JP3430892B2 - Method and apparatus for recovering metal in pyrolysis residue - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for recovering metal in a pyrolysis residue obtained by heat-treating shredder dust and the like from waste such as waste automobiles and waste home electric appliances.

[0002]

2. Description of the Related Art When disposing of automobiles, home appliances, etc.,
Interior parts and the like are removed from other parts and crushed to form so-called shredder dust. This shredder dust is usually volume-reduced by heat treatment to be a so-called pyrolysis residue and then disposed of. This thermal decomposition residue is usually C derived from an electric component or the like, such as a copper wire.
metal particles made of a metal such as u, Fe, Pb, and Zn;
It is a mixture with particles having a relatively low specific gravity, such as carbides derived from synthetic resins. As a specific example of this thermal decomposition residue, Cu is 3 to 15% by weight, and Fe is 3 to 20%.
% By weight, 1 to 7% by weight of other metals, 30 to 30% of carbides
70% by weight, including 10 to 30% by weight of other non-metals,
The thing with the average particle diameter of 0.1 mm-10 cm can be mentioned.

[0003]

As described above, the thermal decomposition residue contains Cu, Fe, P derived from electric parts and the like.
In many cases, valuable metals such as b and Zn are contained, but a technique for recovering this metal has not been established so far, and a technique for efficiently recovering the metal in the thermal decomposition residue is desired. It had been. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method and an apparatus capable of efficiently recovering a metal in a thermal decomposition residue.

[0004]

The above object is a method of recovering metal particles in a thermal decomposition residue containing metal particles and low specific gravity particles made of a substance having a lower specific gravity than the metal particles by using an inclined plate, As the inclined plate, the one on the upper surface of which the sorting groove for retaining the metal particles in the thermal decomposition residue on the inclined plate is formed along the direction intersecting the inclination direction, the thermal decomposition residue is separated from the sorting groove on the inclined plate. The slant plate is fed along the groove direction of the sorting groove while being supplied to the upper side in the slanting direction and flowing down the water onto the slanting plate, pushing the low specific gravity particles in the pyrolysis residue to the lower side in the slanting direction and flowing out from the slanting plate. swung, this time, the groove direction one-
The moving speed of the inclined plate toward the end side, is solved by the method of recovering the pyrolysis residue metal is set higher relative to the moving speed of the inclined plate toward the other end side. As the inclined plate, a plurality of selection grooves are formed from the upper side to the lower side in the inclination direction. Among these selection grooves, those formed on the lowermost side in the inclination direction have the other end other than this. It is preferable to use the one formed so as to be located closer to the other end portion side in the groove direction than the end portion . The apparatus for recovering metal in pyrolysis residue according to the present invention supplies a pyrolysis residue containing a tilted plate and low-density particles made of a substance having a lower specific gravity than the tilted plate. And a means for supplying effluent that causes the low-gravity particles in the pyrolysis residue to flow downward in the inclination direction on the inclined plate, and the metal particles in the pyrolysis residue on the inclined plate. It is characterized in that the selection groove to be fastened to is formed along the direction intersecting the inclination direction. The depth of the sorting groove is preferably 0.5 to 5 mm, and the width thereof is preferably 5 to 10 mm.

[0005]

1 and 2 show a device for recovering metal in a pyrolysis residue of the present invention (hereinafter referred to as a metal recovery device).
1 shows an embodiment of a metal recovery device 1 shown here.
Is a slant plate 2, a pyrolysis residue supply unit 3 that serves as a pyrolysis residue supply unit that supplies the pyrolysis residue onto the slope plate 2, and a low specific gravity particle in the pyrolysis residue on the slope plate 2 in the slanting direction. The effluent water supply pipe 4 serves as a effluent water supply means for causing the effluent water to be pushed to the side to flow on the inclined plate 2.

The inclined plate 2 is formed in a rectangular shape, and a plurality of protrusions 5 are formed on the upper surface thereof along a direction substantially perpendicular to the inclination direction. These ridges 5 are formed in multiple stages from the upper side to the lower side of the inclined plate 2 in the inclination direction. The gap between the ridges 5 will be referred to as a selection groove 6 hereinafter. These ridges 5 form a sorting groove 6 on the inclined plate 2 to prevent the metal particles in the pyrolysis residue from being swept away by the flowing water and to keep the metal particles on the inclined plate 2.
The inclined plate 2 is formed so as to extend in the other end direction from one end of the inclined plate 2, and the length gradually increases in the inclination direction of the inclined plate 2, and the other end of the longest lower portion in the inclination direction is the inclined plate. It is formed so as to reach near the other end of No. 2.

