KR101806338B1 - manufacturing method of fine aggregate using aluminium waste dust and concrete block - Google Patents

Abstract

The present invention relates to a method for manufacturing a fine aggregate using aluminum dust and a concrete block using the same, and more specifically, to a method for manufacturing a fine aggregate capable of recycling waste as a useful resource by manufacturing a fine aggregate from aluminum dust generated in an industrial site And a concrete block using the same.
The method for producing a fine aggregate using aluminum waste dust according to the present invention comprises a collection step of recovering aluminum dust particles generated in an aluminum melting furnace and collected in a dust collector, a separation step of separating foreign matter by passing the waste dust through water, And a sintering step of sintering the spherical shaped body obtained in the molding step.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a fine aggregate using aluminum dust,

The present invention relates to a method of manufacturing a fine aggregate using aluminum dust, a remittal and a concrete block using the same, and more particularly, to a method of manufacturing a fine aggregate by using aluminum dust generated in an industrial site, The present invention relates to a method for manufacturing a fine aggregate and a remiteral and concrete block using the same.

Concrete usually refers to a mixture of coarse aggregate such as cobbles and fine aggregate such as sand in cement, kneaded with water, or hardened.

As for the fine aggregate, according to the concrete standard specification, the weight percentage of the aggregate passing through the sieve body of the sieve is 10 mm 100%, 5 mm 95-100%, 2.5 mm 80-100%, 1.2 mm 50-85% It is an aggregate that satisfies the particle size distribution of 60%, 0.3mm 10-30% and 0.15mm 2 ~ 10%. In addition, it is clean, strong, durable, dust, soil, organic impurities, salt Should not contain any harmful substances.

In addition, the shape should be a cubic shape or a shape close to a sphere, and it should have a surface structure having a large adhesion force with cement. If it is too light, there is a risk of material separation. Therefore, .

Although the steel sand used in the above-mentioned fine aggregate material is principally used, the use amount of the steel sand is gradually decreasing from the viewpoint of environmental protection. In order to replace this, the use amount of the sea sand, crushed sand or reclaimed sand is gradually increasing to be. However, even in the case of sea sand, similar to river sand, it may cause coastal destruction. Therefore, the sampling method is changed from the sampling near the coast to the ocean sampling method, And there are many disadvantages such as the desire of the city.

Alternative aggregates such as blast furnace slag aggregate, copper slag aggregate and lead slag slag have been developed as part of efforts to replace conventional sand fine aggregate.

Korean Patent Registration No. 10-0797297 discloses a slag for replacing fine aggregate of concrete and a concrete composition having excellent durability including the same, and Korean Patent No. 10-1222076 discloses a concrete composition containing a blast furnace slag aggregate .

Although slag is a useful waste material, it has recently become wider in terms of utilization of slag and demand for it, which is disadvantageous from the aspect of original activity and cost of supply and demand.

On the other hand, in general aluminum die casting (casting) or casting operation, aluminum must be melted by high heat of about 700 ℃ or more. In most cases, aluminum melting furnace is installed separately to dissolve aluminum ingot or scrap. It is well known that they are injected one by one.

Aluminum is collected in the dust collector together with dust, which is generated in the melting process of aluminum in the melting furnace. The dust collected in this manner is usually not recycled but buried in the ground for disposal.

However, aluminum dust particles contain aluminum particles, aluminum oxide particles, aluminum nitride particles and the like in addition to dust, so waste disposal causes waste of useful resources. In addition, the buried aluminum dust dust is in contact with moisture in the ground to generate ammonia, which hinders the surrounding environment.

1. Korean Patent Registration No. 10-0797297: Slag for replacing concrete fine aggregate and concrete composition having excellent durability 2. Korean Registered Patent No. 10-1222076: Concrete composition containing blast furnace slag aggregate

The present invention has been made to solve the above problems, and it is an object of the present invention to provide a method of manufacturing a fine aggregate which can recycle waste as a useful resource by manufacturing fine aggregate using aluminum dust generated in an industrial site, and providing remitrals and concrete blocks using the same The purpose is to do.

