CN113461351A - Method for treating construction waste - Google Patents
Method for treating construction waste Download PDFInfo
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- CN113461351A CN113461351A CN202111029506.1A CN202111029506A CN113461351A CN 113461351 A CN113461351 A CN 113461351A CN 202111029506 A CN202111029506 A CN 202111029506A CN 113461351 A CN113461351 A CN 113461351A
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000002699 waste material Substances 0.000 title claims abstract description 30
- 238000010276 construction Methods 0.000 title claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 145
- 239000002245 particle Substances 0.000 claims abstract description 122
- 239000012535 impurity Substances 0.000 claims abstract description 61
- 239000011449 brick Substances 0.000 claims abstract description 51
- 238000012216 screening Methods 0.000 claims abstract description 47
- 239000010813 municipal solid waste Substances 0.000 claims abstract description 40
- 239000000203 mixture Substances 0.000 claims description 40
- 238000007885 magnetic separation Methods 0.000 claims description 18
- 238000000926 separation method Methods 0.000 claims description 9
- 239000002689 soil Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 abstract description 20
- 238000012545 processing Methods 0.000 abstract description 9
- 238000011282 treatment Methods 0.000 description 40
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- -1 sundries Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012372 quality testing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
-
- 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
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- 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
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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
- Y02W30/58—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
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Food Science & Technology (AREA)
- Civil Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a method for treating construction waste, which comprises the following steps: (1) screening the garbage raw materials to obtain a primary raw material, a secondary raw material and a tertiary raw material with the particle size from large to small; (2) crushing, removing impurities, screening and sorting the primary raw materials to obtain primary brick aggregate and primary concrete aggregate; (3) screening, impurity removal and sorting the secondary raw materials to obtain secondary brick aggregate and secondary concrete aggregate; (4) and (3) screening and removing impurities of the tertiary raw materials obtained by screening in the step (2) and the step (3) and the tertiary raw materials obtained in the step (1) together to obtain tertiary fine aggregate and quaternary fine aggregate. The method improves the crushing efficiency and the processing capacity of the toothed roller crusher, obviously improves the integral hour processing capacity of a processing line, obtains high-quality concrete aggregate, solves the problem that a large amount of sundries, bricks and other materials seriously wrap the concrete material, greatly improves the processing efficiency and simultaneously can obviously reduce the processing cost.
Description
Technical Field
The invention relates to the field of environmental protection, in particular to a method for treating construction waste.
Background
The loading link of the processing technology of the demolished building rubbish (also called demolishing rubbish) generally adopts an excavator to transport the raw materials to a feeding chain plate machine for sorting, but the ingredients of the rubbish raw materials are many and complex, in order to realize the operation of pre-sorting impurity removal of workers on the feeding chain plate machine, the rubbish raw materials need to be spread out and spread on the chain plate machine as uniformly as possible, but during the actual operation on site, the phenomena of material concentration accumulation and deviation to one side of the chain plate machine often occur, which not only influences the sorting of the rubbish, but also reduces the working efficiency, and the small treatment capacity of a treatment line is difficult to realize large promotion, and light impurities cannot be selected out when the sorting is also caused.
At present, most of demolish rubbish disposal technologies are when the pan feeding, can generally throw into the tooth roller breaker with the raw materials below 600mm and break in whole, but tooth roller breaker is broken the rubbish raw materials to within 150mm, consequently, the former a large amount of raw materials that are less than 150mm of rubbish raw materials get into the tooth roller breaker and also can not further be broken, become invalid broken material, greatly reduced crushing efficiency, reduced tooth roller breaker's throughput, can't improve the holistic hour throughput of processing line.
