JPS5815715B2 - Molten slag supply method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and an apparatus for supplying molten slag from a slag storage pot to processing equipment when processing molten slag that is a by-product of metal processing.

It is generally known that when metals are smelted, slag is produced as a byproduct.

However, most of the slag has traditionally been discarded or used for reclamation in landfills.
In recent years, there has been a call for effective use of slag, and in response to this, various techniques for treating and processing slag in a molten state have been provided, and efforts have been made to increase the added value of slag.

By the way, when processing the molten slag (hereinafter simply referred to as slag, but in cases where there is no need to distinguish between the molten state and the solidified state, it is simply referred to as slag), the slag is Processing equipment in the invention is a general term for equipment for processing and treating slag).
Stably supplying the required amount at any time is the most basic, yet most important and difficult problem.

In other words, the fluidity of slag is extremely sensitive to temperature changes, and the heat of fusion is small, making it easy to solidify. will immediately become blocked and become unable to be supplied.

Therefore, in the past, measures were taken to keep the molten slag warm in the slag supply section, so that the slag could be easily supplied each time it was needed, and to prevent the supply port from being blocked by solidification of the slag during supply. Install a game if equipped with a heating device such as a heater,
It is common practice to install processing equipment capable of handling large changes in the amount of slag supplied, and methods for controlling the flow rate of slag during supply are at best as shown in Figure 1. As shown, a plate-like flow rate regulating plate 2 was installed in the slag feed trough 1.

However, the conventional method requires large processing equipment that is unbalanced with respect to the amount of slag that can be processed, resulting in poor equipment efficiency.
Equipment costs are also high, and installation of a gate with a heating device requires a large-capacity heater to prevent solidification of the slag, making the equipment complex and increasing running costs.

Furthermore, the flow rate control method shown in Figure 1 is effective for restricting the flow rate for a short time when an abnormally large amount of slag is received, but as mentioned above, it is possible to stably supply a fixed amount of slag. It is extremely difficult to do so.

In order to fundamentally solve the problems in the conventional methods, the present invention actively utilizes the properties of slag and provides a method and apparatus for stably supplying slag to subsequent processing equipment with simple operations. The purpose is to provide the following: (1) A flow prevention plate is attached to the tip of the slag supply gutter for a set period of time, and a solidified layer of molten slag is formed at the tip of the slag feed gutter. After
A method for supplying slag, characterized in that a slag supply port is opened in the solidified layer.

(2) A slag supply device characterized in that a flow prevention plate having an arbitrarily shaped insulating material fixed to the inner surface in a protruding manner is attached to the tip of a slag supply gutter provided in a slag storage pot so as to be openable and closable.

It is in.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be explained in detail based on figures showing embodiments.

FIG. 2 is an overall configuration diagram showing an embodiment of the present invention.

In the figure, 3 is a slag storage pot for storing molten slag, and 1.4 is a gutter for supplying slag generated in a metallurgical furnace (not shown) such as a blast furnace or a steelmaking furnace to the slag storage pot 3.

The slag storage pot 3 is provided with a slag feed gutter 1a and an overflow gutter 5, and the slag stored in the slag storage pot 3 flows out from the supply port 6 of the slag feed gutter 1a and is supplied to the processing equipment 1.

The slag supply gutter 1a in this embodiment is provided in a protruding manner on the lower side surface of the slag storage pot 3, and has a refractory lining layer 8 on its inner surface, as shown in FIG. 3, a partially enlarged cross-sectional view.

The molten slag in the slag storage pot 3 is prevented from flowing out by attaching an outflow prevention plate 9 to the tip of the slag supply gutter 1a, and the slag is kept stored in the slag storage pot 3.

Further, when the slag is supplied to the processing equipment 1, this is done by removing the outflow prevention plate 9.

By the way, as the molten slag comes into contact with the outflow prevention plate 9, the temperature of the slag in the vicinity of the contact area with the outflow prevention plate 9 decreases over time, and a solidified layer 10 is formed as shown by diagonal lines in FIG. .

The present invention makes active and effective use of the coagulated layer 10.

That is, the present inventors have repeatedly conducted various experiments and as a result of repeated studies, the thickness of the coagulated layer 10 is determined by the material used as the outflow prevention plate 9 and the amount of heat retained by the outflow prevention plate 9 itself.

