KR101015239B1 - Aluminium deoxidizer and manufacturing method thereof - Google Patents

Abstract

(A) selectively removing foreign matter contained in a waste aluminum can material; (b) heating the waste aluminum can material to burn carbonate the organic material or paint on the surface; (c) pulverizing the waste carbonized waste aluminum can material to produce an aluminum granule material; And (d) pressing the aluminum granule material to produce a disk-shaped deoxidizer. The present invention also relates to an aluminum deoxidizer prepared by the method.

Deoxidant, waste aluminum

Description

[0001] Aluminum deoxidizer and manufacturing method thereof [0002]

The present invention relates to an aluminum deoxidizer and a method for producing the same, and more particularly, to an aluminum deoxidizer molded into a high-density disc shape by pressing aluminum granules produced from a waste aluminum can for use as a deoxidizer for molten steel, .

Generally, the oxygen content in the molten steel is relatively high while the steel making process for removing the impurities in the pig iron is performed. This oxygen is adversely affected by the quality of the steel, so it must be removed through a deoxidation process. The deoxidation process is mainly carried out using Si, Mn, Al, Ca, Zr, Ti, Bo and rare earth elements which form thermodynamically stable oxides. .

Al is one of the strongest deoxidizers and is widely used in steelmaking. However, Al has a relatively low density compared to iron, and when it is put into the molten steel during the deoxidization process, it is not able to penetrate deeply and float . That is, when a deoxidizing agent is administered to molten steel, it is not easy for the deoxidizing agent to be injected into the molten steel through the steel material layer of the molten steel.

In view of such problems, Korean Patent Registration No. 0586403 discloses a composite deoxidizing agent containing iron particles.

According to this patent, there is provided a method of injecting a molten aluminum matrix into a continuously circulating mold, charging one or a plurality of cut reinforcing elements, and cooling to obtain a iron composite deoxidizer.

However, in the above method, since the waste aluminum material is melted by the dissolving method, a large amount of aluminum oxide loss is produced and the manufacturing cost is also high.

In addition, it is impossible to meter the aluminum base in a molten state, so that the mixing ratio of aluminum and iron pieces can not be precisely controlled, and the iron piece size is not uniform, making it difficult to produce a consistent quality deoxidizer.

Another conventional aluminum deoxidizer is obtained by burning selected waste aluminum can by burning, removing organic substances or paint adhering to the surface, and pulverizing to an appropriate size.

According to this method, since the aluminum is not melted, it is very advantageous from the viewpoint of energy. However, the deoxidizer obtained according to the above method has a so-called 'granule' shape as shown in FIG. 6, and has a relatively small specific gravity (0.7 g / cm 3 or less) because it contains many pores in the deoxidizer. Therefore, when it is put into the molten steel, the slag layer can not penetrate into the slag layer and react with oxygen while floating on the surface to generate a considerable amount of loss.

On the other hand, deoxidizers should be produced in large quantities and transported to steel mills. In this process, it is important to increase the weight per unit volume by reducing the volume as much as possible.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to improve the penetration performance to a molten metal by increasing the specific gravity of the deoxidizer by controlling the outer shape by compression while producing the aluminum deoxidizer by the combustion- An object of the present invention is to provide an aluminum deoxidizing agent capable of effective deoxidation and a method for producing the same.

In order to achieve the above object, a method of manufacturing an aluminum deoxidizer according to a preferred embodiment of the present invention comprises the steps of: (a) selectively removing foreign matter contained in a waste aluminum can material; (b) heating the waste aluminum can material to burn carbonate the organic material or paint on the surface; (c) pulverizing the waste carbonized waste aluminum can material to produce an aluminum granule material; And (d) pressing the aluminum granule material to produce a disk-shaped deoxidizer.

Wherein step (d) is carried out by a roll press comprising a pair of press rollers arranged so as to face the pressing face.

Preferably, the clearance D between the pressing surfaces of the pair of press rollers is set to be greater than 1 mm and less than 3 mm.

According to another aspect of the present invention, there is provided a disk-shaped aluminum deoxidizer produced by the above method, wherein the thickness of the aluminum deoxidizer is preferably in the range of 1 to 3 mm, more preferably the density of the aluminum deoxidizer is in the range of 1.2 to 2.0 g / Lt; / RTI >

According to the present invention, an aluminum deoxidizing agent is produced by burning carbonized waste aluminum can without reusing the waste aluminum can, so that the production cost is low and the production efficiency is also very high.

In addition, since the aluminum deoxidizer according to the present invention has a compressed disk shape, there is no void in the inside and relatively high density, so that the penetration effect is excellent when the aluminum deoxidizer is put into a molten metal.