In addition, the existing garbage removal disposal process can mix bricks with concrete aggregates after impurities are removed together for crushing, screening and impurity removal, so that a large amount of brick aggregates are mixed in a finally obtained concrete aggregate product, the quality of the concrete aggregates is reduced, the concrete aggregates are mostly used in the production of recycled cement products such as brick making lines, water stabilizing lines and the like, when a large amount of brick aggregates are contained in the concrete aggregates, the indexes such as the strength, the appearance and the like of the concrete aggregates can be seriously influenced, and the produced products can also have the problem of unqualified quality. In addition, as the raw materials are more and complex in components, the wrapping phenomenon of materials such as bricks and concrete is serious due to a large amount of impurities, the processes such as screening and impurity removal are further influenced, the surplus coefficient of the rated processing capacity of the treatment line equipment has to be enlarged when the treatment line equipment is selected, the treatment line equipment is large in type selection, the phenomenon of 'big horse pulls a trolley' exists, and the treatment cost is increased.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a method for treating construction waste, in particular to a method for treating demolished construction waste. The method divides the garbage raw materials into three grades of raw materials with different particle sizes by screening, and then carries out different treatments on the raw materials at each grade respectively, so that the situation that a large amount of raw materials smaller than 150mm in the garbage raw materials become ineffective crushed materials is avoided, the crushing efficiency and the treatment capacity of a toothed roller type crusher are improved, the integral hour treatment capacity of a treatment line is obviously improved, impurities are effectively removed, the concrete aggregate and the brick aggregate are effectively and completely separated, the brick aggregate is separated, high-quality concrete aggregate is obtained, the indexes such as strength and appearance of the concrete aggregate are improved, and the problem that the quality of products produced by taking the concrete aggregate as the raw material does not reach the standard is solved. The invention also solves the problem of serious wrapping phenomenon of a large amount of materials such as sundries, bricks and the like and concrete materials, can better screen and remove impurities, greatly improves the treatment efficiency and simultaneously can obviously reduce the treatment cost.
The invention is realized by the following steps:
a method for treating construction waste comprises the following steps:
(1) screening the garbage raw materials to obtain a primary raw material, a secondary raw material and a tertiary raw material with the particle size from large to small;
(2) crushing, removing impurities and screening the primary raw materials in the step (1) to obtain tertiary raw materials and primary brick-concrete mixture aggregates, merging the screened tertiary raw materials into the tertiary raw materials in the step (1), and sorting the primary brick-concrete mixture aggregates without the tertiary raw materials to obtain primary brick aggregates and primary concrete aggregates; the two aggregates obtained in the step have the highest purity, can be directly recycled or sold, and can also be recycled after being crushed into fine aggregates;
(3) screening the secondary raw materials in the step (1) to obtain tertiary raw materials and secondary brick-concrete mixture aggregates, merging the screened tertiary raw materials into the tertiary raw materials in the step (1), and removing impurities and sorting the secondary brick-concrete mixture aggregates from which the tertiary raw materials are removed to obtain secondary brick aggregates and secondary concrete aggregates; the two kinds of aggregates obtained in the step have higher purity, can be directly recycled or sold, and can also be recycled after being crushed into fine aggregates. If necessary, the first-grade brick aggregate and the first-grade concrete aggregate obtained in the step (2) can be respectively mixed and recycled;
(4) and (3) removing impurities from the tertiary raw materials obtained by screening in the steps (2) and (3) and the tertiary raw materials obtained by screening in the step (1) and screening to obtain reduced soil, tertiary aggregate and quaternary aggregate, and removing impurities from the tertiary aggregate and the quaternary aggregate respectively to obtain tertiary fine aggregate and quaternary fine aggregate. The tertiary fine aggregate and the quaternary fine aggregate obtained in the step can be recycled.
The method of the invention firstly divides the garbage raw materials into three grades of raw materials with different grain diameters by screening, and then respectively carries out different treatments on the raw materials at each grade, thereby avoiding that a large amount of raw materials smaller than 150mm in the garbage raw materials become ineffective crushed materials, improving the crushing efficiency and the treatment capacity of a toothed roller type crusher, obviously improving the integral hour treatment capacity of a treatment line, effectively removing impurities, effectively and completely separating concrete aggregate and brick aggregate, sorting the brick aggregate, obtaining high-quality concrete aggregate, improving the indexes of the concrete aggregate such as strength and appearance, and solving the problem that the quality of products produced by taking the concrete aggregate as the raw material does not reach the standard. The invention also solves the problem of serious wrapping phenomenon of a large amount of materials such as sundries, bricks and the like and concrete materials, can better screen and remove impurities, greatly improves the treatment efficiency and simultaneously can obviously reduce the treatment cost.
