CN118184202B - Method for preparing continuous size fraction recycled aggregate based on lateral confining pressure-vertical loading - Google Patents
Method for preparing continuous size fraction recycled aggregate based on lateral confining pressure-vertical loadingInfo
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- CN118184202B CN118184202B CN202410413240.8A CN202410413240A CN118184202B CN 118184202 B CN118184202 B CN 118184202B CN 202410413240 A CN202410413240 A CN 202410413240A CN 118184202 B CN118184202 B CN 118184202B
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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
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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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
- Y02W30/50—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)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
本发明涉及建筑固废资源化领域，公开了一种基于侧向围压‑竖向加载制备连续粒级再生骨料的方法。该方法包括：（1）收集砼固废原料；（2）对所述砼固废原料进行预处理，得到处理后的砼固废原料；（3）将所述处理后的砼固废原料送入侧向围压‑竖向加载破碎装置进行压碎处理，得到再生混合料I。本发明提供的方法能够在高生产效率、低能源消耗的前提下，阶段性获取连续粒级再生骨料，包含再生粗骨料、再生细骨料和再生微粉；且侧向围压‑竖向加载破碎不同于传统的击打或撞击破碎，不产生噪声污染；并且能够在全封闭状态进行，大幅度降低了粉尘污染；以及能够全面满足实际工程配合比设计对连续粒级再生骨料多样化的级配需求。
The present invention relates to the field of construction solid waste resource utilization, and discloses a method for preparing continuously sized recycled aggregates based on lateral confining pressure and vertical loading. The method comprises: (1) collecting concrete solid waste raw materials; (2) pre-treating the concrete solid waste raw materials to obtain treated concrete solid waste raw materials; (3) feeding the treated concrete solid waste raw materials into a lateral confining pressure and vertical loading crushing device for crushing to obtain a recycled mixture I. The method provided by the present invention can obtain continuously sized recycled aggregates in stages under the premise of high production efficiency and low energy consumption, including recycled coarse aggregates, recycled fine aggregates and recycled fine powders; and the lateral confining pressure and vertical loading crushing is different from traditional striking or impact crushing and does not generate noise pollution; and can be carried out in a fully enclosed state, which greatly reduces dust pollution; and can fully meet the diversified grading requirements of the continuous sized recycled aggregates in the actual engineering mix design.
Description
Technical Field
The invention relates to the field of building solid waste recycling, in particular to a method for preparing continuous size fraction recycled aggregate based on lateral confining pressure-vertical loading.
Background
The civil engineering continuously generates a large amount of concrete waste (hereinafter referred to as concrete solid waste) in the process of construction, maintenance and disassembly and modification. In recent years, the amount of deposited concrete solid wastes has been increasing, and in order to solve a series of environmental problems caused by the rapid increase of concrete solid wastes, it has been strongly demanded to regenerate and utilize the concrete solid wastes.
At present, a certain technical accumulation and technological progress exist for recycling concrete solid wastes. The conventional scheme is that the concrete solid waste is firstly subjected to sorting, cleaning, crushing and screening to prepare building coarse aggregate, fine aggregate and recycled micro powder, and the building coarse aggregate, the fine aggregate and the recycled micro powder are used for preparing green building material products such as recycled concrete or baking-free bricks.
CN113117857a discloses an intelligent crushing integrated system for continuous grading recycled aggregate. The system is sequentially provided with a feeding device, a primary crushing device, a screening device, a first transmission device, a secondary crushing device and a second transmission device along the aggregate crushing feeding direction. The method can obtain the continuous grading recycled aggregate through repeated striking or impact crushing, has complex production process and easy noise pollution in the crushing process, and coarse and fine aggregates are mixed together according to specific grading for production and use, so that the method cannot meet the grading application requirements of actual engineering diversified aggregates.
CN116444218a discloses a fully regenerated concrete, its preparation method and application. The method comprises the steps of sequentially crushing and deironing recycled building materials, and carrying out secondary screening to obtain coarse aggregate, fine aggregate and incompletely crushed aggregate particles, wherein the particle size of the coarse aggregate is more than 4.75mm and less than or equal to 8.25mm, and the particle size of the fine aggregate is less than 4.75mm. The coarse aggregate and the fine aggregate prepared by the method have no size fraction distinction, can not meet the application requirements of actual concrete engineering mix proportion design on aggregates with different size fractions, and generate noise pollution in the crushing process.
CN103332881a discloses a method for preparing high quality recycled concrete aggregate. The method comprises the steps of sequentially sorting, hammering, first-stage crushing, first-stage screening, rod grinding, second-stage screening and cleaning waste concrete, and mixing the graded aggregate according to the required grading to obtain the recycled coarse aggregate with different particle size requirements. The technological process for producing the recycled aggregate with different particle sizes by the method covers 7 steps, and noise pollution is large in the hammering, crushing and rod grinding processes.
CN117563766a discloses a method and a device for sorting construction waste. The method adopts a jaw crushing device, an impact crushing device, screening equipment, magnetic attraction sorting equipment, winnowing impurity removing equipment and other matched machinery. The method can obtain the recycled aggregate with different particle sizes through secondary crushing, four-stage separation and multiple impurity removal, and noise pollution in jaw and impact crushing processes is large.
