CN111299303A - Production process for preparing recycled aggregate from building construction residual materials - Google Patents
Production process for preparing recycled aggregate from building construction residual materials Download PDFInfo
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- CN111299303A CN111299303A CN202010213246.2A CN202010213246A CN111299303A CN 111299303 A CN111299303 A CN 111299303A CN 202010213246 A CN202010213246 A CN 202010213246A CN 111299303 A CN111299303 A CN 111299303A
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- recycled aggregate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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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
- Y02W30/20—Waste processing or separation
-
- 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
- Y02W30/58—Construction or demolition [C&D] waste
-
- 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
- Y02W30/78—Recycling of wood or furniture waste
-
- 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)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A production process for preparing recycled aggregate from building construction residues comprises the following steps: collecting construction residues, crushing, screening for the first time, magnetically separating, settling, drying, mixing, grinding, screening for the second time and packaging. According to the invention, the slump of the recycled aggregate can be effectively reduced by adding the fly ash and the high-efficiency water reducing agent, the contractility of the recycled aggregate can be effectively improved by multiple crushing, impurities can be effectively removed by magnetic separation, sedimentation and air separation, and the quality of the recycled aggregate is improved.
Description
Technical Field
The invention relates to the technical field of building engineering, in particular to a production process for preparing recycled aggregate from building construction residues.
Background
At present, the quantity of the construction waste in China accounts for 30 to 40 percent of the total quantity of the municipal waste. Most of the construction waste is not treated at all, and is treated in an open-air stacking or landfill mode, so that serious environmental pollution is caused. The waste concrete is used as the most important component of the construction waste, and the estimated amount of the waste concrete in China in 2003 reaches 1.8 hundred million tons, which causes great negative effects on the environment. Meanwhile, a large amount of sandstone aggregate is needed for concrete production, and with continuous exploitation of natural sandstone, natural aggregate resources tend to be exhausted, and the exploitation has the disadvantages of remarkable transportation energy consumption and cost and serious damage to the ecological environment.
The recycled aggregate concrete is called recycled concrete for short, and the waste concrete is also called mother concrete as the source of the recycled aggregate. Aggregate formed by crushing, cleaning and grading the waste concrete blocks is called recycled aggregate for short; the concrete prepared by replacing part or all of natural aggregates such as sand stone and the like with the recycled aggregate is called recycled aggregate concrete. The recycled aggregate concrete is fully utilized, the quantity of construction waste can be effectively reduced, the pollution of the construction waste to the natural environment is reduced, and the exploitation of natural aggregate in construction engineering can be reduced by utilizing the recycled aggregate to manufacture the recycled aggregate concrete, so that the aim of protecting the environment is fulfilled.
Impurities cannot be effectively removed in the existing regenerated aggregate production process, and the aggregate produced by the existing process has high slump and poor contractibility.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a production process for preparing recycled aggregate from building construction residues, which can effectively remove impurities, reduce slump and improve contractility.
In order to achieve the aim of the invention, the invention adopts the specific scheme that:
a production process for preparing recycled aggregate from building construction residues comprises the following steps:
(1) collecting construction residues: stacking waste concrete in a building dismantled in the building construction process and defective concrete caused by misoperation in the construction process on an empty site, and performing epidemic prevention treatment on the waste concrete and the defective concrete;
(2) crushing and first screening: sorting out large steel bars and wood chips stacked in the building residue on the site, and crushing by using a crushing device;
(3) magnetic separation: pouring the residual material in the step (2) into a magnetic separator to remove fine metal impurities;
(4) and (3) settling: pouring the residual materials obtained in the step (3) into a settling pond, soaking for 1d, stirring for 10 minutes every 3 hours, keeping still for 3-5 hours, fishing out impurities floating on the water surface, fishing out the residual materials, and maintaining for 1-3d at the temperature of 20-30 ℃;
(5) and (3) drying: pouring the residual material obtained in the step (4) into a dryer, and drying for 2-4 hours at the temperature of 100-;
(6) mixing: pouring the residual material obtained in the step (5) into a stirrer, adding the fly ash and the high-efficiency water reducing agent, and stirring for 30-60 minutes;
(7) grinding: pouring the residual material obtained in the step (6) into a spherical grinder, and grinding fine powder;
(8) and (3) screening for the second time: putting the fine powder obtained in the step (7) into a screening device for screening, and screening out recycled aggregate with the particle size of 1-5 mm;
(9) packaging: and (4) putting the recycled aggregate obtained in the step (8) into a winnowing device, removing the light drifts through wind power, and then packaging through a packaging device.
