RU2288280C1 - Method of acting on chemical composition of molten steel and equipment complex for realization of this method - Google Patents

Abstract

FIELD: metallurgy; methods of acting on chemical composition of molten steel.

SUBSTANCE: proposed method includes tapping of molten metal from metal melting reservoir into ladle through taphole, transfer of melt flow through passage made from refractory material and delivery of elements into metal having effect on its composition. Length of said passage is lesser than length of metal flow and its cross-section is equal to 1.3-1.4 of cross-section of metal flow; elements are delivered in ground and/or granulated form at passage inlet over its perimeter and in its height. Equipment complex proposed for realization of this method includes metal melting reservoir with taphole, ladle, passage for transfer of molten metal from metal melting reservoir into ladle whose working part is made from refractory material. Passage for transfer of molten metal from metal melting reservoir to ladle is mounted vertically and coaxially relative to taphole of metal melting reservoir; devices for delivery of elements changing the chemical composition of molten metal are mounted on several sections of said passage over its perimeter and in height; device for feeding elements in ground form is mounted in height of passage. Proposed method makes it possible to feed deoxidizing agents and/or desulfurizing agents in ground or granulated form into flow of metal, thus accelerating the process of homogenizing of chemical composition of steel in ladle.

EFFECT: enhanced efficiency; enhanced ecological conditions in working zones.

10 cl, 14 dwg, 3 ex

Description

The invention relates to ferrous metallurgy, more specifically to the production of steel. At the same time, it can be used in non-ferrous metallurgy.

A known method of influencing the chemical composition of liquid steel, including preparing steel in a metal-smelting tank and pouring it through an outlet from the main tank into an intermediate tank, feeding elements into the steel that change its chemical composition when it is in the metal-smelting tank and during the pouring process (see e.g. VS 4632368A, B 22 D 11/118, 11/14, 12/30/1986).

The known method has significant disadvantages:

- firstly, the supply of elements in molten steel, changing its chemical composition, is carried out using a glass, which complicates the application of the method for influencing the chemical composition of steel in the ladle;

- secondly, there are significant losses of deoxidizers and alloying elements.

A known method of influencing the chemical composition of molten steel in a ladle, which includes pouring molten steel from a metal smelter through an outlet into a ladle and supplying alloying elements and / or deoxidizers to the steel. Moreover, the supply of elements is carried out in the capacity of the steel ladle from above by: 1) injection of powdered materials; 2) immersion in the thickness of the metal of special capsules filled with powder materials; 3) by mechanized feeding of elements pressed into a tube of low-alloy steel tape and others (see, for example, V.I. Yavoysky et al. “Metallurgy of steel”: Textbook for high schools. M: Metallurgy, 1983, p. 322).

This widely known method of influencing the chemical composition of steel in the ladle is, according to the essential features, the closest to the proposed one, therefore it is taken as a prototype.

The known method has significant disadvantages.

Firstly, only a part of the elements supplied to liquid steel (especially aluminum, calcium, rare-earth metals, alkali metal oxide, etc.) is involved in the processing of steel, since a significant part of them evaporates (burns out).

Secondly, the implementation of the method requires intensive processing of liquid steel in the ladle by blowing gas in order to ensure uniform processing of steel in volume.

Thirdly, the possibility of organizing the production of small batches of steel billets in large metallurgy, when the mass of steel in the ladle can reach 300 tons, is excluded.

Fourth, the environmental situation in the area of steel processing in the ladle is deteriorating due to dust formation and combustion of the supplied elements.

The proposed method of influencing the chemical composition of molten steel in a ladle is free from these drawbacks. It solves the problem of uniform and economical supply of alloying elements and / or deoxidizers together with inert gas to liquid steel. A technical result is achieved in the production of small batches of steel in large metallurgy, thus expanding the technological capabilities for obtaining billets of different chemical composition. Improving environmental conditions when feeding elements into steel.

These technical results are obtained due to the fact that in the proposed method for influencing the chemical composition of liquid steel, liquid metal is discharged from the metal-smelting vessel through an outlet into the ladle, overflow of the metal flow through the channel from the refractory material and supplying elements affecting the chemical composition to the metal stream metal.

The length of the channel is less than the length of the metal stream, and its cross section is 1.3-1.4 of the cross section of the metal stream, while the supply of elements in a crushed and / or granular form is carried out at the entrance to the channel along its perimeter and along its height. The supply of elements as deoxidizers and / or desulfurizers and / or modifiers is carried out in conjunction with a neutral or inert gas. The supply of elements is carried out forcibly. The supply of elements is carried out by injecting gas. The supply of elements is carried out by a screw. The element supply areas are changed, during which time the metal transfusion process is stopped and the bucket is replaced.