Publication No. US202217934473a discloses a method for preparing recycled concrete. The method adjusts the running state of the crusher through a control signal of a control system, and crushes the concrete solid waste into recycled aggregate with specific size and geometric shape. The method can only obtain recycled aggregate with one size fraction in one production process, and noise pollution is easy to generate in the process of crushing concrete solid waste into recycled aggregate with specific size and geometric shape.
The publication No. KR20220048400a discloses an apparatus for manufacturing recycled aggregate for concrete, which includes an aggregate supply unit that supplies a chute shape, a crushing crack inducing unit, a compression crushing unit, a cyclone collecting unit, and a screen unit. The equipment produces the recycled aggregate through the crushing crack inducing unit and the compression crushing unit, has complex production process, can only obtain one grade of recycled aggregate at a time, and is easy to produce noise pollution.
The publication number KR20210009547a discloses a recycled aggregate production system and a recycled aggregate production method using the same. The recycled aggregate production system comprises a primary crusher, a secondary crusher and a vibrating screen, wherein only one grade of recycled aggregate can be obtained at a time, and the secondary crushing noise pollution is large.
The publication No. AU2021104204A4 discloses a recycled coarse aggregate self-compacting concrete, which is prepared by crushing large old concrete into smaller recycled aggregates by a crushing device and processing the recycled coarse aggregates by an Deval abrasion tester. The method does not clearly give out a production method of recycled aggregate with continuous grain size and different grain sizes, and noise pollution is easy to generate in the crushing process.
As shown by the research, the defects of low production efficiency, large noise pollution, poor engineering adaptability and the like of the recycled aggregate with continuous size fractions generally exist in the prior art.
Disclosure of Invention
The invention aims to solve the problems of low production efficiency, large noise pollution and poor engineering adaptability of the continuous size fraction recycled aggregate in the prior art.
To achieve the above object, a first aspect of the present invention provides a method for preparing continuous size fraction recycled aggregate based on lateral confining pressure-vertical loading, the method comprising:
(1) Collecting concrete solid waste raw materials;
(2) Pretreating the concrete solid waste raw material to obtain a treated concrete solid waste raw material;
(3) Sending the treated concrete solid waste raw materials into a lateral confining pressure-vertical loading crushing device for crushing treatment to obtain a regenerated mixture I;
(4) The regenerated mixture I enters a fully-closed forced stirrer under the action of gravity to be uniformly stirred, so as to obtain regenerated mixture II;
(5) The regenerated mixture II enters a fully-closed step screening device under the action of gravity to carry out step screening treatment, so that the continuously-sized regenerated aggregate I is obtained;
(6) The recycled aggregate I enters an intelligent transfer functional area under the action of gravity to perform intelligent optimization treatment, so that continuous-size recycled aggregate II is obtained;
(7) And after the recycled aggregate II reaches the stage production target, transferring the recycled aggregate II into a coarse aggregate silo, a fine aggregate silo or a micro powder silo of a finished product storage functional area to obtain the recycled aggregate III with continuous size fractions.
The method provided by the invention has at least the following effects:
(1) The method provided by the invention can obtain the continuous size fraction recycled aggregate, including the recycled coarse aggregate, the recycled fine aggregate and the recycled micro powder in stages on the premise of high production efficiency and low energy consumption.
(2) The method provided by the invention is based on the process of preparing the continuous size fraction recycled aggregate by confining pressure-vertical loading, is completely different from the traditional crushing preparation process, does not generate noise pollution, can be carried out in a totally-enclosed state (such as production links of uniform stirring, step screening and the like), and can greatly reduce dust pollution.
(3) The method provided by the invention can crush the recycled aggregate with 1 or more grades, obtain more recycled aggregates with continuous grades and recycled micro powder, timely adjust the grading balance among the recycled aggregates, and comprehensively meet the grading requirements of actual engineering mix proportion design on recycled aggregate diversification.
Drawings
FIG. 1 is a process flow diagram of the invention for preparing continuous size fraction recycled aggregate based on lateral confining pressure-vertical loading;
FIG. 2 is a schematic material flow diagram of the invention for preparing continuous size fraction recycled aggregate based on lateral confining pressure-vertical loading;
FIG. 3 is a three-dimensional perspective view of the crushing member of the lateral confining pressure-vertical loading crushing device in an embodiment of the invention;
FIG. 4 is a graph showing the quality of recycled aggregate I of example 1 of the present invention with particle size ranges D 4、D5、D6、D7;
FIG. 5 is a continuous fraction distribution chart of recycled aggregate I in example 1 of the present invention;
FIG. 6 is a three-dimensional perspective view of a step screening function in an embodiment of the present invention;
FIG. 7 is a continuous fraction distribution chart of recycled aggregate I-3 in example 1 of the present invention;
FIG. 8 is a continuous fraction optimization comparison chart of the recycled aggregate I and the recycled aggregate II in example 1 of the present invention;
FIG. 9 is a continuous size fraction distribution chart of recycled aggregate I in example 2 of the present invention;
FIG. 10 is a continuous fraction distribution chart of recycled aggregate I in example 3 of the present invention;
FIG. 11 is a continuous fraction distribution chart of recycled aggregate I in example 4 of the present invention;
FIG. 12 is a continuous fraction distribution chart of recycled aggregate I in example 5 of the present invention;
FIG. 13 is a continuous fraction distribution chart of recycled aggregate I in example 6 of the present invention;
FIG. 14 is a continuous fraction distribution chart of recycled aggregate I in example 7 of the present invention;
FIG. 15 is a continuous fraction distribution chart of recycled aggregate I in example 8 of the present invention;
FIG. 16 is a continuous fraction distribution chart of recycled aggregate I in example 9 of the present invention;
FIG. 17 is a continuous size fraction distribution chart of recycled aggregate I in example 10 of the present invention.
