CN1985011A - Method and installation for producing and increasing the annual production yield of large-scale steel products or high-quality steel products in a two-vessel installation - Google Patents

Abstract

The invention relates to a method and an installation for the large-scale production of steel products or the production of high-quality, different steel products in a two-vessel installation (1), said method and installation improving the crude steel yield for a melting bath depth (15) of approximately 1,000 mm to 1,800 mm. According to the invention, the buoyancy plumes (14a) of the porous bottom plugs (14) are adjusted to within a respective minimum distance (16) of 2/3 in relation to the edge of the melting bath (17) and to a distance (18) of 1/3 in relation to the centre of the melting bath (19) with a blowing angle of alpha = 15 DEG to 40 DEG for the nozzles (6b) of an oxygen top-blowing lance (6) in relation to the vertical and the buoyancy plumes (14a) are formed with a maximum 2 Nm<3> of argon or nitrogen per minute and per porous bottom plug (14).

Description

Method and plant for producing ordinary or high-quality steel of different qualities in a double vessel plant and increasing its annual output

technical field

The invention relates to a method and a plant for the production of ordinary or premium steels of different qualities using a double vessel plant (Zwei-Gefβ-Anlage) comprising a process for the introduction or withdrawal The turning and lifting device of the unit, wherein the furnace type of the furnace lining is designed according to the favorable flow conditions of molten steel and/or slag, in such a way that the arrangement in the bottom of the lower furnace is equipped with bottom blowing bricks (Bodenspülstein), which are arranged according to the oxygen top blowing The interaction between the jet and the upshooting free jet of the bottom blown brick is determined.

Background technique

From "Stahl und Eisen" 123 (2003) Nr. 11, pp. 94-98, the method referred to in the foregoing remarks and a similar device are known. The measures taken there involved optimizing the geometry of the vessel, although implementing this optimization did not lead to better results in terms of the quality of steel produced. No attention has been paid to producing a completely different steel quality, increasing the annual production of steel and using dual vessel systems.

Contents of the invention

The object of the present invention is to significantly increase the steel production per unit time for selectable steel qualities in an existing double vessel plant by strengthening the process and by coordinating the individual vessels and their dimensions until approximately doubling the steel production.

Proposed object is set out from the method described in the foreword, adopts following measures to reach according to the present invention, that is, under the situation of about 1000mm to 1800mm of molten pool depth, in the blowing angle α of the nozzle of oxygen top blowing lance relative to vertical line = 15° to 40°, the free jet flow of the blowing brick at the bottom is adjusted to reach the edge of the molten pool within a minimum distance of 2/3 and to the center of the molten pool with a distance of 1/3, and the upper The flushing free jet consists of argon or nitrogen max. 2 Nm ³ per minute and per bottom flushing brick. Therefore, the refining process of larger volumes of molten steel is significantly accelerated, so that more raw steel can be produced per unit time.

A measure to support the basic idea consists in additionally blowing in oxygen in the refining stage at an angle of 5° to 45° relative to the horizontal via side-blowing lances inserted under the slag. Therefore, it is helpful to stir the large-volume molten steel thoroughly.

According to another measure, both containers are simultaneously operated with oxygen. The advantage of the resulting second oxygen top-blowing lance is that the blowing phases are switched on simultaneously in both containers or alternately as a pure oxygen top-blowing process depending on the preparation of direct reduced iron or pig iron and/or steel scrap for each container. This possibility of use occurs, for example, when the weight ratio of directly reduced iron to pig iron exceeds 60/40% or 40/60%.

Larger molten steel volumes are considered according to other features, namely, at a minimum bath depth of about 1000 mm to 1800 mm, oxygen is blown in at 100-500 Nm ³ /min through an oxygen top-blowing lance.

The plant for producing higher yields of steel proceeds from the features stated in the introduction, and the measures taken to achieve the proposed object according to the invention are that the lower furnace has a molten pool depth of approximately 1000 mm to 1800 mm; when the arrangement is substantially circular At the same time, the bottom blowing bricks are set to the edge of the molten pool within a minimum distance of 2/3 and to the center of the molten pool with a distance of 1/3; the blowing angle of the nozzle of the oxygen top blowing lance relative to the vertical line α= 15°-40°, and the upstroke free jet operates at a maximum of 2Nm ³ argon or oxygen per minute and per bottom blow brick.