As an improvement, the crushing device is a double-rotor hammer crusher.
As an improvement, the metal impurities comprise broken steel bars and iron nails.
As an improvement, the impurities in the step (4) comprise low-density plastics, wood, grass roots and barks.
As an improvement, the screening device is a screen frame vibration type electric screen.
As an improvement, the winnowing device further comprises a dust removal device.
The invention has the beneficial effects that:
the slump of the recycled aggregate can be effectively reduced by adding the fly ash and the high-efficiency water reducing agent, the contractility of the recycled aggregate can be effectively improved by multiple crushing, impurities can be effectively removed by magnetic separation, sedimentation and winnowing, and the quality of the recycled aggregate is improved.
Detailed Description
The present invention is further described below by way of specific examples, but the present invention is not limited to only the following examples. Variations, combinations, or substitutions of the invention, which are within the scope of the invention or the spirit, scope of the invention, will be apparent to those of skill in the art and are within the scope of the invention.
Example 1:
a production process for preparing recycled aggregate from building construction residues comprises the following steps:
(1) collecting construction residues: stacking waste concrete in a building dismantled in the building construction process and defective concrete caused by misoperation in the construction process on an empty site, and performing epidemic prevention treatment on the waste concrete and the defective concrete;
(2) crushing and first screening: sorting out large steel bars and wood chips stacked in the building residue on the site, and crushing by using a crushing device;
(3) magnetic separation: pouring the residual material in the step (2) into a magnetic separator to remove fine metal impurities;
(4) and (3) settling: pouring the residual materials obtained in the step (3) into a settling pond, soaking for 1d, stirring for 10 minutes every 3 hours, keeping still for 3 hours, fishing out impurities floating on the water surface, fishing out the residual materials, and placing at the temperature of 20 ℃ for maintenance for 1 d;
(5) and (3) drying: pouring the residual material obtained in the step (4) into a dryer, and drying for 2 hours at 100 ℃;
(6) mixing: pouring the residual material obtained in the step (5) into a stirrer, adding the fly ash and the high-efficiency water reducing agent, and stirring for 30 minutes;
(7) grinding: pouring the residual material obtained in the step (6) into a spherical grinder, and grinding fine powder;
(8) and (3) screening for the second time: putting the fine powder obtained in the step (7) into a screening device for screening, and screening out recycled aggregate with the particle size of 1-5 mm;
(9) packaging: and (4) putting the recycled aggregate obtained in the step (8) into a winnowing device, removing the light drifts through wind power, and then packaging through a packaging device.
Example two
A production process for preparing recycled aggregate from building construction residues comprises the following steps:
(1) collecting construction residues: stacking waste concrete in a building dismantled in the building construction process and defective concrete caused by misoperation in the construction process on an empty site, and performing epidemic prevention treatment on the waste concrete and the defective concrete;
(2) crushing and first screening: sorting out large steel bars and wood chips stacked in the building residue on the site, and crushing by using a crushing device;
(3) magnetic separation: pouring the residual material in the step (2) into a magnetic separator to remove fine metal impurities;
(4) and (3) settling: pouring the residual materials obtained in the step (3) into a settling pond, soaking for 1d, stirring for 10 minutes every 3 hours, keeping still for 4 hours, fishing out impurities floating on the water surface, fishing out the residual materials, and maintaining for 2d at the temperature of 25 ℃;
(5) and (3) drying: pouring the residual material obtained in the step (4) into a dryer, and drying for 3 hours at 110 ℃;
(6) mixing: pouring the residual material obtained in the step (5) into a stirrer, adding the fly ash and the high-efficiency water reducing agent, and stirring for 45 minutes;
(7) grinding: pouring the residual material obtained in the step (6) into a spherical grinder, and grinding fine powder;
(8) and (3) screening for the second time: putting the fine powder obtained in the step (7) into a screening device for screening, and screening out recycled aggregate with the particle size of 1-5 mm;
(9) packaging: and (4) putting the recycled aggregate obtained in the step (8) into a winnowing device, removing the light drifts through wind power, and then packaging through a packaging device.