If the height of the ridges 5, that is, the depth of the sorting groove 6 is too large, the amount of low specific gravity particles mixed into the recovered metal increases, and if it is too small, the sludge plate 2 is washed away by the falling water. Since the amount of metal particles flowing out from the inclined plate 2 increases and the metal recovery rate decreases, it is preferably 0.5 to 5 mm. Further, it is preferable that the interval between the protrusions 5, that is, the width of the selection groove 6 is 5 to 10 mm.

The inclination angle of the inclined plate 2 with respect to the horizontal plane, that is, the inclination angle α shown in FIG. 2, is preferably 2 to 10 degrees. This is because when the inclination angle is less than 2 degrees, the amount of low-density particles mixed into the recovered metal increases, and when it exceeds 10 degrees, the falling water pushes the inclined plate 2 and flows out from the inclined plate. This is because the amount of metal particles increases and the metal recovery rate decreases. A swinging device (not shown) is attached to the inclined plate 2, so that the inclined plate 2 can be swung along the groove direction of the selection groove 6.

At the other end of the inclined plate 2, there is provided a residual particle receiver 8 for recovering the particles remaining in the selection groove 6 as residual particles from the upper side to the lower side in the inclination direction, and at the lower edge thereof. Is provided with an outflow particle receiver 9 for collecting, as outflow particles, particles that have been washed away by the falling water and flowed out of the inclined plate 2 from one end side to the other end side.

The thermal decomposition residue supply unit 3 is provided at a position on one end side of the inclined plate 2 and on the upper side of the selection groove 6 in the inclination direction. The falling water supply pipe 4 is provided above the sorting groove 6 on the inclined plate 2 in the inclination direction from one end side to the other end side of the inclined plate 2, and the flowing water supply pipe 4 includes:
A plurality of downflow water supply holes 7 are provided at intervals in the lengthwise direction so that the downflow water can flow in a wide range from one end side to the other end side on the inclined plate 2.

Next, taking the above-mentioned device as an example,
An embodiment of the method for recovering the metal in the thermal decomposition residue of the present invention will be described. First, the thermal decomposition residue is supplied onto the inclined plate 2 through the thermal decomposition residue supply unit 3. The thermal decomposition residue is pulverized and sieved in advance to give an average particle size of 2 m.
It is preferable to use one having a thickness of m or less because the impurity content of the recovered metal can be suppressed to a low level. Further, it is preferable that the thermal decomposition residue is suspended in water, that is, supplied as a slurry on the inclined plate 2. At the same time, the falling water is supplied onto the inclined plate 2 by using the falling water supply pipe 4. In addition, it is possible to flow the spilled water not only from the spilled water supply pipe 4 but also from the thermal decomposition residue supply unit 3 onto the inclined plate 2.

At the same time, the inclined plate 2 is swung along the groove direction of the selection groove 6. At this time, the moving speed of the inclined plate 2 in one direction of the sorting groove 6 (the direction opposite to the residual particle receiving direction 8) is relative to the moving speed of the inclined plate 2 in the other direction (remaining particle receiving direction 8). Set higher. The rocking condition of the tilt plate 2 is not particularly limited, but a specific example is a case where the tilt plate 2 is rocked 230 to 280 times per minute.

The metal particles and low specific gravity particles in the pyrolysis residue supplied onto the inclined plate 2 are swept away by the flowing water, move in the inclination direction of the inclined plate 2 and enter the sorting groove 6. As described above, in the inclined plate 2, the moving speed of the inclined plate 2 in the one end direction (direction opposite to the residual particle receiving 8 direction) of the sorting groove 6 is inclined in the other end direction (remaining particle receiving 8 direction). The metal particles and the low specific gravity particles in the sorting groove 6 move in this direction together with the inclined plate 2 when the inclined plate 2 moves in the other end direction because the metal particles and the low specific gravity particles in the sorting groove 6 move so as to be higher than the moving speed of the plate 2. Easy,
In addition, when the inclined plate 2 moves toward one end, it becomes difficult to move in this direction due to inertial force, and thus gradually moves toward the other end of the selection groove 6.

At this time, among the pyrolysis residues, low specific gravity particles made of carbide or the like derived from synthetic resin have a low specific gravity, so that they are easily swept in the inclined direction by running water over the ridges 5. Therefore, most of the low specific gravity particles have a moving speed in the tilting direction of the tilting plate that is higher than a moving speed in the other end direction of the tilting plate, and the tilting direction of the tilting plate 2 before reaching the other end of the sorting groove 6. It flows out from the lower side and collects on the outflow particle receiver 9.

On the other hand, metal particles derived from copper wire, etc.
Since it has a high specific gravity, it is hard to be washed away by the falling water and easily stays in the sorting groove 6. Therefore, most metal particles are
The moving speed in the other direction of the inclined plate becomes faster than the moving speed in the inclined direction of the inclined plate, and the inclined plate 2 exits from the other end of the sorting groove 6 before reaching the lowermost portion in the inclined direction.