In order to accomplish the above object, the present invention provides a method of manufacturing a fine aggregate using aluminum dust, comprising: a recovery step of recovering aluminum dust collected in an aluminum melting furnace and collected in a dust collector; A separating step of separating the foreign matter by passing the waste dust through water; A molding step of molding a remnant in which the foreign substance is separated in the separating step into a spherical shape; And a firing step of firing the spherical shaped body obtained in the forming step.

And a mixing step of adding and mixing fly ash or bottom ash to the remnant after the separating step.

Wherein the separating step comprises connecting the conveying pipe provided with the rotating conveying screw to the water tank in which the water is stored to allow the conveying screw to pass through the inside of the water tank and then conveying the waste powder through the conveying pipe, So that the foreign matter in the waste dust is floated on the water surface.

The separating step is characterized in that at least one selected from the waste ceramic powder, the wastewater sludge powder, the wastepaper, the waste filter paper and the waste powder is passed through the water together with the waste powder.

In order to attain the above object, the remiter of the present invention is formed by blending cement, stone powder, and water in the fine aggregate produced by the above method.

In order to accomplish the above object, the concrete block of the present invention is characterized in that it is formed by remittance.

As described above, according to the present invention, it is possible to recycle waste as a useful resource by manufacturing a fine aggregate by using aluminum waste dust to be disposed of, and it is economical because the production cost can be lowered.

The fine aggregate prepared according to the present invention is very useful for producing a concrete block having high strength and light weight properties.

1 is a block diagram schematically showing a method of manufacturing a fine aggregate according to an embodiment of the present invention,
2 is a block diagram schematically showing a method of manufacturing a fine aggregate according to another embodiment of the present invention,
3 is a schematic view showing a configuration of a foreign matter separator used in the present invention,
FIG. 4 is a cross-sectional view showing the interior of the water tank applied to FIG. 3,
FIG. 5 is a schematic view illustrating a method of manufacturing a fine aggregate according to another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, a detailed description will be given of a method for manufacturing a fine aggregate using aluminum dust particles according to the present invention, a remittal and a concrete block using the same.

Referring to FIG. 1, a method of manufacturing a fine aggregate using aluminum dust particles according to an embodiment of the present invention includes a collecting step of collecting aluminum dust particles, a separating step of separating foreign matter from the pulverized dust, A squeeze step of sintering the spherical shaped body, and a sintering step of sintering the spherical shaped body. It will be explained step by step.

1. Recovery stage

First, aluminum dust is recovered. In the present invention, aluminum dust particles are dust collected in a melting furnace for dissolving aluminum through a dust collector. Generally, in a room provided with an aluminum melting furnace, a dust collector is installed to remove dust generated in the melting process of aluminum and dust in the room. The aluminum dust collected in the dust collector contains various foreign substances such as dust, aluminum (Al) fine particles, and aluminum oxide (Al ₂ O ₃ ) fine particles. Aluminum oxide is generated by contact with oxygen while dissolving aluminum. Aluminum and aluminum oxide can typically account for about 20 to 50 weight percent of the total aluminum waste dust.

2. Separation step

Next, the foreign substance is removed from the recovered aluminum dust. Dirt or oil may be used as a foreign substance. The oil may be attached mainly to the particle surface of the waste dust.

In order to effectively separate foreign matter, the present invention separates foreign matter by contacting the aluminum pulverized dust with water. As an example, aluminum dust is passed through water to remove dust or oil.

An example of a foreign matter separator for removing foreign substances by passing the recovered aluminum dust through water is shown in FIGS. 3 and 4. FIG.

3 and 4, the foreign material separator includes a feed hopper 10 into which the recovered aluminum dust is injected, a first feed pipe 20 connected to the feed hopper 10, a first feed pipe 20 A second conveyance pipe 30 connected to an end of the first conveyance pipe connected to the water tank and a third conveyance pipe 40 connected to the second conveyance pipe 30, do.

