CN110883056A - Screening system and method for recycled aggregate recovery - Google Patents

Screening system and method for recycled aggregate recovery Download PDF

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Publication number
CN110883056A
CN110883056A CN201911194007.0A CN201911194007A CN110883056A CN 110883056 A CN110883056 A CN 110883056A CN 201911194007 A CN201911194007 A CN 201911194007A CN 110883056 A CN110883056 A CN 110883056A
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CN
China
Prior art keywords
screening
screen
aggregate
recycled aggregate
recovery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911194007.0A
Other languages
Chinese (zh)
Inventor
杜金业
黄剑斌
蔡鹏�
秦双迎
李居涛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huaqiao University
Fujian South Highway Machinery Co Ltd
Original Assignee
Huaqiao University
Fujian South Highway Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huaqiao University, Fujian South Highway Machinery Co Ltd filed Critical Huaqiao University
Priority to CN201911194007.0A priority Critical patent/CN110883056A/en
Publication of CN110883056A publication Critical patent/CN110883056A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09BDISPOSAL OF SOLID WASTE
    • B09B3/00Destroying solid waste or transforming solid waste or contaminated solids into something useful or harmless
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00Other disintegrating devices or methods
    • B02C19/06Jet mills
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/14Separating or sorting of material, associated with crushing or disintegrating with more than one separator
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/42Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46Constructional details of screens in general; Cleaning or heating of screens
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00Selective separation of solid materials carried by, or dispersed in, gas currents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B9/00Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09BDISPOSAL OF SOLID WASTE
    • B09B5/00Operations not covered by single other subclass or by a single other group in this subclass
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/58Construction or demolition [C&D] waste

Abstract

The invention discloses a screening system and a screening method for recycled aggregate recovery, which comprise the following steps: pre-screening device: screening the concrete waste according to different required specifications; and (3) a jet milling device: carrying out abrasive blasting on the recycled aggregate; fine screening device: screening the milled aggregate according to different required specifications; the pre-screening device, the abrasive blasting device and the fine screening device are sequentially connected according to the production flow of the recycled aggregate; the screening problems that the construction waste concrete waste is complex, various and moist, contains much powder in primary crushing, is difficult to screen and is easy to block a net can be solved; further cleaning the dust and residual mortar on the surface of the finished aggregate to obtain high-quality recycled aggregate; the screening method of the recycled aggregate recovery system provided by the invention not only can realize high-quality recovery of cement concrete aggregate, but also can solve the problem that the recycled asphalt fine material is sticky and wet and is difficult to screen, has high screening precision, can realize screening of large particles of the recycled asphalt aggregate and fine particles of asphalt below 5mm, and has a compact structure.

