JP2012012148A - Slag conveying device - Google Patents

Abstract

To provide a slag conveying device capable of effectively preventing perforation due to wear of a portion where slag falls in a conveying process.
In a high-temperature slag processing apparatus used for high-temperature slag processing that primarily cools high-temperature slag and then performs secondary cooling while moving inside the cooling apparatus, the slag discharged from the outlet of the cooling apparatus is removed. A slag transfer device including a conveyor 16 to be transported and an outlet chute 17 for discharging slag from the conveyor 16, and a slag reservoir 18 at a dropping point of the slag falling into the outlet chute 17 from the conveyor 16 The housing which becomes is provided.
[Selection] Figure 2

Description

  The present invention relates to a slag transfer device.

  Conventionally, when separating the metal contained in steelmaking slag discharged at a high temperature of 1200 ° C or higher, as a pre-process of the separation work, the high-temperature slag is allowed to cool in the cooling pit for several hours to a temperature at which there is no danger of steam explosion After the cooling, in order to further proceed the cooling, a cooling step of cooling while sprinkling the cooling water for several hours was necessary. In addition, the slag after the cooling process was then classified and separated from the slag in large chunks, medium chunks and small chunks, while repeatedly passing through a crusher and a magnetic separator. Thus, the separated bullion may not be sufficiently separated from the slag, and it has been difficult to stably obtain a bullion with a high iron content.

  In contrast, the applicant of the present invention can efficiently recover the metal contained in the steel slag without causing a steam explosion or fire, and obtain a metal with a high iron content. Rotary cooler for the purpose of providing a recovery method and a method capable of recovering bullion contained in steelmaking slag without requiring excessive facilities and costs and suppressing dust scattering The steelmaking slag is charged in a high temperature state around 1000 ° C. inside, and by rotating the rotary cooler provided with protrusions on the inner surface of the shell, the steelmaking slag is cooled while applying a crushing action due to a drop impact, The technique which isolate | separates the bullion contained in steelmaking slag is disclosed (patent document 1).

  In the method for separating metal in steelmaking slag described in Patent Document 1, high-temperature steelmaking slag of 1300 to 1500 ° C. discharged from the steel making process was cooled to 800 to 1250 ° C. in a cooling pit (hereinafter referred to as primary cooling). Then, it is put into the rotary cooler through the hopper. At the entrance of the hopper, a lattice-shaped vibrating screen called a vibrating grizzly is installed, and the large ingots in the steelmaking slag are collected here. Next, the steelmaking slag that has passed through the vibration grizzly is charged into the rotary cooler while being in a high temperature state of about 800 to 1250 ° C. by the cutting device 30 such as a vibration feeder. The rotary cooler has a structure having protrusions on the inner surface of the shell, and can cool the steelmaking slag by applying a crushing action due to a drop impact by rotating the shell, thereby separating the metal contained in the steelmaking slag. it can. The steelmaking slag thus crushed and separated from the metal is then discharged from the outlet chute onto the conveyor.

  However, since the slag cooled to about 100-300 ° C through the rotary cooler has a high hardness, the slag is dropped in the conveying process (conveyor outlet chute, etc.) and wears holes. There was a problem that it was easy.

JP 2009-127094 A

  An object of the present invention is to provide a slag transport device that solves the above-mentioned problems and can effectively prevent perforations due to wear of a portion where the slag falls in the transport process.

The slag conveying device of the present invention made to solve the above problems is a high-temperature slag processing apparatus used for processing high-temperature slag that primarily cools high-temperature slag and then performs secondary cooling while moving inside the cooling device. A slag conveying device comprising a conveyor for conveying slag discharged from the outlet of the cooling device, and an outlet chute for discharging slag from the conveyor,
A casing serving as a slag reservoir is provided at the point of slag falling from the conveyor into the discharge chute.

  The invention according to claim 2 is the slag conveying device according to claim 1, wherein the conveyor conveys the slag from the outlet of the cooling device, and the tripper conveyor conveys the slag carried by the inclined conveyor to the product pit. It is characterized by being.

  According to a third aspect of the present invention, in the slag transfer device according to the second aspect, the high temperature slag is a steelmaking slag or a hot metal pretreatment slag.

  Invention of Claim 4 is the slag conveyance apparatus of Claim 2, The temperature of the slag which finished primary cooling is 800-1250 degreeC, The temperature of the slag which finished secondary cooling is 300-100 degreeC. It is a feature.

  The vibration grizzly according to the present invention has a configuration in which a casing serving as a slag reservoir is provided at the dropping point of the slag falling from the conveyor into the discharge chute. The slag accumulates in this slag reservoir portion and exhibits the function of cell flying, so that it is possible to effectively prevent perforation due to wear of the portion where the slag falls in the conveying process.

  According to cell flying using slag with low thermal conductivity, for example, compared to the case where a lining material such as a refractory is applied at the slag drop point, the thermal load on the lining structure can also be reduced. . In addition, according to the cell flying structure in which the slag continuously conveyed by the conveyor is collected in the slag reservoir provided at the dropping point of the slag falling into the discharge chute and the portion is lined, for example, the first Even if the slag that lined the part is lost, it can be quickly recovered by the slag that falls next, so that the state of self-flying construction can be maintained stably. .

