JPH1130414A - Continuous recovery furnace for unburnt non-ferrous metal in shredder dust - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device to dispose shredder dust, generated when a scrap vehicle is crushed, at a low cost with safety. SOLUTION: A rotary furnace 1 formed in a cylindrical shape is disposed in a state to incline at a given angle. Shredder dust is charged through a shredder dust charge port 2a formed in one end part 6 of a rotary furnace 1, combustion residue of shredder dust is outputted through an output port 25 of the other end part 7, and combustion gas is outputted through a discharge port 18. In a so formed rotary furnace, a plurality of agitasting plates 3. Shredder dust in the rotary furnace 1 in agitated by the agitating plates 13, a disc-form plate body is fixed in the vicinity of an inner end part 6 of the rotary furnace 1 in a manner to close the central part of the rotary furnace 1, and the shredder dust is continuously burnt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a rotary kiln suitable for treating shredder dust by continuously burning a large amount of shredder dust when crushing and disposing of an old automobile. .

[0002]

2. Description of the Related Art Conventionally, an old scrap car is disposed of by a crusher 30, crushed, passed through a dust collector 31, and then separated by a separation device 32, as shown in the block diagram of FIG. Iron scrap 33, non-ferrous metal scrap (aluminum,
Copper, zinc) 34, wiring waste 35 such as rubber, glass waste 3
6, after classifying into materials such as shredder dust 37 made of polyurethane etc. for cushion of seats of seats,
In addition to recycling each waste to make it reusable, unusable shredder dust and the like are discarded as industrial waste.

However, when shredder dust is discarded as described above, since the shredder dust is bulky, it is necessary to temporarily store a large space before transporting the shredder dust to a dumping site, and it is also costly to transport the shredder dust. In particular, since shredder dust discharged from dust collectors contains fine non-ferrous metals, landfilling as stable waste has recently been prohibited, and it must be disposed of as managed waste. For this reason, disposal costs are extremely high, and there is a demand for inexpensive, safe, and prompt disposal.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above points, and has as its object to continuously separate non-ferrous metals in shredder dust by burning. An object of the present invention is to provide an unburned non-ferrous metal continuous recovery furnace suitable for the processing of shredder dust which is inexpensively, quickly and safely processed. .

[0005]

Means for Solving the Problems In order to achieve the above object, a continuous furnace for recovering unburned non-ferrous metal in shredder dust according to the present invention is provided by disposing a rotary furnace formed in a cylindrical shape at a predetermined angle, Shredder dust is injected from a shredder dust input port formed at one end of the rotary furnace and the shredder dust is burned in the rotary furnace,
A rotary furnace having an outlet through which unburned non-ferrous metal in the shredder dust is taken out from an outlet at the other end and a combustion gas is taken out, and a plurality of agitating plates project into the rotary furnace. The stirring plate is used to stir the shredder dust in the rotary furnace, and a disk-like shape is formed near the one end of the rotary furnace so as to cover the center of the rotary furnace. Characterized in that the plate is fixed so that the shredder dust is continuously burned. Further, the plurality of stirring plates form a stir plate row in which a predetermined number of stir plates are spirally mounted, and the number of stir plate rows is large at the input port side and small at the discharge port side. It is characterized by having been done. At the end of the rotary furnace on the outlet side, an extended portion for storing unburned non-ferrous metal is provided, and a circular outlet surrounded by the extended portion is formed. The slag and the combustion gas are exhausted through the slag. Further, on the side surface near the outlet of the rotary furnace, an outlet for molten metal is provided, and when the rotary furnace is rotated and the outlet comes down, the inside of the rotary furnace is removed from the outlet. The molten metal or unburned non-ferrous metal in the molten shredder dust is taken out.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a continuous recovery furnace for processing shredder dust according to the present invention will be described with reference to FIGS. The shredder dust referred to in the present invention is a material having a completely different specific gravity, specifically, metal, glass, rubber, and the like.
A mixture of plastics, fibers, etc.

First, the outline of the present invention will be described with reference to the process chart of FIG. 1 and FIG. 2. The charging furnace provided at one end of a rotary kiln (hereinafter referred to as a rotary kiln) 1 arranged at a predetermined angle. The shredder dust in the popper 2 is injected into the opening 2a, and the shredder dust injected into the rotary kiln 1 is ignited by an ignition burner to burn the shredder dust.

