EP1181491B1 - Metallurgisches gefäss mit einer abstichvorrichtung und verfahren zum kontrollierten, schlackenfreien abziehen von flüssigem metall aus diesem gefäss - Google Patents
Metallurgisches gefäss mit einer abstichvorrichtung und verfahren zum kontrollierten, schlackenfreien abziehen von flüssigem metall aus diesem gefäss Download PDFInfo
- Publication number
- EP1181491B1 EP1181491B1 EP00925154A EP00925154A EP1181491B1 EP 1181491 B1 EP1181491 B1 EP 1181491B1 EP 00925154 A EP00925154 A EP 00925154A EP 00925154 A EP00925154 A EP 00925154A EP 1181491 B1 EP1181491 B1 EP 1181491B1
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- EP
- European Patent Office
- Prior art keywords
- vessel
- leg
- discharge duct
- molten metal
- metallurgical vessel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 238000010079 rubber tapping Methods 0.000 title claims abstract description 70
- 239000002184 metal Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims description 29
- 238000000605 extraction Methods 0.000 title 1
- 229910001338 liquidmetal Inorganic materials 0.000 claims abstract description 21
- 239000002893 slag Substances 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 11
- 230000006698 induction Effects 0.000 claims description 10
- 230000000977 initiatory effect Effects 0.000 claims description 8
- 239000011819 refractory material Substances 0.000 claims description 8
- 238000009423 ventilation Methods 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 230000000717 retained effect Effects 0.000 claims description 4
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- 230000001276 controlling effect Effects 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000005253 cladding Methods 0.000 claims 2
- 238000011010 flushing procedure Methods 0.000 claims 2
- 239000000155 melt Substances 0.000 description 11
- 239000007789 gas Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 230000001939 inductive effect Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
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- 230000000149 penetrating effect Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
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- 238000010891 electric arc Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000004941 influx Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
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- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D39/00—Equipment for supplying molten metal in rations
- B22D39/003—Equipment for supplying molten metal in rations using electromagnetic field
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/113—Treating the molten metal by vacuum treating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
- F27B3/19—Arrangements of devices for discharging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/15—Tapping equipment; Equipment for removing or retaining slag
- F27D3/1545—Equipment for removing or retaining slag
- F27D3/159—Equipment for removing or retaining slag for retaining slag during the pouring of the metal or retaining metal during the pouring of the slag
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
- F27D2003/0054—Means to move molten metal, e.g. electromagnetic pump
- F27D2003/0056—Means to move molten metal, e.g. electromagnetic pump through a syphon in a vacuum chamber, e.g. involving aspiration or pressure on the bath
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D9/00—Cooling of furnaces or of charges therein
Definitions
- the invention relates to a metallurgical vessel with a tapping device for Controlled, slag-free removal of liquid metal according to the generic term of claim 1. Furthermore, it relates to a method using such a tapping device.
- a device and a method for passing a predetermined amount of liquid metal from a metal bath containing a molten metal Receiving containers become known by means of a refractory-lined drainage pipe, where the principle of a liquid lifter is exploited.
- the drainpipe is in Form an inverted U or V with two legs pointing down, of which the first an inlet opening and the second one by a closure device has gas-tight closable outlet opening for the liquid metal.
- a vacuum device Fireproof lined pipe socket provided, which optionally via a first valve the vacuum device can be connected or via a second valve with the free atmosphere is connectable.
- the vessel containing a molten metal bath in particular a melting furnace vessel
- the second leg through the closure device sealed gas-tight, through a closable opening in the through water-cooled elements formed wall of the vessel top in the molten metal bath submerged, acting as a vent valve second valve closed and the first Open valve to connect the drain pipe with the vacuum device.
- the Vacuum suction of the vacuum device the molten metal is pulled up in the first leg and runs over an overflow edge in the connecting region of the two legs in the second leg.
- the closure device of the second Schenkels open, and the liquid metal on the principle of the liquid lifter in the Receptacle, preferably a pan, passed over.
- the flow through the spillway can be interrupted so that a controlled, slag-free removal of the molten metal is possible.
- the inlet opening before immersion in the molten metal bath by a sheet, which melts after immersion and releases the inlet opening.
- the closure plate of the closure device is before the tapping off of the furnace vessel granular ff material filled in the second leg, the rest in the lower area has a narrowing.
- DE-C 605 701 is a siphon for emptying thermal baths become known, in which in the surrounded by a heating jacket intake manifold an ejector nozzle is installed, which is heated together with the intake manifold. Through the ejector nozzle A negative pressure is generated, with which the process for controlled removal of Liquid is introduced from the vessel.
- the object of the invention is, in a metallurgical vessel with a tapping according to the preamble of claim 1, regardless of the vessel size to allow a safe controlled slag-free removal of liquid metal.
- a tapping There are various modifications of the tapping indicated be, in which an initiation of the tapping without negative pressure is possible, so that a vacuum device is unnecessary.
- a procedure for the controlled slag-free stripping of liquid metal from a metallurgical Container can be specified using such a device.
- the metallurgical vessel according to the invention with a tapping device is characterized by the Features of claim 1 characterized.
