DE19747002A1 - Three-chamber magnesium melting furnace - Google Patents

Three-chamber magnesium melting furnace

Info

Publication number
DE19747002A1
DE19747002A1 DE1997147002 DE19747002A DE19747002A1 DE 19747002 A1 DE19747002 A1 DE 19747002A1 DE 1997147002 DE1997147002 DE 1997147002 DE 19747002 A DE19747002 A DE 19747002A DE 19747002 A1 DE19747002 A1 DE 19747002A1
Authority
DE
Germany
Prior art keywords
chamber
melt
melting furnace
chambers
magnesium
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.)
Granted
Application number
DE1997147002
Other languages
German (de)
Other versions
DE19747002C2 (en
Inventor
Germann Dipl Ing Buck
Martin Mayr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Audi AG
Original Assignee
Audi AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Audi AG filed Critical Audi AG
Priority to DE1997147002 priority Critical patent/DE19747002C2/en
Publication of DE19747002A1 publication Critical patent/DE19747002A1/en
Application granted granted Critical
Publication of DE19747002C2 publication Critical patent/DE19747002C2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
    • C22B26/20—Obtaining alkaline earth metals or magnesium
    • C22B26/22—Obtaining magnesium
    • 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
    • C22B9/006—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with use of an inert protective material including the use of an inert gas
    • 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
    • F27B3/04—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces of multiple-hearth type; of multiple-chamber type; Combinations of hearth-type furnaces
    • F27B3/045—Multiple chambers, e.g. one of which is used for charging
    • 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
    • F27D3/14—Charging or discharging liquid or molten material

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

A three-chamber magnesium melting furnace is operated by stepwise temperature increase of the melt in the flow direction through the individual chambers (2, 3, 4). The melt temperatures are 650 deg C in the first chamber (2), 650-700 deg C in the second chamber (3) and 700 deg C in the third chamber (4). Only the first chamber (2) is supplied with gas, preferably CO2, the second and third chambers (3, 4) being sealed gas-tightly and the third chamber (4) being tapped by a reduced pressure riser pipe (11).

Description

Die Erfindung bezieht sich auf ein Verfahren zum Betreiben eines Magnesi­ umschmelzofens, wobei das zu schmelzende Material in einer ersten Kam­ mer geschmolzen und danach einer zweiten Kammer zugeführt wird, um letztlich in eine dritte Kammer zu gelangen, von wo aus die Entnahme der Schmelze erfolgt.The invention relates to a method for operating a magnesi remelting furnace, the material to be melted in a first chamber mer melted and then fed to a second chamber to ultimately to get into a third chamber, from where the removal of the Melt occurs.

Ein entsprechend aufgebauter Magnesiumschmelzofen ist durch die DE 44 39 214 A1 bekanntgeworden. Der Magnesiumschmelzofen weist mehrere Kammern auf. Einer Schmelzkammer wird das zu schmelzende Material durch einen unter die Schmelzbadoberfläche eintauchenden Chargier­ schacht zugeführt. Durch einen im unteren Drittel einer Trennwand befindli­ chen Durchlaß tritt die Schmelze langsam in eine weitere Kammer über, um danach durch einen im unteren Drittel einer zweiten Trennwand befindlichen zweiten Durchlaß in eine Dosierkammer zu gelangen. Dieser kann die Schmelze mittels einer Dosierpumpe über ein Überführungsrohr entnommen werden.A correspondingly constructed magnesium melting furnace is through the DE 44 39 214 A1 has become known. The magnesium melting furnace has several Chambers on. The material to be melted becomes a melting chamber through a charge immersed under the surface of the weld pool shaft fed. Through one located in the lower third of a partition Chen passage, the melt slowly passes into another chamber to then through one in the lower third of a second partition second passage to enter a metering chamber. This can The melt is removed via a transfer tube by means of a metering pump become.

