A method for preparing continuously sized recycled aggregate based on lateral confining pressure-vertical loading

Abstract

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 treatment 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

[0001] The present invention relates to the field of construction solid waste resource utilization, and in particular to a method for preparing continuously sized recycled aggregate based on lateral confining pressure-vertical loading. Background Art

[0002] Civil engineering projects continuously generate large amounts of concrete waste (hereafter referred to as concrete solid waste) during construction, maintenance, and demolition. In recent years, the amount of concrete solid waste dumped has gradually increased. To address the series of environmental issues caused by this rapid increase in concrete solid waste, there is an urgent need to recycle and utilize concrete solid waste.

[0003] Currently, there is considerable technological accumulation and progress in the recycling of concrete solid waste. Conventional methods involve sorting, cleaning, crushing, and screening concrete solid waste to produce coarse and fine aggregates, as well as recycled powder, which are then used to produce green building materials such as recycled concrete and unfired bricks.

[0004] CN113117857A discloses an integrated system for the intelligent crushing of continuously graded recycled aggregates. The system comprises a feeding device, a primary crushing device, a screening device, a first transmission device, a secondary crushing device, and a second transmission device, sequentially arranged along the aggregate crushing and feeding direction. This method requires multiple beating or impact crushing operations to produce "continuously graded recycled aggregates." The production process is complex, noise pollution is easily generated during the crushing process, and coarse and fine aggregates are mixed together for production and use according to specific gradations, making it unsuitable for the diverse aggregate grading requirements of actual engineering applications.

[0005] CN116444218A discloses fully recycled concrete, its preparation method, and its application. This method involves sequentially crushing and iron removal of recycled building materials, followed by secondary screening, to produce coarse aggregate, fine aggregate, and partially crushed aggregate particles. The coarse aggregate has a particle size greater than 4.75 mm and ≤ 8.25 mm, and the fine aggregate has a particle size less than 4.75 mm. The coarse and fine aggregates produced by this method are not graded, failing to meet the requirements for different aggregate sizes in concrete mix design. Furthermore, the crushing process generates noise pollution.

[0006] CN103332881A discloses a method for preparing high-quality recycled concrete aggregate. This method involves sorting, hammering, primary crushing, primary screening, rod milling, secondary screening, and cleaning waste concrete. The graded aggregates are then mixed according to the required gradation to produce recycled coarse aggregate of varying particle size requirements. This method involves a seven-step process for producing recycled aggregate of varying particle size requirements, and the hammering, crushing, and rod milling processes generate significant noise pollution.

[0007] CN117563766A discloses a method and apparatus for sorting construction waste. This method utilizes a jaw crusher, an impact crusher, screening equipment, magnetic sorting equipment, air separation and impurity removal equipment, and other supporting machinery. This method requires secondary crushing, four-stage separation, and multiple impurity removal steps to produce recycled aggregate of varying particle sizes. Furthermore, the jaw and impact crushing processes generate significant noise pollution.

[0008] Publication No. US202217934473A discloses a method for producing recycled concrete. This method uses control signals from a control system to adjust the operating state of a crusher, crushing concrete solid waste into recycled aggregate of a specific size and geometry. This method only produces recycled aggregate of a single particle size, and the process of crushing concrete solid waste into recycled aggregate of a specific size and geometry is prone to noise pollution.

[0009] Publication No. KR20220048400A discloses an apparatus for producing recycled aggregate for concrete. The apparatus comprises a chute-shaped aggregate supply unit, a crushing and crack induction unit, a compression and crushing unit, a cyclone dust collection unit, and a screen unit. This apparatus produces recycled aggregate through the crushing and crack induction unit and the compression and crushing unit. The production process is complex, resulting in only one size of recycled aggregate at a time and generating noise pollution.

[0010] Publication No. KR20210009547A discloses a recycled aggregate production system and a method for producing recycled aggregate using the system. The recycled aggregate production system includes a primary crusher, a secondary crusher, and a vibrating screen. This method only produces one size of recycled aggregate at a time, and the secondary crushing process produces significant noise pollution.

[0011] Publication No. AU2021104204A4 discloses a self-compacting concrete using recycled coarse aggregate. This method uses a crushing device to break down large pieces of old concrete into smaller pieces of recycled aggregate, which are then processed using a Deval abrasion tester. This method does not clearly specify methods for producing recycled aggregate of continuous or varying particle sizes, and the crushing process is prone to generating noise pollution.

[0012] From the above research, it can be seen that the existing technical solutions generally have defects such as low production efficiency of recycled aggregate with continuous particle size, high noise pollution and poor engineering adaptability. Summary of the Invention

[0013] The purpose of the present invention is to solve the problems of low production efficiency, high noise pollution and poor engineering adaptability of continuous granularity recycled aggregate in existing crushing technology.

[0014] In order to achieve the above object, the first aspect of the present invention provides a method for preparing continuously sized recycled aggregate based on lateral confining pressure-vertical loading, the method comprising:

[0015] (1) Collecting concrete solid waste raw materials;

[0016] (2) pre-treating the concrete solid waste raw material to obtain treated concrete solid waste raw material;

[0017] (3) feeding the treated concrete solid waste raw material into a lateral confining pressure-vertical loading crushing device for crushing to obtain a recycled mixture I;

[0018] (4) The recycled mixture I enters a fully enclosed forced mixer under the action of gravity for uniform stirring to obtain recycled mixture II;

[0019] (5) The recycled mixture II enters a fully enclosed cascade screening device under the action of gravity for cascade screening to obtain recycled aggregate I of continuous particle size;

[0020] (6) The recycled aggregate I enters the intelligent transfer functional area under the action of gravity for intelligent optimization processing to obtain recycled aggregate II of continuous particle size;

[0021] (7) When the recycled aggregate II reaches the stage production target, it is transferred to the coarse aggregate silo, fine aggregate silo or micro-powder silo in the finished product storage functional area to obtain recycled aggregate III of continuous particle size.

