EP1044285B1 - Operation method of furnace equipment for magnesium alloys - Google Patents
Operation method of furnace equipment for magnesium alloys Download PDFInfo
- Publication number
- EP1044285B1 EP1044285B1 EP98955253A EP98955253A EP1044285B1 EP 1044285 B1 EP1044285 B1 EP 1044285B1 EP 98955253 A EP98955253 A EP 98955253A EP 98955253 A EP98955253 A EP 98955253A EP 1044285 B1 EP1044285 B1 EP 1044285B1
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- EP
- European Patent Office
- Prior art keywords
- nitrogen
- gas
- air
- conditioned room
- magnesium alloys
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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
- C22B9/006—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
-
- 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
-
- 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
- F27B3/22—Arrangements of air or gas supply devices
-
- 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
- F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
Definitions
- the present invention relates to a method for operating furnace systems for Magnesium alloys, according to the preamble of claim 1.
- SF 6 is used as such a protective gas, which reacts with the magnesium of the melt and forms a protective layer which protects the melt from the ingress of atmospheric oxygen. Mixtures of SF 6 and nitrogen are sometimes used for this purpose. Since SF 6 is a greenhouse gas, its use is questionable for environmental reasons. In addition, the cost of this gas is relatively high.
- SO 2 has already been considered as the protective gas.
- SO 2 is relatively inexpensive and, like SF 6, forms a protective layer on a magnesium melt. So far, however, the use of SO 2 has been prevented by the fact that it is an extremely unpleasant smelling gas that is harmful to health and corrosive in medium to high concentrations.
- SO 2 is used in a conventional manner, gas cannot escape from the furnaces or the like, which leads to an impermissible pollution of the environment. In particular, the MAK values are exceeded by far.
- the object of the present invention is to provide a method which, on the one hand A safe treatment of magnesium melts enables, however on the other hand causes as little environmental pollution as possible.
- Nitrogen is particularly preferably used as the inert gas. Nitrogen is available at low cost and is not environmentally critical. In a particularly advantageous embodiment variant of the method according to the invention it is provided that the mixing of SO 2 and the inert gas takes place in an air-conditioned room, the temperature of which is kept above 22 ° C. and preferably in a range between 25 ° C. and 35 ° C. It has been found that a satisfactory mixture of SO 2 and nitrogen is only possible from a certain minimum temperature at a pressure> 2 bar. In addition, temperature-related volume and pressure fluctuations of the gases involved can be reliably avoided by mixing in an air-conditioned room. A temperature of about 30 ° C. is particularly preferred.
- the present invention relates to a device for generating a protective gas for furnace systems for magnesium alloys with a storage container for a sulfur compound, a storage container for an inert gas and a mixing device.
- the device according to the invention is characterized in that the mixing device is designed for precise flow control of SO 2 and nitrogen and is arranged in an air-conditioned room. In an air-conditioned room there are safety gas cells that hold SO 2 bottles. Nitrogen is taken from a normal tank. The mixing of SO 2 and nitrogen takes place via electronic mass flow meters, which are arranged in the air-conditioned room. The gas mixture produced in this way is transported to the corresponding furnace systems via pipelines and adapted to consumption via local control systems. These can be melting furnaces, holding furnaces, dosing furnaces and ingot casting belts for magnesium alloys.
- SO 2 sensors are installed in the safety gas cells, which already respond to low SO 2 concentrations. After an SO 2 bottle has been emptied, it is flushed with the corresponding pipelines with nitrogen in order to rule out a health hazard when changing the bottle. In this way, SO 2 can be reliably prevented from getting into the environment.
- the broken lines 1 describe the components which are arranged in two safety cabinets.
- Gas bottles 2 serve as a storage container for sulfur dioxide, which is supplied to a manifold 4 via shut-off valves 3.
- a control line 5a which controls a solenoid valve 6, is supplied via a manometer 5.
- a supply line 8 for SO 2 is connected via a further shut-off valve 7.