Zur Vermeidung von Oxidationsreaktionen wird ein einen SF6(Schwefelhexafluorid)-Anteil enthaltendes Schutzgas verwendet. Eine Trennung der Räume über den Kammern ermöglicht unterschiedliche SF6- Anteile über den Schmelzen in den Kammern. Bei einem Ausführungsbei­ spiel ist im Raum über der Schmelze der ersten Kammer ein Schutzgas mit einem höheren SF6-Anteil als in dem Raum über der Schmelze in der zwei­ ten Kammer vorhanden. Der SF6-Anteil wird nur dort relativ hoch gewählt (0,5%), wo eine solch hohe Konzentration erforderlich ist. Über der zweiten Kammer und ggf. weiteren Kammern beträgt der SF6-Anteil nur 0,2 bis 0,3 %. Dies verringert die Korrosionswirkungen der sich aus SF6 bildenden Schwefelsäure in diesen Kammern, was zu einer höheren Lebensdauer des Schmelzofens führt. To avoid oxidation reactions, an inert gas containing SF 6 (sulfur hexafluoride) is used. A separation of the rooms above the chambers enables different SF 6 proportions above the melts in the chambers. In one embodiment, a protective gas with a higher SF 6 content is present in the space above the melt in the first chamber than in the space above the melt in the second chamber. The SF 6 proportion is chosen to be relatively high (0.5%) only where such a high concentration is required. The SF 6 content above the second chamber and possibly other chambers is only 0.2 to 0.3%. This reduces the corrosion effects of the sulfuric acid formed from SF 6 in these chambers, which leads to a longer service life of the melting furnace.

Eine weitgehende Reduzierung der Verwendung von SF6 ist auch aus ande­ ren Gründen geboten. Die hohe Affinität des Magnesiums zu Sauerstoff er­ fordert einen speziellen Oxidationsschutz beim Schmelzen und Gießen von Magnesiumlegierungen. Die entsprechenden Maßnahmen zielen darauf ab, zwischen den Sauerstoff der Ofenatmosphäre und die Badoberfläche eine Art Isolationsschicht zu bringen, die eine mögliche Reaktion unterbindet. Die Ausbildung einer sehr dünnen, aber hochwirksamen, passiven Oberflächen­ schutzschicht auf der Schmelze ergibt sich bei Anwendung der Schutzgase SF6 (Schwefelhexafluorid) oder SO2 (Schwefeldioxid). Die Schutzgase, die über dem Schmelzbad die Gießtemperatur von rund 700°C annehmen, ver­ lieren an relativer Dichte und zeigen Zerfallserscheinungen, wodurch letzt­ lich die Reaktionsträgheit abgebaut wird. Gelangt SF6 in die Atmosphäre, so hat es eine ausgesprochen schädliche Wirkung. Gegenüber einem weiteren für den Einsatz beim Magnesiumschmelzofen denkbaren Schutzgas, näm­ lich CO2, hat SF6 eine ca. 24 000fache Wirkung bezüglich seines vermute­ ten Erderwärmungspotentials.A large reduction in the use of SF 6 is also necessary for other reasons. The high affinity of magnesium for oxygen requires special protection against oxidation when melting and casting magnesium alloys. The corresponding measures aim to place a kind of insulation layer between the oxygen in the furnace atmosphere and the bath surface, which prevents a possible reaction. The formation of a very thin, but highly effective, passive protective surface layer on the melt results from the use of protective gases SF 6 (sulfur hexafluoride) or SO 2 (sulfur dioxide). The protective gases, which assume the casting temperature of around 700 ° C above the melt pool, lose their relative density and show signs of decay, which ultimately reduces the inertia. If SF 6 gets into the atmosphere, it has an extremely harmful effect. Compared to another protective gas conceivable for use in the magnesium melting furnace, namely CO 2 , SF 6 has an approx. 24,000-fold effect with regard to its suspected global warming potential.

Von daher ist es die Aufgabe der Erfindung ein Verfahren zum Betreiben eines Magnesiumschmelzofens aufzuzeigen, welches es erlaubt, auf den Einsatz von SF6 gänzlich zu verzichten.It is therefore the object of the invention to provide a method for operating a magnesium melting furnace which makes it possible to dispense entirely with the use of SF 6 .

Erfindungsgemäß gelingt dies durch eine Verfahrensweise, wie sie im Pa­ tentanspruch 1 angegeben ist. Die Unteransprüche stellen vorteilhafte Aus­ gestaltungen und Weiterbildungen der erfindungsgemäßen Verfahrensweise dar.According to the invention, this is achieved by a procedure as described in Pa claim 1 is specified. The dependent claims represent advantageous designs and developments of the procedure according to the invention represents.