[0022] The method provided by the present invention has at least the following effects:

[0023] (1) The method provided by the present invention can obtain recycled aggregate of continuous particle size in stages, including recycled coarse aggregate, recycled fine aggregate and recycled micro powder, under the premise of high production efficiency and low energy consumption.

[0024] (2) The method provided by the present invention is based on the process of preparing continuous granularity recycled aggregates by confining pressure-vertical loading. It is completely different from the traditional crushing preparation process, does not generate noise pollution, and can be carried out in a fully closed state (such as uniform mixing, step screening and other production links), which can greatly reduce dust pollution.

[0025] (3) The method provided by the present invention can crush recycled aggregates of one or more particle sizes and obtain recycled aggregates and recycled fine powders of more and continuous particle sizes, adjust the gradation balance between recycled aggregates in a timely manner, and fully meet the diversified gradation requirements of recycled aggregates in actual engineering mix design. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a process flow chart for preparing continuously sized recycled aggregate based on lateral confining pressure-vertical loading according to the present invention;

[0027] Figure 2 Schematic diagram of the material flow for preparing continuously sized recycled aggregate based on lateral confining pressure-vertical loading according to the present invention;

[0028] Figure 3 3D structural diagram of a crushing component of a lateral confining pressure-vertical loading crushing device according to an embodiment of the present invention;

[0029] Figure 4 is a phase diagram of aggregates having particle sizes of D4, D5, D6, and D7 in the recycled aggregate I in Example 1 of the present invention;

[0030] Figure 5 is a continuous particle size distribution diagram of the recycled aggregate I in Example 1 of the present invention;

[0031] Figure 6 This is a three-dimensional structural diagram of the step screening functional area in an embodiment of the present invention;

[0032] Figure 7 is a continuous particle size distribution diagram of the recycled aggregate I-3 in Example 1 of the present invention;

[0033] Figure 8 3 is a comparison diagram of continuous particle size optimization of the recycled aggregate I and the recycled aggregate II in Example 1 of the present invention;

[0034] Figure 9 Continuous particle size distribution diagram of recycled aggregate 1 in Example 2 of the present invention;

[0035] Figure 10 is a continuous particle size distribution diagram of recycled aggregate 1 in Example 3 of the present invention;

[0036] Figure 11 is a continuous particle size distribution diagram of the recycled aggregate 1 in Example 4 of the present invention;

[0037] Figure 12 is a continuous particle size distribution diagram of recycled aggregate 1 in Example 5 of the present invention;

[0038] Figure 13 is a continuous particle size distribution diagram of recycled aggregate 1 in Example 6 of the present invention;

[0039] Figure 14 is a continuous particle size distribution diagram of recycled aggregate 1 in Example 7 of the present invention;

[0040] Figure 15 is a continuous particle size distribution diagram of recycled aggregate 1 in Example 8 of the present invention;

[0041] Figure 16 is a continuous particle size distribution diagram of recycled aggregate 1 in Example 9 of the present invention;

[0042] Figure 17 This is a continuous particle size distribution diagram of the recycled aggregate I in Example 10 of the present invention. DETAILED DESCRIPTION

[0043] The endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

[0044] In the present invention, the concrete solid waste raw material is concrete waste generated during the construction, maintenance and demolition of civil engineering projects.

[0045] In the present invention, the phased production goal is that the obtained continuous particle size recycled aggregate meets the gradation and quantity requirements of the actual engineering concrete or mortar mix ratio.

[0046] In the present invention, the gradation target of the continuous particle size aggregate is clearly defined and described in "Recycled Aggregate for Recycled Concrete" (GB / T25177-2010) or "Recycled Fine Aggregate for Concrete and Mortar" (GB / T25176-2010).

[0047] In the present invention, the "continuous particle size" refers to a particle size distribution that is continuous and extends to the smallest particle size.

[0048] In the present invention, the "D1" represents D1 ≥ 37.5mm, the "D2" represents 31.5mm ≤ D2 < 37.5mm, the "D3" represents 26.5mm ≤ D3 < 31.5mm, the "D4" represents 19.0mm ≤ D4 < 26.5mm, the "D5" represents 16.0mm ≤ D5 < 19.0mm, the "D6" represents 9.50mm ≤ D6 < 16.0mm, the "D7" represents 4.75mm ≤ D7 < 9.50mm, the "D8" represents 2.36mm ≤ D8 < 4.75mm, the "D9" represents 1.18mm ≤ D9 < 2.36mm, and the "D 10 " represents 0.60mm≤D 10 <1.18mm, the "D 11 " represents 0.30mm≤D 11 <0.60mm, the "D 12 " represents 0.15mm≤D 12 <0.30mm, the "D 13 " represents 0.075mm≤D 13 <0.15mm, the "D14 "Represents D 14 <0.075mm.

[0049] In the present invention, the regenerated micro powder has a particle size range of D 13 and D 14 of aggregate powder.

[0050] As mentioned above, the first aspect of the present invention provides a method for preparing continuously sized recycled aggregate based on lateral confining pressure-vertical loading, the method comprising:

[0051] (1) Collecting concrete solid waste raw materials;

[0052] (2) pre-treating the concrete solid waste raw material to obtain treated concrete solid waste raw material;

[0053] (3) feeding the treated concrete solid waste raw material into a lateral confining pressure-vertical loading crushing device for crushing to obtain a recycled mixture I;

[0054] (4) The recycled mixture I enters a fully enclosed forced mixer under the action of gravity for uniform stirring to obtain recycled mixture II;

[0055] (5) The recycled mixture II enters a fully enclosed cascade screening device under the action of gravity for cascade screening to obtain recycled aggregate I of continuous particle size;

[0056] (6) The recycled aggregate I enters the intelligent transfer functional area under the action of gravity for intelligent optimization processing to obtain recycled aggregate II of continuous particle size;

[0057] (7) When the recycled aggregate II reaches the stage production target, it is transferred to the coarse aggregate silo, fine aggregate silo or micro-powder silo in the finished product storage functional area to obtain recycled aggregate III of continuous particle size.

