阅读说明：本技术 废旧沥青路面材料破碎筛分、回收系统及筛分、回收方法 (Waste asphalt pavement material crushing, screening and recycling system and screening and recycling method ) 是由 郭德栋 陈颖 黄军瑞 蔡晨龙 胡勤帅 于 2021-09-14 设计创作，主要内容包括：本发明涉及一种废旧沥青路面材料破碎筛分及沥青回收系统及一种废旧沥青路面材料破碎筛分及沥青回收方法,包括破碎分离系统、热处理系统、集料初步处理系统、集料二次处理系统和废液及沥青回收系统。本发明有益效果是：1.集料二次处理系统可以实现集料与洗涤液的自动分离,减少洗涤液对人体的伤害；2.能够较为彻底的去除集料表面包裹的沥青,使集料和沥青均可再利用,节约能源；3.能够实现洗涤液的回收、处理及循环利用设备简单,经济性强；4.能够筛分粗、细集料,利于集料的二次使用；5.破碎分离系统实现了快速破碎和初步分离,效率较高,避免了路面铣刨后,集料摩擦导致沥青软化,造成仪器堵塞。(The invention relates to a waste asphalt pavement material crushing, screening and asphalt recycling system and a waste asphalt pavement material crushing, screening and asphalt recycling method. The invention has the beneficial effects that: 1. the secondary aggregate treatment system can realize the automatic separation of aggregate and washing liquid, and reduce the damage of the washing liquid to human bodies; 2. the asphalt wrapped on the surface of the aggregate can be removed more thoroughly, so that the aggregate and the asphalt can be reused, and energy is saved; 3. the washing liquid can be recycled, treated and recycled, and the equipment is simple and high in economy; 4. coarse and fine aggregates can be screened, and secondary use of the aggregates is facilitated; 5. the crushing and separating system realizes quick crushing and preliminary separation, has high efficiency, and avoids the problems that the asphalt is softened due to the friction of aggregate after the pavement is milled and milled, and instruments are blocked.)

1. The utility model provides a broken screening of old and useless bituminous paving material and pitch recovery system which characterized in that includes:

the crushing and separating system (1) is used for crushing the waste asphalt pavement aggregate and primarily separating asphalt from the waste;

the heat treatment system (2) is used for heating and drying the aggregate treated by the crushing and separating system (1);

an aggregate primary treatment system (3) for separating the aggregate treated by the heat treatment system (2) and washing the fine aggregate obtained after separation in trichloroethylene;

an aggregate secondary treatment system (4) for performing solid-liquid separation on the aggregate washed by the aggregate primary treatment system (3); and

and a waste liquid and asphalt recovery system (5) for separating and recovering the waste liquid separated by the aggregate secondary treatment system (4).

2. The system for crushing, screening and recycling asphalt from waste asphalt pavement materials according to claim 1, wherein the crushing and separating system (1) comprises a crusher (1-2) for crushing the asphalt pavement aggregates and a high-pressure water gun (1-1) for stripping the asphalt from the asphalt pavement aggregates.

3. The used asphalt pavement material crushing, screening and asphalt recycling system according to claim 1, wherein the heat treatment system (2) comprises a conveyor belt (2-1) for transporting the aggregate treated by the crushing and separating system (1), and a heating plate (2-2) and a hot air blower (2-3) for heating and drying the aggregate on the conveyor belt (2-1).

4. The system for crushing, screening and recycling asphalt from waste asphalt pavement materials according to claim 1, wherein the aggregate primary treatment system (3) comprises a receiving bin (3-1), and an inclined aggregate separation screen (3-2) is arranged in the receiving bin (3-1); a coarse aggregate outlet (3-3) is arranged on the wall of the upper part of the connection part of the receiving bin (3-1) and the lowest end of the aggregate separation screen (3-2); the material receiving bin (3-1) is a cylindrical expansion part (3-5) with the middle lower part protruding outwards to form a ring; the lower part of the expansion part (3-5) is provided with a material receiving net (3-6); a compression spring (3-7) is fixed on the material receiving net (3-6); the upper end of the compression spring (3-7) is provided with a material holding umbrella (3-8), the material holding umbrella (3-8) is in an umbrella cover shape with a downward opening, and the diameter of the edge of the opening is larger than that of the cylindrical part of the material receiving bin (3-1) and smaller than the maximum diameter of the expanded part (3-5) of the material receiving bin (3-1); under the state that the compression spring (3-7) only bears the material bearing umbrella (3-8), the edge of the material bearing umbrella (3-8) extends into the expansion part (3-5), and the space between the material bearing umbrella (3-8) and the material receiving bin (3-1) is pressed by the compression spring (3-7).