Detailed Description
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
In the invention, the concrete solid waste raw material is concrete waste generated in the process of civil engineering construction, maintenance and disassembly and modification.
In the invention, the step production target is that the obtained continuous size fraction recycled aggregate meets the grading and quantity requirements of the actual engineering concrete or mortar mixing ratio.
In the present invention, the continuous-size-fraction aggregate gradation target is specifically defined and described in "recycled aggregate for recycled concrete" (GB/T25177-2010) or "recycled fine aggregate for concrete and mortar" (GB/T25176-2010).
In the present invention, the "continuous fraction" means that the fraction distribution is continuous and continues to the minimum fraction.
In the invention, the D 1 represents D 1 is more than or equal to 37.5mm, the D 2 represents 31.5mm less than or equal to D 2 <37.5mm, the D 3 represents 26.5mm less than or equal to D 3 <31.5mm, the D 4 represents 19.0mm less than or equal to D 4 <26.5mm, the D 5 represents 16.0mm less than or equal to D 5 <19.0mm, the D 6 represents 9.50mm less than or equal to D 6 <16.0mm, the D 7 represents 4.75mm less than or equal to D 7 <9.50mm, the "D 8" represents 2.36 mm≤D3932 <4.75mm, the "D 8" represents 1.18 mm≤D3932 <2.36mm, the "D 8" represents 0.60 mm≤D3932 <1.18mm, the "D 8" represents 0.30 mm≤D3932 <0.60mm, the "D 8" represents 0.15 mm≤D3932 <0.30mm, the "D 8" represents 0.075 mm≤D3932 <0.15mm, and the "D 8" represents D 8 <0.075mm.
In the invention, the regenerated micro powder is aggregate powder with the particle size ranges of D 13 and D 14.
As previously described, a first aspect of the present invention provides a method of preparing continuous size fraction recycled aggregate based on lateral confining pressure-vertical loading, the method comprising:
(1) Collecting concrete solid waste raw materials;
(2) Pretreating the concrete solid waste raw material to obtain a treated concrete solid waste raw material;
(3) Sending the treated concrete solid waste raw materials into a lateral confining pressure-vertical loading crushing device for crushing treatment to obtain a regenerated mixture I;
(4) The regenerated mixture I enters a fully-closed forced stirrer under the action of gravity to be uniformly stirred, so as to obtain regenerated mixture II;
(5) The regenerated mixture II enters a fully-closed step screening device under the action of gravity to carry out step screening treatment, so that the continuously-sized regenerated aggregate I is obtained;
(6) The recycled aggregate I enters an intelligent transfer functional area under the action of gravity to perform intelligent optimization treatment, so that continuous-size recycled aggregate II is obtained;
(7) And after the recycled aggregate II reaches the stage production target, transferring the recycled aggregate II into a coarse aggregate silo, a fine aggregate silo or a micro powder silo of a finished product storage functional area to obtain the recycled aggregate III with continuous size fractions.
Preferably, the concrete solid waste raw materials comprise cement-based material performance detection test block solid waste generated in the civil engineering construction process and concrete solid waste generated by demolishing and reforming the civil engineering structure;
the concrete solid waste generated by the demolition and transformation of the civil engineering structure is separated into reinforcing steel bars and large building rubbish in advance and is crushed in advance, and the macroscopic size of the concrete solid waste is less than 100mm;
The cement-based material performance detection test block solid waste generated in the civil engineering construction process comprises concrete strength detection test block solid waste, concrete impermeability detection test block solid waste, cement strength detection test block solid waste and mortar strength detection test block solid waste, and the macroscopic size of the solid waste is less than 100mm.
Preferably, the solid waste of the concrete strength detection test block, the solid waste of the concrete impermeability detection test block and the solid waste of the cement strength detection test block are obtained by destructive detection of the concrete strength detection test block, the concrete impermeability detection test block, the cement strength detection test block and the mortar strength detection test block.
Preferably, the original dimensions of the concrete strength test block include 100mm by 100mm,150mm by 150mm, and 200mm by 200mm.
Further preferably, the original size of the concrete impermeability test block is 175mm 185mm 150mm.
Preferably, the original size of the cement strength test block is 40mm 160mm.
Preferably, the original size of the mortar strength detection test block is 70.7mm by 70.7mm.
Preferably, in the step (2), the pretreatment includes manual sorting, water washing treatment, and drying treatment performed sequentially.
In the step (2), the manual sorting is preferably performed by manually picking up macroscopic block impurities, the water washing treatment is mainly performed by removing manually difficult building solid wastes such as dregs, and the drying treatment is performed by adopting a normal-temperature air drying mode.
Further preferably, in the step (2), the treated concrete solid waste raw material does not contain reinforcing steel bars, wood, plastics, foam boards, bricks and paper shell garbage.
Preferably, a belt conveyor and a first medium-speed bucket elevator are sequentially adopted to convey the treated concrete solid waste raw materials into the lateral confining pressure-vertical loading crushing device.
In the invention, the belt conveyor is not particularly required, and the belt conveyor is 6m in length, 0.8m in width and 0.5t in bearing, has a lifting function and a folding function, supports forward and reverse rotation, oxford sailline belts and thickens rubber belts, and adopts an industrial cycloidal needle copper core motor. The invention is not described in detail herein, and those skilled in the art should not understand the limitation of the invention.