- Advantageous embodiments of the tapping device can be found in claims 2 to 28.
- the inventive method is characterized by the features of claim 29.
- Advantageous embodiments This method can be found in the remaining claims.
- the tapping can be dispensed with. This is done by a pressure compensation between the free atmosphere and the connecting region of the two legs, preferably via a vent valve or by the operation of the closure device allows a quick termination of tapping at any time, so that It can be ensured that with the removal of the liquid metal no slag is dragged out of the floating on the molten metal slag layer.
- the furnace vessel 1 of an electric arc furnace shown in section.
- the furnace vessel 1 consists of one, the brick oven hearth forming vessel lower part 2 for receiving the melt 3 and from a vessel upper part 4, which is formed of water-cooled elements.
- the bottom of the Vessel lower part 2 falls to the tapping 5 out.
- a Bodenabstich 9 of conventional design is then used when the furnace vessel, for example, before a furnace stoppage for repair or re-delivery should be completely emptied.
- the furnace vessel can in a known manner in the direction the tapping 5 be designed tiltable.
- the tapping device according to the However, invention does not require a tilting of the vessel, so that constructive Measures for tilting the furnace vessel and in the case of SchrottvormoreJraum to lift the shaft before tilting the furnace vessel unnecessary.
- At a fixed stove can then equal to the water cooling elements on the tapping side long as the other water cooling elements are formed so that further savings on refractory material in the vessel wall are possible.
- a refractory material surrounded drain channel 10 in the form of an inverted V with two down facing, upwardly connected legs 11 and 12 is formed.
- the first leg 11 of the drainage channel penetrates the fireproof vessel wall 15 of the vessel base 2 seen from the oven interior obliquely increasing.
- the second leg 12 is outside the furnace vessel 1 and has parallel to the vessel wall 15 vertically downwards. For manufacturing and maintenance reasons is the Outside of the refractory vessel wall 15 lying region of the tapping 5 by means a flange 16 with the refractory vessel wall penetrating portion of the Outflow channel 10 connected.
- the first leg 11 of the discharge channel 10 has an inlet opening 17 with a Top edge 18, through which a height h0 is defined.
- the second leg 12 of the discharge channel 10 has a through a closure device 19 closable outlet opening 20 for the liquid metal 3, which is lower than the Upper edge 18 of the inlet opening 17 of the discharge channel 10 on a designated hA Height is.
- the closure device 19 is only schematically by a closure plate 21, which is repeated by means of a drive from one at the edge of the outlet opening 20 adjacent closed position in a release opening 20 releasing release position and is movable from the release position to the closed position. Will the Tapping over a second leg 12 from the previous tapping retained residue or a previously over the overflow edge 14 of the drainage channel inflowed overflow amount of the molten metal 3 is initiated, then in terms of Tightness of the closure by the closure device no special requirements to deliver.
- the second leg 12 of the drainage channel 10 is extended below by a protective tube 22, that surrounds the metal beam when tapping the oven vessel 1 in a pan and him thus shields against the free atmosphere.
- the flow area of the discharge channel is formed relatively large and just before the outlet opening 20, a flow-limiting section 23 with provided reduced flow area. Because this section due to the higher Flow rate is particularly stressed, he is as an independent, interchangeable Section formed (not shown). Apart from the section with reduced Flow area, which is used to form a jet with a circular Cross section preferably has a circular flow area, is in the Embodiment of the flow area of the discharge channel at least in the region of Inlet opening 17 of the first leg 11 rectangular or oval with a larger width than Height formed so that the remaining at tapping liquid sump Top edge 18 of the inlet opening 17 is located as far down. Dimensions of the clear cross section of the inlet opening with a width of about 30 cm and a height of about 20 cm have proven to be advantageous.
- a Heating device In order with regard to an unhindered outflow of the melt during tapping a to hold in the drainage channel existing molten metal in the liquid state or a to liquefy frozen residual melt is the surrounding the spillway refractory material or a molten metal located in the drainage channel by means of a Heating device can be heated.
- an inductive heating by means of a first, the first leg 11 of the discharge channel 10 surrounding induction coil 24 and a second, the second leg 12 of the discharge channel 10 surrounding induction coil 25 provided.
- the induction coils can be acted upon separately with alternating current, so that as needed one in the first leg 11 or a second leg 12 located Molten metal can be heated.
- insulating layers 26 are provided to the heat flow from the spillway to the cooled turns of the induction coils 24 and 25 to reduce.
- the positively-cooled coils of the induction coils 24 and 25 can also be used to cool a retained metal melt in the drainage channel.
- the insulating layers 26 are dispensed with.
- the connecting portion 13 of the two legs 11 and 12 of the discharge channel 10 are at the embodiment in each case in alignment with the respective leg with ff material lined pipe socket 27 or 28 provided.
- the with the first leg 11th aligned first pipe socket 27 is gas-tight manner by means of a flange 29 closed.
- a second Flange 30 can be connected to at least one external device.
- the second flange 30 is provided with a connecting pipe 31, to which via a first valve 32nd a vacuum device 39 shown symbolically in FIG. 2 can be connected.