5. The system for crushing, screening and recycling asphalt from waste asphalt pavement materials according to claim 4, wherein the material receiving bin (3-1) is provided with a funnel-shaped mixing bin (3-4) which is opened upwards below the material receiving net (3-6).

6. The system for crushing, screening and recycling asphalt from waste asphalt pavement materials according to claim 5, wherein the material holding umbrellas (3-8) are thicker at the center and thinner towards the edges.

7. The system for crushing, screening and recycling asphalt from waste asphalt pavement materials according to claim 1, wherein the aggregate secondary treatment system (4) receives a mixture of fine aggregates and trichloroethylene extracted from the bottom of the mixing bin (3-4) by a fine particle circulator (3-7), and then performs solid-liquid separation.

8. The waste asphalt pavement material crushing, screening and asphalt recycling system according to claim 1, wherein the waste liquid and asphalt recycling system (5) is used for receiving the liquid separated by the aggregate secondary treatment system (4), separating asphalt and trichloroethylene in the liquid, and recycling the separated asphalt; the separated trichloroethylene is conveyed to a mixing bin (3-4) for reuse.

9. A method for crushing, screening and recycling asphalt from waste asphalt pavement materials, which is characterized in that the recycling system of claims 1-8 is used, and comprises the following steps:

s1, placing the waste road pavement aggregate scraped from the pavement into a crushing and separating system (1), crushing the large aggregate and stripping asphalt on the surface of the aggregate under the action of a high-pressure water gun (1-1) and a crusher (1-2);

s2, driving the aggregate treated in the step S1 by a conveyor belt (2-1) of a heat treatment system (2), and heating and drying under the action of a heating plate (2-2) and a hot air blower (2-3);

s3, dropping the dried aggregate onto an aggregate separation screen (3-2) in a receiving bin (3-1) of an aggregate primary treatment system (3), rolling the aggregate with large particle size downwards along the inclined aggregate separation screen (3-2), and finally rolling out from a coarse aggregate outlet (3-3); the aggregate with small particle size falls from the aggregate separation screen (3-2) and is mixed and soaked with trichloroethylene in the mixing bin (3-4);

s4, soaking the fine aggregate in the mixing bin (3-4), and conveying the fine aggregate to the aggregate secondary treatment system (4) by the fine particle circulating machine (3-7) for solid-liquid separation;

s5, the liquid separated in the step S4 enters a waste liquid and asphalt recovery system (5), asphalt and trichloroethylene in the liquid are separated, and the separated asphalt is recycled; the separated trichloroethylene is conveyed to a mixing bin (3-4) for reuse.

10. The method for crushing, screening and recycling the waste asphalt pavement materials according to claim 9, wherein the aggregates with small particle size fall from the aggregate separation screen (3-2) in step S3 and then fall onto the material holding umbrella (3-8), and as the weight of the materials on the material holding umbrella (3-8) increases, the compression spring (3-7) is pressed to deform, so that the material holding umbrella (3-8) is separated from the material receiving bin (3-1), and the aggregates slide down the material holding umbrella (3-8); along with the weight reduction of the materials on the material bearing umbrella (3-8), the compression spring (3-7) deforms, so that the material bearing umbrella (3-8) and the material receiving bin (3-1) are pressed tightly, and the aggregate stops falling; one part of the aggregate sliding down the material-holding umbrella (3-8) directly enters the mixing bin (3-4), and the other part of the aggregate is buffered by the material-holding net (3-6) and then falls into trichloroethylene in the mixing bin (3-4) for mixing and soaking.

Technical Field

The invention relates to the field related to road construction, in particular to a system and a method for crushing, screening and recovering waste asphalt pavement materials.