Furthermore, it has been devised that the thickness can vary depending on the contact time between the slag and the outflow prevention plate 9, and conversely, the thickness can be consciously and arbitrarily adjusted.

For example, the outflow prevention plate 9 is made of a material with high thermal conductivity like a steel plate.
If it is made of a material with high heat dissipation properties, a relatively thick solidified layer 10 can be formed in a short time.

On the other hand, as shown in Fig. 4, the spill prevention plate 9ak is made of a heat insulating material with high heat insulation and heat retention, or as shown in Fig. 5, it is made of wood or a secondary product of the wood, such as paper or fiber, or even glass. In the outflow prevention plate 9b formed by fixing or lining the inner surface of the iron plate 9bt with a heat insulating material 11a such as fiber or dried or preheated fireproofing material with well-known bolts 12, a thin coagulated layer 10a can be formed even for a relatively long time. Become.

If the coagulated layer 10 is formed and shaken, the slag will not easily flow out even if the outflow prevention plate 9 is removed because of the coagulated layer 10.

Therefore, in order to supply the molten slag to the processing equipment 7, first remove the outflow prevention plate 9, and then apply it to the coagulation layer 10 by any means.
By opening the supply port 6, the slag starts flowing out from the slag storage pot 3 and is supplied to the processing equipment 7.

When the coagulated layer 10 is thin, the hole can be easily opened in the coagulated layer 10 by lightly hitting it with a well-known hammer or the like or by applying a slight impact such as poking with a protrusion rod. In extreme cases, the solidified layer 10 may be opened so as to be destroyed by the impact when the outflow prevention plate 9 is removed.

In the case of this thin coagulated layer 10a, the opened supply port 6 has almost the same size as the inner surface opening of the slag feed gutter 1a, and the outflow prevention plate 9 either allows the slag to flow out from the slag storage pot 3 or prevents it from flowing out. This occurs when the outflow prevention plate 9a or 9b having the insulating material 11 on the inner surface or the outflow prevention plate 9 is attached for a very short time as described above. be.

In this example, wood was used as the heat insulating material 11, but the wood was carbonized and carbonized when it came into contact with the molten slag, and while the area near the contact surface with the slag became dense, the inside became porous, preventing leakage. When the prevention plate 9 is removed, the releasability of the coagulation layer 10 and the spill prevention plate 9 (hereinafter referred to as floating property) is long, and the heat retention is very excellent, so the spill prevention plate 9 can be kept attached for a long time. However, the coagulated layer 10 was prevented from becoming thicker, and in that sense, it was very effective.

On the other hand, if the solidified layer 10 is thick, holes may be made mechanically with a well-known drill or the like, or a protruding metal piece 13 may be welded to the inner surface of the outflow prevention plate 9c as shown in FIG. 6 to prevent outflow. The holes may be opened by a method such as simultaneously opening the supply port 6a using the pulling force when removing the plate 9c.

Therefore, when the coagulation layer 10 is thick, a supply port 6a of any shape and size can be opened regardless of the internal opening of the slag supply gutter 1a, and the supply port 6a has very excellent heat retention. The coagulated layer 10 of the molten slag is formed as an inner wall, and the relationship between the size of the supply port 6a and the heat dissipation surface area of the coagulated layer 10 is determined as follows: If the amount of heat given to the coagulated layer 10 through the inner wall of 10 and the supply port 6a is made equal, the supply port 6a will not become large or small, and will always be kept constant, allowing for stable quantitative supply. Can continue.

As explained above, by combining the type of the outflow prevention plate 9 and the attachment time, the coagulated layer 10 having an arbitrary thickness can be formed at the tip of the slag feed gutter 1a.

