JP2009297687A - Powdering method of aluminum can and powder manufacturing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply and inexpensively produce fuel powder suitable for thermit reaction from an empty aluminum can without being accompanied by the fear of ignition. <P>SOLUTION: This powdering method of the aluminum can is equipped with a process for crushing the aluminum can into plate fine pieces and a process for grinding the obtained plate fine pieces into a powdery form and characterized in that the friction heat producing part at least in the grinding process is cooled by a liquid nitrogen gas. This powder manufacturing apparatus of the aluminum can is equipped with a crusher for crushing the aluminum can into the plate fine pieces, a grinder for grinding the plate fine pieces obtained by the crusher into the powdery form and a nozzle for cooling the friction heat producing part at least in the grinder by the liquid nitrogen gas. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention mainly relates to a powdering method and powder production apparatus for an empty aluminum can after being used as a beverage container.

  Currently, aluminum cans that have been dumped indefinitely are collected by contractors, and aluminum manufacturers buy and collect them and melt them in a blast furnace, including a top plate made of iron and chrome, and divide them into aluminum, iron, and chrome according to the difference in deposition temperature. It is known that it is possible to make a fine aluminum powder through a process of high pressure spraying and cooling after melting and lump aluminum. On the other hand, when aluminum powder, iron oxide powder, and magnesium powder are mixed and burned, a high temperature of 2000 to 2700 ° C. is obtained by the thermite reaction, and medical waste such as syringes, mud containing arsenic generated during hot spring drilling, asbestos, etc. It is also known that detoxification can be made harmless. However, the method in which the aluminum lump is deposited in a blast furnace and then powdered cannot be avoided. An attempt was made to make aluminum powder directly from an aluminum can, but it failed to the present because the top plate of the can is a mixture of iron and chrome different from the main body.

On the other hand, there are many devices for crushing coarse products using a multi-axis roller, such as Japanese Patent Publication No. 2-5465, Japanese Patent Publication No. 1-27788 which is the basis thereof, and further developed US Pat. No. 7,128,285. It is impossible to make a powder of 1 mm or less suitable for the thermite reaction. A three-force universal crusher in which a number of rotating blades slightly shifted in the circumferential direction are stacked and held to form a high-speed rotating shaft, and a plurality of fixed blades that surround the high-speed shaft and project opposite the rotating blade are provided in the housing. The machine is also available from Sanriki Manufacturing Co., Ltd. However, the pulverizer cannot produce a powder of a uniform size that can be used for the thermite reaction.
Japanese Patent Publication No.2-5465 Japanese Patent Publication No. 1-27778 U.S. Pat. No. 7,128,285 Catalog of Sanroku Universal Crusher manufactured by Sanriki Manufacturing Co., Ltd.

  An object of the present invention is to make it possible to generate a fuel powder (powder) suitable for a thermite reaction from an empty aluminum can at a low cost and without fear of ignition.

  The invention of claim 1 includes a step of crushing an aluminum can into plate-like strips, and a step of crushing the obtained plate-like crush pieces into powder, and at least the frictional heat generating portion in the crushing step is liquid nitrogen gas. This is a method for pulverizing an aluminum can characterized by cooling at

  The invention of claim 2 includes a crusher for crushing an aluminum can into plate-like pieces, a crusher for crushing plate-like pieces obtained with the crusher into a powder form, and at least a frictional heat generating portion in the crusher. An aluminum can powder manufacturing apparatus comprising a nozzle for cooling with liquid nitrogen gas.

  In claim 3, the crusher is a triaxial crusher.

  According to a fourth aspect of the present invention, there is provided a high-speed rotary shaft in which a plurality of rotary blades that are slightly shifted in the circumferential direction by a pulverizer are stacked and held, and a housing having a fixed blade that surrounds the rotary shaft and protrudes opposite the rotary blade. A single-screw crusher provided.

  According to a fifth aspect of the present invention, a screen is provided on the housing so as to face the rotating lower surface of the rotary blade group.

  According to a sixth aspect of the present invention, there is provided an air transporter that sucks the powder obtained by the pulverizer through a screen and supplies the powder to the separator.

  According to a seventh aspect of the present invention, a clogging prevention nozzle for ejecting dry gas upward is provided below the screen.

  According to another aspect of the present invention, there is provided a drive mechanism for reciprocating the clogging prevention nozzle below the screen.

  In the ninth aspect, the liquid nitrogen gas nozzle is provided within the thickness of the fixed blade.

  According to the first and second aspects of the invention, an exquisite combination of a crusher and a pulverizer can safely and inexpensively produce a powder of about 1 mm or less suitable for the thermite reaction (eliminating the risk of ignition). Become.

  According to the third and fourth aspects of the invention, it is possible to effectively carry out rough crushing and crushing to obtain powder.

  According to the fifth to eighth aspects, there is an advantage that uniform size aluminum powder can be obtained automatically.

  According to the ninth aspect, the amount of liquid nitrogen used can be minimized and the cooling efficiency can be kept high.

  In FIG. 1 showing the front, an example of a powder production apparatus G in which a uniaxial crusher 2 is integrally assembled on the lower side of the triaxial crusher 1 is shown. 5 is a hydraulic motor, 6 and 7 are transport pipes, 8 is a suction pump, 9 is a vibration type separator, 10 is a container for containing the finished product ready for use in the thermite reaction, 11 is It is a trolley. Also, 12 is a return pipe for an oversized semi-finished product, and 68 is a product outlet.

