JPH11114931A - Molding facility of slag in melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To directly obtain products by a method wherein a slag melted in a melting furnace is held at a constant temperature so as to be poured from a molten metal pouring position in each one of a plurality of molding holes provided and slowly cooled and solidified and finally pulled out of the molding hole in succession at a pulling-out position. SOLUTION: A slag S melted in a melting furnace is once introduced in a constant temperature holding tank 6 and then tapped to a rotary casting mold 8 through a tapping hole 7. Through the counterclockwise rotation of a rotary part 11 about a shaft 12 on a stationary bottom plate 13, molding holes 10 are successively shafted to a teeming position X so as to tap the slag S. The slag S in the molding hole 10 is cooled slowly and solidified during its movement on the stationary bottom plate 13. Until its reaching to a pulling- out position Y, the solidified slag S turns into a cylindrical crystallized slag product P, which is pulled downwards out of the molding hole 10 through a pulling-out hole 15. Thus, the slag can be directly turned into a product without passing through processes such as a crushing process, a grinding process, a magnetic selecting process, a classifying process or a molding process, a sintering process and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slag forming apparatus for forming a molten slag in a melting furnace for melting and solidifying municipal solid waste, industrial waste, its incineration residue, sewage sludge, and the like. Things.

[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 and solidified in a melting furnace, and are being recycled as roadbed materials, aggregates, blocks and the like. In some cases, waste is directly melted without incineration.

[0003] Various types of melting furnaces are used. For example, in a vertical melting furnace 1 as shown in Fig. 4, an object to be treated such as incineration residue and sludge is dried and conditioned to make it necessary. A briquette B is added by adding a binder according to the requirement, and the briquette B is conveyed as a raw material together with limestone L as a basicity adjuster and lump coke C as a combustion agent on a raw material conveyor 4, and a vertical melting furnace is fed from a raw material inlet 5. 1, and the preheated air is sent from the blowing tuyere 2 into the furnace, and the combustion heat of the lump coke C is applied to the furnace by 1500.
The briquette B is melted together with the limestone L by heating to a temperature of not less than ° C. The molten slag S is discharged from the tapping gutter 3 at the bottom of the vertical melting furnace 1 and then cooled and solidified.

[0004] The slag S which is 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 the slag S with water has been used for solidifying the molten slag S. The treatment is relatively simple and the cost is low, but the granulated slag obtained by the granulation process has less unevenness on the surface than the natural aggregate, the hydrophilicity is inferior, and needle-like ones are included. I have. 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. Therefore,
Recently, various types of processing equipment have been introduced to improve the characteristics of granulated slag, but their reforming is limited, and the advantage of easy processing is lost and the cost is increased. .

[0005] On the other hand, when the slag S is gradually cooled and crystallized, the physical strength is increased, and the quality standard for effectively utilizing as a civil engineering and building material such as a roadbed material, an aggregate, a block and the like is sufficiently satisfied. So, the solidified crystallized slag is crushed into crushed stone and used as roadbed material and aggregate,
The pulverized material can be mixed with cement to form a block, or can be kneaded and formed as a powder and fired to be ceramicized and used as a panel or the like.

[0006]

However, in order to commercialize the crystallized slag once solidified, it is necessary to go through various processing steps such as crushing, pulverization, magnetic separation, classification, molding, and firing. Is time-consuming, the product becomes expensive and cannot be used as a substitute for general-purpose products, and the recycling is hindered.

The present invention solves the above-mentioned problems in commercializing slag of a melting furnace. The slag of the melting furnace is solidified and formed as crystallized slag to further crush, pulverize, magnetically separate, and classify. Or a slag molding facility for a melting furnace that can be directly commercialized without going through steps such as molding and firing, thereby improving product yield, saving energy consumption, and reducing costs. The purpose is to:

[0008]

The slag forming equipment of the melting furnace of the present invention is provided with a constant temperature holding tank for holding the slag melted in the melting furnace at a constant temperature, and a plurality of mold holes having a predetermined shape. The above object is attained by providing a rotating mold that gradually cools and solidifies the slag poured into the mold hole from the constant temperature holding tank at the pouring position and sequentially removes the slag from the mold hole at the removal position.

[0009] The slag melted in the melting furnace is once introduced into a constant temperature holding tank and then discharged from the constant temperature holding tank to a rotary mold. The slag is sequentially poured into the mold hole moved to the pouring position by the rotation of the rotating mold, and gradually cooled and solidified. The solidified slag becomes a crystallized slag of a predetermined shape and is sequentially extracted from the mold hole at the extraction position. The mold hole from which the crystallized slag has been extracted and emptied is moved to the pouring position again, the slag is poured, and the above steps are repeated.

Although the slag is vitrified when quenched and its strength is reduced, the slag is gradually cooled and solidified in a rotating mold to promote crystallization and increase the strength. If the mold hole of the rotating mold is made to correspond to the shape of the product, just pull out the solidified slag from the mold hole of the rotating mold, crush it further,
Products such as civil engineering, architectural boards, panels, blocks and the like can be obtained immediately without going through steps such as pulverization, classification, molding and firing.

[0011] The constant temperature holding tank is a separation tank that separates the metal in the molten slag and taps the molten metal, so that it is possible to prevent generation of rust due to the incorporation of iron into the product, and it is not necessary to provide a magnetic separation step. .

[0012]

FIG. 1 is a structural view of a slag forming facility of a melting furnace according to an embodiment of the present invention, FIG. 2 is a plan view of a rotary mold, and FIG. 3 is a plan view of a fixed bottom plate. .

