KR20040009070A - A multi-divided type slag pot and method for removing the skull slag therefrom - Google Patents

Abstract

PURPOSE: A multi-divided slag pot is provided in which a plural spaces are formed on the bottom portion by partitions, and a separation method for easily separating skull slag from the slag pot by cooling skull slag inside the slag pot within a short period of time is provided. CONSTITUTION: In a slag pot comprising a main body for containing slag discharged from teeming ladle utilized in continuous casting operation of the steelmaking process of refining molten iron into molten steel, the multi-divided slag pot(20) comprises a plural plates(22,24) integrally formed on the main body to partition a space for containing slag into a plural spaces, wherein the plates are formed in a tapered shape inclined from the lower side to the upper side, and the plates are fabricated in such a hollow structure that cooling space is formed between adjacent plates, an upper part of the plates is closed while a lower part of the plates is opened, and wherein the plates comprise first cylindrical plate installed at the center of the space, and a plural sheet type second plates connected between the outer surface of the first plate and the inner surface of the main body.

Description

A multi-divided type slag pot and method for removing the skull slag therefrom}

The present invention relates to a slag pot used for post-treatment of slag generated in a ladle of a steelmaking process for refining molten iron into molten steel and a method for separating slag remaining therein from the slag port. More specifically, the present invention relates to a multi-segment slag port having a plurality of spaces formed on an inner bottom surface by a partition, and a separation method in which the slag inside the slag port can be cooled in a short time and easily separated from the slag port.

In general, the steelmaking process consists of a converter process for refining molten iron from the blast furnace into molten steel from which impurities are removed and a continuous casting process for manufacturing the refined molten steel into a solid slab slab. At this time, the molten steel refined in the converter process is contained in the steel ladle to be degassed vacuum or supplied to the tundish of the continuous casting process.

Referring to FIG. 1, in which a continuous casting process is shown, molten steel 3 refined in a converter (not shown) and received at the steel ladle 1 is provided through a long nozzle 5 and an immersion nozzle 6. It is supplied to the tundish 7. The molten steel 3a in the tundish 6 is supplied to the mold 9 through the sliding nozzle. Molten steel continuously injected into the mold 9 solidifies as it passes through the mold 9 to continue producing the slab. On the other hand, when the non-metallic inclusions floating on the upper portion of the receiving ladle 1 is mixed in the tundish 7, the quality of the slab is reduced, thereby preventing the non-metallic inclusions from being mixed in the tundish 7 to prevent molten steel 3a. It is desirable to maintain the cleanliness of To this end, when a predetermined amount of molten steel is supplied from the receiving ladles 1 to the tundish 7, the supply operation is stopped, and then new supply ladles are exchanged to resume supply of the molten steel so that the molten steel continues to the tundish 7. To be supplied.

After the supply operation of the molten steel is stopped, the receiving ladles 1 are transferred to the slag trolley 13 side as shown in FIG. Then, the slag port which is loaded on the slag trolley 13 with the non-metallic inclusions (hereinafter referred to as 'slag') remaining in the course ladle 1 by activating the sovereignty 15a and the sovereignty 15b of the performance crane. Excluded by (17).

Thereafter, the slag trolley 13 is transferred to the slag yard as shown in FIG. 3, and the slag 2 now contained in the slag port 17 is discharged from the slag yard 16 for post-treatment. Now indiscriminately excluded from the slag yard, the slag 2 is naturally cooled or forced cooled and then used for investment purposes or shredded to recycle the now.

Since the inner surface of the slag port 17 generally consists of a flat or smooth surface, the slag now solidifies in the form of lumps on the inner surface of the slag port 17. Therefore, in order to recycle such a slag now, it was necessary to follow-up grinding to a predetermined size. On the other hand, now the slag cooling rate, which is accommodated in the inner surface of the slag port, is kept low, and now the slag which remains on the inner surface of the slag port after the exclusion of the slag solidifies in a fixed state, so the slag port is now removed after the slag is removed. Follow-up work was needed to reuse.

