JP3174493B2 - Method for recovering recycled single-grain crushed stone and method for producing recycled asphalt mixture using this recycled single-grain crushed stone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recovering recycled single-grain crushed stone and a method for producing a recycled asphalt mixture using the recycled single-grain crushed stone.
Or from concrete waste material, Japanese Industrial Standards (JIS-A
The present invention provides a method for recovering recycled single-grain crushed stone capable of obtaining a high-quality recycled single-grain crushed stone conforming to the above-described method, and a method for producing a recycled asphalt mixture having a high waste material recycling rate using the recycled single-grain crushed stone. It is in.

[0002]

2. Description of the Related Art Conventionally, asphalt waste generated in repairing a pavement road or the like is crushed by a mechanical crushing method or a thermal crushing method, etc., and is reused as a raw material of a 0-13 mm asphalt mixture recycled mixture material. Was. Specifically, in the mechanical crushing method, the crushed material is roughly divided into primary crushes using a jaw crusher, and further divided into predetermined sizes by a secondary crush using an impact crusher, and the crushed material is regenerated into a subbase course. As a material (0 to 40 mm) or as a 0 to 13 mm asphalt mixture recycled composite material, it was recovered.
On the other hand, concrete waste generated by the demolition of buildings, etc., has various dimensions and shapes, and also contains foreign matters such as reinforcing bars, earth and sand, and trees. After removing sediment and other foreign matter, the material was further divided into small pieces by a crusher to remove reinforcing bars and the like, and then separated by a sieve, and collected as a recycled roadbed material of about 0 to 40 mm.

[0003]

However, since a pitch coating is formed on the surface of the asphalt mixture recycled aggregate obtained from the crushed asphalt waste as described above, such an asphalt mixture recycled aggregate is used. When used as an asphalt aggregate, there is a problem that oil mixed in with the pitch coating causes a problem in a manufacturing process of an asphalt mixture plant. In addition, since aggregates recovered from recycled subbase materials that have been regenerated only by crushing concrete waste materials have cement hydrates attached to them, their specific gravity is smaller than aggregates normally used for concrete, There was a problem that the water absorption was high and the amount of abrasion loss was large. Therefore, there is a problem that the utilization rate of these waste materials cannot be increased in the manufacturing process of the asphalt mixture plant. Therefore, there has been a strong demand in the industry for a method for efficiently recovering recycled single-grain crushed stones having higher quality than waste materials, and for creating a method for manufacturing recycled asphalt composite materials capable of efficiently recycling waste materials.

[0004]

