JP2001017883A - Metal recovering apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal recovering apparatus for recovering metals such as iron, stainless steel, copper or the like from waste. SOLUTION: A metal recovering apparatus is equipped with a column 1 forming an ascending flow channel, an acting fluid supply system opened to a metal recovering system 17 at the position on the bottom part side of the column 11 and supplying the liquid flow of an acting fluid into the column 11 at a predetermined speed, the slag supply system 13 communicating with the column 11 on the way thereof to supply particulate slag M/S and the metal recovering system 17 having the valve 18 communicating with the bottom part of the column 11 and a flow field having the energizing force against gravity is formed in the column 11 by an ascending flow F and the particulate slag M/S originates from waste or the incineration residue of waste and the slag formed in a surface melting furnace is crushed up to a proper particle size.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for recycling waste such as industrial waste, municipal waste and general waste, and more particularly to a metal recovery apparatus for recovering valuable resources from waste.

[0002]

2. Description of the Related Art Conventionally, wastes such as industrial wastes, municipal wastes, and general wastes are subjected to final disposal of incineration residues or slag obtained by melting and processing the incineration residues. However, landfill disposal is accompanied by a decrease in forest resources and the number of fishing grounds due to a decrease in the number of beaches, making it difficult to secure land for landfills in terms of environmental conservation. From the viewpoint of environmental conservation, including the securing of disposal sites, there is a need to improve the recycling rate.

[0003]

By the way, wastes such as industrial wastes, municipal wastes and general wastes contain metals as valuable resources, and it is necessary to collect and recycle these metals. It is important to reduce the amount of landfill disposal and to make effective use of resources. In recent years, metals have been separated and collected in advance, but it is difficult to separate them by incorporating them into members made of other materials, and many of them are incinerated.

Conventionally, when recovering metals incorporated in a member made of another material, waste is crushed and iron is sorted out from the crushed material by magnetic force.
In particular, there was no effective means for sorting copper. In the field of beneficiation equipment, there is one related to flotation technology, for example, as disclosed in JP-A-62-144771. This relates to a column flotation method for a carbonaceous substance, particularly coal, as shown in FIG.

In FIG. 5, a coal-based slurry to be supplied to the inlet 1 is obtained by adding a water treatment agent to pulverize raw coal into fine particles to remove unnecessary rocks and heavy ash, and to make the ash more hydrophilic. Things. Before the slurry reaches the spray nozzle 2, it is aerated by air introduced from the inlet 3, and the aerated slurry forms foam after leaving the spray nozzle 2. Upon formation of this foam, water containing most of the hydrophilic material flows to the bottom of the column. The foam containing the solid carbonaceous component to be separated rises up the column 4. Water supplied in a downward flow from the inlet 5 through the spray rod 6 drains the hydrophilic substances from the foam, and the foam containing solid carbon particles, such as coal, enters the collection pan 7 and is separated.

[0006] However, in this method, it is essential that the object to be separated is finely pulverized and rises in the column together with the foam, so that it can be applied to solid carbonaceous material, It cannot be applied to slag separation. An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a metal recovery apparatus that can recover metals such as iron, stainless steel, and copper from waste.

[0007]

According to a first aspect of the present invention, there is provided a metal recovery apparatus, comprising: a column forming an upward flow path; and a slag recovery system communicating with a top of the column. And a metal recovery system having a valve in communication with the bottom of the column, and a working fluid supply system that opens toward the metal recovery system at a position on the bottom side of the column and supplies a liquid flow of a working fluid into the column at a predetermined speed. And a slag supply system that communicates with the middle of the column and supplies granular slag as a slurry with a carrier fluid.The granular slag is derived from waste or the incineration residue of waste and is generated in a melting furnace. The slag is crushed to an appropriate particle size, and a flow field having an urging force against gravity is formed in the column by the upward flow of the working fluid.

[0008] With the above-mentioned configuration, when waste or incineration residue crushed into an appropriate shape is melted in a melting furnace as a pretreatment, metals and other inorganic substances contained in the waste are melted, and molten slag and metal particles are melted. Generate The slag mass generated by dropping the molten slag into the cooling water is adjusted to a particle size similar to that of the metal particles by crushing, for example, particles of about 0.8 mm, and a granular slag composed of the metal particles and the slag particles is generated. . The specific gravity of the metal particles differs from that of the slag particles due to the difference in the components.

When granular slag is placed in an upward flow path that forms a flow field having a biasing force against gravity, each particle of the granular slag receives from the liquid flow of the working fluid in the flow field. It rises or falls by the difference between the biasing force and the gravity it receives. At this time, the urging force of the liquid flow in the flow field is greater as the specific gravity is lower, and is smaller as the specific gravity is higher.Slag particles having a lower specific gravity float upward, and metal particles having a higher specific gravity settle downward. I do.

