CN112354669A - Efficient environment-friendly building waste concrete treatment process - Google Patents
Efficient environment-friendly building waste concrete treatment process Download PDFInfo
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- CN112354669A CN112354669A CN202011320243.5A CN202011320243A CN112354669A CN 112354669 A CN112354669 A CN 112354669A CN 202011320243 A CN202011320243 A CN 202011320243A CN 112354669 A CN112354669 A CN 112354669A
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- particle size
- screening
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- aggregate
- waste concrete
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Classifications
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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
- B02C23/00—Auxiliary 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
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
-
- 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
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- 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
-
- 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
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- 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
Abstract
The invention discloses an efficient environment-friendly treatment process for building waste concrete, which belongs to the field of building waste treatment and comprises the steps of primary crushing, pre-screening, primary crushing, intermediate screening, secondary crushing and finished product screening of the building waste concrete to obtain recycled aggregates with different particle size requirements. The invention can reduce the amount of dust and the proportion of fine aggregate generated in the production process and reduce the raised dust generated in the production environment; meanwhile, the treatment efficiency of the waste concrete and the quality of the recycled aggregate can be improved to a certain extent, and the efficient and environment-friendly treatment of the waste concrete in the building can be realized. The recycled aggregates with different particle sizes meet the requirements and are applied to different types of green building material products, and can make contributions to 'non-waste cities' and 'sponge cities'.
Description
Technical Field
The invention relates to the field of construction waste treatment, in particular to an efficient environment-friendly construction waste concrete treatment process.
Background
About 30 hundred million tons of construction wastes are generated in China every year, most of the construction wastes are not treated at all, and the construction wastes are transported to the suburbs or villages by construction units and are stacked or buried in the open air, so that a large amount of construction expenses such as land charge and garbage clearing and transporting expenses are consumed, and meanwhile, the problems of scattering, dust, ash and sand flying and the like in the clearing, transporting and stacking processes cause serious environmental pollution.
The construction waste concrete is used as construction waste which can be recycled with high added value, and the construction waste concrete is crushed by a mature treatment process to prepare recycled aggregate at present, and is applied to the construction of waste-free cities and sponge cities. However, the dust and noise generated by the treatment process adopted in the existing building waste concrete treatment base are large, which is a problem to be solved urgently in the current building waste concrete treatment.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an efficient and environment-friendly treatment process for waste building concrete, which can effectively reduce dust and noise generated by the treatment of the waste building concrete and improve the treatment efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an efficient environment-friendly treatment process for waste building concrete, which comprises the following steps:
step one, primary breaking; primarily breaking the recycled waste building concrete, and picking up massive steel bars, wood blocks and sundries in the waste building concrete;
step two, pre-screening; screening the building waste concrete subjected to primary breaking by a linear vibration feeder according to the particle size of the aggregate of 100mm to obtain the aggregate with the particle size of more than 100mm and the aggregate with the particle size of less than 100 mm;
step three, primary crushing; carrying out primary crushing on the pre-screened aggregates with the particle size of more than 100 mm;
step four, screening in the middle; screening the aggregate with the particle size of less than 100mm in the step two and the aggregate subjected to primary crushing in the step three according to the particle size of 31.5mm by using a linear vibration feeder to obtain the aggregate with the particle size of more than 31.5mm and the aggregate with the particle size of less than 31.5 mm;
step five, secondary crushing; after intermediate screening, the aggregates with the particle size of more than 31.5mm enter secondary crushing, and the aggregates after secondary crushing enter intermediate screening again;
screening a finished product; and after intermediate screening, the aggregates with the particle size of less than 31.5mm enter a finished product to be screened, and four kinds of recycled aggregates with different particle size ranges of 0-5mm, 5.0-16.0mm, 16.0-25.0mm and 25.0-31.5mm are obtained.
Further, in the second step, the front end of the linear vibrating feeder is provided with a grid bar of 100 mm. The grid bars with the particle size of 100mm are arranged, so that the linear vibrating feeder can feed materials for primary crushing and can play a role in pre-screening, waste concrete with the particle size of less than 100mm is prevented from entering primary crushing, and the primary crushing capacity is improved.
Furthermore, in the third step, a jaw crusher is selected for primary crushing, and the crushing ratio of the jaw crusher is 3-4. The jaw crusher with large crushing ratio can reduce the work load of subsequent equipment.