According to the present invention, a raw material comprising asphalt waste material and / or concrete waste material is stored in a raw material receiving facility, and a cut-out facility is provided at a lower end outlet of the raw material receiving facility, and cut out by the cut-out facility. The raw material supplied to the primary sieving equipment is supplied to the primary sieving equipment. On the other hand, the raw material that cannot pass through the cutting equipment is supplied to the primary sieving equipment and crushed, and then supplied to the primary sieving equipment.
m and a raw material having a size of 30 mm or less, and the raw material having a size of more than 30 mm is supplied to a secondary crushing facility and supplied to a secondary crusher.
Crushed until the raw material becomes 30 mm or less.
Raw materials less than 10 mm separated by the next sieve
The raw material of 10 to 30 mm is supplied to a tertiary crusher to crush the raw material to a size of 20 mm or less, and the sieving equipment is removed after removing the pitch and cement hydrate coated on the crushed material. A method for recovering a reclaimed single-grain crushed stone having a specific gravity of at least 2.45 and a water absorption of 3.0% or less, and a reduced grinding loss of 30% or less; The recovered regenerated single-grain crushed stone and the new single-grain crushed stone are mixed at a ratio of 9: 1.
To the second raw material receiving facility, supply the asphalt mixture recycled aggregate to the third raw material receiving facility, and provide a transport device at the lower end discharge ports of the second and third raw material receiving facilities,
The raw material discharged from the lower end discharge ports of the second and third raw material receiving facilities is conveyed by this conveying device, and both are supplied to the heating and mixing device together with the additive, asphalt, and stone powder at a ratio of 7: 3, and heated and mixed. Then, after removing the dust generated at this time, a method for producing a recycled asphalt mixture using recycled single-grained crushed stone, characterized by obtaining a recycled asphalt mixture by supplying again to the mixing device and mixing. The recovered regenerated single-grain crushed stone and new single-grain crushed stone are supplied to the second raw material receiving facility at a ratio of 9: 1, and a conveying device is provided at a lower discharge port of the second raw material receiving facility. By conveying the raw material discharged from the lower end discharge port of the second raw material receiving facility and supplying it to the heating and mixing device and mixing it by heating, removing dust generated at this time, and then supplying the mixed material to the mixing device again to mix. By providing the playback asphalt mixture fabrication process, using a reproduced single particle size crushed stone, characterized in that to obtain the raw asphalt material to entirely solve the conventional problems described above.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A method for recovering recycled single-grain crushed stone from waste asphalt and / or concrete waste according to the present invention will be described below with reference to the drawings. FIG.
Is a process explanatory view showing an example of an embodiment of the present invention,
Hereinafter, the steps will be described with reference to FIG. Raw materials (29)
The asphalt mixture lump, roadbed waste lump, cement lump, concrete lump, etc. which are carried in as waste from the site are used, and the raw material (29) is stored in the hopper (1). Cutting equipment (2) at the lower outlet of the hopper (1)
Is provided. In this embodiment, a reciprocating feeder (trade name) is used as the cut-out equipment (2).
The raw material (29) is continuously cut out by a predetermined amount. The raw material cut out from the cutting equipment (2) is further sent to the next cutting equipment (3). As this cutting equipment (3),
In this embodiment, a grizzly feeder (trade name) is used, and the raw material cut out from the cutting equipment (2) is continuously cut out by a predetermined amount. The raw material having a size of 50 mm or less cut out by the cut-out equipment (3) is transported (4).
To the primary sieving equipment (13). An arbitrary device such as a belt conveyor is appropriately used as the transport device (4). This is the same for all the transfer devices used in the following steps. In addition, a magnetic separation device (5) is provided on the upper part of the transfer device (4).
Is removed.

On the other hand, the raw material having a size of 50 mm or more that cannot pass through the cutting equipment (3) is supplied to the primary crushing equipment (6) and crushed. Specifically, a jaw crusher is used as the primary crushing equipment (6), but an impeller breaker (trade name) is also preferably used.

[0008] The crushed material crushed by the primary crushing equipment (6) is supplied to a primary sieving equipment (9) via a transfer device (7). A magnetic separation device (8) is also provided above the transfer device (7), and iron scraps and the like (14) are removed.
In the primary sieving equipment (9), the crushed material is separated into those having a size of more than 30 mm and those having a size of less than 30 mm. 30 of these
Those exceeding mm are supplied to the secondary crushing equipment (11) by the transfer device (10). Secondary crushing equipment (1
As 1), in this embodiment, an impeller breaker (trade name) is used.

The crushed material crushed by the secondary crushing equipment (11) is again transferred to the transfer device (7) via the transfer device (12).
And supplied to the primary sieving equipment (9). In the primary sieving equipment (9), the crushed material is 30 mm as described above.
And those less than 30 mm. Here, for those exceeding 30 mm, the transfer device (1
0) to the secondary crushing equipment (11). That is, the above process is repeated until the crushed material exceeding 30 mm separated by the primary sieving equipment (9) becomes smaller than 30 mm in size.

[0010] 30m separated by the primary sieving equipment (9)
The crushed material having a size of less than m is separated by the fixed amount switching device (15) into one sent to the transfer device (16) and one sent to the transfer device (17). The crushed material sent to the conveying device (16) is a recycled crushed stone (R) of 0 to 30 mm as it is.
M-30: JIS A1102-1989). On the other hand, the crushed material sent to the transport device (17)
The crushed material is supplied to a secondary sieving facility (18) and is separated into crushed materials having a size of less than 10 mm and crushed materials having a size of 10 to 30 mm. The crushed materials having a size of less than 10 mm are recovered as a reclaimed crusher oran (RC-10). The crushed material of 10 to 30 mm is transported by the transport device (1
It is supplied to the tertiary crushing equipment (20) via 9). The tertiary crushing equipment (20) is for further crushing crushed material exceeding 20 mm to a size of not more than 20 mm and removing pitch and cement hydrate etc. coated on the crushed material. ), But
A super rounder (trade name) is also preferably used, and an apparatus such as a single toggle crusher, a cone crusher, a roll crusher, an impact crusher, a hammer crusher, a ball mill, a rod mill, a roller mill, a jet mill, or the like may be used. The pitch, cement hydrate and the like removed from the crushed material in the tertiary crushing equipment (20) are processed by a dust collector (24). In this embodiment, an air separator is used as the dust collector (24). The crushed material coming out of the tertiary crushing equipment (20) is supplied to the tertiary sieving equipment (22) by the transfer device (21).