Here, the melting furnace is a cylindrical vertical melting furnace 1, and a blowing tuyere 2 is provided at a lower portion of the vertical melting furnace 1, and a raw material input for charging a raw material is provided at an upper furnace wall. A mouth 5 is provided.

The molten material D is charged into the vertical melting furnace 1 as a raw material together with limestone as a basicity adjusting agent and lump coke as a combustion agent from a raw material inlet 5, and preheated air is blown into the blowing blades. The molten product D is melted together with limestone to form slag S by sending it into the furnace from the port 2 and heating the furnace to 1500 ° C. or more by the combustion heat of the lump coke.

A constant temperature holding tank 6 is provided continuously at the bottom of the vertical melting furnace 1, and a rotating mold 8 is disposed below the tap 7 of the constant temperature holding tank 6. The constant temperature holding tank 6 includes a heat retaining means (not shown) such as a burner and a heater for holding the slag S melted in the vertical melting furnace 1 at a constant temperature, and a level sensor 9 for detecting the level of the slag S. I have.
Further, the bottom of the constant temperature holding tank 6 is inclined so as to serve as a separation tank that also functions as a tundish for separating the metal M in the molten slag S and tapping water. (Not shown) are provided.

The rotating mold 8 has a rotating part 1 in which cylindrical mold holes 10 are arranged at twelve places like a clock face in a plan view.
Reference numeral 1 denotes a copper water-cooled mold configured to rotate on a fixed bottom plate 13 about a shaft 12, and gradually cools a slag S poured into a mold hole 10 from a tap hole 7 of a constant temperature holding tank 6. A water jacket 14 for solidification is provided around the mold hole 10.

The fixed bottom plate 13 is provided with a withdrawal hole 15 at a withdrawal position Y which is rotated counterclockwise by 300 degrees from a pouring position X directly below the tap hole 7 of the constant temperature holding tank 6.

After the slag 2 melted in the melting furnace is once introduced into the thermostat 6, the slag 2 is discharged from the tap 7 of the thermostat 6 to the rotary mold 8. The rotating mold 8 moves the mold holes 10 sequentially to the pouring position X by rotating the rotating portion 11 counterclockwise on the fixed bottom plate 13 about the shaft 12, and injects the slag S into the mold holes 10 there. Hot water. The slag S in the mold hole 10 is gradually cooled and solidified while moving on the fixed bottom plate 13. The solidified slag S becomes a columnar crystallized slag product P by the time it reaches the extraction position Y, and is extracted downward from the mold hole 10 through the extraction hole 15. If a press is provided above the extraction position Y and pushed from above, the extraction operation becomes easy.

When the mold hole 10 from which the crystallized slag product P is extracted and emptied moves to the pouring position X again, the slag S is poured, and the above steps are repeated. The slag S is gradually cooled and solidified by the rotating mold 8, thereby promoting crystallization and increasing the strength. Mold hole 10 of rotating mold 8
Can be appropriately selected in accordance with the shape of an arbitrary product, and the solidified slag is simply extracted from the mold hole 10 of the rotary mold 8, and further processes such as crushing, crushing, classification, molding, and firing are performed. Products such as civil engineering, architectural boards, panels, blocks, etc. can be obtained immediately without going through.

Since the constant temperature holding tank 6 is a separation tank capable of separating the metal M in the molten slag S and discharging the molten metal, it is possible to prevent rust from being generated by mixing iron into the product P. Also, there is no need to provide a magnetic separation step. In addition, metal M
Since a large amount of hot water can be taken out at one time, it can be recycled in a mold.

[0021]

As described above, according to the slag forming equipment of the melting furnace of the present invention, the slag of the melting furnace is solidified and formed as crystallized slag, thereby further crushing, pulverizing, magnetic separation, and classification. Alternatively, a product can be directly produced without going through steps such as molding and firing. Therefore, the yield of products is improved and energy consumption is saved, so that costs can be reduced.

Further, since the constant temperature holding tank is a separation tank that separates and melts the metal in the molten slag, it is possible to prevent rust from being generated by mixing iron in the product, and it is necessary to provide a magnetic separation step. Is also gone. Since a large amount of metal can be poured at one time, it can be recycled in a mold.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a slag forming facility of a melting furnace according to an embodiment of the present invention.

FIG. 2 is a plan view of a rotating mold.

FIG. 3 is a plan view of a fixed bottom plate.

FIG. 4 is a configuration diagram of a conventional vertical melting furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical melting furnace 2 Blow tuyere 5 Raw material inlet 6 Constant temperature holding tank 7 Tap hole 8 Rotating mold 9 Level sensor 10 Mold hole 11 Rotating part 12 Shaft 13 Fixed bottom plate 14 Water jacket 15 Extraction hole D Melted material M Metal P Product S Slag X Pouring position Y Extraction position

Claims (2)

[Claims] 1. A constant temperature holding tank for holding slag melted in a melting furnace at a constant temperature, and a plurality of mold holes having a predetermined shape are provided, and slag poured into the mold hole from the constant temperature holding tank at a pouring position. Slag forming equipment for a melting furnace, which comprises: a rotary mold that gradually cools and solidifies the slag, and sequentially withdraws it from the mold hole at the extraction position. 2. The slag forming equipment of a melting furnace according to claim 1, wherein the constant temperature holding tank is a separation tank for separating the metal in the molten slag and tapping the molten metal.