JP3374709B2 - Separation method and apparatus for granulated slag in waste melting furnace - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste melting furnace for directly melting general waste and industrial waste, and a granulated slurry of the waste melting furnace for treating the melt discharged from the melting furnace.
TECHNICAL FIELD The present invention relates to a lug sorting method and a sorting apparatus .

[0002]

2. Description of the Related Art Conventionally, there is, for example, an apparatus for treating a melt discharged from a waste melting furnace as shown in FIG. 2 (JP-A-8-187485). Here, below the open outlet port 2 of the melting furnace 1, a water granulation device 4 for granulating and solidifying the melt 3 is installed. A rotary drum type magnetic separator 8 is connected to scrape the solidified material 5 accumulated in the water granulator 4 from water and then separate it into a solidified material 6 of slag and a solidified material 7 of metal.

The melt 3 constantly discharged from the melting furnace 1 is
It falls into the water 9 in the water granulator 4. The solidified product 5 that has been rapidly cooled in water 9 and made into fine particles settles on a conveyor 10 installed so as not to be scratched out from the water, and is supplied to a rotary drum type magnetic separator 8 installed downstream thereof. Since the solidified metal 7 exhibits magnetism, the permanent magnet 1 installed in the drum 11
The non-magnetic slag solidified product 6 is attracted to the drum surface 13 and adsorbed to the drum surface 13, and the nonmagnetic slag solidified product 6 rotates at a relatively high speed.
It is blown away by the centrifugal force of 1. In addition, solidified metal 7 adsorbed on the drum surface 13 of the rotary drum type magnetic separator 8
Is a scraper 1 installed close to the drum surface 13.
4 scraped off the drum surface. Through such a series of processes, the solidified product 6 of slag and the solidified product 7 of metal are separated, and the solidified product 6 of slag is reused as a roadbed material or an aggregate.

[0004]

Here, when observing the molten product that is actually granulated by water, the solidified product of metal often has a larger particle size than the solidified product of slag. A solidified product of a metal having a large particle size is more strongly adsorbed by the magnetic separator and covers the drum surface of the magnetic separator. Therefore, a sufficient amount of suction force cannot be obtained for the metal particles having a small particle diameter, and the metal component is shaken off from the magnetic separator due to the centrifugal force of the drum rotating at a high speed. Solidified substances that do not adsorb to the drum result in being mixed as impurities into the slag that is recovered for the purpose of reuse.To avoid this, either introduce a magnetic separator with a wide adsorption surface, or slow down the rotation speed of the drum. Therefore, it is necessary to reduce the centrifugal force. However, this inevitably increases the size of the device or decreases the processing capacity.

The present invention has been made in view of the above problems of the prior art. In order to efficiently remove the metal component from the granulated solidified product of water and to stably recover high quality slag. Method and equipment for water granulated slag in waste melting furnace in Japan
The purpose is to provide storage .

[0006]

According to a first aspect of the present invention, in the processing of molten slag from a melting furnace that directly melts waste, the molten material consisting of slag and metal is cooled in water to form particles.
It generates a phased solidified product, while fractionating solidified product was granulated in two stages of fine and coarse particles by the particle size, solidified and granulated
Of the things, the solidified product of slag is finely divided and separated into fine particles,
Furthermore, a method for separating granulated slag in a waste melting furnace, characterized in that the solidified product of slag is efficiently recovered by magnetically separating only the solidified product of fine particles to remove the solidified product of metal Is.

Further, in the invention of claim 2, in the treatment of slag melt from a melting furnace for directly melting waste, a water granulating device installed below the slag opening of the waste melting furnace and an underwater The slag is solidified from the granulated solidified material while separating the solidified material scraped out from the granulated material into two stages of fine particles and coarse particles.
And grain径選another machine for sorting objects to be comminuted to a fine particle side, particle径選
It is a device for separating water granulated slag of a melt of a waste melting furnace, which is composed of a magnetic separator installed on the fine grain side separated by a separate machine .

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, most of the metal content of the water-solidified solidified product is solidified as large-sized particles,
On the other hand, slag is made based on the finding that the degree of grain refinement is high and the strength is brittle, so that the grain size becomes small.

An example of an embodiment of the present invention will be described below with reference to FIG. From the slag port 2 that is always opened below the waste melting furnace 1, the continuously smelted melt 3 falls into the water 9 of the water granulation device 4. The melt 3 is rapidly cooled in water to become a granulated solidified product 5.

The solidified material 5 settles, falls onto a conveyor 10 for continuously carrying out solid material, and is scraped out of the water 9. The solidified product 5 carried out is sorted into two types, that is, fine particles and coarse particles, by a particle size selector 15 located downstream thereof, for example, a vibrating screen or a trommel type rotary screen. At this time, due to the vibration and rotation of the sieve 16 in the particle size sorter, the solid slag solid 7 that is fragile in strength is further refined, and as a result, passes through the sieve 16.