[0011] In the tertiary sieving equipment (22), the supplied crushed material firstly exceeds 13 mm (13 to 20 mm).
And less than 13 mm, those of less than 13 mm are further classified into those of 5 to 13 mm and those of less than 5 mm, those of less than 5 mm are further those of 2.5 mm to 5 mm and less than 2.5 mm And separate. Classified 13
The crushed product (25) having a particle size of ２０20 mm is a crushed product (5-20 mm) having a size of 5 to 13 mm as No. 5 regenerated single crushed stone (RS-20)
6) can be reused as No. 6 recycled single-grain crushed stone (RS-13), and the crushed material (27) of 2.5 mm to 5 mm can be reused as No. 7 recycled single-grain crushed stone (RS-5).

Next, a method for producing a recycled asphalt mixture using the recovered single-grained crushed stone thus recovered will be described with reference to the process explanatory diagram of FIG. First, the hopper (3
0), the recycled single-grain crushed stone collected in the above process and the new single-grain crushed stone (31) cut from the mountain are supplied at a ratio of 9: 1, and the asphalt mixture recycled aggregate (conventionally) is supplied to another hopper (32). Recycled aggregate) (33). The lower end discharge ports of the hoppers (30) and (32) are provided with transport devices (34) and (35), respectively.

The raw materials discharged from the lower discharge ports of the hoppers (30) and (32) are conveyed by the conveying devices (34) and (35), and both are heated and mixed at a ratio of 7: 3 (36).
Supply to At the same time, the additive tank (37),
Additives, asphalt, and stone powder from the asphalt tank (38) and the stone powder silo (39) are heated and mixed (3
6). This additive is for restoring the altered asphalt properties and is commonly called a regeneration additive or softener.

As the heating and mixing device (36), a drum mixer is preferably used. In a drum mixer, a flame is blown from a high side of a rotary drum installed at an angle by a burner, and a heated high-temperature gas is blown from a low side. The raw material discharged from the hopper (30) is fed from the highest point of the drum mixer, and the raw material discharged from the hopper (32) is fed from the middle of the drum mixer. Released. Note that the heating temperature in the drum mixer is preferably about 160 ° C.

The high-temperature gas released from the lower end of the drum mixer is supplied to a double cyclone (42), a blower (43),
After the dust is removed in order through the dust collector (44), the dust is discharged from the chimney (45). On the other hand, the raw materials discharged from the lower end of the drum mixer are further mixed by a mixing device (for example, an after-mixer) (40) and loaded into a silo (41) as a regenerated asphalt mixture.

In the recycled asphalt mixture obtained through the above-described steps, waste material occupies 93% of the raw material as a result, and an extremely high waste material recycling rate can be obtained. In the above step, a method of obtaining a regenerated asphalt mixture without adding a regenerating additive by omitting the step of supplying the asphalt mixture regenerated aggregate (conventional regenerated aggregate) (33) can also be adopted ( (See FIG. 3). By using this method, the manufacturing process of the recycled asphalt mixture can be simplified, and the manufacturing efficiency can be increased.

[0017]

EXAMPLES The effects of the method for recovering recycled single-grain crushed stones according to the present invention will be further clarified by giving examples. However, the present invention is not limited at all by the following examples. (Example) Asphalt waste material, concrete waste material, and roadbed material carried in from the site are separated and recovered as regenerated single-grain crushed stone according to the process shown in FIG. 1, and 0 to 13 mm of the regenerated single-grain crushed stone is recovered. The residual asphalt content of single-grain crushed stone was investigated. Table 1 shows the survey results.