- a branch of the connecting pipe 31 is a second valve, which serves as a vent valve 33 is called, as when opening this valve, a connection to the free atmosphere can be produced.
- a connection to the free atmosphere can be produced.
- To reduce the free volume in the connection area 13 of the two legs 11 and 12 are on the inner sides of the flanges 29 and 30th refractory plugs 34 and 35 attached.
- When removing the flanges 29 and 30 is the The interior of the legs 11 and 12, which are aligned with the respective pipe sockets, for inspection purposes. and maintenance purposes.
- At least one of the pipe socket can also be used either instead of or in addition to the induction heating a burner as a heating device for the spillway or located in the spillway To connect molten metal.
- FIG. 2 the part of the vessel containing the tapping in enlarged
- some modifications and ancillary devices are shown which illustrate the Operation of the tapping device favor in some variants.
- Solidification of the melt in this leg can be prevented by being in the vicinity the spillway inlet opening 17 a second, via a compressed gas line to a compressed gas source connectable, porous sink 37 are provided, which at the top the outflow channel opens, and with a circulation of the liquid metal in the first Leg 11 is achievable.
- a porous sink in the bottom of the vessel base 2 for example, in a similar location as the Bodenabstich 9 in the vicinity of Provide spillway inlet opening 17 to by circulation in this area a Counteract cooling.
- the reference numeral 40 designated device provided for detecting and controlling the height of the bath mirror h4 in connection region 13 of the two legs 11 and 12 of the drainage channel 10th
- This device 40 includes a, the height of the bath level h4 detecting level sensor, whose output signal via a control loop z. B. the negative pressure of the vacuum device 39 regulates.
- the acting in the connecting region 13 of the two legs 11 and 12 Underpressure may also be provided using a constant negative pressure Vacuum device 39 are regulated by the fact that supplied by the level sensor Control signals are supplied to a control valve 38 through which in the intake of the Vacuum device 39 controls false air to maintain the set point set level h4 is supplied.
- the regulating device for maintaining a given height of the bath level h4 is unnecessary, if the length of the pipe socket 27th and 28 is sized so that the vulnerable elements always above the maximum Suction height of the molten metal lie.
- the tapping 5 designed and operated so that at each tap the second leg is completely emptied, then preferably, as from the introductory WO 86/04980 known after tapping and re-closing the Outlet opening 20 of the discharge channel 10 by means of the closure plate 21 from above granular ff material filled in the second leg.
- the connecting pipe 31 for the connection of a vacuum device and the possibility of connecting to the free atmosphere via the ventilation valve 33 can then be associated with the first flange 29, which is connected to the first Leg 11 of the drainage channel 10 is aligned.
- the height h2 of the overflow edge 14 is located approximately at the same height as the maximum permissible bath level h3 of the molten metal 3. Since the slag layer 41 rests on the molten metal 3 in the vessel 1, the height h4 the bath level of the molten metal 3 in the spillway slightly larger than h3. This means, that shortly before reaching the maximum bath level h3 in the vessel 1 melt from the first leg 11 in the second leg 12 overflows and this leg of the drainage channel 10 fills. This state shortly before the tapping is shown in Fig. 1. The Free volume in the connection area 13 is due to a small difference kept small between heights h6 and h4.
- the tapping must be terminated, when the bath level of the molten metal 3 has reached the height h7.
- the termination of the Tapping process can either by closing the outlet opening 20 of the drain channel 10 done by means of a suitable closure device 19, by opening the vent valve 33, d. H. by false air supply in the connecting region 13 of the two Legs 11 and 12 or in a tiltable vessel by tilting back the vessel. in the the former case, the second leg 12 remains with a residual amount of molten metal at least partially filled. In the other cases, the second leg 12 emptied Completely.
- the tapping device according to the invention only one tapping when reaching of the maximum bath level h3 is intended, then the tapping at the in Fig. 1 illustrated height ratios, as described, without the use of a vacuum device solely by the existing in the second leg 12 remaining amount or overflow amount be carried out on melt, this possibly by the heater 24, 25 in to give a liquid state.
- the height h2 of the overflow edge 14 is lower than the height h3 of the maximum molten bath level arranged, then there is an overflow of the molten metal 3 in the second leg 12 guaranteed even if the bath level of the molten metal in the vessel 1 below the maximum height h3 is, namely, until the bath level of the molten metal has reached about the height h2.
- this area is thus blessed embodiment of the Volume of the second leg always a reliable initiation of the tapping process ensured by tightening the melt from the first leg. Will the Overflow edge 14 set lower, it takes place during melting of the material in the vessel.
- the overflow in the second leg 12 already some time before reaching the maximum bath level h3 the overflow in the second leg 12 and it must be here preferably by an inductive heating and / or Introducing a gas over the sink 37 and 36 a cooling and solidifying the Melt counteracted.
- the height h2 of the overflow edge 14 the height h0 of the upper edge 18 of the spillway inlet opening 17 is considered.
- the height h7 is not fallen below, d. H. it should apply: h2 ⁇ h7.
- this height information refers to the tilted Status.
- a vacuum device is required for the initiation of the tapping process, in the example shown to the connection channel 31 via the valve 32nd is connectable.