Measures can be taken to achieve a greater increase in volume, ie an increased bath depth is formed by means of a punched bowl bottom or a one-piece punched bowl bottom connected to the container bottom. This increases the possible bath depth by the height of the punched bowl bottom.

Other features are that the second oxygen top-blowing lance is mounted on an additional, separate swivel and lift device on a swivel-in and swivel-out radius outside the central axis. When the two oxygen top blowing lances are transferred to the working position, the arc electrode system can be turned back to the parking position in the space between the two containers. Advantageously, the second oxygen top blowing lance blows air simultaneously in the two containers, and alternately implements pure BOF process or EAF process in each furnace according to the preparation of direct reduced pig iron, pig iron and/or scrap iron. This feature is advantageous if eg the DRJ/pig iron ratio exceeds 60/40 or 40/60%.

Due to the increased oxygen supply and due to the greater energy simultaneously generated by the intensification of the stirring gas from the bottom blowing brick and the side blowing lance, the following measures can be taken to absorb further, that is, the upper furnace connected to the lower furnace is made of a cooled copper shell, The cold plate, the copper wall, the refractory wall and/or the liquid cooling tubes are formed without gap distances.

Accordingly, according to another feature, the side-blowing lances distributed along the furnace circumference pass through the corresponding wall of the upper furnace.

It is also advantageous if the side-blowing lance passing through the slag door is designed as a consumable side-blowing lance. Thus the refractory wall prevents excessive wear and in addition can increase the electrical power from the usual 100-110MW to 120-140MW.

In addition to the advantages of using the swivel and liftable oxygen top-blowing lance and the arc electrode system on both sides, this double-container system has been further developed in that different steel qualities can be produced in a single vessel. The measures taken to achieve this purpose are that, for C-steel, the lower furnace is provided with an eccentric bottom tapping hole for slag-free tapping. In this case the slag remains in the lower furnace as a bottom layer for the next smelting process.

The different process steps of producing stainless steel are solved according to the invention in that, for stainless steel, the furnace hearth is designed as a launder tilting device, including a circumferential section of the lower furnace that can be turned upwards and downwards. The advantage lies in the use of the so-called Perin-Effekt, whereby the slag is discharged with the molten steel and is separated again after agitation in the treatment vessel in order to recover the chromium contained in the slag.

Other features are that the tapping area of the launder tilting device is provided with a molten steel and slag separation launder (Siphon) for tapping the molten steel without slag.

Known double-vessel installations are an electric arc furnace and a converter, while other features provide that the two metallurgical vessels are formed by electric arc furnaces, each of which is optionally provided with its own transformer. The addition of a second oxygen top-blown lance allows both vessels to be operated simultaneously as oxygen top-blown vessels, or to operate one vessel as oxygen top-blown and the second vessel as an electric arc furnace, or vice versa, according to the general conditions provided. Depending on the schedule, one container can also be operated with oxygen top-blown method and the second container can also be operated with oxygen top-blown method or switched over to the electric arc furnace method.

Description of drawings

The figures show exemplary embodiments (of methods and devices) and they are described in detail below.

in:

Fig. 1 Cross-section of an electric arc furnace through the left vessel of the double vessel equipment;

Figure 2 has a top view of the lower furnace with blown brick arrangement;

Fig. 3 Cross section of electric arc furnace with different molten pool heights;

Figure 3A is a perspective view of a copper or steel shell used to form the upper furnace wall;

Fig. 4 Cross-section through a double-vessel plant, where the two vessels consist of an electric arc furnace;

Fig. 5 Cross-section through a single vessel, which alternately produces C-steel and stainless steel;

Figure 6 has a top view of a dual vessel apparatus with two oxygen top-blown lances; and

Figures 7A-7D show different modes of operation of the dual-container device.

Detailed ways

Figure 1 only shows a container in the double container equipment 1, an electric arc furnace 2 (shown on the left), which has a common rotary and lifting device 3, a rotary driving device 4 and a lifting driving device 5, which serve as introduction or The process unit taken out is transferred into, lifted, lowered or transferred out of the oxygen top blowing spray gun 6 and the arc electrode system 7 (see Fig. 4). The electric arc furnace 2 is composed of a lower furnace 2a and an upper furnace 2b. In the lower furnace 2a, the furnace type 8 of the furnace lining 9, which as usual consists of a permanent lining and a wearing lining, is designed for the favorable flow conditions of molten steel 10 and slag 11 . This is an arrangement 12 of bottom blown bricks 14 in the bottom 13 of the lower furnace 2 a , which interacts between the oxygen top-blown jet 6 a and the upward free jet 14 a of the bottom blown brick 14 .