As described above, since the ridge 5 is formed such that the one end of the inclined plate 2 serves as a base point and the length thereof gradually increases in the inclination direction of the inclined plate 2, the selection groove 6 is The other end of the lowermost one in the tilt direction is the other sorting groove 6
Is located on the other end side in the groove direction as compared with the other end.

Therefore, the metal particles that come out of the sorting grooves 6 other than the sorting groove 6 located on the lowermost side in the tilt direction flow in the tilting direction by the flowing water, reach the inside of the sorting groove 6 adjacent to the lower side, and finally reach the final position. Specifically, it reaches the inside of the sorting groove 6 on the lowermost side. Since the sorting groove 6 on the lowermost side is provided so that the other end is located near the other end of the inclined plate 2,
The metal particles in the inside exit from the other end of the sorting groove 6 and then collect on the residual particle receiver 8 provided at the other end of the inclined plate 2.

When the thermal decomposition residue contains a chlorine compound, the chlorine compound dissolves in the flowing water and flows out from the inclined plate 2. Therefore, the chlorine compound is collected on the residual particle receiver 8 and the outflow particle receiver 9. The content of chlorine in the obtained metal particles and low specific gravity particles decreases. In performing the above operation, the spilled water that has flowed down from the sloping plate 2 may be discharged as it is, but it is necessary to return it to the spilling water supply pipe 4 and to flow it again on the sloping plate 2 through the spilling water supply pipe 4 to reduce the operating cost. From the viewpoint of.

The metal particles collected on the residual particle receiver 8 can be recycled as a metal product raw material.
On the other hand, since the low specific gravity particles collected on the outflow particle receiver 9 contain a large amount of carbide, they can be reused as fuel or the like.

In the above metal recovery method, the pyrolysis residue is supplied onto the inclined plate 2 having the sorting groove 6 and the flowing water is caused to flow over the inclined plate 2 to incline the low specific gravity particles in the pyrolysis residue. The metal particles remaining in the sorting groove 6 of the inclined plate 2 are washed away by the residual particle receiver 8
Since the low specific gravity particles in the thermal decomposition residue are efficiently separated from the metal particles, the metal particles having a low impurity content can be efficiently and easily recovered.

As the inclined plate 2, a plurality of sorting grooves 6 are provided.
However, by using the one formed so that the other end of the lowermost one is located closer to the other end in the groove direction than the other ends of the other sorting grooves 6, Finally, the metal particles can be collected on the residual particle receiver 8 after passing through the other end of the sorting groove 6 on the lowermost side. Therefore, the metal particles in the sorting groove 6 can be easily collected in one place, and the metal recovery operation can be facilitated.

Further, the residual particles and the metal particles and the low specific gravity particles obtained as the outflow particles can be reused, respectively, so that the disposal cost can be reduced. Further, it is possible to prevent heavy metals such as Cu and Pb in the thermal decomposition residue from being released into the environment due to the waste treatment, which is also preferable from the viewpoint of environmental protection. Furthermore, even if a chlorine compound is contained in the thermal decomposition residue, the chlorine compound is washed away with running water, and the recovered metal particles or low specific gravity particles are
The chlorine content is low, and no harmful gas such as chloride gas is emitted during heating, so that the safety can be improved.

Further, in the metal recovery device 1, the inclined plate 2, the thermal decomposition residue supply unit 3 for supplying the thermal decomposition residue onto the inclined plate 2, and the low specific gravity particles in the thermal decomposition residue in the inclination direction. Since there is a falling water supply pipe 4 for supplying the falling water that flows to the lower side and flows out from the inclined plate 2, a sorting groove 6 for retaining the metal particles in the pyrolysis residue on the inclined plate 2 is formed on the inclined plate 2. The low specific gravity particles in the thermal decomposition residue can be efficiently separated, and the metal particles having a low impurity content can be efficiently and easily recovered.

The metal recovery method of the present invention is not limited to that of the above embodiment, and the residual particles recovered by the above operation can be subjected to the same step again, whereby the impurity content is lower. The metal can be recovered. In this case, the inclination angle of the inclined plate 2 used in the second and subsequent recovery operations is set to the inclination plate 2 used in the first recovery operation.
It is preferable to make it larger than the inclination angle of No. 1 to make it easier to separate and remove the low specific gravity particles as impurities mixed in the metal particles by the first operation.

[0025]

EXAMPLES Hereinafter, the effects of the present invention will be clarified by showing concrete examples. (Examples 1 to 4) A recovery test of metal in the pyrolysis residue sample was conducted using the metal recovery apparatus 1 shown in FIG. In the metal recovery device 1 used here, the width of the inclined plate 2 (the length in the inclination direction) is 4
6.6 cm, length (length perpendicular to the tilt direction)
Is 84.4 cm, 22 protrusions 5 are formed on the inclined plate 2 in the inclination direction, and the width of these protrusions 5 is 6 m.
m, and the height (the depth of the selection groove 6) was 0.6 to 3.4 mm. The width of the selection groove 6 between the protrusions 5 was 8 mm.
The inclination angle of the inclined plate 2 was 3 to 7 degrees.