- the vacuum device is dependent on the liquid metal column to be lifted sized. Lower suction pressures could also be achieved by ejector nozzles according to the principle realize the aforementioned DE-C 605 701. A slight lifting of the Badapt in the first leg can also be by introducing gas through the porous Sink 36 and 37 achieve due to the drag effect.
- the outlet opening 20 of the discharge channel 10 is closed and filled into the lower portion of the second leg 12 granular ff material.
- the furnace 1 has been charged with feed and it will be the next batch melted down.
- the level of the bath rises in the melting vessel 1 and simultaneously in the first leg 11 of the drainage channel.
- the induction coil 24 is energized and / or gas introduced through the sink 37 and 36, respectively.
- melt flows out of the first leg 11 over the overflow edge 14 in the second leg 12 and fills it, and here too by energizing the induction coil 25, d.
- an inductive heating the melt a cooling is prevented. This is during the melting process Venting valve 33 is opened to a pressure build-up in the connecting region 13 of the two Prevent legs 11 and 12.
- vent valve 33 Before tapping the vent valve 33 is closed again and by opening the Closing device initiated the tapping. With the outflowing overflow amount in the second leg 12 is melt from the first leg 11 and the furnace vessel tightened until the height h7 is reached. By opening the vent valve 33 the removal process is interrupted by the supply of false air to a retraction of To prevent slag. An amount of liquid metal corresponding to the level of the bath remains as a swamp in the vessel. After again closing the closure device 19 and Fill in of free-flowing ff material is repeated the process described.
- the beam by means of the closure device 19 are interrupted, so that in the second leg 12 a residual amount retained liquid metal.
- One in the first leg 11 of the drainage channel below the level of the overflow edge 14 dropped bathroom mirror h4 can be used to initiate a new Abstichvorganges by means of the vacuum device, optionally including the bath level control by means of the level sensor of the device 40 and / or by Injecting gas through the porous sink 36 via the overflow edge 14 lift.
- the refractory vessel wall 115 of Vessel lower parts 102 penetrating first leg 111 of the discharge channel 110 has a horizontal first portion 111a and a vertical second portion 111b, which connected via an enlarged connection portion 113 with the second leg 112 is.
- the overflow edge 114 of the drainage channel 110 is set lower and instead a gas-tight seal above the enlarged connection area 113 is a Cover 143 provided with a cover penetrating the burner 144, with the enlarged connection area or an existing in this molten metal is heatable.
- the closure of the connection area caused by the cover 143 113 may be gas-tight. However, this is not a necessary condition since by the deep replacement of the overflow edge 114 a slag-free tap even then can be initiated and performed when the connection area 113 through the Cover 143 is not sealed airtight.
- the horizontal formation of the first portion 111 a of the first leg 111 subsequent to the bottom contour 108 of the lower vessel 102 and an embodiment of the Flow cross-section of the discharge channel 110 at least in the region of the inlet opening 117 of the first leg 111 in rectangular or oval shape with greater width than Height can be on the one hand through the section 123 with a reduced flow area limited flow velocity of the metal at the spillway inlet 117 hold low and on the other hand, the upper edge 118 of the spillway inlet opening 117 further than in a circular cross-section of the spillway inlet opening 117th shift down.
- the ratio between the cross section of the spillway inlet opening 117 and the cross section of the flow restricting portion 123 is located at about 4: 1.
- the metallurgical vessel shown in FIGS. 3 to 5 is designed to be tiltable.
- Fig. 3 shows the zero or working position of the vessel and Fig. 5, the tilted position. Of the Tilt angle is approximately between three and five degrees.
- the maximum tilted condition is decisive, that is, in the tilted state shown in Fig. 5 may be to ensure a slag-free tapping the height h2 of the overflow edge 114 is not below the height h7 lie, by the inlet vortex a retraction of the molten metal 103 floating slag 141 in the spillway 110 via the top edge 118 of the Outflow channel inlet 117 takes place.
- the slag-free tapping can be up to the height h7 one in the vessel 101st perform remaining molten metal 103 without any of a suction effect as a result a tight seal above the connection area 113 made use of must become.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Electromagnetism (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Furnace Charging Or Discharging (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Furnace Details (AREA)
Description
- Fig. 1
- ein metallurgisches Gefäß mit einer Abstichvorrichtung im Schnitt und
- Fig. 2
- den die Abstichvorrichtung enthaltenden Teil des Gefäßes mit einigen Modifikationen in vergrößerter Darstellung,
- Fig. 3
- den die Abstichvorrichtung enthaltenden Teil eines kippbaren Gefäßes im nicht gekippten Zustand in einer der Fig. 2 entsprechenden Darstellung mit modifizierter Form des Abflußkanals,
- Fig. 4
- den Schnitt IV-IV von Fig. 3,
- Fig. 5
- den in Fig. 3 dargestellten Teil des kippbaren Gefäßes im gekippten Zustand.
