CN110898960A - System for preparing high-quality recycled aggregate based on throwing and spraying pill crushing waste concrete - Google Patents

System for preparing high-quality recycled aggregate based on throwing and spraying pill crushing waste concrete Download PDF

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Publication number
CN110898960A
CN110898960A CN201911140998.4A CN201911140998A CN110898960A CN 110898960 A CN110898960 A CN 110898960A CN 201911140998 A CN201911140998 A CN 201911140998A CN 110898960 A CN110898960 A CN 110898960A
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China
Prior art keywords
belt
shot blasting
shot
blasting machine
recycled aggregate
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Granted
Application number
CN201911140998.4A
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Chinese (zh)
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CN110898960B (en
Inventor
房怀英
计天晨
黄文景
杨建红
张宝裕
林伟端
郑皎
秦瑞聪
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Huaqiao University
Fujian South Highway Machinery Co Ltd
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Huaqiao University
Fujian South Highway Machinery Co Ltd
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Priority to CN201911140998.4A priority Critical patent/CN110898960B/en
Publication of CN110898960A publication Critical patent/CN110898960A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/0012—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain)
    • B02C19/005—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain) the materials to be pulverised being disintegrated by collision of, or friction between, the material particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/30—Combinations with other devices, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING 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
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING 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
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING 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
    • B07B2201/00—Details applicable to machines for screening using sieves or gratings
    • B07B2201/04—Multiple deck screening devices comprising one or more superimposed screens
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Food Science & Technology (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Disintegrating Or Milling (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention provides a system for preparing high-quality recycled aggregate based on throwing and spraying shot-crushing waste concrete, which comprises an autogenous mill, a shot blasting machine or a shot blasting machine, a conveying belt, a material returning device, a belt magnetic separator and a vibrating screen, wherein the conveying belt is arranged on the conveying belt; the autogenous mill is used for crushing concrete blocks and forming a material curtain, and the shot blasting machine or the shot blasting machine is positioned on the upper half part of a discharge port of the autogenous mill and emits high-speed shots to the material curtain; the conveying belt is arranged below a discharge port of the autogenous mill; the belt magnetic separator is arranged above the conveyor belt, and the conveying direction is vertical to the direction of the conveyor belt; the vibrating screen is arranged below the outlet of the conveying belt; the material returning device is characterized in that a material inlet of the material returning device is formed in a material outlet of a vibrating screen with the screen hole size smaller than 5mm, and a material outlet of the material returning belt is formed above the belt magnetic separator. The system has the advantages of good cement mortar stripping effect, good recycled aggregate performance, high recycling rate and good economical efficiency.