  2 has two upper screws 14, 15 (driven in the directions of arrows A and B, for example, 5 to 60 rpm) and one The lower screw 16 (for example, the reverse screw is freely driven in the direction of the arrow C at the same speed as the upper screws 14 and 15), and knives 18 and 19 (including a liquid nitrogen gas supply nozzle 20 in the housing 17). A pair of discharge amounts that are energized so as to approach each other by a spring 23 and adjust the opening degree of the discharge port 24 by a signal from a detector (not shown). A roller 25 is provided. Reference numeral 26 denotes a crushed material, that is, an aluminum can.

  In FIG. 3, which is a view taken along the line III-III in FIG. 2, the crushed material 26 is driven in the directions of the arrows D and E facing each other by the twisting direction and the rotational directions A and B of the blades 30 and 31 of the upper screws 14 and 15 Sheared by the blades 30 and 31 into the mesh 32 (formed by the intersecting blades) of the lower screw 16 and the portion protruding from there is a knife 18 or 19 (which knife operates depends on the lower screw) Is determined by the direction of rotation of 16) and falls downward.

  In the lower half of FIG. 2 again, the single-screw crusher 2 has a thin rotary blade 36 (thickness is preferably 1 to 5 mm, more preferably 1 to 2 mm) on a high-speed rotary shaft 35 (for example, 1500 rpm). A large number of cutters are shifted and held slightly in the rotational direction (for example, 15 degrees), and fixed blades 37 to 40 that surround these rotary blade groups and project toward the rotary blade 36 extend in a direction perpendicular to the paper surface. It is fixed to the housing 41 in a posture. Each fixed blade is provided with a large number of small diameter nozzles 42 adjacent to each other in the longitudinal direction of the fixed blade, and these nozzles communicate with the pipe 21. A screen 45 covers the lower side of the rotary blade 36 group, and is formed of, for example, a fine mesh of stainless steel (opening degree: about 1 mm). The powder sucked downward through the mesh enters the transport pipe 6. A tubular body having a nozzle 48 for preventing clogging that blows dry air or liquid nitrogen gas upwards and extends vertically in the direction perpendicular to the plane of FIG. The drive mechanism 49 is configured to be reciprocally driven (for example, one reciprocation per minute) along the guide 46 in the direction of arrow F and reverse F by a loop belt (not shown).

  In FIG. 4, a triaxial crusher 1 and two uniaxial crushers 2 (only the front one is shown) are separately arranged, and both are connected by a bucket conveyor 52.

  FIG. 5 shows a liquid nitrogen gas fire extinguisher 54, 55 is a liquid nitrogen tank, 56 is a solenoid valve, and 57 is a pump.

  FIG. 6 shows the separator 9. The screens 60 to 62, which are made finer as they go downward, are supported by an elastic film on the outer periphery of the housing 63 and are driven in the front-rear and left-right directions by the vibration motor 64. The discharge ports 65 to 67 are returned to the crusher 2 or the crusher 1 again by the return pipe 12 shown in FIG. 1, and the discharge port 68 communicates with the product container 10 shown in FIG.

  The liquid nitrogen gas may be supplied from a nozzle provided on the inner surface of the housing 41. The crusher 1 and the crusher 2 may have structures other than those shown in the drawings, but it is preferable that the crusher is roughly crushed so as not to leave at least an aluminum can shape.

It is a front view of an apparatus. It is the II-II cross-sectional enlarged view of FIG. It is the III-III arrow line view of FIG. It is a front view which shows another Example. It is a piping diagram of a liquid nitrogen fire extinguishing apparatus. It is a partial longitudinal section front view of a separator.

Explanation of symbols

1 3-axis crusher 2 1-axis crusher 6, 7 Transport pipe (air transporter)
DESCRIPTION OF SYMBOLS 8 Suction pump 9 Sorting machine 20, 42 Liquid nitrogen gas nozzle 36 Rotary blade 37-40 Fixed blade 41 Housing 48 Clogging prevention nozzle 49 Drive mechanism

Claims (9)

  It comprises a step of crushing an aluminum can into plate-like pieces and a step of crushing the obtained plate-like crush pieces into a powder, and at least the frictional heat generating part in the crushing step is cooled with liquid nitrogen gas A method for powdering aluminum cans.   A crusher that crushes aluminum cans into plate-like pieces, a crusher that crushes plate-like pieces obtained by the crusher into powder, and at least the frictional heat generation part of the crusher is cooled by liquid nitrogen gas An aluminum can powder manufacturing apparatus comprising a nozzle.   The aluminum can powder production apparatus according to claim 2, wherein the crusher is a triaxial crusher.   A uniaxial crusher comprising a high-speed rotary shaft that holds a large number of rotary blades that are slightly shifted in the circumferential direction by a crusher, and a housing that surrounds the rotary shaft and has a fixed blade that protrudes opposite the rotary blades. The aluminum can powder production apparatus according to claim 2, wherein the apparatus is a machine.   The aluminum can powder manufacturing apparatus according to claim 4, further comprising a screen provided on the housing so as to face the rotating lower surface of the rotary blade group.   The aluminum can powder manufacturing apparatus according to claim 5, further comprising an air transporter that sucks the powder obtained by the pulverizer through a screen and supplies the powder to the sorting machine.   6. The aluminum can powder producing apparatus according to claim 5, wherein a nozzle for preventing clogging is provided below the screen to eject dry gas upward.   The powder production apparatus for an aluminum can according to claim 7, further comprising a drive mechanism for reciprocally moving the clogging prevention nozzle below the screen.   The apparatus for producing powder of an aluminum can according to claim 4, wherein the liquid nitrogen gas nozzle is provided within the thickness of the fixed blade.

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