Therefore, by adjusting the flow rate of the liquid flow of the working fluid supplied from the working fluid supply system to the column to an appropriate predetermined speed, the slag particles in the granular slag supplied from the slag supply system to the middle of the column can be reduced. It rises in the column to the top, flows out of the column through the slag recovery system, and the metal particles settle and stay at the bottom of the column. Since the working fluid ejected from the working fluid supply system into the column is ejected toward the metal recovery system, the layer of metal particles stagnating at the bottom of the column is constantly stirred, and the slag particles buried in the layer of metal particles are lifted. So that slag particles do not eventually remain in the metal particle layer.

The metal particles staying in a layer at the bottom of the column are discharged from the column to the outside by opening a valve of the metal recovery system. Therefore, the slag particles and the metal particles can be easily separated and collected. The metal recovery apparatus according to the present invention according to claim 2 includes a column forming an upward flow path, a slag recovery system communicating with a top of the column, a metal recovery system having a valve communicating with a bottom of the column, and a column. A working fluid supply system that supplies a liquid flow of the working fluid at a predetermined speed into the column at the bottom side of the container, and is provided with a working fluid supply system. Granular slag produced by crushing slag generated in a furnace to an appropriate particle size is supplied from the working fluid supply system to the bottom side of the column together with the working fluid, and the urging force against the gravity is caused by the upward flow of the working fluid into the column. Is formed to form a flow field having

According to a third aspect of the present invention, there is provided a metal recovery apparatus,
By making the diameter of the flow path on the top side of the column smaller, the separated slag is quickly discharged.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a column 11 is a cylindrical body having a uniform cross section of a flow path forming an upward flow path. Column 1
A working fluid supply system 12 communicates with the bottom side of the column 1. The working fluid supply system 12 supplies a flow of working fluid (water) at a predetermined speed by a pump or the like (not shown). Is opened toward a metal recovery system 17 described later.

A slag supply system 13 communicates in the middle of the column 11, and the slag supply system 13 supplies the granular slag as a slurry with a carrier fluid.
Are located above a slag collecting section 16 described later.
A slag recovery system 15 communicates with the top of the column 11, and the slag recovery system 15 has a slag recovery unit 16 that is opened around the top opening of the column 11 and has a bottom surface inclined. A metal recovery system 17 communicates with the bottom of the column 11, and the metal recovery system 17 has a valve 18.
The portion above 8 is a metal recovery portion 17a.

Granular slag is derived from waste or incineration residue of waste, and is obtained by crushing slag produced in a surface melting furnace to an appropriate particle size. In this surface melting furnace, wastes to be melted are deposited and arranged in a ring in a furnace to form a combustion chamber inside, and the diameter of the waste facing the combustion chamber is reduced toward the furnace bottom. It has a discharge port at the bottom of the furnace.

In this surface melting furnace, wastes and the like are melted in the surface layer facing the combustion chamber, and the generated molten slag is guided to the discharge port along the surface of the wastes and the like, and cooling outside the furnace is performed from the discharge port. Drops in water to form slag mass. For this reason, the slag mass contains particles contained in the waste and the like as particles, and the shape of the slag is close to a spherical shape due to melting. The metals may be mainly copper or other metals such as iron.

When the slag mass is adjusted to a particle having an appropriate particle size, for example, a particle size of 0.8 mm by crushing, a granular slag M / S composed of metal particles M and slag particles S is obtained. The metal particles M and the slag particles S have different specific gravities due to differences in components. The granular slag M / S is subjected to a flow field having an urging force opposing gravity, that is, the upward flow F of the column 11.
, Each particle of the granular slug M / S rises or falls due to the difference between the biasing force received from the liquid flow of the working fluid in the flow field and the gravity received by itself. At this time, the urging force of the liquid flow in the flow field has a greater effect as the specific gravity is lower, and has a smaller effect as the specific gravity is higher.Slag particles having a lower specific gravity float upward, and metal particles having a higher specific gravity settle downward. I do.

Table 1 shows that 1 t of granular slag M / S containing particles of various particle sizes is supplied to the column 11 at a rate of 3.0 t / h, and the rising speed of the upward flow F is 13.9 cm / s. 3 shows the particle size distribution of the slag particles S and the metal particles M in the case where.

[0019]

[Table 1] From Table 1, 88.61% of the slag particles S flowing into the metal recovery section have a particle size of 1.18 to 2.36 mm, and 11.03% have a particle size of 600 to 1180 μm. It can be seen that a boundary value for separating the copper particles M and the slag particles S exists near the grain size of 0.8 mm.