Description

Screening system and method for recycled aggregate recovery
Technical Field
The invention relates to the technical field of recycled aggregate recovery, in particular to a screening system and a screening method for recycled aggregate recovery.
Background
In recent years, with the increasing amount of waste materials of cement concrete and asphalt concrete, the problem of high aggregate price caused by insufficient primary aggregate has become an important issue to be researched and solved urgently in society for recycling and reusing aggregate in waste concrete.
As is well known, the aggregate in concrete waste is recycled by performing primary crushing on site to obtain raw materials, generally particles with a particle size of 100mm or less (preferably 0-40mm), required by an aggregate recycling system, and performing further processing on the raw materials, for example, removing attachments such as mortar, dust, soil and the like attached to the surface of the aggregate by using a process such as re-crushing (or jet milling, shot blasting) and the like, and then screening and grading to obtain high-quality recycled coarse aggregate and fine aggregate.
Because concrete waste material is complicated various, moist, contain debris such as dregs, elementary crushing process can produce a large amount of mortar powder, this part fines if do not sieve out in advance, get into in the breakage (or abrasive blasting, peening) device again among the aggregate regeneration system, not only make output reduce, also can aggravate the loss of abrasive blasting device internals, this part fines moisture content is high moreover, lead to breakage (or abrasive blasting, peening) inner chamber device long-pending material again easily, cause unnecessary influence.
Because the water content of the fine materials is high, particularly the asphalt reclaimed material with the asphalt content of less than 5mm is high in asphalt content and viscosity, if the conventional screening technology is used for screening the fine materials, the problems of low screening efficiency, low yield, easy blockage of a screen and difficult cleaning exist, and the bottleneck of the aggregate regeneration technology is formed.
Disclosure of Invention
The invention aims to overcome the defects and provide a screening system and a screening method for recycled aggregate recovery.
In order to achieve the purpose, the technical solution of the invention is as follows: a screening system for recycled aggregate recovery, comprising:
pre-screening device: screening the concrete waste according to different required specifications;
and (3) a jet milling device: carrying out abrasive blasting on the recycled aggregate;
fine screening device: screening the milled aggregate according to different required specifications;
and the pre-screening device, the abrasive blasting device and the fine screening device are sequentially connected according to the production flow of the recycled aggregate.
Preferably, the pre-screening device is any one of a relaxation screen, a multi-frequency vibrating screen, a circular vibrating screen, a rotary screen and a linear vibrating screen.
Preferably, the fine screening device is any one of an air screening mechanism, an elliptical screening mechanism and a multi-stage combined screening mechanism.
Preferably, the relaxation sieve is provided with a tooth-shaped sieve mechanism, a tooth-shaped sieve bar and a relaxation sieve structure.
Preferably, the air screening mechanism includes air classification room, air-blower, recovery filter, dispersion devices and shale shaker, the air-blower sets up in one side of air classification room, it sets up in the opposite side of air classification room to retrieve the filter, dispersion devices sets up in the feed inlet of air classification room for with the even cloth of aggregate, the shale shaker sets up in the bottom of air classification room, sieves the aggregate, the shale shaker includes a plurality of layers of screen cloth that top-down set gradually, and the sieve mesh specification top-down of each screen cloth reduces in proper order.
Preferably, the bottom of the vibrating screen is provided with an anti-blocking device for preventing blockage.
Preferably, oval sieve mechanism includes the support, sets up elastomer and the drive unit on the support, sets up sieve case and the vibration exciter of setting in support one side in the elastomer upper end, the elastomer will sieve case horizontal support, drive unit is connected with the vibration exciter transmission, and can drive each vibration exciter and shake in step, will sieve the case and be oval trail motion under the elastomer cooperation.
Preferably, multistage combination screening mechanism includes first sieve case and second sieve case that top-down arranged, first sieve case is the circle and shakes the sieve, sieves coarse aggregate, the second sieve case is the high frequency sieve, sieves fine aggregate, the aggregate that easily bonds, and the sieve mesh specification of first sieve case and second sieve case reduces in proper order.
A screening method for recycled aggregate recovery adopts the screening system for recycled aggregate recovery, and comprises the following steps in sequence:
s1, pre-screening treatment: screening the concrete waste material according to different required specifications through a pre-screening device;
s2, abrasive blasting: carrying out abrasive blasting on the aggregate subjected to the pre-screening treatment by an abrasive blasting device;
s3, fine screening treatment: and screening the milled aggregate through a fine screening device according to different required specifications.
Preferably, after step S3, the finished aggregate is subjected to a humidification treatment.
