MXPA97009474A - Deposit of power supply intended to hold a metal fused and especially an ac - Google Patents

Abstract

Feed tank for retaining a molten metal and especially a steel, whose deposit comprises a refractory bottom, refractory walls, at least one nozzle arranged in the refractory bottom to feed molten metal with at least one ingot mold, a refractory pad comprising a bottom of buffer and a substantially vertical partition defining a cavity, the buffer being disposed at the bottom of the container, on the one hand, to receive a jet of molten metal coming from a spoon that is displaced above said tank and, on the other hand , to ensure a separation of said deposit in two spaces, a first space comprising at least one nozzle, and a second space, cavity of the buffer, which relies on the molten metal, whose metal is subsequently poured, by overflowing over the partition, within the first space, characterized in that the buffer whose partition defines the second space is divided by a barrier in two. zones, an area that receives the metal jet, and a metal rise zone, located in the opposite place to the first space in relation to the

Description

Feed tank for retaining a molten metal and especially a steel DESCRIPTION OF THE INVENTION The invention relates to a feed tank intended to retain a molten metal and especially a steel, whose deposit comprises a refractory bottom, refractory walls, at least a nozzle disposed in the refractory bottom to feed molten metal to at least one spinneret, a refractory buffer comprising a bottom of buffer and a substantially vertical partition defining a cavity, the buffer being disposed at the bottom of the container, part, to receive a jet of molten metal that comes from a spoon that is displaced above said tank and, on the other hand, to ensure a separation of the contents of said tank in two spaces, a first space comprising at least one nozzle, and a second space, buffer cavity, which confines the molten metal, whose metal is then poured, by overflowing over the partition, inside the first space. The downstream processing of a steel is carried out according to a sequence using a pouring ladle, which is poured into a feed tank called distributor or distributor, the feed tank being supplied to at least one pouring mold with liquid metal. The feed tank constitutes the transfer reactor between the ladle and the cast ingot. The functions of the supply tank, or distributor, are: - to transfer the liquid metal from the ladle to the casting mold, - to distribute the liquid metal through the different rows of casting and ingot molds, - to bring the molten metal to a state not turbulent inside the mold or molds, - casting in sequence, - remove, under certain conditions, the larger inclusions contained in the liquid metal by means of the circumference, for example, of gaskets or bubbling ramps. The improvement of the operation of the feed tank is made by the use of a lining, such as, for example, an impact slab or buffer placed at the bottom of the tank, vertically under a jet protector tube located below the bucket wash. The buffer generally has as its first function that of reducing the turbulence of the liquid metal jet that leaves the ladle and enters the tank, by the degradation of the energy of the liquid metal jet that falls vertically inside the tank. In certain cases, the buffer can limit the short circuits, that is to say the periods of time after which the first fluid stream of metal leaves the tank and / or increase the residence times, ie the durations of the presence inside the tank of the fluid metal streams. The purpose of the invention is to provide a specific zone for the degradation of the energy of the incoming liquid metal jet, especially steel, and simultaneously ensure an attenuation of the turbulence of the metal jet by degradation of its energy. The object of the invention is a supply tank for retaining a molten metal and especially a steel, characterized in that the buffer whose partition defines the second space is divided by a barrier into two zones, an area receiving the metal jet, and a zone of rise of the metal, located in the place opposite to the first space in relation to the jet. The other features of the invention are: the buffer comprises at least a part of the partition that extends above the level of overflow, the barrier ensures the passage of metal flow from the area that receives the metal jet to the area of raising the metal by means of at least one upstream hole arranged in said barrier, - the upstream hole arranged in the barrier is located near the bottom of the tampon, - the buffer comprises at least one emptying orifice, the tampon is placed in contact with at least one wall of the tank in such a way that the rise zone of the metal is located in the opposite place to the first space comprising at least one nozzle, in relation to the metal jet that leaves the bucket, - the buffer is composed of a partition, a bottom and a barrier that defines a C-shaped profile, - the buffer is composed of a partition, a bottom and a barrier, in two different pieces, the separation partition forming an L-shaped profile with the bottom of the buffer, the buffer is composed of a partition and a barrier, in two different pieces, the partition having the shape of a plate. The invention also concerns a method for transferring a molten metal and especially a steel from a ladle into at least one spinneret, in which the molten metal is poured into a feed tank intended to retain the metal, The reservoir comprises a refractory bottom, refractory walls, at least one nozzle disposed in the refractory bottom to feed molten metal to at least one spinneret, a refractory pad comprising a bottom of buffer and a substantially vertical partition defining a cavity. , the buffer being arranged in the bottom of the container, on the one hand, to receive a jet of molten metal coming from a spoon that is displaced above said tank and, on the other hand, to ensure a separation of the contents of said tank in two spaces, a first space comprising at least one nozzle, and a second space, cavity of the buffer, which confines the metal, whose metal is then poured, by overflowing over the partition, into the first space, characterized in that: - the jet that comes from the spoon is moved in a direction opposite to the first space in the buffer; comprises at least one nozzle, - the jet is directed in such a way that it makes a substantially vertical rise, - the metal moves in such a way that the wave generated by the rise is directed transversely, after the overflow, towards the jet of the spoon in the direction of the first space. The following description and the appended figures, all given by way of non-limiting example, will make the invention well understood. Figure 1 is a diagram showing a sequence of the downstream processing of a steel. Figure 2 is a representation, in section, of an exemplary embodiment of a refractory pad according to the invention, placed inside a supply tank.