Said interaction first increases the tonnage of steel per furnace by increasing the arrangement 12 of blown bricks 14 at the bottom of the molten pool depth 15, by enhancing the process of smelting and blowing and by increasing the amount of steel per unit time. production capacity. For this reason, when the blowing angle α=15°-40° of the nozzle 6b relative to the vertical line, the bottom blowing brick 14 is adjusted to leave the molten pool edge 17 with a minimum distance 16 of -2/3 and to leave the molten pool edge 17 with a distance of -1/3 The distance 18 is 19 away from the center of the molten pool. The upward free jet 14 a consists of a maximum of 2 Nm ³ of argon or nitrogen per minute and per bottom blowing brick 14 . Blow in about 100-500 Nm ^oxygen per minute through the oxygen top blowing lance 6 . The holes of the bottom blow brick 14 are operated with nitrogen (N ₂ ) or argon (Ar) respectively and supplied with a maximum of 2 Nm ³ /min. The large number of bottom blown bricks 14 (eight bottom blown bricks 14 are used in this embodiment) improves the effect on the melt flow.

Oxygen (O ₂ ) or hydrocarbons (CH ₄ ) are blown in at an angle of 5°-45° relative to the horizontal during the refining stage by additionally inserting side blowing lances 20 below the slag 11 .

The melt pool depth 15 is between 1000 mm and 1800 mm in the illustrated exemplary embodiment. When the bottom blowing brick 14 (Fig. 2) is adapted to the shape of the container or arranged in a ring 12, it is respectively set within a minimum distance 16 of 2/3 from the edge 17 of the molten pool and a distance of 1/3 from the center 19 of the molten pool 18. In this case, the blowing angle α of the nozzle 6b of the oxygen top-blowing lance 6 relative to the vertical line is α=15°-40°, and the upstroke free jet 14a blows and punches at a maximum rate of 2Nm per minute and each bottom brick 14 ³ Argon or oxygen work.

The upper furnace 2b, which is connected to the lower furnace 2a according to FIG. 2, consists of a cooled copper housing 21, cold plates, copper walls, refractory wall panels and/or liquid-cooled pipes 22 (without gap distances).

The side blowing lances 20 are distributed along the furnace circumference 23 and pass through respective copper walls of the upper furnace 2b. The (copper) wall can be formed by a cooled copper shell 21 , a cold plate, a copper wall, a refractory wall and/or a liquid-cooled tube 22 (as described in FIG. 1 ) without gap distances. The side-blowing lance 20 passing through the copper wall can be designed as a consumable side-blowing lance 20a.

In order to produce C-steel, the lower furnace 2a is provided with an eccentric bottom tapping hole 24 and a closed valve 25 .

For stainless steel, the lower furnace 2a is designed as a launder tilting device 26 comprising a hoistable and closing circumferential section 27 .

In FIG. 2 the arrangement 12 of blown bricks 14 inside the bottom 13 lining 9 can be seen in the electric arc furnace 2 and in the lower furnace 2a.

The outer bottom blow bricks 14 are located at a minimum distance 16 from the edge 17 of the molten pool, which distance 16 is approximately equal to 2/3 of the distance between the edge 17 of the molten pool and the center 19 of the molten pool. Similarly, these outer bottom blow bricks 14 are located at a distance 18 from the center 19 of the molten pool, which distance 18 is substantially 1/3 of the distance between the edge 17 of the molten pool and the center 19 of the molten pool.

The furnace lining 9 is cooled by means of a water-cooled copper casing 21 or similar. The eccentric bottom tapping hole of molten steel 10 is on the right side. On the outside of the bottom taphole 24, different from the specific steelmaking production process, above the slag outlet 28 and opposite to the exhaust port 29, an opposite slag door 28a is set, thus forming a design with a rotatable The form of embodiment of the launder tilting device 26 of the circumferential section 27 can also discharge the slag 11 when it is in the swivel out position, so as to empty the lower furnace 2a.