[0058] Preferably, the concrete solid waste raw materials include cement-based material performance test block solid waste generated during civil engineering construction and concrete solid waste generated during the demolition and reconstruction of civil engineering structures;

[0059] The concrete solid waste generated by the demolition and reconstruction of the civil engineering structure has been pre-sorted to remove steel bars and large pieces of construction waste, and has been crushed in advance, and the macroscopic size of the concrete solid waste is less than 100 mm;

[0060] The cement-based material performance test block solid waste generated during the civil engineering construction process includes concrete strength test block solid waste, concrete anti-permeability test block solid waste, cement strength test block solid waste, and mortar strength test block solid waste, and the macroscopic size of the solid waste is <100mm.

[0061] Preferably, the concrete strength test block solid waste, the concrete anti-permeability test block solid waste, the cement strength test block solid waste, and the mortar strength test block solid waste are obtained by destructive testing of concrete strength test blocks, concrete anti-permeability test blocks, cement strength test blocks, and mortar strength test blocks.

[0062] Preferably, the original sizes of the concrete strength test block include: 100mm*100mm*100mm, 150mm*150mm*150mm, 200mm*200mm*200mm.

[0063] Further preferably, the original size of the concrete anti-seepage test block is: 175mm*185mm*150mm.

[0064] Preferably, the original size of the cement strength test block is: 40mm*40mm*160mm.

[0065] Preferably, the original size of the mortar strength test block is: 70.7mm*70.7mm*70.7mm.

[0066] Preferably, in step (2), the pretreatment includes manual sorting, water washing, and drying.

[0067] Preferably, in step (2), the manual sorting is to manually pick up block-shaped impurities visible to the naked eye; the water washing treatment is mainly to remove construction solid waste such as slag that is difficult to sort manually; and the drying treatment is carried out by air drying at room temperature.

[0068] Further preferably, in step (2), the treated concrete solid waste raw materials do not contain steel bars, wood, plastics, foam boards, bricks, or paper waste.

[0069] Preferably, a belt conveyor and a first medium-speed bucket elevator are used in sequence to deliver the processed concrete solid waste raw materials into the lateral confining pressure-vertical loading crushing device.

[0070] In the present invention, there are no special requirements for the belt conveyor. For example, the belt conveyor has a length of 6m, a width of 0.8m, a load-bearing capacity of 0.5t, is capable of lifting and folding, supports forward and reverse rotation, has an Oxford sail belt, a thickened rubber belt, and uses an industrial cycloid copper core motor. The present invention will not be further described herein, and those skilled in the art should not be construed as limiting the present invention.

[0071] Further preferably, in step (3), the crushing treatment conditions at least meet the following conditions: vertical loading is performed at a loading speed of 1-10 KN / S, and unloading is performed when the load reaches 100-1000 KN.

[0072] More preferably, in step (3), the crushing treatment further satisfies the following conditions: when the load reaches 100-1000 kN, it lasts for 60 seconds.

[0073] Preferably, in step (3), the crushing process is carried out in a crushing component; the crushing component includes a loading column, a crushing cylinder, and a crushing bottom plate.

[0074] Further preferably, in the crushing member, the wall thickness of the crushing cylinder is 8 to 20 mm.

[0075] Preferably, in the crushing member, the diameter of the loading column is less than the inner diameter of the crushing drum, and the height of the loading column is equal to the height of the crushing drum.

[0076] More preferably, in step (3), the lateral confining pressure-vertical loading crushing device contains a vertical loading component capable of applying a vertical load; the load that can be applied by the vertical loading component ranges from 0 to 2000 kN.

[0077] Preferably, in step (3), the lateral confining pressure-vertical loading crushing device is 4.2 m away from the ground.

[0078] Preferably, in step (4), the conditions for the uniform stirring treatment at least meet the following requirements: the stirring time is 30 to 300 seconds, and the rotation speed of the stirring shaft is 30 to 90 r / min.

[0079] Further preferably, in step (4), the conditions for the uniform stirring treatment at least meet the following requirements: the power of the motor is 1.5 kW, and the voltage of the power supply is 380 V.

[0080] Preferably, in step (4), the mixing capacity of the fully enclosed forced mixer is 200 L, and the distance between the center of the fully enclosed forced mixer and the ground is 2.8 m, and the mixer is located directly below the lateral confining pressure-vertical loading crushing device, and the distance between the mixer and the center of the crushing component of the lateral confining pressure-vertical loading crushing device is 1.4 m.

[0081] Preferably, in step (5), the step screening process is carried out in the fully enclosed step screening device; the fully enclosed step screening device contains a step screening functional area; the step screening functional area adopts a non-standard vibrating screen, and the non-standard vibrating screen consists of 13 layers of square hole screens and a chassis; the outer diameter of the square hole screen is 1800 mm, the inner diameter of the square hole screen is 1720 mm, and the side length dimensions of the square hole screen are, from top to bottom, 37.5 mm, 31.5 mm, 26.5 mm, 19.0 mm, 16.0 mm, 9.50 mm, 4.75 mm, 2.36 mm, 1.18 mm, 0.60 mm, 0.30 mm, 0.15 mm, and 0.075 mm.

[0082] Preferably, in step (5), the chassis of the step screening functional area and each of the square hole screens in the step screening functional area are provided with a cylindrical discharge port, and the cylindrical discharge port is connected to the intelligent transfer functional area; and the screen of each of the square hole screens is provided with an inclination angle of 3° in the direction toward the cylindrical discharge port, to ensure that recycled aggregates of various particle size ranges can be smoothly transferred.