For the effective implementation of the proposed method, it is important to ensure a uniform distribution of the elements supplied to the steel in the volume of liquid metal in the ladle, which is implemented using the proposed complex metal melting capacity - ladle.

A known complex is a steelmaking capacity — a ladle containing a metal-smelting vessel (for example, an open-hearth furnace) with an outlet and a ladle (see, for example, Fig. VII. 9 on page 536 of the specified textbook by V.I. Yavoysky and others).

According to the essential features, this main complex of steelmaking is closest to the proposed one, therefore it is taken as a prototype.

The known complex is characterized by significant disadvantages analyzed in the description of the known method. The noted drawbacks lead to the need for an additional operation: flushing liquid steel in the ladle with an inert or neutral gas (see, for example, Fig. 2.1. On page 102 in the book "Processes of continuous casting of steel / Monograph. A. Smirnov and others. - Donetsk: DonNTU. 2002).

The proposed complex metal-smelting capacity - the bucket is free from the disadvantages of the known complex. It solved the problem of feeding elements into the liquid metal that affect the chemical composition of the metal in the ladle, with their uniform distribution in the volume (deoxidizing agents, desulfurizers and modifying elements) of the metal in the ladle when these elements (deoxidizing agents, alloying and other elements) are economically used.

Obtaining the indicated technical results in the proposed complex is ensured due to the fact that the metal-smelting vessel-bucket complex for influencing the chemical composition of liquid steel contains a metal-smelting vessel with an outlet, a ladle, a channel for overflowing liquid metal from the metal-melting vessel into the ladle, the working part of which is made of refractory material, and devices for feeding elements into the liquid metal stream in a crushed and / or granular form, changing the chemical composition of the metal. The channel for overflowing liquid metal from the metal-smelting vessel into the ladle is installed vertically, coaxially with the outlet of the metal-smelting vessel, and devices for supplying elements that change the chemical composition of the metal into the liquid metal stream are located in several sections of the channel at the inlet along its perimeter and in height, this device for feeding elements into the liquid metal stream in a crushed form is installed along the height of the channel. The working part of the channel is made of graphite. The channel consists of a conical and cylindrical parts, while the conical part is the entrance to the channel and the angle of inclination of the conical surface from the vertical is at most equal to 30 °. The device for feeding elements into the liquid metal stream as deoxidizers and / or desulfurizers and / or modifiers in powdered form is made with the possibility of joint supply with a neutral or inert gas.

The method of influencing the chemical composition of liquid steel, the complex for its implementation is illustrated by the drawings in figures 1-14.

Figure 1 shows (schematically) a complex of metal-smelting capacity - a ladle for implementing the method; figure 2 - section aa in figure 1, figure 3 - a complex of metal-smelting capacity - a ladle for implementing the method on an open-hearth furnace; figure 4 is a section aa in figure 3; figure 5 shows the supply of elements to the metal auger; in Fig.6 is a section aa in Fig.1 in the case of the supply of elements to the metal at the beginning of the entrance to the channel in several sections along its perimeter; Fig.7 is a section aa in Fig.5 in the case of supplying elements to the metal at several sites along the height and perimeter of the channel; Fig. 8 shows a device self-aligning with respect to an outlet turned to drain a metal-smelting vessel, ensuring alignment of the longitudinal axes of the outlet and the channel; Fig.9 is a section aa in Fig.8; 10 and 11 show the location of the device and the drive for moving it outside the working area of the metal-smelting vessel (converter); on Fig shows the joint of the carrier and channel-containing (removable) parts of the device; in Fig.13 - the implementation of the removable canal-containing part of the device; on Fig scheme testing method in laboratory conditions on a cold model.

The metal-smelting tank 1 (open-hearth furnace, arc steel-smelting furnace, converter, induction furnace, etc.) is filled with liquid metal 2 (Figs. 1, 3, 8). The tank 1 contains an outlet 3 through which liquid metal in the form of a stream (jet) 4 enters a bucket 5 mounted on a trolley 6 with the ability to move to / from the tank 1. During the transfusion of the liquid metal 2 from the tank 1 to the bucket 5, a stream is formed (jet) 4, characterized (for the jet) with a diameter d _p and a length L _p , which is a variable. With regard to the transfusion of liquid metal 2 from the capacity of the open-hearth furnace 1 (Fig.3) in the process of transfusion of metal, a stream 4 with sizes B _p and H _p in Fig. 4 is formed. Between the tank 1 and the bucket 5, a channel 7 is installed, the length of which is l _k , the inner diameter is d _k (Figs. 1, 2, 5 - 7, 13, 14 and 15); in the case of an open-hearth furnace, channel 7 is used with dimensions B _k = B _p , height H _k > H _p and length l _k (FIGS. 3 and 4).

