CN109550573B

CN109550573B - Static lossless granulating method for waste asphalt mixture

Info

Publication number: CN109550573B
Application number: CN201910035405.1A
Authority: CN
Inventors: 赵之仲; 柳泓哲; 黎奎; 王娜; 李颖
Original assignee: Shandong Jiaotong University
Current assignee: Shandong Jiaotong University
Priority date: 2019-01-15
Filing date: 2019-01-15
Publication date: 2023-04-25
Anticipated expiration: 2039-01-15
Also published as: CN109550573A

Abstract

The invention discloses a static non-destructive granulation method for waste asphalt mixture, which is used for recycling waste asphalt. The method process includes: step 1, slurry proportioning, adding water to form a mixed slurry after high alumina slag and titanium gypsum in a ratio of 3:2, the mixed slurry is immersed in the material in the container, and step 2, mixing the mixed slurry After the material absorbs water, cover the water-absorbing pad completely on the surface of the mixed slurry in the container, connect the vacuum water-absorbing machine and start the vacuum water-absorbing machine, the excess water in the container is absorbed by the water-absorbing pad and discharged by the vacuum water-absorbing machine; Step 3, static maintenance; Fourth, vibrating cracking and vibrating screening of the cured materials. In this method, the raw materials are the production of titanium dioxide waste and another waste-high-alumina slag, which can turn waste into treasure and reuse resources, and the generated ettringite expansion body has no pollution to the environment, and the whole process is environmentally friendly. , is conducive to the development of the industry.

Description

Static lossless granulating method for waste asphalt mixture

Technical Field

The invention belongs to the field of recycling of highway engineering construction waste, relates to a novel process method for crushing waste asphalt mixture (RAP: recycle asphalt pavement for short), and belongs to the technology of reutilization of waste asphalt resources.

Background

Through large-scale highway investment construction, the road network scale of China is the first place in the world, with the increasing development and updating of highway construction, the traffic volume is increased continuously, especially the massive emergence of heavy and extra heavy load trucks, so that the highway of China needs to be continuously rebuilt or even rebuilt, and according to preliminary statistics, only major and middle maintenance projects of the highway of the China generate more than 1.6 hundred million tons of RAP materials each year. At present, the recycling rate of highway pavement materials in China is about 30 percent, which is far lower than the utilization rate level of more than 90 percent in developed countries. Therefore, accelerating the recycling of waste materials on highway pavement has extremely important effects of saving resources, reducing emission and protecting environment.

Due to technical limitations, in highway engineering, the milled RAP material (waste asphalt mixture) is directly abandoned, so that huge resource waste is caused, and environmental pollution is caused. With the importance of environmental protection and sustainable development, asphalt pavement thermal regeneration technology, including plant-mixed thermal regeneration technology and in-place thermal regeneration technology, has been developed rapidly, and has been widely applied in highway maintenance in China in recent years, which is the recycling technical field related to the invention.

The early hot mix plant regeneration has a stricter limit on the doping amount of RAP, and is generally required to be not more than 20% when the RAP is especially applied to pavement surface layers. With the development of technology and the demands of society, attempts and researches are being made to incorporate more RAP materials into the regenerated mixture, and the amount of RAP materials is increased to more than 30%, even up to 50%. In the in-situ thermal regeneration, the mixing amount of the RAP material is more than 80 percent. Therefore, the high RAP material mixing amount becomes the current development trend of asphalt pavement recycling in China.

The main problems of the existing waste asphalt recycling link are as follows:

in the use process of the asphalt pavement, asphalt can age under the dual actions of running load and climate factors, so that cohesiveness is rapidly reduced, aggregates are crushed, and grading is seriously damaged, so that the asphalt pavement using the regenerated asphalt material can generate pavement diseases such as cracks, water damage, rutting and the like in the long-term operation process, and the performance of the asphalt pavement is reduced.

The solution to the recycling problem of the reclaimed asphalt is mostly solved from the use links, for example, asphalt pavement paved by the reclaimed asphalt must be periodically maintained and reformed in the use process. When the pavement diseases are lighter, the treatment modes such as a cover surface, a micro-surfacing and the like can be used; when the pavement damage is heavy, it is common practice to mill the old asphalt pavement and then re-lay the asphalt mixture thereon.