FIG. 3 shows another vessel for the electric arc furnace 2 . The lower furnace 2 a has the illustrated arrangement 12 of bottom blown bricks 14 . But generally the upper and lower furnaces 2a are designed with an enlarged molten pool depth 15a. This bath depth 15 a is formed by a punched bowl-shaped bottom 15 b with said furnace lining 9 , which is attached additionally to the vessel bottom 13 . The upstroke free jets 14a of the arrangement 12 through the bottom blowing brick 14, where they are supplemented by the oxygen top blowing lance 6 with a high oxygen content of 100-500Nm ³ /min to enhance the stirring of the molten steel 10, resulting in a higher efficiency of this method. smelting and refining capabilities. The resulting higher heat load of the upper furnace 2b is absorbed by some copper shells 21, which can also be passed through smooth water-cooled copper (or steel) cold plates or water-cooled and refractory-lined walls or by a flow-through The refractory cover of the tube layer composed of the water-passed liquid-cooled tubes 22 is formed, and there is no gap between the tubes 22 .

The double vessel plant according to FIG. 4 consists of two electric arc furnaces 2 . Molten steel 10 is refined in the left container with oxygen top-blown lance 6 under the condition of feeding 100-500 Nm ³ /min of oxygen, while in the right container the filler is smelted when the maximum energy supply is 140-160MVA. Add N ₂ or Ar for stirring into the left container through the bottom blowing brick 14 to form an upward free jet 14a of 2 Nm ³ /min per minute and each bottom blowing brick 14 .

The eccentric bottom taphole 24 allows the C-steel to be tapped without slag 11 . The respective vessel is converted into a launder tilting device 26 when producing stainless steel. In this case, the desired simultaneous flow of slag occurs by tilting up the pivotable circumferential section 27 . Chromium is recovered from the slag 11 (Cr ₂ O ₃ ) collected in the tapping vessel.

The launder tilting device 26 together with the molten steel and slag separation launder forms a further embodiment in order to keep the desired slag (FeO slag) in the electric arc furnace 2 . The upper furnace 2b is equipped with a smooth water-cooled copper or steel casing 21 on the inside. Depending on the thermal load, e.g. depending on the blowing time, the layup is carried out by means of copper or steel casings 21 or equivalent cold plates, copper walls, refractory panels, refractory covers and/or liquid cooling pipes 22 (without gap distances) to avoid The splashed molten steel clamps. With a furnace length 30 equal to, for example, 8000 mm, a bath depth 15 or increased bath depth 15 a of, for example, 1700 mm is a prerequisite. The arrangement 12 of the bottom blow bricks 14 is as explained above for FIG. 2 .

The mode of operation of the tilting device 26 for the production of stainless steel or C-steel as launder is shown in FIG. 5 . In the production of stainless steel, instead of using an eccentric bottom tap hole 24 as in the production of C-steel, the "launder tilter effect" with an upwardly turned circumferential section 27 is used. Then the molten steel 10 is discharged together with the slag 11 into the processing vessel 31 to utilize the so-called Belling effect. The reduction or recovery of chromium in this case proceeds according to the following formula:

Cr ₂ O ₃ +3C＝2Cr+3CO

or

2Cr ₂ O ₃ +3Si＝4Cr+3SiO ₂

In FIG. 6, the double vessel plant 1 has an embodiment comprising two electric arc furnaces 2 or each comprising a lower furnace 2a. As already described, the electric arc furnace 2 is equipped with a central turning and lifting device 3 which, according to the embodiment described above, is designed for introducing or removing process units. The process group includes at least one arc electrode system 7, which rotates around the column of the rotary and lifting device 3 to the top of the left container or the top of the right container. In addition, the process group also includes oxygen top blowing lances 6, 6c and side blowing lances 20. Electrical energy is supplied to the arc electrode system 7 via at least one transformer 7a. In FIG. 6, unlike the design already described above, the first oxygen top-blowing lance 6 (right container) and the second oxygen top-blowing lance 6c (left container) can be rotatably mounted around a separate rotary and lifting device 3a, respectively. . Therefore, according to the structural design shown in the figure, equipment time and maintenance time can be saved during compound operation. During compound operation, pig iron is blown by oxygen top blowing method in the first stage in a container and in the second stage in the electric arc furnace 2 Smelting direct reduced iron. With 100% feed of pig iron, each vessel in the electric arc furnace 2 is operated with pure oxygen top blowing, for example with 10-100% direct reduced iron (DRI) or other expressions, i.e. by running two vessels or Only one vessel processes 90-0% pig iron (equivalent to 100% direct reduced iron) in pure oxygen top blowing process temporarily or continuously.