The recovered aluminum dust is injected into the input hopper 10. It is needless to say that a valve capable of opening and closing can be provided at the discharge port of the charging hopper 10. A connection pipe (15) is provided at an outlet of the charging hopper (10) and extends downward.

A first conveyance pipe (20) is connected to a lower portion of the connection pipe (15). The first transfer pipe (20) is horizontally installed toward the water tank (50). A conveying screw (25) is installed inside the first conveyance pipe (20).

The conveying screw 25 is composed of a rotary shaft 27 and a blade 29 formed in a spiral shape on the outer peripheral surface of the rotary shaft 27. The rotating shaft 27 is connected to the driving motor and rotated by driving of the driving motor. Since the structure of the conveying screw 25 is a well-known technique, a detailed description thereof will be omitted.

When the conveying screw 25 rotates, aluminum pulverized dust is conveyed along the first conveyance pipe 20.

The water tank 50 has a rectangular tubular shape, and water is stored therein. A scum skimmer for removing floating matters floating on the water surface, oil, etc. may be installed on the upper part of the water tank 50. The bottom surface of the water tank 50 is formed with a bottom tube portion 55 that protrudes downward convexly and provides a space through which the feed screw 25 passes.

The first conveyance pipe 20 is connected to the front and rear surfaces of the water tank 50 and connected to the bottom pipe portion 55 in a straight line. The transfer screw 25 is installed long from one side of the first transfer pipe 20 to the other side. The transfer screw 25 is located in the bottom tube portion 55 when passing through the inside of the water tank 50. [ At the bottom edge of the water tank 50, a swash plate 57 is provided on the left and right sides, respectively.

The aluminum waste dust discharged from the input hopper 10 flows into the water tub 50 while moving along the first conveyance pipe 20. Aluminum waste dust that has flowed into the water tank 50 is conveyed while being continuously stirred by the conveying screw 25. [ Foreign substances such as dust, oil and the like having a light specific gravity out of the aluminum dust particles conveyed in the water tub 50 rise to the water surface. The residue 5 from which the foreign substance is removed is discharged to the first conveyance pipe 20 coupled to the rear surface of the water tank 50 together with the water. The remnant moving along the first conveyance pipe (20) flows into the third conveyance pipe (40) through the second conveyance pipe (30).

A rotating conveying screw may be installed in the third conveyance pipe 40 to move the remnant. The remnant moving along the third conveyance pipe 40 is introduced into a molding machine to be described later.

On the other hand, in the separation step, other wastes can be put in the hopper together with aluminum dust. For example, the waste may be at least one selected from waste ceramic powder, wastewater sludge powder, waste plaster, waste plaster, and waste powder. These wastes use powders milled to 100-300 mesh size. The waste may be introduced into the feed hopper at a rate of 10 to 100 parts by weight based on 100 parts by weight of the aluminum waste powder. Aluminum waste dust and wastes introduced into the input hopper pass through the water by the conveying screw and move along the second and third conveyance pipes.

3. Forming step

The remnants of the aluminum waste dust from which the foreign substance is separated in the separation step are formed into a granular or pellet-like granular shaped body using a molding machine.

A conventional pelletizer 60 may be used as the molding machine. When the remnants are supplied into the rotating fan 65 of the pelletizer 60, the particles gradually grow and granulate while the mixture flows inside the fan of the pelletizer. The granulation process by the pelletizer is influenced by the granularity due to factors such as the number of revolutions, tilt, and rotation time of the pelletizer pan. To maintain proper assemblability, the number of revolutions of the pelletizer may be 10 to 50 rpm, the inclination angle of 20 to 40 degrees, and the rotation time of 1 to 10 minutes.

An injection nozzle 70 may be installed on the upper portion of the fan 65 so as to supply water into the pelletizer fan 65.