- a storage container 9 for nitrogen is connected via a line 10, a shut-off valve 11 and a check valve 12 to the distributor line 4 in each of the two safety cabinets 1 in order to provide nitrogen for flushing the lines when the bottles 2 are changed.
- a manometer 13 indicates the nitrogen pressure in a main nitrogen line 16.
- the individual bottles 2 are connected to an exhaust manifold 19 via shut-off valves 17 and exhaust pipes 18.
- the distribution line 4 is vented into the exhaust manifold 19 via its own shut-off valves 20.
- the mixing device for supplying the represented individual consumers. Since the individual mixer 21 basically are constructed in the same way, only one is identified by reference numerals and in the description explained.
- the individual mixers 21 are supplied with nitrogen via a first distributor bar 22 and supplied with sulfur dioxide via a second distributor bar 23.
- a third Manifold 24 serves to connect the mixer 21 to the exhaust manifold 19.
- Shut-off valves 25 and 26 are provided in the individual mixers 21, which are connected to the distributor strip 22 or 23.
- Manometer 27 or 28 show the nitrogen or sulfur dioxide pressure after the shut-off valves 25 or 26.
- There is a between the nitrogen line and the sulfur dioxide line Shut-off valve 29 is provided for flushing, which is followed by a check valve 30 is.
- Highly accurate flow meters 31 for nitrogen and 32 for Sulfur dioxide are used to set an exact quantitative ratio of two gases.
- the flow meters 31 and 32 are filters 33 and 34 upstream.
- shut-off valves 35 and 36 and a check valve 37 in the nitrogen line the gases are brought together in a supply line 38, which are provided with a manometer 39 and a shut-off valve 40 is.
- a rinsing line 41 with a shut-off valve 42 serves to avoid this of environmental pollution during maintenance work or the like
- the entire arrangement, which is shown in the figure, is according to the invention in an air-conditioned room arranged at a temperature of about 30 ° C is held. In this way, the mixing ratio of the gases on a exactly predetermined value are kept and a good mixing guaranteed become.
- Quantity controllers (not shown) can be provided for the individual consumers be, but only the supplied amount of the gas mixture, but not affect the composition of the gas.
- the present invention thus not only enables cost savings but also also a significant reduction in environmental pollution and a particular one safe operation when handling magnesium melts.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Furnace Details (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Description
Die vorliegende Erfindung betrifft ein Verfahren zum Betrieb von Ofenanlagen für Magnesiumlegierungen, gemäß dem Oberbegriff von Patentanspruch 1.The present invention relates to a method for operating furnace systems for Magnesium alloys, according to the preamble of claim 1.
Bei Anlagen, in denen flüssiges Magnesium vorliegt, müssen besondere Vorkehrungen getroffen werden, um den Hinzutritt von Luftsauerstoff zuverlässig zu verhindern, da Magnesium in flüssigem Zustand extrem brennbar ist. Als ein solches Schutzgas wird beispielsweise SF6 verwendet, das mit dem Magnesium der Schmelze reagiert und eine Schutzschicht ausbildet, die die Schmelze vor dem Hinzutritt von Luftsauerstoff schützt. Fallweise werden für diesen Zweck auch Gemische aus SF6 und Stickstoff eingesetzt. Da es sich bei SF6 um ein Treibhausgas handelt, ist die Verwendung aus Umweltschutzgründen bedenklich. Außerdem sind die Kosten für dieses Gas relativ hoch.In plants in which liquid magnesium is present, special precautions must be taken to reliably prevent the entry of atmospheric oxygen, since magnesium is extremely flammable in the liquid state. SF 6 , for example, is used as such a protective gas, which reacts with the magnesium of the melt and forms a protective layer which protects the melt from the ingress of atmospheric oxygen. Mixtures of SF 6 and nitrogen are sometimes used for this purpose. Since SF 6 is a greenhouse gas, its use is questionable for environmental reasons. In addition, the cost of this gas is relatively high.
