JPH0235237B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is applied to a slag processing device that receives molten slag from a slag outlet, transports and cools it, and breaks it into a predetermined size. This invention relates to a dry slag device for two cupolas that is equipped with a cooling tray for receiving and cooling slag. Furthermore, the present invention is suitable for melting furnaces that continuously discharge molten slag and have a relatively small amount of slag, such as cupolas, and is also suitable for melting furnaces that are relatively large in shape, specifically tens to hundreds of cc. The present invention relates to a dry type slag processing apparatus for a cupola with two units connected to each other to form slag.

(Conventional technology) Slag discharged from a melting furnace is pulverized using a water slag treatment or a rotating disk in blast furnaces or large cupolas where a large amount of melt is produced, and is used as a raw material for cement or aggregate for civil engineering. However, although reuse is possible through slag treatment, deterioration of working conditions due to the use of slag equipment and treatment is unavoidable, and slag is usually disposed of as slag lumps in cases such as Kyupora where the amount of dissolution is small. It is. This is because when the amount of slag is small, there is little economic advantage in treating the slag with water slag and reusing it, and conversely, there are problems such as steam generation, water scattering, and equipment installation space due to slag slag treatment. This is due to the occurrence of

Therefore, in melting furnaces in which slag is not reused, such as slag treatment, the slag flowing out from the slag outlet is generally poured into a slag bucket, cooled, and then disposed of. However, the slag poured into the slag bucket is large in both weight and volume, and requires pulverization to be disposed of, so even if the slag is not intended for reuse, it is pulverized and disposed of.

On the other hand, as a slag treatment, for example,
There is a slag processing device called a pan conveyor that combines a cooling tray and an endless track, as shown in No. 109093.
Slag tends to leak from between the cooling plates due to the continuous flow of slag, and in order to inject slag into the moving cooling plate, the length of the cooling plate in the moving direction has to be lengthened, which causes the slag size to increase. In order to increase the size and slow down the running speed of the endless track, the depth of the cooling plate is increased accordingly. As the cooling plate becomes larger in this way, the diameter of the sprocket that forms the reversing portion of the endless track also becomes larger, and the device itself becomes larger.

Furthermore, there are some methods, such as those disclosed in Japanese Patent Application Laid-Open No. 53-11196, that use pallets that form continuous grooves, but in such pallet transport, the slag is stacked on the pallet and the slag is poured onto it, so that the slag is Separate supply and recovery equipment is required, and although it is suitable for large melting furnaces such as blast furnaces, it is difficult to use in small furnaces such as cupolas, and the thickness of the slag formed is uneven, and the slag is difficult to insulate. Requires special cooling means to be effective.

(Problems to be Solved by the Invention) As described above, the present invention is a slag treatment device that is not intended for direct slag treatment for reuse, and is intended to facilitate the disposal of slag or the next process treatment of slag. The objective is to achieve a slag processing device that forms slag as uniformly and as small as possible and does not degrade the working environment.Although it basically uses a conveyor system, it solves the drawbacks of the conveyor system and is relatively small. The present invention aims to achieve a dry slag treatment device for cuporas with two units connected in series, and which can appropriately control the slag size.

(Means for Solving the Problems) First, the gist of the present invention resides in a dry slag processing apparatus for a dual-unit cupola, which has the following five constituent elements as described in the claims.

(1) A cooling dish shall be provided to receive the slag flowing out from the slag outlet or the slag gutter connected to the slag outlet.

(2) An endless track with a drive shaft at least at one end is provided with cooling plates in series.

(3) Provide two slag windows at regular intervals on the upper cover.

(4) Provide protruding covers at both ends of the upper cover.

(5) Equipped with a switching means that can change the rotation of the endless track between forward and reverse directions.

(Function) In the present invention, since the slag is formed in a connected band shape, the slag supports its own weight at the cooling plate inversion part, and is configured to be bent at a predetermined length.
The width of the cooling plate and/or the cooling rate are adjusted according to the amount of slag produced to make the slag as thin as 5 to 30 mm, but in reality, the speed is set in several stages by the transmission of the drive sprocket. A switch is made. Furthermore, in order to solidify the slag in a continuous band on the cooling tray, the thickness of the bottom plate of the cooling tray that directly cools the slag is increased, and the cooling rate until solidification of the slag is adjusted to the heat capacity of the cooling tray itself. Therefore, it is necessary to control the thickness of the cooling plate, and the thickness of the cooling plate, which is usually made of steel or cast iron, is preferably 1 to 3 times the thickness of the slag.

Furthermore, since the slag is cooled by the cooling tray,
This prevents the slag from adhering to the contact surface of the slag with the cooling plate.

(Example) The present invention will be described below with reference to Examples. FIG. 1 is a front sectional view of the first embodiment of the dry slag processing apparatus for a dual cupora according to the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 4 is a partially enlarged sectional view, and FIG. 4 is a BB sectional view of FIG. 3, both of which show the first embodiment.