Further preferably, in the step (3), the crushing treatment condition at least satisfies that vertical loading is performed at a loading speed of 1-10 KN/S, and unloading is performed after the loading reaches 100-1000 KN.
More preferably, in the step (3), the crushing treatment condition is also satisfied that the crushing treatment is continued for 60 seconds after the load reaches 100-1000 KN.
Preferably, in step (3), the crushing treatment is performed in a crushing member comprising a loading press column, a crushing enclosure, a crushing chassis.
Further preferably, in the crushing member, the wall thickness of the crushing enclosure is 8-20 mm.
Preferably, in the crushing means, the diameter of the loading ram < the inner diameter of the crushing enclosure, and the height of the loading ram = the height of the crushing enclosure.
More preferably, in the step (3), the lateral confining pressure-vertical loading crushing device comprises a vertical loading member capable of applying a vertical load, and the range of the vertical loading member capable of applying the load is 0-2000KN.
Preferably, in step (3), the lateral confining pressure-vertical loading crushing device is 4.2m from the ground.
Preferably, in the step (4), the condition of uniform stirring treatment at least meets the conditions that the time is 30-300 s and the rotating speed of a stirring shaft is 30-90 r/min.
Further preferably, in the step (4), the condition of the uniform stirring treatment is at least satisfied that the power of the motor is 1.5kw and the voltage of the power supply is 380V.
Preferably, in the step (4), the stirring capacity of the fully-enclosed forced stirrer is 200L, and the distance between the center of the fully-enclosed forced stirrer and the ground is 2.8m, and the distance between the fully-enclosed forced stirrer and the center of the crushing member of the lateral confining pressure-vertical loading crushing device is 1.4m.
Preferably, in the step (5), the step screening treatment is performed in the totally-enclosed step screening equipment, the totally-enclosed step screening equipment comprises a step screening functional area, the step screening functional area adopts a nonstandard vibrating screen, the nonstandard vibrating screen consists of 13 layers of square hole screens and a chassis, the outer diameter of each square hole screen is 1800mm, the inner diameter of each square hole screen is 1720mm, and the side length of each square hole screen is 37.5mm, 31.5mm, 26.5mm, 19.0mm, 16.0mm, 9.50mm, 4.75m, 2.36mm, 1.18mm, 0.60mm, 0.30mm, 0.15mm and 0.075mm in sequence from top to bottom.
In the step (5), preferably, a cylindrical discharge port is formed in each of the chassis of the step screening functional area and each of the square hole sieves of the step screening functional area, the cylindrical discharge port is in butt joint with the intelligent transfer functional area, and a 3-degree inclination angle is formed in a direction facing the cylindrical discharge port of each screen of the square hole sieves, so that the regenerated aggregate in each size range can be smoothly transferred.
Further preferably, in the step (5), the condition of the step screening treatment at least satisfies that the single screening amount is 2-50 kg and the single screening time is 5-30 min.
More preferably, in the step (5), the condition of the step screening treatment is also satisfied that the amount of screening which can be completed per day is not less than 7.2t, and the step screening treatment can be operated for 12 hours per day.
Preferably, in the step (5), the totally-enclosed step screening device is installed on the ground through a base and is located right below the totally-enclosed forced mixer, and a distance between a top cylindrical feeding port of the step screening functional area and the bottom of the totally-enclosed forced mixer is 0.5m.
Further preferably, the intelligent transfer function area is located 1.5m below the ground, and the vertical distance between the feed inlet of the intelligent transfer function area and the center of the cylindrical discharge outlet of the chassis of the step screening function area is 0.5m.
Preferably, in step (6), the intelligent optimization process includes:
Firstly, comparing and calculating the recycled aggregate I with a continuous size-graded aggregate grading target to obtain recycled aggregate I-2 and recycled aggregate I-1;
the recycled aggregate I-2 is sent to the lateral confining pressure-vertical loading crushing device through a second medium-speed bucket elevator to be subjected to secondary crushing treatment, and secondary uniform stirring treatment and secondary step screening treatment are sequentially carried out to obtain recycled aggregate I-3 with continuous size fractions;
The recycled aggregate I-3 enters an intelligent transfer functional area and then is mixed and optimized with the recycled aggregate I-1 to obtain recycled aggregate II with continuous size fractions;
Wherein the recycled aggregate I-2 is aggregate with the size fraction in a first size fraction range in the recycled aggregate I, and the first size fraction range is at least one selected from D1≥37.5mm、31.5mm≤D2<37.5mm、26.5mm≤D3<31.5mm、19.0mm≤D4<26.5mm、16.0mm≤D5<19.0mm、9.50mm≤D6 <16.0mm、4.75mm≤D7<9.50mm、2.36mm≤D8<4.75mm、1.18mm≤D9<2.36mm、0.60mm≤D10<1.18mm、0.30mm≤D11<0.60mm.
Further preferably, the recycled aggregate I-3 comprises recycled aggregate and recycled micro powder of the recycled aggregate I-2 with the largest size fraction and all the size fractions below.
Preferably, in step (6), the intelligent transfer function area includes an intelligent regulation module, an automatic weighing module and a transfer distribution module.