During the transfusion, the liquid metal in the form of stream 4 moves along the path 77; the longitudinal axis of the channel 7 in the figures is designated K. The path of the flow 77 and the longitudinal axis of the channel K are identical and, in most cases, coaxial. The exception is the open-hearth furnace-ladle complex, when the flow path 77 and the longitudinal axis of channel K are identical, but not coaxial (Fig. 4).

на большинстве фигур и В_к·Н_к на фиг.4) несколько превышает сечение струи

или потока (В_п·Н_п) соответственно. Отмеченное превышение составляет 1,3...1,4. При меньшем превышении возрастает вероятность частого контакта потока (струи) металла с поверхностью канала, что нежелательно, т.к. нарушает равномерное падение (движение) металла в потоке после выхода из канала 7, тем самым увеличивается разбрызгивание металла после выхода из канала. При большем превышении заметно уменьшается затягивание подаваемого инертного или нейтрального газа в зазор поток металла - канал, а при свободной подаче элементов ухудшается их перемешивание и внедрение в поток металла.Cross section of channel 7 (

in most figures and B _to · N _to figure 4) slightly exceeds the cross section of the jet

or stream (In _p · N _p ), respectively. The marked excess is 1.3 ... 1.4. With a smaller excess, the probability of frequent contact of the metal stream (jet) with the channel surface increases, which is undesirable, because violates the uniform drop (movement) of the metal in the stream after exiting the channel 7, thereby increasing the spatter of the metal after exiting the channel. With a large excess, the retraction of the supplied inert or neutral gas into the gap is markedly reduced, the metal flow is the channel, and when the elements are freely supplied, their mixing and penetration into the metal flow is worsened.

.The length of the channel l _{k is} less than the smallest size of the length of the stream l _p , which eliminates the possibility of frequent contact of the surface of the channel 7 with the stream 4 of molten metal 2. The preferred length l _to approximately

.

Deoxidizers, desulfurizers and modifying elements are fed into channel 7 through a pipe (channel) 8. The fraction of the supplied elements can be different: from fine powder to granules. These elements may be supplied separately or together. The supply of elements can be free: falling under the action of its own weight vertically, along an inclined line with a corresponding slope (figure 3). The supply of elements can be forced: by injecting gas through the pipe (Fig. 1), by using the screw 9 (Fig. 5), by any other means of forced feeding of bulk materials. In most types of feed elements use a neutral or inert gas. In this case, gas can be supplied separately from the elements, but more often the supply of gas and elements is combined, i.e. use a single channel of input into the stream of liquid metal.

For feeding the elements, the system (Fig. 1) is mainly used, comprising a pipeline 8, a container 10 filled with powder and / or granules from the supplied elements. With a movable device for supplying elements using flexible pipes (hoses) 8. An inert or neutral gas is supplied to the container 10 through the pipe 11, the flow rate of which is controlled by the device 12, and the pressure by the device 13; the flow rate of the supplied elements is controlled by the dispenser 14 (when using several containers - personal for each container).

The pipe 8 can be brought to the inlet of the metal stream 4 into the channel 7 (figure 1). The pipe 8 can be brought into the body 15 of the channel 7, but closer to the entrance to the channel 7 (figure 5). In this case, the supply of elements can be from one pipe 8, connected to the channel 7, but also use the supply of elements in several sections of the channel 7, for example, three around the perimeter at the beginning of the entrance to channel 7 (Fig.6) or three in height perimeter (Fig.7), but closer to the entrance to channel 7.

The body 15 of the channel 7 is made of refractory material. Most preferably, the use of graphite as this material, eliminating the sticking of liquid metal to the inner surface of the channel 7. In the body 15, the channel 7 is made of conical and cylindrical parts (Fig.13), while the angle of inclination (from the vertical) of the conical surface generally does not exceed 30 °, because at large angles, there is the possibility of individual cases of the rebound of falling parts of the metal in the stream 4 outside the body 15. In relation to the release of metal from the open-hearth furnace, channel 7 is formed by covering the outlet chute 16 with body 15 made of refractory material and supporting structure (Figs. 3 and 4).

