EP2698588A2 - Furnace for the removal of impurities from metal melts - Google Patents

Furnace for the removal of impurities from metal melts Download PDF

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Publication number
EP2698588A2
EP2698588A2 EP13180422.1A EP13180422A EP2698588A2 EP 2698588 A2 EP2698588 A2 EP 2698588A2 EP 13180422 A EP13180422 A EP 13180422A EP 2698588 A2 EP2698588 A2 EP 2698588A2
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EP
European Patent Office
Prior art keywords
furnace
furnace vessel
vessel
oven according
purge gas
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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.)
Granted
Application number
EP13180422.1A
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German (de)
French (fr)
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EP2698588A3 (en
EP2698588B1 (en
Inventor
Frank Dipl.-Ing. Jünger
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MKM Mansfelder Kupfer und Messing GmbH
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MKM Mansfelder Kupfer und Messing GmbH
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Publication of EP2698588A3 publication Critical patent/EP2698588A3/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
    • 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
    • F27B14/00—Crucible or pot furnaces
    • F27B14/02—Crucible or pot furnaces with tilting or rocking arrangements
    • 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
    • F27B14/00—Crucible or pot furnaces
    • F27B14/04—Crucible or pot furnaces adapted for treating the charge in vacuum or special atmosphere
    • 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
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details peculiar to crucible or pot furnaces
    • 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
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/02—Supplying steam, vapour, gases, or liquids

Definitions

  • the invention relates to a furnace for removing impurities from molten metal, preferably based on aluminum or copper, by means of purge gas.
  • metals such as e.g. Copper or aluminum
  • gases in particular hydrogen
  • the formation of undesirable inclusions in the melt In addition, it can lead to impurities of the melt.
  • the invention has for its object to provide a furnace for removing impurities from molten metal, preferably based on aluminum or copper, by means of purge gas, which is characterized by an improved purge gas treatment of the molten metal and is suitable for treating larger amounts of molten metal.
  • the heatable furnace vessel has an oven interior with a U-shaped cross-sectional shape.
  • the furnace vessel is arranged from a vertical starting position (90 ° position) about an axis of rotation in a horizontal position (0 ° position) and pivotable back into the starting position. It has on one of the two narrow sides an inlet or inlet opening for the molten metal to be supplied and on the other, opposite narrow side an outlet opening for the discharge of the purified molten metal. These two openings are equal to the rotational or pivot axis of the furnace vessel.
  • the furnace interior is in the starting position by means of at least one weir divided into two sections, wherein the weir in the lower region has a passage opening for the melt and extends in height at least over the axis of rotation of the furnace vessel addition.
  • a trough-shaped channel for the passage of the molten metal is disposed in the refractory lining, which is used when the furnace vessel is in the 0 ° position.
  • the bottom region of the furnace vessel means, such as purging stones or Spüllanzen, provided for supplying purge gas.
  • the cover or in the lid of the furnace vessel means for heating and degassing of the furnace are installed.
  • the oven can be used both in 90 ° position and in 0 ° position in continuous operation. In the 90 ° position, batch operation is also possible.
  • each purging plug or rinse lance is charged with a precisely defined amount of reaction gas.
  • the oven is rotated 90 ° clockwise, the U-shaped opening faces up and the bottom where the gas purging devices are installed points downwards.
  • the interior of the furnace is filled with molten metal up to the height of the outlet opening.
  • the furnace vessel fills up to this center line, on which the axis of rotation of the furnace vessel is located.
  • This relatively high level due to the U-shape of the furnace interior, allows a particularly efficient purge gas treatment, since the reaction gas supplied to the bottom must cover the melt surface a comparatively long distance through the melt.
  • an intensive mass transfer is ensured in order to bind or dissipate gas dissolved in the melt by means of reaction or inert gases (or floatable particles).
  • the furnace vessel is pivoted to the 0 ° position.
  • the furnace according to the invention is very suitable for continuously operated foundries, in which large quantities of molten metal per unit time must be treated continuously.
  • the reactive purge gas per unit time can be tailored to the amount of metal to be treated.
  • the advantage that a purge stone only ever reaches an optimum effect with a certain amount of purge gas can thus be used effectively.
  • When using several purging stones can be made via a cascade control a gradation in terms of the total amount of gas used. There are only so much purging stones treated with reactive gas, as are required for each amount of metal to be cleaned. The remaining flushing stones are charged with inert gas.
  • the furnace can also be used as a pure continuous furnace if, due to special conditions, a purge gas treatment is not required.
  • weirs In the oven interior, several weirs can be arranged, which divide the oven into a corresponding number of sections. Thus, e.g. be arranged in the furnace interior 3, 7 or 9 weirs. This divides the oven into 4, 8 or 10 sections. In each section at least one rinsing unit is arranged. This makes it possible to realize an increase in the amount of purge gas, whereby larger amounts of molten metal can be treated.
  • the furnace vessel for carrying out the pivoting movement (up to 110 ° about the longitudinal axis) with at least two semi-circular runners, which are supported on arranged in the top frame front and rear bearing rollers connected.
  • the bearing rollers are arranged at different distances to the mounting plane, such that in the operating state at 0'-position of the furnace vessel, the interior of the furnace can be completely emptied and at 90'-position of the furnace vessel, the level top is below the filling opening.
  • the inclination of the furnace vessel is about 10 to 15 °.
  • a plurality of hydraulic cylinders are arranged on the attachment frame, whose retractable and retractable piston rods are in communication with the furnace vessel.
  • a Notabstichö réelle can still be provided in order to empty the furnace in case of obstruction of the outlet pipe can.
  • the oven can be used both as a treatment and continuous furnace.
  • the switching time is very short (minutes).
  • the purge gas treatment of the melt takes place in a closed treatment room (no contact with the open atmosphere), whereby unwanted chemical reactions during treatment are avoided.
  • the novel furnace is particularly well-suited for providing molten metal from the smelting process for continuous casting processes (continuous casting, strip casting) in high quality.
  • the furnace may be used for any such molten metal requiring purge gas treatment, e.g. also for the removal of oxygen from copper to produce so-called "oxygen-free copper".
  • the new furnace is also characterized by a particularly economical operation, in comparison with known solutions, a saving of reaction or inert gas in the amount of about 10% is achieved for the same amount of treated metal. Due to the fastest possible conversion from continuous operation to purge gas operation in a short time (within minutes), the production costs can be further reduced.
  • the in the FIGS. 1 to 3 shown furnace consists of a cross-sectionally U-shaped furnace vessel 1 as a steel housing design with a refractory and insulating acting lining 2 based on mineral building materials.
  • the furnace vessel 1 has two parallel spaced longitudinal side walls 4 and 5, a semi-circular bottom part 6, two narrow side walls 7 and 8 (FIGS. Fig. 2 ) and a cover or lid 9.
  • the lockable lid 9 is also equipped with a refractory and insulating acting liner.
  • the furnace vessel 1 is connected to two semi-circular curved runners 10, which are supported on bearing rollers 11.
  • the bearing rollers are rotatably mounted in bearing blocks 12, which are connected to the attachment frame 13.
  • a respective hydraulic cylinder 14 On the narrow side walls following carriers of the top frame 13 is a respective hydraulic cylinder 14 ( Fig. 3 ), whose pistons 15 engage the adjacent narrow side wall 7 and 8 of the furnace vessel 1.
  • the furnace vessel 1 By operating the hydraulic cylinder 14, the furnace vessel 1 from the upright position (initial position, 90 ° position) ( Fig. 3 ) in a horizontal position (0 ° position) about the longitudinal or rotation axis 17 (FIG. Fig. 1 ) and back to starting position.
  • the 90 ° position (starting position) of the furnace vessel 1 is the working position and the 0 ° position, the flow position, ie the molten metal can flow through the furnace vessel 1 in the longitudinal direction.
  • the side wall 4 pointing in the 0 ° position, downwards, in the direction of the ground, or the refractory lining thereof, is provided with a channel-shaped channel 18, which runs slightly inclined in the direction of flow.
  • the molten metal flows in the direction of the outlet pipe 19, which is integrated on the narrow side 8 in the furnace vessel 1 is.
  • the inlet opening 29 for the molten metal is provided in the opposite narrow side 7 in the opposite narrow side 7 .
  • the furnace interior 3 of the furnace vessel 1 is by arrangement of a weir 20 (FIG. Fig. 2 ) made of refractory material in two sections 21 and 22 separately.
  • the weir 20 has on its underside a passage opening 23 for the supplied via the inlet opening 29 melt and extends in height slightly above the height of the axis of rotation 17 addition, so that in the working position of the furnace (90 ° position) no liquid metal over the weir can flow ( Fig. 2 ).
  • both before and after the weir 20 are in the oven floor 6 at least one sink 26, 27 or at least one rinse lance each embedded in the refractory masonry. So that in the operating state the purge gases introduced via the purge stones have sufficient time to rise in the melt, the perpendicular distance h (FIG. Fig. 1 ) between the top of the furnace floor 6 and the axis of rotation 17 at least one meter.
  • the lid 9 locked on the oven vessel 1 is equipped with two burners 24 and 25 for heating the oven vessel 1. Further, in the cover 9, an exhaust port 28 and other openings for introducing Spüllanzen and / or temperature sensors are provided, which are not shown in detail. In addition, an inspection opening is provided which can be closed with a cover 30 ( Fig. 2 ).
  • the cover 9 is attached to the furnace vessel 1 so that it does not change its position during the pivoting movement of the furnace vessel.
  • Each purging plug is charged with a defined amount of purge gas.
  • the pre-pressure of the purge gas must be higher than the maximum metallostatic pressure of the metal column in the furnace interior plus pressure loss of the purge stones or flushing lances. Purge gas flows into the molten metal only under these conditions.
  • the furnace vessel 1 is pivoted counterclockwise to the 0 ° position (continuous position) about the axis of rotation 17.
  • the cleaned molten metal now flows along the channel 18 in the direction of the outlet pipe 19, e.g. in a strip casting mold for the production of copper strip.
  • the furnace according to the invention is particularly well suited for a reducing treatment of liquid copper for a continuously operating continuous casting plant.
  • continuous operation 90 ° position
  • the furnace remains filled as long as the incoming melt, e.g. Copper melt, to be treated with reactive gas.
  • the treated copper melt runs continuously over the outlet pipe 19 and passes e.g. in a downstream continuous casting plant.
  • each purging plug can be acted upon separately with a defined amount of pure CO gas.
  • each purging plug can be purged with nitrogen instead of reactive gas.
  • the admission pressure for the gases is set, for example, to 3.5 bar.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Abstract