- hA =
- Höhe der durch die Verschlußplatte 21 verschließbaren Austrittsöffnungen 20 des Abflußkanals 10
- h0 =
- Höhe der Oberkante 18 der Abflußkanal-Eintrittsöffnung 17
- h1 =
- Höhe der Bodenkontur 8 vor der Eintrittsöffnung 17
- h2 =
- Höhe der Überlaufkante 14
- h3 =
- Höhe des maximal zulässigen Badspiegels der Metallschmelze 3
- h4 =
- Höhe der Metallschmelze im Verbindungsbereich 13 des Abflußkanals 10
- h5 =
- Höhe der Oberfläche einer auf dem Schmelzbad schwimmenden Schlackenschicht 41
- h6 =
- Höhe des Abschlusses durch die Stopfen 34 und 35 im Verbindungsbereich der beiden Schenkel 11 und 12, und
- h7 =
- Höhe des Badspiegels der Metallschmelze, bei dem durch Einlaufwirbel ein Einziehen von Schlacke in den Abflußkanal (10) erfolgt.
Claims (35)
- Metallurgisches Gefäß (1, 101) mit einer Abstichvorrichtung (5, 105) zum kontrollierten, schlackenfreien Abziehen von flüssigem Metall (3, 103) aus einem in dem Gefäßunterteil (2, 102) befindlichen Metallschmelzbad (3, 103), wobei die Abstichvorrichtung (5, 105) einen von feuerfestem Material umgebenen Abflußkanal (10, 110) enthält, der zwei nach unten weisende, oben verbundene Schenkel (11, 12, 111, 112) enthält, von denen der erste (11, 111) das Gefäß an einer eine Oberkante (18) aufweisenden Eintrittsöffnung (17, 117) durchdringt und der zweite (12, 112) eine mit einer Verschlußvorrichtung (19, 119) ausgestaltete, tiefer liegende Austrittsöffnung (20, 120) für das flüssige Metall (3, 103) aufweist, ferner innerhalb des Abflußkanals im Verbindungsbereich (13, 113) der beiden Schenkel (11, 12, 111, 112) eine Überlaufkante (14, 114) für das flüssige Metall in einer Höhe (h2) größer als die Höhe (h0) der Oberkante der Abflußkanal-Eintrittsöffnung definiert ist,
dadurch gekennzeichnet, daß der erste Schenkel (11, 111) des Abflußkanals (10, 110) die feuerfeste Ausmauerung der Gefäßwand (15, 115) des Gefäßunterteils (2) durchdringt und in diese integriert ist,
daß in der Arbeitsposition des Gefäßes die Überlaufkante (14, 114), niedriger als die Oberkante der feuerfesten Ausmauerung der Gefäßwand (15, 115) angeordnet ist, maximal jedoch in einer Höhe (h3) liegt, die durch den maximal zulässigen Badspiegel (h3) der Metallschmelze (3) definiert ist, und
daß wenigstens ein Teil des den Abflußkanal (10) umgebenden feuerfesten Materials oder einer im Abflußkanal befindlichen Metallschmelze (3) mittels einer Heizvorrichtung (24, 25, 144) beheizbar ist. - Metallurgisches Gefäß nach Anspruch 1,
dadurch gekennzeichnet, daß im Verbindungsbereich (13) der beiden Schenkel (11, 12) des Abflußkanals (10) wenigstens ein mit ff-Material ausgekleideter Rohrstutzen (27, 28) angeordnet ist, der mittels eines Flansches (29, 30) gasdicht verschließbar und/oder an wenigstens eine externe Vorrichtung anschließbar ist. - Metallurgisches Gefäß nach Anspruch 2,
dadurch gekennzeichnet, daß wenigstens einer der beiden Schenkel (11, 12) des Abflußkanals (10) einen mit dem betreffenden Schenkel fluchtenden Rohrstutzen (29, 30) aufweist. - Metallurgisches Gefäß nach Anspruch 2 oder 3,
dadurch gekennzeichnet, daß der Flansch (30) mit einem Anschlußrohr (31) versehen ist, an das über ein erstes Ventil (32) eine Vakuumvorrichtung (39) als externe Vorrichtung anschließbar ist. - Metallurgisches Gefäß nach einem der Ansprüche 2 bis 4,
dadurch gekennzeichnet, daß der Flansch (30) mit einem Anschlußrohr (31) versehen ist, das über ein zweites Belüftungsventil (33) mit der freien Atmosphäre verbindbar ist. - Metallurgisches Gefäß nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet, daß eine Vorrichtung (40) vorgesehen ist zum Erfassen und gegebenenfalls Steuern der Höhe des Badspiegels (h4) im Verbindungsbereich (13) der beiden Schenkel (11, 12) des Abflußkanals (10). - Metallurgisches Gefäß nach Anspruch 6,