Description

System for preparing high-quality recycled aggregate based on throwing and spraying pill crushing waste concrete
Technical Field
The invention relates to the technical field of preparation of high-quality recycled aggregate by using waste concrete, in particular to a system for preparing high-quality recycled aggregate based on breaking waste concrete by using throwing and spraying pills.
Background
Every year, China has buildings which are dismantled due to the fact that the years are too long to meet the requirements of regulations and the urban development needs, and the buildings are damaged due to force inefficacy factors, so that a large amount of waste concrete is generated. The recycled aggregate prepared by domestic waste concrete has low quality, a large amount of cement mortar is adhered to the surface of the aggregate, the recycling rate is low, and the economical efficiency is poor. The high-quality recycled aggregate prepared from the waste concrete can be directly used for preparing high-quality recycled concrete, is beneficial to saving resources, reducing environmental pressure and realizing sustainable development.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system for preparing high-quality recycled aggregate by blasting, blasting and crushing waste concrete, which has the advantages of good cement mortar stripping effect, good recycled aggregate performance, high recycling rate and good economy.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows: a system for preparing high-quality recycled aggregate based on throwing and spraying shot-crushing waste concrete is characterized by comprising an autogenous mill, a shot blasting machine or a shot blasting machine, a conveying belt, a material returning device, a belt magnetic separator and a vibrating screen;
the autogenous mill is used for crushing concrete blocks and forming a material curtain, and the shot blasting machine or the shot blasting machine is positioned on the upper half part of a discharge port of the autogenous mill and emits high-speed shots to the material curtain; the conveying belt is arranged below a discharge port of the autogenous mill; the belt magnetic separator is arranged above the conveyor belt, and the conveying direction is vertical to the direction of the conveyor belt; the vibrating screen is arranged below the outlet of the conveying belt; the material inlet of the material returning device is arranged at the position of a material outlet with the size of a sieve pore of the vibrating sieve smaller than 5mm, and the material outlet of the material returning belt is arranged above the belt magnetic separator;
the particle size of the concrete block is less than 55 mm.
In a preferred embodiment: the shot used by the shot blasting machine or the shot blasting machine is made of cast steel or cast iron, and the diameter of the shot is 0.6-3 mm.
In a preferred embodiment: the system for preparing the high-quality recycled aggregate based on the throwing and spraying shot crushing waste concrete further comprises a shot collecting and returning device, and the shot which is magnetically separated by the belt magnetic separator is returned to the shot blasting machine or the shot blasting machine.
In a preferred embodiment: the A end of the belt magnetic separator adopts a magnetic pulley, the B end adopts a non-magnetic pulley, and the permanent magnet is fixed between the upper and lower belt tracks of the belt magnetic separator and is close to the A end.
In a preferred embodiment: the vibrating screen is provided with three layers of screen meshes, the sizes of the screen meshes are respectively 5mm, 20mm and 30mm, and the regenerated aggregate is screened into four particle size ranges of less than 5mm, 5-20 mm, 20-30 m and more than 30 mm.
In a preferred embodiment: the dust remover is communicated with the autogenous mill and can recover a large amount of dust and fine powder generated in the autogenous mill.
Compared with the prior art, the invention has the advantages that:
1. compared with the domestic existing device for preparing recycled aggregate from waste concrete, the rough breaking device provided by the invention can be used for automatically grinding the rough breaking by utilizing the gravity of the waste concrete, so that the abrasion of a machine can be effectively reduced.
2. The shot with high hardness is used for impacting concrete block particles at high speed, the shot throwing and spraying speed is high, the impact force is high, the action area of a single shot is small, the instantaneous contact stress is large, the aggregate and the cement mortar can be completely separated, the cement mortar stripping effect is good, and the recycled aggregate performance is good.
3. Because the hardness of the shot is high, the abrasive blasting particles cannot be crushed during impact crushing, and the shot is returned to the shot blasting machine or the shot blasting machine again after being screened by the magnetic separator and can be recycled; the shot has small particle size, and can effectively crush cement mortar in the recessed part of the aggregate; the shot has large injection area, large quantity and large coverage area, can effectively and accurately destroy cement mortar, and has small damage degree to aggregate.
4. The autogenous mill is used for forming the energy consumption of the material curtain and can be converted into the gravitational potential energy of the material to realize autogenous grinding and autogenous breaking, and the energy consumption ratio is low; the kinetic energy obtained by the small-particle-size shot is mainly converted into impact force on cement mortar, and the energy consumption ratio is low. The shot still has the grinding effect in the barrel still with between the concrete piece, can further get rid of the remaining mortar on aggregate surface, is favorable to improving mortar peeling efficiency, practices thrift the energy consumption, and multiple collision and friction can also carry out the plastic to the regeneration aggregate, improves regeneration aggregate quality.
5. The material returning device carries out secondary magnetic separation with the regeneration aggregate that the particle diameter is less than 5mm, can guarantee the aggregate purity with the pellet that once magnetic separation was not sieved.