The furnace comprises a heatable furnace vessel (1) comprising an inner space (3) with a U-shaped cross-section. The furnace vessel: is pivoted from a vertical starting position (90[deg] -position), by an axis of rotation, to a horizontal position (0[deg] -position) and then is pivoted back to the starting position; comprises an inlet opening at one narrow side and an outlet opening at other narrow side; and is connected with two semi-circular blades that are supported on bearing rollers arranged on front and rear sides of a mounting frame (13). The furnace comprises a heatable furnace vessel (1) comprising an inner space (3) with a U-shaped cross-section. The furnace vessel: is pivoted from a vertical starting position (90[deg] -position), by an axis of rotation, to a horizontal position (0[deg] -position) and then is pivoted back to the starting position; comprises an inlet opening at one narrow side and an outlet opening at other narrow side; and is connected with two semi-circular blades that are supported on bearing rollers arranged on front and rear sides of a mounting frame (13). The outlet opening is arranged at a height of the rotational axis. The furnace inner space is divided into respective sections by weirs arranged in the starting position. The weir comprises a passage opening for melt at its bottom portion, and extends outside in its height over the rotational axis of the furnace vessel. A gutter-shaped channel, which is configured for the flow of the metal melts in the horizontal position of the furnace vessel, is arranged in an interior of the furnace along one of the longitudinal sides in a refractory lining. A unit for supplying purge gas is arranged in the bottom portion of the furnace vessel. The furnace is: continuously operable in 90[deg] -position and in 0[deg] -position; and effectively operable in 90[deg] -position in a batch process. A porous plug or a flushing lance is arranged in each of the furnace sections. The rotation axis of the furnace vessel is arranged at a distance of one meter to the lowest-lying point of the furnace inner space. An amount of purge gas supply, over the porous plugs or a water jet assistance, is adjustable by a cascade control. A reactive gas or an inert gas is used as the purge gas. Each of the front and rear bearing rollers (11) is arranged in different distances from a mounting plane such that, during the operation, the interior of the furnace is completely emptied at 0[deg] -position of the furnace vessel and a top filling level lies below a filling opening at 90[deg] -position. Hydraulic cylinders are disposed on the mounting frame for carrying out the pivoting movement of the furnace vessel, where extended and retracted piston rods of the mounting frame are connected to the furnace vessel. The gutter-shaped channel is arranged in side walls of the furnace vessel, and an emergency tap aperture is provided in the gutter-shaped channel. A unit for heating and degassing the furnace is provided in a lid (9) of the furnace vessel.

Description

Die Erfindung bezieht sich auf einen Ofen zur Entfernung von Verunreinigungen aus Metallschmelzen, vorzugsweise auf Basis von Aluminium oder Kupfer, mittels Spülgas.The invention relates to a furnace for removing impurities from molten metal, preferably based on aluminum or copper, by means of purge gas.