This penetration effect of the present invention is further promoted by the needle-like structure appearing on the rim by pressing the granular material, and as a result, the deoxidation effect can be improved.

In addition, since the aluminum deoxidizer according to the present invention has a relatively higher specific gravity than conventional granules, more load can be loaded on the same volume, thereby reducing the logistics transportation ratio.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

The aluminum deoxidizer of the present invention is produced by recovering from a waste aluminum can. Generally, the waste aluminum can is recovered and supplied in the form of a pressurized body which is pressurized by a press to reduce its volume.

Figure 1 shows a schematic configuration of an apparatus for producing an aluminum deoxidizer according to a preferred embodiment of the present invention, and Figure 2 shows a method for producing an aluminum deoxidizer using such an apparatus.

Referring to the drawings, a method of manufacturing an aluminum deoxidizer according to the present invention will be described. First, the waste aluminum can pressurized body to be a raw material is disassembled from a disassembler 10 such as an impact breaker into a single- S100).

 The waste aluminum can material, which has been disassembled in the form of a cancake, is conveyed to the separator 20 by the conveying means, and foreign substances such as iron, glass, and plastic are selectively removed in the separator 20 (Step S110).

For example, an electromagnetic electromagnet may be provided in the sorter 20 to remove foreign substances containing iron components by magnetic force, and glass and plastic may be heated by using a specific gravity difference and a repulsive force (Eddy Current) Can be removed. It is to be understood that such a screening method is already known and thus a detailed description thereof is omitted, and that a variety of existing screening devices can be employed.

Then, the selected waste aluminum can material is transferred to the cutter 30 and cut to an appropriate size (step S120). Preferably, the waste aluminum can material is cut to a size of about 30 to 100 mm, but its size is not particularly limited. The purpose of cutting the waste aluminum can material in this way is to increase the area in contact with the hot gas in the combustion carbonization process to be described later.

The cut waste aluminum can material is charged into a rotary kiln (40) through a conveying means and heated to burn carbonaceous organic materials, paints, and the like attached to the surface of the waste aluminum can (Step S130). This combustion carbonization process may be performed by directly heating the rotary reactor 40 by a burner or by supplying a hot gas from the hot gas generator to the rotary reactor 40.

Preferably, the temperature inside the rotary reactor 40 is kept lower than the melting temperature of aluminum (660 ° C), more preferably about 300-600 ° C. If the temperature is lower than 300 ° C, the burning carbonization rate is slow and high production efficiency can not be expected. On the contrary, if the temperature is higher than 600 ° C, oxidation may be accelerated.

More preferably, the inside of the rotary reactor 40 is maintained in a carbon dioxide (CO ₂ ) atmosphere, or the oxidation of the aluminum material can be prevented by keeping the oxygen concentration at about 10% by volume or less.

The inner pressure of the rotary reactor 40 is maintained at about 5 mmHg or less, and it is preferable to rotate at a speed of about 5 to 8 rpm so as to properly process the waste aluminum can material. However, the process conditions as described above are not limited to the present invention, but may be arbitrarily changed according to various conditions such as specifications of a rotary reaction furnace and characteristics of a product to be produced.

The waste aluminum can material which has undergone the combustion carbonization process as described above is then introduced into the hammer mill 50 and crushed into a granule form having a proper particle size (step S140).

Specifically, when the waste aluminum can material is constantly struck by a hammer mill in a cylindrical screen having a plurality of holes of a predetermined diameter, the waste aluminum can material is crushed and aggregated into spherical granules, And is discharged to the lower portion at a smaller time point.

Preferably, the size of the discharged waste aluminum granules is about 5 to 30 mm, but is not necessarily limited to these values. In addition, in the pulverization process, the combustion residue and dust can be removed by various methods such as blowing by a fan, sieving by a sieve or centrifugal cyclone.

Since the above-described granule milling process is already known in the art, further detailed description will be omitted.

Further, in the present invention, the process of obtaining the aluminum granule material by treating the wasted aluminum can material has been described in detail. However, the present invention is not necessarily interpreted to be limited to these embodiments, It should be understood that an aluminum granule material can be obtained by processing the can material.

The aluminum granule material obtained in the above process contains many cavities in itself. Therefore, the pore size should be minimized through the subsequent pressing process, so that the penetration performance can be improved when it is introduced into the molten steel.

To this end, the aluminum granule material is transferred to the roll press 60 and pressed to a predetermined thickness (step S150).

Detailed configuration of the roll press 60 used in the present invention is shown in Figs. 3 to 5. Fig.