Alternativ dazu ist bereits überlegt worden, als Schutzgas SO2 einzusetzen. SO2 ist relativ kostengünstig verfügbar und bildet ebenso wie SF6 eine Schutzschicht auf einer Magnesiumschmelze. Der Einsatz von SO2 wurde jedoch bisher dadurch verhindert, dass es sich dabei um ein extrem unangenehm riechendes Gas handelt, das in mittleren bis höheren Konzentrationen gesundheitsschädlich und korrosionsfördernd ist. Beim Einsatz von SO2 in herkömmlicher Weise ist ein Austritt von Gas aus den Öfen oder dergleichen nicht zu vermeiden, der zu einer unzulässigen Belastung der Umgebung führt. Insbesonders werden dabei die MAK-Werte bei weitem überschritten.Alternatively, SO 2 has already been considered as the protective gas. SO 2 is relatively inexpensive and, like SF 6, forms a protective layer on a magnesium melt. So far, however, the use of SO 2 has been prevented by the fact that it is an extremely unpleasant smelling gas that is harmful to health and corrosive in medium to high concentrations. When SO 2 is used in a conventional manner, gas cannot escape from the furnaces or the like, which leads to an impermissible pollution of the environment. In particular, the MAK values are exceeded by far.
Weiters ist es bekannt, Gasgemische aus SO2 und getrockneter Luft als Schutzgas für Magnesiumöfen einzusetzen. Dabei ist es jedoch nicht gelungen, einerseits die toxische und korrosive Wirkung von SO2 zu kontrollieren und andererseits einen sicheren Ofenbetrieb zu realisieren.Furthermore, it is known to use gas mixtures of SO 2 and dried air as a protective gas for magnesium furnaces. However, it was not possible to control the toxic and corrosive effects of SO 2 on the one hand and to implement safe furnace operation on the other.
Die DE 20 18 407 A und die Paper "Interaction of Magnesium with Gases" von Aleksandrova, Yu. P. und Roshchina, I.N., Met. Sci. Heat Treat., Bd. 19, Nr. 3 bis 4, März 1977 bis April 1977, Seiten 218 bis 221, XP002096025, sowie "Practical Aspects of Using Sulphur Hexafluoride in Fluxless Melting of Magnesium and is Alloys" von Heffron, J. F. und SAHA D., North American Die Casting Associaticn, Conference 17th International Die Casting Congress and Exposition, Bd. 94, Nr. 2, 18. bis 21. Oktober 1993, Seiten 322 bis 329, XP002096023 Cleveland, Ohio (US) zeigen Verfahren und Vorrichtungen zum Mischen von SO2 mit Inertgasen. Da ein genaues Mischungsverhältnis nicht gewährleistet werden kann, ist das Ergebnis derartiger Verfahren unbefried gend. DE 20 18 407 A and the paper "Interaction of Magnesium with Gases" by Aleksandrova, Yu. P. and Roshchina, IN, Met. Sci. Heat Treat., Vol. 19, No. 3 to 4, March 1977 to April 1977, pages 218 to 221, XP002096025, and "Practical Aspects of Using Sulfur Hexafluoride in Fluxless Melting of Magnesium and is Alloys" by Heffron, JF and SAHA D., North American Die Casting Associaticn, Conference 17th International Die Casting Congress and Exposition, Vol. 94, No. 2, October 18-21, 1993, pages 322 to 329, XP002096023 Cleveland, Ohio (US) show methods and apparatus for mixing SO 2 with inert gases. Since an exact mixing ratio cannot be guaranteed, the result of such processes is unsatisfactory.
Aufgabe der vorliegenden Erfindung ist es, ein Verfahren zu schaffen, das einerseits eine sichere Behandlung von Magnesiumschmelzen ermöglicht, das jedoch andererseits eine möglichst geringe Umweltbelastung hervorruft.The object of the present invention is to provide a method which, on the one hand A safe treatment of magnesium melts enables, however on the other hand causes as little environmental pollution as possible.