First, the slag conveyor 1 of the present invention is installed in front of two cupolas 81 and 82 in front of the furnace, and the upper cover 11 of the slag conveyor 1 corresponds to the slag outlets 83 and 84 of the continuous tap slag removal trough of the cupolas 81 and 82. Slag windows 181 and 182 are provided at these positions to guide the slag 90 flowing out from the slag outlet 83 to the slag conveyor. Further, although not shown, in front of the slag conveyor 1, a forehearth for the molten metal flowing out from the continuous tap slag removal trough is installed.

The slag conveyor 1 has a conveyor main body 10 assembled to a main body support 19, and drive sprockets 2 at both ends.
1 and a driven sprocket 22 are attached, and the driving sprocket is rotated by a prime mover 23 and a transmission 24 in a variable forward and reverse direction and at a variable speed. A chain, which is an endless track, is engaged with the drive sprocket 21 and the driven sprocket 22, and the cooling plate 3 is attached to the chain 4. Further, wheels 41 are attached to the chain 4 so that it can move along the upper guide 12 of the slag conveyor body. Wheels 131 are also attached to the lower guide 13 of the slag conveyor body to movably support the cooling tray 3. The cooling plate 3, which is guided and supported by the upper guide 12 and the lower guide 13 and is moved by the drive sprocket 21, has a relatively thick bottom plate 31 and an endless track, as shown in FIGS. 3 and 4. It is formed by both side plates 32, 32 parallel to the chain direction, and the adjacent bottom plates 31, 31 are closely assembled so that there is no substantial gap. A groove is formed in the track direction.

As shown in FIG. 1, the dry slag processing apparatus for a cupola with two units connected in accordance with the present invention receives the molten slag 90 flowing out from the slag outlet 83 in the cooling tray 3. To achieve this, the slag is formed in a continuous band on the cooling tray 3, and is sent in the direction of movement of the cooling tray (to the right in FIG. 1). The molten slag thus formed in a continuous band shape is conveyed by a slag conveyor and at the same time is directly cooled by a cooling tray 3 to solidify and form a band-shaped slag 9.
Then, it is sent to the reversing section 17 of the conveyor, in FIG. 1, to the driven sprocket 22 position. In this reversal section 17, the slug 9, which had been supported by the continuous cooling plate 3, is moved to the cooling plate 3 as shown in FIG.
The slag end 91 is separated from the cooling tray 3 when the conveyor starts to reverse, and as the conveyor advances, the length of the slug end 91 that is not supported by the cooling tray 3 increases, and when the slag reaches its own weight support limit, the slag end 91 breaks and the cooling tray The slag is dropped along the slag shooter 94 which is placed in the reversing section of No. 3, and is dropped into the slag bucket cart 95.
At this time, as shown in Fig. 1, by protruding both ends of the cover 11 of the slag conveyor 1 so as to cover the sprocket, the slag will come into contact with the protruding cover and break, and the cover itself will prevent the slag from scattering. It becomes possible to do so.

In this way, in the present invention, since the slag is formed into a connected band shape, the slag supports its own weight at the inversion part of the cooling plate and is bent at a predetermined length, so the slag thickness is approximately 5 to 30 mm. In order to make the cooling plate thinner, the width and/or cooling rate of the cooling plate is adjusted depending on the amount of slag, but in reality, the speed is changed over several stages by the transmission 24 of the drive sprocket. Furthermore, in order to solidify the slag in a continuous band on the cooling plate, the thickness of the cooling bottom plate that directly cools the slag is increased, and the cooling rate until the slag solidifies is determined by the heat capacity of the cooling plate itself. The thickness of the cooling plate, which is usually made of steel or cast iron, is preferably 1 to 3 times the thickness of the slag.

Furthermore, since the slag is cooled by the cooling tray,
This prevents the slag from adhering to the contact surface of the slag with the cooling plate.

In addition, as shown in FIG. 1, a gas refrigerant blower, in this embodiment an air blower 25, is provided on the upper cover 11 of the slag conveyor, and by sending cooling air to the slag conveyor main body 10, the solidified slag and cooling tray are cooled. It is desirable to increase the speed and shorten the cooling area of the slag conveyor (and thus the length of the conveyor). In addition, slag, which is glassy, usually has low adhesion to the cooling plate, and the slag and cooling plate are easily separated at the inverted part of the cooling plate, but the surface roughness of the cooling plate increases due to long-term use. Because slag may adhere to the cooling plate due to the influence of deposits, etc., the mold coating agent, specifically the blackish mold coating device 2.
6 is preferably attached to the lower guide 13 of the slag conveyor 1.

In addition, when used in a cupola as in the first embodiment, the drive sprocket is normally reversed from the state shown in FIG. 1 and the slag bucket 95 is moved to the drive sprocket side as shown in the figure in order to operate two cuporas every other day as shown in FIG. By disposing the slag on the second cupola 82, the slag is treated in exactly the same manner as described above, and by not having a special cooling means as in the present invention, It is used as a dry slag processing device for two cupolas with an extremely simple and simple structure.