By adopting the technical scheme, the invention has the beneficial effects that: through the relaxation sieve, the screening problems of difficult screening and easy net blocking, such as complicated and various construction waste concrete waste materials, dampness, large powder content in primary crushing, and the like, can be solved; screening by adopting an air screening mechanism, combining winnowing and vibration screening, separating powder in the crushing process in advance, and further cleaning dust and residual mortar on the surface of finished aggregate to obtain high-quality recycled aggregate; the elliptical sieve mechanism has a compact structure, can solve the problems that a screen mesh of a linear vibrating sieve is easy to block, the circular vibrating sieve has large overall dimension and low sieving precision, and can obtain high-quality regenerated finished sand; according to the screening method of the recycled aggregate recovery system, provided by the invention, through the recycled aggregate recovery system, not only can high-quality recovery of cement concrete aggregate be realized, but also the problem that the recycled asphalt concrete fine material is sticky and difficult to screen can be solved, the screening precision is high, the screening of large asphalt recycled aggregate particles and fine asphalt particles below 5mm can be realized, and the structure is compact.
Drawings
FIG. 1 is a schematic structural diagram of a screening system according to example 1 of the present invention;
FIG. 2 is a schematic structural diagram of a screening system according to example 2 of the present invention;
FIG. 3 is an enlarged view taken at A of FIG. 2 in accordance with the present invention;
FIG. 4 is a schematic structural diagram of a screening system according to embodiment 3 of the present invention;
FIG. 5 is a schematic flow diagram of a screening method of the present invention;
description of the main reference numerals: the device comprises a relaxation sieve 1, an air sieving mechanism 2, a winnowing chamber 21, an air blower 22, a recovery filter 23, a dispersing device 24, a vibrating sieve 25, an anti-blocking device 3, an elliptical sieve mechanism 4, a support 41, a sieve box 42, an elastic body 43, a driving unit 44, a vibration exciter 45, a multi-frequency vibrating sieve 5, a probability sieve 6, a multi-stage combined sieving mechanism 7, a first sieve box 71, a second sieve box 72, a pre-sieving device A, an abrasive blasting device B and a fine sieving device C.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments.
The invention relates to a screening system for recycling recycled aggregate
As shown in fig. 1 to 4, a sieving system for recycled aggregate recovery includes:
pre-screening device A: screening the concrete waste according to different required specifications;
and (3) a jet milling device B: carrying out abrasive blasting on the recycled aggregate;
fine screening device C: screening the milled aggregate according to different required specifications;
and the pre-screening device A, the abrasive blasting device B and the fine screening device C are sequentially connected according to the production flow of the recycled aggregate.
The pre-screening device A is any one of a relaxation screen 1, a multi-frequency vibrating screen 5, a circular vibrating screen, a rotary screen and a linear vibrating screen.
The fine screening device C is any one of an air screening mechanism 2, an elliptical screening mechanism 4 and a multi-stage combined screening mechanism 7.
The relaxation sieve 1 is provided with a dentate screen mechanism, dentate screen bars and a relaxation screen structure.
Air screening mechanism 2 includes air classification room 21, air-blower 22, retrieves filter 23, dispersion devices 24 and shale shaker 25, air-blower 22 sets up in one side of air classification room 21, it sets up in the opposite side of air classification room 21 to retrieve filter 23, dispersion devices 24 sets up in the feed inlet of air classification room 21 for with the even cloth of aggregate, shale shaker 25 sets up in the bottom of air classification room 21, sieves the aggregate, shale shaker 25 includes a plurality of layers of screen cloth that top-down set gradually, and the sieve mesh specification top-down of each screen cloth reduces in proper order.
The bottom of the vibrating screen 25 is provided with an anti-blocking device 3 for preventing blockage.
The elliptical sieve mechanism 4 comprises a support 41, an elastic body 43 and a driving unit 44 which are arranged on the support 41, a sieve box 42 arranged at the upper end of the elastic body 43 and a vibration exciter 45 arranged on one side of the support, wherein the elastic body 43 horizontally supports the sieve box 42, the driving unit 44 is in transmission connection with the vibration exciter 45 and can drive the vibration exciters 45 to synchronously vibrate, and the sieve box 42 moves in an elliptical track under the cooperation of the elastic body 43.
Multistage combination screening mechanism 7 includes first sieve case 71 and second sieve case 72 that top-down arranged, first sieve case 71 is the circle sieve that shakes, sieves coarse aggregate, second sieve case 72 is the high frequency sieve, sieves fine aggregate, the aggregate that easily bonds, and the sieve mesh specification of first sieve case 71 and second sieve case 72 reduces in proper order.
The invention relates to a screening method for recycling recycled aggregate
As shown in fig. 5, a screening method for recycled aggregate recovery, which employs the above screening system for recycled aggregate recovery, comprises the following steps in sequence:
s1, pre-screening treatment: screening the concrete waste material according to different required specifications through a pre-screening device A;
s2, abrasive blasting: carrying out abrasive blasting on the aggregate subjected to the pre-screening treatment by an abrasive blasting device B;
s3, fine screening treatment: and screening the milled aggregate through a fine screening device C according to different required specifications.