4. Firing step

Next, the formed body obtained in the forming step is baked. As an example of the calcination, calcining is carried out at 1000 to 1200 ° C for 1 to 6 hours to finally obtain a fine aggregate. It is needless to say that the fine aggregate can be further sorted by size according to need.

On the other hand, it is needless to say that the molding and firing steps described above can be carried out through a rotary kiln. That is, when the residual material discharged from the third conveyance pipe is injected into the rotary rotary kiln, the rotary kiln can be granulated and fired at the same time.

FIG. 5 shows a process of granulating and calcining in a rotary kiln and discharging in the form of a fine aggregate.

Referring to FIG. 5, the remnants of aluminum dust that is moved through the third conveyance pipe are introduced into the rotating rotary kiln 80. The rotary kiln (80) is connected to the burner (83), and hot heat is introduced into the inside thereof. Inside the rotary kiln (80), the residues are granulated and fired simultaneously.

The calcined fine aggregate is charged into the fine aggregate charging hopper 90 and the fine aggregate charged into the charging hopper 90 is supplied to the sorter 100 by the conveying conveyor 95. In the sorter 100, the mesh drum 105 having a rotating net structure is installed to be inclined. The fine aggregate smaller than the mesh size of the mesh drum 105 among the fine aggregates charged into the mesh drum 105 falls on the first fine aggregate conveyor 107 located below the mesh drum 105 and the size of the mesh of the mesh drum 105 The larger fine aggregate falls to the second fine aggregate conveyor 109 through the outlet provided on the rear surface of the mesh drum.

Fine aggregates having a small size and fine aggregates having a large size can be mixed at a suitable ratio or can be used according to each use.

The fine aggregate produced by the present invention can be blended with cement, stone, and water to make remitars. Remitals are also called concrete.

As an example of the remiteral, 200-300 parts by weight of the abrasive, 200-300 parts by weight of the fine aggregate and 200-400 parts by weight of water are mixed with 100 parts by weight of the cement. The concrete can be made by pouring the remitar into a mold and curing it. Concrete blocks include bricks, tiles, and architectural finishes.

The concrete block produced in this way has increased strength and weight and has high strength and light weight characteristics compared to conventional concrete blocks.

Meanwhile, as another embodiment of the present invention, it is possible to further perform a mixing step of mixing fly ash or bottom ash with the remnants conveyed along the third conveyance pipe by injecting fly ash or bottom ash into the third conveyance pipe. Fly ash or 2 to 10 parts by weight of bottom ash may be mixed with 100 parts by weight of the residue.

The fly ash or bottom ash introduced into the third conveyance pipe is mixed with the remnants evenly by the rotation of the conveying screw and is introduced into the molding machine.

Fly ash is a fine powder collected from coal-fired thermal power plants. And the bottom ash is attached to the wall, superheater, reheater, etc of the thermal power plant, and it is taken off to the bottom of the boiler by its own weight. Fly ash and bottom ash have excellent properties as a binder material together with cost reduction by resource recycling. Fly ash and bottom ash are fine hydraulic powders in the form of fine powders mainly composed of silica (SiO ₂ ) and alumina (Al ₂ O ₃ ). They are mixed with the residues of aluminum dust to increase the molding density and densify the structure. The forming rate and the compressive strength can be greatly increased.

On the other hand, in the above-described example, a method of manufacturing a fine aggregate using aluminum waste dust has been described. Alternatively, waste powder such as slag may be passed through water in place of aluminum waste dust to form a sphere, Can be produced.

For example, the slag powder is injected into the input hopper 10 and passes through the first conveyance pipe 20, so that foreign substances such as dust, oil and the like having a light specific gravity rise from the slag powder to the water surface. The remnant having the foreign substance removed is discharged to the first conveyance pipe 20 coupled to the rear surface of the water tank 50 together with the water. The remnant moving along the first conveyance pipe 20 flows into the third conveyance pipe 40 through the second conveyance pipe 30 and is discharged to the molding machine. The remnant charged into the molding machine such as a rotary kiln is granulated and calcined to produce a fine aggregate.

