KR101225856B1 - Grinding method of Aluminum can and apparatus thereof - Google Patents

Abstract

And a step of crushing the aluminum can into small pieces of plate shape and a step of crushing the obtained plate-shaped pieces into powder form, wherein at least the frictional heat generating portion in the crushing step is cooled by liquid nitrogen gas. Method of powdering cans. According to this method, a fuel powder (powder) suitable for the thermite reaction can be easily produced from an empty aluminum can without involving the risk of ignition.

Description

Powdered method of aluminum can and apparatus for producing powder

TECHNICAL FIELD This invention relates to the powdering method of an empty aluminum can, and a powder manufacturing apparatus mainly after being used as a beverage container.

At present, aluminum cans that are dumped indefinitely are collected by a supplier. The collected aluminum cans are collected and processed by an aluminum maker. An aluminum maker melts an aluminum can in a blast furnace with a top plate made of iron or chromium, divides aluminum, iron and chromium out according to the difference in precipitation temperature, dissolves the agglomerated aluminum, Through the process and the cooling process, fine aluminum powder can be produced. This is well known. In addition, when aluminum powder, iron oxide powder, and magnesium powder are mixed and burned, a high temperature of 2000 to 2700 ° C. is obtained by a thermite reaction, whereby medical waste such as a syringe and arsenic generated during hot spring excavation are included. Mud, asbestos, etc. can be incinerated and harmless. This is also known. However, in the method of powdering after depositing aluminum ingots in a blast furnace, the irrationality that it becomes extremely expensive cannot be avoided. Therefore, attempts have been made to make aluminum powder directly from aluminum cans, but all of these attempts fail, for example, because the top plate of the aluminum can is made of a mixture of iron and chromium different from the aluminum can body.

On the other hand, as an apparatus for crushing bulky articles using multi-axis rollers, Japanese Patent Application No. 2-5465, Japanese Patent Application No. 1-27778, which is the basis of the above, and the United States, which further developed it. Although there exist many, such as patent 7128285, in these apparatus, it is impossible to obtain the powder below 1 mm suitable for the thermite reaction. In addition, it has a high speed rotary shaft which has a plurality of rotary blades slightly held in the circumferential direction, and a housing having a plurality of fixed blades enclosing the high rotary shaft and protruding against the rotary blade. A universal pulverizer is sold at Japan Ryogoku Kogyo Co., Ltd. However, the pulverizer cannot obtain a powder of a uniform size that can be used for the thermite reaction, and there is a risk of ignition if the powder is tried in a group.

Patent Document 1: Japanese Patent Application Laid-Open No. 2-5465

Patent Document 2: Japanese Patent Application Laid-Open No. 1-27778

Patent Document 3: US Patent No. 7128285

[Non-Patent Document 1] Catalog of Miruku-type Universal Grinding Machines

It is an object of the present invention to produce a fuel powder (powder) suitable for the thermite reaction from a blank aluminum can, which can be produced simply and inexpensively, without involving the risk of ignition.

The preferable aspect of this invention has the following structures.
[1] a step of crushing the aluminum can into small pieces of plate shape and a step of crushing the obtained plate-shaped pieces into powder form, wherein at least the frictional heat generating portion in the crushing step is cooled by liquid nitrogen gas. , Powdering method of aluminum can.

[2] a crusher for crushing the aluminum can into small pieces of plate, a pulverizer for crushing the plate-shaped pieces obtained in the crusher into a powder form, and a nozzle for cooling at least the frictional heat generating portion of the pulverizer with liquid nitrogen gas; It is a powder manufacturing apparatus of the aluminum can characterized by the fact.

[3] A crusher is a triaxial crusher.

[4] A pulverizer is a single-axis pulverizer having a housing having a high-speed rotary shaft which has a plurality of rotary blades stacked slightly in the circumferential direction, and a housing which surrounds the rotary shaft and protrudes against the rotary blade. .

[5] A screen provided in the housing is provided to face the lower surface of the rotary blade group.

[6] An air transport device is provided for sucking powder obtained through a pulverizer through a screen and feeding the powder to a separator.

[7] A clogging prevention nozzle is provided at the bottom of the screen to blow dry gas upward.

[8] A driving mechanism for reciprocating the clogging prevention nozzle is provided below the screen.

[9] A liquid nitrogen gas nipple is provided in the thickness portion of the fixed blade.

According to the invention described in [1] and [2], by the exquisite combination of the crusher and the pulverizer, a powder of about 1 mm or less suitable for the thermite reaction can be safely and inexpensively produced (without the risk of ignition). .

According to the invention as described in [3] and [4], grinding to obtain coarse crushing and powder can be effectively performed.

According to the invention as described in [5] to [8], there exists an advantage that the aluminum powder of uniform size can be obtained automatically.

According to the invention described in [9], the amount of liquid nitrogen used can be minimized, and the cooling efficiency can be maintained high.

1 is a view showing the front of the apparatus according to the present invention, in which one example of a powder manufacturing apparatus G in which a single-axis mill 2 is integrally assembled below the three-axis shredder 1 is shown, see FIG. 3 is an auto-inserting device for aluminum cans, 4 and 5 are hydraulic motors, 6 and 7 are transport pipes, 8 are suction pumps, 9 are vibratory separators, and 10 are ready to be used for thermite reactions. Container for accommodating water, 11 being a bogie. 12 is a return pipe for oversized semifinished products, and 68 is a product outlet.