Background

With the continuous development of economy, the construction scale of asphalt pavements in China is gradually increased. Asphalt is a dark brown complex mixture composed of hydrocarbons with different molecular weights and nonmetallic derivatives thereof, is one of high-viscosity organic liquids, and mostly exists in a liquid or semisolid petroleum form. Asphalt is a pavement structure cementing material widely applied in road engineering, asphalt materials with certain viscosity and proper dosage are matched with mineral aggregates with certain gradation in proportion to build asphalt pavements with different structures, the aggregates are the general name of mineral aggregates in the asphalt pavement materials, play a role of frameworks and filling in the pavement materials, sometimes need to mix a plurality of coarse and fine aggregates to form the required granularity gradation, and the asphalt pavements are widely applied to expressways. In the process of long-term use of the asphalt pavement, the phenomena of asphalt aging, aggregate peeling and the like are caused along with the effects of natural conditions such as heat, oxygen, sunlight, water and the like and the action of driving load, so that the performance of the asphalt pavement is reduced, and various pavement diseases are generated. In order to better ensure the driving safety and the driving comfort, relevant departments can take measures to repair the road surface. In recent years, with the increasing awareness of environmental protection, the development of pavement recycling technology is fast, and the pavement recycling technology relates to milling, crushing and screening of old pavement asphalt mixture and recycling of old asphalt, wherein the crushing and screening of old materials influence key factors of mix proportion design.

At present, the asphalt mixture recovery of old pavements mainly adopts a milling mode, and can generate large friction with machinery in the crushing and screening processes, and the heat generated by the friction can influence the stripping of asphalt and aggregate. The heat generated by friction can soften the asphalt, which is easily adhered to instruments and screens after softening, causing damage to the machine. At the same time, the equipment for crushing and recycling old asphalt pavements currently available on the market has many drawbacks. Most of the devices are single, separation and recovery of aggregate and asphalt cannot be synchronous, liquid-solid separation is realized by adopting a heating method, and asphalt still adheres to the crushed stone after the separation of the asphalt and the crushed stone is finished. A small number of detergents are adopted to recover asphalt, but improper treatment of the washed recovery liquid causes resource waste and environmental pollution, or the processes are multiple, the process is complex, and the equipment and equipment operation cost is far higher than the economic cost of waste asphalt.

Therefore, in order to solve the problem that the asphalt is softened to cause the blockage of instruments and screens after aggregate friction generates heat, realize the integrated functions of crushing and recovery, simultaneously realize the purposes of recycling the washing liquid, improving the resource utilization efficiency and protecting the environment, a waste asphalt crushing and screening and asphalt recovery system and a waste asphalt crushing and screening and asphalt recovery method are necessary.

Disclosure of Invention

In view of the above, the invention provides a waste asphalt pavement material crushing, screening and recycling system and a screening and recycling method, and aims to solve the problems in the prior art.

A crushing screening and asphalt recycling system for waste asphalt pavement materials comprises:

the crushing and separating system is used for crushing the waste asphalt pavement aggregate and primarily separating asphalt from the waste;

the heat treatment system is used for heating and drying the aggregate treated by the crushing and separating system;

an aggregate primary treatment system for separating the aggregate treated by the heat treatment system and washing the fine aggregate obtained after separation in trichloroethylene;

the aggregate secondary treatment system is used for carrying out solid-liquid separation on the aggregate washed by the aggregate primary treatment system;

and

and the waste liquid and asphalt recovery system is used for separating and recovering waste liquid separated by the aggregate secondary treatment system.

On the basis of the scheme, the crushing and separating system comprises a crusher for crushing the asphalt pavement aggregate and a high-pressure water gun for stripping asphalt on the asphalt pavement aggregate.

On the basis of the scheme, the heat treatment system comprises a conveyor belt for conveying the aggregate treated by the crushing and separating system, and a heating plate and a hot air blower for heating and drying the aggregate on the conveyor belt.

On the basis of the scheme, the aggregate primary treatment system comprises a material receiving bin, wherein an inclined aggregate separation screen is arranged in the material receiving bin; a coarse aggregate outlet is arranged on the wall of the upper part of the connection part of the receiving bin and the lowest end of the aggregate separation screen; the material receiving bin is a cylindrical expansion part, and the middle lower part of the material receiving bin is outwards convex to form a ring; the lower part of the expansion part is provided with a material receiving net; a compression spring is fixed on the material receiving net; the upper end of the compression spring is provided with a material holding umbrella which is in an umbrella cover shape with a downward opening, and the diameter of the edge of the opening is larger than that of the cylindrical part of the material receiving bin and smaller than the maximum diameter of the expanded part of the material receiving bin; under the state that the compression spring only bears the material bearing umbrella, the edge of the material bearing umbrella extends into the expansion part, and the material bearing umbrella and the material receiving bin are tightly pressed by the compression spring.