The first embodiment of the present invention has been described above, but in the case of the present invention, care must be taken when assembling the cooling plate because slag leakage will occur if the bottom plates of the cooling plate are not closely spaced. By providing step portions 33 on opposing surfaces of the bottom plate 31 of the cooling plate 3 and interlocking the bottom plates, it is possible to roughen the assembly accuracy of the cooling plate 3, and also prevent thermal expansion of the cooling plate 3 and chain. Even if stretching deformation occurs, there is no risk of slag leakage. Similarly, it is preferable to provide a stepped portion 34 on the side plate 32 of the cooling tray 3 as shown in FIG. In addition, the present invention is characterized in that the continuous band-shaped slag is broken by its own weight at the reversing section of the conveyor, but as shown in FIG.
By providing the protrusion 35 that is lower than the height, the protrusion 35 of the cooling plate 3 that has entered the inverted state pushes the slug 9 in the orbital direction as it is reversed, so the glassy and brittle slag breaks at the protrusion 35 position. This makes it possible to divide the slag into slags approximately equal to the length of the cooling dish. The protrusion 35 is required to be thinner than the thickness of the slug 9, but by forming the protrusion 35 with a triangular cross section as shown in FIG. be destroyed.

In addition, it is preferable to provide such protrusions on both sides of the cooling tray in a slag conveyor that rotates in both forward and reverse directions as in the first embodiment, but since the slag tends to adhere to the cooling tray, It is preferable that a slug breaking means, specifically a breaking claw 5, be disposed on the upper cover 11 corresponding to the reversing portion 17 position, and the breaking claw 5 breaks the slug 9 sent by the conveyor. For relatively thick slugs, the breaking means may include an impact hammer that operates in accordance with the sprocket rotational speed.

Furthermore, in the case of the dry slag processing device for a dual-unit cupola according to the present invention, the slag is relatively thin (usually around 10 mm), so the slag broken at the reversing section is broken into many small pieces. Since the slag chute 94 may be caught between the cooling plates or between the sprocket and the cooling plate, it is preferable to provide a slag chute 94 as shown in FIG.

(Effects of the Invention) As described above, the dual-unit dry slag treatment equipment for cupolas of the present invention not only makes it possible to make slag into relatively small lumps, but also allows it to be used in large-scale slag processing equipment like water slag equipment. There are no problems such as steam generation or explosion caused by using water, and the work environment is improved.Furthermore, the device is relatively small, making it easy to install, and the device itself has wheels or other means of transportation. It is movable and has excellent productivity.

The dry type slag processing equipment for cuporas with two units connected in accordance with the present invention is intended as a slag processing equipment that is mainly discarded or sent to the next process of slag processing, so it is not suitable for melting furnaces such as cuporas with a relatively small melting amount. 2
It is suitable as a slag treatment device that is connected to the base.

In the present invention, slag treatment can be performed in accordance with the operation of two cupolas.

In addition, in the present invention, a slag lump having a cross-sectional area approximately equal to that of the cooling dish and a uniform thickness of around 10 mm can be stably obtained, and this slag lump is dropped into a slag bucket and further thickened to a thickness of about 5 to 20 c.c. Since it is formed into small pieces of relatively uniform size, it is easy to process when it is transported to the next process of pulverization and granulated for reuse of slag, and since the slag conveyor of this invention does not use water, it is easy to dry the slag. Not only is there no need for slag, but the cooling rate is fast, so relatively dense slag can be obtained, which is preferred as a civil engineering aggregate, and it can also be used in slag processing equipment for reuse. be.

[Brief explanation of drawings]

Figure 1: Front sectional view of the slag conveyor of the present invention, Figure 2: Enlarged sectional view taken along line A-A in Figure 1, Figure 3: 1
FIG. 4: BB sectional view of FIG. 3; FIGS. 5 to 9: sectional views of other embodiments of the present invention. Explanation of symbols 1: Slag conveyor, 21: Drive sprocket, 23: Prime mover, 25: Blower, 2
6: mold coating device, 3: cooling dish, 31: bottom plate, 32:
Side plate, 4: Chain, 83: Slag outlet, 9: Slag, 90: Slag.

Claims (1)

[Scope of Claims] 1. A cooling tray for receiving slag flowing out from a slag outlet or a slag outlet of a melting furnace, etc., and a drive shaft provided on at least one side of the cooling tray. In a dry slag manufacturing apparatus including a continuous track, the upper cover of the slag conveyor has two slag windows arranged in series at regular intervals, and both ends of the upper cover are connected to the reversing part position of the slag conveyor, respectively. A dry slag processing device for a dual unit cupora, comprising a slag conveyor in which protruding covers are formed at corresponding positions and the circulation of the endless track is variable in forward and reverse directions. 2. The above-mentioned patent claim, characterized in that the cooling tray is provided with a protruding portion that is lower in height than the side plate in a direction perpendicular to the endless track, and that at least opposing surfaces of the bottom plate are provided with stepped portions that fit into each other. A dry slag treatment device for a two-unit cupola as described on page 1.