In other words, in the case of using such a simple slag port, the process of cooling, crushing, and sorting is performed to recover the current contained in the slag and recycle it, thereby increasing process logistics costs and inconvenience of recycling, and recycling. This includes cost problems in slag treatment.

Therefore, in order to solve this problem, by improving the slag port into a multi-segment form, the treatment cost of slag is now minimized, and the utilization of steelmaking waste is maximized by recycling now, and the overall process of recycling the slag is now shortened. In addition, ease of use was achieved.

For example, according to a conventional embodiment, a plurality of split blades coupled to the inner surface of the slag port and the side surface and coupled to vertically divide the slag receiving portion in the port, that is, the bottom surface, and the top surface of the split blade is cracked. Slag ports are known which are provided with hooks to be heard by. However, since the split blade is not provided integrally to the slag port, it can only be used once, and it must be lifted using a crane to remove the split blade inserted into the slag in the slag port. And, if the slag is now fused to the split wing, it is difficult to separate it.

In addition, the process of preparing the slag port is accompanied by technical difficulties that must be well put in the center of the slag in the slag port. In addition, even after the slag is stored in the slag port, the flow split blade is put into the slag port, and there is a difficulty in performing the slag in the solidified state and the thermally poor working environment.

According to another conventional embodiment, a partition plate having a grid shape for dividing the inner space of the slag port into which the slag is accommodated into a plurality is installed, and the partition plate is formed by inclined at a predetermined angle toward the bottom surface, while the partition plate and the port On the side of the structure is known that the refractory lead is built. A plurality of anchors are attached to the outer surface of the partition plate at regular intervals, and maintain a constant distance in the upper direction in contact with each other. At this time, the construction of the refractory wires on the partition plate is to minimize thermal deformation of the partition plate and also to obtain the convenience that the slag is easily separated from the slag port.

However, such a known technology has a concern that the worker enters the inside of the slag port to perform refractory construction and the worker's safety accident. And, when the refractory dropout is accompanied by a difficult problem, it is accompanied by a problem that the slag is now separated from the slag port is fused to the anchor of the partition plate during the dropping of the refractory in use. In addition to the cost of building the refractory material, the cost of the refractory use cost is derived.

On the other hand, the multi-segmented slag port must be kept in a natural air-cooled state for a period of time until the hot now slag solidifies after the slag is now transferred from the slabs. As a result of the actual test, the cooling time of the slag in the multi-segmented slag port was about 240 minutes.

At this time, if the slag is now removed from the slag port after having a short cooling time, the slag that is not completely solidified now flows into the molten state. As a result, there is a problem that now slag does not have a plural form to be broken. Then, if the slag separation is performed now after natural cooling for a long time, the problem that the slag cannot be separated from the slag port now occurs.

The present invention has been made to solve the above-described problems, and provides a multi-segment slag port provided with a cooling space so that the slag can be solidified early in contact with the surface of the partition plate installed inside the slag port. Its purpose is to.

In addition, another object of the present invention is to provide a separation method that can easily separate the slag now contained in the slag port.

Another object of the present invention is to improve the problems such as the deformation and cracking of the slag port that can be caused by long-term contact between the multi-segment slag port and the high temperature now slag, and now the slag port containing the slag to the slag yard After transporting, the present invention provides a multi-segment slag port that can shorten the time for cooling the slag and improve the circulation efficiency.

Another object of the present invention is to ensure that the slag is now well separated from the multi-segment slag port, thereby reducing the worker's work fatigue and the operational maintenance cost of treating it, and also the slag port is not separated from the slag port now. It is to prevent the disadvantages that have to be disposed of and to improve the stability of the overall work process by recycling the slag.

1 is a schematic view showing a general continuous casting process;

2 shows a state in which the slag is excluded from the slag port in the ladle;

3 is a diagram showing a state in which slag in the slag port is now excluded from the yard;

4 is a perspective view of a multi-segment slag port according to the present invention;

5 is a plan view of a multisegmented slag port according to the present invention;

6 is a cross-sectional view of a multi-segment slag port according to the present invention;

7 is a view showing a state in which slag is now contained in a multi-slag slag port according to the present invention;

8 is a cross-sectional view showing a multi-segment slag port according to another embodiment of the present invention;

9 shows the exclusion of slag now solidified from the slag port in accordance with the present invention;

FIG. 10 shows the now slag exclusion state in the yard according to the present invention; FIG.

