screen barrels 11 at different levels connect successively
Connect, screen barrel 11 surrounds tubular by screen cloth, and the screen cloth of every grade of screen barrel 11 has an aperture, can be according to being actually needed successively
Realize the screening separation of different-grain diameter material after eluting.The mesh size of screen barrels at different levels is outside successively from small to large to be arranged, can
It is actually needed with basis and realizes that material separates from small particle to the screening of big particle diameter after elution in roller successively.Every grade of screen barrel 11
Bottom be provided with receiving hopper 14, the lower section of receiving hopper 14 is provided with discharging output machine 15.Discharging is connected with receiving hopper 14
Heavy metal on-line computing model 13, to detect the pollutant load in outsiftings at different levels in real time.Outsifting is defeated through the output machine 15 that discharges
Specified place is delivered to, carries out subsequent treatment.In order to which the material for preventing upper level screen barrel from falling enters next stage, in adjacent screen mesh
Spacer ring 12 is set between cylinder 11.
Frequency conversion spray pipeline, as shown in figure 1,6, feed flow branch pipe 4 and shower nozzle 5 are responsible for including frequency conversion high-pressure hydraulic pump 7, feed flow,
Frequency conversion high-pressure hydraulic pump 7 is connected with feed flow supervisor 6, and feed flow branch pipe 4 is connected with feed flow supervisor 6, and feed flow branch pipe 4 is distributed in elution rolling
(it is not connected in cylinder 3 with elution roller 3), feed flow branch pipe 4 can be axial arranged along the inwall of elution roller 3, is grown with realizing in cylinder
Spend direction and radially the multi-angle of material is sprayed.Shower nozzle 5 is distributed with feed flow branch pipe 4.Shower nozzle 5 can use rotary nozzle.
Frequency conversion spray pipeline can realize multi-angle and different pressures water spray, reach preferably elution purpose.
The method that said system carries out eluting screening to bed mud, comprises the following steps：
(1) bed mud breaks up feed：
Bed mud after dredging is delivered to break up batcher 1 carry out it is broken break up, break up clay block in bed mud or clay with
The combination of sandstone, the bed mud after breaing up, which drops down onto, weighs on conveyer 2, is delivered to after weighing in elution roller 3.
(2) bed mud elutes：
Import heavy metal on-line computing model 16 by eluting the porch of roller 3, which detects, to be entered in elution roller 3 in bed mud
Pollutant load, sediment pollution degree is determined, according to the form below is divided into slight pollution, intermediate pollution and serious pollution, as long as in bed mud
As soon as having the content of heavy metal species in the content range of corresponding pollution level, belong to the pollution level：
Heavy Metal Pollution in Sediments degree divides table
According to slight pollution, intermediate pollution and serious pollution, correspondingly control speed-adjustable driving device makes elution roller 3 respectively
Rotating speed be low speed, middling speed and rotate at a high speed, and carry out in the following manner：
1. sediment pollution degree is defined as slight pollution, then the rotating speed for eluting roller 3 is transferred into low or first gear is carried out to bed mud
Clear water elution separation, it is low pressure (0.25~0.5MPa), middle pressure (0.5 to be controlled elution water pressure by frequency conversion high-pressure hydraulic pump 7
~0.75MPa) and high pressure (0.75~1.0MPa).
2. such as sediment pollution degree is defined as intermediate pollution, then the rotating speed for eluting roller 3 is transferred to mid ranger and bed mud is entered
The elution separation of row clear water, is low pressure, medium and high pressure by the control of elution water pressure；
3. such as sediment pollution degree is defined as serious pollution, then the rotating speed for eluting roller 3 is transferred to top gear and bed mud is entered
The elution separation of row clear water, the control of elution water pressure is low pressure, medium and high pressure.
Material pick-up device is adjusted, each pick-up plate 17 is in horizontality, material only rolls in elution roller 3,
It will not be pushed, thus can adjust residence time of the bed mud in elution roller 3.