[0083] Further preferably, in step (5), the conditions of the step screening process at least meet the following requirements: a single screening amount of 2 to 50 kg, and a single screening time of 5 to 30 minutes.

[0084] More preferably, in step (5), the conditions of the step screening process also meet the following requirements: the screening amount that can be completed per day is ≥7.2t, and the process can be operated for 12h per day.

[0085] Preferably, in step (5), the fully enclosed step screening equipment is installed on the ground through a base and is located directly below the fully enclosed forced mixer, and the distance between the top cylindrical inlet of the step screening functional area and the bottom of the fully enclosed forced mixer is 0.5m.

[0086] Further preferably, the intelligent transfer functional area is located 1.5m below the ground, and the vertical distance between the feed port of the intelligent transfer functional area and the center of the cylindrical discharge port of the chassis of the step screening functional area is 0.5m.

[0087] Preferably, in step (6), the intelligent optimization process includes:

[0088] First, the recycled aggregate I is compared and calculated with the continuous-size aggregate grading target to obtain recycled aggregate I-2 and recycled aggregate I-1;

[0089] The recycled aggregate I-2 is delivered to the lateral confining pressure-vertical loading crushing device by a second medium-speed bucket elevator for secondary crushing, and is then subjected to secondary uniform stirring and secondary step screening in sequence to obtain recycled aggregate I-3 of continuous particle size;

[0090] After entering the intelligent transfer functional area, the recycled aggregate I-3 is mixed and optimized with the recycled aggregate I-1 to obtain recycled aggregate II of continuous particle size;

[0091] Wherein, the recycled aggregate I-2 is an aggregate with a particle size within the first particle size range of the recycled aggregate I; the first particle size range is selected from D1 ≥ 37.5 mm, 31.5 mm ≤ D2 < 37.5 mm, 26.5 mm ≤ D3 < 31.5 mm, 19.0 mm ≤ D4 < 26.5 mm, 16.0 mm ≤ D5 < 19.0 mm, 9.50 mm ≤ D6 < 16.0 mm, 4.75 mm ≤ D7 < 9.50 mm, 2.36 mm ≤ D8 < 4.75 mm, 1.18 mm ≤ D9 < 2.36 mm, 0.60 mm ≤ D 10 <1.18mm、0.30mm≤D 11 <0.60mm.

[0092] Further preferably, the recycled aggregate I-3 includes recycled aggregates of the maximum particle size of the recycled aggregate I-2 and all particle sizes below it and recycled fine powder.

[0093] Preferably, in step (6), the intelligent transfer functional area includes an intelligent control module, an automatic weighing module and a transfer and distribution module.

[0094] Further preferably, in step (6), the automatic weighing module includes 14 non-standard intelligent automatic checkweighers (using belt checkweighing), and the automatic checkweighers are connected to the 13-layer square hole screen and the cylindrical discharge port of the chassis in the fully enclosed cascade screening equipment; the intelligent control module is provided with a controller, and the controller performs a real-time comparison and balance calculation on the "current cumulative production data of each particle size aggregate" and the "continuous particle size aggregate grading target data", and guides the subsequent production and grading optimization of the recycled aggregate according to the calculation results to ensure dynamic balance between the recycled aggregates; the transfer and distribution module contains 14 temporary storage units, each of which contains a feed port a, a discharge port b and a discharge port c, wherein the discharge port b is connected to the lateral confining pressure-vertical loading crushing device, and the discharge port c is connected to the finished product storage functional area (the finished product storage functional area is located 3 meters below the ground, and the vertical distance between it and the discharge port c of the temporary storage unit is 0.5m).

[0095] According to a preferred embodiment, in step (7), the coarse aggregate silo is provided with 7 storage tanks, and the 7 storage tanks can respectively store coarse aggregates of the following particle size ranges: D1, D2, D3, D4, D5, D6, and D7;

[0096] The fine aggregate silo is equipped with 5 storage tanks, which can store fine aggregates of the following particle size ranges: D8, D9, D 10 、D 11 、D 12 ;

[0097] The micro powder silo is provided with two storage tanks, and the two storage tanks can store the following particle size ranges of recycled micro powder: D 13 、D 14 .

[0098] The present invention will be described in detail below through examples. In the following examples, unless otherwise specified, the raw materials are all commercially available.

[0099] In the following examples, unless otherwise specified, the concrete strength test block solid waste, concrete anti-permeability test block solid waste, cement strength test block solid waste, and mortar strength test block solid waste are obtained by performing destructive testing on the concrete strength test blocks, concrete anti-permeability test blocks, cement strength test blocks, and mortar strength test blocks, and before performing the destructive testing,

[0100] The original sizes of the concrete strength test blocks include: 100mm*100mm*100mm, 150mm*150mm*150mm, 200mm*200mm*200mm;

[0101] The original size of the concrete anti-seepage test block is: 175mm*185mm*150mm;

[0102] The original size of the cement strength test block is: 40mm*40mm*160mm;

[0103] The original size of the mortar strength test block is: 70.7mm*70.7mm*70.7mm.

[0104] In the following examples, unless otherwise specified, the belt conveyor is 6m long, 0.8m wide, has a load-bearing capacity of 0.5t, has lifting and folding functions, supports forward and reverse rotation, has Oxford sail belts, thickened rubber belts, and uses an industrial cycloid needle copper core motor.

[0105] The first and second medium-speed bucket elevators have an hourly output of 1-10t / h, a belt width of 20cm, a power of 1.5kw, and a squirrel cage type lower pulley to prevent the material from flowing into the bucket belt and being crushed by the wheel surface.

[0106] In the following examples, unless otherwise specified, in the lateral confining pressure-vertical loading crushing device, the crushing components include a loading pressure column, a crushing drum, and a crushing chassis; and the wall thickness of the crushing components is 12 mm, the diameter of the loading pressure column is 1 mm smaller than the inner diameter of the crushing drum, and the height of the loading pressure column = the height of the crushing drum, wherein the inner diameter of the crushing drum is 600 mm.