11 is a view showing a state in which the coolant is injected into the slag port in accordance with the present invention;

12 is a view showing a state in which weight is added to the slag of the slag port now;

13A and 13B are perspective views of a weight in accordance with the present invention;

14a-14d show in sequence the method of separating slag now in accordance with the present invention.

<Description of Symbols for Major Parts of Drawings>

1: ladle

20, 40: multi-segment slag port

22, 24, 42: divider

51: coolant

60: weight

In order to achieve the above object, according to the present invention, the multi-segment slag port having a main body that receives the slag excreted from the steel slabs used in the continuous casting operation of the steelmaking process for refining molten iron to molten steel is accommodated by the slag It has a plurality of dividers integrally provided in the main body to divide the receiving space into a plurality, the divider has a tapered shape inclined from the bottom to the top, a cooling space is formed between the adjacent dividers and the top is closed And the lower portion is characterized in that it is made of an open hollow structure.

A method for separating slag now from a multisegmented slag port includes the steps of: receiving coolant in the receiving space of the slag port, discharging the now slag in molten state from the molten steel into the receiving space, and after a predetermined time Supplying a weight to the surface of the now slag that is maintained in a reaction state, and conducting the slag port after the slag is completely solidified, thereby excluding the now slag from the slag port. .

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention.

According to one embodiment of the present invention, the multi-segment slag port 20 is provided with a plurality of partition plates integrally provided to divide the receiving space in which the slag is accommodated into a plurality of divided spaces (A, B, C; see FIG. 6). (22, 24). The second dividing plate 24 is formed in a cylindrical shape extending vertically from the bottom surface in the center of the receiving space of the slag port 20 to define the second dividing space (B). The first dividing plate 22 is formed into a plate connecting the outer surface of the second dividing plate 24 and the inner surface of the slag port 20 to divide the receiving space outside the second dividing space B. The dividers 22 and 24 have a substantially same height and have a thicker taper structure as the upper part approaches the lower part.

These partition plates 22 and 24 have a hollow structure having a cooling space (s, 100b) and the top is closed to enable natural cooling or forced cooling. As a result, a plurality of grooves are formed on the lower outer surface of the slag port 20 to communicate with each other to allow ventilation. In addition, the thicknesses of the sidewalls of the slag port 20 and the thicknesses of the partition plates 22 and 24 defining the partition spaces A, B, and C are maintained to be substantially the same.

The outer surface of the slag port 20 is provided with a locking projection 26 that can be hooked to the hook (not shown). Therefore, after the crane hook is caught on the engaging protrusion 26 of the slag port 20 seated on the slag trolley 13 (see FIG. 1), the slag port 20 can be raised and lowered by the operation of the crane.

Referring again to FIG. 1, the slag 2 now remaining in the water ladle 1 after feeding the melt 3 to the tundish 7 is injected into the multisegmented slag port 20 according to the invention. do. The slag 2a, 2b, 2c (refer FIG. 7) is accommodated in each of the division spaces A, B, and C now formed by dividing the slag accommodating space by the partition plates 22 and 24. FIG. At this time, the external air is circulated along the cooling spaces s and 100b formed in the partition plates 22 and 24, and the solidification speed of the slag 2a, 2b, and 2c is now increased. That is, the slag port 20 is heated by the heat of the slag 2a, 2b, 2c, which is accommodated in the divided space of the slag port 20, and as a result, a tropical flow phenomenon occurs around the slag port 20, resulting in cooling. Since the heat exchange takes place quickly in the space s, 100b, the solidification speed of the slag 2a, 2b, 2c is now increased. Turning the slag port 20 after the slag 2a, 2b, 2c now solidifies, the slag 2a, 2b, 2c is now separated from the slag port 20 in a divided state.