(3) sieve：
After bed mud reaches the elution time of setting in elution roller 3, control material pick-up device, make every section pick-up plate
17 inclination certain angle to axial, all pick-up plates 17 are made to form helical arrangement.With the rotation of elution roller 3, material
Screen barrel 11 is pushed to, the material of different-grain diameter falls into the receiving hopper 14 of the lower section of respective aperture screen barrel 11, by receiving hopper 14
Discharging heavy metal on-line computing model 13 detect the pollution level of the particle diameter material, if by a kind of pollution level of particle diameter material
Requirement is not reaching to, horizontality is in regard to each pick-up plate 17 in control material pick-up device, makes material stop promoting, after
Continue and eluted in elution roller, the rotating speed for eluting roller 3 is transferred to middle speed gear by low or first gear or top gear is transferred to by mid ranger, lead to
Frequency conversion spray pipeline is crossed elution is risen into middle pressure by low pressure with water pressure or rises to high pressure by low pressure；Until each screen barrel 11 sieves
The every kind of particle diameter material gone out all reach requirement (when meeting the requirement of relevant standard, as the cobble after separating and medium coarse sand (Li Jing≤
2.36mm part) meet relevant standards and norms GB14685-2011, JGJ52-2006 and JGJ55-2011)；
(4) if above step can not ensure that the pollution level of every kind of particle diameter material after separation all reaches requirement,
Control frequency control motor 9 reversely rotates elution roller 3, and then each pick-up plate 17 in control material pick-up device is in
Horizontality, make material stop promoting, only overturn elution in elution roller, extend stirring leaching of the material in elution roller 3
Wash the time, the control of elution water pressure is low pressure, medium-pressure or high pressure；Until every kind of particle diameter material that each screen barrel 11 screens out is all
Reach requirement；
(5) if above step can not ensure that the pollution level of every kind of particle diameter material after separation all reaches requirement,
Start chemical leaching, chemical leaching is carried out by frequency conversion spray pipeline, or chemical leaching elutes alternately with clear water, until
The every kind of particle diameter material screened out all reaches requirement.The species and dosage of chemical leaching can determine as needed.
Claims (10)
1. a kind of bed mud elution screening system of interlocked control, it is characterized in that, including elution device, screening plant and frequency conversion spray
Pipeline；Elution device includes elution roller, material pick-up device and speed-adjustable driving device, and elution roller connects with speed-adjustable driving device
Connect, material pick-up device is arranged in elution roller；Screening plant is connected to the port of export of elution roller；Frequency conversion spray pipeline is set
It is placed in elution device.
2. the bed mud elution screening system of interlocked control according to claim 1, it is characterized in that, the elution drum inlet
Place is provided with import heavy metal on-line computing model, and detection enters pollutant load in the bed mud in elution roller.
3. the bed mud elution screening system of interlocked control according to claim 1, it is characterized in that, the speed-adjustable driving device
Including frequency control motor and transmission mechanism, the input connection of frequency control motor and transmission mechanism, the output of transmission mechanism
End is connected with elution roller.
4. the bed mud elution screening system of interlocked control according to claim 1, it is characterized in that, the material pick-up dress
Put, including along the axially arranged transducing unit of elution roller, often arranging transducing unit includes pick-up plate, rotating shaft, pull bar and push-and-pull
Mechanism, often save pick-up plate and be connected by rotating shaft with pull bar, rotating shaft is connected on elution cylinder wall, pull bar and push-pull mechanism
Connection.
5. the bed mud elution screening system of interlocked control according to claim 1, it is characterized in that, the screening plant, bag
Classification screen barrel is included, screen barrels at different levels are sequentially connected, and every grade of screen barrel has a mesh size.
6. the bed mud elution screening system of interlocked control according to claim 5, it is characterized in that, the bottom of the screen barrel
Receiving hopper is provided with, discharging heavy metal on-line computing model is connected with the receiving hopper.
