JPH11118133A - Ladle for slug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To crush slug to sizes small enough to be charged into a crusher when the slug is discharged from the ladle. SOLUTION: A protrusion 10 for promotion of a crush of slug is formed on an inner surface 71 of a bottom plate 7 of a ladle 6 for slug to receive molten slug supplied from the molten slug tap spout of a melt furnace and to cool and solidify the slug. The slug tapped from a molten slug tap spout is supplied in the ladle 6 and cooled and solidified. In this case, cracks are generated in the internal part of the slug by the protrusion 10 for promoting crush of the slug, and when the slug is discharged from the ladle 6 and caused to fall because of its weight, through an impact on dropping, the slug is crushed to a suitable size enough to be charged into the crusher.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slag for cooling and solidifying molten slag discharged from a melting furnace for melting incineration residues such as municipal waste and industrial waste, sewage sludge, and the like. It is about a pot.

[0002]

2. Description of the Related Art Generally, municipal waste and industrial waste are often incinerated. The incineration residue whose volume has been reduced by incineration has been landfilled. However, as it becomes increasingly difficult to secure landfill sites, incineration residues are melted in a melting furnace, cooled and solidified, and recycled as roadbed materials, aggregates, blocks, and the like.

[0003] Various types of melting furnaces are used. For example, in a vertical melting furnace 1 as shown in Fig. 3, an object to be treated such as incineration residue and sludge is dried and conditioned to make it necessary. A binder is added accordingly to form a briquette B, which is conveyed together with limestone L as a basicity adjuster and lump coke C as a combustion agent by a raw material conveyor 4 and loaded into a vertical melting furnace 1 from a raw material inlet 5. The briquette B is melted together with the limestone L by feeding the preheated air into the furnace from the blowing tuyere 2 and heating the furnace with the combustion heat of the lump coke C. The molten slag S is discharged from a tapping gutter 3 at the bottom of the vertical melting furnace 1.

[0004] The slag discharged at a high temperature becomes vitreous when rapidly cooled, but can be converted into a crystallized slag having a crystal structure by controlling the cooling temperature.
Conventionally, a granulation process of rapidly cooling slag with water has been used for solidification of molten slag. The treatment is relatively simple and the cost is low, but the granulated slag obtained by the granulation is brittle because it is vitreous,
Compared with natural aggregate, the surface has less irregularities, is less hydrophilic, and includes needle-like materials. Therefore, when used as civil engineering and building materials with great demand, their compaction properties and bonding strength with cement, asphalt, etc. are poor, and recycling is not advanced.

On the other hand, when the slag is placed in a ladle and gradually cooled and crystallized, the slag has the same strength as natural stone,
Since the quality standards for effective use as aggregates, blocks, etc., civil engineering and construction materials are fully satisfied, the solidified crystallized slag can be crushed into crushed stone and used as roadbed material, aggregate, or crushed. The resulting material can be mixed with cement and molded to form a block, or can be kneaded and molded as a powder and fired to be ceramicized and used as a panel or the like.

[0006]

In order to commercialize slag cooled and solidified in a ladle as roadbed material and aggregate, it is necessary to discharge,
It is necessary to go through various processing steps such as crushing, magnetic separation, and classification.

[0007] As a method of discharging the solidified slag from the ladle, it is easiest to tilt or tip the ladle with a crane or the like and drop the slag from the ladle by its own weight.
However, when the slag is dropped by its own weight and discharged from the ladle, if the ladle is large, the slag becomes a large lump and it is difficult to put it into the crusher in the next crushing step. Therefore,
Rough crushing is required before the slag is put into a crusher, but the crystallization slag has a large strength and the work of coarsely crushing the slag is troublesome.

If the ladle is made smaller, the discharged slag can be made smaller. However, when there is a large amount of molten material, the ladle must be replaced frequently, which complicates the operation and increases the efficiency of one ladle. As the amount of heat of slag per unit decreases,
It is rapidly cooled by the outside air and crystallization is difficult to proceed.
In this case, it is conceivable to maintain the temperature of the ladle by means such as providing a thermostat in order to promote crystallization, but equipment costs and running costs increase.

The present invention solves the above problem in a slag ladle for cooling and solidifying by receiving slag from a melting furnace. When the solidified slag is discharged from the ladle, the slag is removed. It is an object of the present invention to provide a ladle for slag which can be made to have a size suitable for being put into a crusher simply by dropping it from a ladle.