EXAMPLE III
A production process for preparing recycled aggregate from building construction residues comprises the following steps:
(1) collecting construction residues: stacking waste concrete in a building dismantled in the building construction process and defective concrete caused by misoperation in the construction process on an empty site, and performing epidemic prevention treatment on the waste concrete and the defective concrete;
(2) crushing and first screening: sorting out large steel bars and wood chips stacked in the building residue on the site, and crushing by using a crushing device;
(3) magnetic separation: pouring the residual material in the step (2) into a magnetic separator to remove fine metal impurities;
(4) and (3) settling: pouring the residual materials obtained in the step (3) into a settling pond, soaking for 1d, stirring for 10 minutes every 3 hours, keeping static for 5 hours, fishing out impurities floating on the water surface, fishing out the residual materials, and maintaining for 3d at the temperature of 30 ℃;
(5) and (3) drying: pouring the residual material obtained in the step (4) into a dryer, and drying for 4 hours at 120 ℃;
(6) mixing: pouring the residual material obtained in the step (5) into a stirrer, adding the fly ash and the high-efficiency water reducing agent, and stirring for 60 minutes;
(7) grinding: pouring the residual material obtained in the step (6) into a spherical grinder, and grinding fine powder;
(8) and (3) screening for the second time: putting the fine powder obtained in the step (7) into a screening device for screening, and screening out recycled aggregate with the particle size of 1-5 mm;
(9) packaging: and (4) putting the recycled aggregate obtained in the step (8) into a winnowing device, removing the light drifts through wind power, and then packaging through a packaging device.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A production process for preparing recycled aggregate from building construction residues is characterized by comprising the following steps: the method comprises the following steps:
(1) collecting construction residues: stacking waste concrete in a building dismantled in the building construction process and defective concrete caused by misoperation in the construction process on an empty site, and performing epidemic prevention treatment on the waste concrete and the defective concrete;
(2) crushing and first screening: sorting out large steel bars and wood chips stacked in the building residue on the site, and crushing by using a crushing device;
(3) magnetic separation: pouring the residual material in the step (2) into a magnetic separator to remove fine metal impurities;
(4) and (3) settling: pouring the residual materials obtained in the step (3) into a settling pond, soaking for 1d, stirring for 10 minutes every 3 hours, keeping still for 3-5 hours, fishing out impurities floating on the water surface, fishing out the residual materials, and maintaining for 1-3d at the temperature of 20-30 ℃;
(5) and (3) drying: pouring the residual material obtained in the step (4) into a dryer, and drying for 2-4 hours at the temperature of 100-;
(6) mixing: pouring the residual material obtained in the step (5) into a stirrer, adding the fly ash and the high-efficiency water reducing agent, and stirring for 30-60 minutes;
(7) grinding: pouring the residual material obtained in the step (6) into a spherical grinder, and grinding fine powder;
(8) and (3) screening for the second time: putting the fine powder obtained in the step (7) into a screening device for screening, and screening out recycled aggregate with the particle size of 1-5 mm;
(9) packaging: and (4) putting the recycled aggregate obtained in the step (8) into a winnowing device, removing the light drifts through wind power, and then packaging through a packaging device.
2. The production process for preparing recycled aggregate from building construction residues according to claim 1, which is characterized in that: the crushing device is a double-rotor hammer crusher.
3. The production process for preparing recycled aggregate from building construction residues according to claim 1, which is characterized in that: the metal impurities include broken steel bars and iron nails.
4. The production process for preparing recycled aggregate from building construction residues according to claim 1, which is characterized in that: the impurities in the step (4) comprise low-density plastics, wood, grass roots and barks.
5. The production process for preparing recycled aggregate from building construction residues according to claim 1, which is characterized in that: the screening device is a screen frame vibration type electric screen.
6. The production process for preparing recycled aggregate from building construction residues according to claim 1, which is characterized in that: the winnowing device further comprises a dust removal device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010213246.2A CN111299303A (en) | 2020-03-24 | 2020-03-24 | Production process for preparing recycled aggregate from building construction residual materials |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010213246.2A CN111299303A (en) | 2020-03-24 | 2020-03-24 | Production process for preparing recycled aggregate from building construction residual materials |
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| CN111299303A true CN111299303A (en) | 2020-06-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114471902A (en) * | 2022-01-14 | 2022-05-13 | 重庆渝之源建设工程有限公司 | Production process for preparing recycled aggregate from building construction residual materials |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114471902A (en) * | 2022-01-14 | 2022-05-13 | 重庆渝之源建设工程有限公司 | Production process for preparing recycled aggregate from building construction residual materials |
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