On the basis of the scheme, the material receiving bin is provided with a funnel-shaped mixing bin which is opened upwards below the material receiving net.

On the basis of the scheme, the material-holding umbrella is thick in the center and thinner towards the edge.

On the basis of the scheme, the aggregate secondary treatment system receives the mixture of the fine aggregate and the trichloroethylene extracted from the bottom of the mixing bin by the fine particle circulating machine, and then performs solid-liquid separation.

On the basis of the scheme, the waste liquid and asphalt recovery system is used for receiving the liquid separated by the aggregate secondary treatment system, separating asphalt and trichloroethylene in the liquid, and recovering and reusing the separated asphalt; and conveying the separated trichloroethylene to a mixing bin for reuse.

A method for crushing, screening and recycling waste asphalt pavement materials comprises the following steps:

s1, placing the waste road pavement aggregate shoveled from the pavement into a crushing and separating system, crushing the large aggregate and stripping asphalt on the surface of the aggregate under the action of a high-pressure water gun and a crusher;

s2, the aggregate processed in the step S1 is driven by a conveyor belt of a heat treatment system and is heated and dried under the action of a heating plate and a hot air blower;

s3, dropping the dried aggregate onto an aggregate separation screen in a receiving bin of the aggregate primary treatment system, rolling the aggregate with large particle size downwards along the inclined aggregate separation screen, and finally rolling out from a coarse aggregate outlet; the aggregate with small particle size falls from the aggregate separation screen and is mixed and soaked with trichloroethylene in the mixing bin;

s4, soaking the fine aggregate in the mixing bin, and conveying the fine aggregate to an aggregate secondary treatment system by a fine particle circulating machine for solid-liquid separation;

s5, enabling the liquid separated in the step S4 to enter a waste liquid and asphalt recovery system, separating asphalt and trichloroethylene in the liquid, and recovering and recycling the separated asphalt; and conveying the separated trichloroethylene to a mixing bin for reuse.

On the basis of the scheme, in the step S3, after falling from the aggregate separation screen, the aggregate with small particle size falls onto the material bearing umbrella, and the compression spring is pressed to deform along with the increase of the weight of the material on the material bearing umbrella, so that the material bearing umbrella is separated from the material receiving bin, and the aggregate slides down the material bearing umbrella; along with the weight reduction of the materials on the material bearing umbrella, the compression spring deforms, so that the material bearing umbrella and the material receiving bin are tightly pressed, and the aggregate stops falling; one part of the aggregate sliding down the material-holding umbrella directly enters the mixing bin, and the other part of the aggregate is buffered by the material-holding net and then falls into trichloroethylene in the mixing bin for mixing and soaking.

The invention has the beneficial effects that: 1. the secondary aggregate treatment system can realize the automatic separation of aggregate and washing liquid, and reduce the damage of the washing liquid to human bodies; 2. the asphalt wrapped on the surface of the aggregate can be removed more thoroughly, so that the aggregate and the asphalt can be reused, and energy is saved; 3. the washing liquid can be recycled, treated and recycled, and the equipment is simple and high in economy; 4. coarse and fine aggregates can be screened, and secondary use of the aggregates is facilitated; 5. the crushing and separating system realizes quick crushing and preliminary separation, has high efficiency, and avoids the problems that the asphalt is softened due to the friction of aggregate after the pavement is milled and milled, and instruments are blocked.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a schematic structural diagram of a system for crushing, screening and recycling waste asphalt pavement materials according to the patent;

fig. 2 is a schematic structural diagram of an aggregate primary treatment system in the embodiment of the patent.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Example 1

As shown in fig. 1, a system for crushing, screening and recycling asphalt from waste asphalt pavement materials comprises:

the crushing and separating system 1 is used for crushing the waste asphalt pavement aggregate and primarily separating asphalt from the waste;

the heat treatment system 2 is used for heating and drying the aggregate treated by the crushing and separating system 1;

an aggregate primary treatment system 3 for screening and washing the aggregate transferred from the heat treatment system 2;

an aggregate secondary treatment system 4 for performing solid-liquid separation on the aggregate washed by the aggregate primary treatment system 3;

and

and a waste liquid and asphalt recycling system 5 for separating and recycling the waste liquid separated by the aggregate secondary treatment system 4.