In Gießereibetrieben werden in Schmelzöfen Metalle, wie z.B. Kupfer oder Aluminium, aufgeschmolzen und die Schmelze anschließend durch Formgebung zu einem Halbzeug verarbeitet. Während des Aufschmelzens des Metalls kommt es zur Aufnahme von Gasen, insbesondere Wasserstoff, und zur Bildung von unerwünschten Einschlüssen in der Schmelze. Außerdem kann es zu Verunreinigungen der Schmelze kommen.In foundries, in furnaces, metals such as e.g. Copper or aluminum, melted and then processed the melt by shaping to a semi-finished product. During the melting of the metal, there is the absorption of gases, in particular hydrogen, and the formation of undesirable inclusions in the melt. In addition, it can lead to impurities of the melt.

Derartige Einschlüsse verursachen während Abkühlens der Schmelze zu einem Halbzeug Lunker bzw. poröse Stellen, die sich nachteilig auf die Qualität des Produktes auswirken. Zur Lösung dieses Problems ist es bereits bekannt, die Metallschmelze einer Spülgasbehandlung zu unterziehen, wobei Spülgas, z.B. Argon, in die Metallschmelze injiziert wird und die aufsteigenden Spülgasblasen in der Schmelze gelöste Gase absorbieren und sonstige in der Schmelze noch enthaltene Fremdstoffe an die Oberfläche gespült werden. Hierzu sind zur Spülgasbehandlung in einem zwischengeschalteten Ofen unterschiedliche Methoden bekannt, wobei beispielsweise auf die EP 1 132 487 B1 verwiesen wird.Such inclusions cause voids or porous spots during cooling of the melt to a semi-finished product, which adversely affect the quality of the product. To solve this problem, it is already known to subject the molten metal to a purge gas treatment, wherein purge gas, for example argon, is injected into the molten metal and the rising purge gas bubbles absorb dissolved gases in the melt and other foreign substances still contained in the melt are flushed to the surface , For this purpose, different methods are known for purge gas treatment in an intermediate furnace, for example, on the EP 1 132 487 B1 is referenced.

Der Nachteil bekannter Öfen ist, dass diese einen hohen Verbrauch an Spülgas (Spülgasmenge/t Metallschmelze) verursachen und in ihrer Kapazität eingeschränkt sind.The disadvantage of known ovens is that they cause a high consumption of purge gas (amount of purge gas / t molten metal) and are limited in their capacity.

Der Erfindung liegt die Aufgabe zugrunde, einen Ofen zur Entfernung von Verunreinigungen aus Metallschmelzen, vorzugsweise auf Basis von Aluminium oder Kupfer, mittels Spülgas zu schaffen, der sich durch eine verbesserte Spülgasbehandlung der Metallschmelze auszeichnet und für eine Behandlung größerer Mengen an Metallschmelze geeignet ist.The invention has for its object to provide a furnace for removing impurities from molten metal, preferably based on aluminum or copper, by means of purge gas, which is characterized by an improved purge gas treatment of the molten metal and is suitable for treating larger amounts of molten metal.

Erfindungsgemäß wird die Aufgabe durch die im Anspruch 1 angegebenen Merkmale gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen sind Gegenstand der Ansprüche 2 bis 13.According to the invention the object is achieved by the features specified in claim 1. Advantageous embodiments and further developments are the subject matter of claims 2 to 13.

Das beheizbare Ofengefäß besitzt einen Ofeninnenraum mit einer U-förmigen Querschnittsform. Das Ofengefäß ist von einer vertikalen Ausgangslage (90°-Stellung) um eine Drehachse in eine horizontale Lage (0°-Stellung) und wieder zurück in die Ausgangslage schwenkbar angeordnet. Es hat an einer der beiden Schmalseiten eine Eintritts- bzw. Einlassöffnung für die zuzuführende Metallschmelze und an der anderen, gegenüberliegenden Schmalseite eine Austrittsöffnung für die Abführung der gereinigten Metallschmelze. Diese beiden Öffnungen liegen in Höhe der Dreh- bzw. Schwenkachse des Ofengefäßes. Der Ofeninnenraum ist in Ausgangslage mittels mindestens eines angeordneten Wehres in zwei Abschnitte unterteilt, wobei das Wehr im unteren Bereich eine Durchtrittsöffnung für die Schmelze besitzt und sich in seiner Höhe mindestens über die Drehachse des Ofengefäßes hinaus erstreckt. Im Ofeninnenraum, entlang einer der sich in Längsrichtung erstreckenden Seitenwände, ist in der Feuerfestauskleidung ein rinnenförmiger Kanal für den Durchfluss der Metallschmelze angeordnet, der genutzt wird, wenn sich das Ofengefäß in 0°-Stellung befindet. Im Bodenbereich des Ofengefäßes sind Mittel, wie Spülsteine oder Spüllanzen, zur Zuführung von Spülgas vorgesehen. In der Abdeckung bzw. im Deckel des Ofengefäßes sind Mittel zur Beheizung und Entgasung des Ofens installiert.The heatable furnace vessel has an oven interior with a U-shaped cross-sectional shape. The furnace vessel is arranged from a vertical starting position (90 ° position) about an axis of rotation in a horizontal position (0 ° position) and pivotable back into the starting position. It has on one of the two narrow sides an inlet or inlet opening for the molten metal to be supplied and on the other, opposite narrow side an outlet opening for the discharge of the purified molten metal. These two openings are equal to the rotational or pivot axis of the furnace vessel. The furnace interior is in the starting position by means of at least one weir divided into two sections, wherein the weir in the lower region has a passage opening for the melt and extends in height at least over the axis of rotation of the furnace vessel addition. In the furnace interior, along one of the longitudinally extending side walls, a trough-shaped channel for the passage of the molten metal is disposed in the refractory lining, which is used when the furnace vessel is in the 0 ° position. In the bottom region of the furnace vessel means, such as purging stones or Spüllanzen, provided for supplying purge gas. In the cover or in the lid of the furnace vessel means for heating and degassing of the furnace are installed.

Der Ofen kann sowohl in 90°-Stellung als auch in 0°-Stellung im Durchlaufbetrieb genutzt werden. In der 90°-Stellung ist auch ein Chargenbetrieb möglich.The oven can be used both in 90 ° position and in 0 ° position in continuous operation. In the 90 ° position, batch operation is also possible.

Befindet sich der Ofen in der 0°-Stellung, so kann die Metallschmelze über den rinnenförmigen Kanal durch den Ofen hindurchfließen. Der rinnenförmige Kanal wirkt somit als Verbindung zwischen zwei benachbarten Öfen oder einem Ofen und der zugehörigen Gießanlage. Zur Behandlung der Metallschmelze wird jeder Spülstein oder jede Spüllanze mit einer genau definierten Menge an Reaktionsgas beaufschlagt. Wird der Ofen um 90° in Uhrzeigerrichtung gedreht, so zeigt die Öffnung der U-Form nach oben und der Boden, in dem die Gasspüleinrichtungen eingebaut sind, nach unten. Der Ofeninnenraum wird bis zur Höhe der Auslauföffnung mit Metallschmelze gefüllt.When the oven is in the 0 ° position, the molten metal can flow through the oven via the channel. The channel-shaped channel thus acts as a connection between two adjacent furnaces or a furnace and the associated casting plant. To treat the molten metal, each purging plug or rinse lance is charged with a precisely defined amount of reaction gas. When the oven is rotated 90 ° clockwise, the U-shaped opening faces up and the bottom where the gas purging devices are installed points downwards. The interior of the furnace is filled with molten metal up to the height of the outlet opening.