Further, in the fourth step, the middle screen is provided with a vibrating screen with 2 layers of screens, the mesh opening of the upper layer screen is 80-100mm, and the mesh opening of the lower layer screen is 31.5 mm. The upper-layer screen mesh can screen out a part of waste concrete blocks with reinforcing steel bar heads, and the lower-layer screen mesh prevents waste concrete aggregate with the particle size of less than 31.5mm from entering secondary crushing, so that the effective crushing capacity of the secondary crushing is improved, and the yield of aggregate with the particle size of more than 5mm of a finished product is improved. In this step, small-size vibrating feeder plays the guide effect to the reinforcing bar of picking up, avoids it to damage the belt.
Further, in the fifth step, a counterattack type crusher is selected for secondary crushing, and aggregates with better particle types can be obtained.
Further, in the sixth step, a vibrating screen with three layers of screens is selected for screening the finished product, and the screen hole diameters of the screens are respectively 5mm, 16mm and 25 mm.
And further, the steps are connected by a belt conveyor, a dust cover is covered on the belt, automatic iron removing equipment is additionally arranged on the belt at the rear end after the primary crushing, the intermediate screening and the secondary crushing, and negative pressure dust collecting equipment is additionally arranged at the feeding end and the discharging end of the linear vibrating feeder, the primary crushing, the intermediate screening, the secondary crushing and the finished product screening.
Compared with the prior art, the invention has the beneficial effects that:
1. two layers of screen meshes are arranged in the middle screening of the concrete reinforcing bar screening machine, the mesh aperture of the upper layer of screen mesh is 80-100mm, and waste concrete blocks with reinforcing bar heads are removed by matching with magnetic separation equipment and manual picking, so that the belt is prevented from being damaged.
2. The invention adds the intermediate screening, can reduce the working load of the secondary crushing equipment by 10 to 30 percent, and reduces the abrasion of the impact crusher.
3. The invention adds the intermediate screening, so that the environmental dust amount is reduced by 40-50%, the working load of dust collection equipment is reduced under the condition of reducing dust emission, and the cost is reduced.
4. The invention increases the intermediate screening, and can improve the capacity of the whole crushing production line by 30 to 50 percent; meanwhile, the proportion of the aggregate with the particle size of more than 5mm is greatly improved, and the amount of the aggregate with the particle size of 0-5mm is reduced by 10-40%.
5. The linear vibrating feeder is arranged, the pre-screening capacity of the whole crushing production line is improved, the waste concrete with the particle size of less than 100mm does not enter the primary crushing, the capacity of the primary crushing is improved, excessive crushing of the waste concrete is avoided, and the quality of finished aggregate and the capacity of coarse aggregate with the particle size of more than 5mm are improved.
In conclusion, compared with a dressing and crushing production line, the process of the invention has obvious economic benefit and also has obvious environmental and social benefits when in use.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Building waste is used as waste which can be recycled with high added value and high resource utilization, and more concrete grading recovery technologies exist in the prior art, for example, the Chinese patent with the patent number of 202010218540.2 discloses a building solid waste superfine aggregate grading process, wherein screening equipment is arranged at the rear ends of primary crushing and secondary crushing, and screened upper materials are returned to the crushing equipment of the previous stage, so that the secondary crushing and the tertiary crushing are protected, and part of crushing efficiency is improved. In the whole recycling process, part of materials are crushed for more than three times, and excessive crushing increases the amount of environmental dust and reduces the productivity.
In order to overcome the drawbacks of the existing recycling process, the embodiment provides an efficient and environment-friendly recycling process for waste building concrete, please refer to fig. 1, which includes the following steps:
step one, primary breaking; and (4) carrying out primary breaking on the recycled waste building concrete, and picking up massive reinforcing steel bars, wood blocks and sundries in the waste building concrete.
Step two, pre-screening; the building waste concrete after the initial breaking passes through a linear vibrating feeder, and the front end of the linear vibrating feeder is provided with a grid bar of 100 mm. And screening the aggregate with the particle size of 100mm to obtain the aggregate with the particle size of more than 100mm and the aggregate with the particle size of less than 100 mm. The grid bars with the particle size of 100mm are arranged, so that the linear vibrating feeder can feed materials for primary crushing and can play a role in pre-screening, waste concrete with the particle size of less than 100mm is prevented from entering primary crushing, and the primary crushing capacity is improved.