It is also possible to adopt a design in which a single rotary and lifting device 3 for (if necessary arc electrode system 7) first oxygen top-blowing lance 6 and second oxygen top-blowing lance 6c is installed, for example, on the central axis between the containers Inside the slewing and lifting device 3 column on 1a.

Fig. 7A respectively represents known working modes such as stirring operation, blowing and smelting in a "vessel 1 in the loop" (or "vessel 2 in the loop") with a time diagram. Here it is based on the use of one or two oxygen top-blown lances 6 , 6 c and an arc electrode system 7 . The blowing time (B) and melting time (E) of each vessel last the same length, taking into account the setup time, for maximum productivity. This consistency can be achieved especially at a mix ratio of pig iron (RE) to direct reduced iron (DRI) of 40% to 60%. The current time interval 33 between two discharges of the molten steel 10 results from the discharge time 32 .

The time axis of "the second container 2 in the loop" is shifted by exactly half a cycle. The mixing operation in each vessel causes the two process lines to interlink and thus become related to each other. A disturbance of the process in one line (blow time and smelting time varies) immediately affects the other line, or vice versa. This double cross-linking of the consistency of the blowing time and the melting time on the one hand and the synchronicity between the two process lines on the other hand is highly susceptible to disturbances and can thus actually lead to production failures.

Compared with the stirring operation described above for Fig. 7A, Fig. 7B respectively represents the pure oxygen top blowing process (B) in "a container 1 in the circuit" or "a container 2 in the circuit", wherein it can occur according to Fig. 7B A top-blown process of pure oxygen as done in a converter or in each vessel in an electric arc furnace. For this, 100% pig iron is a prerequisite, for example, when the blast furnace is operating at full capacity and, for example, in the event of a failure of a direct reduction plant. Therefore, in the two containers "in-circuit container 1" and "in-circuit container 2", the oxygen top blowing method (B) is used, so that after the pig iron is charged, the blowing process (B) is always carried out independently of the other container . In contrast to the method according to FIG. 7A , in FIG. 7B there is no dependence of the process time between the first and second container.

Prerequisites for the process in FIG. 7C are the oxygen top-blown lances 6 and 6C and the arc electrode system 7 for processing filler pig iron and directly reduced iron in proportions between 10% and 100% pig iron. Obviously, the process steps blowing (B) and smelting (E) can be carried out arbitrarily and independently of each other within the two process lines. The disturbance is limited to the current smelt and is not propagated contrary to the approach in Fig. 7A, neither into one process line nor through it to another process line.

Figure 7D shows the case where only one container ("in-loop container 1") is used, specifically the case where only direct reduced iron and/or scrap iron is provided. When only one arc electrode system 7 is present, it is possible to work with only one vessel. Thus ("in-loop vessel 2") indicates neither blowing time nor smelting time.

In summary, it can be seen that the different modes of operation according to Figures 7B-7D result in more raw steel being produced per day, the method (process) is more flexible and allows the method to be adapted to different situations during operation.

List of reference signs

1 double container equipment; 1a central axis between containers; 2 electric arc furnace; 2a lower furnace/bottom furnace; 2b upper furnace/top furnace; 3 rotary and lifting device; 3a separated rotary and lifting device; 4 rotary drive device; 5 lifting drive device; 6 first oxygen top blowing lance; 6a oxygen top blowing jet; 6b nozzle; 6c second oxygen top blowing lance; 7 arc electrode system; 7a transformer; 8 furnace type; 9 furnace lining; 10 molten steel; 11 slag ;12 Arrangement of blow-blow bricks at the bottom; 13 Container bottom; 14 Blow-blow bricks at the bottom; edge of molten pool; 18 distance; 19 center of molten pool; 20 side blowing lance; 20a consumable side blowing lance; 21 copper or steel shell, etc.; Closed valve; 26 launder tilting device; 27 rotatable circumferential section; 28 slag outlet; 28a slag door; 29 exhaust port; 30 furnace length; 31 processing container; 32 discharge time; Time interval; B blowing time; E melting time; RE pig iron; DRI direct reduced iron

Claims (14)