Figures 3, 4 and 5 are a representation, in section, of other exemplary embodiments of a refractory pad according to the invention. Figure 6 is a representation, in section, of another exemplary embodiment of a refractory pad according to the invention, associated with the walls of the tank. Figure 7 is a perspective representation of a tampon of the type of Figure 6. Figure 8 is a representation, in section, of another embodiment of a refractory pad according to the invention, associated with the walls of the tank. Figure 9 is a perspective representation of the tampon of Figure 8. Figure 10 is another perspective representation of the tampon of Figure 9. In the downstream processing of a metal, especially a steel, as depicted in figure 1, a ladle 1 is fed to a feed tank 2, also known as distributor or distributor, pouring the feed tank 2 to the liquid metal 3 in one or more rows of casting into one or more casting molds 4 . The metal feed tank 2 comprises a refractory bottom 5, refractory walls 6 designed to retain the molten metal inside the feed tank 2, at least one nozzle 7 arranged in the refractory bottom 5 that evacuates, by circulation, to the molten metal from the reservoir 2. A refractory pad 8, comprising a cavity 9, is placed in the bottom 5 of the reservoir 2. It is intended to receive a jet 10 of molten metal coming from the spoon 1 which is displaced above the tank 2. In a first form of the invention, within the field of steelmaking, as shown in Figure 2, the cavity 9 of the buffer 8, represented in section in a plane comprising the longitudinal axis of the hole 20, is formed by a buffer bottom 11 and a partition 12 substantially vertical. The buffer is disposed on the bottom 5 of the tank, on the one hand, to receive a jet 10 of molten steel coming from the spoon 1, which is displaced above said tank 2 and, on the other hand, to ensure a separation of said tank 2 in two spaces, a first space 13 comprising at least one nozzle, and a second space, cavity 9 of the buffer 11, which borders the molten steel, whose steel is then poured by overflowing the partition 12, inside the space 13. The buffer allows, by confining the steel inside the cavity 9, that is to say the second space, breaking the initial energy of the flow of the steel entering the tank and then directing the molten steel towards the surface, over the entire width of the deposit. The buffer limits, for this reason, the turbulence of the incoming steel jet, by the degradation of its energy. The buffer 8 is a piece of refractory concrete, which can be monolithic, placed in the bottom 5 of the tank and arranged in the vertical of the jet protection tube 10 of the ladle 1. According to a feature of the invention, the buffer 11, whose partition 12 defines the second space, is divided into two zones by a barrier 14, an area 15 that receives the jet 10 of steel, and a zone 16 for raising the metal, located at the opposite place of the first space 13 relative to the jet 10. The barrier 14 ensures the passage of the steel flow from the zone 15 to the rise zone 16 of said steel by means of at least one upstream hole 19 passing through to the barrier 14. The rise hole 19 of the barrier 14 is located near the bottom 11 of the tampon. The buffer guides the flow of the incoming metal in a movement as represented by the arrow A. The buffer comprises, perforated in the partition 12, at least one emptying hole 20 which ensures, on the one hand, a circulation of the steel by the bottom 5 of the space 13 of the tank, especially before the overflow of the steel filling the buffer 8 and, on the other hand, a recess of the space 9 of the buffer at the end of a casting. As shown in Figure 3, the tampon, represented in section in the plane containing the horizontal axis of the hole 20, comprises at least a part 17 of partition 12 extending above the overflow level of the tampon. The partition part 17 of the buffer 11 placed in the steel raising zone 16, which sends the steel in the direction of the space 13, can be inclined in such a way that the steel rise is facilitated, as shown in figure 4 The buffer can have any geometric shape depending on the shape of the deposit. It is, preferably, parallelepiped.