The invention starts from the front end of the process for recycling waste asphalt, namely, the problems existing in recycling are solved from the crushing and physicochemical of RAP materials, and the method is completely different from the existing physical cracking method by adopting a crusher. For example, in the prior art, currently, jaw crushers, impact crushers and other machines are commonly used for crushing, and the two crushing modes have low cost but poor crushing effect. The jaw crusher is widely applied to crushing of mountain-working quarrying, and when the jaw crusher is applied to crushing of RAP materials, gravels are clamped to destroy the original grading of the RAP materials; the impact crusher has the advantages that as the rotating speed of the main shaft is high, the impact blocks and the buffer plates are worn relatively quickly when the impact crusher is applied to crushing of RAP materials, and stones are crushed at the same time, so that the original grading of the RAP materials is damaged. The working principle of the crusher is crushing by extrusion or knocking, however, the RAP materials are aggregates with various specifications are bonded together by viscous asphalt, and the extrusion or knocking has no obvious effect on the viscosity of the asphalt, so the crushing degree is lower, and the grading requirement cannot be met.

The problems, nature and effects of the present invention will be described in detail below.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a crushing method based on internal stress and expansion force, which is a method and a device system for effectively and efficiently crushing the existing large RAP material, especially the large RAP material with the grain diameter exceeding 20cm, by generating the internal stress through soaking and chemical reaction.

The aim of the invention is realized by the following technical scheme:

the static lossless granulating method for the waste asphalt mixture is characterized by comprising the following steps of:

step one, proportioning slurry, namely adding water into blast-furnace slag and titanium gypsum according to the proportion of 3:2 to form mixed slurry, then pouring the mixed slurry into a container, immersing the materials in the container by the mixed slurry,

step two, absorbing water to the mixed slurry, fully covering the water absorbing pad on the surface of the mixed slurry in the container, starting the vacuum water absorber after connecting the vacuum water absorber, tightly pressing the water absorbing pad on the surface of the slurry by the suction force of the vacuum water absorber, absorbing excessive water in the container by the water absorbing pad and discharging the water out of the vacuum water absorber until the water absorbing pad is concentrated to a preset degree;

step three, standing and maintaining, and standing for at least 7 days at room temperature;

and fourthly, performing vibration breaking and vibration screening on the cured material.

In the fourth step, the cracked materials are subjected to vibration cracking by using a vibration cracking machine or a rotary crusher, and are screened by using a vibration screening machine.

The vibration cracking machine comprises a vertically arranged channel formed by enclosing a shell, wherein the upper end of the channel is a feed inlet, the lower end of the channel is a discharge outlet, two baffles are arranged in the channel between the feed inlet and the discharge outlet, the baffles are arranged in a staggered manner, and an eccentric motor is fixed outside the shell.

The rotary crusher is characterized in that a rotary disk body is arranged in the center of the inner part of a tank body of the rotary crusher, a feed inlet is formed in the top of the tank body, a discharge outlet is formed in the bottom of the tank body, a cast iron wear-resisting plate is inlaid on the inner wall of the tank body, and the rotary disk body is driven by a speed-regulating variable-frequency motor positioned below.

The vibration screening machine is 3YZ-1236 model of pioneer mechanical company of new county.

The diameter of the rotary disk body is 1.5-2 times of the diameter of the feed inlet, and the rotating speed is more than 120r/min.

The vibration screening machine is classified into the following components according to the applied size fraction: four-level classification > 20mm, 10-20mm, 5-10mm and 0-5 mm.

The material is RAP material.

The RAP is a massive material with the particle diameter exceeding 20 cm.

The beneficial effects of the invention are as follows:

the principle of the invention is to treat the large-block RAP material by a chemical method, remove redundant moisture in a material bin by a vacuumizing mode, enable slurry required by treatment to enter the pores of the large-block RAP material and be filled, enable all the RAP material to form ettringite expansion bodies within 7 days after the chemical reaction starts, expand the RAP material, achieve the purpose of crushing, and prevent aggregate wrapped by asphalt from being damaged, and meanwhile, disperse asphalt from being bonded into clusters, thereby avoiding adverse use of regenerated asphalt in the later period.