1. A method for the production of ordinary or high-quality steels of different qualities using a double-vessel plant (1) comprising a turning and lifting device (3) for introducing or withdrawing process units, wherein the furnace lining ( The furnace type (8) of 9) is designed according to the favorable flow conditions of molten steel (10) and/or slag (11), and the mode is: the arrangement (12) in the bottom (13) of the lower furnace (2a) is provided with bottom blowing Bricks (14), the arrangement is determined according to the interaction between the oxygen top-blown jet (6a) and the upstroke free jet (14a) of the bottom-blown brick (14), characterized in that at the depth of the molten pool (15) Under the situation of being about 1000mm to 1800mm, when the nozzle (6b) of the oxygen top-blowing spray gun (6) is relative to the blowing angle α=15°-40° of the vertical line, the upstroke free jet of the bottom blowing brick (14) (14a) adjusted to be within a minimum distance of 2/3 (16) to the edge of the molten pool (17) and to the center of the molten pool (19) at a distance of 1/3 (18), and the upper punch is free The jet ( 14 a ) is formed with a maximum of 2 Nm ³ of argon or nitrogen per minute and per bottom blowing brick ( 14 ). 2. The method according to claim 1, characterized in that oxygen is additionally blown in during the refining stage by side blowing lances (20) inserted under the slag (11) at an angle of 5° to 45° relative to the horizontal. 3. The method according to one of claims 1 or 2, characterized in that both containers are operated simultaneously with oxygen. 4. The method according to any one of claims 1 to 3, characterized in that oxygen is blown in at 100-500 Nm ³ /min through the oxygen top-blowing lance (6) when the minimum molten pool depth is about 1000 mm to 1800 mm. 5. An equipment for producing ordinary or high-quality steels of different qualities, including two metallurgical containers, and a rotary and lifting device (3) for introducing or taking out process units is arranged between the containers, wherein the furnace lining (9) Type (8) is designed according to the favorable flow conditions in the molten steel (10) and/or in the slag (11), and the mode is: the arrangement (12) in the bottom (13) of the lower furnace (2a) is provided with bottom blowing bricks (14 ), the arrangement is determined according to the interaction between the oxygen top-blown jet (6a) and the upstroke free jet (14a) of the bottom-blown brick (14), characterized in that the lower furnace (2a) has about 1000mm to 1800mm The depth of the molten pool (15); when the arrangement (12) is generally circular, the bottom blowing bricks (14) are set to the edge of the molten pool (17) within a minimum distance (16) of -2/3 and The distance (18) of one 1/3 to molten pool center (19); The nozzle (6b) of oxygen top-blown lance (6) is relative to the blowing angle α=15 °-40 ° of vertical line, and rushes up the free jet ( 14a) Work with max. 2Nm ³ argon or oxygen per minute and per bottom blow brick (14). 6. Apparatus according to claim 5, characterized in that the increased bath depth (15a) is achieved by means of a punched bowl (15b) connected to the container bottom (13) or an integral punched bowl (15b) Formation. 7. According to the described equipment of one of claim 5 or 6, it is characterized in that the second oxygen top-blowing lance (6c) is installed on an additional separate part on a turn-in and turn-out radius outside the central axis (1a). on the slewing and lifting device (3a). 8. According to the described equipment of one of claims 5 to 7, it is characterized in that, the upper furnace (2b) that is connected on the lower furnace (2a) is made of cooled copper shell (21), cold plate, copper wall, refractory wall plate And/or the liquid cooling tube (22) is formed without gap distance. 9. The apparatus as claimed in claim 5, characterized in that the side-blowing lances (20) distributed along the furnace circumference (23) penetrate the corresponding wall of the upper furnace (2b). 10. The device according to claim 7, characterized in that the side-blowing lance (20) passing through the slag door (28a) is designed as a consumable side-blowing lance (20a). 11. The plant according to one of claims 5 to 10, characterized in that, for C-steel, the lower furnace (2a) is provided with an eccentric bottom tapping hole (24) for slag-free tapping. 12. According to the described equipment according to any one of claims 5 to 11, it is characterized in that, for stainless steel, the lower furnace (2a) is designed as a launder tilting device (26), comprising a turning-up and lower Turn the circle segment (27). 13. According to the described equipment according to any one of claims 5 to 12, it is characterized in that the tapping zone of the launder tilting device (26) is provided with a molten steel and slag separation launder for the molten steel (10) to be tapped without slag . 14. Plant according to one of claims 5 to 13, characterized in that the two metallurgical vessels are formed by electric arc furnaces (2), each of which is optionally provided with its own transformer (7a).

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