6. In the autogenous mill, cement mortar is peeled off the breakage and can produce a large amount of dust and fine powder, and the dust remover device can effectively retrieve dust and fine powder, and the system is high-efficient environmental protection.
Drawings
FIG. 1 is a flowchart illustrating the operation of a system for preparing high-quality recycled aggregate based on shot blasting to break waste concrete according to an embodiment of the present invention;
FIG. 2 is a schematic view of a system for preparing high-quality recycled aggregate based on shot blasting to break waste concrete according to an embodiment of the present invention;
Detailed Description
In the example, the concrete blocks are the waste concrete of the construction waste, and are screened to be free of impurities such as reinforcing steel bars, wood, rubber and the like. By adopting the high-quality recycled aggregate preparation system, cement mortar on the surface of waste concrete can be efficiently stripped. The invention is further described below by means of specific embodiments.
Referring to fig. 1 and 2, a system for preparing high-quality recycled aggregate based on throwing and blasting shot crushing waste concrete comprises an autogenous mill 1, a shot blasting machine or shot blasting machine 2, a conveyor belt 3, a material returning device 4, a belt magnetic separator 5 and a vibrating screen 6;
the autogenous mill 1 is used for crushing concrete blocks with the grain size smaller than 55mm and forming a material curtain, and the shot blasting machine or the shot blasting machine 2 is positioned at the upper half part of a discharge hole of the autogenous mill 1 and emits high-speed shots to the material curtain; the shot used by the shot blasting machine or the shot blasting machine 2 is made of cast steel or cast iron, and the diameter of the shot is 0.6-3 mm. The conveyor belt 3 is arranged below a discharge port of the autogenous mill 1; the belt magnetic separator 5 is arranged above the conveyor belt 3, and the conveying direction of the belt magnetic separator is vertical to the conveying direction of the conveyor belt 3; the vibrating screen 6 is arranged below the outlet of the conveyor belt 3; the material inlet of the material returning device 4 is arranged at the material outlet of the vibrating screen 6 with the screen hole size smaller than 5mm, and the material outlet of the material returning belt 4 is arranged above the belt magnetic separator 5;
the system also comprises a shot collecting and returning device which returns the shot magnetically separated by the belt magnetic separator 5 to the shot blasting machine or the shot blasting machine 2.
The A end 51 of belt magnet separator 5 adopts magnetic pulley, and B end 53 adopts non-magnetic pulley, and permanent magnet 52 is fixed in belt magnet separator upper and lower belt track and leans on A end 51 department, with the pellet magnetic separation in the regeneration aggregate of conveyer belt 3 conveying, when guaranteeing fine aggregate returning charge secondary magnetic separation simultaneously, the pellet adsorbs in A end 51, with fine aggregate separation.
The vibrating screen 6 is provided with three layers of screen meshes, the screen mesh sizes are respectively 5mm, 20mm and 30mm, the regenerated aggregate is screened into four particle size ranges of less than 5mm, 5-20 mm, 20-30 m and more than 30mm, and the aggregate with the particle size of less than 5mm is conveyed to the belt magnetic separator 5 for secondary magnetic separation by the material returning device 4.
And a dust remover 7 which is communicated with the autogenous mill and can recover a large amount of dust and fine powder generated in the autogenous mill 1.
Compared with the domestic existing device for preparing the recycled aggregate from the waste concrete, the system for preparing the high-quality recycled aggregate from the waste concrete based on the throwing and spraying pill crushing utilizes the gravity of the waste concrete to grind and roughen the waste concrete, and can effectively reduce the abrasion of a machine. The shot with high hardness is used for impacting concrete block particles at high speed, the shot throwing and spraying speed is high, the impact force is high, the action area of a single shot is small, the instantaneous contact stress is large, the aggregate and the cement mortar can be completely separated, the cement mortar stripping effect is good, and the recycled aggregate performance is good. Because the hardness of the shot is high, the abrasive blasting particles cannot be crushed during impact crushing, and the shot is returned to the shot blasting machine or the shot blasting machine again after being screened by the magnetic separator and can be recycled; the shot has small particle size, and can effectively crush cement mortar in the recessed part of the aggregate; the shot has large injection area, large quantity and large coverage area, can effectively and accurately destroy cement mortar, and has small damage degree to aggregate. The autogenous mill is used for forming the energy consumption of the material curtain and can be converted into the gravitational potential energy of the material to realize autogenous grinding and autogenous breaking, and the energy consumption ratio is low; the kinetic energy obtained by the small-particle-size shot is mainly converted into impact force on cement mortar, and the energy consumption ratio is low. The shot still has the grinding effect in the barrel still with between the concrete piece, can further get rid of the remaining mortar on aggregate surface, is favorable to improving mortar peeling efficiency, practices thrift the energy consumption, and multiple collision and friction can also carry out the plastic to the regeneration aggregate, improves regeneration aggregate quality. The material returning device carries out secondary magnetic separation with the regeneration aggregate that the particle diameter is less than 5mm, can guarantee the aggregate purity with the pellet that once magnetic separation was not sieved. In the autogenous mill, cement mortar is peeled off the breakage and can produce a large amount of dust and fine powder, and the dust remover device can effectively retrieve dust and fine powder, and the system is high-efficient environmental protection.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereby. Equivalent changes and modifications made according to the patent scope and the specification of the present invention should be covered by the present invention.