The tampon according to the invention that has just been described above, concerns a monolithic tampon that can be placed in any type of deposit, without limitation of form. The steel contained in the spaces that can exist externally between the walls 6 of the tank and the partitions 12 of the buffer can circulate around the periphery of said buffer. In a preferred form of the invention, as shown in FIG. 5, the pad 11 assumes, in part, the shape of at least one wall 6 of the tank 2 so that the rise zone 16 of the steel is located in the place opposite the first space 13 comprising at least one nozzle, in relation to the steel jet 10 at the exit of the spoon 1. Keeping the same principle, it is possible to associate the partition 12 of the buffer with the walls 6 of the tank, forming the walls 6 of the reservoir, in part, the cavity of the buffer 11, the area 15 that receives the steel jet and the rise zone 16 of the steel. In this form of the invention, the tampon shown in Figure 6 is composed of a partition 21, a bottom 22, and a barrier 23 defining a C-shaped profile. The area 16 is disposed between a wall portion 6 of the reservoir and barrier 23 of the tampon. The tampon is represented in a general manner, in perspective, in figure 7. As shown in this figure, the tampon can carry on the partition 21 a flange 24 extending horizontally towards the area 15. The flange 24 can terminate by a Caedizo border 25 that closes on itself the steel flow of space 15.

In another form of the invention, represented in FIGS. 8 and 9, the tampon is composed of a partition 26, a barrier 27 and a bottom 28, in two different pieces, the partition 29 forming a profile in L with a buffer bottom 28. The bottom 22 and / or 28 constitutes a relatively important reserve of refractory material, whose reserve alleviates the wear subsequent to the violent impact of the incoming molten steel jet, in particular when opening the spoon 1. When the bottom 5 of the tank can supporting the impact of the steel jet exiting the ladle, the buffer essentially consists of a partition 26 and a barrier 27, the bottom 22, 28 being able to be suppressed. Otherwise, as shown in FIG. 10 , the bottom 11, 22, 28 comprises, in the area receiving the metal jet, a wear mass 29 comprising at least one inclined canvas. The purpose of the inclined canvas is to orient the metal jet towards the barrier 14 and towards the upstream hole 19 which passes through the barrier 14. The inclined canvas can have a face of particular shape, such as flat, concave or convex The proposed tank, provided with the buffer according to the invention optimizes the reduction of the turbulence of the liquid steel in the impact zone of the tank thanks to the creation of zones with strong energy degradations. Orient the incoming metal flow to the surface and in the opposite direction to the feed nozzles of the casting rows. It also optimizes the short-circuit time and the dwell times, which improves the cleanliness of the processed steel. The tampon may be located in an end portion of a reservoir, when this reservoir has the general shape of an elongated parallelepiped. When the tank has the general shape called T, the nozzles are aligned in the first space that is the bar of the T. The tampon is then placed in the part perpendicular to the bar of the T, with the jet of molten steel coming from of the ladle oriented in the direction opposite to the first space, and after its rise, displaced in such a way that the wave formed is oriented towards the ladle jet or cut transversely to the ladle jet in the direction towards the first space, according to be the procedure of the invention.

