JP3126965B1 - Asphalt mixture, production method and production apparatus - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To effectively utilize thermal energy when decomposing and removing pollutants contained in contaminated soil, and to use the obtained purified soil to make a chemically stable and environmentally safe asphalt mixture. Is provided at low cost. SOLUTION: High-temperature purified soil from which contaminants are decomposed and removed by high-temperature heat treatment is mixed with supplementary aggregate, and the supplementary aggregate is dried and heated to obtain an aggregate-mixed soil.
Asphalt is mixed with the aggregate-mixed soil. The asphalt mixture is produced by mixing the high-temperature purified soil with the supplementary aggregate, drying and heating the supplementary aggregate, and obtaining the aggregate-mixed soil while obtaining the drying / heating mixer 12 and the drying / heating mixer 12. Asphalt mixture manufacturing apparatus 10 having an asphalt mixing mixer 13 for mixing asphalt mixture with mixed aggregate mixed soil and asphalt
Can be done with

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a purified soil from which pollutants are decomposed and removed, an asphalt mixture containing supplementary aggregate and asphalt, and a method and an apparatus for producing the same, so that the purified soil can be effectively used at low cost. It was made.

[0002]

2. Description of the Related Art Pollutants such as dioxins generated from garbage incinerators and metal smelting processes cause air pollution, soil pollution, and the like, and have become a social problem. Conventionally, soil containing such contaminants has been heated at a high temperature of 1000 ° C. or higher to purify the soil by decomposing and removing the contaminants.

[0003]

However, when the soil containing the contaminant is heated to decompose and remove the contaminant, the soil is heated at a high temperature of 1000 ° C. or more, and large heat energy is required. Waste heat was not used effectively, and there was a problem in terms of energy cost and energy saving.

The present invention has been made in view of the above circumstances, and effectively utilizes heat energy when decomposing and removing contaminants contained in contaminated soil, and uses the obtained purified soil to perform chemical treatment. It is an object to provide an asphalt mixture which is stable and environmentally safe at low cost.

[0005]

The method for producing an asphalt mixture of the present invention is characterized in that a high-purified soil from which contaminants are decomposed and removed by a high-temperature heat treatment at 1000 ° C. or more is mixed with a supplementary aggregate to produce a high-purified soil. By utilizing the stored heat, the supplementary aggregate is dried and heated, an aggregate-mixed soil is obtained, and then the asphalt is mixed into the aggregate-mixed soil. The asphalt mixture production device of the present invention,
Contaminants by mixing high-temperature purifying soil and supply aggregate, which is decomposed and removed by the high-temperature heat treatment above 1000 ° C., high-temperature conversion soil
An aggregate mixing mixer for drying and heating the supplementary aggregate by using the heat storage of the aggregate and obtaining an aggregate mixed soil,
It is characterized by having an asphalt mixing mixer that obtains an asphalt mixture by mixing the asphalt mixture with the aggregate mixed soil obtained by the aggregate mixing mixer.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
FIG. 1 is a schematic configuration diagram schematically showing one embodiment of the asphalt mixture production apparatus 10 of the present invention, in which high-temperature purified soil and supplementary aggregate are mixed to utilize the heat storage of the high-temperature purified soil.
An aggregate mixing mixer 12 for drying and heating the supplementary aggregate and obtaining an aggregate mixed soil, and an asphalt mixing mixer for mixing the aggregate mixed soil obtained by the aggregate mixed mixer 12 and asphalt to obtain an asphalt mixture. 1
3 The aggregate mixing mixer 12 is connected to a heating / purifying apparatus 11 for heating and contaminating the contaminated soil containing a pollutant such as dioxin, and the high-temperature purified soil obtained by the heating / purifying apparatus 11 is heated to a high temperature. In the state
It is supplied to the aggregate mixing mixer 12.
In this case, the heating temperature of the contaminated soil in the heating and purification device 11 is usually 1000 ° C. or higher. The asphalt mixing mixer 13 is connected to the aggregate mixing mixer 12,
The aggregate mixed soil obtained by this aggregate mixing mixer 12 is
Asphalt mixing mixer 12 while heated
It is supplied to.

Next, this asphalt mixture production apparatus 1
A method for producing an asphalt mixture using 0 will be described. First, supply aggregate for asphalt concrete, such as sand, gravel, crushed stone, and filler, is charged into the aggregate mixing mixer 12 at room temperature. After that, the high temperature purified soil of 1000 ° C. or more treated by the heating and purifying device 11 is boned.
The high-purity soil is mixed with the supplementary aggregate in the mixer 12 to obtain an aggregate-mixed soil.

[0008] In this case, the high-temperature purified soil is kept in the high-temperature state heated by the heat purification device 11 and the aggregate mixing mixer 1.
2 is supplied. Therefore, by mixing the high-temperature purified soil with the normal-temperature supplementary aggregate, the moisture contained in the supplementary aggregate is vaporized, and the supplementary aggregate is dried and heated to an appropriate temperature. Therefore, the supply aggregate can be dried and heated without providing a heating facility in the aggregate mixing mixer 12. Here, the mixing ratio of the high-temperature purified soil and the supplementary aggregate is such that the supplementary aggregate can be sufficiently dried and heated to an appropriate temperature, and the finally obtained asphalt mixture can be used as a pavement material for roads or the like. Is appropriately set so that the particle size distribution satisfies an appropriate particle size curve. The temperature of the aggregate-mixed soil obtained here is usually set to be about 300 to 400 ° C.

As described above, the aggregate mixing mixer 12 is connected to the heating / purifying device 11 and the high-temperature purified soil is mixed with the replenished aggregate at room temperature while maintaining the high temperature state, thereby utilizing the heat storage of the high-temperature purified soil. The supplementary aggregate can be dried and heated. Therefore, there is no need to separately provide a facility for drying and heating the supplementary aggregate, which is preferable because heat energy can be effectively used.