7. the bed mud elution screening system of interlocked control according to claim 1, it is characterized in that, the frequency conversion shower
Road, including frequency conversion high-pressure hydraulic pump, feed flow supervisor, feed flow branch pipe and shower nozzle, frequency conversion high-pressure hydraulic pump connect with feed flow supervisor, feed flow master
Feed flow branch pipe is connected with pipe, feed flow branch pipe is distributed in elution roller, and shower nozzle is distributed with feed flow branch pipe.
8. a kind of elution method for sieving of the bed mud elution screening system of the interlocked control described in claim 1, it is characterized in that, bag
Include following steps：
(1) bed mud breaks up feed：
Bed mud after dredging is broken up it is broken, the bed mud after breaing up be delivered to elution roller in；
(2) bed mud elutes：
By eluting the import heavy metal on-line computing model at drum inlet, detection enters pollutant in the bed mud in elution roller
Content, sediment pollution degree is determined, according to slight pollution, intermediate pollution and serious pollution, control speed-adjustable driving device to make respectively
The rotating speed for eluting roller is low speed, middling speed and high speed rotate, and carried out in the following manner：
1. such as sediment pollution degree is defined as slight pollution, then the rotating speed for eluting roller is transferred into low or first gear carries out clear water to bed mud
Elution separation, it is low pressure, medium and high pressure to be controlled elution water pressure by frequency conversion spray pipeline；
2. such as sediment pollution degree is defined as intermediate pollution, then the rotating speed for eluting roller is transferred into mid ranger carries out clear water to bed mud
Elution separation, it is low pressure, medium and high pressure to be controlled elution water pressure by frequency conversion spray pipeline；
3. such as sediment pollution degree is defined as serious pollution, then the rotating speed for eluting roller is transferred into top gear carries out clear water to bed mud
Elution separation, it is low pressure, medium and high pressure to be controlled elution water pressure by frequency conversion spray pipeline；
By adjusting material pick-up device, residence time of the control bed mud in elution roller；
(3) sieve：
Control material pick-up device, the material after scrubbed roller elution is set to be promoted to screening plant, the material of different-grain diameter
The receiving hopper fallen into below corresponding screen barrel, by the pollution journey of the discharging heavy metal on-line computing model of the receiving hopper particle diameter material
Degree, if a kind of particle diameter material is not reaching to sets requirement, with regard to control material pick-up device make material stop promote, make bed mud after
Continue and eluted in elution roller, the rotating speed for eluting roller is transferred to middle speed gear by low or first gear or top gear is transferred to by mid ranger, lead to
The elution of frequency conversion spray pipeline is crossed to rise to middle pressure by low pressure with water pressure or rise to high pressure by low pressure；Until screen barrel screen out it is every
Kind particle diameter material all reaches sets requirement；
(4) if above step can not ensure that the pollution level of every kind of particle diameter material after separation all reaches requirement, control
Speed-adjustable driving device reversely rotates elution roller, and then control material pick-up device makes material not be pushed into, and is only rolled in elution
Overturn in cylinder, extend stirring of the material in elution roller and elute the time, the control of elution water pressure is low pressure, middle pressure or height
Pressure；Until the every kind of particle diameter material screened out all reaches requirement；
(5) if above step can not ensure that the pollution level of every kind of particle diameter material after separation all reaches requirement, start
Chemical leaching, chemical leaching is carried out by frequency conversion spray pipeline, or chemical leaching elutes alternately with clear water, until screening
The every kind of particle diameter material gone out all reaches requirement.
9. the elution method for sieving of the bed mud elution screening system of interlocked control according to claim 8, it is characterized in that, institute
State that low rotation speed is 10~15r/min, middling speed rotating speed is 15~20r/min and high speed rotating speed is 20~25r/min；The hydraulic pressure
Low pressure be 0.25~0.5MPa, middle pressure is 0.5~0.75MPa, and high pressure is 0.75~1.0MPa.
10. the elution method for sieving of the bed mud elution screening system of interlocked control according to claim 8, it is characterized in that,
The slight pollution, intermediate pollution and the division of serious pollution according to the form below, as long as having the content of a heavy metal species in bed mud corresponding
In the content range of pollution level, just belong to the pollution level：
Heavy Metal Pollution in Sediments degree divides table
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