Meanwhile, the method has the advantages that the raw materials are used for producing titanium dioxide waste and another waste, namely the blast-furnace slag, waste materials can be changed into valuable materials, resources are recycled, the produced ettringite expansion body has no pollution to the environment, and the whole process is environment-friendly and is beneficial to the development of industry.

The invention is especially suitable for crushing large RAP materials with the particle size exceeding 20cm, and the generated crushing effect is uniform and consistent.

The whole process has small heat generation amount, and basically no aging high temperature state is generated on asphalt, so that the performance of the crushed asphalt is kept better.

Drawings

Fig. 1 is a schematic installation diagram of a material bin and a vacuum water absorber.

Figure 2 is a schematic diagram of a vibratory breaker and vibratory screening machine.

FIG. 3 is a SEM sectional view structure diagram of the test piece after 1 day of curing.

FIG. 4 is a SEM sectional view of the test piece after 3 days of curing.

FIG. 5 is a SEM sectional view of the test piece after 7 days of life.

FIG. 6 is a SEM sectional view of the test piece after 14 days of life.

FIG. 7 is a SEM sectional view of the test piece after 21 days of life.

Fig. 8 is an elemental analysis diagram of a scanning electron microscope.

Fig. 9 is a schematic diagram of a broken portion in the second embodiment.

In the figure:

1 a vacuum water sucking machine,

2 a water absorbing pad of concrete,

3 a material bin is arranged on the upper part of the container,

4 vibration cracking machine, 41 baffle plate, 42 eccentric motor,

5 a vibration sieving machine,

a 6-stage material collector, wherein the material collector,

7 rotary crusher, 71 pan feeding mouth, 72 discharge gate, 73 cast iron antifriction plates, 74 rotary disk body, 75 motor, 76 protecting crust.

Detailed Description

The invention is thatThe principle of the method is that industrial residue ━ titanium gypsum is combined with blast-furnace slag, and industrial residue ━ titanium gypsum is effectively mixed with the blast-furnace slag into asphalt RAP material to generate ettringite and form an expansion body. Ettringite (AFt phase, 3CaO.Al) ₂ O ₃ ·3CaSO ₄ ·32H ₂ O) is a hydration product of titanium gypsum combined with blast-furnace slag, belongs to calcium aluminum sulfate minerals, is a colorless to yellow mineral crystal, and accounts for about 7% of cement hydration product. AFt is capable of swelling because it binds and adsorbs 32 water molecules during formation, which increases the solid phase volume of AFt by about 125%.

Wherein,,

titanium gypsum is dissolved to produce

And Ca ²⁺ Production of OH by high-aluminium slag minerals ^- And->

These ions are brought together by concentration differential diffusion, forming the AFt in three steps:

the first step:

and a second step of: [ Al (OH) ₆ ] ^3- +3Ca ²⁺ +12H ₂ O→{Ca ₃ Al(OH) ₆ ·12H ₂ O} ³⁺

And a third step of:

ettringite is not stable, and mainly has two basic types of AFt and AFm, wherein AFt is generated at the initial stage of reaction, and is converted into AFm along with the gradual rise of temperature, and when the temperature gradually decreases and returns to normal, AFm is converted into AFt, the interconversion between AFt and AFm is a process of expanding first and then contracting and then expanding, and the second expansion process occurs after the strength is completely formed.

Blast-furnace slag: industrial titanium gypsum = 3:2, ettringite is more produced, has more obvious form, and is easy to carry out microscopic analysis by a scanning electron microscope (SEM for short), so that a clean slurry test piece (a test piece refers to a large RAP material sample with the grain size exceeding 20 cm) with corresponding proportion is molded according to the standard requirement, standard health maintenance is carried out on the test pieces with the grain size of about 30cm in the embodiment, and test pieces with the age of 1 day, 3 days, 7 days, 14 days and 21 days are respectively detected.

And (3) placing the cured test piece into absolute ethyl alcohol for dehydration, and then detecting by using a scanning electron microscope, wherein an SEM section structure diagram and energy spectrograms of the test piece are shown in figures 3 to 7 and 8, and figures 3 to 7 are SEM section structure diagrams of the test piece at different ages.