After step S3, the finished aggregate needs to be humidified.
Example 1
This example is directed to the recovery of recycled cement concrete aggregate
As shown in fig. 1, aiming at the characteristics of complex and various construction waste, moisture, and impurities such as muck, the pre-screening device a for the raw materials can adopt a tension-relaxation screen 1 suitable for screening the construction waste, and screen the initially crushed concrete waste into the raw material specifications required by the recycled aggregate recovery system: for example, recycled aggregate raw materials (5-40mm), abrasive particles (0-5mm), over-specification materials (>40mm) and impurities are returned to the primary crushing main machine through a material returning system for re-crushing or separation; the flip-flow screen 1 is provided with a tooth-shaped screen mechanism and a tooth-shaped screen bar which are suitable for screening large aggregates of construction waste and a mesh structure of the flip-flow screen 1 which is suitable for screening wet fine materials; the fine material sieved by the relaxation sieve 1, such as (0-5mm) abrasive blasting particles can be further subjected to a well-known powder separation device to remove a part of fine powder, and then the abrasive blasting particles are fed into an abrasive blasting device B; if the concrete waste is dry and contains less impurities, the pre-screening device A can also use conventional screening equipment such as a well-known circular vibrating screen, a rotary screen, a linear vibrating screen 25 and the like for screening; fine screening of the recycled aggregate finished product, wherein the fine screening device C can adopt an air screening mechanism 2 for screening according to the requirement; the air screening mechanism 2 comprises an air blower 22, a recovery filter 23, a dispersing device 24, an air separation chamber 21 and a vibrating screen 25, the finished product mixture processed by the jet mill device B is fed into the air screening mechanism 2 through the dispersing device 24, the air separation and the vibrating screen 25 are combined through the fan, the air separation chamber 21, the vibrating screen 25 and the recovery filter 23 connected to the negative pressure dust removal device, powder is separated in advance, dust and residual mortar on the surface of the finished product aggregate are further cleaned, and high-quality recycled aggregate is obtained; the side of the air separation chamber 21 is provided with an air blower 22, and the other side of the air separation chamber is connected with a recovery filter 23 connected with a negative pressure dust remover; the dispersing device 24 is arranged at the feed inlet of the air separation chamber 21 to realize uniform material distribution of the materials; the bottom of the winnowing chamber 21 is provided with a vibrating screen 25, the vibrating screen 25 is formed by arranging a plurality of layers of screen meshes from top to bottom, multi-stage screening is carried out through the plurality of layers of screen meshes, the sizes of the screen meshes are sequentially reduced from top to bottom so as to meet the screening of aggregates with different amounts, the screening quality is improved, and finished recycled aggregates with a plurality of sizes can be obtained by the same vibrating screen 25; the bottom of the screen of the vibrating screen 25 is provided with an anti-blocking device 3 (such as an anti-blocking screen); the fine finished product materials screened by the air screening mechanism 2 can partially return to the abrasive blasting device B to supplement abrasive blasting particles, and can also enter a storage system to be stored together with other materials; the finished fine particles can also be subjected to humidification treatment by a humidifier, so that the recycled fine aggregate contains proper moisture and is convenient to transport.
Example 2
This example is directed to the recovery of recycled cement concrete aggregate
As shown in fig. 2-3, aiming at the characteristics of complex and various construction waste, moisture, and impurities such as dregs, the pre-screening device a for raw materials can adopt a tension-relaxation screen 1 suitable for screening construction waste, and screen the initially crushed concrete waste into raw material specifications required by a recycled aggregate recovery system: for example, recycled aggregate raw materials (5-40mm), abrasive particles (0-5mm), over-specification materials (>40mm) and impurities are returned to the primary crushing main machine through a material returning system for re-crushing or separation; the relaxation sieve 1 is provided with a tooth-shaped screen mechanism and a tooth-shaped screen bar which are suitable for screening large aggregates of construction waste and a relaxation screen structure which is suitable for screening wet fine materials; the fine material sieved by the relaxation sieve 1, such as (0-5mm) abrasive blasting particles can be further subjected to a well-known powder separation device to remove a part of fine powder, and then the abrasive blasting particles are fed into an abrasive blasting device B; if the concrete waste is dry and contains less impurities, the pre-screening device A can also use conventional screening equipment such as a well-known circular vibrating screen, a rotary screen, a linear vibrating screen 25 and the like for screening; the fine screening device C for the recycled aggregate finished products can adopt an elliptical screening mechanism 4, the elliptical screening mechanism 4 comprises a screening box 42, a vibration exciter 45 and a driving unit 44, the screening box 42 is supported and connected to the floor type support 41 through an elastic body 43 and is in a horizontal shape, the driving unit 44 is in transmission connection with the vibration exciter 45 to drive