Erfindungsgemäß wird diese Aufgabe durch die Merkmale des Patentanspruchs 1 gelöst. In überraschender Weise hat sich herausgestellt, dass es im Fall von SO2 einen kleinen Bereich gibt, in dem einerseits eine ausreichende Schutzwirkung vorhanden ist, jedoch andererseits eine Umweltbelastung weitgehend vermieden werden kann. Wesentlich an der vorliegenden Erfindung ist die Einstellung eines genauen Wertes der SO2-Konzentration im Schutzgas. Da mit sehr geringen SO2-Konzentrationen gearbeitet wird, ist eine exakte Prozessführung und das Vermeiden von Schwankungen in der Gaszusammensetzung sehr wichtig, um Brände zu vermeiden.According to the invention, this object is achieved by the features of patent claim 1. Surprisingly, it has been found that in the case of SO 2 there is a small area in which there is a sufficient protective effect on the one hand, but on the other hand environmental pollution can be largely avoided. What is essential to the present invention is the setting of an exact value of the SO 2 concentration in the protective gas. Since very low SO 2 concentrations are used, exact process control and the avoidance of fluctuations in the gas composition are very important in order to avoid fires.
Besonders bevorzugt wird als Inertgas Stickstoff eingesetzt. Stickstoff ist kostengünstig verfügbar und nicht umweltkritisch. In einer besonders begünstigten Ausführungsvariante des erfindungsgemäßen Verfahrens ist vorgesehen, dass die Mischung von SO2 und dem Inertgas in einem klimatisiertem Raum erfolgt, dessen Temperatur oberhalb von 22°C und vorzugsweise in einem Bereich zwischen 25°C und 35°C gehalten wird. Es hat sich herausgestellt, dass bei einem Leistungsdruck > 2 bar eine zufriedenstellende Mischung von SO2 und Stickstoff nur ab einer gewissen Mindesttemperatur möglich ist. Außerdem können durch die Mischung in einem klimatisierten Raum temperaturbedingte Volums- und Druckschwankungen der beteiligten Gase sicher vermieden werden. Besonders bevorzugt ist eine Temperatur von etwa 30°C.Nitrogen is particularly preferably used as the inert gas. Nitrogen is available at low cost and is not environmentally critical. In a particularly advantageous embodiment variant of the method according to the invention it is provided that the mixing of SO 2 and the inert gas takes place in an air-conditioned room, the temperature of which is kept above 22 ° C. and preferably in a range between 25 ° C. and 35 ° C. It has been found that a satisfactory mixture of SO 2 and nitrogen is only possible from a certain minimum temperature at a pressure> 2 bar. In addition, temperature-related volume and pressure fluctuations of the gases involved can be reliably avoided by mixing in an air-conditioned room. A temperature of about 30 ° C. is particularly preferred.
Weiters betrifft die vorliegende Erfindung eine Vorrichtung zur Erzeugung eines Schutzgases für Ofenanlagen für Magnesiumlegierungen mit einem Vorratsbehälter für eine Schwefelverbindung, einem Vorratsbehälter für ein Inertgas und einer Mischeinrichtung. Die erfindungsgemäße Vorrichtung ist dadurch gekennzeichnet, dass die Mischeinrichtung zur genauen Durchflussregelung von SO2 und Stickstoff ausgebildet ist, und in einem klimatisierten Raum angeordnet ist. In einem klimatisierten Raum sind Sicherheitsgaszellen angebracht, die SO2-Flaschen aufnehmen. Stickstoff wird aus einem üblichen Tank entnommen. Die Mischung von SO2 und Stickstoff erfolgt über elektronische Massendurchflussmesser, die in dem klimatisierten Raum angeordnet sind. Das so hergestellte Gasgemisch wird zu den entsprechenden Ofenanlagen über Rohrleitungen transportiert und über örtliche Regelsysteme dem Verbrauch angepasst. Dabei kann es sich um Schmelzöfen, Warmhalteöfen, Dosieröfen und Masselgießbander für Magnesiumlegierungen handeln.Furthermore, the present invention relates to a device for generating a protective gas for furnace systems for magnesium alloys with a storage container for a sulfur compound, a storage container for an inert gas and a mixing device. The device according to the invention is characterized in that the mixing device is designed for precise flow control of SO 2 and nitrogen and is arranged in an air-conditioned room. In an air-conditioned room there are safety gas cells that hold SO 2 bottles. Nitrogen is taken from a normal tank. The mixing of SO 2 and nitrogen takes place via electronic mass flow meters, which are arranged in the air-conditioned room. The gas mixture produced in this way is transported to the corresponding furnace systems via pipelines and adapted to consumption via local control systems. These can be melting furnaces, holding furnaces, dosing furnaces and ingot casting belts for magnesium alloys.