Da die Mittellinie zwischen Zulauf- und Auslauföffnung mindestens einen Meter oberhalb des Bodens angeordnet ist, füllt sich das Ofengefäß bis zu dieser Mittellinie, auf der auch die Drehachse des Ofengefäßes liegt. Dieser relativ hohe Füllstand, bedingt durch die U-Form des Ofeninnenraumes, ermöglicht eine besonders effiziente Spülgasbehandlung, da das am Boden zugeführte Reaktionsgas bis zur Oberfläche der Metallschmelze eine vergleichsweise lange Wegstrecke durch die Schmelze zurücklegen muss. Dadurch wird ein intensiver Stoffaustausch gewährleistet, um mittels Reaktions- oder Inertgasen in der Schmelze gelöstes Gas (oder flotierbare Partikel) zu binden bzw. abzuführen.Since the center line between the inlet and outlet openings is arranged at least one meter above the floor, the furnace vessel fills up to this center line, on which the axis of rotation of the furnace vessel is located. This relatively high level, due to the U-shape of the furnace interior, allows a particularly efficient purge gas treatment, since the reaction gas supplied to the bottom must cover the melt surface a comparatively long distance through the melt. As a result, an intensive mass transfer is ensured in order to bind or dissipate gas dissolved in the melt by means of reaction or inert gases (or floatable particles).

Soll die Behandlung der Schmelze mit Spülgas beendet werden, so wird das Ofengefäß in die 0°-Stellung geschwenkt.If the treatment of the melt to be stopped with purge gas, the furnace vessel is pivoted to the 0 ° position.

Der erfindungsgemäße Ofen eignet sich sehr gut für kontinuierlich betriebene Gießereien, in denen große Mengen an Metallschmelze pro Zeiteinheit kontinuierlich behandelt werden müssen. Über die Anzahl der Spülsteine, die im Ofen eingebaut werden, kann die reaktive Spülgasmenge pro Zeiteinheit gezielt auf die zu behandelnde Metallmenge abgestimmt werden. Der Vorteil, dass ein Spülstein immer nur bei einer bestimmten Menge an Spülgas eine optimale Wirkung erreicht, kann so effektiv genutzt werden. Bei Verwendung mehrerer Spülsteine kann über eine Kaskadensteuerung eine Abstufung hinsichtlich der eingesetzten Gesamtgasmenge vorgenommen werden. Dabei werden nur so viel Spülsteine mit Reaktivgas beaufschlagt, wie für die jeweils zu reinigende Metallmenge erforderlich sind. Die restlichen Spülsteine werden mit Inertgas beaufschlagt.The furnace according to the invention is very suitable for continuously operated foundries, in which large quantities of molten metal per unit time must be treated continuously. About the number of purging bricks, which are installed in the oven, the reactive purge gas per unit time can be tailored to the amount of metal to be treated. The advantage that a purge stone only ever reaches an optimum effect with a certain amount of purge gas can thus be used effectively. When using several purging stones can be made via a cascade control a gradation in terms of the total amount of gas used. There are only so much purging stones treated with reactive gas, as are required for each amount of metal to be cleaned. The remaining flushing stones are charged with inert gas.

Der Ofen kann auch als reiner Durchlaufofen genutzt werden, wenn aufgrund spezieller Bedingungen eine Spülgasbehandlung nicht erforderlich ist.The furnace can also be used as a pure continuous furnace if, due to special conditions, a purge gas treatment is not required.

Im Ofeninnenraum können auch mehrere Wehre angeordnet sein, die den Ofen in eine entsprechende Anzahl an Abschnitten unterteilen. So können z.B. im Ofeninnenraum 3, 7 oder 9 Wehre angeordnet sein. Damit wird der Ofen in 4, 8 bzw. 10 Abschnitte unterteilt. In jedem Abschnitt ist mindestens eine Spüleinheit angeordnet. Damit lässt sich eine Erhöhung der Spülgasmenge realisieren, wodurch größere Mengen an Metallschmelze behandelt werden können.In the oven interior, several weirs can be arranged, which divide the oven into a corresponding number of sections. Thus, e.g. be arranged in the furnace interior 3, 7 or 9 weirs. This divides the oven into 4, 8 or 10 sections. In each section at least one rinsing unit is arranged. This makes it possible to realize an increase in the amount of purge gas, whereby larger amounts of molten metal can be treated.

Vorzugsweise ist das Ofengefäß zur Ausführung der Schwenkbewegung (bis zu 110° um die Längsachse) mit mindestens zwei halbkreisförmigen Kufen, die auf im Aufsatzrahmen angeordnete vordere und hintere Lagerrollen abgestützt sind, verbunden. Die Lagerrollen sind in unterschiedlichen Abständen zur Aufstellebene angeordnet, derart, dass im Betriebszustand bei 0'-Stellung des Ofengefäßes der Ofeninnenraum vollständig entleert werden kann und bei 90'-Stellung des Ofengefäßes die Füllstandsoberkante unterhalb der Einfüllöffnung liegt. Die Neigung des Ofengefäßes beträgt in etwa 10 bis 15°.Preferably, the furnace vessel for carrying out the pivoting movement (up to 110 ° about the longitudinal axis) with at least two semi-circular runners, which are supported on arranged in the top frame front and rear bearing rollers connected. The bearing rollers are arranged at different distances to the mounting plane, such that in the operating state at 0'-position of the furnace vessel, the interior of the furnace can be completely emptied and at 90'-position of the furnace vessel, the level top is below the filling opening. The inclination of the furnace vessel is about 10 to 15 °.

Zur Realisierung der Schwenkbewegung des Ofengefäßes sind mehrere Hydraulikzylinder am Aufsatzrahmen angeordnet, deren aus- und einfahrbare Kolbenstangen mit dem Ofengefäß in Verbindung stehen.To realize the pivoting movement of the furnace vessel, a plurality of hydraulic cylinders are arranged on the attachment frame, whose retractable and retractable piston rods are in communication with the furnace vessel.

In der Seitenwand des Ofengefäßes, in der sich der rinnenförmige Kanal befindet, kann noch eine Notabstichöffnung vorgesehen sein, um im Falle einer Verstopfung des Auslaufrohres den Ofen entleeren zu können.In the side wall of the furnace vessel, in which the channel-shaped channel is located, a Notabstichöffnung can still be provided in order to empty the furnace in case of obstruction of the outlet pipe can.