the vibration exciter 45 to vibrate synchronously, the vibration exciter 45 vibrates synchronously and is matched with the elastic body 43 to enable the motion trail of the screening box 42 to be in an elliptical trail; the elliptical sieve mechanism 4 receives the recycled aggregate processed by the abrasive blasting device B and sieves the recycled aggregate into finished coarse aggregate and fine aggregate with a plurality of specifications, so that the problems that a screen mesh of a linear vibrating sieve 25 is easy to block, the yield is low, the external dimension of the circular vibrating sieve is large, and the sieving precision is low are solved; the finished fine aggregate after being screened by the elliptical screening mechanism 4 can be further screened by a probability screen 6 or the air screening mechanism 2 to obtain high-quality regenerated finished sand; the regenerated finished sand can also be humidified by a humidifier, so that the regenerated fine aggregate contains proper moisture and is convenient to transport.
Example 3
This example is directed to the recovery of recycled asphalt concrete aggregate
The regeneration of the asphalt pavement is to dig and mill the old asphalt pavement, recycle the old materials, further crush and screen the old materials, and mix the old materials with new asphalt mixture. The abrasion device strips the recycled aggregate from the asphalt on the surface of the aggregate through technologies such as jet milling and the like, the content of the fine materials and the asphalt milling material asphalt below 5mm is high, the abrasion device can be used for recycling the asphalt pavement surface layer, has special economic value, and is difficult to screen.
As shown in fig. 4, for the characteristics of high viscosity and difficult screening of the fine asphalt, the raw material can be pre-screened by a multi-frequency vibrating screen 5, and the primarily milled reclaimed material is screened into the raw material specification required by the reclaimed aggregate recovery system according to the requirement: for example: materials with grades of 40-100mm, 20-40mm, 5-10mm, 0-5mm and the like are fed into a jet mill device B for further processing, and unqualified materials are returned to a primary crushing host machine for re-crushing; the multi-frequency vibrating screen 5 combines the advantages of a circular vibrating screen and a high-frequency screen, the circular vibrating screen is suitable for screening materials which are easy to screen, such as coarse particles, and the like, the high-frequency vibration exciter 45 of the high-frequency screen is suitable for screening materials which are difficult to screen, such as asphalt reclaimed materials, fine materials, special viscous materials and the like, and the screening problem of the special viscous materials can be effectively solved; the pre-screening of the raw materials of the asphalt concrete aggregate recovery system can also use the flip-flow screen 1 for screening; the fine screening of the recycled aggregate finished product can be performed by a multistage combined screening mechanism 7 according to the characteristics of the recycled asphalt material; the multistage combined screening mechanism 7 includes a first screen box 71 and a second screen box 72: the first screen box 71 can be a circular vibrating screen suitable for screening large materials, and the second screen box 72 can be a high-frequency screen suitable for screening fine materials and easily-bonded materials; the multistage combined screening mechanism 7 is characterized in that a plurality of layers of screens are arranged from top to bottom, screen holes are sequentially reduced from top to bottom so as to screen aggregates with different quantities and improve screening quality, and a plurality of finished product specifications of recycled aggregates can be obtained by the same screening device; the accurate screening of the finished asphalt recycled aggregate can also be carried out by using the multi-layer flip-flow screen 1 structure, the flip-flow screen 1 consists of a plurality of layers of screens, and a tooth-shaped screen mechanism suitable for screening large aggregates and the layers of the mesh structure of the flip-flow screen 1 suitable for screening wet fine materials can be arranged according to actual requirements for combination.
In conclusion, the tension-relaxation sieve 1 can solve the sieving problems of difficult sieving and easy net blocking, such as complex and various construction waste concrete waste, dampness, large powder content in primary crushing, and the like; an air screening mechanism 2 is adopted, and air separation and a vibrating screen 25 are combined, so that powder in the crushing process is separated in advance, dust and residual mortar on the surface of finished aggregate are further cleaned, and high-quality recycled aggregate can be obtained; the elliptical sieve mechanism 4 has a compact structure, can solve the problems that a screen mesh of the linear vibrating sieve 25 is easy to block, the circular vibrating sieve has large overall dimension and low sieving precision, and can obtain high-quality regenerated finished sand; according to the screening method of the recycled aggregate recovery system, provided by the invention, through the recycled aggregate recovery system, not only can high-quality recovery of cement concrete aggregate be realized, but also the problem that the recycled asphalt concrete fine material is sticky and difficult to screen can be solved, the screening precision is high, the screening of large asphalt recycled aggregate particles and fine asphalt particles below 5mm can be realized, and the structure is compact.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention, and all equivalent changes and modifications made in the claims of the present invention should be included in the scope of the present invention.