As can be seen from the elemental analysis of the scanning electron microscope of FIG. 8, the ettringite sweller (AFt) corresponds to the needle-like crystal structure in the figure.

As shown in FIG. 3, the SEM sectional structure after 1 day of specimen curing is shown, the needle-like crystal structure and the flocculent structure are clearly visible, and the formation amount of ettringite expansion body is small.

As shown in FIG. 4, which is a SEM sectional structure diagram of the specimen after 3 days of curing, the needle-like crystal formation region rapidly expands, and the crystal gradually changes from a needle-like shape into a thick and long columnar shape.

As shown in FIG. 5, the SEM sectional structure after the specimen was subjected to the curing for 7 days, the needle-like crystal formation region was further enlarged and was radially formed.

As shown in FIG. 6, which is an SEM sectional structure diagram of the specimen after being subjected to the curing for 14 days, the needle-like crystals continue to gradually change into columnar shape.

As shown in fig. 7, which is a SEM cross-sectional structure diagram of the specimen after 21 days of life, the columnar crystal formation region tended to be stable, and the needle-like crystals continued to become thicker and tended to be stable.

From the analysis, the generation amount and the generation range of the ettringite expansion body are increased along with the increase of the life of the test piece, the microscopic morphology is gradually thickened and lengthened, the needle-shaped crystal is gradually changed into the columnar crystal, the maximum is reached at the 3 rd day of the life, the stability is achieved at the 21 st day of the life, and the whole test piece is in an expanded state.

Table 3.10 cement: industrial titanium gypsum: blast furnace slag = 1:0.4:0.6 length change

As can be seen from Table 3.10, the whole body has a tendency of expansion and contraction after expansion, because the mixing amount of industrial titanium gypsum and high-alumina slag is more, the reaction time is longer, the generated expansion body is more, the expansion trend is always present in the previous 7 days, weak contraction starts to appear after 7 days, the test piece is basically stable until 28 days, the whole body of the test piece still has an expanded state, which indicates that the generation amount of ettringite expansion body is larger than the contraction amount caused by hydration and dehydration of cement, the final deformation amount of the test piece is about 0.207mm, and the final strain is about 1300 multiplied by 10 ^-6 。

The chemical reaction and the reaction environment are realized through the following devices and steps:

the preparation work is to prepare a concrete vacuum water absorber 1, a concrete water absorbing pad 2, a material bin 3 and a pipeline capable of bearing a certain pressure. The vacuum water sucking machine and the water sucking pad are connected through a pipeline.

For example, one model of Shandong middle-sized transport company is HZX-70 concrete vacuum absorber and related concrete water absorption pad, and the concrete vacuum absorber and the concrete water absorption pad are connected through a rubber tube.

As one conceivable expectation, the connection end of the rubber tube is sealed with a sealant, or a heat-shrinkable tube is sleeved at the connection part of the rubber tube and the suction nozzle of the water absorption pad, and the heat-shrinkable tube shrinks after heating to achieve the sealing effect.

Example 1

Referring to fig. 1, in this embodiment, a cylindrical material bin 3 is preferably used, because the circular water absorbing pad can be combined with a cylindrical gap to fit the cylindrical gap, and the space is larger, more RAP material to be crushed can be placed, and if the cylindrical material bin is square or rectangular, the joint of the gap is the same as that of a circular material bin, but the cylindrical material bin has four right-angle corners, and if the cylindrical material bin is improperly processed, the sealing effect is greatly reduced; if the bin is elliptical, the sealing effect is considerable, but the storage space is limited, so that the circular bin is the best choice.

Pouring a proper amount of RAP materials into the material bin 3 in advance, wherein the quantity of the RAP materials occupies not more than two thirds of the volume in the material bin, so that enough grouting space is reserved, and the physical size range of the common RAP materials is as follows:

firstly, proportioning the slurry, namely proportioning the blast-aluminum slag and the titanium gypsum=3:2 according to the best experimental result obtained in a laboratory, then adding water for dilution to form a mixed solution, namely mixed slurry, slurry and slurry, so that the mixed slurry and the mixed slurry react after proportioning, the reaction speed is slow and negligible, the mixed slurry is immediately poured into a material bin, the injection height of the slurry is higher than 1-2cm of the material, that is, the slurry is completely immersed in the material, full coverage is realized, and all the materials are ensured to be below the liquid level, so that all the materials can fully absorb the slurry.