In the step (1), the particle size of the primary raw material is 80.1-600 mm;
preferably, the particle size of the secondary raw material is 31.6-80 mm;
preferably, the particle size of the tertiary raw material is 0.1-31.5 mm.
The garbage raw materials are divided into three grades of raw materials with different particle sizes, and the materials are sorted and purified according to the properties of the raw materials of each grade, so that the method is a more advanced and refined sorting process, the treatment efficiency is improved, and the high-quality concrete aggregate can be obtained.
Before the step (1), the method also comprises the steps of pre-sorting and removing the garbage raw materials with the particle size of more than 600 mm.
In the step (2), the impurity removal mode comprises magnetic separation and manual separation; iron metal can be removed through magnetic separation, and various impurities can be removed through manual separation;
preferably, the sorting equipment in the step (2) and the step (3) is a brick concrete sorting machine.
In the step (2), the particle size of the crushed primary raw material is 0.1-150 mm. Raw materials of 80.1-600 mm are firstly crushed to 0.1-150 mm, then large-size impurities in the materials are removed by manual selection, and the efficiency is higher.
In the step (2), the particle size of the first-grade brick-concrete mixture aggregate is 31.6-150 mm;
preferably, the particle size of the primary brick aggregate is 31.6-150 mm;
preferably, the particle size of the primary concrete aggregate is 31.6-150 mm.
In the step (3), the grain diameter of the second-level brick-concrete mixture aggregate is 31.6-80 mm;
preferably, the particle size of the secondary brick aggregate is 31.6-80 mm;
preferably, the grain diameter of the secondary concrete aggregate is 31.6-80 mm.
In the step (3), the impurity removal mode comprises dry roughing and magnetic separation. The particle size of the raw material of 31.6-80 mm and the included impurities is small, and the impurity removal is carried out by adopting dry roughing, so that the efficiency is higher; removing iron metals by magnetic separation.
Preferably, dry roughing is performed by using dry roughing equipment.
In the step (4), the impurity removal mode is magnetic separation or dry concentration. The particle sizes of the raw materials with the particle sizes of 0-31.5 mm and the impurities contained in the raw materials are smaller, and the impurity removal efficiency is higher by adopting dry concentration; removing iron metals by magnetic separation.
Preferably, dry beneficiation is performed using a dry beneficiation plant.
In the step (4), the particle size of the tertiary aggregate is 10.1-31.5 mm; the particle size of the four-grade aggregate is 5.1-10 mm;
preferably, the particle size of the reducing soil is 0-5 mm;
preferably, the particle size of the tertiary fine aggregate is 10.1-31.5 mm; the particle size of the four-grade fine aggregate is 5.1-10 mm.
