JPH04298279A - Method and device for regeneration treatment of aggregate from waste asphalt material - Google Patents

Abstract

PURPOSE:To produce the aggregate contained in the waste asphalt materials discharged by cutting out pavements at prescribed grain sizes from these materials while lessening the intrusion of asphalt-components down to a substantially negligible level. CONSTITUTION:Raw materials 3 consisting of the particles of the waste asphalt materials crushed to the prescribed grain sizes are subjected to a frictional crushing stage 5 in water, by which these raw materials 3 are crushed and the aggregate of the prescribed grain sizes is obtd. The asphalt components sticking to the aggregate are peeled and the aggregate 8a, 8b of the required grain sizes are further separated and captured from the liquid mixture 6 subjected to the frictional crushing while water is applied thereto.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is used to mechanically extract the aggregate contained in asphalt waste generated by peeling or scraping for the purpose of repairing or improving road pavement and reusing it. The present invention relates to an applicable method and apparatus for recycling aggregate from asphalt waste.

0002

2. Description of the Related Art Conventionally, heat treatment methods and mechanical treatment methods are known as means for extracting aggregate contained in asphalt waste. The heat treatment method heats the asphalt waste material to soften the asphalt component, which also acts as a binder to the aggregate, and loosens and collects the aggregate. The waste material is crushed by a crusher multiple times,
Each piece of crushed material is sieved and collected as aggregate of a predetermined particle size.

0003

[Problems to be Solved by the Invention] Conventional recycled aggregates, especially those obtained by mechanical processing, currently contain a large amount of asphalt because they have been subjected to crushing treatment. Compared to new asphalt, this old asphalt is generally harder, has a higher softening temperature, and has a lower elongation rate. Traditionally, additives, also known as softeners, were mixed with recycled aggregates to improve the properties. In order to remove asphalt from recycled aggregate, a method called the Abson method is used, in which the asphalt is dissolved in a solvent, the minerals such as feeler are extracted using a centrifuge, and then distilled while preventing oxidation. Various processes such as eliminating asphalt are required, and it has been desired to supply recycled aggregate with a low asphalt content.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a high-quality recycled aggregate containing little to no asphalt.

[0005]

[Means for Solving the Problems] The solution method according to the present invention is to crush the aggregate by grinding the raw material of granulated asphalt waste in water, and at the same time crush the asphalt attached to the aggregate. This method is characterized by separating and collecting the required aggregates from the mixed liquid discharged from the water by scraping the aggregates. It is also desirable to separate the aggregate in the mixed liquid multiple times and classify the aggregate according to its size. It is desirable to separate water from a sludge solution containing wood and asphalt, collect dehydrated sludge, purify the polluted water, and supply it as water necessary for the grinding.

[0006]

[Example] To explain the present invention in detail, as shown in the flowchart in Fig. 1, a pre-process 2 in which asphalt lumps 1 brought in as waste material from a site is crushed to a particle size of approximately 5 to 20 mm. The particles having a predetermined particle size obtained therefrom are used as raw material 3. The raw material 3 together with water 4 is continuously supplied in a constant amount to a grinding step 5 according to the processing capacity of the step 5. In this grinding step 5, the raw material 3 is further crushed, and the asphalt adhering to each particle of the raw material is peeled off and released into the water. Therefore, the first mixed liquid 6 discharged from the grinding step 5 contains aggregates and asphalt with different particle sizes, and the first mixed liquid 6 is further mixed with water 4.
It is also injected into the first separation step 7. Here, the process is carried out through one to several stages of sieving, and each aggregate 8a, 8b having a plurality of predetermined particle sizes is classified and collected, and the particle size depends on the asphalt pavement standard. ,
The length of aggregate 8a is 13 to 20 mm, and the length of aggregate 8b is 5 to 13 mm.
are deposited individually with a grain size of m. Also, the first separation step 7
By injecting water during this process, water is injected to prevent clogging of the sieve and to wash away asphalt adhering to the sieved aggregate.

[0007] Although the desired recycled aggregate can be produced through the above steps, the second
Since the mixed liquid 9 still contains aggregates with a particle size that can be reused sufficiently, a second separation step 10 is further performed to collect aggregates 8c that actually have a particle size of 5 mm or less. do. In this second separation step 10, the samples are collected by a method of separation in water. Then, the sludge liquid 11 from which the aggregate 8c has been removed from the second separation process 10 is injected into the purification process 12,
In step 12, dehydrated sludge 13 obtained by a settling method or the like is collected, and clear water 4 is supplied to the grinding step 5 and the first separation step 7 for reuse. However, the dehydrated sludge 13 contains asphalt and powdered aggregate, and can also be used as a fill material for land development.

Next, the processing apparatus will be explained with reference to FIG. 2. Raw material 3 is charged into a hopper 14, and in a pre-process to obtain the raw material 3, it is molded to a predetermined particle size using, for example, a roll crusher or a hammer mill. So hopper 1
Since the discharge amount from the hopper 14 is unstable, a feeder 15 is provided below the hopper 14, and a belt conveyor 16 is provided on the discharge side of the feeder 15 so that the supply amount can be continuously controlled to be constant. A supply facility 17 consisting of a feeder 15 and a belt conveyor 16 is installed. Next to the supply equipment 17, a grinding equipment 18 such as a screw type crusher is provided, and a first water supply equipment 19 including a pump for injecting water into the raw material input portion is attached. Therefore, the grinding equipment 18 is filled with water, and the raw material 3 is crushed in the water, and the asphalt component is liberated at the same time.