[0107] The lateral confining pressure-vertical loading crushing device comprises a vertical loading component capable of applying a vertical load; the load applied by the vertical loading component ranges from 0 to 2000 kN.

[0108] In the fully enclosed cascade screening equipment, the non-standard vibrating screen uses a vibrating motor with a shock-absorbing spring at the bottom. The screen frame and screen mesh are both made of 304 stainless steel.

[0109] In the finished product storage functional area, the storage tank is a conventional building material storage tank made of stainless steel, with a capacity of ≥10t and equipped with a feed port and a discharge port.

[0110] Example 1

[0111] This embodiment is used to provide a method for preparing continuous granularity recycled aggregate based on lateral confining pressure-vertical loading. Figure 1 and Figure 2 The process shown is carried out and includes:

[0112] (1) Collecting cement-based material performance test block solid waste generated during civil engineering construction and concrete solid waste generated during the demolition and reconstruction of civil engineering structures as concrete solid waste raw materials; the weight of the concrete solid waste raw materials is 40 kg;

[0113] The concrete solid waste generated by the demolition and reconstruction of the civil engineering structure has been pre-sorted to remove steel bars and large pieces of construction waste, and has been crushed in advance, and the macroscopic size of the concrete solid waste is less than 100 mm;

[0114] The cement-based material performance test block solid waste generated during the civil engineering construction process includes concrete strength test block solid waste, concrete anti-permeability test block solid waste, cement strength test block solid waste, and mortar strength test block solid waste, and the macroscopic size of the solid waste is <100mm.

[0115] (2) The above-mentioned concrete solid waste raw materials are manually sorted, washed, and dried in sequence to obtain processed concrete solid waste raw materials, and then the processed concrete solid waste raw materials are successively lifted to a height of 5.5 m above the ground by a belt conveyor and a first medium-speed bucket elevator, and are transferred under the action of gravity into the vertical loading component of the lateral confining pressure-vertical loading crushing device at a height of 4.2 m above the ground to obtain dense concrete solid waste raw materials;

[0116] The treated concrete solid waste raw materials do not contain common construction waste such as steel bars, wood, plastics, foam boards, bricks, and paperboards at construction sites;

[0117] The manual sorting is to manually pick up block impurities visible to the naked eye; the water washing treatment is mainly to remove construction solid waste such as slag that is difficult to sort manually; the drying treatment is carried out by air drying at room temperature.

[0118] (3) Every 5 minutes, the concrete solid waste material (10 kg / time) is fed into the crushing component (three-dimensional structure as shown in FIG) of the lateral confining pressure-vertical loading crushing device. Figure 3 As shown in the figure), the recycled mixed material I with continuous particle size is obtained;

[0119] The crushing process is controlled according to the maximum load, vertically loaded at a loading speed of 5 kN / s, and after reaching 1000 kN, it is continued for 60 seconds and then unloaded;

[0120] (4) The recycled mixed material I falls into a fully enclosed forced mixer under the action of gravity and is uniformly stirred to obtain a recycled mixed material II of continuous particle size; the conditions for the uniform stirring treatment are as follows: the stirring time is 120s, the speed of the stirring shaft is 45r / min, the power of the motor is 1.5kw, and the voltage of the power supply is 380V;

[0121] The mixing capacity of the fully enclosed forced mixer is 200L, and the distance between the center of the fully enclosed forced mixer and the ground is 2.8m. It is located directly below the lateral confining pressure-vertical loading crushing device, and the distance between the center of the crushing component of the lateral confining pressure-vertical loading crushing device is 1.4m.

[0122] (5) The recycled mixed material II enters the fully enclosed cascade screening equipment under the action of gravity for cascade screening to obtain recycled aggregate I with continuous particle size. For example, the recycled aggregate I has particle size ranges of D4, D5, D6, and D7. Figure 4 As shown, and the continuous particle size distribution diagram of the recycled aggregate I, as shown Figure 5 As shown;

[0123] Depend on Figure 4It can be seen that 11 particle size ranges of recycled aggregates were obtained, namely: D4, D5, D6, D7, D8, D9, D 10 、D 11 、D 12 、D 13 、D 14 Among them, the mass proportion of recycled aggregates in the particle size ranges of D6, D7 and D8 are all greater than 10%;

[0124] However, due to the particle size ranges of D9, D 10 、D 11 、D 12 The mass proportion of the recycled aggregate is relatively small, so the particle size ranges are D6, D7, and D8 respectively, and returned to the lateral confining pressure-vertical loading crushing device for secondary crushing treatment, so that the mass proportion of the recycled aggregate in the large particle size range in the obtained recycled aggregate I is relatively reduced, and the mass proportion of the recycled aggregate in the small particle size range is relatively increased, so as to achieve the purpose of regulating and optimizing the gradation.

[0125] The fully enclosed step screening equipment contains a step screening functional area (three-dimensional structure as shown in FIG. Figure 6 As shown), the stepped screening functional area adopts a non-standard vibrating screen, which consists of 13 layers of square hole screens and a chassis; the outer diameter of the square hole screen is 1800mm, the inner diameter of the square hole screen is 1720mm, and the side lengths of the square hole screen are as follows from top to bottom: 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 and inner diameters of the chassis are consistent with those of the square hole screen, and there is no sieve hole in the chassis. Its function is to receive the smallest recycled powder;

[0126] The chassis of the step screening functional area and each of the square hole screens in the step screening functional area are provided with a cylindrical discharge port, and the cylindrical discharge port is connected to the intelligent transfer functional area; and the screen of each square hole screen is provided with a 3° inclination angle in the direction toward the cylindrical discharge port, ensuring that recycled aggregates of various particle sizes can be smoothly transferred;

[0127] The conditions of the step screening process are as follows: a single screening amount of 50 kg, a single screening time of 5 minutes, a screening amount that can be completed every day of ≥ 7.2 tons, and a daily operation time of 12 hours;

[0128] The fully enclosed step screening equipment is installed on the ground through a base and is located directly below the fully enclosed compulsory mixer, and the distance between the top cylindrical feeding port of the step screening functional area and the bottom of the fully enclosed compulsory mixer is 0.5m;

[0129] The intelligent transfer functional area is located 1.5m below the ground, and the vertical distance between the feed port of the intelligent transfer functional area and the center of the cylindrical discharge port of the chassis of the step screening functional area is 0.5m.