The triaxial shredder 1 (applicant's product MARIN) of FIG. 2 includes two upper screws (1 4, 15; driven at, for example, 5 to 60 rpm in the directions of arrows A and B), and one lower screw 16; For example, inverted and freely driven in the direction of arrow C at the same speed as the upper screws 14 and 15, and the knifes 18 and 1 mounted on the housing 17; among them, a liquid nitrogen gas supply nozzle 20 is provided. , Which is connected to the pipe 21 and pushed to approach each other by the spring 23, and adjusts the opening degree of the discharge port 24 by a signal from a detector (not shown). The adjusting roller 25 is provided. Reference numeral 26 denotes a shred, ie an aluminum can.

In FIG. 3, which is viewed from the direction of the III-III arrow of FIG. 2, the crushed object 26 is opposed by the torsional directions of the blades 30 and 31 of the upper screws 14 and 15 and the rotational directions A and B. Driven in the D and E directions, sheared by the blades 30 and 31 to enter the space 32 (formed by the intersecting blades) of the lower screw 16 and emerge therefrom. The part is sheared by the knife 18 or 19 (which knife is determined by the rotational direction of the lower screw 16), and falls downward.

Again in the lower half of Fig. 2, in the single-axis mill 2, on the high-speed rotary shaft 35 (e.g., 1500 rpm), the thin rotary blade 36 (the thickness is preferably 1 to 5 mm, more preferably 1 to 2 mm). Cutter) is set aside in a direction of rotation little by little (for example, 15 degrees), and a plurality of them are stacked and held, and the fixed blades 37 to 40 which surround these groups of rotary blades and protrude toward the rotary blades 36 are grounded. It is fixed to the housing 41 in the posture extended at right angles to the housing 41. On each stationary blade, a large number of small diameter nozzles 42 are provided adjacent to each other in the longitudinal direction of the stationary blade, and these nozzles communicate with the pipe 21. Reference numeral 45 denotes a screen covering the lower part of the rotary blade 36 group, which is formed of, for example, a thin mesh (about 1 mm of opening degree) of stainless steel wire. The powder sucked downward through this mesh enters the transport pipe 6. At the bottom of the screen 45, a tubular body with a clogging nozzle 48 secretly ejecting dry air or liquid nitrogen gas upwards extends in a direction perpendicular to the ground of FIG. And the tubular body is reciprocally driven (for example, reciprocating once per minute) in the direction of arrow F and inverse F along the guide 46 by the drive mechanism 49 and a loop belt not shown. Consists of. Note 35 'is a comminuted product.

In FIG. 4, the triaxial crusher 1 and the two monoaxial crushers 2 (only the former one is shown) are arrange | positioned separately, and both are connected by the bucket conveyor 52. As shown in FIG.

FIG. 5 shows a liquid nitrogen gas extinguishing device 54, where 55 is a liquid nitrogen tank, 56 is a solenoid valve, and 57 is a pump.

6 shows the fractionator 9. In this separator 9, the screens 60 to 62, which are tapered as they are moved downward, are supported by an outer membrane elastic membrane with respect to the housing 63, and are moved in the front, rear, left and right directions by the vibration motor 64. It is installed to drive. The discharge ports 65 to 67 are returned to the grinder 2 or the crusher 1 again by the return pipe 12 of FIG. The discharge port 68 communicates with the product container 10 of FIG. 1.

The liquid nitrogen gas may be supplied from a nozzle provided on the inner surface of the housing 41. Although the shredder 1 and the grinder 2 can also employ | adopt the thing of the structure other than what was shown in figure, it is preferable to grind | crush the grinder roughly so that it may not leave the can shape of an aluminum can at least.

1 is a front view of the apparatus of the present invention.

FIG. 2 is an enlarged cross-sectional view of II-II in FIG. 1.

FIG. 3 is a view seen from the arrow direction III-III of FIG.

4 is a front view showing another embodiment.

5 is a piping diagram of a liquid nitrogen extinguishing device.

6 is a partial transverse front view of the fractionator.

(Explanation of Symbols)

1---3-axis shredder

2---Single Axis Grinder

6, 7---Pipes for transport (air transporters)

8---Suction Pump

9---Classifier

20, 42---Liquid nitrogen gas supply nozzle

36---Rotary Blade

37 ~ 40---Fixed blade

41---Housing

48---Blocking nozzle

49---Drive Mechanism

Claims (9)

delete 3-axis shredder to break the aluminum can into small pieces on the plate, It is integrally assembled under the triaxial crusher, and is provided with the uniaxial crusher which grinds the plate-like small pieces obtained by the triaxial crusher into powder form, The triaxial shredder is equipped with two upper screws, one lower screw and a knife, and is further sheared by the lower screw and the knife after shearing the aluminum can with the upper screw, The single-axis grinder has a rotary shaft which has a plurality of rotary blades stacked in the circumferential direction little by little, and a fixed blade projecting toward the rotary blade around the rotary shaft. The triaxial crusher has a knife equipped with a liquid nitrogen gas supply nozzle at the tip, whereby the frictional heat generating portion is cooled by the liquid nitrogen gas, The single-axis grinder has an adjacent nozzle for ejecting liquid nitrogen gas toward the rotary blade by the fixed blade, whereby the frictional heat generating portion is cooled by the liquid nitrogen gas. Powder manufacturing equipment. delete delete The powder manufacturing apparatus of the aluminum can of Claim 2 characterized by the screen being provided so that a uniaxial grinder may face the rotating lower surface of a rotary blade. The powder manufacturing apparatus of the aluminum can according to claim 5, wherein the powder obtained by the single screw mill is sucked through a screen and fed to a separator. The clogging prevention nozzle which ejects a dry gas upwards is provided in the lower part of the screen, The powder manufacturing apparatus of the aluminum can of Claim 5 characterized by the above-mentioned. The powder manufacturing apparatus of the aluminum can of Claim 7 provided with the drive mechanism which reciprocates a clogging nozzle from the lower side of a screen. delete

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