It is a schematic explanatory drawing of a high temperature slag processing facility. It is explanatory drawing of the conveyance equipment of the slag which passed through the slag processing process by FIG.

Preferred embodiments of the present invention are shown below.
FIG. 1 is a schematic explanatory view of a high-temperature slag treatment facility, and FIG. 2 is an explanatory view of a slag transport facility that has undergone the slag treatment step according to FIG.

  In the present embodiment, high-temperature slag is caused to flow down from the slag pan 1 to the pit 2 to perform primary cooling first. The high-temperature slag to be treated in the present invention is steelmaking slag discharged from the furnace or pan or hot metal pretreatment slag. Desulfurization slag, etc. are included.

  In addition, although the temperature of the slag discharged | emitted from a furnace or a pan changes with kinds of slag, generally it is 1400-1600 degreeC in steelmaking slag, and is 1200-1400 degreeC in hot metal pretreatment slag.

  The structure of the pit 2 for performing the primary cooling is not particularly limited, but here, a structure in which a slab having a thickness of 0.25 m is laid on the crushed stone layer is adopted. In addition, primary cooling can also be performed using a cooling box. The hot slag is leveled on the pit 2 to a uniform thickness, and large lumps and bullion are removed. Further, cooling water is sprayed from the watering nozzle. By this primary cooling, the slag temperature is lowered to about 800 to 1250 ° C.

  Next, slag is taken out from the pit 2 with an appropriate device such as a power shovel, and secondary cooling is performed in the cooling device 10. A hopper 11 is installed in the front stage of the cooling device 10, and a grid 12 for sieving called a grizzly is provided in an inclined state on the surface thereof. The bulk metal in the slag after the primary cooling is separated by the sieving grid 12, and only the small-diameter slag that has passed through the grizzly is put into the cooling device 10 by the vibration feeder 13.

  Although various types of cooling devices 10 for secondary cooling can be used, a rotary cooler is used in this embodiment. In this case, the casing 14 is rotated around an axis that is slightly inclined with respect to a horizontal plane, and cooling air spraying means is provided therein. The slag that has reached 800 to 1250 ° C. by the primary cooling is introduced from the hopper 11 at the upper end of the casing 14 and gradually moves in the direction of the outlet 15 as the casing 14 rotates. By the secondary cooling, the slag is cooled to about 100 to 300 ° C. and discharged from the outlet 15 to the inclined conveyor 16. Further, a tripper conveyor 19 that conveys the slag to the product pit 20 is further arranged at the subsequent stage of the inclined conveyor 16.

  As shown in FIG. 2, the inclined conveyor 16 and the tripper conveyor 19 have an outlet chute 17 for discharging the conveyed slag from the conveyor.

  Since the slag cooled to about 100 to 300 ° C. by the secondary cooling has high hardness, the slag discharged from the conveyor 16 tends to be worn at a portion where the slag falls on the outlet chute 17. In the embodiment, a bowl-shaped depression that becomes the slag reservoir 18 is formed in the portion.

  The slag discharged from the conveyor 16 to the outlet chute 17 once accumulates in the slag reservoir 18 and linings the portion, and thereafter, the slag reservoir 18 that has been lined removes the slag falling from the conveyor 16. After being received, it is dropped below the outlet chute 17.

  In addition, since new slag always falls in the slag accumulation part 18, even if the slag that previously lined the part is lost, it is quickly recovered by the slag that falls next. Therefore, it is possible to maintain the state where the self-flying construction is performed stably.

  In this way, by adopting a cell flying structure that absorbs the kinetic energy of the slag falling from the conveyor 16 by the collision with the slag accumulated in the slag reservoir 18, it is caused by wear of the portion where the slag falls in the conveying process. Holes can be effectively prevented.

  In addition, since slag has the characteristic that heat conductivity is low, according to the cell flying using slag, for example, compared to the case where lining material such as refractory is applied to the falling point of the slag, the substructure that is lined The heat load on the object can also be reduced.

DESCRIPTION OF SYMBOLS 1 Slag pan 2 Pit 10 Cooling device 11 Hopper 12 Grid for sieving 13 Vibrating feeder 14 Casing 15 Outlet 16 Inclined conveyor 17 Exhaust chute 18 Slag accumulation part 19 Tripper conveyor 20 Product pit

Claims (4)

In a high-temperature slag processing apparatus used for processing high-temperature slag that primarily cools high-temperature slag and then performs secondary cooling while moving inside the cooling apparatus, a conveyor that conveys slag discharged from the outlet of the cooling apparatus; , A slag transport device comprising an outlet chute for discharging slag from the conveyor,
A slag transporting apparatus, wherein a casing serving as a slag reservoir is provided at a drop point of the slag falling into the discharge chute from the conveyor.   2. The slag conveying device according to claim 1, wherein the conveyor is an inclined conveyor that conveys slag from an outlet of a cooling device, and a tripper conveyor that conveys the slag conveyed by the inclined conveyor to a product pit.   The slag conveying device according to claim 2, wherein the high-temperature slag is steelmaking slag or hot metal pretreatment slag.   The temperature of the slag which finished primary cooling is 800-1250 degreeC, and the temperature of the slag which finished secondary cooling is 300-100 degreeC, The slag conveyance apparatus of Claim 2 characterized by the above-mentioned.

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