[0130] (6) The recycled aggregate I enters the intelligent transfer functional area under the action of gravity for intelligent optimization processing;

[0131] The intelligent optimization process is as follows:

[0132] First, the recycled aggregate I is compared and calculated with the continuous-size aggregate grading target, and recycled aggregates with size ranges of D6, D7, and D8 are separated from the recycled aggregate I, which are recorded as recycled aggregate I-2, and the remaining is recycled aggregate I-1. After intelligent calculation, the mass of the recycled aggregate with size range D6 in the recycled aggregate I-2 is 2 kg, the mass of the recycled aggregate with size range D7 is 4 kg, and the mass of the recycled aggregate with size range D8 is 2 kg.

[0133] The recycled aggregate I-2 is returned to the lateral confining pressure-vertical loading crushing device by a second medium-speed bucket elevator for secondary crushing, and is then subjected to secondary uniform stirring and secondary step screening in sequence to obtain recycled aggregate I-3 of continuous particle size;

[0134] After entering the intelligent transfer functional area, the recycled aggregate I-3 is mixed and optimized with the recycled aggregate I-1 to obtain recycled aggregate II of continuous particle size;

[0135] The recycled aggregate I-3 includes particle sizes of D6, D7, D8, D9, D 10 、D 11 、D 12 、D 13 、D 14 Recycled aggregate, and recycled powder; the continuous particle size distribution diagram of the recycled aggregate I-3, as shown Figure 7 As shown;

[0136] Depend on Figure 7 It can be seen that among the recycled aggregate I-3, the mass proportion of the recycled aggregate with a particle size range of D9 is 11.84%, the mass proportion of the recycled aggregate with a particle size range of D10 is 8.76%, the mass proportion of the recycled aggregate with a particle size range of D11 is 9.19%, and the mass proportion of the recycled aggregate with a particle size range of D12 is 6.85%.

[0137] The continuous particle size optimization comparison of the recycled aggregate I and the recycled aggregate II is as follows: Figure 8 As shown;

[0138] Depend on Figure 8 It can be seen that in the recycled aggregate I, the mass proportion of the recycled aggregate with particle size ranges of D6, D7, and D8 is effectively reduced, while the mass proportion of the recycled aggregate with particle size ranges of D9, D 10 、D 11 、D 12 The quality proportion of recycled aggregate has been significantly improved, which shows that the grading of recycled aggregate has been adjusted and optimized.

[0139] The intelligent transfer functional area includes an intelligent control module, an automatic weighing module and a transfer and distribution module;

[0140] Among them, the automatic weighing module includes 14 non-standard intelligent automatic checkweighers (using belt checkweighing), and the automatic checkweighers are connected to the 13-layer square hole screen and the cylindrical discharge port of the chassis in the fully enclosed cascade screening equipment; the intelligent control module is provided with a controller, and the controller performs real-time comparison and balance calculation on the "current accumulated production data of each particle size aggregate" and the "continuous particle size aggregate grading target data", and guides the subsequent production and grading optimization of the recycled aggregate based on the calculation results to ensure dynamic balance between the recycled aggregates; the transfer and distribution module contains 14 temporary storage units, each of which has a feed port a, a discharge port b and a discharge port c, wherein the discharge port b is connected to the lateral confining pressure-vertical loading crushing device, and the discharge port c is connected to the finished product storage functional area (the finished product storage functional area is located 3 meters below the ground, and the vertical distance between it and the discharge port c of the temporary storage unit is 0.5m);

[0141] (7) When the recycled aggregate II of the continuous particle size reaches the stage production target, it is transported to the coarse aggregate silo, fine aggregate silo or micro-powder silo in the finished product storage functional area to obtain recycled aggregate III of the continuous particle size;

[0142] The coarse aggregate silo is provided with 7 storage tanks, and the 7 storage tanks can respectively store coarse aggregates of the following particle size ranges: D1, D2, D3, D4, D5, D6, and D7;

[0143] The fine aggregate silo is equipped with 5 storage tanks, which can store fine aggregates of the following particle size ranges: D8, D9, D 10 、D 11 、D 12 ;

[0144] The micro powder silo is provided with two storage tanks, and the two storage tanks can store the following particle size ranges of recycled micro powder: D 13 、D 14 .

[0145] Example 2

[0146] This example is carried out according to the method in Example 1, except that in step (3), the recycled aggregate with a particle size range of D4 (10 kg / time) is fed into the lateral confining pressure-vertical loading crushing device every 5 minutes for the crushing process;

[0147] In step (5), the particle size range of the recycled aggregate I includes: D4, D5, D6, D7, D8, D9, D 10 、D 11 、D 12 、D 13 、D 14 ;

[0148] And the continuous particle size distribution diagram of the recycled aggregate I is as follows: Figure 9 As shown,

[0149] Depend on Figure 9 It can be seen that the mass proportion of recycled aggregate with a particle size range of D4 is 2.13%, and the mass proportions of recycled aggregate with a particle size range of D6, D7, D8 and D9 are all >10%, among which the mass proportion of recycled aggregate with a particle size range of D7 reaches 22.37%.

[0150] The remaining conditions and parameters are the same as in Example 1.