For example, in the specific implementation process of the embodiment, the materials are ensured to be closely arranged in the material bin, a tamping process can be properly adopted, internal void is avoided, a basically flat surface is formed as much as possible, and the single treatment capacity is effectively improved. For example, in the embodiment of the material bin, a barrel body with the radius of 3m and the height of 1.5m is selected, so that the maximum cost performance can be obtained.

The second advantage of the material filling the space in the bin as much as possible is that the water absorbing pad is convenient to cover completely, and the vacuum water absorption is facilitated. This is because, when the concrete water absorbing pad is placed on the surface of the slurry, the nylon filter cloth of the lower surface of the concrete water absorbing pad is brought into contact with the slurry. As a general knowledge, a concrete absorbent pad is known as an existing product, and its structural composition is: the concrete water absorption pad comprises a nylon filter cloth and a cover pad, wherein the upper end of the nylon filter cloth and the cover pad are airtight, the lower side of the nylon filter cloth is provided with a sac body, the cover pad is provided with a vacuumizing connector, the vacuumizing connector is connected with a vacuum water absorption machine through a pipeline, and in order to ensure excellent water absorption effect, the periphery of the water absorption pad is glued with a circle of sealing edge to ensure the sealing performance of the water absorption pad, so that the nylon filter cloth is ensured to be fully and effectively oriented to the slurry below.

And secondly, extracting redundant water in the slurry, starting a vacuum water absorber, tightly pressing the water absorbing pad on the surface of the slurry by the suction force of the vacuum water absorber, absorbing the redundant water in the bin by the water absorbing pad, enabling the slurry to move upwards along with the water, entering the material pores, and fully filling, wherein the slurry in the bin is concentrated in the process, and the redundant water enters the vacuum water absorber through nylon filter cloth and a pipeline on the water absorbing pad and is stored or discharged by the vacuum water absorber.

And thirdly, standing and maintaining, namely stopping and removing the vacuum water absorber after the slurry is concentrated to a preset degree, and standing for 7 days at room temperature to fully react the titanium gypsum and the high-aluminum slag, wherein an ettringite expansion body is generated as a result of the reaction. The small middle beam expansion test in the laboratory shows that the self-stress ettringite expansion body with the expansion volume of more than 2MPa can be formed, and the fineness of the slurry is thin, so that the slurry can be fully filled when materials enter, the slurry and the slurry react fully, the larger expansion body can be obtained, the RAP materials can be easily recovered by expanding asphalt, and the RAP materials can be expanded.

Step four, screening, namely placing the RAP material after 7 days of curing into a vibration cracking machine 4 and a vibration screening machine 5, wherein the vibration cracking machine and the vibration screening machine crack and screen the material in a vibration separation mode, and the specific process is as follows:

firstly, the materials are further uniformly dispersed through vibration by a vibration cracking device, and generally, the RAP materials in the step three generate cracks and the cracking effect can be generated through vibration. And classifying the cracked materials by using a vibration screening machine.

For example, an apparatus that can be realized is the vibration cracker 4, which includes a vertically arranged channel surrounded by a housing, the upper end is a feed inlet, the lower end is a discharge outlet, two baffles 41 are disposed in the channel between the feed inlet and the discharge outlet, and the baffles are disposed in a staggered manner, so that the advancing path of the material is prolonged, and the material is primarily blocked and cracked. And an eccentric motor 42 is fixed outside the housing, and the eccentric motor is turned on to make the device vibrate as a whole. As a means that can be designed, the device is usually mounted on the foundation by means of a set of springs, that is to say a resilient connection between the device and the foundation, in order to obtain an optimal vibration effect. The installation angle of the baffle plates is optimal, wherein the two baffle plates form an included angle of 45 degrees with the shell. The material falls down by gravity in the device, and in the falling process, the splitting and cracking are realized under the action of the baffle and the eccentric motor.