Further preferably, in the step (6), the automatic weighing module comprises 14 nonstandard intelligent automatic weight scales (adopting belt weight detection), the automatic weight scales are connected with 13 layers of square hole sieves and cylindrical discharge holes of a chassis in the totally-enclosed step screening equipment, a controller is arranged in the intelligent regulation module, the controller performs balance calculation for real-time comparison of the current aggregate accumulated production data of each particle grade and the continuous aggregate grading target data, subsequent production and grading optimization of regenerated aggregates are guided according to calculation results, dynamic balance among the regenerated aggregates is ensured, the transfer distribution module comprises 14 temporary storage units, each temporary storage unit comprises a feed port a, a discharge port b and a discharge port c, the discharge port b is connected with the lateral confining pressure-vertical loading crushing device, and the discharge port c is connected with a finished product storage functional area (the finished product storage functional area is positioned below the ground by 3m, and the vertical distance between the finished product storage functional area and the discharge port c of the temporary storage unit is 0.5 m).
According to a preferred embodiment, in step (7), the coarse aggregate silo is provided with 7 storage tanks, 7 of which can store coarse aggregates of the following size range, respectively, D 1、D2、D3、D4、D5 、D6、D7;
The fine aggregate silo is provided with 5 storage tanks, and the 5 storage tanks can respectively store fine aggregates with the following particle size ranges, namely D 8、D9、D10、D11、D12;
The micro powder silo is provided with 2 storage tanks, and the 2 storage tanks can respectively store the regenerated micro powder with the following particle size range D 13、D14.
The present invention will be described in detail by examples. In the following examples, unless otherwise specified, all of the raw materials are commercially available.
In the following examples, unless otherwise specified, concrete strength test block solid waste, concrete permeation resistance test block solid waste, cement strength test block solid waste, mortar strength test block solid waste are obtained by subjecting a concrete strength test block, a concrete permeation resistance test block, a cement strength test block, a mortar strength test block to destructive testing, and before the destructive testing is performed,
The original dimensions of the concrete strength detection test block comprise: 100mm by 100mm,150mm by 150mm,200mm by 200mm;
The original size of the concrete impermeability detection test block is 175mm x 185mm x 150mm;
the original size of the cement strength detection test block is 40mm x 160mm;
The original size of the mortar strength detection test block is 70.7mm by 70.7mm.
In the following examples, without particular description, the belt conveyor has a length of 6m, a width of 0.8m, and a load bearing of 0.5t, has a lifting function and a folding function, supports forward and reverse rotation, oxford sails, thickens rubber belts, and adopts an industrial cycloidal pin copper core motor.
The first medium speed bucket elevator and the second medium speed bucket elevator have the output of 1-10t/h, the belt width of 20cm and the power of 1.5kw, and the lower belt pulley adopts a squirrel cage to prevent the material from flowing into the bucket belt and forming the crushing with the surface of the pulley.
In the following examples, without particular explanation, in a lateral confining pressure-vertical loading crushing device, the crushing members comprise a loading compression column, a crushing enclosure, a crushing chassis, and the wall thickness of the crushing members is 12mm, the diameter of the loading compression column is 1mm smaller than the inner diameter of the crushing enclosure, the height of the loading compression column = the height of the crushing enclosure, wherein the inner diameter of the crushing enclosure is 600mm.
The lateral confining pressure-vertical loading crushing device comprises a vertical loading component capable of applying vertical load, wherein the range of the load applied by the vertical loading component is 0-2000KN.
In the totally-enclosed step screening equipment, a vibrating motor is adopted for the nonstandard vibrating screen, a damping spring is arranged at the bottom of the vibrating screen, and the screen frame and the screen mesh are made of 304 stainless steel.
In the finished product storage functional area, the storage tank is a conventional building material storage tank made of stainless steel, the capacity is more than or equal to 10t, and a feed inlet and a discharge outlet are arranged.
Example 1
This example provides a method for preparing continuous size fraction recycled aggregate based on lateral confining pressure-vertical loading, which is performed according to the flow scheme shown in fig. 1 and 2, and includes:
(1) Collecting solid waste of cement-based material performance detection test blocks generated in the civil engineering construction process and concrete solid waste generated by demolishing and reforming a civil engineering structure as concrete solid waste raw materials, wherein the weight of the concrete solid waste raw materials is 40kg;
the concrete solid waste generated by the demolition and transformation of the civil engineering structure is separated into reinforcing steel bars and large building rubbish in advance and is crushed in advance, and the macroscopic size of the concrete solid waste is less than 100mm;
The cement-based material performance detection test block solid waste generated in the civil engineering construction process comprises concrete strength detection test block solid waste, concrete impermeability detection test block solid waste, cement strength detection test block solid waste and mortar strength detection test block solid waste, and the macroscopic size of the solid waste is less than 100mm.
(2) Sequentially carrying out manual sorting, water washing treatment and drying treatment on the concrete solid waste raw materials to obtain treated concrete solid waste raw materials, sequentially adopting a belt conveyor and a first medium-speed bucket elevator to lift the treated concrete solid waste raw materials to a position 5.5m away from the ground, and transferring the concrete solid waste raw materials into a vertical loading component of a lateral confining pressure-vertical loading crushing device 4.2m away from the ground under the action of gravity to obtain compact concrete solid waste raw materials;
the treated concrete solid waste raw material does not contain common construction wastes of construction sites such as steel bars, wood, plastics, foam boards, bricks, paper shells and the like;
The manual sorting is to pick up massive impurities visible to naked eyes, the water washing treatment is mainly to remove building solid wastes which are difficult to sort manually, such as dregs, and the drying treatment is carried out in a normal-temperature air drying mode.