dadurch gekennzeichnet, daß in Verbindung mit einer auf einen konstanten Druck einstellbaren Vakuumvorrichung (39) ein die Höhe des Badspiegels (h4) im Verbindungsbereich (13) der beiden Schenkel (11, 12) des Abflußkanals (10) erfassender Niveaufühler vorgesehen ist, der Steuersignale an ein Regelventil (38) liefert, das in einer den Verbindungsbereich (13) mit der freien Atmosphäre verbindenden Gasleitung vorgesehen ist. - Metallurgisches Gefäß nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet, daß in der Nähe der Abflußkanal-Eintrittsöffnung (17) wenigstens ein über eine Druckgasleitung an eine Druckgasquelle anschließbarer poröser Spülstein (36, 37) zum Einleiten eines Gases in das Innere des Gefäßes (1) oder des Abflußrohres (10) mündet. - Metallurgisches Gefäß nach Anspruch 8,
dadurch gekennzeichnet, daß der Spülstein (36, 37) an der Unterseite und/oder an der Oberseite des ersten Schenkels (11) in den Durchflußkanal des Abflußkanals (10) mündet. - Metallurgisches Gefäß nach einem der Ansprüche 2 bis 9,
dadurch gekennzeichnet, daß in der Arbeitsposition des Gefäßes der Flansch (29, 30) des Rohrstutzens höher liegt als die durch den maximal zulässigen Badspiegel der Metallschmelze definierte Höhe (h3). - Metallurgisches Gefäß nach einem der Ansprüche 1 bis 10,
dadurch gekennzeichnet, daß in der Arbeitsposition des Gefäßes (1) die Überlaufkante (14) höher liegt als das Niveau (h7) des Badspiegels der Metallschmelze, bei dem ein durch Einlaufwirbel oberhalb der Oberkante (18) der Abflußkanal-Eintrittsöffnung (17) bedingtes Einziehen von Schlacke aus der auf der Metallschmelze (3) schwimmenden Schlackenschicht (41) in das Abflußrohr erfolgt. - Metallurgisches Gefäß nach einem der Ansprüche 1 bis 13,
dadurch gekennzeichnet, daß in der Arbeitsposition des Gefäßes (1) die Überlaufkante (14) niedriger liegt als das Niveau (h5) des Bodens (42) einer in der Gefäßwand (15) vorgesehenen Schlackenablauföffnung (7). - Metallurgisches Gefäß nach Anspruch 12,
dadurch gekennzeichnet, daß in der Arbeitsposition des Gefäßes (1) die Überlaufkante (14) etwa in einer Höhe (h3) liegt, die durch den maximal zulässigen Badspiegel (h3) der Metallschmelze (3) definiert ist. - Metallurgisches Gefäß nach einem der Ansprüche 1 bis 13,
dadurch gekennzeichnet, daß der erste Schenkel (11) des Abflußkanals (10) die feuerfeste Gefäßwand (15) vom Ofeninneren aus gesehen schräg ansteigend durchdringt. - Metallurgisches Gefäß nach einem der Ansprüche 1 bis 13,
dadurch gekennzeichnet, daß der erste Schenkel (111) des Abflußkanals (110) einen waagrechten, ersten Abschnitt (111a) und einen senkrechten zweiten Abschnitt (111b) enthält, der über den Verbindungsbereich (113) mit dem zweiten Schenkel (112) verbunden ist. - Metallurgisches Gefäß nach einem der Ansprüche 1 bis 15,
dadurch gekennzeichnet, daß der zweite Schenkel (12) des Abflußkanals (10) innerhalb eines erkerartigen Vorsprungs des Ofengefäßes (1) angeordnet ist. - Metallurgisches Gefäß nach einem der Ansprüche 1 bis 16,
dadurch gekennzeichnet, daß im zweiten Schenkel (12) des Abflußkanals (10) ein den Durchfluß begrenzender Abschnitt (23) mit verringertem Durchflußquerschnitt vorgesehen ist. - Metallurgisches Gefäß nach Anspruch 17,
dadurch gekennzeichnet, daß der Abschnitt (23) mit verringertem Durchflußquerschnitt kurz vor der Austrittsöffnung (20) des Abflußkanals (10) angeordnet ist. - Metallurgisches Gefäß nach Anspruch 17 oder 18,
dadurch gekennzeichnet, daß der Abschnitt (23) mit verringertem Durchflußquerschnitt auswechselbar ist. - Metallurgisches Gefäß nach einem der Ansprüche 1 bis 19,
dadurch gekennzeichnet, daß der Durchflußquerschnitt des Abflußkanals (10) zumindest im Bereich der Eintrittsöffnung (17) des ersten Schenkels (11) rechteckig oder oval mit größerer Breite als Höhe ausgebildet ist. - Metallurgisches Gefäß nach einem der Ansprüche 1 bis 20,
dadurch gekennzeichnet, daß das Verhältnis zwischen dem Querschnitt der Abflußkanal-Eintrittsöffnung (17, 117) und dem Querschnitt des den Durchfluß begrenzenden Abschnittes (23, 123) bei etwa 4:1 liegt. - Metallurgisches Gefäß nach einem der Ansprüche 2 bis 21,
dadurch gekennzeichnet, daß an den Rohrstutzen (27) die Heizvorrichtung anschließbar ist. - Metallurgisches Gefäß nach einem der Ansprüche 2 bis 22,
dadurch gekennzeichnet, daß an einen, mit dem zweiten Schenkel (12) des Abflußkanals (10) fluchtenden Rohrstutzen (28) über eine Dosiervorrichtung ein Behälter mit körnigem ff-Material anschließbar ist. - Metallurgisches Gefäß nach einem der Ansprüche 1 bis 23,