A method for treating construction waste specifically comprises the following steps:
(1) pre-sorting the garbage raw materials, removing the garbage raw materials with the particle size of more than 600mm, feeding the garbage raw materials with the particle size of less than or equal to 600mm into a chain plate feeder through an excavator for transferring, and screening in a drum screen to obtain a primary raw material with the particle size of 80.1-600 mm, a secondary raw material with the particle size of 31.6-80 mm and a tertiary raw material with the particle size of 0.1-31.5 mm;
(2) crushing the primary raw material with the particle size of 80.1-600 mm in the step (1) by using a toothed roller crusher to the particle size of 0.1-150 mm, removing iron metal through magnetic separation after crushing, removing various impurities through manual sorting, screening by using a drum screen again after removing impurities to obtain a tertiary raw material with the particle size of 0.1-31.5 mm and a primary brick-concrete mixture aggregate with the particle size of 31.6-150 mm, merging the tertiary raw material with the particle size of 0.1-31.5 mm obtained through screening into the tertiary raw material in the step (1), and sorting the primary brick-concrete mixture aggregate with the particle size of 31.6-150 mm after removing the tertiary raw material by using a brick sorter to obtain the primary brick aggregate with the particle size of 31.6-150 mm and the primary concrete aggregate with the particle size of 31.6-150 mm;
(3) screening the secondary raw materials with the particle size of 31.6-80 mm in the step (1) by using a drum screen to obtain a tertiary raw material with the particle size of 0.1-31.5 mm and a secondary brick-concrete mixture aggregate with the particle size of 31.6-80 mm, merging the tertiary raw materials with the particle size of 0.1-31.5 mm obtained by screening into the tertiary raw materials in the step (1), carrying out dry roughing on the secondary brick-concrete mixture aggregate with the particle size of 31.6-80 mm after the tertiary raw materials are removed by using dry roughing equipment to remove impurities, removing iron metal impurities by magnetic separation, and carrying out sorting by using a brick-concrete sorting machine after the impurities are removed to obtain the secondary brick-concrete aggregate with the particle size of 31.6-80 mm and the secondary concrete aggregate with the particle size of 31.6-80 mm;
(4) combining the tertiary raw materials obtained by screening in the step (2) and the step (3) with the tertiary raw materials obtained by screening in the step (1), removing iron metal impurities through magnetic separation, screening through a drum screen to obtain reduced soil with the particle size of 0-5 mm, tertiary aggregate with the particle size of 10.1-31.5 mm and quaternary aggregate with the particle size of 5.1-10 mm, and performing air separation and impurity removal on the tertiary aggregate and the quaternary aggregate through dry concentration to obtain tertiary fine aggregate with the particle size of 10.1-31.5 mm and quaternary fine aggregate with the particle size of 5.1-10 mm.
The invention has the following beneficial effects:
(1) the method of the invention firstly divides the garbage raw materials into three grades of raw materials with different grain diameters by screening, and then respectively carries out different treatments on the raw materials at each grade, thereby avoiding that a large amount of raw materials smaller than 150mm in the garbage raw materials become ineffective crushed materials, improving the crushing efficiency and the treatment capacity of a toothed roller type crusher, obviously improving the integral hour treatment capacity of a treatment line, effectively removing impurities, effectively and completely separating concrete aggregate and brick aggregate, sorting the brick aggregate, obtaining high-quality concrete aggregate, improving the indexes of the concrete aggregate such as strength and appearance, and solving the problem that the quality of products produced by taking the concrete aggregate as the raw material does not reach the standard. The invention also solves the problem of serious wrapping phenomenon of a large amount of materials such as sundries, bricks and the like and concrete materials, can better screen and remove impurities, greatly improves the treatment efficiency and simultaneously can obviously reduce the treatment cost.
(2) The method comprises the steps of screening the garbage raw materials before crushing, dividing the garbage raw materials into three grades of raw materials with different particle sizes, only crushing the garbage with a large particle size of 80.1-600 mm, crushing the garbage with a large particle size to 0.1-150 mm in one hundred percent, and obtaining a first-grade brick-concrete mixture aggregate with a particle size of 31.6-150 mm and a third-grade raw material with a particle size of 0-31.5 mm by screening again after impurity removal, wherein the third-grade raw material with a small particle size is combined to the third-grade raw material for treatment, and then is sorted by a brick-concrete sorting machine to separate the first-grade brick-concrete mixture aggregate, so that the concrete aggregate with higher purity and the brick aggregate can be obtained.