Accordingly, in the present invention, the supply state required by the processing equipment 7, for example, when the frequency of stopping the supply of slag is high or low,
In addition, depending on the degree of demand, such as when it is necessary to change the supply amount of slag, that is, the flow rate of slag, when a very stable constant supply is required, or on the other hand, when flow control is not strictly required. The thickness of the coagulated layer 10 to be formed and the size of the supply port 6 are determined, the optimal outflow prevention plate 9 is appropriately selected, and the required coagulation layer 1 is determined according to the outflow prevention plate 9.
The thickness of the coagulated layer 10 and the supply port 6 are obtained by attaching the outflow prevention plate 9 to the tip of the slag feed gutter 1a for a time that can form a thickness of 0, that is, a set time referred to in the present invention. Solidified layer 1 formed at the tip of the slag 1a
As mentioned above, the number 0 includes holes so thin that they are punched by the impact when removing the outflow prevention plate 9, and those so thick that they must be punched with a drill.

Now, FIG. 1 is a partial sectional view of the tip of a slag feed trough 1a showing another embodiment based on the present invention, particularly an embodiment falling under claim 2.

In the figure, the spill prevention plate 9d is attached to the tip of the slag feed gutter 1a so as to be openable and closable, and the inner surface of the spill prevention plate 9 is provided with a heat insulating material 11.
b is fixed in the shape of a protrusion.

Therefore, the coagulated layer 10b formed on the inner surface of the outflow prevention plate 9d, that is, the tip of the slag feed gutter 1a, has a thin coagulated layer 10b1 on the inner surface that is in contact with the heat insulating material 11b, and is in contact with the other outflow prevention plate 9d. The inner surface becomes a thick coagulated layer 10b2, and when the outflow prevention plate 9d is removed or opened, holes can be easily opened by applying an impact such as poking the thin coagulated layer 10b1 with a protrusion rod as described above.

In this embodiment, the effect of the present invention was made more remarkable by using wood as the heat insulating material 11b, as in the insulating material 11 of the previous embodiment, but the heat insulating material 11b had good floating properties, In addition, it is not limited to just wood, but can also be used as long as it has excellent heat insulation and heat retention properties, that is, it has a porous structure with many pores inside and has a dense structure on one surface. Of course, there is no problem with the next processed product, glass fiber, synthetic resin, or even sufficiently dried amorphous or shaped refractories.Furthermore, grease that carbonizes at high temperature can be simply applied to the surface of the heat insulating material with high heat insulation and heat retention properties. It is also possible to use a material that improves the above-mentioned floating property by coating with a material such as a material such as a material.

The shape of the heat insulating material 11b determines the shape and size of the supply port 6 formed in the solidified layer 10, and is not limited to a simple circular or square shape, for example, as shown in FIG.
The heat insulating material 11c may have a wide slit shape, the heat insulating material 11d may have a semicircular shape as shown in FIG.
The insulation material may be arbitrarily selected, such as using a pyramid-shaped heat insulating material as shown in FIG.

At this time, the sizes of the heat insulating materials 11b to 11e are as described above.
The amount of heat released from the coagulated layer 10b and the molten slag form the coagulated layer 10b.
The shape and size of the supply port 6 can always be kept constant if the supply port 6 is determined so that the amount of heat given to the two is equal to each other.

In addition, the slag feed trough 1a is relatively small, and the heat dissipation surface area of the coagulated layer 10 is smaller than the size of the supply port 6, which disrupts the heat balance between heat dissipation and heat input of the coagulated layer 10, and the supply port 6 becomes wider. If there is a risk, as shown in Figure 11,
At the tip of the slag feeder 1a, a nozzle 14 or a heat dissipating fin (not shown), which is made of a material having high heat dissipation properties, such as an iron plate, and enclosing the heat insulating materials 11b to 11e is installed in advance, and the nozzle 14 or the heat dissipating fin forms a solidified layer. By taking measures to adjust the amount of heat released from the heat sink 10, it is possible to fully exhibit the above effects.

Now, the heat insulating materials 11b to 11e are fixed to the inner surface of the outflow prevention plate 9d in a protruding manner, and the means for fixing them is limited to the impact and molten slag generated when the insulating materials 11b to 11e open and close the outflow prevention plate 9d. In addition to bolting as shown in FIG. 7, it may be fixed using well-known adhesives, studs, etc., as long as it does not easily fall off due to fluid pressure or the like.