In den Sicherneitsgaszellen sind SO2-Sensoren angebracht, die bereits auf geringe SO2-Konzentrationen ansprechen. Nachdem eine SO2-Flasche geleert wor-den ist, wird diese samt den entsprechenden Rohrleitungen mit Stickstoff gespült, um eine Gesundheitsgefahr beim Flaschenwechsel auszuschließen. Auf diese Weise kann zuverlässig verhindert werden, dass SO2 in die Umgebung gelangt.SO 2 sensors are installed in the safety gas cells, which already respond to low SO 2 concentrations. After an SO 2 bottle has been emptied, it is flushed with the corresponding pipelines with nitrogen in order to rule out a health hazard when changing the bottle. In this way, SO 2 can be reliably prevented from getting into the environment.
Durch die geringe SO2-Konzentration des Schutzgases kann eine Umweltbelastung und insbesonders eine Geruchsbelästigung auch im Ofenbereich sicher vermieden werden, wobei durch das genau eingestellte Mischungsverhältnis ein sicherer Betrieb gewährleistet werden kann.Due to the low SO 2 concentration of the protective gas, environmental pollution and in particular an unpleasant smell can also be reliably avoided in the furnace area, and safe operation can be ensured by the precisely set mixing ratio.
In der Fig. ist das grundsätzliche Schaltungsdiagramm einer erfindungsgemäßen Vorrichtung dargestellt.In the figure is the basic circuit diagram of an inventive one Device shown.
Mit den unterbrochenen Linien 1 sind die Bauteile umschrieben, die in zwei Sicherheitsschränken
angeordnet sind. Gasflaschen 2 dienen als Vorratsbehälter
für Schwefeldioxyd, das über Absperrventile 3 einer Sammelleitung 4 zugeführt
wird. Über ein Manometer 5 wird eine Steuerleitung 5a versorgt, die ein Magnetventil
6 ansteuert. Über ein weiteres Absperrventil 7 ist eine Versorgungsleitung
8 für SO2 angeschlossen.The broken lines 1 describe the components which are arranged in two safety cabinets.
Ein Vorratsbehälter 9 für Stickstoff ist über je eine Leitung 10, ein Absperrventil
11 und ein Rückschlagventil 12 mit der Verteilerleitung 4 in jedem der beiden
Sicherheitsschränke 1 verbunden, um Stickstoff zur Spülung der Leitungen beim
Wechseln der Flaschen 2 zur Verfügung zu stellen. Ein Manometer 13 zeigt den
Stickstoff-Druck in einer Stickstoff-Hauptleitung 16 an. Über Absperrventile 17
und Abgasleitungen 18 stehen die einzelnen Flaschen 2 mit einer Abgassammelleitung
19 in Verbindung. Die Verteilerleitung 4 wird über eigene Absperrventile
20 in die Abgassammelleitung 19 entlüftet. Durch die oben beschriebene Schaltung
ist es möglich, vor dem Wechseln einer der Flaschen 2 die entsprechenden
Leitungsabschnitte mit Stickstoff zu spülen, so dass ein Austreten von SO2 sicher
vermieden werden kann.A
In dem rechten Abschnitt der Fig. ist die Mischeinrichtung zur Versorgung der
einzelnen Verbraucher dargestellt. Da die einzelnen Mischer 21 grundsätzlich
gleich aufgebaut sind, ist nur einer mit Bezugszeichen bezeichnet und in der Beschreibung
erklärt.In the right section of the figure is the mixing device for supplying the
represented individual consumers. Since the
Die einzelnen Mischer 21 werden über eine erste Verteilerleiste 22 mit Stickstoff
und über eine zweite Verteilerleiste 23 mit Schwefeldioxyd versorgt. Eine dritte
Verteilerleiste 24 dient zur Verbindung der Mischer 21 mit der Abgassammelleitung
19. In den einzelnen Mischern 21 sind Absperrventile 25 bzw. 26 vorgesehen,
die mit der Verteilerleiste 22 bzw. 23 verbunden sind. Manometer 27 bzw.