The shape of the aggregate mixing mixer 12 is not particularly limited as long as the high-temperature purified soil and the supplementary aggregate at room temperature can be sufficiently brought into contact with each other and heat can be efficiently exchanged. The vertical mixer 12a shown in FIG. 2 and the inclined mixer 12b shown in FIG. 3 are preferable. These mixers 12a and 12b have a cylindrical container 15 that rotates in the circumferential direction about the axis 14 as a rotation axis. A soil input port 16 is provided at an upper portion of the container 15 and a soil discharge port 17 is provided at a lower portion thereof. ing. Further, a gas blowing port 18 for blowing high-pressure air into the container 15 to promote drying of the supplementary aggregate is provided at a lower portion of the container 15, and a container 15 is provided at an upper portion of the container 15.
An exhaust port 19 from which the gas inside is exhausted is provided. In such mixers 12a and 12b, the high-temperature purified soil introduced from the soil inlet 16 is supplied to the mixer 12a and 12b.
By rotating a and 12b, it descends while rotating inside the container 15, and at the same time comes into contact with the supply aggregate in the mixers 12a and 12b. Therefore, the contact area and the contact time with the supplementary aggregate charged in the mixers 12a and 12b are large, and the supplementary aggregate can be efficiently dried and heated. The high-temperature purified soil and the dried and heated replenishment aggregate are mixed, and the mixture is discharged as an aggregate-mixed soil from the soil discharge port 17. The exhaust ports 19 of the mixers 12a and 12b may be provided with an exhaust device (not shown) so that a gas such as water vapor generated by drying of the supply aggregate is efficiently exhausted to the outside of the mixer. .

The aggregate mixed soil obtained by the aggregate mixing mixer 12 is supplied to the asphalt mixing mixer 13 while being heated to about 160 to 170 ° C., while the asphalt mixing mixer 13 is supplied to the asphalt mixing mixer 13. Asphalt of about 180 ° C. is introduced. In the asphalt mixing mixer 13, an asphalt mixture of about 160 ° C. is obtained by sufficiently mixing the aggregate-mixed soil and the asphalt. Here, the mixing ratio of the aggregate-mixed soil and the asphalt is appropriately set so that the obtained asphalt mixture has an appropriate temperature and has a strength required as a pavement material for roads and the like. The shape of the asphalt mixing mixer 13 is not particularly limited, and may be a commonly used inclined mixer, pug mill mixer, or the like.

[0012] The asphalt mixture thus obtained becomes a chemically stable and environmentally safe asphalt mixture since the surface of the aggregate-mixed soil is covered with asphalt. This asphalt mixture is used as a pavement material for roads, parking lots, sidewalks and the like, is spread on a subgrade having a sufficient supporting force, and is pressed and rolled in the same manner as ordinary asphalt mixture.

[0013]

As described above, the method for producing an asphalt mixture according to the present invention comprises mixing high-temperature purified soil from which contaminants are decomposed and removed by high-temperature heat treatment at 1000 ° C. or more with supplementary aggregate. Then, the supplementary aggregate is dried and heated using the heat storage of the high-temperature purified soil to obtain the aggregate-mixed soil, and then the asphalt is mixed with the aggregate-mixed soil. Can effectively utilize thermal energy when decomposing and removing contaminants contained in water, and use the obtained purified soil to provide a chemically stable and environmentally safe asphalt mixture at low cost. . The obtained asphalt mixture can be used for pavement of roads and the like, like the ordinary asphalt mixture, and thus can be effectively used even when a large amount of purified soil is generated. Further, the asphalt mixture production apparatus of the present invention mixes the high-purified soil and the supplementary aggregate in which the contained contaminants are decomposed and removed by the high-temperature heat treatment at 1000 ° C. or higher, and utilizes the heat storage of the high-temperature purified soil. aggregate mixed to obtain aggregate soil mixture with drying and heating the supply aggregate
And if a mixer, so is characterized by having the aggregate mixture soil and asphalt obtained in the aggregate a mixer to mix asphalt mixture mixer to obtain a asphalt mixture, to obtain efficient asphalt mixture at low cost Can be.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of an asphalt mixture production device of the present invention.

FIG. 2 is a schematic view showing one embodiment of an aggregate mixing mixer used in the asphalt mixture production device of the present invention.

FIG. 3 is a schematic view showing another embodiment of the aggregate mixing mixer used in the asphalt mixture production device of the present invention.

[Explanation of symbols]

10: asphalt mixture production equipment 12: aggregate mixing mixer 13: asphalt mixing mixer

Claims (3)

(57) [Claims] 1. A high-purity soil from which contaminants are decomposed and removed by a high-temperature heat treatment at 1000 ° C. or more is mixed with a supplementary aggregate, and the supplementary aggregate is dried and heated by utilizing the heat storage of the high-temperature purified soil. A method for producing an asphalt mixture, comprising: obtaining an aggregate-mixed soil together with the asphalt; and mixing asphalt into the aggregate-mixed soil. 2. A high-purity soil obtained by decomposing and removing contaminants by a high-temperature heat treatment at a temperature of 1000 ° C. or more is mixed with a supplementary aggregate, and the stored heat of the high-temperature purified soil is used to dry and heat the supplementary aggregate. characterized in that it has and aggregate mixture <br/> mixer to obtain aggregate soil mixture, the aggregate mixture soil and asphalt obtained in the aggregate a mixer and mixed to obtain a asphalt mixture asphalt mixture mixer with Asphalt mixture production equipment. 3. An asphalt mixture produced by the production method according to claim 1.