It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention. Having described the invention as above, property is claimed as contained in the following:

Claims (9)

1. REVIN ICA? IQWES 1.-Feeding reservoir for retaining a molten metal and especially a steel, whose deposit comprises a refractory bottom, refractory walls, at least one nozzle disposed in the refractory bottom to feed molten metal to at least one ingot mold , a refractory pad comprising a bottom of buffer and a substantially vertical partition defining a cavity, the pad being disposed at the bottom of the container, on the one hand, to receive a jet of "molten metal that comes from a spoon that is displaced above said deposit and, on the other hand, to ensure a separation of said deposit in two spaces, a first space comprising at least one nozzle, and a second space, cavity of the buffer, which confines the molten metal, whose metal is then pour, by overflow over the partition, into the first space, characterized in that the buffer whose partition defines the second space is divided It is formed by a barrier in two zones, an area that receives the metal jet, and a metal rise zone, located in the opposite place to the first space in relation to the jet.
2. 2. Tank according to claim 1, characterized in that the buffer comprises at least one part of the partition that extends above the level of overflow.
3. 3. Tank according to claim 1, characterized in that the barrier ensures the passage of metal flow from the area receiving the metal jet to the metal rise zone by means of at least one upstream hole disposed in said barrier.
4. 4. Tank according to claim 3, characterized in that the rising hole arranged in the barrier is located near the bottom of the tampon.
5. 5. Tank according to claims 1 to 4, characterized in that the buffer comprises at least one emptying orifice.
6. 6. Tank according to claims 1 to 5, characterized in that the tampon is brought into contact with at least one wall of the tank in such a way that the rise zone of the metal is located in the opposite place to the first space comprising at least one nozzle, in relation to the metal jet that comes out of the spoon.
7. 7. Tank according to claims 1 to 6, characterized in that the buffer is composed of a separation partition, a bottom and a barrier defining a profile in the form of C.
8. 8. - Deposit according to claims 1 to 6, characterized in that the buffer is composed of a separating partition, a bottom and a barrier, in two separate pieces, the separating partition forming an L-shaped profile with the bottom of the buffer,
9. 9.- Procedure for transferring a molten metal and especially a steel from a ladle to at least one row of casting, in which the molten metal is poured into a feed tank intended to retain the metal, whose deposit comprises a refractive-river bottom, refractory walls, minus one nozzle disposed in the refractory bottom to feed molten metal to at least one spinneret, a refractory buffer comprising a bottom of buffer and a substantially vertical partition defining a cavity. ad, the buffer being disposed at the bottom of the container, on the one hand, to receive a jet of molten metal coming from a spoon that is displaced above said tank and, on the other hand, to ensure a separation of the content of said tank. deposit in two spaces, a first space comprising at least one nozzle, and a second space, cavity of the buffer, which confines the metal, whose metal is then poured, by overflowing over the partition, into the first space, characterized in that: - the jet coming from the ladle is displaced inside the buffer so that it is oriented in a direction opposite to the first space comprising at least one nozzle, - the jet is directed in such a way that it makes an appreciably vertical rise, - the metal is displaced in such a way that the wave generated by the rise is directed transversely, after the overflow, towards the jet of the spoon in the direction of the first space.