The first liquid mixture 6 discharged from the grinding equipment 18 is supplied by falling into the first separation equipment 20, and at this time also water is injected by the second water supply equipment 21, but this first separation The equipment 20 may be equipped with a sorting section using, for example, a plurality of filters 22 and 23 stretched vertically and slanted, and may be a machine that applies vibration to promote separation, guides the filter to a lower section, and discharges the filter as it is. , each filter 22, 23
The aggregates 8a and 8b extracted from the lower part of the aggregate are collected by first and second belt conveyors 24 and 25 provided individually, and are individually deposited at predetermined locations.

A second separation facility 26 receives the second mixed liquid 17 classified as described above and discharged after passing through the filters 22 and 23, and collects the aggregate 8c to be further mixed.
will be established. As this second separation equipment 26, a spiral separator that climbs upward is used, and a plurality of them are installed in parallel according to their processing capacity. Fine-grained aggregate 8c is discharged from the upper discharge port 27, and sludge liquid 11 flows away from the lower port 28. Therefore, the above aggregate 8c
is collected on the third belt conveyor 29 and deposited at a predetermined location. On the other hand, the sludge liquid 11 flows into the purification treatment equipment 30 and is divided into clarified water 4 and dehydrated sludge 13, and the water 4 is configured to flow back to the first and second water supply equipment 19, 21 by a pump. .

[0011]

[Effects of the Invention] With the method and apparatus for recycling aggregate from asphalt waste according to the present invention, a) particles of asphalt waste are ground in water, so that particles adhere to the outer surface of the particles. As the asphalt content is scraped off and released into the water, and the aggregate is separated and collected while being washed with water, the asphalt content in the collected aggregate is almost negligible. It can be obtained in almost no condition and can be provided as a high quality aggregate. (b) Furthermore, since the milled mixed liquid is classified and collected into aggregates of different particle sizes, recycled aggregates can be provided depending on the intended use. c) In addition, the water used during the treatment process can be clarified and reused, and the dehydrated sludge discharged during the purification process can also be reused as materials, so non-recyclable waste materials are discharged during this series of treatments. This results in extremely beneficial industrial effects.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing the steps of a method for recycling aggregate from asphalt waste according to the present invention.

FIG. 2 is an explanatory diagram showing an apparatus for recycling aggregate from asphalt waste according to the present invention.

[Explanation of symbols]

Claims (7)

[Claims] [Claim 1] Raw material for granulated asphalt waste (
Raw material (3) is milled in water (4).
) is crushed, the asphalt adhering to the raw material is scraped off and released into water, and the required aggregate (
A method for recycling aggregate from asphalt waste, characterized by separating and collecting 8a and 8b). [Claim 2] Raw material for granulated asphalt waste (
Adding water (4) to 3) and performing the grinding step (5),
After separating the asphalt adhering to the granular raw material (3), a first step is performed to collect aggregates (8a, 8b) of a predetermined particle size from the first mixed liquid (6) discharged from the grinding step (5). The first separation step (7) is further performed while adding water (4), and the particles are finer than the aggregates (8a, 8b) contained in the second mixed liquid (9) discharged from this first separation step (7). A method for recycling aggregate from asphalt waste, characterized by performing a second separation step (10) of collecting aggregate (8c). 3. Claim 1, characterized in that in the first separation step (7), the aggregates of various particle sizes contained in the first mixed liquid (6) are classified into a plurality of predetermined particle sizes.
2. The method for recycling aggregate from asphalt waste as described in 2. 4. The fine aggregate and asphalt contained in the sludge liquid (11) discharged from the second separation step (10) are purified by a purification step (12) to obtain dehydrated sludge containing the fine aggregate and asphalt. The asphalt waste material according to claim 2 or 3, wherein the separated water (4) is collected as (13) and recycled to the grinding step (5) and the first separation step (7). Aggregate recycling processing method. 5. Supply equipment (14) comprising a hopper into which the raw material of granulated asphalt waste is input, a feeder that controls the quantitative outflow of the raw material discharged from the hopper, and a conveyor that conveys the raw material from the feeder; A grinding equipment (18) on the discharge side of the conveyor, a first water supply equipment (19) injected into the grinding equipment (18), and a first mixed liquid (6) discharged from the grinding equipment, which is included therein. a first separation facility (20) that separates and discharges aggregates of a predetermined particle size; a second water supply facility (21) that injects water into the first separation facility;
Furthermore, the second mixed liquid (9) flowing out from the first separation equipment (20)
), the asphalt waste material is equipped with a second separation facility (26) that separates the collected aggregate into a sludge solution (11) containing aggregate and asphalt, and discharges each separately. aggregate recycling processing equipment. 6. A claim characterized in that the first separation equipment (20) is equipped with a plurality of sorting sections that separate aggregates of a plurality of predetermined particle sizes with different particle sizes and discharge them individually. 5. The apparatus for recycling aggregate from asphalt waste material according to 5. 7. A sludge liquid (11) containing aggregate and asphalt discharged from the second separation equipment (26)
7. The apparatus for recycling aggregate from asphalt waste material according to claim 5 or 6, further comprising a purification treatment facility (30) for separating the dehydrated sludge (13) and water (4) from the asphalt waste.