Vibration screening machine 5 is located the side below of vibration cracking device, that is to say that the material enters into vibration screening machine from vibration cracking device blanking back, and this vibration screening machine is graded through the interval between roller bearing and the roller bearing, and specifically, the classification according to the size fraction of using is divided into: the four-level classification is realized by more than 20mm, 10-20mm, 5-10mm and 0-5 mm. And the last stage of 0-5mm is recovered by a conveyor belt, and each stage of material is correspondingly provided with a collector, and the sieved material is collected for later use.

For example, as a possible scheme, the core part of the vibration screening machine 5, that is, a plurality of rollers 51 arranged in parallel, two ends of each roller are arranged on a frame through bearing seats with adjustable gaps, one end of each roller is driven by a motor through belt transmission, that is, the rotation of the motor is used for driving the rotation of the whole roller, the rotation speed of the motor is adjusted, the rotation speed is controlled at 60r/min as much as possible, the rotation is uniform and slow, the materials are fully dispersed, and the materials of each particle size are ensured to reach the target requirement. In this embodiment, the rollers are designed into three groups and are obliquely arranged, so that four-stage grouping is realized, and the axial intervals of the three groups of roller assemblies are gradually reduced from top to bottom, so that the purpose of gradual grading can be realized. And a corresponding material collector 6 is arranged at the lower end of each group of rollers, namely the discharge port, so that the classified materials are effectively classified and stored.

It should be further noted that in the present invention, the main components in the slurry are titanium gypsum (titanium gypsum, pure gypsum or expansion cement) and high-aluminum slag, the fineness of which is not less than 450m ² The titanium gypsum is produced as titanium pigment waste material, and mainly becomes dihydrate gypsum CaSO ₄ ·2H ₂ O, the blast-furnace slag is also a waste reclaimed material, and is processed into an applicable furnaceSlag material mainly comprising Al ₂ O ₃ And aluminum-containing compounds, also containing a small portion of SiO ₂ But the main effects of both are gypsum and aluminum compounds, which react to form ettringite swells.

According to the ratio of the required contents of figures one and two, the reaction ratio is about aluminium compound to titanium gypsum=3:2, and in appropriate cases, there may be a slight error in the ratio of the two, which is allowed, and the ettringite expansion body produced after the reaction of the two can generate self-stress of more than 2MPa, can expand and break, and can expand and crack RAP materials.

In the process, the prepared slurry is soaked in massive asphalt RAP materials, gaps in the RAP materials are filled with the slurry after passing through a vacuum water absorbing device, redundant water is sucked out, and after the slurry in the gaps forms ettringite expansion bodies, the expansion self-stress expansion massive asphalt RAP materials are generated, and the complete formation of ettringite needs to last for about 7 days. The common asphalt is solid at room temperature, the asphalt blocks are taken out after the slag and the titanium gypsum are fully reflected, and are placed in a vibration bin, and the asphalt blocks are cracked at the moment and are fully dispersed. Finally, grading, recycling and storing.

Example two

The present embodiment aims at improving the crushing scheme, and provides a reliable crushing scheme, that is, the rotary crusher 7 is used for replacing the vibration cracking machine in the fourth step, referring to fig. 9, the rotary crusher 7 is integrally a cylindrical tank body, a rotary disk body is arranged in the tank body, the top of the tank body is a feeding port 71, the feeding port is funnel-shaped, the bottom of the tank body is a discharging port 72, the discharging port is designed to be funnel-shaped, and the rotary disk body is right against the vibration screening machine below. The inner wall of the tank body is embedded with a cast iron wear-resistant plate 73, when the rotary disk body 74 positioned in the center rotates at a high speed, asphalt materials are thrown out at a high speed and strike the cast iron wear-resistant plate 73 on the outer side, wherein the rotary disk body 74 is driven by a speed-regulating variable frequency motor 75 positioned below, that is to say, the speed of the rotary disk body is adjustable and controllable, and the mechanical installation structure of the motor and the rotary disk body in the tank body belongs to common design knowledge, and the detailed description is not given here. The upper surface of the rotating disc body is provided with a rough large-size bulge or rough surface, so that a large centrifugal force can be formed on the asphalt blocks, the asphalt blocks are thrown out, and under proper conditions, the complete cracking of the asphalt materials is realized by matching with motor speed regulation.