[0010]

SUMMARY OF THE INVENTION A slag ladle according to the present invention is a ladle for receiving molten slag discharged from a tapping gutter of a melting furnace and cooling and solidifying the molten slag. The above problem is solved by forming a projection for use.

The slag discharged from the tapping gutter at the bottom of the melting furnace enters the ladle and is cooled and solidified. At this time, cracks are formed inside the slag by the slag crushing promotion projections formed on the inner surface of the ladle. Generated. Therefore, if the slag is dropped by its own weight when the slag is discharged from the ladle, the slag can be crushed into a lump having a size suitable for being put into the crusher by the impact of the drop.

[0012]

FIG. 1 is a plan view of a ladle for slag showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG.

The ladle 6 for slag is composed of a bottom plate 7 having a substantially square shape and four side plates 8 having an inverted trapezoidal shape. The upper edge of the side plate 8 has a ladle for moving the ladle 6 and discharging the slag. A lifting hand 9 for lifting the pan 6 is attached.

On the inner surface 7I of the bottom plate 7 of the ladle 6, there is formed a slag crushing acceleration projection 10 having a mountain-like cross section in a cross shape in plan view. The number and position of the slag crushing promoting projections 10 can be appropriately selected as needed, and can be provided on the inner surface 8I of the side plate 8. The shape can also be selected as appropriate, such as a cone or a pyramid, or a combination thereof.

When the ladle 6 is used in, for example, the vertical melting furnace 1 shown in FIG. 3, the molten metal slag S discharged from the tapping gutter 3 of the vertical melting furnace 1 is received. It is arranged below.

The melted products such as incineration residues and sludge are dried and conditioned to obtain a briquette B by adding a binder if necessary. Limestone L is a basicity adjuster, and lump coke C is a burner.
At the same time, the raw material is conveyed by a raw material conveyor 4 as a raw material, and is charged into a vertical melting furnace 1 from a raw material inlet 5. Vertical melting furnace 1
When the raw material is charged into the inside, the preheated air is
From the furnace, the heat of combustion of the lump coke C
The briquette B is melted together with the limestone L by being heated to 0 ° C. or more. The molten slag S is discharged from the tapping gutter 3 at the bottom of the vertical melting furnace 1 and poured into the ladle 6.

The slag S discharged from the tapping trough 3 at the bottom of the vertical melting furnace 1 enters the ladle 6 and is cooled and solidified. At this time, the slag S is formed on the inner surface 7I of the bottom plate 7 of the ladle 6. Cracks are generated inside the slag S by the slag crushing promotion projections 10 that are present.

When the solidified slag S is to be discharged from the ladle 6, the ladle 6 is lifted up by a crane or the like using the lifting hand 9 and tilted or turned over. Since the ladle 6 has the side plate 8 extending upward, the slag S easily falls under its own weight and is discharged from the ladle 6 if it is turned over. Since the slag S is internally cracked by the slag crushing acceleration projection 10, the slag S is crushed into a lump having a size suitable for being put into the crusher only by the impact at the time of falling. Therefore, it is not necessary to roughly crush the slag S before putting it into the crusher.

[0019]

As described above, the slag ladle of the present invention has a slag crushing promotion projection formed on the inner surface of a ladle, which is usually a flat surface, and generates cracks inside the slag, so that the slag is solidified. When the slag is discharged from the ladle, the slag can be made to have a size suitable for being introduced into the crusher simply by dropping the slag from the ladle, and the coarse crushing of the slag before being introduced into the crusher becomes unnecessary.

[Brief description of the drawings]

FIG. 1 is a plan view of a ladle for slag showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a configuration diagram of a conventional vertical melting furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical melting furnace 2 Blow tuyere 3 Hot tapping gutter 4 Raw material conveyor 5 Raw material charging port 6 Ladle 7 Bottom plate 7I Inner surface 8 Side plate 8I Inner surface 9 Hanger 10 Slug crushing promotion projection S Slag

Claims (1)

[Claims] 1. A ladle for receiving molten slag from a tapping gutter of a melting furnace to cool and solidify the molten slag, wherein a slag crushing acceleration projection is formed on an inner surface of the ladle. pot.