Aus der schematischen Darstellung eines Magnesiumschmelzofens 1 in der Figur geht hervor, daß dieser aus insgesamt drei Kammern aufgebaut ist, nämlich einer Chargier- bzw. Schmelzkammer 2, einer Zwischenkammer 3 und letztlich einer Dosierkammer 4. Ähnlich dem eingangs beschriebenen Magnesiumschmelzofen gemäß der DE 44 39 214 A1 erfolgt über eine obenseitige Öffnung 5 in der Schmelzkammer 2 die Zufuhr des Magnesi­ umausgangsmaterials, das z. B. relativ reines Magnesium-Rohmaterial in Form von Masseln sein kann. Über eine im unteren Abschnitt offene, eine Durchtrittsöffnung 7 aufweisende Trennwand 6 gelangt die über geeignete Heizungen (nicht gezeigt) auf ca. 650°C erhitzte Schmelze in die Zwischen­ kammer 3. Dort wird in einer zweiten Erhitzungsstufe über geeignete weitere Heizungen die Schmelze auf einen Temperaturbereich von 650 bis 700°C erhitzt. Zwischen der Zwischenkammer 3 und einer nachgeschalteten Do­ sierkammer 4 ist wiederum eine im unteren Bereich für den Schmelzen­ durchtritt offene Trennwand 8 vorgesehen, wobei ein schräg gestellter Wandabschnitt 9 nur einen von unten nach oben gerichteten Schmelzenfluß 10 zuläßt.The schematic representation of a magnesium melting furnace 1 in the figure shows that it is made up of a total of three chambers, namely a charging or melting chamber 2 , an intermediate chamber 3 and ultimately a metering chamber 4 . Similar to the magnesium melting furnace described at the outset according to DE 44 39 214 A1, an opening 5 in the melting chamber 2 is used to supply the magnesium starting material, which, for. B. can be relatively pure magnesium raw material in the form of ingots. Via a partition 6 which is open in the lower section and has a passage opening 7 , the melt, heated to approx. 650 ° C. via suitable heaters (not shown), enters the intermediate chamber 3 . There, in a second heating stage, the melt is heated to a temperature range of 650 to 700 ° C using suitable additional heaters. Between the intermediate chamber 3 and a downstream Do sierkammer 4 is in turn a passage in the lower area for the melt open partition 8 is provided, with an inclined wall section 9 only allows a melt flow 10 directed from the bottom up.

In der dritten Kammer, der Dosierkammer 4, wird die Schmelze durch ent­ sprechend dieser Kammer zugeordnete weitere Heizungen auf die Endtemperatur von ca. 700°C erhitzt, so daß sie über ein angeschlossenes Steigrohr 11 einer Gießmaschine zugeführt werden kann. Am Steigrohr 11 liegt Unterdruck an, da die Gießmaschine vorzugsweise nach dem von der Firma Maschinenfabrik Müller-Weingarten AG, D-Weingarten, entwickelten Vakuum-Druckgießverfahren (Vacural®) arbeitet.In the third chamber, the metering chamber 4 , the melt is heated to the final temperature of approx. 700 ° C. by means of additional heaters assigned to this chamber, so that it can be fed to a casting machine via a connected riser pipe 11 . Vacuum is present on the riser pipe 11 , since the casting machine preferably works according to the vacuum pressure casting process (Vacural®) developed by Maschinenfabrik Müller-Weingarten AG, D-Weingarten.

Während die Zwischen- und die Dosierkammer 3, 4, abgesehen von zuge­ ordneten Be- und Entlüftungsventilen 12, 13, eine geschlossene Abdeckung 14 aufweisen, ist die Schmelzkammer 2, wie bereits erwähnt, mit einer obenseitigen Öffnung 5 ausgestattet. Die relativ geringe Schmelzentempera­ tur und die damit verbundene erhöhte Reaktionsträgheit des Magnesiums in der Schmelzkammer 2 erlauben es, wie Arbeiten bei der Anmelderin gezeigt haben, anstatt mit SF6 vorzugsweise nur mit reinem CO2 zu begasen.While the intermediate and the metering chamber 3 , 4 , apart from assigned ventilation and venting valves 12 , 13 , have a closed cover 14 , the melting chamber 2 , as already mentioned, is equipped with an opening 5 on the top. The relatively low melt temperature and the associated increased inertness of the magnesium in the melting chamber 2 allow, as work by the applicant has shown, instead of gassing with SF 6, preferably only with pure CO 2 .