(3) Feeding the concrete solid waste raw materials (10 kg/time) into a crushing member (a three-dimensional structure is shown as figure 3) of the lateral confining pressure-vertical loading crushing device at intervals of 5min for crushing treatment to obtain a continuous-size-fraction regenerated mixture I;
The crushing treatment is controlled according to the maximum load, and is vertically loaded at a loading speed of 5KN/S, and the crushing treatment is continuously carried out for 60S after 1000KN is reached, and the crushing treatment is unloaded;
(4) The regenerated mixture I falls into a fully-closed forced stirrer under the action of gravity to be uniformly stirred to obtain a continuously-sized regenerated mixture II, wherein the uniform stirring condition is satisfied that the time is 120s, the rotating speed of a stirring shaft is 45r/min, the power of a motor is 1.5kw, and the voltage of a power supply is 380V;
the stirring capacity of the full-closed forced stirrer is 200L, the distance between the center of the full-closed forced stirrer and the ground is 2.8m, and the full-closed forced stirrer is positioned right below the lateral confining pressure-vertical loading crushing device, and the distance between the full-closed forced stirrer and the center of a crushing member of the lateral confining pressure-vertical loading crushing device is 1.4m.
(5) The recycled mixture II enters a fully-closed step screening device under the action of gravity to be subjected to step screening treatment, so that recycled aggregate I with continuous size fractions is obtained, wherein the aggregate product phases with the size fraction ranges of D 4、D5、D6、D7 in the recycled aggregate I are shown in figure 4, and the continuous size fraction distribution diagram of the recycled aggregate I is shown in figure 5;
As can be seen from fig. 4, 11 recycled aggregates with size ranges are obtained respectively, which are ：D4、D5、D6、D7、D8、D9、D10、D11、D12、D13、D14; respectively, wherein the mass ratio of the recycled aggregates with size ranges of D 6、D7、D8 respectively is more than 10%;
However, because the mass proportion of the recycled aggregate with the size range of D 9、D10、D11、D12 is relatively less, the recycled aggregate with the size range of D 6、D7、D8 is returned to the lateral confining pressure-vertical loading crushing device for secondary crushing treatment, so that the mass proportion of the recycled aggregate with the large size range in the recycled aggregate I is relatively reduced, and the mass proportion of the recycled aggregate with the small size range is relatively increased, thereby achieving the purpose of regulating and optimizing grading.
The fully-closed step screening equipment comprises a step screening functional area (a three-dimensional structure is shown in figure 6), the step screening functional area adopts a nonstandard vibrating screen, the nonstandard vibrating screen consists of 13 layers of square hole screens and a chassis, the outer diameter of each square hole screen is 1800mm, the inner diameter of each square hole screen is 1720mm, the side length of each square hole screen is 37.5mm, 31.5mm, 26.5mm, 19.0mm, 16.0mm, 9.50mm, 4.75m, 2.36mm, 1.18mm, 0.60mm, 0.30mm, 0.15mm and 0.075mm, the outer diameter and the inner diameter of each chassis are consistent with those of each square hole screen, and no sieve holes are formed in the chassis, and the function of the fully-closed step screening equipment is that the minimum regenerated powder is received;
The chassis of the step screening functional area and each square hole screen of the step screening functional area are provided with a cylindrical discharge port, the cylindrical discharge port is in butt joint with the intelligent transfer functional area, and the screen mesh of each square hole screen is provided with an inclination angle of 3 degrees in the direction facing the cylindrical discharge port, so that the regenerated aggregate in each size range can be smoothly transferred;
The step screening treatment conditions are met, wherein the single screening amount is 50kg, the single screening time is 5min, the screening amount which can be completed per day is more than or equal to 7.2t, and the operation can be carried out for 12h per day;
The totally-enclosed step screening equipment is arranged on the ground through a base and is positioned right below the totally-enclosed forced mixer, and the distance between the top cylindrical feeding port of the step screening functional area and the bottom of the totally-enclosed forced mixer is 0.5m;
the intelligent transfer function area is located 1.5m below the ground, and the vertical distance between the feed inlet of the intelligent transfer function area and the center of the cylindrical discharge hole of the chassis of the step screening function area is 0.5m.
(6) The recycled aggregate I enters an intelligent transfer functional area under the action of gravity to perform intelligent optimization treatment;
the intelligent optimization process is as follows:
Firstly, comparing and calculating the recycled aggregate I with a continuous size-fraction aggregate grading target, separating recycled aggregate with size-fraction ranges of D 6、D7、D8 from the recycled aggregate I, namely recycled aggregate I-2, and the balance being recycled aggregate I-1, wherein the mass of recycled aggregate with size-fraction range of D 6 in the recycled aggregate I-2 is 2kg, the mass of recycled aggregate with size-fraction range of D 7 is 4kg, and the mass of recycled aggregate with size-fraction range of D 8 is 2kg through intelligent calculation;
The recycled aggregate I-2 is returned to the lateral confining pressure-vertical loading crushing device through a second medium-speed bucket elevator for secondary crushing treatment, and secondary uniform stirring treatment and secondary step screening treatment are sequentially carried out, so that the recycled aggregate I-3 with continuous size fraction is obtained;
The recycled aggregate I-3 enters an intelligent transfer functional area and then is mixed and optimized with the recycled aggregate I-1 to obtain recycled aggregate II with continuous size fractions;
The recycled aggregate I-3 comprises recycled aggregate with the size range of D 6、D7、D8、D9、D10、D11、D12、D13、D14 and recycled micro powder, wherein the continuous size distribution diagram of the recycled aggregate I-3 is shown in figure 7;
As can be seen from fig. 7, in the recycled aggregate I-3, the mass ratio of the recycled aggregate having the size range D9 was 11.84%, the mass ratio of the recycled aggregate having the size range D10 was 8.76%, the mass ratio of the recycled aggregate having the size range D11 was 9.19%, and the mass ratio of the recycled aggregate having the size range D12 was 6.85%;
continuous fraction optimization pairs of the recycled aggregate I and the recycled aggregate II are shown in fig. 8;
As can be seen from fig. 8, in the recycled aggregate I, the mass ratio of the recycled aggregate having the size range of D 6、D7、D8 is effectively reduced, while the mass ratio of the recycled aggregate having the size range of D 9、D10、D11、D12 is significantly improved, and thus, the recycled aggregate grading is adjusted and optimized.