[0018]

[Table 1]

As shown in Table 1, the asphalt content was almost completely removed, but as the particle size became finer, the asphalt content tended to increase.

Therefore, in order to investigate the influence of the residual asphalt on plant machines (dryers, hot elevators, vibrating sieves, etc.) with respect to the single-grain crushed stones of the above-mentioned respective particle sizes, each single-grain crushed stone was heated at 110 ° C. in a constant temperature drier. After drying for 24 hours, visual observation was performed. Table 2 shows the observation results.

[0021]

[Table 2]

As shown in Table 2, with respect to the reclaimed single-grain crushed stone having a size of 2.5 mm or less, some solidification was observed.
No solidification was observed for the reclaimed single-grain crushed stone of 2.5 to 13 mm, and it seems that there is no problem in using it in a normal asphalt plant.

Further, the particle size of which no solidification was observed was 2.5
About 13 mm of regenerated single-grain crushed stone, specific gravity, water absorption,
Abrasion loss was measured according to JIS standards. Table 3 shows the measurement results.

[0024]

[Table 3]

As shown in Table 3, the particle size is 2.5 to 5 m.
The reclaimed single-grain crushed stone having a m of 5 to 13 mm has a standard value (specific gravity of 2. 1) of Japanese Industrial Standards (JIS A5001-1988).
45 or more, water absorption of 3.0% or less, and abrasion loss of 30% or less).

[0026]

As described above, the first aspect of the present invention relates to a raw material made of asphalt waste material and / or concrete waste material.
The raw material is stored in the raw material receiving facility, and a cut-out facility is provided at the lower end outlet of the raw material receiving facility. The raw material cut out by the cut-out facility is supplied to the primary sieving facility, while the raw material that cannot pass through the cut-out facility is supplied. After being supplied to the primary crushing equipment and crushed, it is supplied to the primary sieving equipment, and separated into raw materials exceeding 30 mm and raw materials of 30 mm or less by the primary sieving equipment, and the raw materials exceeding 30 mm are sent to the secondary crushing equipment. The mixture is supplied and crushed until it becomes 30 mm or less, and the raw material having a size of 30 mm or less is further separated by a secondary sieving apparatus to be separated into a raw material of less than 10 mm and a raw material of 10 to 30 mm.
mm of raw material is supplied to a tertiary crushing facility, crushed to 20 mm or less, and the pitch content and cement hydrate coated on the crushed material are removed and then separated by a tertiary sieving facility, and the specific gravity is at least 2.45 or more. The method for recovering crushed single-grain crushed stones is characterized by recovering crushed crushed single-grain crushed stones having a water absorption of 3.0% or less and a grinding loss of 30% or less, and has the following effects. In other words, it is necessary to efficiently recover high-quality recycled single-grain crushed stone that conforms to Japanese Industrial Standards from asphalt waste material discharged as a result of repairing paved roads and the like and concrete waste material discharged as a result of demolition of buildings. It can contribute to resource saving or natural environment conservation.

The second aspect of the present invention relates to asphalt waste material and / or
Alternatively, a raw material made of waste concrete is stored in a raw material receiving facility, and a cut-out facility is provided at a lower end discharge port of the raw material receiving facility, and the raw material cut out by the cut-out facility is supplied to a primary sieving facility and passed through the cut-out facility. The unsuccessful raw materials are supplied to the primary crushing equipment and crushed, and then supplied to the primary sieving equipment. The primary sieving equipment separates the raw materials exceeding 30 mm and the raw materials having a size of 30 mm or less. The raw material supplied to the secondary crushing equipment is crushed until the raw material becomes 30 mm or less, and the raw material of 30 mm or less is further separated by a secondary sieving equipment to be separated into a raw material of less than 10 mm and a raw material of 10 to 30 mm. After supplying to the tertiary crushing equipment and crushing to 20 mm or less and removing the pitch content and cement hydrate coated on the crushed material, 3
Separate by the next sieving equipment and have a specific gravity of at least 2.4.
5 or more, the water absorption is 3.0% or less, and the weight loss is 30%
Recycled crushed single-grain crushed stone described below is collected, and the recovered crushed single-grain crushed stone and new crushed single-grain crushed stone are supplied to the second raw material receiving facility at a ratio of 9: 1, and the asphalt mixture-recycled aggregate is recycled. 3 and a transfer device is provided at the lower discharge ports of the second and third raw material receiving facilities, and the transfer apparatus discharges the raw materials from the lower discharge ports of the second and third raw material receiving facilities. The raw materials are conveyed, and both are supplied to the heating and mixing device together with the additive, asphalt, and stone powder in a ratio of 7: 3, and heat-mixed. After dust generated at this time is removed, the mixture is again supplied to the mixing device and mixed. As a result, the following effects can be obtained. In other words, it is necessary to efficiently recover high-quality recycled single-grain crushed stone that conforms to Japanese Industrial Standards from asphalt waste material discharged as a result of repairing paved roads and the like and concrete waste material discharged as a result of demolition of buildings. In addition, a recycled asphalt mixture in which the ratio of waste material is extremely high can be produced from the recovered and regenerated single-grained crushed stone, which can contribute to resource saving or natural environment conservation.