Der Ofen kann sowohl als Behandlungs- als auch als Durchlaufofen genutzt werden. Die Umschaltzeit ist dabei sehr kurz (Minuten).The oven can be used both as a treatment and continuous furnace. The switching time is very short (minutes).

Von Vorteil ist, dass aufgrund der U-förmigen Bauweise des Ofeninnenraumes eine wirksame Spülgasbehandlung ohne zusätzliche Hilfsmittel, wie z.B. Rotoren, ermöglicht wird. Der Verschleiß der feuerfesten Auskleidung des Ofens während des Spülgasbetriebes ist vergleichsweise sehr gering.It is advantageous that due to the U-shaped design of the furnace interior effective Spülgasbehandlung without additional aids, such as. Rotors, is made possible. The wear of the refractory lining of the furnace during Spülgasbetriebes is comparatively very low.

Die Spülgasbehandlung der Schmelze erfolgt in einem abgeschlossenen Behandlungsraum (kein Kontakt zur offenen Atmosphäre), wodurch unerwünschte chemische Reaktionen während der Behandlung vermieden werden.The purge gas treatment of the melt takes place in a closed treatment room (no contact with the open atmosphere), whereby unwanted chemical reactions during treatment are avoided.

Der neuartige Ofen ist besonders gut geeignet, um aus dem Schmelzprozess kommende Metallschmelze für kontinuierliche Gießverfahren (Strangguss, Bandguss) in hoher Qualität bereitzustellen.The novel furnace is particularly well-suited for providing molten metal from the smelting process for continuous casting processes (continuous casting, strip casting) in high quality.

Der Ofen kann für alle solche Metallschmelzen eingesetzt werden, die eine Spülgasbehandlung erfordern, z.B. auch zur Entfernung von Sauerstoff aus Kupfer zur Erzeugung von sogenanntem "sauerstofffreien Kupfer".The furnace may be used for any such molten metal requiring purge gas treatment, e.g. also for the removal of oxygen from copper to produce so-called "oxygen-free copper".

Der neue Ofen zeichnet sich auch durch eine besonders ökonomische Betriebsweise aus, im Vergleich zu bekannten Lösungen wird für die gleiche Menge an behandeltem Metall eine Einsparung an Reaktions- bzw. Inertgas in Höhe von etwa 10% erzielt. Durch die möglichst schnelle Umstellung von Durchlaufbetrieb auf Spülgasbetrieb in kurzer Zeit (innerhalb von Minuten) lassen sich die Produktionskosten zusätzlich noch senken.The new furnace is also characterized by a particularly economical operation, in comparison with known solutions, a saving of reaction or inert gas in the amount of about 10% is achieved for the same amount of treated metal. Due to the fastest possible conversion from continuous operation to purge gas operation in a short time (within minutes), the production costs can be further reduced.

Die Erfindung soll nachstehend an einem Ausführungsbeispiel näher erläutert werden. In der zugehörigen Zeichnung zeigen

  • Fig. 1 den erfindungsgemäßen Ofen in 90°-Stellung als Querschnittsdarstellung gemäß der Linie B-B in Fig. 2,
  • Fig. 2 einen Schnitt gemäß der Linie A-A in Fig. 1 und
  • Fig. 3 eine Rückansicht des Ofens.
The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawing show
  • Fig. 1 the furnace according to the invention in a 90 ° position as a cross-sectional view along the line BB in Fig. 2 .
  • Fig. 2 a section along the line AA in Fig. 1 and
  • Fig. 3 a rear view of the oven.

Der in den Figuren 1 bis 3 gezeigte Ofen besteht aus einem im Querschnitt U-förmigen Ofengefäß 1 als Stahlgehäuseausführung mit einer feuerfesten und isolierend wirkenden Auskleidung 2 auf Basis mineralischer Baustoffe. Das Ofengefäß 1 hat zwei parallel beabstandete Längsseitenwände 4 und 5, ein halbkreisförmiges Bodenteil 6, zwei Schmalseitenwände 7 und 8 (Fig. 2) und eine Abdeckung bzw. Deckel 9. Der verriegelbare Deckel 9 ist ebenfalls mit einer feuerfesten und isolierend wirkenden Auskleidung ausgerüstet. Das Ofengefäß 1 ist mit zwei halbkreisförmig gebogenen Kufen 10 verbunden, die auf Lagerrollen 11 abgestützt sind. Die Lagerrollen sind in Lagerböcken 12 drehbar gelagert, die mit dem Aufsatzrahmen 13 verbunden sind.The in the FIGS. 1 to 3 shown furnace consists of a cross-sectionally U-shaped furnace vessel 1 as a steel housing design with a refractory and insulating acting lining 2 based on mineral building materials. The furnace vessel 1 has two parallel spaced longitudinal side walls 4 and 5, a semi-circular bottom part 6, two narrow side walls 7 and 8 (FIGS. Fig. 2 ) and a cover or lid 9. The lockable lid 9 is also equipped with a refractory and insulating acting liner. The furnace vessel 1 is connected to two semi-circular curved runners 10, which are supported on bearing rollers 11. The bearing rollers are rotatably mounted in bearing blocks 12, which are connected to the attachment frame 13.

An der den Schmalseitenwänden folgenden Trägern des Aufsatzrahmens 13 ist jeweils ein Hydraulikzylinder 14 (Fig. 3) befestigt, deren Kolben 15 an der benachbarten Schmalseitenwand 7 und 8 des Ofengefäßes 1 angreifen.On the narrow side walls following carriers of the top frame 13 is a respective hydraulic cylinder 14 ( Fig. 3 ), whose pistons 15 engage the adjacent narrow side wall 7 and 8 of the furnace vessel 1.

Durch Betätigung der Hydraulikzylinder 14 kann das Ofengefäß 1 von der aufrechten Lage (Ausgangslage, 90°-Stellung) (Fig. 3) in eine horizontale Lage (0°-Stellung) um die Längs- bzw. Drehachse 17 (Fig. 1) geschwenkt werden und wieder zurück in Ausgangslage. Die 90°-Stellung (Ausgangsstellung) des Ofengefäßes 1 ist die Arbeitsstellung und die 0°-Stellung die Durchlaufstellung, d.h. die Metallschmelze kann in Längsrichtung durch das Ofengefäß 1 hindurchfließen.By operating the hydraulic cylinder 14, the furnace vessel 1 from the upright position (initial position, 90 ° position) ( Fig. 3 ) in a horizontal position (0 ° position) about the longitudinal or rotation axis 17 (FIG. Fig. 1 ) and back to starting position. The 90 ° position (starting position) of the furnace vessel 1 is the working position and the 0 ° position, the flow position, ie the molten metal can flow through the furnace vessel 1 in the longitudinal direction.