Step three, primary crushing; and (3) carrying out primary crushing on the aggregates with the particle size of more than 100mm after pre-screening, wherein the primary crushing adopts a jaw crusher with a large crushing ratio to obtain the aggregates with the particle size of not more than 160 mm.
Step four, screening in the middle; and (4) enabling the aggregates with the particle size smaller than 100mm in the step two and the aggregates after the primary crushing in the step three to enter the vibrating screen through the small linear vibrating feeder, and enabling the small linear vibrating feeder to play a role in guiding the picked reinforcing steel bars so as to prevent the reinforcing steel bars from damaging the belt. The vibrating screen is provided with 2 layers of screens, the mesh opening of the upper layer of screen is 80-100mm, the mesh opening of the lower layer of screen is 31.5mm, the particle size of aggregate is screened according to 31.5mm, aggregate with the particle size larger than 31.5mm and aggregate with the particle size smaller than 31.5mm are obtained, the upper layer of screen can screen out a part of waste concrete blocks with reinforcing steel bar heads, the lower layer of screen prevents waste concrete aggregate with the particle size smaller than 31.5mm from entering secondary crushing, the effective crushing capacity of secondary crushing is improved, and the aggregate yield of finished product particle size larger than 5mm is improved.
Step five, secondary crushing; and (3) performing secondary crushing on the aggregates with the particle size of more than 31.5mm after the intermediate screening, wherein a reaction crusher is selected for the secondary crushing to obtain the aggregates with the particle size of not more than 50mm, and performing intermediate screening on the aggregates after the secondary crushing.
Screening a finished product; and screening the aggregates with the particle size of less than 31.5mm after intermediate screening into a finished product, wherein the finished product is screened by a vibrating screen with three layers of screens, and the screen hole diameters of the screens are respectively 5mm, 16mm and 25mm to obtain the recycled aggregates with four different particle size ranges of 0-5mm, 5.0-16.0mm, 16.0-25.0mm and 25.0-31.5 mm.
In this embodiment, the steps further include magnetic separation and dust removal steps, specifically: the steps are connected by a belt conveyor, a dust cover is covered on the belt, automatic iron removing equipment is additionally arranged on the belt at the rear end after primary crushing, intermediate screening and secondary crushing, and negative pressure dust collecting equipment is additionally arranged at the feeding end and the discharging end of the linear vibrating feeder, the primary crushing, the intermediate screening, the secondary crushing and finished product screening.
This embodiment has set up screening equipment between one-level breakage and second grade breakage, and the material gets into the second grade breakage on the sieve, and the undersize material directly gets into the finished product sieve ejection of compact and obtains the finished product, has reduced the screening number of times of aggregate, has reduced the dust volume in the broken environment, has reduced the output of the fine aggregate below 5 mm.
Although the present invention has been described in detail with respect to the above embodiments, it will be understood by those skilled in the art that modifications or improvements based on the disclosure of the present invention may be made without departing from the spirit and scope of the invention, and these modifications and improvements are within the spirit and scope of the invention.
Claims (7)
1. An efficient environment-friendly building waste concrete treatment process is characterized by comprising the following steps:
step one, primary breaking; primarily breaking the recycled waste building concrete, and picking up massive steel bars, wood blocks and sundries in the waste building concrete;
step two, pre-screening; screening the building waste concrete subjected to primary breaking by a linear vibration feeder according to the particle size of the aggregate of 100mm to obtain the aggregate with the particle size of more than 100mm and the aggregate with the particle size of less than 100 mm;
step three, primary crushing; carrying out primary crushing on the pre-screened aggregates with the particle size of more than 100 mm;
step four, screening in the middle; screening the aggregate with the particle size of less than 100mm in the step two and the aggregate subjected to primary crushing in the step three according to the particle size of 31.5mm by using a linear vibration feeder to obtain the aggregate with the particle size of more than 31.5mm and the aggregate with the particle size of less than 31.5 mm;
step five, secondary crushing; after intermediate screening, the aggregates with the particle size of more than 31.5mm enter secondary crushing, and the aggregates after secondary crushing enter intermediate screening again;
screening a finished product; and after intermediate screening, the aggregates with the particle size of less than 31.5mm enter a finished product to be screened, and four kinds of recycled aggregates with different particle size ranges of 0-5mm, 5.0-16.0mm, 16.0-25.0mm and 25.0-31.5mm are obtained.