According to a third aspect of the present invention, a raw material comprising asphalt waste material and / or concrete waste material is stored in a raw material receiving facility, and a cutout facility is provided at a lower end outlet of the raw material receiving facility, and the raw material cut out by the cutout facility is provided. Is supplied to the primary sieving equipment, while the raw materials that cannot pass through the cutting equipment are supplied to the primary crushing equipment, crushed and then supplied to the primary sieving equipment, and the raw materials exceeding 30 mm and 30 mm are supplied by the primary sieving equipment. The following raw materials are separated, and the raw materials exceeding 30 mm are supplied to a secondary crushing facility and crushed until the raw materials become 30 mm or less, and the raw materials of 30 mm or less are further separated by a secondary sieving facility to obtain raw materials of less than 10 mm and 10 to 30 mm.
The raw material of 10 to 30 mm is supplied to a tertiary crushing facility to be crushed to 20 mm or less, and the crushed material is removed to remove the pitch and / or cement hydrate. To recover recycled single-grain crushed stone having a specific gravity of at least 2.45, a water absorption of 3.0% or less, and a grinding loss of 30% or less. 9: 1 with crushed stone
To the second raw material receiving facility, and a transport device is provided at the lower discharge port of the second raw material receiving facility, and the raw material discharged from the lower discharge port of the second raw material receiving facility is transported by the transport device. Then, the mixture is supplied to a heating and mixing apparatus to be heated and mixed, dust generated at this time is removed, and then supplied to the mixing apparatus again to obtain a regenerated asphalt mixture, thereby obtaining a reclaimed single-grain crushed stone. Since the recycled asphalt composite material manufacturing method is used, the following effects can be further obtained in addition to the effects of the second aspect of the present invention. That is, a recycled asphalt mixture in which the proportion of waste material is extremely high can be produced without requiring any additives, so that the process for producing a recycled asphalt mixture can be simplified.

[Brief description of the drawings]

FIG. 1 is a process explanatory view showing an example of an embodiment of a method for recovering recycled single-grain crushed stone according to the present invention.

FIG. 2 is a process explanatory view showing an example of an embodiment of the method for producing a recycled asphalt mixture according to the present invention.

FIG. 3 is a process explanatory view showing an example of an embodiment of the method for producing a recycled asphalt mixture according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 First raw material receiving equipment 2, 3 Cutting-out equipment 6 Primary crushing equipment 9, 13 Primary sieving equipment 11 Secondary crushing equipment 18 Secondary sieving equipment 20 Tertiary crushing equipment 22 Tertiary sieving equipment 30 Second raw material receiving Equipment 32 Third raw material receiving equipment 34, 35 Transfer device 36 Heating and mixing device 40 Mixing device

Claims (3)