As shown in FIG. 7, in the embodiment of the heat insulating material 11b made of wood, the wood is charcoalized, so when the outflow prevention plate 9d is opened, the insulating material 11b disintegrates and partially adheres inside the coagulated layer 10b. However, as mentioned above, the charcoal has excellent peeling properties, so the charcoal in the adhesive state can be easily removed by lightly poking it with a protrusion rod, etc. There will be little impact on drilling operations.

In such a case, any fixing means may be used as long as it can withstand the impact when the outflow prevention plate 9d is attached and the flow pressure of the slag.

Fixation in the present invention is used in this sense.

Now, the outflow prevention plate 9d having the heat insulating materials 11b to 11e is attached to the tip of the slag feed gutter 1a so as to be openable and closable.
As shown in FIG.
A holding fitting 16f: is installed on the tip surface of the slag supply gutter 1a, and the outflow prevention plate 9 is slidably installed in the holding fitting 16, or the outflow prevention plate 9a is tightened and fixed with a cotter 17 as shown in FIG. This is a general term for mounting means that can be easily opened/closed or attached/detached to/from the outflow prevention plate 9d' due to its structure.

As explained above, the present invention prevents the slag flowing out from the slag feed gutter 1a71x by damming it with the outflow prevention plate 9.
A coagulated layer 10 of arbitrary thickness is formed at the tip of the molten slag, and the coagulated layer 10 is actively and effectively used to open a supply port 6 of an arbitrary shape and size to stabilize the molten slag. It is now possible to supply extremely stable quantitative amounts with simple operations, and the biggest conventional problem in processing slag has been fundamentally solved.

In addition, the slag supply gutter 1 in the present invention protrudes from the side surface of the slag storage pot 3,
It is not limited to the slag supply gutter 1a of the above embodiment having the refractory lining layer 8, but for example, a slag storage pan 3a as shown in FIG.
Even if the slag feed gutter 1b is simply opened on the bottom surface 3at of the slag feed gutter 1b, or the semicircular gutter 4 whose upper half is open as shown in FIG. The refractory lining layer 8 may be omitted.

That is, in the slag trough 1 without the refractory lining layer 8, the molten slag solidifies in a relatively thick layer on the inner surface of the slag trough 1, forming a heat insulating layer.

Further, regarding the slag storage pot 3, a metallurgical furnace such as a blast furnace or a steelmaking furnace is assumed to be the slag storage pot 3, and a gutter 4 fixedly installed in the metallurgical furnace shown in FIG. Of course, it is also possible to attach a leakage prevention plate to the tip, and this can be very effective in some cases.

As described above, according to the present invention, the treatment of slag has become significantly easier, the range of uses of slag has been greatly expanded, and the added value of slag has become extremely high.

As described above, the practical and industrial effects of the present invention are very large.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of a conventional slag supply device, Figs. 2 to 12 show an embodiment based on the present invention, and Fig. 2 is an overall configuration diagram; Figure 3 - Figure 4, Figure 6, Figure 7, and Figure 11 are a partial sectional view and perspective view of the slag supply gutter, Figure 5 is a perspective view showing one embodiment of the outflow prevention plate, and Figure 8
Figures 1 to 10 are perspective views showing examples of the heat insulating material. In the figure, 1, 1a, and 1b are the slag supply gutter, 2 is the flow rate adjustment plate, and 3
, 3a is a slag storage pot, 4 is a gutter, 5 is an overflow gutter, 6,
6a is a supply port, 1 is a processing equipment, 8 is a refractory lining layer,
9, 9a-9b are outflow prevention plates, 10.10 a, 10
b is a coagulated layer, 11° 11a to 11b are heat insulating materials, 12 is a bolt, 13 is open hole hardware, 14 is a nozzle, 15 is a hinge,
16 is a time keeping metal fitting, and 11 is a cotter.

Claims (1)

[Scope of Claims] 1. A flow prevention plate is attached to the tip of a slag supply gutter for a set time, and a solidified layer of molten slag is formed at the tip of the slag feed gutter, and then a molten slag supply port is installed in the solidified layer. A method for painting fusuma on molten slag, which is characterized by opening holes. 2. A molten slag supply device, characterized in that an outflow prevention plate having a heat insulating material of an arbitrary shape fixed to the inner surface in a protruding manner is attached to the tip of a slag supply gutter provided in a slag storage pot so as to be openable and closable.