In this embodiment, the motor shaft, and the rotating disc shaft, the bearing seat and the support thereof, which are connected with the motor shaft, are all or partially wrapped in a protective shell 76, so as to protect the above-mentioned facilities and avoid damage to the motor and the transmission part thereof caused by the asphalt block.

In this embodiment, vibratory screening machine 5 may be a model 3YZ-1236 vibratory screening machine from pioneer machinery, new county. The treated RAP material enters a rotary crusher through a feed inlet and falls into a rotary disk body, the diameter of the rotary disk body is 1.5-2 times larger than that of the feed inlet, the rotary disk body is connected with a rotary machine through a connecting shaft, the rotary machine is started to drive the disk body to rotate rapidly, the rotating speed is preferably larger than 120r/min, and the centrifugal force is increased. RAP material can be thrown out immediately under the effect of centrifugal force, strikes the breaker plate, and the antifriction plate should set up to cast iron material or dull polish material, increases frictional force, makes the material breakage abundant. For the material gets into the screening machine of being convenient for, cast iron antifriction plate's lower extreme is the slope setting, and the thickening of the latter half of protecting crust designs, forms local deflector, and funnel-shaped deflector both can protect the rotating machine also can play the material water conservancy diversion effect.

The above examples are provided for illustrating the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and those skilled in the art should not depart from the spirit of the present invention in all kinds of modifications and improvements that fall within the scope of the present invention as defined in the appended claims.

Claims

1. A static non-destructive granulation method for waste asphalt mixtures, characterized by the following steps performed in sequence:

Step 1, slurry preparation: Mix high-alumina slag and titanium gypsum in a 3:2 ratio, add water to form a mixed slurry, and then pour the mixed slurry into a container to submerge the material in the container. The material is RAP material.

Step 2: Absorb water from the mixed slurry. Completely cover the surface of the mixed slurry in the container with the absorbent pad. After connecting the absorbent pad to the vacuum dewatering machine, turn on the vacuum dewatering machine. The suction force of the vacuum dewatering machine will press the absorbent pad tightly against the surface of the slurry. Excess water in the container will be absorbed by the absorbent pad and discharged by the vacuum dewatering machine until it is concentrated to the predetermined degree.

Step 3: Let it stand for at least 7 days at room temperature;

Step four: Vibration cracking and vibration screening of the cured material. Vibration cracking is performed on the cracked material using a vibratory cracker or rotary crusher, and vibration screening is performed using a vibratory screener.

2. The static non-destructive granulation method for waste asphalt mixture according to claim 1, characterized in that the vibratory cracking machine includes a vertically arranged channel enclosed by a shell, with an inlet at the upper end and an outlet at the lower end, and two baffles are arranged in the channel between the inlet and the outlet, the baffles being staggered, and an eccentric motor is fixed outside the shell.

3. The static non-destructive granulation method for waste asphalt mixture according to claim 1, characterized in that the rotary crusher has a rotating disc in the center of the tank, the top of the tank is the inlet and the bottom is the outlet, the inner wall of the tank is inlaid with cast iron wear-resistant plates, and the rotating disc is driven by a variable frequency motor located below.

4. The static non-destructive granulation method for waste asphalt mixture according to claim 1, wherein the vibrating screen is a vibrating screen of model 3YZ-1236 from Xinxiang Xianfeng Machinery Company.

5. The static non-destructive granulation method for waste asphalt mixture according to claim 3, characterized in that the diameter of the rotating disc is 1.5 to 2 times the diameter of the feed inlet, and the rotation speed is greater than 120 r/min.

6. The static non-destructive granulation method for waste asphalt mixture according to claim 1, characterized in that the vibrating screen is classified into four grades according to particle size: >20mm, 10-20mm, 5-10mm and 0-5mm.

7. The static non-destructive granulation method for waste asphalt mixture according to claim 1, wherein the RAP is a large piece of material with a particle size exceeding 20 cm.