The shredder dust is transported while burning inside the rotary kiln 1 in the direction of arrow A in FIG. 2 while being protruded into the rotary kiln 1 as shown in FIG. 3 and being stirred by a plurality of spirally provided stirring plates 13. Ash and other ash are taken out from the outlet 18 at the other end of the rotary kiln 1, and unburned non-ferrous metal melted in the rotary kiln 1 is also taken out from an outlet 25 formed on the side surface of the rotary kiln 1. Has become.

[0010] The combustion gas generated when the shredder dust is burned in the rotary kiln 1 is discharged to an outlet 18.
, And is completely burned in the secondary combustion furnace 3, rendered harmless via the stocker 4 and the exhaust gas treatment device 5, and released to the atmosphere.

Next, the present invention will be described in detail with reference to FIGS. The rotary kiln 1 is a cylindrical rotary furnace with a hollow inside. The rotary kiln 1 has an end 6 on the side of the inlet into which the shredder dust is injected, slightly above the end 7 on the side of the discharge port 18 of the slag. Are arranged at a predetermined angle so as to be arranged at a predetermined angle. The end 6 of the rotary kiln 1 is closed by a circular fire-resistant wall 8, and an ignition burner 9 for igniting shredder dust is provided substantially in the center of the fire-resistant wall 8.

As shown in FIG. 3, the rotary kiln 1 is covered on its outer side with an outer plate 10, and the outer plate 10
A stir plate 13 made of heat-resistant cast steel is fixed in the rotary kiln 1 with bolts 14 so as to hold down the refractory 11.

Therefore, the stirring plate 13 has a role to stir the shredder dust put in the rotary kiln 1 in accordance with the rotation of the rotary kiln 1 and to fix the refractory 11 in the rotary kiln 1. The tip portion 33 of the stirring plate 13 is bent in a substantially U-shape in the rotation direction to ensure stirring.

An extension 16 having an L-shaped cross section is provided at the other end 7 of the rotary kiln 1 for storing the shredder dust generated in the rotary kiln 1 and the molten unburned non-ferrous metal 17. Can be done. A circular fuel discharge port 18 is formed in a portion surrounded by the extending portion 16 having an L-shaped cross section.

Therefore, when the amount of the input shredder dust becomes large and the slag exceeds the extending portion 16, the slag burned in the rotary kiln 1 is discharged from the discharge port 18 to the oscillating roaster 20. The slag discharged to the oscillating roaster 20 is configured to be carried out by the conveyor 21.

Further, two or three outlets 25 for taking out molten non-ferrous metal are provided at equal intervals on the side surface near the end portion 7 and near the extending portion 16 of the rotary kiln 1 so that the rotary kiln 1 rotates. When the outlet 25 reaches the lower side, the lid 26 is opened, and the molten non-ferrous metal in the rotary kiln 1 falls from the outlet 25 and can be taken out of the rotary kiln 1.

The stirring plate 13 is provided in the rotary kiln 1 in a substantially spiral shape. In the present invention, the stirring plates 13 are not spirally provided at predetermined intervals in the rotary kiln 1, but are formed with a predetermined number of stirring plates 13 a at a predetermined interval. Thereafter, a portion where no stirring plate is attached is provided, and further, a plurality of stirring plate rows 13a including a plurality of stirring plates are discontinuously arranged in a substantially spiral shape so as to provide the above-described stirring plate row 13a, and a plurality of sets are formed. doing. In addition, no stirring plate is provided in the vicinity of the outlet 18 so as not to stir the slag. Further, the number of the stirring plates near the inlet 2a is small, and the number of the stirring plates in the central portion is large. Therefore, the stirring of the shredder dust proceeds in the rotary kiln 1 while being agitated more particularly in the central portion of the rotary kiln 1.

FIG. 4 is a view showing the vicinity of the discharge port 18 of the rotary kiln 1. A baffle plate 28, which is a disk-shaped plate, is provided at a position substantially equal to the diameter of the rotary kiln 1 from the end of the rotary kiln 1. . The baffle plate 28 is provided so as to close a substantially central portion of the rotary kiln 1, whereby the flow of air in the rotary kiln 1 is favorably maintained, and combustion in the rotary kiln 1 is ensured. The position of the baffle plate 28 is not limited to the above, but may be appropriately selected.