(3) The invention adopts the brick-concrete separator to separate the aggregate of the brick-concrete mixture, has higher separation efficiency and stronger processing capacity, and has better quality of the concrete aggregate product after removing the brick aggregate.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a process flow diagram of a method for treating construction waste according to embodiment 1 of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The brick concrete separator adopted by the invention is ZTL-200, and the concrete separator is carried out according to the conventional conditions or the conditions suggested by the manufacturer if the concrete conditions are not noted in the embodiment. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
Example 1
A method for treating construction waste, as shown in fig. 1, specifically comprising the following steps:
(1) pre-sorting the garbage raw materials, removing the garbage raw materials with the particle size of more than 600mm, feeding the garbage raw materials with the particle size of less than or equal to 600mm into a chain plate feeder through an excavator for transferring, and screening in a drum screen to obtain a primary raw material with the particle size of 80.1-600 mm, a secondary raw material with the particle size of 31.6-80 mm and a tertiary raw material with the particle size of 0.1-31.5 mm;
(2) crushing the primary raw material with the particle size of 80.1-600 mm in the step (1) by using a toothed roller crusher to the particle size of 0.1-150 mm, removing iron metal through magnetic separation after crushing, removing various impurities through manual sorting, screening by using a drum screen again after removing impurities to obtain a tertiary raw material with the particle size of 0.1-31.5 mm and a primary brick-concrete mixture aggregate with the particle size of 31.6-150 mm, merging the tertiary raw material with the particle size of 0.1-31.5 mm obtained through screening into the tertiary raw material in the step (1), and sorting the primary brick-concrete mixture aggregate with the particle size of 31.6-150 mm after removing the tertiary raw material by using a brick sorter to obtain the primary brick aggregate with the particle size of 31.6-150 mm and the primary concrete aggregate with the particle size of 31.6-150 mm;
(3) screening the secondary raw materials with the particle size of 31.6-80 mm in the step (1) by using a drum screen to obtain a tertiary raw material with the particle size of 0.1-31.5 mm and a secondary brick-concrete mixture aggregate with the particle size of 31.6-80 mm, merging the tertiary raw materials with the particle size of 0.1-31.5 mm obtained by screening into the tertiary raw materials in the step (1), carrying out dry roughing on the secondary brick-concrete mixture aggregate with the particle size of 31.6-80 mm after the tertiary raw materials are removed by using dry roughing equipment to remove impurities, removing iron metal impurities by magnetic separation, and carrying out sorting by using a brick-concrete sorting machine after the impurities are removed to obtain the secondary brick-concrete aggregate with the particle size of 31.6-80 mm and the secondary concrete aggregate with the particle size of 31.6-80 mm;
(4) combining the tertiary raw materials obtained by screening in the step (2) and the step (3) with the tertiary raw materials obtained by screening in the step (1), removing iron metal impurities through magnetic separation, screening through a drum screen to obtain reduced soil with the particle size of 0-5 mm, tertiary aggregate with the particle size of 10.1-31.5 mm and quaternary aggregate with the particle size of 5.1-10 mm, and performing air separation and impurity removal on the tertiary aggregate and the quaternary aggregate through dry concentration to obtain tertiary fine aggregate with the particle size of 10.1-31.5 mm and quaternary fine aggregate with the particle size of 5.1-10 mm.
Comparative example 1
A treatment process for removing garbage comprises the following steps:
(1) pre-sorting garbage raw materials, removing the garbage raw materials with the particle size of more than 600mm, feeding the garbage raw materials with the particle size of less than or equal to 600mm into a chain plate feeder through an excavator for transferring, firstly feeding the garbage raw materials into a toothed roller type crusher for crushing to 0.1-150 mm, and then feeding the garbage raw materials into a drum screen for screening to obtain three raw materials with the particle sizes of 100.1-150 mm, 31.6-100 mm and 0.1-31.5 mm respectively;