Hierzu ist die in 0°-Stellung, nach unten, in Bodenrichtung zeigende Seitenwand 4 bzw. deren Feuerfestverkleidung mit einem in Strömungsrichtung leicht geneigt verlaufenden, rinnenförmigen Kanal 18 versehen. Über den rinnenförmigen Kanal 18 strömt die Metallschmelze in Richtung Auslaufrohr 19, das an der Schmalseite 8 in das Ofengefäß 1 eingebunden ist. In der gegenüberliegenden Schmalseite 7 befindet sich die Eintrittsöffnung 29 für die Metallschmelze.For this purpose, the side wall 4 pointing in the 0 ° position, downwards, in the direction of the ground, or the refractory lining thereof, is provided with a channel-shaped channel 18, which runs slightly inclined in the direction of flow. About the channel-shaped channel 18, the molten metal flows in the direction of the outlet pipe 19, which is integrated on the narrow side 8 in the furnace vessel 1 is. In the opposite narrow side 7 is the inlet opening 29 for the molten metal.

Der Ofeninnenraum 3 des Ofengefäßes 1 ist durch Anordnung eines Wehres 20 (Fig. 2) aus feuerfestem Material in zwei Abschnitte 21 und 22 getrennt.The furnace interior 3 of the furnace vessel 1 is by arrangement of a weir 20 (FIG. Fig. 2 ) made of refractory material in two sections 21 and 22 separately.

Das Wehr 20 besitzt an seiner Unterseite eine Durchtrittöffnung 23 für die über die Eintrittsöffnung 29 zugeführte Schmelze und erstreckt sich in seiner Höhe geringfügig bis über die Höhe der Drehachse 17 hinaus, sodass in Arbeitsstellung des Ofens (90°-Stellung) kein Flüssigmetall über das Wehr strömen kann (Fig. 2).The weir 20 has on its underside a passage opening 23 for the supplied via the inlet opening 29 melt and extends in height slightly above the height of the axis of rotation 17 addition, so that in the working position of the furnace (90 ° position) no liquid metal over the weir can flow ( Fig. 2 ).

Sowohl vor als auch nach dem Wehr 20 sind im Ofenboden 6 mindestens jeweils ein Spülstein 26, 27 oder mindestens je eine Spülerlanze in das feuerfeste Mauerwerk eingelassen. Damit im Betriebszustand die über die Spülsteine eingetragenen Spülgase genügend Zeit haben in der Schmelze aufzusteigen, beträgt der lotrechte Abstand h (Fig. 1) zwischen Oberseite Ofenboden 6 und Drehachse 17 mindestens einen Meter.Both before and after the weir 20 are in the oven floor 6 at least one sink 26, 27 or at least one rinse lance each embedded in the refractory masonry. So that in the operating state the purge gases introduced via the purge stones have sufficient time to rise in the melt, the perpendicular distance h (FIG. Fig. 1 ) between the top of the furnace floor 6 and the axis of rotation 17 at least one meter.

Der auf dem Ofengefäß 1 arretierte Deckel 9 ist mit zwei Brennern 24 und 25 zum Beheizen des Ofengefäßes 1 ausgerüstet. Ferner sind im Deckel 9 eine Abgasöffnung 28 sowie weitere Öffnungen zum Einbringen von Spüllanzen und/oder Temperaturfühlern vorgesehen, die nicht näher gezeigt sind. Außerdem ist noch eine Inspektionsöffnung vorgesehen, die mit einem Deckel 30 verschließbar ist (Fig. 2).The lid 9 locked on the oven vessel 1 is equipped with two burners 24 and 25 for heating the oven vessel 1. Further, in the cover 9, an exhaust port 28 and other openings for introducing Spüllanzen and / or temperature sensors are provided, which are not shown in detail. In addition, an inspection opening is provided which can be closed with a cover 30 ( Fig. 2 ).

Der Deckel 9 ist am Ofengefäß 1 so befestigt, dass er während der Schwenkbewegung des Ofengefäßes seine Lage nicht verändert.The cover 9 is attached to the furnace vessel 1 so that it does not change its position during the pivoting movement of the furnace vessel.

Um das Ofengefäß 1 ist ein begehbarer Laufsteg bzw. eine Bühne 16 angeordnet (Fig. 1). Die Funktionsweise des Ofens ist wie folgt:

  • Zur Behandlung der Metallschmelze bzw. zur Entfernung von Verunreinigungen befindet sich der Ofen in der 90°-Stellung (Figuren 1 und 2). Über die Einlassöffnung 29 fließt Metallschmelze in den ersten Abschnitt 21 des Ofeninnenraumes 3 und gelangt über die Durchtrittsöffnung 23 in den zweiten Abschnitt 22. Der Ofeninnenraum wird bis zu einem Füllstand in Höhe des Auslaufrohres 8 mit Metallschmelze gefüllt.
To the furnace vessel 1, a walk-in walkway or a stage 16 is arranged ( Fig. 1 ). The functioning of the stove is as follows:
  • For the treatment of molten metal or for the removal of impurities, the furnace is in the 90 ° position ( FIGS. 1 and 2 ). Via the inlet opening 29 molten metal flows into the first portion 21 of the furnace interior 3 and passes through the passage opening 23 in the second section 22. The furnace interior is filled up to a level at the level of the outlet pipe 8 with molten metal.

Während des Füllvorganges mit Metallschmelze wird bereits mit der Zuführung von Spülgas über die Spülsteine 26, 27 bzw. Spüllanzen begonnen.During the filling process with molten metal is already started with the supply of purge gas through the purge stones 26, 27 and Spüllanzen.

Jeder Spülstein wird mit einer definierten Menge an Spülgas beaufschlagt. Der Vordruck des Spülgases muss höher sein als der maximale metallostatische Druck der Metallsäule im Ofeninnenraum plus Druckverlust der Spülsteine oder Spüllanzen. Nur unter diesen Bedingungen strömt Spülgas in die Metallschmelze.Each purging plug is charged with a defined amount of purge gas. The pre-pressure of the purge gas must be higher than the maximum metallostatic pressure of the metal column in the furnace interior plus pressure loss of the purge stones or flushing lances. Purge gas flows into the molten metal only under these conditions.

Aufgrund der U-förmigen Ofenkonstruktion benötigt das in Bodennähe in die Metallschmelze eingetragene Reaktivgas einen relativ langen Strömungsweg bis zur Metallbadoberfläche. Das hat sich als entscheidender Vorteil herausgestellt, da somit ein besonders wirksamer Stoffaustausch zwischen Spülgas und in der Schmelze in gelöster Form vorliegendem Gas stattfinden kann und dabei gleichzeitig in der Schmelze noch vorhandene flotierbare Partikel bzw. Verunreinigungen ausgetrieben werden.Due to the U-shaped furnace construction, the reactive gas introduced near the bottom of the molten metal requires a relatively long flow path up to the metal bath surface. That turned out to be a decisive advantage, since thus a particularly Effective mass transfer can take place between purge gas and gas present in dissolved form in the melt and, at the same time, floatable particles or impurities still present in the melt are expelled.