Claims (10)

1. A screening system for recycled aggregate recovery, comprising:
pre-screening device: screening the concrete waste according to different required specifications;
and (3) a jet milling device: carrying out abrasive blasting on the recycled aggregate;
fine screening device: screening the milled aggregate according to different required specifications;
and the pre-screening device, the abrasive blasting device and the fine screening device are sequentially connected according to the production flow of the recycled aggregate.
2. A screening system for recycled aggregate recovery according to claim 1, wherein said pre-screening device is any one of a relaxation screen, a multi-frequency vibrating screen, a circular vibrating screen, a drum screen and a linear vibrating screen.
3. The screening system for recycled aggregate recovery of claim 1, wherein the fine screening device is any one of an air screening mechanism, an elliptical screening mechanism and a multi-stage combined screening mechanism.
4. A screening system for recycled aggregate recovery as recited in claim 2, wherein said relaxation screen is provided with a toothed screening mechanism, toothed rider bars and a relaxation screen structure.
5. The system of claim 3, wherein the air screening mechanism comprises an air separation chamber, an air blower, a recovery filter, a dispersing device and a vibrating screen, the air blower is arranged at one side of the air separation chamber, the recovery filter is arranged at the other side of the air separation chamber, the dispersing device is arranged at a feed inlet of the air separation chamber and is used for uniformly distributing the aggregates, the vibrating screen is arranged at the bottom of the air separation chamber and is used for screening the aggregates, the vibrating screen comprises a plurality of layers of screens which are sequentially arranged from top to bottom, and the screen mesh sizes of the screens are sequentially reduced from top to bottom.
6. A screening system for recycled aggregate recovery according to claim 5, wherein the bottom of the vibrating screen is provided with anti-blocking means to prevent clogging.
7. The screening system for recycled aggregate recovery according to claim 3, wherein the elliptical screening mechanism comprises a bracket, an elastic body and a driving unit which are arranged on the bracket, a screening box arranged at the upper end of the elastic body, and a vibration exciter arranged on one side of the bracket, wherein the elastic body horizontally supports the screening box, the driving unit is in transmission connection with the vibration exciter and can drive the vibration exciters to synchronously vibrate, and the screening box moves in an elliptical track under the cooperation of the elastic body.
8. The screening system for recycled aggregate recovery according to claim 3, wherein the multistage combined screening mechanism comprises a first screening box and a second screening box which are arranged from top to bottom, the first screening box is a circular vibrating screen and is used for screening coarse aggregates, the second screening box is a high-frequency screen and is used for screening fine aggregates and easily-bonded aggregates, and the screen mesh sizes of the first screening box and the second screening box are sequentially reduced.
9. A screening method for recycled aggregate recovery using a screening system for recycled aggregate recovery according to any one of claims 1 to 8, wherein: comprises the following steps which are carried out in sequence:
s1, pre-screening treatment: screening the concrete waste material according to different required specifications through a pre-screening device;
s2, abrasive blasting: carrying out abrasive blasting on the aggregate subjected to the pre-screening treatment by an abrasive blasting device;
s3, fine screening treatment: and screening the milled aggregate through a fine screening device according to different required specifications.
10. The screening method for recycled aggregate recycling according to claim 9, wherein the finished aggregate is subjected to a humidification treatment after step S3.
CN201911194007.0A 2019-11-28 2019-11-28 Screening system and method for recycled aggregate recovery Pending CN110883056A (en)

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CN201911194007.0A CN110883056A (en) 2019-11-28 2019-11-28 Screening system and method for recycled aggregate recovery

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CN201911194007.0A CN110883056A (en) 2019-11-28 2019-11-28 Screening system and method for recycled aggregate recovery

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CN110883056A true CN110883056A (en) 2020-03-17

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CN (1) CN110883056A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111514799A (en) * 2020-05-06 2020-08-11 苍南县恒基混凝土有限公司 Concrete processing device with tailing recycling mechanism
CN111825361A (en) * 2020-08-03 2020-10-27 中交一公局集团有限公司 Regenerated aggregate particle surface strengthening equipment and operation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111514799A (en) * 2020-05-06 2020-08-11 苍南县恒基混凝土有限公司 Concrete processing device with tailing recycling mechanism
CN111825361A (en) * 2020-08-03 2020-10-27 中交一公局集团有限公司 Regenerated aggregate particle surface strengthening equipment and operation method thereof

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