Da die Zwischen- und die Dosierkammer 3, 4 gasdicht verschlossen sind, kann kein Sauerstoff eindringen, der ansonsten zur Oxidation des Magnesi­ ums führen würde. Die Be- und Entlüftungsventile 12, 13 dienen der Be- und Entlüftung für den Fall, daß der Flüssigkeitsspiegel verändert werden soll. Dies wird notwendig, wenn z. B. der Magnesiumschmelzofen 1 neu befüllt wird, aber auch für den Fall, daß eine der Kammern 3, 4 undicht wird und langsam Gas eindringen sollte. Über die Ventile 12, 13 kann dann wieder entlüftet werden (der Pegel der Schmelze steigt an).Since the intermediate and the metering chambers 3 , 4 are sealed gas-tight, no oxygen can penetrate, which would otherwise lead to the oxidation of the magnesi. The ventilation valves 12 , 13 are used for ventilation in the event that the liquid level is to be changed. This becomes necessary if e.g. B. the magnesium melting furnace 1 is refilled, but also in the event that one of the chambers 3 , 4 leaks and gas should slowly penetrate. The valves 12 , 13 can then be used for venting again (the level of the melt rises).

Claims (5)

1. Verfahren zum Betreiben eines Magnesiumschmelzofens, wobei das zu schmelzende Material in einer ersten Kammer geschmolzen und danach einer zweiten Kammer zugeführt wird, um letztlich in eine dritte Kammer zu gelangen, von wo aus die Entnahme der Schmelze erfolgt, dadurch gekennzeichnet, daß das zu schmelzende Material in Fließrichtung in den einzelnen Kammern (2, 3, 4) stufenweise auf höhere Temperaturen gebracht wird.1. A method of operating a magnesium melting furnace, wherein the material to be melted is melted in a first chamber and then fed to a second chamber, ultimately to get into a third chamber from where the melt is removed, characterized in that the melting material in the flow direction in the individual chambers ( 2 , 3 , 4 ) is gradually brought to higher temperatures. 2. Verfahren nach Anspruch 1, gekennzeichnet durch eine Schmelzentem­ peratur in der ersten Kammer (2) von ca. 650°C, in der zweiten Kammer (3) von ca. 650 bis 700°C und in der dritten Kammer (4) von ca. 700°C.2. The method according to claim 1, characterized by a melt temperature in the first chamber ( 2 ) of approximately 650 ° C, in the second chamber ( 3 ) of approximately 650 to 700 ° C and in the third chamber ( 4 ) of approx. 700 ° C. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß ausschließlich die erste Kammer (2) begast wird, vorzugsweise mit CO2.3. The method according to claim 1, characterized in that only the first chamber ( 2 ) is gassed, preferably with CO 2 . 4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die zweite und dritte Kammer (3, 4) gasdicht verschlossen und ausschließlich über Be- und Entlüftungsventile (12, 13) beaufschlagbar sind.4. The method according to claim 1, characterized in that the second and third chambers ( 3 , 4 ) are sealed gas-tight and can only be acted upon via ventilation and venting valves ( 12 , 13 ). 5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Schmelze aus der dritten Kammer (4) über ein unter Unterdruck stehendes Steigrohr (11) entnommen wird.5. The method according to claim 1, characterized in that the melt from the third chamber ( 4 ) via a negative pressure riser ( 11 ) is removed.
DE1997147002 1997-10-24 1997-10-24 Process for operating a magnesium melting furnace Expired - Fee Related DE19747002C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1997147002 DE19747002C2 (en) 1997-10-24 1997-10-24 Process for operating a magnesium melting furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1997147002 DE19747002C2 (en) 1997-10-24 1997-10-24 Process for operating a magnesium melting furnace

Publications (2)

Publication Number Publication Date
DE19747002A1 true DE19747002A1 (en) 1999-04-29
DE19747002C2 DE19747002C2 (en) 2000-09-21