[0151] Example 3

[0152] This example is carried out according to the method in Example 1, except that in step (3), the recycled aggregate with a particle size range of D5 (10 kg / time) is fed into the lateral confining pressure-vertical loading crushing device every 5 minutes for the crushing process;

[0153] In step (5), the particle size range of the recycled aggregate I includes: D5, D6, D7, D8, D9, D 10 、D 11 、D 12 、D 13 、D 14 ;

[0154] And the continuous particle size distribution diagram of the recycled aggregate I is as follows: Figure 10 As shown,

[0155] Depend on Figure 10 It can be seen that the mass proportion of recycled aggregate with a particle size range of D5 is 3.37%, and the mass proportions of recycled aggregate with a particle size range of D6, D7, D8 and D9 are all >10%, among which the mass proportion of recycled aggregate with a particle size range of D6 reaches 24.63%.

[0156] The remaining conditions and parameters are the same as in Example 1.

[0157] Example 4

[0158] This example is carried out according to the method in Example 1, except that in step (3), the recycled aggregate with a particle size range of D6 (10 kg / time) is fed into the lateral confining pressure-vertical loading crushing device every 5 minutes for the crushing process;

[0159] In step (5), the particle size range of the recycled aggregate I includes: D6, D7, D8, D9, D 10 、D 11 、D 12 、D 13 、D 14 ;

[0160] And the continuous particle size distribution diagram of the recycled aggregate I is as follows: Figure 11 As shown,

[0161] Depend on Figure 11 It can be seen that the mass proportion of recycled aggregate with particle size range of D6 is 17.58%, and the mass proportions of recycled aggregate with particle size ranges of D7, D8 and D9 are all >10%, among which the mass proportion of recycled aggregate with particle size range of D7 reaches 27.32%.

[0162] The remaining conditions and parameters are the same as in Example 1.

[0163] Example 5

[0164] This example is carried out according to the method in Example 1, except that in step (3), the recycled aggregate with a particle size range of D7 (10 kg / time) is fed into the lateral confining pressure-vertical loading crushing device every 5 minutes for the crushing process;

[0165] In step (5), the particle size range of the recycled aggregate I includes: D7, D8, D9, D 10 、D 11 、D 12 、D 13 、D 14 ;

[0166] And the continuous particle size distribution diagram of the recycled aggregate I is as follows: Figure 12 As shown,

[0167] Depend on Figure 12 It can be seen that the mass proportion of recycled aggregate with a particle size range of D7 is 29.36%, and the particle size ranges are D8, D 11 The mass proportion of recycled aggregates is greater than 10%, and the mass proportion of recycled aggregates with a particle size range of D8 is 22.27%.

[0168] The remaining conditions and parameters are the same as in Example 1.

[0169] Example 6

[0170] This example is carried out according to the method in Example 1, except that in step (3), the recycled aggregate with a particle size range of D8 (10 kg / time) is fed into the lateral confining pressure-vertical loading crushing device for the crushing process every 5 minutes;

[0171] In step (5), the particle size range of the recycled aggregate I includes: D8, D9, D 10 、D 11 、D 12 、D 13 、D 14 ;

[0172] And the continuous particle size distribution diagram of the recycled aggregate I is as follows: Figure 13 As shown,

[0173] Depend on Figure 13 It can be seen that the mass of recycled aggregate with a particle size range of D8 accounts for 37.57%, and the particle size ranges are D9, D 10 、D 11 The mass proportion of recycled aggregates is greater than 10%, among which the mass proportion of recycled aggregates with particle size range of D9 is 18.75%.

[0174] The remaining conditions and parameters are the same as in Example 1.

[0175] Example 7

[0176] This example is carried out in accordance with the method of Example 1, except that in step (3), the recycled aggregate with a particle size range of D9 (10 kg / time) is fed into the lateral confining pressure-vertical loading crushing device for the crushing process every 5 minutes;

[0177] In step (5), the particle size range of the recycled aggregate I includes: D9, D 10 、D 11 、D 12 、D 13 、D 14 ;

[0178] And the continuous particle size distribution diagram of the recycled aggregate I is as follows: Figure 14 As shown,

[0179] Depend on Figure 14 It can be seen that the mass proportion of recycled aggregate with a particle size range of D9 reaches 55.17%, and the particle size ranges are D 10 、D 11 、D 13 The mass proportion of recycled aggregate is greater than 10%.

[0180] The remaining conditions and parameters are the same as in Example 1.

[0181] Example 8

[0182] This example is carried out in accordance with the method in Example 1, except that in step (3), the particle size range D is changed every 5 minutes. 10 The recycled aggregate (10 kg / time) is fed into the lateral confining pressure-vertical loading crushing device for the crushing process;

[0183] In step (5), the particle size range of the recycled aggregate I includes: D 10 、D 11 、D 12 、D 13 、D 14 ;

[0184] And the continuous particle size distribution diagram of the recycled aggregate I is as follows: Figure 15 As shown,

[0185] Depend on Figure 15 It can be seen that the particle size range is D 10 The recycled aggregate accounts for 42.54% of the total mass, with the particle size range of D 11 、D 12 、D 13 The mass proportion of recycled aggregate is greater than 10%.

[0186] The remaining conditions and parameters are the same as in Example 1.

[0187] Example 9

[0188] This example is carried out in accordance with the method in Example 1, except that in step (3), the particle size range D is changed every 5 minutes. 11 The recycled aggregate (10 kg / time) is fed into the lateral confining pressure-vertical loading crushing device for the crushing process;

[0189] In step (5), the particle size range of the recycled aggregate I includes: D 11 、D 12 、D 13 、D 14 ;

[0190] And the continuous particle size distribution diagram of the recycled aggregate I is as follows: Figure 16 As shown,

[0191] Depend on Figure 16 It can be seen that the particle size range is D 11 The recycled aggregate accounts for 41.84% of the total mass, with the particle size ranges of D 12 、D 13 The mass proportion of recycled aggregate is greater than 10%.