Referring to the drawings, a roll press 60 according to a preferred embodiment of the present invention includes a feed hopper 1 for storing and supplying an aluminum granule material, a pair of press rollers 11 and 12 for pressing an aluminum granule material (13) for uniformly feeding the aluminum granular material stored in the supply hopper (1) to the press rollers (11) (12).

The feed hopper 1 is provided with an aluminum material pulverized in a granular state in the hammer mill 50 and stored therein and a funnel-shaped outlet is provided in the lower part to supply the aluminum granule material to the quantitative feed means 13 .

A screw feeder (14) is provided at the outlet of the hopper (1) to continuously feed the aluminum granule material to the constant amount feeding means (13).

The screw feeder 14 includes a cylindrical feeding pipe 15 extending from an outlet of the hopper 1 to the fixed amount feeding means 13 and a feeding screw 16 rotating in the feeding pipe 15, . The feeding screw 16 is connected to the feeding motor 17 and rotates to feed the aluminum granule material to the quantitative feeding means 13.

The press rollers 11 and 12 are constituted by a pair of rollers disposed so as to face the pressing surfaces. The pressing surfaces of the press rollers 11 and 12 are formed flat to press the aluminum granule material.

According to the present invention, the pair of press rollers 11 and 12 are installed so that the clearance D between the pressing surfaces can be adjusted as shown in FIG. That is, the press roller 11 on one side is fixed on the support frame 19 coupled to the base 18 and the press roller 12 on the other side is movably installed on the support frame 19, The press rollers 12 of the press rollers 12 can be moved toward and away from each other. The other press roller 12 is connected to and supported by the hydraulic cylinder 21 and the clearance D between the pair of press rollers 11 and 12 is appropriately adjusted by the operation of the hydraulic cylinder 21. [ Lt; / RTI >

According to the present invention, the clearance D between the press rollers 11 and 12 is set to be greater than 1 mm and less than 3 mm, which determines the thickness of the granular material to be pressed.

The pair of press rollers 11 and 12 press the aluminum granular material while rotating in the direction of the arrow shown in FIG. A drive motor 22 for providing driving force for rotating the press rollers 11 and 12 and a gear box 23 for transmitting the rotational force of the drive motor 22 to the press rollers 11 and 12 ).

A plurality of gear trains may be arranged in the gear box 23 to transmit the rotational force of the drive motor 22 to the pair of output shafts 24 and 25. The rotational forces of the output shafts 24 and 25 Is transmitted to the pair of press rollers (11) (12) through the connecting rods (26) and (27).

However, it is to be understood that the configuration for rotating the pair of press rollers 11, 12 is not limited to the present embodiment, but may be constructed by employing various types of power transmitting means or clutch means.

According to the present invention, the upper portion of the pair of press rollers 11 and 12 is provided with a predetermined amount of aluminum granule material supplied from the supply hopper 1 uniformly between the press surfaces of the press rollers 11 and 12 A supply means 13 is provided.

Preferably, the quantity supplying means 13 is constituted by a vibrator installed between the pressing surfaces of the press rollers 11 and 12 from the end of the screw feeder 14. [ In the present specification and claims, 'uniformly supplying an aluminum granule material' means that aluminum granule materials are fed individually without being stacked in a stack. This is a natural constitution for squeezing each aluminum granule material.

To this end, the vibrator gradually feeds the aluminum granule material supplied from the supply hopper 1 with the vibration, so that the aluminum granule materials are scattered and injected at the positions where the pressing surfaces of the press rollers 11 and 12 are located.

Since the configuration of such a vibrator is already well known, various constructions can be applied and a detailed description thereof will be omitted.

3, reference numeral 31 denotes a feed hopper for guiding the aluminum granule material fed by the screw feeder 14 of the feed hopper 1 into the quantitative feed means 13 smoothly.

The operation of the roll press 60 having the above configuration will be described. First, the aluminum granule material stored in the supply hopper 1 is supplied to the quantitative supply means 13 by the screw feeder 14.

Then, the quantitative feeding means 13 separates the aluminum granular material by, for example, vibrating the aluminum granular material, thereby separating the aluminum granular material from the pair of the press rollers 11 (12 ). ≪ / RTI >

Then, the aluminum granule material is pressed on the pressing surfaces between the press rollers 11 and 12 rotated by the power of the drive motor 22, thereby finally completing the aluminum deoxidizer.

Preferably, the pressing force of the press rollers 11 and 12 is about 0.5 to 1.5 ton / cm 2, but is not limited thereto.

Finally, the extruded aluminum deoxidizer is withdrawn to the bottom and recovered or transported by a hopper or conveyor means not shown.

aluminum Deoxidant  Shape feature

Fig. 7 shows an external view of an aluminum deoxidizer prepared according to the method of the present invention. As can be seen from the above photograph, the aluminum deoxidizer of the present invention has a disk shape which is roughly thin and has a relatively sharp needle-shaped structure on the rim.