Thus, for feeding the elements into the metal stream 4, a device containing a channel 7 is used, the working part of which is made of refractory material, preferably graphite. The device is made of a supporting part 16 (Fig. 12) and a channel-containing part 15. The channel-containing part 15 is replaceable. The device is arranged to be located (during metal transfusion) between the outlet 3 of the metal melting vessel 1 and the bucket 5, and with the indicated arrangement of the device, the longitudinal axis 18 of the outlet 3 and the longitudinal axis K of the channel 7 coincide, i.e. arranged coaxially. To fulfill this condition, the device is equipped with the possibility of self-installation and / or movement drive. The device can be mounted on a metal-smelting tank 1 (figure 3).

In any case, the execution of the device eliminates its negative impact on the work with metal smelting capacity 1, including in the maintenance of the outlet 3.

For self-installation of a device with a channel-containing part, the carrier part 16 of the device is fixed on the housing of the container 1 (for example, chipboard) pivotally 17, so that when the container 1 for metal is rotated, the carrier part 16 of the device also rotates, so that the longitudinal axis K of channel 7 is aligned with the longitudinal the axis 18 of the outlet 3 (Fig.8 and 9).

To install the device with the channel-containing part 15 during the release of metal between the outlet 3 of the metal-smelting tank 1 (converter) and the bucket 5 (FIGS. 10 and 11), the device is equipped with a drive. Drive options may be different, but in any case, their execution, the drive and the device are not located in the working area of the metal-smelting tank 1 until the tank is brought into the position of the release of molten metal. Also, in any case, the drive must ensure the coincidence of the longitudinal axis of the channel 7 (axis K) and the trajectory of the flow of metal 4 before the metal is released, i.e. axis P.

The drive of the device can be made (Fig. 10), for example, in the form of a rack 16 (it is the supporting structure 16 of the device) and a drive for moving it in the form of a gear 19 having a drive from the engine 20. In this case, the rollers 21 are the support of the rack 16. figure 10 in solid lines shows the position of the device inoperative, the dotted line in the working position.

The drive of the device can be performed (Fig. 11), for example, in the form of a Chebyshev four-link 22 (Fig. 11) and its corresponding drive (conditionally not shown in Fig. 11).

Other types of device drives are possible when fulfilling the requirements already described for them in terms of application and device location.

The metal-smelting tank 1 in the form of a chipboard (Figs. 8 and 9) and a converter (Figs. 10 and 11) contain an axis 23 and a mechanism for turning the tank 1 about this axis during the process of transferring metal from the tank 1 to the bucket 5.

The method of influencing the chemical composition of liquid metal in the bucket is as follows.

Get liquid metal 2 in the tank 1 (figure 1, open-hearth furnace in figure 2, chipboard in figure 3 and 4, the converter in figure 10 and 11). The metal 2 is prepared for release from the tank 1 into the bucket 2 through the outlet 3. In relation to the chipboard and the converter, the tank is rotated about the axis 23.

In the gap between the tank 1 and the bucket 5, a device with a channel 7 is introduced (as applied to the open-hearth furnace in FIG. 2, channel 1 is formed by the upper part 15 mounted above the outlet trough 16 or permanently mounted above it). The axis K of the channel 7 and the axis 18 of the outlet 3 are aligned. In this case, a self-installation of the supporting structure 16 of the device is used (Figs. 8 and 9) or a movement drive of the supporting structure 16, similar to that shown in Figs. 10 and 11 and when describing these figures.

Open the hole 3 and metal 2 in the form of a stream (stream) 4 rushes down into the bucket 5 along the path of P. The path of P and the axis K are identical and in most cases coaxial. When implementing the method on open-hearth furnaces, it is difficult to ensure the alignment of the trajectory P and the K axis (see Fig. 4), but in this case, the implementation of the method is strict alignment and optional, their identity is sufficient.

After approximately 10 ... 15 tons of metal is found in the bucket 5 (the latter depends on the parameters of the tank 1 and the corresponding size of the bucket 5), deoxidizers and / or desulfurizers are fed from the container 10 using the batcher 14 through the pipe 8 to the metal stream 4 and / or modifying elements.