Therefore, it is necessary to appropriately select the particle size of the granular slag M / S obtained by crushing the slag mass depending on the specific gravity of the metal, but this value can be obtained in advance by empirical rules. Under the condition of selecting an appropriate particle size, the slag particles S and the metal particles M are separated by adjusting the flow velocity of the upward flow F to an appropriate predetermined speed. For this reason, the flow rate of the working fluid supplied from the working fluid supply system 12 to the column 11 is adjusted, and the flow rate of the upward flow F in the column 11 is adjusted to an appropriate predetermined speed. In this state, when the granular slag M / S is supplied from the slag supply system 13 to the middle of the column 11, the slag particles S in the granular slag M / S rise in the column 11 and pass from the top opening to the slag collection unit 16. And flows out of the column 11 through the slag recovery system 15, and the metal particles M settle at the bottom of the column 11 and stay there.

The working fluid ejected from the working fluid supply system 12 into the column 11 is supplied to the metal recovery section 17 of the metal recovery system 17.
a, the layer of metal particles M staying at the bottom of the column 11 is constantly stirred, and the slag particles S buried in the layer of metal particles M are lifted. No slag particles S remain therein. Column 11
The metal particles M staying in a layer at the bottom of the slag supply system 1
3 with the slurry supply from the metal recovery system 1 stopped.
By opening the valve 18 of 7, the gas is discharged from the column 11 to the outside.

As shown in FIG. 2, the column 11 may be formed such that the upper flow path 11a on the top side is reduced in diameter. In this case, the flow rate of the upward flow F in the upper flow path 11a is reduced. And slag particles S can be discharged quickly.
As shown in FIG. 3, the granular slag M / S can be supplied from the working fluid supply system 12 to the bottom side of the column 11 together with the working fluid. In this case, as shown in FIG. 11 can also reduce the diameter of the upper channel 11a on the top side.

[0023]

As described above, according to the present invention, the specific gravity is reduced by placing the granular slag in the upward flow path which forms a flow field having a biasing force against gravity. Slag particles and metal particles with large specific gravity can be separated,
Metal particles can be easily recovered from waste.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a metal recovery device showing an embodiment of the present invention.

FIG. 2 is a schematic view of a metal recovery apparatus showing another embodiment of the present invention.

FIG. 3 is a schematic view of a metal recovery apparatus showing another embodiment of the present invention.

FIG. 4 is a schematic view of a metal recovery apparatus showing another embodiment of the present invention.

FIG. 5 is a schematic diagram showing a configuration of a conventional sorting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Column 12 Working fluid supply system 13 Slag supply system 15 Slag recovery system 16 Slag recovery part 17 Metal recovery system 18 Valve

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shiro Uebayashi 2-47, Shikitsu-Higashi 1-chome, Naniwa-ku, Osaka-shi, Osaka (72) Inventor Masaharu Okada Shikitsu-Higashi, Naniwa-ku, Osaka, Osaka No. 2-47, Kubota Co., Ltd. (72) Inventor Yosuke Kamata 1-47, Shikitsu Higashi, Naniwa-ku, Osaka City, Osaka Prefecture F-term (reference) 4D071 AA64 AB04 AB14 BB03 BB13 DA15

Claims (3)

[Claims] 1. A column forming an upward flow path, a slag recovery system communicating with a top of the column, a metal recovery system having a valve communicating with a bottom of the column, and a metal recovery system at a position on the bottom side of the column. And a slag supply system that communicates in the middle of the column and supplies granular slag as a slurry with a carrier fluid. , The granular slag is waste,
Alternatively, the slag generated in the melting furnace, which originates from the incineration residue of waste, is crushed to an appropriate particle size, and a flow field having a biasing force against the gravity is formed in the column by the upward flow of the working fluid. A metal recovery device, characterized in that: 2. A column forming an upward flow path, a slag recovery system communicating with a top of the column, a metal recovery system having a valve communicating with a bottom of the column, and a metal recovery system having a valve at a bottom side of the column. And a working fluid supply system that supplies a liquid flow of the working fluid into the column at a predetermined speed.The slag generated in the melting furnace derived from the waste or the incineration residue of the waste has an appropriate particle size. The granular slag, which has been crushed into particles, is supplied from the working fluid supply system to the bottom of the column together with the working fluid, and a flow field with a biasing force that resists gravity is formed in the column by the upward flow of the working fluid. A metal recovery device. 3. The metal recovery according to claim 1, wherein a mechanism for rapidly discharging the separated slag is constituted by reducing the diameter of the flow path on the top side of the column. apparatus.