The particle size of the solids depends on the quality of the waste to be melted,
It depends on the operating conditions of the melting furnace and the conditions of water granulation.
Therefore, the boundary grain size for grain size separation is set, for example, in the range of 1 to 10 mm in consideration of these conditions. The solid material that cannot pass through the sieve 16 is the metal particles 18 having a large particle diameter, and thus is stored in the metal receiving container 19 through the passage 17.

In the solid matter that has passed through the sieve 16, the solid matter 6 of the slag and the solid matter 7 of the fine granules that have become fine particles at the stage of water granulation.
Should be included together. Since the solid metal 7 is a magnetic substance, it is finally separated by the magnetic separator 8 installed in the latter stage of the sieve 16. The magnetic separator 8 may be a conveyor type or any other known type other than the rotary drum type shown here. The solids separated by the magnetic separator 8 are stored in a metal receiving container 19 and a slag receiving container 20 respectively.

(Embodiment) FIG. 1 shows an embodiment of the present invention. From the slag port 2 which is always opened below the melting furnace 1, the continuously melted melt 3 falls into the water 9 of the water granulation device 4. The melt 3 is rapidly cooled in water to form a solidified product 5 which has been made into fine particles. The solidified product 5 is settled on a conveyor 10 installed to scrape it out of water, and is divided into two stages of fine particles and coarse particles by a vibrating screen 15 which is a particle size selector located downstream thereof.

Further, even if the solid material 5 is a coarse particle before being charged, if the slag is brittle in terms of strength, cracking or chipping occurs due to vibration, and the particle is further refined, resulting in passing through the sieve 16. To do. Since the particle size of solids varies depending on the quality of the waste to be melted, the operating conditions of the melting furnace, and the conditions of water granulation, the boundary particle size for particle size separation is 1 to 10 mm. To set. Coarse-grained metal solids 18 that cannot pass through the sieve 16 are stored in the metal receiving container 18 via the passage 17 at this stage.

The solid matter that has passed through the sieve 16 contains both the slag solid matter 6 and the fine-grained metal solid matter 7. Make a proper separation. The drum rotary type magnetic separator 8
A drum 11 rotatable about a shaft 20, a permanent magnet 12 mounted inside the drum, a feeder 21 for supplying the solid particles 5 to the drum 11, and a scraper installed near the drum 11. ． It is composed of a par 14. Of the solid matter supplied to the drum surface 13 by the feeder 21, the non-magnetic slag that is not adsorbed by the permanent magnets 12 in the drum 11 is blown off by the centrifugal force associated with the rotation of the drum 11 and stored in the slag receiving container 2O. Be recovered. on the other hand,
The solid matter 7 of a magnetic metal, which is a magnetic material, is adsorbed on the surface of the drum 13, is peeled off from the drum surface 13 by the scraper 14, and is housed in a slag receiving container 19 installed below the drum.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an example of an example of an embodiment of the present invention.

FIG. 2 is an explanatory view of a conventional melt processing apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Melting furnace, 2 ... Slag port, 3 ... Melt material, 4 ... Granulating device,
6 ... Slag, 7 ... Metal, 12 ... Magnetic separator, 15 ... Vibrating sieve (particle size selector), 16 ... Sieve, 18 ... Metal (large particle size).

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nao Nakamura 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Steel Pipe Co., Ltd. (56) Reference JP-A-62-172107 (JP, A) JP-A-9 -59046 (JP, A) JP 9-59047 (JP, A) JP 61-37930 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B09B 3/00- 5/00

Claims (2)

(57) [Claims] 1. In the treatment of slag melt from a melting furnace for directly melting waste, the melt consisting of slag and metal is cooled in water and granulated.
Of the granulated solidified material is generated, and the granulated solidified material is classified into two stages of fine particles and coarse particles according to the particle size.
Among them, the solidified product of slag is finely divided and separated to the fine particle side, and only the solidified product of fine grain is magnetically separated to remove the solidified metal, thereby efficiently recovering the solidified product of slag. Method for separating water granulated slag in a waste melting furnace. 2. In the treatment of slag melt from a melting furnace for directly melting waste, a water granulating device installed below the slag outlet of the waste melting furnace,
The slag of the granulated solidified matter is separated into two stages of finely divided and coarsely divided solidified matter scraped out from water according to the particle size.
A particle size sorter that atomizes the solidified product of and separates it into fine particles ,
An apparatus for separating water granulated slag from a melt in a waste melting furnace, which is composed of a magnetic separator installed on the fine grain side separated by a particle size selector .