2. The process for treating the waste concrete of the building in the high efficiency and the environment friendly manner as claimed in claim 1, wherein in the second step, the front end of the linear vibrating feeder is provided with a grid bar of 100 mm.
3. The process for treating the high-efficiency environment-friendly building waste concrete as claimed in claim 1, wherein in the third step, a jaw crusher is selected for primary crushing, and the crushing ratio of the jaw crusher is 3-4.
4. The process for treating waste concrete of building in environment protecting mode with high efficiency as claimed in claim 1, wherein in the fourth step, the middle screen is equipped with vibrating screen with 2 layers of screen mesh, the mesh aperture of the upper layer screen mesh is 80-100mm, and the mesh aperture of the lower layer screen mesh is 31.5 mm.
5. The process for treating waste concrete of buildings in an efficient and environment-friendly manner as claimed in claim 1, wherein in the fifth step, the second-stage crushing employs a counter-impact crusher.
6. The process for treating waste concrete of buildings in high efficiency and environmental protection type as claimed in claim 1, wherein in the sixth step, the finished product is screened by a vibrating screen equipped with three layers of screens, the screen holes are 5mm, 16mm and 25mm respectively.
7. The process of claim 1, wherein the steps are connected by a belt conveyor, the belt is covered with a dust cover, an automatic iron removing device is additionally arranged on the rear end belt after the primary crushing, the intermediate screening and the secondary crushing, and a negative pressure dust collecting device is additionally arranged on the feeding end and the discharging end of the linear vibrating feeder, the primary crushing, the intermediate screening, the secondary crushing and the finished product screening.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011320243.5A CN112354669A (en) | 2020-11-23 | 2020-11-23 | Efficient environment-friendly building waste concrete treatment process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011320243.5A CN112354669A (en) | 2020-11-23 | 2020-11-23 | Efficient environment-friendly building waste concrete treatment process |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113290694A (en) * | 2021-06-18 | 2021-08-24 | 杭州三中新型建材科技有限公司 | Efficient concrete production process and production line |
| CN113318847A (en) * | 2021-06-10 | 2021-08-31 | 上海建工建材科技集团股份有限公司 | Environment-friendly flying dust-free concrete recycled aggregate preparation system and preparation method |
| CN113860778A (en) * | 2021-11-03 | 2021-12-31 | 苏州和锦科技有限公司 | Preparation process for recycling concrete building material by utilizing construction waste |
| CN114226043A (en) * | 2021-11-02 | 2022-03-25 | 佛山市交通科技有限公司 | Three-stage crushing system and method for asphalt mixture |
| CN114535097A (en) * | 2022-03-04 | 2022-05-27 | 深圳市森蓝建设集团有限公司 | Construction waste classification treatment method and device |
| CN114653454A (en) * | 2022-03-08 | 2022-06-24 | 深圳市天健(集团)股份有限公司 | Construction waste recycling-integration system |
| CN115594430A (en) * | 2022-10-03 | 2023-01-13 | 天津朝阳环保科技集团有限公司（Cn） | Production method of aggregate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113318847A (en) * | 2021-06-10 | 2021-08-31 | 上海建工建材科技集团股份有限公司 | Environment-friendly flying dust-free concrete recycled aggregate preparation system and preparation method |
| CN113290694A (en) * | 2021-06-18 | 2021-08-24 | 杭州三中新型建材科技有限公司 | Efficient concrete production process and production line |
| CN114226043A (en) * | 2021-11-02 | 2022-03-25 | 佛山市交通科技有限公司 | Three-stage crushing system and method for asphalt mixture |
| CN113860778A (en) * | 2021-11-03 | 2021-12-31 | 苏州和锦科技有限公司 | Preparation process for recycling concrete building material by utilizing construction waste |
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| CN114653454A (en) * | 2022-03-08 | 2022-06-24 | 深圳市天健(集团)股份有限公司 | Construction waste recycling-integration system |
| CN115594430A (en) * | 2022-10-03 | 2023-01-13 | 天津朝阳环保科技集团有限公司（Cn） | Production method of aggregate |
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