Family

ID=7846492

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1997147002 Expired - Fee Related DE19747002C2 (en) 1997-10-24 1997-10-24 Process for operating a magnesium melting furnace

Country Status (1)

Country Link
DE (1) DE19747002C2 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001083836A2 (en) * 2000-05-04 2001-11-08 3M Innovative Properties Company Protection of molten magnesium with a cover gas using fluorocarbons
WO2002012575A2 (en) * 2000-08-03 2002-02-14 Linde Ag Method for protecting the surface of a magnesium melt by means of carbon dioxide
EP1260781A1 (en) * 2001-05-23 2002-11-27 ING. RAUCH FERTIGUNGSTECHNIK GESELLSCHAFT m.b.H. Furnace suitable for the manufacture of magnesium
US6685764B2 (en) 2000-05-04 2004-02-03 3M Innovative Properties Company Processing molten reactive metals and alloys using fluorocarbons as cover gas
US6780220B2 (en) 2000-05-04 2004-08-24 3M Innovative Properties Company Method for generating pollution credits while processing reactive metals
EP1533390A1 (en) * 2003-11-19 2005-05-25 Ing. Rauch Fertigungstechnik GmbH Process for adding alloy additions to an Al- or Mg-melt and device for carrying out said process
DE102005012721A1 (en) * 2005-03-19 2006-09-21 Volkswagen Ag Charging unit for melting pigs, especially Mg pigs, with melt tank, opening for introduction of pigs and pig conveyor, useful for melting metal pigs, especially Mg pigs, prior to further treatment, etc
EP1997572A3 (en) * 2007-05-24 2009-11-04 Meltec Industrieofenbau GmbH Melting pot with overflow for a casting machine
EP2866962B1 (en) * 2012-06-29 2017-01-18 Le Bronze Industriel Crucible for a machine for continuously casting a bar or a coil of a metal alloy

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0361926A2 (en) * 1988-09-30 1990-04-04 Kabushiki Kaisha Daiki Aluminium Kogyosho Melting and holding furnace
EP0407664A1 (en) * 1988-06-15 1991-01-16 Kabushiki Kaisha Daiki Aluminium Kogyosho Melting and holding furnace
EP0400214B1 (en) * 1989-05-29 1994-06-15 Meichu Seiki Kabushiki Kaisha Metal melting and holding furnace
EP0609196A1 (en) * 1993-01-26 1994-08-03 ING. RAUCH FERTIGUNGSTECHNIK GESELLSCHAFT m.b.H. Double chamber furnace for the charging of casting machines with molten metal
DE4439214A1 (en) * 1994-11-03 1996-05-09 Schmitz & Apelt Loi Industrieo Magnesium melting furnace and method for melting magnesium

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0407664A1 (en) * 1988-06-15 1991-01-16 Kabushiki Kaisha Daiki Aluminium Kogyosho Melting and holding furnace
EP0361926A2 (en) * 1988-09-30 1990-04-04 Kabushiki Kaisha Daiki Aluminium Kogyosho Melting and holding furnace
EP0400214B1 (en) * 1989-05-29 1994-06-15 Meichu Seiki Kabushiki Kaisha Metal melting and holding furnace
EP0609196A1 (en) * 1993-01-26 1994-08-03 ING. RAUCH FERTIGUNGSTECHNIK GESELLSCHAFT m.b.H. Double chamber furnace for the charging of casting machines with molten metal
DE4439214A1 (en) * 1994-11-03 1996-05-09 Schmitz & Apelt Loi Industrieo Magnesium melting furnace and method for melting magnesium