The intelligent transfer functional area comprises an intelligent regulation module, an automatic weighing module and a transfer distribution module;
the automatic weighing module comprises 14 nonstandard intelligent automatic weight scales (adopting belt weight detection), wherein the automatic weight scales are connected with 13 layers of square hole sieves and cylindrical discharge holes of a chassis in the totally-enclosed step screening equipment, a controller is arranged in the intelligent regulation module, the controller carries out real-time comparison balance calculation on the accumulated production data of all current particle aggregates and the continuous particle aggregate grading target data, the follow-up production and grading optimization of the regenerated aggregates are guided according to calculation results, dynamic balance among the regenerated aggregates is ensured, the transfer distribution module comprises 14 temporary storage units, each temporary storage unit comprises a feed inlet a, a discharge outlet b and a discharge outlet c, wherein the discharge outlet b is connected with the lateral confining pressure-vertical loading crushing device, and the discharge outlet c is connected with a finished product storage functional area (the finished product storage functional area is 3 meters below the ground and the vertical distance between the finished product storage functional area and the discharge outlet c of the temporary storage unit is 0.5 m);
(7) After the continuous-grade recycled aggregate II reaches the stage production target, transferring the recycled aggregate II into a coarse aggregate silo, a fine aggregate silo or a micro powder silo of a finished product storage functional area to obtain continuous-grade recycled aggregate III;
the coarse aggregate silo is provided with 7 storage tanks, and the 7 storage tanks can respectively store coarse aggregates with the following grain size ranges, namely D 1、D2、D3、D4、D5 、D6、D7;
The fine aggregate silo is provided with 5 storage tanks, and the 5 storage tanks can respectively store fine aggregates with the following particle size ranges, namely D 8、D9、D10、D11、D12;
The micro powder silo is provided with 2 storage tanks, and the 2 storage tanks can respectively store the regenerated micro powder with the following particle size range D 13、D14.
Example 2
This example was conducted in the same manner as in example 1 except that in step (3), recycled aggregate (10 kg/time) of size fraction range D 4 was fed into the side confining pressure-vertical loading crushing apparatus at 5min intervals to conduct the crushing treatment;
In step (5), the size fraction range of the recycled aggregate I comprises ：D4、D5、D6、D7、D8、D9、D10、D11、D12、D13、D14;
And the continuous size fraction distribution of the recycled aggregate I, as shown in fig. 9,
As can be seen from fig. 9, the mass ratio of the recycled aggregate with the size range of D 4 was 2.13%, and the mass ratio of the recycled aggregate with the size range of D 6、D7、D8、D9 was >10%, respectively, wherein the mass ratio of the recycled aggregate with the size range of D 7 was 22.37%.
The remaining conditions and parameters were the same as in example 1.
Example 3
This example was conducted in the same manner as in example 1 except that in step (3), recycled aggregate (10 kg/time) of size fraction range D 5 was fed into the side confining pressure-vertical loading crushing apparatus at 5min intervals to conduct the crushing treatment;
in step (5), the size fraction range of the recycled aggregate I comprises ：D5、D6、D7、D8、D9、D10、D11、D12、D13、D14;
And the continuous size fraction distribution of the recycled aggregate I, as shown in fig. 10,
As can be seen from fig. 10, the mass ratio of the recycled aggregate having the size range D 5 was 3.37%, and the mass ratio of the recycled aggregate having the size range D 6、D7、D8、D9 was >10%, respectively, wherein the mass ratio of the recycled aggregate having the size range D 6 was 24.63%.
The remaining conditions and parameters were the same as in example 1.
Example 4
This example was conducted in the same manner as in example 1 except that in step (3), recycled aggregate (10 kg/time) of size fraction range D 6 was fed into the side confining pressure-vertical loading crushing apparatus at 5min intervals to conduct the crushing treatment;
in step (5), the size fraction range of the recycled aggregate I comprises ：D6、D7、D8、D9、D10、D11、D12、D13、D14;
And the continuous size fraction distribution of the recycled aggregate I, as shown in fig. 11,
As can be seen from fig. 11, the mass ratio of the recycled aggregate with the size range of D 6 was 17.58%, and the mass ratio of the recycled aggregate with the size range of D 7、D8、D9 was >10%, respectively, wherein the mass ratio of the recycled aggregate with the size range of D 7 was 27.32%.
The remaining conditions and parameters were the same as in example 1.