The feed is carried out by free fall, including along an inclined line (FIG. 3), gas injection (FIG. 1), screw 9 (FIG. 5), or other method. In each case of the production process, the most convenient way of feeding the elements towards the metal flow 4 is selected. The supply of elements towards the metal flow 4 is accompanied by the supply of an inert or neutral gas. In some cases, especially when feeding the elements in a granular state, by injection of an inert or neutral gas supplied through the pipe 11 and controlled by devices 12 and 13 (Fig. 1), the supplied elements are given an increased speed, which ensures the introduction of elements (granules) into the metal.

Strictly speaking, when implementing the method, it is desirable to supply an inert or neutral gas along with the supply of elements. But it is possible to implement the method without gas or air.

The preference for using an inert or neutral gas is due to the increasing protection of the metal from these gases from oxidation. The latter is due, firstly, to the phenomenon of drawing these gases into the gap between the stream 4 and the surface of the channel 7 and the coverage of these gases by the stream; secondly, the ingress of part of the gas into the metal stream and with it into the bucket 5. Both of the noted effects occur during the implementation of the method and improve the quality of the metal in the bucket. The already indicated excess of the dimensions of the channel 7 over the dimensions of the stream 4 provides the described phenomena when implementing the method.

Based on the simplicity of the technical implementation of the method, the supply of elements to the metal is carried out at the inlet of the metal stream 4 into the channel 7 (Fig. 1). In addition, the presence of a conical part at the entrance to the channel 7 and the already described phenomenon of drawing gas flows into the gap between the stream 4 and the surface of the channel 7 are used.

However, they also supply elements to the metal stream in different places along the height of the channel 7 (its bearing part 15), see Figs. 5 and 7. The expediency of using such a supply of elements to the metal stream 4 can be due to purely constructive considerations (the location of the complex is capacity 1 - bucket 5). However, the preference for such a supply of elements to the metal stream 4 occurs when using elements in a finely dispersed state, when the supply of elements at the inlet to channel 7 leads to substantial dusting of this section of the complex, to additional losses of the supplied elements.

The implementation of the method does not exclude the simultaneous use of the described options for supplying elements to the metal stream 4: part - at the entrance to the channel 7, another part - departing from the entrance to the channel in the direction of the metal flow.

The implementation of the method provides for the possibility of supplying elements at the beginning of the entrance to the channel 7 along its perimeter (Fig.6) or along the height and perimeter of the channel (Fig.7). Thereby, the separation of the feed elements into stream 4 is realized.

Moreover, by the implementation of the described supply of elements in several sections of channel 7, the production of small chemical batches of different steel in large metallurgy is carried out. In this case, the supply system is equipped with several containers 10 and the parts and assemblies 8, 10-14 providing them to work (Fig. 1), in each container their dosage amount and content of elements are formed. Containers 10 work in turn, with a break in work. During this break, the metal transfusion process is stopped, for example, by turning the container 1 relative to the axis 23, the bucket 5 is updated with the bucket 5, then the container 1 is turned into the state of metal transfusion 2 in the bucket 5 and the elements are fed into the metal stream 4 from another container 10. Meanwhile in each bucket, a small batch of liquid steel of various chemical composition in large metallurgy is formed. Naturally, the implementation of the described technology requires the presence in the steelmaking shop along with ladles of increased capacity of ladles of smaller capacity.

Thus, a method for influencing the chemical composition of liquid steel and a complex for its implementation at an early stage of casting is proposed: before the metal enters the ladle, elements (deoxidizing agents, desulfurizers, and other modifying elements) that change the chemical composition of steel in the ladle are fed into the liquid metal stream. The flow of this metal stream into the bucket reinforces the phenomenon of mixing of these elements with liquid metal, which accelerates the process of homogenization of the chemical composition of steel in the volume of the bucket. An important technical aspect of the proposed method is the reduction of losses of elements supplied to the metal, which along with the increase in economic indicators improves the environmental conditions at the site of supply of these elements to steel. The technological capabilities of metal production are expanding due to the creation of conditions for obtaining small batches of steel of various chemical composition in large metallurgy.

Example 1. In the cold model (Fig. 14), the metal-smelting vessel imitated vessel 1, the bucket - vessel 5. Vessel 1 had an outlet 3 closed by a plug (not shown conditionally in Fig. 14). A supporting structure 16 was attached to the vessel 1, on which a channel-containing body 15 with a channel 7 was installed. The longitudinal axis 18 of the hole 3 and the axis K of channel 7 were coaxial. Channel 7 is made with a conical (inlet) and cylindrical parts. An inclined pipe 8 'was brought to the entrance to the channel 7, in the upper part of which a container 10' was installed. Bulk material 24 '(tinted salt, sawdust) was poured into a 10' container. The container 10 'is equipped with a stopper 25' with a handle that allows you to open (close) the flow of bulk material into the vessel 5 (see arrows).