(57) [Claims] 1. A raw material comprising asphalt waste material and / or concrete waste material is stored in a raw material receiving facility, a cutout facility is provided at a lower end discharge port of the raw material receiving facility, and the raw material cut out by the cutout facility is subjected to a primary sieving facility. Supply to
On the other hand, the raw materials that cannot pass through the cutting equipment are supplied to the primary crushing equipment, crushed, and then supplied to the primary sieving equipment.
The raw material exceeding 30 mm and the raw material having a size of 30 mm or less are separated by the next sieving equipment, and the raw material exceeding 30 mm is supplied to a secondary crushing equipment and crushed until the raw material has a size of 30 mm or less.
The raw material having a diameter of 10 mm or less is further separated by a secondary sieve to separate the raw material having a diameter of less than 10 mm into a raw material having a diameter of 10 to 30 mm. After removing the pitch and / or cement hydrate coated on the material, it is separated by tertiary sieving equipment. The specific gravity is at least 2.45, the water absorption is 3.0% or less, and the grinding loss is 30% or less. A method for collecting reclaimed single-grain crushed stones, comprising recovering regenerated single-grain crushed stones. 2. A raw material comprising asphalt waste material and / or concrete waste material is stored in a raw material receiving facility, and a cutout facility is provided at a lower end discharge port of the raw material receiving facility, and a raw material cut out by the cutout facility is subjected to a primary sieving facility. Supply to
On the other hand, the raw materials that cannot pass through the cutting equipment are supplied to the primary crushing equipment, crushed, and then supplied to the primary sieving equipment.
The raw material exceeding 30 mm and the raw material having a size of 30 mm or less are separated by the next sieving equipment, and the raw material exceeding 30 mm is supplied to a secondary crushing equipment and crushed until the raw material has a size of 30 mm or less.
The raw material having a diameter of 10 mm or less is further separated by a secondary sieve to separate the raw material having a diameter of less than 10 mm into a raw material having a diameter of 10 to 30 mm. After removing the pitch and / or cement hydrate coated on the material, it is separated by tertiary sieving equipment. The specific gravity is at least 2.45, the water absorption is 3.0% or less, and the grinding loss is 30% or less. Recovered crushed single-grain crushed stone, and the recovered crushed single-grain crushed stone and new crushed single-grain crushed stone are supplied to the second raw material receiving facility at a ratio of 9: 1, and the asphalt mixture recycled aggregate is converted into the third raw material. A transfer device is provided at the lower discharge ports of the second and third raw material receiving facilities for supplying the raw material discharged from the lower discharge ports of the second and third raw material receiving facilities. I Both are supplied to the heating and mixing device together with the additive, asphalt, and stone powder in a ratio of 7: 3 to be heated and mixed. After dust generated at this time is removed, the mixed material is again supplied to the mixing device and mixed to produce a regenerated asphalt mixture. A method for producing a recycled asphalt mixture using recycled single-grained crushed stones, characterized in that: 3. A raw material comprising asphalt waste material and / or concrete waste material is stored in a raw material receiving facility, a cutout facility is provided at a lower end discharge port of the raw material receiving facility, and a raw material cut out by the cutout facility is subjected to a primary sieving facility. Supply to
On the other hand, the raw materials that cannot pass through the cutting equipment are supplied to the primary crushing equipment, crushed, and then supplied to the primary sieving equipment.
The raw material exceeding 30 mm and the raw material having a size of 30 mm or less are separated by the next sieving equipment, and the raw material exceeding 30 mm is supplied to a secondary crushing equipment and crushed until the raw material has a size of 30 mm or less.
The raw material having a diameter of 10 mm or less is further separated by a secondary sieve to separate the raw material having a diameter of less than 10 mm into a raw material having a diameter of 10 to 30 mm. After removing the pitch and / or cement hydrate coated on the material, it is separated by tertiary sieving equipment. The specific gravity is at least 2.45, the water absorption is 3.0% or less, and the grinding loss is 30% or less. Recovered crushed single-grain crushed stone, and supplies the recovered crushed single-grain crushed stone and new crushed single-grain crushed stone to the second raw material receiving facility at a ratio of 9: 1. Is provided with a conveying device, and the conveying device conveys the raw material discharged from the lower end discharge port of the second raw material receiving facility, supplies the raw material to the heating / mixing device, heat-mixes, removes dust generated at this time, and then again Play asphalt mixture fabrication method using the reproduced single particle size crushed stone, characterized in that to obtain a recycled asphalt mixture material by mixing supplied to the coupling device.