According to another embodiment of the present invention, as shown in FIG. 8, the multi-segment slag port 40 now has a plurality of divider plates 42 installed radially in the receiving space of the slag. The partition plate 42 is manufactured in an inclined structure in which the thickness becomes thinner from the bottom to the top. The partition 42 has a space 42a in a sealed state. This space portion acts as a heat release path through which heat is released from the hot slag as described below. And the space part 42a maintains the thickness of the slag port 40 and the thickness of the partition board 42 which defines a division space as a whole substantially the same. On the other hand, the structure of the lower surface of the slag port 40 is kept flat unlike the lower surface structure of the slag port 20 shown in FIG.

9 and 10, the slag now accommodated in the multi-segment slag port 40 is solidified in the divided states 2a and 2b by the partition plate 42, after which the slag port 40 is solidified. When inverted, the slag 2a, 2b is now easily separated from the slag port 40.

According to another embodiment of the present invention, as shown in FIG. 11, the coolant 51 from the coolant storage box 50 to the slag port 20 before the slag is now supplied to the slag port 20 from the taps. ). Reference numeral 52 is a driving motor for operating a door (not shown) to selectively open and close the inlet 53 provided in the lower portion of the storage box 50. The coolant 51 is preferably made of iron chips or the like and now has a specific gravity greater than that of slag. This coolant 51 serves as a separator that acts so that now the slag solidified in the slag port can be easily separated from the slag port as described below, and also now acts as a weight to increase the weight of the slag. do.

In addition, according to another embodiment of the present invention, as shown in FIG. 12, the weight 60 is now slag 2a, 2b before the slag 2a, 2b is now completely solidified in the slag port 40. Put it in. The weight 60 has a head portion 62 and an extension portion 64 extending in one direction from the head portion 62 as shown in FIG. 13A, and a plurality of projections 66a to 66d on the outer surface of the extension portion. ) Is installed radially. This weight 60 is the weight that applies force in the direction of gravity to the slag 2a, 2b now when the slag port 40 is turned over after the slag 2a, 2b is now completely solidified, as described below. Act as a sieve. The projections 66a to 66d of the weight 60 act as stoppers to prevent the weight 60 from escaping from the solidified now slag.

Since the weight 60 'shown in FIG. 13B performs the same function, only the structure and thickness of the weight 60 shown in FIG. 13A and the head portion 62' are different, a detailed description thereof will be provided. Omit.

Hereinafter, a method for separating slag solidified from the slag port according to the present invention will be described with reference to FIGS. 14A to 14D, and this separation method may be applied to all other slag ports.

First, the coolant 51 is introduced into the divided space of the multisegmented slag port 40 in which the accommodation space is divided by the divider plate 42. After this, the slag is now supplied to the slag port 40 from the taps. At this time, the level of the slag is now maintained so as not to exceed the divider 42. After a predetermined time elapses, the coolant 51 is now put on top of the slag 2a, 2b now before the slag is completely solidified. Since the specific gravity of the coolant 51 is greater than the specific gravity of the slag as described above, the injected coolant 51 is lowered by its own weight and is buried in the slag now in the reaction state.

After the slag 2a, 2b is now completely solidified, the slag port 40 is turned over using a crane (not shown) to separate the solidified slag 2a, 2b from the slag port 40. At this time, the coolant 51 introduced into the slag port 40 before the presently supplied slag in the molten state acts as a separating agent to facilitate the separation of the solidified now slag 2a, 2b, The coolant 51 introduced to the top of the slag acts as a weight that adds weight to the slag 2a, 2b now solidified. As a result, the now slag solidified by the function of the separator and the weight of the coolant 51 can be easily separated from the slag port. FIG. 14D shows a state where the weight 60 is put into the slag 2a, 2b in the solid state instead of the coolant. The weight 60 acts as a weight so that the slag now solidifies with the split slag port inverted and can be easily separated from the slag port.

At this time, although not shown in the figure, the coolant 51 is introduced into the slag port before the slag is now introduced into the slag port from the taps. Then, the weight 60 can be put into the slag of the reaction state. At this time, the coolant 51 acts as a separating agent to facilitate the separation of the solidified slag 2a, 2b and the weight 60 acts as a weight.