Hereinafter, the present invention will be described with reference to experimental examples. However, the following experimental examples are intended to illustrate the present invention in detail, and the scope of the present invention is not limited to the following experimental examples.

(Example)

Aluminum waste collected through a dust collector installed in an aluminum melting furnace was separated by using a separator shown in FIG. 3, and then fly ash was added thereto. Thus, 100 parts by weight of aluminum dust residue was mixed with 6 parts by weight of fly ash Was formed into a spherical shape in a pelletizer and then calcined at 1000 ° C for 6 hours to prepare a fine aggregate.

Then, the compressive strength test of a large crate (example) made of a concrete composition containing the manufactured fine aggregate was conducted. The concrete composition was prepared by blending 250 parts by weight of limestone, 250 parts by weight of fine aggregate, 300 parts by weight of water and 1 part by weight of an admixture (polycarboxylic acid-based) with respect to 100 parts by weight of cement.

For comparison, concrete (comparative example) was made of a concrete composition using ordinary sand instead of the above-mentioned fine aggregate. The concrete composition for comparison was prepared by blending 250 parts by weight of limestone, 250 parts by weight of sand, 300 parts by weight of water and 1 part by weight of an admixture (polycarboxylic acid) based on 100 parts by weight of cement.

The compressive strength test of concrete was carried out by the method specified in Korean Industrial Standard (KS) F 2405. In order to evaluate the results, the specimens having a diameter of 10 cm and a height of 20 cm manufactured by compaction method of Korean Industrial Standard (KS) F 2403 were manufactured and the compressive strength of the specimens was measured and shown in Table 1 below.

division 3 day strength (MPa) 7 days Strength (MPa) 28 day strength (MPa) Example 15.7 26.1 40.5 Comparative Example 19.6 28.3 41.8

Referring to the results shown in Table 1, the initial strength was much lower than that of the comparative example, but the strength was increased with time, and there was no difference from the comparative example at the strength on the 28th day. Therefore, it is considered that it is sufficiently possible to manufacture concrete convexes having high strength by using the fine aggregate produced according to the present invention.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

10: Feed hopper 20: 1st feed pipe
25: Feed screw 30: Second feed pipe
40: Third conveying pipe 50: Water tank
60: Pelletizer 70: Injection nozzle

Claims (6)

A recovery step of recovering aluminum dust particles generated in an aluminum melting furnace and collected in a dust collector;
A separating step of separating the foreign matter by passing the waste dust through water;
A molding step of molding a remnant in which the foreign substance is separated in the separating step into a spherical shape;
And a firing step of firing the spherical shaped body obtained in the forming step,
The separation step is performed by a foreign matter separator,
The foreign matter separator includes a charging hopper into which the waste powder is injected, a connection pipe installed at a discharge port of the charging hopper and extending downward, and a transfer screw connected to a lower portion of the connection pipe, And a second conveyance pipe connected to the first conveyance pipe and connected to the end of the first conveyance pipe connected to the water tank, and a second conveyance pipe connected to the first conveyance pipe, A second conveyance pipe and a third conveyance pipe connected to the second conveyance pipe,
A bottom tube part protruding downward to protrude downward from the bottom of the water tank to provide a space through which the feed screw passes and connected to the first feed pipe in a straight line is formed and a swash plate is provided on the left and right sides of the bottom corner of the water tank Lt; / RTI &
Wherein the separation step comprises bringing the water and the waste dust into contact with each other while the waste dust is being transferred through the first transfer pipe to float the foreign substances in the waste dust to the water surface. . The method of claim 1, further comprising a mixing step of adding and mixing fly ash or bottom ash to the remnant after the separating step. delete The method according to claim 1, wherein the separating step comprises passing at least one selected from waste ceramic powder, wastewater sludge powder, waste sand, waste filter paper, and waste powder together with the waste dust in water. Method of manufacturing fine aggregate used. delete delete

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