The above configuration is a unique feature obtained by pressing the aluminum granule material shown in Fig. When the aluminum granule material before squeezing is close to the sphere, the squeezed aluminum deoxidizer is also almost circular.

Further, since the aluminum granule material is irregularly crushed by being hit by the hammer mill, a sharp needle-shaped structure can be formed on the rim during pressing.

This needle-shaped structure was found to accelerate the destruction of the surface layer of the slag when the aluminum deoxidizer was added to the molten metal.

The thickness of the aluminum deoxidizer according to the present invention is set to be greater than 1 mm and less than 3 mm, which is determined by the clearance between the pair of press rollers 11 and 12 as described above.

When the thickness of the aluminum deoxidizer is less than 1 mm, the surface area is relatively larger than the weight, the formation of the needle-shaped structure is not active, or the molten steel is easily melted and disappears from the surface of the molten steel. .

On the other hand, when the thickness of the aluminum deoxidizer is thicker than 3 mm, the compression effect of the aluminum granular material is reduced, and there is still a minute pore inside the deoxidizer structure and the density of the deoxidizer is also low.

Preferably, the density of the aluminum deoxidizer prepared according to the present invention is in the range of about 1.2 to 2.0 g / cm 3, which is much higher than the density of conventional aluminum granules of about 0.7 g / cm 3.

Experimental Example

10 kg of a granular aluminum deoxidizer (FIG. 6) and an aluminum deoxidizer (FIG. 7) according to the present invention were charged into the reflection furnace, respectively, and the penetration performance of the molten metal was compared.

The molten aluminum melt is held in the reflection furnace, and the place where the deoxidizer is injected is stirred by the stirrer.

The deoxidizing agents were separately put into the molten aluminum, stirred for 30 seconds, stopped stirring, and visually observed the amount of the deoxidizer floating on the surface of the molten metal through the search window.

As a result, in the case of granular aluminum deoxidizer, the rate of floating on the surface without penetration into the molten metal was observed to be about 40 to 50%, and in the case of the aluminum deoxidizer according to the present invention, about 5 to 10% appear.

Since the granular aluminum deoxidizer has a small density and is generally spherical, it takes some time to penetrate and penetrate the slag layer on the surface of the molten metal even when stirring.

In addition, when the molten metal is put into the molten metal, the surface of the deoxidizing agent melts, trapping the voids existing in the deoxidizing agent, and the penetration of molten steel proceeds slowly. This phenomenon may have the adverse effect of blowing oxygen into the melt.

In the case of the aluminum deoxidizer according to the present invention, the synergistic effect was shown to be excellent. That is, the deoxidizer tends to penetrate into the molten steel in a vertical state with stirring, and the needle-shaped structure of the rim is considered to serve as a trigger for destroying the surface of the slag layer.

This characteristic of the present invention improves the deoxidizing effect of the slag for steelmaking and improves the recovery rate, or significantly reduces the oxidation loss caused by the material floating on the surface of the molten metal when molten aluminum is melted.

Although the present invention has been illustrated and described as a deoxidizer, it should be understood that the same can be applied to a raw material for aluminum melting.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view of an overall apparatus for producing an aluminum deoxidizer according to a preferred embodiment of the present invention.

2 is a flowchart showing a process of manufacturing an aluminum deoxidizer according to a preferred embodiment of the present invention.

FIGS. 3 to 5 are a front view, a plan view, and a partial side view showing the construction of a roll press for pressing an aluminum granular material in a method of manufacturing an aluminum deoxidizer according to a preferred embodiment of the present invention.

6 is a photograph showing a conventional granular aluminum deoxidizing agent.

7 is a photograph showing an aluminum deoxidizer according to a preferred embodiment of the present invention.

Claims (6)

(a) selectively removing foreign matters contained in the waste aluminum can material; (b) heating the waste aluminum can material to burn carbonate the organic material or paint on the surface; (c) pulverizing the waste carbonized waste aluminum can material to produce an aluminum granule material; And (d) pressing the aluminum granule material to produce a disk-shaped deoxidizer, Wherein the step (d) is carried out by a roll press including a pair of press rollers arranged so as to face the press face, Wherein a clearance (D) between the pressing surfaces of the pair of press rollers is set to be greater than 1 mm and less than 3 mm, and the thickness of the disk-shaped deoxidizer is greater than 1 mm and less than 3 mm. delete delete A disk-shaped aluminum deoxidizer produced by the method according to claim 1. delete 5. The method of claim 4, Wherein the aluminum deoxidizer has a density of 1.2 to 2.0 g / cm < 3 >.

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