Claims (7)

1. A system for preparing high-quality recycled aggregate based on throwing and spraying shot-crushing waste concrete is characterized by comprising an autogenous mill, a shot blasting machine or a shot blasting machine, a conveying belt, a material returning device, a belt magnetic separator and a vibrating screen;
the autogenous mill is used for crushing concrete blocks and forming a material curtain, and the shot blasting machine or the shot blasting machine is positioned on the upper half part of a discharge port of the autogenous mill and emits high-speed shots to the material curtain; the conveying belt is arranged below a discharge port of the autogenous mill; the belt magnetic separator is arranged above the conveyor belt, and the conveying direction is vertical to the direction of the conveyor belt; the vibrating screen is arranged below the outlet of the conveying belt; the material returning device is characterized in that a material inlet of the material returning device is formed in a material outlet of a vibrating screen with the screen hole size smaller than 5mm, and a material outlet of the material returning belt is formed above the belt magnetic separator.
2. The system for preparing high-quality recycled aggregate based on shot blasting and crushing of waste concrete according to claim 1, wherein: the shot used by the shot blasting machine or the shot blasting machine is made of cast steel or cast iron, and the diameter of the shot is 0.6-3 mm.
3. The system for preparing high-quality recycled aggregate based on shot blasting and crushing of waste concrete according to claim 1, wherein: and the shot collecting and returning device is used for returning the magnetically selected shots to the shot blasting machine or the shot blasting machine.
4. The system for preparing high-quality recycled aggregate based on shot blasting and crushing of waste concrete according to claim 1, wherein: the A end of the belt magnetic separator adopts a magnetic pulley, the B end adopts a non-magnetic pulley, and the permanent magnet is fixed between the upper and lower belt tracks of the belt magnetic separator and is close to the A end.
5. The system for preparing high-quality recycled aggregate based on shot blasting and crushing of waste concrete according to claim 1, wherein: the dust remover is communicated with the autogenous mill and recovers a large amount of dust and fine powder generated by the jet milling chamber.
6. The system for preparing high-quality recycled aggregate based on shot blasting and crushing of waste concrete according to claim 1, wherein: the vibrating screen is provided with three layers of screen meshes, the sizes of the screen meshes are respectively 5mm, 20mm and 30mm, and the regenerated aggregate is screened into four particle size ranges of less than 5mm, 5-20 mm, 20-30 m and more than 30 mm.
7. The system for preparing high-quality recycled aggregate based on shot blasting and crushing of waste concrete according to claim 1, wherein: the particle size of the concrete block is less than 55 mm.
CN201911140998.4A 2019-11-20 2019-11-20 System for preparing high-quality recycled aggregate based on polished shot blasting broken waste concrete Active CN110898960B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112387370A (en) * 2020-10-26 2021-02-23 湖北昌耀新材料股份有限公司 Grinding process capable of improving strength of phosphogypsum ceramsite lightweight aggregate

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Publication number Priority date Publication date Assignee Title
CN1483516A (en) * 2002-09-16 2004-03-24 河南建筑材料研究设计院 Powder grinding method with jet feeding from unloading screw center of ball mill and jet feeder thereof
CN101234360A (en) * 2007-11-21 2008-08-06 京东方科技集团股份有限公司 Grinding dispersion device
CN104619463A (en) * 2012-09-14 2015-05-13 寿技研工业株式会社 Apparatus for grinding particulate substance and plant for manufacturing particulate substance
JP2017113684A (en) * 2015-12-22 2017-06-29 コトブキ技研工業株式会社 Complex production device of particulate matter and production method of the same
CN209348802U (en) * 2018-10-09 2019-09-06 广东新生环保科技股份有限公司 A kind of battery copperhead terminal selects copper except iron selects sorting mechanism
CN211412280U (en) * 2019-11-20 2020-09-04 华侨大学 Device based on broken discarded concrete preparation high-quality regeneration aggregate of throwing shot

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1483516A (en) * 2002-09-16 2004-03-24 河南建筑材料研究设计院 Powder grinding method with jet feeding from unloading screw center of ball mill and jet feeder thereof
CN101234360A (en) * 2007-11-21 2008-08-06 京东方科技集团股份有限公司 Grinding dispersion device
CN104619463A (en) * 2012-09-14 2015-05-13 寿技研工业株式会社 Apparatus for grinding particulate substance and plant for manufacturing particulate substance
JP2017113684A (en) * 2015-12-22 2017-06-29 コトブキ技研工業株式会社 Complex production device of particulate matter and production method of the same
CN209348802U (en) * 2018-10-09 2019-09-06 广东新生环保科技股份有限公司 A kind of battery copperhead terminal selects copper except iron selects sorting mechanism
CN211412280U (en) * 2019-11-20 2020-09-04 华侨大学 Device based on broken discarded concrete preparation high-quality regeneration aggregate of throwing shot

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112387370A (en) * 2020-10-26 2021-02-23 湖北昌耀新材料股份有限公司 Grinding process capable of improving strength of phosphogypsum ceramsite lightweight aggregate
CN112387370B (en) * 2020-10-26 2022-02-18 湖北昌耀新材料股份有限公司 Grinding process capable of improving strength of phosphogypsum ceramsite lightweight aggregate

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