[0192] The remaining conditions and parameters are the same as in Example 1.

[0193] Example 10

[0194] This example is carried out in accordance with the method in Example 1, except that in step (3), the particle size range D is changed every 5 minutes. 12 The recycled aggregate (10 kg / time) is fed into the lateral confining pressure-vertical loading crushing device for the crushing process;

[0195] In step (5), the particle size range of the recycled aggregate I includes: D 12 、D 13 、D 14 ;

[0196] And the continuous particle size distribution diagram of the recycled aggregate I is as follows: Figure 17 As shown,

[0197] Depend on Figure 17 It can be seen that the particle size range is D 12 The recycled aggregate accounts for 46.80% of the total mass, with a particle size range of D 13 The mass proportion of recycled aggregate is 50.74%.

[0198] The remaining conditions and parameters are the same as in Example 1.

[0199] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, various simple variations of the technical solution of the present invention may be made, including combining the various technical features in any other appropriate manner. These simple variations and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. A method for preparing continuously sized recycled aggregate based on lateral confining pressure-vertical loading, characterized in that: The method includes: (1) Collecting concrete solid waste raw materials; (2) pre-treating the concrete solid waste raw material to obtain treated concrete solid waste raw material; (3) The treated concrete solid waste raw materials are sent to a lateral confining pressure-vertical loading crushing device for crushing to obtain a recycled mixed material I; the crushing process is carried out in a crushing component; the crushing component includes a loading pressure column, a crushing cylinder, and a crushing chassis; (4) The recycled mixture I enters a fully enclosed forced mixer under the action of gravity for uniform stirring to obtain recycled mixture II; (5) The recycled mixture II enters a fully enclosed cascade screening device under the action of gravity for cascade screening to obtain recycled aggregate I of continuous particle size; (6) The recycled aggregate I enters the intelligent transfer functional area under the action of gravity for intelligent optimization processing to obtain recycled aggregate II of continuous particle size; (7) When the recycled aggregate II reaches the stage production target, it is transported to the coarse aggregate silo, fine aggregate silo or micro-powder silo in the finished product storage functional area to obtain recycled aggregate III of continuous particle size; The intelligent optimization process includes: First, the recycled aggregate I is compared and calculated with the continuous-size aggregate grading target to obtain recycled aggregate I-2 and recycled aggregate I-1; The recycled aggregate I-2 is delivered to the lateral confining pressure-vertical loading crushing device by a second medium-speed bucket elevator for secondary crushing, and is then subjected to secondary uniform stirring and secondary step screening in sequence to obtain recycled aggregate I-3 of continuous particle size; After entering the intelligent transfer functional area, the recycled aggregate I-3 is mixed and optimized with the recycled aggregate I-1 to obtain recycled aggregate II of continuous particle size; The recycled aggregate I-2 is an aggregate with a particle size within the first particle size range of the recycled aggregate I; the first particle size range is selected from at least one of D1 ≥ 37.5 mm, 31.5 mm ≤ D2 < 37.5 mm, 26.5 mm ≤ D3 < 31.5 mm, 19.0 mm ≤ D4 < 26.5 mm, 16.0 mm ≤ D5 < 19.0 mm, 9.50 mm ≤ D6 < 16.0 mm, 4.75 mm ≤ D7 < 9.50 mm, 2.36 mm ≤ D8 < 4.75 mm, 1.18 mm ≤ D9 < 2.36 mm, 0.60 mm ≤ D10 < 1.18 mm, and 0.30 mm ≤ D11 < 0.60 mm.

2. The method according to claim 1, wherein In step (2), the pretreatment includes manual sorting, water washing, and drying.

3. The method according to claim 1 or 2, wherein: In step (3), the crushing treatment conditions at least meet the following requirements: vertical loading at a loading speed of 1-10 kN / s, and unloading when the load reaches 100-1000 kN.

4. The method according to any one of claims 1 to 3, wherein: In step (3), in the crushing member, the wall thickness of the crushing cylinder is 8 to 20 mm; And / or, in the crushing member, the diameter of the loading column is less than the inner diameter of the crushing drum, and the height of the loading column is equal to the height of the crushing drum.

5. The method according to any one of claims 1 to 4, wherein: In step (3), the lateral confining pressure-vertical loading crushing device contains a vertical loading component that can apply a vertical load; the load range that can be applied by the vertical loading component is 0-2000KN.

6. The method according to any one of claims 1 to 5, wherein: In step (4), the conditions for the uniform stirring treatment at least meet the following requirements: the stirring time is 30 to 300 seconds, and the stirring shaft speed is 30 to 90 rpm; And / or, in step (4), the conditions for the uniform stirring treatment at least meet the following conditions: the power of the motor is 1.5 kW, and the voltage of the power supply is 380 V.

7. The method according to any one of claims 1 to 6, wherein in step (5), the step screening process is carried out in the fully enclosed step screening device; the fully enclosed step screening device contains a step screening functional area; the step screening functional area uses a non-standard vibrating screen, and the non-standard vibrating screen consists of 13 layers of square hole screens and a chassis; the outer diameter of the square hole screen is 1800 mm, the inner diameter of the square hole screen is 1720 mm, and the side lengths of the square hole screen are, from top to bottom, 37.5 mm, 31.5 mm, 26.5 mm, 19.0 mm, 16.0 mm, 9.50 mm, 4.75 mm, 2.36 mm, 1.18 mm, 0.60 mm, 0.30 mm, 0.15 mm, and 0.075 mm; And / or, in step (5), the conditions of the step screening process at least meet the following requirements: a single screening amount of 2 to 50 kg, and a single screening time of 5 to 30 minutes.

8. The method according to any one of claims 1 to 7, wherein in step (6), the intelligent transfer functional area includes an intelligent control module, an automatic weighing module and a transfer and distribution module.

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