dadurch gekennzeichnet, daß die Heizvorrichtung wenigstens eine den ersten und/oder zweiten Schenkel des Abflußkanals (10) umgebende Induktionsspule (24, 25) enthält. - Metallurgisches Gefäß nach einem der Ansprüche 1 bis 24,
dadurch gekennzeichnet, daß die Verschlußvorrichtung (19) der Austrittsöffnung (20) des Abflußkanals (10) eine Verschlußplatte (21) enthält, die mittels eines Antriebs wiederholt aus einer am Rand der Austrittsöffnung (20) anliegenden Schließposition in eine die Austrittsöffnung (20) freigebende Freigabeposition und aus der Freigabeposition in die Schließposition bewegbar ist. - Metallurgisches Gefäß nach einem der Ansprüche 1 bis 25,
dadurch gekennzeichnet, daß die Abflußrohr-Eintrittsöffnung (17, 117) benachbart zum Gefäßboden (8) angeordnet ist. - Metallurgisches Gefäß nach einem der Ansprüche 1 bis 26,
dadurch gekennzeichnet, daß das Gefäß (101) in Richtung der Abstichvorrichtung (110) kippbar ausgebildet ist. - Metallurgisches Gefäß nach einem der Ansprüche 1 bis 27,
dadurch gekennzeichnet, daß die Höhe (h2) der Überlaufkante (14, 114) höher, vorzugsweise nur geringfügig höher als die Höhe des Badspiegels (h7) einer im Gefäß (1) vorhandenen Metallschmelze (3, 103) liegt, bei dem durch Einlaufwirbel ein Einziehen von auf der Metallschmelze (3, 103) schwimmender Schlacke (41, 141) in den Abflußkanal (10, 110) über die Oberkante (18, 118) der Abflußkanal-Eintrittsöffnung (17, 117) erfolgt. - Verfahren zum kontrollierten, schlackenfreien Abziehen von flüssigem Metall aus einem in einem Gefäß befindlichen Metallschmelzbad nach dem Prinzip eines Flüssigkeitshebers mittels einer Vorrichtung nach einem der Ansprüche 1 bis 28,
bei dem nach einem Abstichvorgang die Austrittsöffnung des Abflußkanals verschlossen, gegebenenfalls der Schmelzbadspiegel im Gefäß, insbesondere durch Einschmelzen von Metall, bis zu einer Abstichhöhe vergrößert und der Abstichvorgang, nach Schließen eines in einer Abzweigung des Verbindungsbereiches der beiden Schenkel vorhandenen Belüftungsventils eingeleitet wird durch Öffnen der Verschlußvorrichtung des zweiten Schenkels und Ableiten einer im zweiten Schenkel vom vorhergehenden Abstichvorgang zurückbehaltenen Restmenge und/oder einer vorher über die Überlaufkante des Verbindungsbereiches der beiden Schenkel zugeflossenen Überlaufmenge der Metallschmelze, wodurch weitere, im ersten Schenkel und im Gefäß vorhandene Metallschmelze nachgezogen wird. - Verfahren nach Anspruch 29,
dadurch gekennzeichnet, daß zur Einleitung des Abstichvorgangs nach dem Schließen des Belüftungsventils und vor dem Öffnen der Verschlußeinrichtung durch Anschließen einer Vakuumeinrichtung an den Verbindungsbereich der beiden Schenkel des Abflußkanals Metallschmelze aus dem ersten, mit dem Gefäßinneren verbundenen Schenkel angesaugt und über die Überlaufkante in den zweiten Schenkel transportiert wird. - Verfahren nach Anspruch 29 oder 30,
dadurch gekennzeichnet, daß zur Einleitung des Abstichvorganges nach dem Schließen des Belüftungsventils und vor dem Öffnen der Verschlußeinrichtung durch Kippen eines in Richtung des Abflußkanals kippbaren Gefäßes Metallschmelze aus dem ersten, mit dem Gefäßinneren verbundenen Schenkel angesaugt und über die Überlaufkante in den zweiten Schenkel transportiert wird. - Verfahren nach einem der Ansprüche 29 bis 31,
dadurch gekennzeichnet, daß vor dem Einleiten des Abstichvorgangs das Innere wenigstens eines der beiden Schenkel das Abflußkanals bzw. eine in dem betreffenden Schenkel vorhandene Metallschmelze aufgeheizt wird. - Verfahren nach einem der Ansprüche 29 bis 32,
dadurch gekennzeichnet, daß zur Beendigung des Abstichvorganges das Belüftungsventil geöffnet wird. - Verfahren nach einem der Ansprüche 29 bis 33,
dadurch gekennzeichnet, daß bei einem kippbaren Ofengefäß zur Beendigung des Abstichvorganges das Gefäß in eine zum Abflußkanal entgegengesetzte Richtung gekippt wird. - Verfahren nach einem der Ansprüche 29 bis 34,
dadurch gekennzeichnet, daß nach Beendigung des Abstichvorganges und Schließen der Verschlußvorrichtung des zweiten Schenkels des Abflußkanals in den unteren Abschnitt dieses Schenkels körniges ff-Material eingefüllt wird.