As the pyrolysis residue sample, a shredder dust derived from home electric appliances was heat-treated and then pulverized by a pulverizer to a particle size of about 2 mm. 92.8 g of this thermal decomposition residue was suspended in 50 ml of water,
This was supplied onto the inclined plate 2 from the thermal decomposition residue supply unit 3 of the recovery device 1. At the same time, the flow rate of the flowing water is 3300 ml / mi through the flowing water supply pipe 4 and the pyrolysis residue supply unit 3.
n on the inclined plate 2. Further, the inclined plate 2 was swung in the direction along the selection groove 6, and at this time, the moving speed of the inclined plate 2 in one end direction was set to be higher than the moving speed in the other end direction. By the above operation, the particles remaining in the sorting groove 6 and the particles washed away by the falling water were collected on the residual particle receiver 8 and the outflow particle receiver 9, respectively.

(Embodiment 5) A metal recovery operation is carried out in the same manner as in Embodiments 1 to 4, and then the residual particles collected on the residual particle receiver 8 are suspended again in 50 ml of water. It was supplied onto the inclined plate 2 and the metal recovery operation was performed again according to the above process. The inclination angle of the inclined plate 2 was 2 degrees during the first recovery operation and 3.5 degrees during the second recovery operation. The contents of metal and non-metal components in the residual particles and outflow particles collected by the above Examples 1 to 5 (weight basis), and the recovery of the metal components recovered in residual particles (weight basis) were measured. did. The test results are shown in Tables 1 and 2.

[0028]

[Table 1]

[0029]

[Table 2]

From Table 1, Cu, which is the most contained as a metal component in the pyrolysis residue sample, has a content rate in the residual particles of
The content is much higher than that in the pyrolysis residue sample,
It can be seen that the metal particles having a low impurity content could be collected by the collection methods of ~ 5. Further, it can be seen from Table 2 that the metal particles in the pyrolysis residue sample could be recovered with high efficiency by the recovery methods of Examples 1 to 5.

[0031]

As described above, in the method for recovering metal in the pyrolysis residue of the present invention, the low specific gravity particles in the pyrolysis residue are efficiently separated, and the metal particles having a low impurity content are efficiently separated. It can be collected well and easily. Further, the obtained metal particles and low specific gravity particles can be reused, respectively, so that the disposal cost can be reduced.
Further, it is possible to prevent the heavy metal in the thermal decomposition residue from being released into the environment due to the waste treatment, which is also preferable from the viewpoint of environmental protection.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a metal recovery device of the present invention.

FIG. 2 is a side view of the recovery device shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Metal recovery device, 2 ... Inclined plate, 3 ... Pyrolysis residue supply part (pyrolysis residue supply means), 4 ... Flowing water supply pipe (flowing water supply means), 6 ...・ Selection groove

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Claims (3)

(57) [Claims] 1. A method for recovering metal particles in a pyrolysis residue containing metal particles and low specific gravity particles made of a substance having a lower specific gravity than that using an inclined plate, wherein the inclined plate has an upper surface, Using a sorting groove that holds metal particles in the pyrolysis residue on the inclined plate along the direction that intersects the inclination direction, the pyrolysis residue is supplied to the upper side in the inclination direction from the selection groove on the inclined plate. Flowing water is flown on the inclined plate, the low specific gravity particles in the pyrolysis residue are pushed to the lower side in the inclined direction and flowed out from the inclined plate, while the inclined plate is swung along the groove direction of the selection groove. A method for recovering metal in a pyrolysis residue, characterized in that the moving speed of the inclined plate toward one end side in the direction is set higher than the moving speed of the inclined plate toward the other end side . 2. As the inclined plate, a plurality of selection grooves are formed from the upper side to the lower side in the inclination direction, and these selection grooves are
More groove direction end than the other end portion of the other end portion but is formed in the inclined direction bottom side of these other sorting groove
The method for recovering the metal in the pyrolysis residue according to claim 1, wherein a metal formed so as to be located on the side of the section is used. 3. A slant plate, a pyrolysis residue supply means for supplying a pyrolysis residue containing metal particles and low specific gravity particles made of a substance having a specific gravity lower than that to the slope plate, and Equipped with a sewage supply means for flowing the sewage that pushes the low specific gravity particles to the lower side in the tilt direction on the tilt plate, and in the tilt direction, a sorting groove that holds the metal particles in the pyrolysis residue on the tilt plate. A device for recovering metal in a pyrolysis residue, which is formed along the intersecting direction.