Specifically, the crushing and separating system 1 comprises a crusher 1-2 for crushing the asphalt pavement aggregate and a high-pressure water gun 1-1 for stripping asphalt from the crushed asphalt pavement aggregate. The crusher 1-2 may use a jaw crusher. The high-pressure water gun 1-1 acts on a crushing plate of the crusher 1-2, and the design has the advantages that: the high-pressure water gun 1-1 can strip asphalt on the surface of the crushed mixture under the action of pressure, can clean and cool the mixture and the asphalt, and avoids the phenomenon that the asphalt is softened by heat generated by friction with machinery in the crushing and screening process of a milled road surface, adheres to instruments and screens and damages equipment.

Specifically, the heat treatment system 2 comprises a conveyor belt 2-1 for conveying the aggregate treated by the crushing and separating system 1, a heating plate 2-2 and a hot air blower 2-3 for heating and drying the aggregate on the conveyor belt 2-1.

Specifically, the aggregate primary treatment system 3 is used for separating the aggregates treated by the heat treatment system 2, and soaking the fine aggregates obtained after separation in trichloroethylene.

Specifically, the aggregate primary treatment system 3 comprises a receiving bin 3-1, and an inclined aggregate separation screen 3-2 is arranged in the receiving bin 3-1; a coarse aggregate outlet 3-3 is arranged on the wall of the upper part of the connection part of the receiving bin 3-1 and the lowest end of the aggregate separation screen 3-2; the material receiving bin 3-1 is cylindrical, and an expansion part 3-5 which is convex outwards at the middle lower part and is annular is arranged at the middle lower part; the lower part of the expansion part 3-5 is provided with a material receiving net 3-6; the material receiving net 3-6 can buffer the aggregate particles to a certain extent after the aggregate particles fall down, so that the speed of the aggregate particles entering the trichloroethylene liquid is reduced;

a compression spring 3-7 is fixed on the material receiving net 3-6; the upper end of the compression spring 3-7 is provided with a material holding umbrella 3-8, the material holding umbrella 3-8 is in an umbrella cover shape with a downward opening, and the diameter of the edge of the opening is larger than that of the cylindrical part of the material receiving bin 3-1 and smaller than the maximum diameter of the expanded part 3-5 of the material receiving bin 3-1; under the state that the compression spring 3-7 only bears the material bearing umbrella 3-8, the edge of the material bearing umbrella 3-8 extends into the expansion part 3-5, and the compression spring 3-7 is used for pressing the material bearing umbrella 3-8 and the material receiving bin 3-1.

The structure can ensure that volatile gas of trichloroethylene in the mixing bin 3-4 does not overflow under the condition that the weight of aggregate on the material bearing umbrella 3-8 does not enable the compression spring 3-7 to deform, when the weight of the aggregate enables the compression spring 3-7 to deform, the space between the material bearing umbrella 3-8 and the material receiving bin 3-1 is opened, the aggregate can fall along the material bearing umbrella 3-8, the weight of the aggregate on the material bearing umbrella 3-8 is reduced after the aggregate falls, the compression spring 3-7 can rebound in time, and then the space between the material bearing umbrella 3-8 and the material receiving bin 3-1 is closed. When the space between the material bearing umbrella 3-8 and the material receiving bin 3-1 is opened, aggregate is accumulated at the opening, and the accumulation of the aggregate can prevent the volatile gas from overflowing.

Specifically, the material receiving bin 3-1 is provided with a funnel-shaped mixing bin 3-4 with an upward opening below the material receiving net 3-6.

The material-holding umbrella 3-8 is thick in the center and thinner towards the edge. The material of the material bearing umbrella 3-8 can be made of fluororubber or metal, and the fluororubber has the advantage that the aggregate has a buffer on the fluororubber after falling from the aggregate separating screen 3-2, so that the damage to equipment is reduced. Moreover, the material holding umbrella 3-8 is thicker in the center and thinner towards the edge, which is more beneficial to the falling of the aggregate.