(2) removing iron metal from the raw material with the particle size of 100.1-150 mm in the step (1) through magnetic separation, and removing various impurities through manual separation to obtain brick-concrete mixture aggregate with the particle size of 100.1-150 mm;
(3) screening the raw materials with the particle size of 31.6-100 mm in the step (1) by using a circular vibrating screen to obtain raw materials with the particle size of 0.1-31.5 mm and brick concrete mixture aggregates with the particle size of 31.6-100 mm, merging the raw materials with the particle size of 0.1-31.5 mm obtained by screening into the raw materials with the particle size of 0.1-31.5 mm in the step (1), carrying out dry roughing on the brick concrete mixture aggregates with the particle size of 31.6-100 mm by using dry roughing equipment to remove impurities, removing iron metal impurities by magnetic separation, and carrying out manual inspection sorting after removing the impurities to obtain the brick concrete mixture aggregates with the particle size of 31.6-100 mm;
(4) combining the brick-concrete mixture aggregate with the particle size of 100.1-150 mm obtained after the impurities are removed in the step (2) and the step (3) with the particle size of 31.6-100 mm, and then crushing the mixture aggregate in a hammer crusher to obtain the brick-concrete mixture aggregate with the particle size of 0.1-31.5 mm;
(5) combining the raw materials with the particle size of 0.1-31.5 mm obtained by screening in the step (3) and the raw materials with the particle size of 0.1-31.5 mm obtained by crushing in the step (4), removing iron metal impurities by magnetic separation together with the raw materials with the particle size of 0.1-31.5 mm in the step (1), screening by a relaxation screen to obtain reduced soil with the particle size of 0-5 mm, brick concrete mixture aggregates with the particle size of 10.1-31.5 mm and brick concrete mixture aggregates with the particle size of 5.1-10 mm, and performing dry selection and air separation on the two kinds of the concrete mixture aggregates with the particle size to remove impurities, so as to obtain brick concrete mixture fine aggregates with the particle size of 10.1-31.5 mm and brick concrete mixture fine aggregates with the particle size of 5.1-10 mm.
The comparative example is the existing treatment process for removing the garbage, and only the fine aggregate of the brick-concrete mixture can be obtained, but purer concrete aggregate cannot be obtained.
Example 2
The quality test was carried out on the mixture of the primary concrete aggregate and the primary brick aggregate with the particle size of 31.6-150 mm obtained in example 1, the secondary concrete aggregate and the secondary brick aggregate with the particle size of 31.6-80 mm obtained in example 1, and the fine aggregate of the brick-concrete mixture with the particle size of 5.1-10 mm and the particle size of 10.1-31.5 mm obtained in comparative example 1. The test method is carried out according to the method specified in GB/T14685 and GB/T25177-2010, and the test results are shown in Table 1:
table 1 product quality testing table
As can be seen from Table 1, the quality of the concrete aggregate obtained by the treatment method of the invention is higher and is significantly better than that of the fine aggregate of the brick-concrete mixture obtained by the treatment method of the comparative example 1. The treatment process for removing the garbage in the comparative example 1 can not realize the separation of the brick aggregate in the concrete aggregate, and only the brick-concrete mixed aggregate can be obtained, and the properties of the concrete aggregate such as purity, strength and the like are obviously influenced by the mixing of the brick aggregate in the concrete aggregate. The treatment method of the invention effectively removes impurities, effectively and completely separates the concrete aggregate and the brick aggregate to obtain high-quality concrete aggregate, improves the indexes of the concrete aggregate such as strength, appearance and the like, and solves the problem that the quality of products produced by taking the concrete aggregate as a raw material does not reach the standard. The invention also solves the problem that the wrapping phenomenon of materials such as bricks, concrete and the like is serious due to a large amount of sundries, can better perform screening and impurity removal, and greatly improves the treatment efficiency and the treatment cost.