Zum Ende der Spülgasbehandlung wird das Ofengefäß 1 entgegen der Uhrzeigerrichtung in die 0°-Stelllung (Durchlaufstellung) um die Drehachse 17 geschwenkt. Die gereinigte Metallschmelze fließt nunmehr entlang der Rinne 18 in Richtung Auslaufrohr 19 ab, z.B. in eine Bandgießkokille zur Herstellung von Kupferband.At the end of the purge gas treatment, the furnace vessel 1 is pivoted counterclockwise to the 0 ° position (continuous position) about the axis of rotation 17. The cleaned molten metal now flows along the channel 18 in the direction of the outlet pipe 19, e.g. in a strip casting mold for the production of copper strip.

Wenn alle im Ofen befindliche Metallschmelze abgeflossen ist, wird die Spülgaszufuhr unterbrochen. Anschließend kann der Ofen wieder in seine Ausgangslage (90°-Stellung) bewegt mit einem neuen Behandlungszyklus begonnen werden. Die Schwenkbewegung des Ofens in seine Ausgangslage (90°-Stellung) ist durch einen Endanschlag 31 begrenzt.When all molten metal in the furnace has drained off, the purge gas supply is interrupted. Subsequently, the oven can be moved back to its original position (90 ° position) with a new treatment cycle. The pivoting movement of the furnace to its initial position (90 ° position) is limited by an end stop 31.

Der erfindungsgemäße Ofen ist besonders gut für eine reduzierende Behandlung von Flüssigkupfer für eine kontinuierlich arbeitende Stranggussanlage geeignet. In diesem Fall (Durchlaufbetrieb, 90°-Stellung) bleibt der Ofen solange gefüllt, wie die zulaufende Schmelze, z.B. Kupferschmelze, mit Reaktivgas behandelt werden soll. Die behandelte Kupferschmelze läuft kontinuierlich über das Auslaufrohr 19 ab und gelangt z.B. in eine nachgeschaltete Stranggussanlage.The furnace according to the invention is particularly well suited for a reducing treatment of liquid copper for a continuously operating continuous casting plant. In this case (continuous operation, 90 ° position) the furnace remains filled as long as the incoming melt, e.g. Copper melt, to be treated with reactive gas. The treated copper melt runs continuously over the outlet pipe 19 and passes e.g. in a downstream continuous casting plant.

Bei einer Ausrüstung des Ofens mit sieben Spülsteinen im Ofenboden lassen sich sehr gute Ergebnisse erzielen.By equipping the oven with seven sinks in the bottom of the oven, very good results can be achieved.

Zur Spülgasversorgung sind eine Gasdruckregelstation und eine Mengensteuerung vorgesehen, wobei jeder Spülstein separat mit einer definierten Menge an reinem CO-Gas beaufschlagbar ist. In der Arbeitsstellung (90°-Stellung) und während des Durchlaufbetriebes (0°-Stellung) kann jeder Spülstein anstatt mit Reaktivgas mit Stickstoff gespült werden. Der Vordruck für die Gase wird beispielsweise auf 3,5 bar eingestellt.For purge gas supply a gas pressure control station and a flow control are provided, each purging plug can be acted upon separately with a defined amount of pure CO gas. In the working position (90 ° position) and during the continuous operation (0 ° position), each purging plug can be purged with nitrogen instead of reactive gas. The admission pressure for the gases is set, for example, to 3.5 bar.

Bei einer Ausrüstung des Ofens mit sieben Spülsteinen im Ofenboden lassen sich sehr gute Ergebnisse erzielen.By equipping the oven with seven sinks in the bottom of the oven, very good results can be achieved.

Unter kontinuierlicher Zufuhr von Reaktivgas lassen sich folgende Ergebnisse erzielen:

  • Behandlung von 55 t/h Kupferschmelze (Cu PHC)
  • Vier Spülsteine, Spülgas 100% CO
  • Sauerstoffgehalt des einfließenden Kupfers: 60-80 ppm
  • Sauerstoffgehalt des ausfließenden Kupfers: 30-40 ppm.
  • Behandlung von 55 t/h Kupferschmelze (Cu OFHC)
  • Sieben Spülsteine, Spülgas 100% CO
  • Sauerstoffgehalt des einfließenden Kupfers: 60-80 ppm
  • Sauerstoffgehalt des ausfließenden Kupfers: <10 ppm.
With continuous supply of reactive gas, the following results can be achieved:
  • Treatment of 55 t / h molten copper (Cu PHC)
  • Four purging stones, purge gas 100% CO
  • Oxygen content of the incoming copper: 60-80 ppm
  • Oxygen content of the effluent copper: 30-40 ppm.
  • Treatment of 55 t / h copper melt (Cu OFHC)
  • Seven purging stones, purge gas 100% CO
  • Oxygen content of the incoming copper: 60-80 ppm
  • Oxygen content of the effluent copper: <10 ppm.

Claims (13)