Specifically, the aggregate secondary treatment system 4 receives a mixture of fine aggregate and trichloroethylene extracted from the bottom of the mixing bin 3-4 by the fine particle circulating machine 3-7, then solid-liquid separation is carried out, the solid is discharged from the solid outlet 4-2, and the liquid is discharged from the liquid outlet 4-3. The secondary aggregate treatment system 4 can realize the automatic separation of aggregate and washing liquid, and the washing liquid belongs to toxic chemicals, so the structure reduces the harm to human bodies.

The aggregate secondary treatment system 4 preferably uses a horizontal screw separator.

The model of the fine particle circulator 3-7 is 32BYKL12-10-1.1 of Shanghai Boyu Pump industry Co.

Specifically, the waste liquid and asphalt recycling system 5 is used for receiving the liquid separated by the aggregate secondary treatment system 4, separating asphalt and trichloroethylene in the liquid, and recycling the separated asphalt; the separated trichloroethylene is conveyed to a mixing bin 3-4 for reuse.

The waste liquid and asphalt recovery system 5 comprises a recovery bin 5-3 for receiving separated liquid discharged from a liquid outlet 4-3 of the aggregate secondary treatment system 4, a condensation system 5-1 for condensing and refluxing washing liquid and a solvent bin 5-2 for containing the recovered washing liquid; the solvent bin 5-2 is connected to the receiving bin 3-1 through a pipeline and is used for conveying the recovered trichloroethylene to the mixing bin 3-4 for recycling.

A heating plate 5-4 is arranged at the bottom of the recovery bin 5-3, and in the continuous heating process, trichloroethylene steam enters a condensing system 5-1 to be condensed and then flows back to a solvent bin 5-2 for containing recovered washing liquid; and an asphalt outflow port 5-5 is arranged at the bottom of the side wall of the recovery bin 5-3.

Example 2

A method for crushing, screening and recycling waste asphalt pavement materials comprises the following steps of:

s1, placing the waste road pavement aggregate shoveled from the pavement into a crushing and separating system 1, crushing the large aggregate and primarily stripping asphalt on the surface of the aggregate under the action of a high-pressure water gun 1-1 and a crusher 1-2;

s2, driving the aggregate treated in the step S1 by a conveyor belt 2-1 of a heat treatment system 2, and heating and drying under the action of a heating plate 2-2 and a hot air blower 2-3;

s3, dropping the dried aggregate onto an aggregate separating screen 3-2 in a receiving bin 3-1 of an aggregate primary treatment system 3, rolling the aggregate with large particle size downwards along the inclined aggregate separating screen 3-2, and finally rolling out from a coarse aggregate outlet 3-3; aggregate with small particle size falls onto the material bearing umbrella 3-8 from the aggregate separation screen 3-2, and the compression spring 3-7 is pressed to deform along with the increase of the weight of the material on the material bearing umbrella 3-8, so that the material bearing umbrella 3-8 is separated from the material receiving bin 3-1, and the aggregate slides down the material bearing umbrella 3-8; along with the weight reduction of the materials on the material bearing umbrella 3-8, the compression spring 3-7 deforms, so that the material bearing umbrella 3-8 and the material receiving bin 3-1 are tightly pressed, and the aggregate stops falling; one part of the aggregate sliding down the material-holding umbrella 3-8 directly enters the mixing bin 3-4, and the other part of the aggregate is buffered by the material-holding net 3-6 and then falls into trichloroethylene in the mixing bin 3-4 for mixing and soaking;

s4, soaking the fine aggregates in the mixing bin 3-4, conveying the fine aggregates to the aggregate secondary treatment system 4 by the fine particle circulating machine 3-7 for solid-liquid separation, directly discharging the solids from the particle circulating machine 3-7, and feeding the liquid into the waste liquid and asphalt recovery system 5;

s5, separating asphalt and trichloroethylene in the liquid entering the waste liquid and asphalt recovery system 5, and recovering and recycling the separated asphalt; the separated trichloroethylene is conveyed to a mixing bin 3-4 for reuse.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.