On the other hand, now the slag solidification speed accommodated in the slag port 40 according to the present invention is accelerated by the heat release passage function of the space portion 42a provided in the partition plate 42. That is, the heat now contained in the slag is released to the space portion 42a via the partition plate 42, and as a result, the solidification speed of the slag is now improved. As described above, since the lower surface of the split slag port shown in FIG. 8 remains flat, when the slag 2a, 2b is not easily separated from the slag port 40, Force separation.

An example of the practical application of separating slag from a slag port is described as follows.

That is, according to the conventional embodiment in which the slag is now cooled by the slag pot below a certain temperature, a cooling time of about 240 minutes or more is required. And, now with relatively light specific gravity, slag tended to fall off by gravity from the inverted slag port. As a result, the slag is now not easily separated from the slag port, so a separate hammering operation was performed. However, the hammering operation now does not separate slag into lumps, but rather creates a double problem of deriving and treating the dust and dust.

However, according to the present invention, a multisegmented slag port having a partition plate having a divided space having a plurality of divided spaces in which the slag is now accommodated, and a solidification by using a coolant or a weight in the slag port Now the slag can be easily removed from the slag port. Now, about 10 to 30 minutes were required for the slag to be solidified after being removed from the partition. This is because the coolant 51 or the weight 60, which is now introduced to facilitate the separation of the slag, plays a role of weight as well as a cooling effect.

As described above, in the slag separation operation according to the present invention, the method of inputting the raw material such as the coolant and the method of utilizing the weight 60 may be applied separately or may be applied together.

Therefore, when a multi-slag slag pot according to the present invention and a working method in which the slag pot is easily separated within the port are applied to a real work, the partition plate of the multi-slag slag port is naturally cooled. Thus, cracking cases caused by thermal deformation are eliminated, and the effect of extending the service life of the slag port and reducing the maintenance cost is obtained.

In addition, unlike the known technology in which the slag cooling rate of the slag is now about 240 minutes, the raw material such as coolant is added to the slag port, thereby reducing the slag cooling time to 30 minutes or less. The benefit of maximizing efficiency is derived. In other words, the cooling speed of slag inside the slag port is now faster, so that the gap formed by thermal expansion and heat shrinkage and the gravity of slag are now increased, which greatly improves the separation efficiency of slag, and recycles slag now. The processing time is shortened.

The foregoing is merely illustrative of the preferred embodiments of the present invention and those skilled in the art to which the present invention pertains recognize that modifications and variations can be made to the present invention without departing from the spirit and gist of the invention as set forth in the appended claims. shall.

Claims (6)

In the slag port having a main body that receives the slag to be discharged from the steel ladle used in the continuous casting operation of the steelmaking process for refining molten iron to molten steel, It has a plurality of dividers provided integrally to the main body to divide the receiving space in which the slag is accommodated into a plurality, The partition plate has a tapered shape inclined from the bottom to the upper portion, a multi-segment slag port, characterized in that the cooling space is formed between the adjacent partition plate, the upper portion is closed and the lower portion is made of a hollow structure. The method of claim 1, The partition plate comprises a cylindrical first partition plate provided at the center of the receiving space, and a plurality of plate-shaped second partition plates connecting between the outer surface of the first partition plate and the inner surface of the main body. Multi-segment slag port. Receiving the coolant in the receiving space of the slag port, Discharging the now slag in molten state from the sieves in the receiving space; Supplying a weight to the surface of the now slag which is maintained in a reaction state after a predetermined time, Separating the slag port from the slag port by conducting the slag port after the slag is completely solidified. The method of claim 3, The slag separating method is characterized in that the receiving space of the slag port is divided into a plurality of divided spaces by a plurality of dividers. The method of claim 3, The slag separation method, characterized in that the coolant is made of a piece of iron heavier than the specific gravity of the slag. The method of claim 3, The slag separation method, characterized in that the weight is made of a piece of iron or weight heavier than the specific gravity of the slag.