Ofen zur Entfernung von Verunreinigungen aus Metallschmelzen, vorzugsweise auf Basis von Aluminium oder Kupfer, wobei das beheizbare Ofengefäß (1) mit einer Feuerfestauskleidung ausgerüstet ist, eine U-förmige Querschnittsform besitzt sowie einen Ofeninnenraum (3) und das Ofengefäß (1) von einer vertikalen Ausgangslage (90°-Stellung) um eine Drehachse (17) in eine horizontale Lage (0°-Stellung) und wieder zurück in die Ausgangslage schwenkbar angeordnet ist, das Ofengefäß (1) an einer der beiden Schmalseiten (7) eine Eintrittsöffnung (29) und an der anderen, gegenüberliegenden Schmalseite (8) eine Austrittsöffnung (19) für die gereinigte Metallschmelze besitzt, die in Höhe der Drehachse (17) angeordnet sind, und der Ofeninnenraum (3) in Ausgangslage mittels mindestens eines angeordneten Wehres (20) in zwei Abschnitte (21, 22) unterteilt ist, wobei das Wehr (20) im unteren Bereich eine Durchtrittsöffnung (23) für Schmelze besitzt und sich in seiner Höhe mindestens über die Drehachse (17) des Ofengefäßes (1) hinaus erstreckt, und im Ofeninnenraum (3), entlang einer der Längsseiten (4), in der Feuerfestauskleidung (2) ein rinnenförmiger Kanal (18) für den Durchfluss der Metallschmelze bei horizontaler Lage des Ofengefäßes (1) angeordnet ist, und in Ausgangslage des Ofengefäßes (1) mindestens im Bodenbereich Mittel (26, 27) zur Zuführung von Spülgas angeordnet sind.Furnace for removing impurities from molten metal, preferably based on aluminum or copper, wherein the heatable furnace vessel (1) is equipped with a refractory lining, has a U-shaped cross-sectional shape and a furnace interior (3) and the furnace vessel (1) of a vertical Starting position (90 ° position) about an axis of rotation (17) in a horizontal position (0 ° position) and back to the starting position is pivotally mounted, the furnace vessel (1) on one of the two narrow sides (7) has an inlet opening (29 ) and on the other, opposite narrow side (8) has an outlet opening (19) for the purified molten metal, which are arranged at the level of the axis of rotation (17), and the furnace interior (3) in the initial position by means of at least one weir (20) arranged in two sections (21, 22) is divided, wherein the weir (20) in the lower region has a passage opening (23) for melt and at least over its height he the rotation axis (17) of the furnace vessel (1) extends out, and in the furnace interior (3), along one of the longitudinal sides (4), in the refractory lining (2) a channel-shaped channel (18) for the flow of the molten metal in a horizontal position of the Furnace vessel (1) is arranged, and in the initial position of the furnace vessel (1) at least in the bottom region means (26, 27) are arranged for supplying purge gas. Ofen nach Anspruch 1, dadurch gekennzeichnet, dass dieser sowohl in 90°-Stellung als auch in 0°-Stellung im Durchlaufbetrieb nutzbar ist.Oven according to claim 1, characterized in that it can be used in continuous operation both in the 90 ° position and in the 0 ° position. Ofen nach Anspruch 1, dadurch gekennzeichnet, dass dieser in 90°-Stellung im Chargenbetrieb nutzbar ist.Oven according to claim 1, characterized in that it can be used in the 90 ° position in batch mode. Ofen nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass im Ofeninnenraum (3) mehrere Wehre (20) angeordnet sind, die den Ofen in entsprechende Abschnitte unterteilen.Oven according to one of claims 1 to 3, characterized in that in the oven interior (3) a plurality of weirs (20) are arranged, which divide the oven into corresponding sections. Ofen nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass in jedem der Ofenabschnitte (21, 22) mindestens ein Spülstein (26, 27) oder eine Spüllanze angeordnet ist.Oven according to one of claims 1 to 4, characterized in that in each of the furnace sections (21, 22) at least one purging plug (26, 27) or a Spüllanze is arranged. Ofen nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Drehachse (17) des Ofengefäßes (1) mindestens in einem Abstand von einem Meter zur tiefstgelegenen Stelle des Ofeninnenraumes (3) angeordnet ist, bei Stellung des Ofengefäßes in Ausgangslage (90°-Stellung).Oven according to one of claims 1 to 5, characterized in that the axis of rotation (17) of the furnace vessel (1) is arranged at least at a distance of one meter to the lowest point of the furnace interior (3), in position of the furnace vessel in the starting position (90 ° -Position). Ofen nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Menge der Spülgaszuführung über die Spülsteine oder Spüllanzen mittels einer Kaskadensteuerung regelbar ist.Oven according to one of claims 1 to 6, characterized in that the amount of purge gas supply via the purge stones or Spüllanzen is controllable by means of a cascade control. Ofen nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass als Spülgas eine Reaktivgas oder ein Inertgas einsetzbar ist.Furnace according to one of claims 1 to 7, characterized in that a reactive gas or an inert gas can be used as purge gas. Ofen nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass das Ofengefäß (1) mit mindestens zwei halbkreisförmigen Kufen (10), die auf im Aufsatzrahmen (13) angeordnete vordere und hintere Lagerrollen (11) abgestützt sind, verbunden ist.Oven according to one of claims 1 to 8, characterized in that the furnace vessel (1) with at least two semicircular runners (10) which are supported on in the attachment frame (13) arranged front and rear bearing rollers (11) is connected. Ofen nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass jeweils die vorderen und hinteren Lagerrollen (11) in unterschiedlichen Abständen zur Aufstellebene angeordnet sind, derart, dass im Betriebszustand bei 0°-Stellung des Ofengefäßes (1) der Ofeninnenraum (3) vollständig entleerbar ist und bei 90°-Stellung die Füllstandsoberkante unterhalb der Einfüllöffnung (29) liegt.Oven according to one of claims 1 to 9, characterized in that in each case the front and rear bearing rollers (11) are arranged at different distances to the mounting plane, such that in the operating state at 0 ° position of the furnace vessel (1) of the furnace interior (3) is completely emptied and at 90 ° position, the upper level edge below the filling opening (29). Ofen nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass zur Ausführung der Schwenkbewegung des Ofengefäßes (1) mehrere Hydraulikzylinder (14) am Aufsatzrahmen (13) angeordnet sind, deren aus- und einfahrbare Kolbenstangen (15) mit dem Ofengefäß (1) in Verbindung stehen.Oven according to one of claims 1 to 10, characterized in that for carrying out the pivoting movement of the furnace vessel (1) a plurality of hydraulic cylinders (14) on the attachment frame (13) are arranged, the extendable and retractable piston rods (15) with the furnace vessel (1). keep in touch. Ofen nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass in der Seitenwand (4) des Ofengefäßes (1), in der der rinnenförmige Kanal (18) angeordnet ist, eine Notabstichöffnung vorgesehen ist.Oven according to one of claims 1 to 11, characterized in that in the side wall (4) of the furnace vessel (1), in which the channel-shaped channel (18) is arranged, a Notabstichöffnung is provided. Ofen nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, dass in der Abdeckung (9) des Ofengefäßes (1) Mittel zur Beheizung (24, 25) und Entgasung des Ofens vorgesehen sind.Oven according to one of claims 1 to 12, characterized in that in the cover (9) of the furnace vessel (1) means for heating (24, 25) and degassing of the furnace are provided.
EP13180422.1A 2012-08-15 2013-08-14 Furnace for the removal of impurities from metal melts Active EP2698588B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106643153A (en) * 2016-12-15 2017-05-10 天津鑫胜宏塔新材料科技有限公司 Ignition regulating system for special copper-melting furnace

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2910651A1 (en) 2014-02-19 2015-08-26 Siemens VAI Metals Technologies GmbH Method for the circulation of a metal bath and furnace construction
CN106885467A (en) * 2017-04-17 2017-06-23 四川科星药业有限公司 A kind of silicon steel post electric induction furnace of easy-unloading
CN108645211A (en) * 2018-07-13 2018-10-12 南通高新工业炉有限公司 A kind of Dumpage type gas crucible melting furnace

Citations (1)

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Publication number Priority date Publication date Assignee Title
EP1132487B1 (en) 1994-02-04 2003-05-02 Alcan International Limited Gas treatment of molten metals

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DE10340087B4 (en) * 2003-08-30 2006-11-02 Maerz-Gautschi Industrieofenanlagen Gmbh industrial furnace

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
EP1132487B1 (en) 1994-02-04 2003-05-02 Alcan International Limited Gas treatment of molten metals

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106643153A (en) * 2016-12-15 2017-05-10 天津鑫胜宏塔新材料科技有限公司 Ignition regulating system for special copper-melting furnace
CN106643153B (en) * 2016-12-15 2019-04-02 天津鑫胜宏塔新材料科技有限公司 A kind of dedicated furnace igniting regulating system of molten copper

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