In the rotary kiln 1 configured as described above, the shredder dust in the hopper 2 is injected through the inlet 2a provided through the fire-resistant wall 8. The inside of the rotary kiln 1 is already 800 to 10 by the ignition burner 9.
Because of the high temperature of 00 ° C., the shredder dust starts burning immediately. Then, as the rotary kiln 1 rotates, the shredder dust burning by the stirring plate 13 is stirred in the rotary kiln 1. Further, since the rotary kiln 1 is inclined at a predetermined angle such that the discharge port 18 is on the lower side, the shredder dust is gradually carried in the direction of arrow A while being stirred.

The burnt ash or the like is accumulated in a portion surrounded by the extending portion 16 and the side surface of the rotary kiln 1, and the collected burnt is discharged from the discharge port 18 to the oscillating roaster 20. Unburned non-ferrous metal in the shredder dust is taken out from the outlet 25.

[0021] Also, and carbon dioxide gas produced in the rotary kiln within 1, NO _X gas containing nitrogen oxides, SO _x gas containing sulfur oxides, and hydrogen chloride gas, harmful substances to the human body such as dioxin The combustion gas containing is
Is sent to the secondary combustion furnace 3 through the furnace, where it is completely burned at about 1200 ° C. to be harmless.
Is completely harmless and is released to the atmosphere.

In the experiment, the calorie burned in the rotary kiln 1 was 5000 Kcal / Kg, which was approximately 15 Kcal / Kg.
When it was burned in about 20 minutes, the shredder dust could be burned most efficiently.

[0023]

According to the present invention, since the unburned non-ferrous metal continuous recovery furnace for shredder dust treatment according to the present invention is constructed as described above, the following effects can be obtained. (1) The stirring plate burns the shredder dust inside the rotary kiln while stirring it, eliminating the temperature gradient inside the furnace, making the furnace temperature almost uniform and increasing the residence time of the shredder dust inside the furnace, resulting in complete combustion. Can be done.

(2) Since the baffle plate is provided in the rotary kiln, the shredder dust can be burned more completely and the processing can be performed in a short time.

(3) By installing the apparatus of the present invention in a processing plant, the transport of shredder dust becomes unnecessary, and fine non-ferrous metals in shredder dust are separated and recovered by only burning, so that the cost is reduced. Can be processed.

[Brief description of the drawings]

FIG. 1 is a process diagram of a shredder dust treatment of the present invention.

FIG. 2 is a sectional view of a main part of the rotary kiln of the present invention.

FIG. 3 is a cross-sectional view showing attachment of a stirring plate.

FIG. 4 is a diagram showing a baffle plate provided in a rotary kiln.

FIG. 5 is a diagram showing the background of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary furnace (rotary kiln) 2 Hopper 3 Secondary combustion furnace 6, 7 End part 8 Refractory wall 9 Ignition burner 10 Outer plate 11 Refractory 13 Stirring plate 16 Extension part 18 Discharge port 20 Swing rostor 25 Outlet 28 Baffle plate

Claims (4)

[Claims] 1. A rotary furnace formed in a cylindrical shape is disposed at a predetermined angle, and shredder dust is injected from a shredder dust inlet formed at one end of the rotary furnace. Burn shredder dust,
A rotary furnace having an outlet through which unburned non-ferrous metal in the shredder dust is taken out from an outlet at the other end and a combustion gas is taken out, and a plurality of agitating plates project into the rotary furnace. The stirring plate is used to stir the shredder dust in the rotary furnace, and a disk-like shape is formed near the one end of the rotary furnace so as to cover the center of the rotary furnace. A continuous recovery furnace for unburned non-ferrous metals in shredder dust, characterized in that the plate is fixed so as to continuously burn the shredder dust. 2. The plurality of stirring plates form a stir plate row in which a predetermined number of stir plates are spirally mounted, and the number of stir plate rows is large on the input port side and high on the discharge port side. 2. The furnace for continuously recovering unburned non-ferrous metals in shredder dust according to claim 1, wherein a small amount of non-ferrous metal is fixed. 3. An extended portion for storing unburned non-ferrous metal is provided at an end of the rotary furnace on the exhaust port side, and a circular exhaust port surrounded by the extended portion is formed. The unburned non-ferrous metal continuous recovery furnace for shredder dust according to claim 1 or 2, wherein the slag and the combustion gas are discharged through the discharge port. 4. An outlet for molten metal is provided on a side surface near an outlet of the rotary furnace, and when the rotary furnace rotates and the outlet comes down, the outlet is rotated from the outlet. 4. The furnace for continuously recovering unburned non-ferrous metal in shredder dust according to claim 1, wherein the molten metal or unburned non-ferrous metal in the shredder dust melted in the furnace is taken out.