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DE19919378A DE19919378A1 (de) | 1999-04-01 | 1999-04-28 | Metallurgisches Gefäß mit einer Abstichvorrichtung und Verfahren zum kontrollierten, schlackenfreien Abziehen von flüssigem Metall aus diesem Gefäß |
DE19919378 | 1999-04-28 | ||
PCT/EP2000/002903 WO2000060297A1 (de) | 1999-04-01 | 2000-03-31 | Metallurgisches gefäss mit einer abstichvorrichtung und verfahren zum kontrollierten, schlackenfreien abziehen von flüssigem metall aus diesem gefäss |
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AT (1) | ATE246791T1 (de) |
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DE102008008033A1 (de) | 2007-08-04 | 2009-02-05 | Sms Demag Ag | Einrichtung zum schlackenfreien Abstich oder zur Überführung einer Schmelze |
CN102735066A (zh) * | 2012-06-14 | 2012-10-17 | 芜湖楚江合金铜材有限公司 | 潜流式通道机构及使用所述机构进行溶液流通控制的方法 |
DE102013219686A1 (de) | 2013-09-30 | 2015-04-02 | Siemens Vai Metals Technologies Gmbh | Gefäßunterteil, ein damit ausgebildetes metallurgisches Gefäß sowie Elektrolichtbogenofen und Verfahren zu dessen Betrieb |
DE102013219682A1 (de) | 2013-09-30 | 2015-04-02 | Siemens Vai Metals Technologies Gmbh | Gefäßunterteil, ein damit ausgebildetes metallurgisches Gefäß sowie Elektrolichtbogenofen und Verfahren zu dessen Betrieb |
EP4311994A1 (de) | 2022-07-26 | 2024-01-31 | Primetals Technologies Austria GmbH | Metallurgisches gefäss mit einer abstichvorrichtung zum kontrollierten abstechen von flüssigem metall |
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DE102008008033A1 (de) | 2007-08-04 | 2009-02-05 | Sms Demag Ag | Einrichtung zum schlackenfreien Abstich oder zur Überführung einer Schmelze |
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CN102735066B (zh) * | 2012-06-14 | 2013-12-18 | 芜湖楚江合金铜材有限公司 | 潜流式通道机构及使用所述机构进行溶液流通控制的方法 |
DE102013219686A1 (de) | 2013-09-30 | 2015-04-02 | Siemens Vai Metals Technologies Gmbh | Gefäßunterteil, ein damit ausgebildetes metallurgisches Gefäß sowie Elektrolichtbogenofen und Verfahren zu dessen Betrieb |
WO2015043900A1 (de) * | 2013-09-30 | 2015-04-02 | Siemens Vai Metals Technologies Gmbh | Gefässunterteil, ein damit ausgebildetes metallurgisches gefäss sowie elektrolichtbogenofen und verfahren zu dessen betrieb |
DE102013219682A1 (de) | 2013-09-30 | 2015-04-02 | Siemens Vai Metals Technologies Gmbh | Gefäßunterteil, ein damit ausgebildetes metallurgisches Gefäß sowie Elektrolichtbogenofen und Verfahren zu dessen Betrieb |
WO2015043910A1 (de) | 2013-09-30 | 2015-04-02 | Siemens Vai Metals Technologies Gmbh | GEFÄßUNTERTEIL, EIN DAMIT AUSGEBILDETES METALLURGISCHES GEFÄß SOWIE ELEKTROLICHTBOGENOFEN UND VERFAHREN ZU DESSEN BETRIEB |
EP4311994A1 (de) | 2022-07-26 | 2024-01-31 | Primetals Technologies Austria GmbH | Metallurgisches gefäss mit einer abstichvorrichtung zum kontrollierten abstechen von flüssigem metall |
WO2024023095A1 (de) | 2022-07-26 | 2024-02-01 | Primetals Technologies Austria GmbH | Metallurgisches gefäss mit einer abstichvorrichtung zum kontrollierten abstechen von flüssigem metall |
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ATE246791T1 (de) | 2003-08-15 |
ES2204571T3 (es) | 2004-05-01 |
CZ20013496A3 (cs) | 2002-10-16 |
PL350411A1 (en) | 2002-12-02 |
AU763426B2 (en) | 2003-07-24 |
PL193887B1 (pl) | 2007-03-30 |
EA003075B1 (ru) | 2002-12-26 |
WO2000060297A1 (de) | 2000-10-12 |
JP2002541422A (ja) | 2002-12-03 |
EA200101018A1 (ru) | 2002-04-25 |
US6596221B1 (en) | 2003-07-22 |
CN1187566C (zh) | 2005-02-02 |
EP1181491A1 (de) | 2002-02-27 |
CZ297606B6 (cs) | 2007-02-07 |
CA2367997C (en) | 2007-01-09 |
CA2367997A1 (en) | 2000-10-12 |
BR0009479A (pt) | 2002-02-19 |
AU4397300A (en) | 2000-10-23 |
TR200102772T2 (tr) | 2002-04-22 |
MXPA01009780A (es) | 2002-05-14 |
CN1345409A (zh) | 2002-04-17 |
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