Example 5
This example was conducted in the same manner as in example 1 except that in step (3), recycled aggregate (10 kg/time) of size fraction range D 7 was fed into the side confining pressure-vertical loading crushing apparatus at 5min intervals to conduct the crushing treatment;
In the step (5), the size fraction range of the recycled aggregate I comprises D 7、D8、D9、D10、D11、D12、D13、D14;
and the continuous size fraction distribution of the recycled aggregate I, as shown in fig. 12,
As can be seen from fig. 12, the mass ratio of the recycled aggregate having the size range D 7 was 29.36%, the mass ratio of the recycled aggregate having the size range D 8、D11 was >10%, and the mass ratio of the recycled aggregate having the size range D 8 was 22.27%.
The remaining conditions and parameters were the same as in example 1.
Example 6
This example was conducted in the same manner as in example 1 except that in step (3), recycled aggregate (10 kg/time) of size fraction range D 8 was fed into the side confining pressure-vertical loading crushing apparatus at 5min intervals to conduct the crushing treatment;
in the step (5), the size fraction range of the recycled aggregate I comprises D 8、D9、D10、D11、D12、D13、D14;
and the continuous size fraction distribution of the recycled aggregate I, as shown in fig. 13,
As can be seen from fig. 13, the mass of the recycled aggregate having the size range D 8 was 37.57%, and the mass of the recycled aggregate having the size range D 9、D10、D11 was >10%, respectively, wherein the mass of the recycled aggregate having the size range D 9 was 18.75%.
The remaining conditions and parameters were the same as in example 1.
Example 7
This example was conducted in the same manner as in example 1 except that in step (3), recycled aggregate (10 kg/time) of size fraction range D 9 was fed into the side confining pressure-vertical loading crushing apparatus at 5min intervals to conduct the crushing treatment;
In the step (5), the size fraction range of the recycled aggregate I comprises D 9、D10、D11、D12、D13、D14;
And the continuous size fraction distribution of the recycled aggregate I, as shown in fig. 14,
As can be seen from fig. 14, the mass ratio of the recycled aggregate having the size range D 9 reached 55.17%, and the mass ratio of the recycled aggregate having the size range D 10、D11、D13 was >10%.
The remaining conditions and parameters were the same as in example 1.
Example 8
This example was conducted in the same manner as in example 1 except that in step (3), recycled aggregate (10 kg/time) of size fraction range D 10 was fed into the side confining pressure-vertical loading crushing apparatus at 5min intervals to conduct the crushing treatment;
In the step (5), the size fraction range of the recycled aggregate I comprises D 10、D11、D12、D13、D14;
and the continuous size fraction distribution of the recycled aggregate I, as shown in fig. 15,
As can be seen from fig. 15, the mass ratio of the recycled aggregate having the size range D 10 reached 42.54%, and the mass ratio of the recycled aggregate having the size range D 11、D12、D13 was >10%.
The remaining conditions and parameters were the same as in example 1.
Example 9
This example was conducted in the same manner as in example 1 except that in step (3), recycled aggregate (10 kg/time) of size fraction range D 11 was fed into the side confining pressure-vertical loading crushing apparatus at 5min intervals to conduct the crushing treatment;
in the step (5), the size fraction range of the recycled aggregate I comprises D 11、D12、D13、D14;
and the continuous size fraction distribution of the recycled aggregate I, as shown in fig. 16,
As can be seen from fig. 16, the mass ratio of the recycled aggregate having the size fraction range D 11 reached 41.84%, and the mass ratio of the recycled aggregate having the size fraction range D 12、D13 was respectively >10%.
The remaining conditions and parameters were the same as in example 1.
Example 10
This example was conducted in the same manner as in example 1 except that in step (3), recycled aggregate (10 kg/time) of size fraction range D 12 was fed into the side confining pressure-vertical loading crushing apparatus at 5min intervals to conduct the crushing treatment;
In the step (5), the size fraction range of the recycled aggregate I comprises D 12、D13、D14;
And the continuous size fraction distribution of the recycled aggregate I, as shown in fig. 17,
As can be seen from fig. 17, the mass ratio of the recycled aggregate having the size fraction range D 12 reached 46.80%, and the mass ratio of the recycled aggregate having the size fraction range D 13 reached 50.74%.
The remaining conditions and parameters were the same as in example 1.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.
Claims (8)
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| CN107129173A (en) * | 2017-06-27 | 2017-09-05 | 杜辉 | A kind of construction refuse regenerated aggregate manufacture device |
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| US6629010B2 (en) * | 2001-05-18 | 2003-09-30 | Advanced Vision Particle Measurement, Inc. | Control feedback system and method for bulk material industrial processes using automated object or particle analysis |
| CN109883860B (en) * | 2019-02-28 | 2021-05-04 | 山东省交通科学研究院 | A kind of dynamic determination method of aggregate crushing value in full particle size range of mixture |
| JP7554451B2 (en) * | 2020-07-28 | 2024-09-20 | 株式会社中山ホールディングス | Recycled aggregate production system and recycled aggregate production method |
| CN115974440B (en) * | 2023-01-03 | 2024-08-27 | 武汉理工大学 | Method for preparing multi-grade recycled fine aggregate and high-quality recycled coarse aggregate by using waste concrete |
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| CN107129173A (en) * | 2017-06-27 | 2017-09-05 | 杜辉 | A kind of construction refuse regenerated aggregate manufacture device |
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