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6685764B2 (en) 2000-05-04 2004-02-03 3M Innovative Properties Company Processing molten reactive metals and alloys using fluorocarbons as cover gas
WO2001083836A3 (en) * 2000-05-04 2002-02-07 3M Innovative Properties Co Protection of molten magnesium with a cover gas using fluorocarbons
KR100727502B1 (en) * 2000-05-04 2007-06-14 쓰리엠 이노베이티브 프로퍼티즈 캄파니 Molten Magnesium Cover Gas Using Fluorocarbons
WO2001083836A2 (en) * 2000-05-04 2001-11-08 3M Innovative Properties Company Protection of molten magnesium with a cover gas using fluorocarbons
US6780220B2 (en) 2000-05-04 2004-08-24 3M Innovative Properties Company Method for generating pollution credits while processing reactive metals
US6537346B2 (en) 2000-05-04 2003-03-25 3M Innovative Properties Company Molten magnesium cover gas using fluorocarbons
WO2002012575A3 (en) * 2000-08-03 2002-08-01 Linde Ag Method for protecting the surface of a magnesium melt by means of carbon dioxide
WO2002012575A2 (en) * 2000-08-03 2002-02-14 Linde Ag Method for protecting the surface of a magnesium melt by means of carbon dioxide
EP1260781A1 (en) * 2001-05-23 2002-11-27 ING. RAUCH FERTIGUNGSTECHNIK GESELLSCHAFT m.b.H. Furnace suitable for the manufacture of magnesium
EP1533390A1 (en) * 2003-11-19 2005-05-25 Ing. Rauch Fertigungstechnik GmbH Process for adding alloy additions to an Al- or Mg-melt and device for carrying out said process
DE102005012721A1 (en) * 2005-03-19 2006-09-21 Volkswagen Ag Charging unit for melting pigs, especially Mg pigs, with melt tank, opening for introduction of pigs and pig conveyor, useful for melting metal pigs, especially Mg pigs, prior to further treatment, etc
DE102005012721B4 (en) 2005-03-19 2019-01-17 Volkswagen Ag Charging system and method for melting metal ingots
EP1997572A3 (en) * 2007-05-24 2009-11-04 Meltec Industrieofenbau GmbH Melting pot with overflow for a casting machine
EP2866962B1 (en) * 2012-06-29 2017-01-18 Le Bronze Industriel Crucible for a machine for continuously casting a bar or a coil of a metal alloy

Also Published As

Publication number Publication date
DE19747002C2 (en) 2000-09-21

Similar Documents

Publication Publication Date Title
DE69807812T3 (en) Vacuum degassing apparatus for molten glass
DE1291760B (en) Process and device for discontinuous and continuous vacuum melting and casting of steel and steel-like alloys (super alloys)
DE19747002C2 (en) Process for operating a magnesium melting furnace
DE3938656A1 (en) METHOD AND DEVICE FOR THE PRODUCTION OF OXYGEN-FREE COPPER
EP0172785B1 (en) Metallurgical vessel
DE4207059C1 (en) Process for the purification of oxidic melts
AT405529B (en) METHOD AND DEVICE FOR THE DOUBLE VACUUM PRODUCTION OF STEEL
EP0012449B1 (en) Use of a device for separating and enrichment of a hydrogen isotope from a mixture of hydrogen isotopes
DE1262319C2 (en) Process for treating molten metal
DE69917551T2 (en) The vacuum degassing
DE112018002481B4 (en) A breathable plug used to ventilate and stir a furnace bottom and a metal furnace
DE3504723A1 (en) Process for purifying silicon
DE1100975B (en) Electrolysis cell for the extraction of metals of high purity by fused-salt electrolysis
DE661792C (en) Process for refining copper
DE3050264T1 (en) Process for making tools from tool steel powders
DE10208903B4 (en) Furnace for remelting a titanium block
DE1032553B (en) Process for degassing liquid melts and device for carrying out the process
EP3049543B1 (en) Production of high-grade manganese from ferromanganese by means of vaporization in a vacuum induction plant
DE1916817B2 (en) Stirrer for molten glass and process for its manufacture
DE1433075A1 (en) Vacuum melting and casting process and device for carrying out the same
AT202172B (en) Process and device for the vacuum treatment of steel
DE2227521C3 (en) Process for electroslag remelting of titanium or its alloys and apparatus for carrying out this process
DE2553455C2 (en) Device for reducing the oxidation of a metal of a metal dross
DE1045987B (en) Process for reducing the permeability and vulnerability of the walls of a vessel made of refractory material containing an aggressive liquid, preferably for the production of aluminum by fused-salt electrolysis and a device for carrying out this process
AT82166B (en) Device for the electrolytic production of bleaching solutions u. like

Legal Events

Date Code Title Description
OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
OP8 Request for examination as to paragraph 44 patent law
D2 Grant after examination
8364 No opposition during term of opposition
8320 Willingness to grant licenses declared (paragraph 23)
R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee

Effective date: 20120501