In conclusion, the method of the invention firstly divides the garbage raw materials into three grades of raw materials with different particle sizes by screening, and then respectively carries out different treatments on the raw materials at each grade, thereby avoiding that a large amount of raw materials smaller than 150mm in the garbage raw materials become ineffective crushed materials, improving the crushing efficiency and the treatment capacity of the toothed roller crusher, obviously improving the integral hour treatment capacity of a treatment line, effectively removing impurities, effectively and completely separating concrete aggregate and brick aggregate, sorting the brick aggregate to obtain high-quality concrete aggregate, improving the indexes of the concrete aggregate such as strength and appearance, and solving the problem that the quality of products produced by taking the concrete aggregate as the raw material does not reach the standard. The invention also solves the problem of serious wrapping phenomenon of a large amount of materials such as sundries, bricks and the like and concrete materials, can better screen and remove impurities, greatly improves the treatment efficiency and simultaneously can obviously reduce the treatment cost.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (19)
1. A method for treating construction waste is characterized by comprising the following steps:
(1) screening the garbage raw materials to obtain a primary raw material, a secondary raw material and a tertiary raw material with the particle size from large to small;
(2) crushing, removing impurities and screening the primary raw materials in the step (1) to obtain tertiary raw materials and primary brick-concrete mixture aggregates, merging the screened tertiary raw materials into the tertiary raw materials in the step (1), and sorting the primary brick-concrete mixture aggregates without the tertiary raw materials to obtain primary brick aggregates and primary concrete aggregates;
(3) screening the secondary raw materials in the step (1) to obtain tertiary raw materials and secondary brick-concrete mixture aggregates, merging the screened tertiary raw materials into the tertiary raw materials in the step (1), and removing impurities and sorting the secondary brick-concrete mixture aggregates from which the tertiary raw materials are removed to obtain secondary brick aggregates and secondary concrete aggregates;
(4) and (3) removing impurities from the tertiary raw materials obtained by screening in the steps (2) and (3) and the tertiary raw materials obtained by screening in the step (1) and screening to obtain reduced soil, tertiary aggregate and quaternary aggregate, and removing impurities from the tertiary aggregate and the quaternary aggregate respectively to obtain tertiary fine aggregate and quaternary fine aggregate.
2. The method for treating construction waste according to claim 1, wherein in the step (1), the primary raw material has a particle size of 80.1 to 600 mm.
3. The method for treating construction waste according to claim 1, wherein in the step (1), the secondary raw material has a particle size of 31.6 to 80 mm.
4. The method for treating construction waste according to claim 1, wherein in the step (1), the particle size of the tertiary raw material is 0.1 to 31.5 mm.
5. The method for treating construction waste according to claim 1, further comprising the step of pre-sorting and removing waste materials with a particle size of more than 600mm before the step (1).
6. The method for treating the construction waste, according to claim 1, wherein in the step (2), the impurity removing manner comprises magnetic separation and manual separation.
7. The method for treating construction waste according to claim 1, wherein the sorting equipment in the steps (2) and (3) is a brick concrete sorting machine.
8. The method for treating construction waste according to claim 1, wherein in the step (2), the particle size of the crushed primary raw material is 0.1 to 150 mm.
9. The method for treating the construction waste as claimed in claim 1, wherein in the step (2), the particle size of the primary brick-concrete mixture aggregate is 31.6-150 mm.
10. The method for treating construction waste according to claim 1, wherein in the step (2), the primary brick aggregate has a particle size of 31.6 to 150 mm.
11. The method for treating the construction waste according to claim 1, wherein in the step (2), the particle size of the primary concrete aggregate is 31.6 to 150 mm.
12. The method for treating the construction waste as claimed in claim 1, wherein in the step (3), the particle size of the secondary brick-concrete mixture aggregate is 31.6-80 mm.
13. The method for treating construction waste according to claim 1, wherein in the step (3), the secondary brick aggregate has a particle size of 31.6 to 80 mm.
14. The method for treating the construction waste according to claim 1, wherein in the step (3), the grain size of the secondary concrete aggregate is 31.6-80 mm.
15. The method for treating the construction waste as claimed in claim 1, wherein in the step (3), the impurity removal mode comprises dry roughing and magnetic separation.
16. The method for treating construction waste according to claim 1, wherein in the step (4), the impurity removal mode is magnetic separation or dry concentration.
17. The method for treating construction waste according to claim 1, wherein in the step (4), the particle size of the tertiary aggregate is 10.1 to 31.5 mm; the particle size of the four-grade aggregate is 5.1-10 mm.
18. The method for treating construction waste according to claim 1, wherein in the step (4), the particle size of the reduced soil is 0 to 5 mm.
19. The method for treating construction waste according to claim 1, wherein in the step (4), the particle size of the tertiary fine aggregate is 10.1 to 31.5 mm; the particle size of the four-grade fine aggregate is 5.1-10 mm.
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