Water 2 was poured into vessel 1, the cork was opened, and the water flow fell down into vessel 5 in the form of a jet 4, which was passed inside the channel 7. In this case, the axis K of channel 7 and the path of incidence of jet P coincided. After filling approximately the fourth part of the vessel 5, the stopper 25 'was opened and the bulk material 24' through the pipe 8 'was fed into the stream 4 of water at the beginning of the channel 7.

In the volume of the vessel 5 received uniformly tinted water. With a similar filling of vessel 5 with water from vessel 1 (but without passing a stream of water 4 through channel 7) and supplying the same bulk material to vessel 5 during its filling with water, by the end of the water transfusion process, a noticeably more uneven tint of water in the volume of vessel 5 was observed.

Example 2. Under similar conditions to Example 1 (Fig. 14), gas 26 was used to supply bulk material 24 "from container 10" into pipe 8 "and from it into water stream 4, which was supplied to container 10" after opening of plug 25 ". Got a similar pattern of example 1, the distribution of the dye in the volume of water in the vessel 5.

Example 3. On the chipboard, designed to produce about 100 tons of steel during one heat and equipped with an outlet located in the bay window, after turning the furnace, a body 15 with a channel 7 was installed through which a stream of steel from the chipboard into the ladle was passed. In channel 7, at its beginning, aluminum shot was fed in an amount of 160 kg for 80 seconds. The pressure of the injected air was 6 bar at the inlet and about 2.0 bar near the channel 7. The feed rate of aluminum shot into the metal stream reached 2.0 ... 2.5 m / s. The fraction had a fraction of ⌀ 1.0 ... 5.0 mm with a predominant size of ⌀ 1.0 ... 2.0 mm. The results were compared with the accepted technology for supplying aluminum in the form of ingots weighing 10 ... 11 kg. The consumption of the main alloying elements in both cases was at the same level.

Obtained at almost the same degree of steel deoxidation in the ladle, the aluminum consumption by the existing technology is 1.48 kg / t, using the proposed method at the level of 1.17 kg / t, i.e. aluminum consumption decreased by 0.31 kg / t.

Claims (10)

1. A method of influencing the chemical composition of liquid steel, including the release of molten metal from a metal smelter through an outlet into a ladle, overflowing a metal stream through a channel from refractory material and supplying elements into the metal stream that affect the chemical composition of the metal, characterized in that the length of the channel less than the length of the metal stream, and its cross section is 1.3-1.4 of the cross section of the metal stream, while the supply of elements in a crushed and / or granular form is carried out at the entrance to the channel along perimeter and height. 2. The method according to claim 1, characterized in that the supply of elements as deoxidizers, and / or desulfurizers, and / or modifiers is carried out together with a neutral or inert gas. 3. The method according to claim 1, characterized in that the supply of elements is carried out forcibly. 4. The method according to claim 1, characterized in that the supply of elements is carried out by injecting gas. 5. The method according to claim 1, characterized in that the supply of elements is carried out by a screw. 6. The method according to claim 1, characterized in that the change of the supply areas of the elements is carried out, during which the metal transfusion process is stopped and the bucket is replaced. 7. Complex metal-smelting capacity - a bucket for influencing the chemical composition of liquid steel, containing a metal-smelting vessel with an outlet, a bucket, a channel for overflowing liquid metal from a metal-smelting vessel into a bucket, the working part of which is made of refractory material, and a device for feeding into a liquid stream metal elements in crushed and / or granular form, changing the chemical composition of the metal, characterized in that the channel for overflowing liquid metal from the metal melting tank into the bucket is installed and coaxially with the outlet of the metal-smelting vessel, and devices for supplying elements that change the chemical composition of the metal into the liquid metal stream are located in several sections of the said channel at the inlet along its perimeter and in height, while the device for supplying elements to the liquid metal stream crushed form is installed along the height of the channel. 8. The complex according to claim 7, characterized in that the working part of the channel is made of graphite. 9. The complex according to claim 7, characterized in that the channel consists of a conical and cylindrical parts, while the conical part is the entrance to the channel and the angle of inclination of the conical surface from the vertical is at most equal to 30 °. 10. The complex according to claim 7, characterized in that the device for feeding elements into the liquid metal stream as deoxidizers, and / or desulfurizers, and / or modifiers in ground form is made with the possibility of joint supply with a neutral or inert gas.

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