28 zeigen den Stickstoff- bzw. Schwefeldioxyddruck nach den Absperrventilen 25
bzw. 26 an. Zwischen der Stickstoffleitung und der Schwefeldioxydleitung ist ein
Absperrventil 29 zur Spülung vorgesehen, dem ein Rückschlagventil 30 nachgeschaltet
ist. Hochgenaue Mengendurchflussmesser 31 für Stickstoff und 32 für
Schwefeldioxyd dienen zur Einstellung eines genauen Mengenverhältnisses der
beiden Gase. Den Mengendurchflussmessern 31 und 32 sind Filter 33 und 34
vorgeschaltet. Über weitere Absperrventile 35 und 36 und ein Rückschlagventil
37 in der Stickstoffleitung werden die Gase in eine Versorgungsleitung 38 zusammengeführt,
die mit einem Manometer 39 und einem Absperrventil 40 versehen
ist. Eine Spülleitung 41 mit einem Absperrventil 42 dient zur Vermeidung
von Umweltbelastungen bei Wartungsarbeiten oder dgl.The
Die gesamte Anordnung, die in der Fig. dargestellt ist, ist erfindungsgemäß in einem klimatisierten Raum angeordnet, der auf einer Temperatur von etwa 30°C gehalten wird. Auf diese Weise kann das Mischungsverhältnis der Gase auf einem genau vorbestimmten Wert gehalten werden und eine gute Durchmischung gewährleistet werden.The entire arrangement, which is shown in the figure, is according to the invention in an air-conditioned room arranged at a temperature of about 30 ° C is held. In this way, the mixing ratio of the gases on a exactly predetermined value are kept and a good mixing guaranteed become.
Bei den einzelnen Verbrauchern können nicht dargestellte Mengenregler vorgesehen sein, die jedoch nur die zugeführte Menge des Gasgemisches, nicht aber die Zusammensetzung des Gases beeinflussen.Quantity controllers (not shown) can be provided for the individual consumers be, but only the supplied amount of the gas mixture, but not affect the composition of the gas.
Die vorliegende Erfindung ermöglicht somit nicht nur eine Kostenersparnis, sondern auch eine wesentliche Verringerung der Umweltbelastung und einen besonders sicheren Betrieb beim Umgang mit Magnesiumschmelzen.The present invention thus not only enables cost savings but also also a significant reduction in environmental pollution and a particular one safe operation when handling magnesium melts.
Claims (6)
- A method for operating furnace equipment for magnesium alloys, in which a bath surface is covered with a protective furnace gas of a mixture of SO2 and an inert gas, with the volume share of SO2 being set precisely to a value which is in a range of between 0.3% and 1.5%, preferably between 0.5% and 1.0%, characterized in that the mixture of SO2 and the inert gas is performed in an air-conditioned room.
- A method as claimed in claim 1, characterized in that nitrogen is used as an inert gas.
- A method as claimed in one of the claims 1 or 2, characterized in that the temperature of the air-conditioned room is held above 22°C and preferably in a range of between 25°C and 35°C.
- An apparatus to produce a protective furnace gas for furnace equipment for magnesium alloys with a storage vessel (2) for a sulphur compound, a storage vessel (9) for an inert gas and a mixing device (21) for the precise flow control of SO2 and nitrogen, characterized in that the mixing device (21) is arranged in an air-conditioned room.
- An apparatus as claimed in claim 4, characterized in that the air-conditioned room is held at a temperature of more than 22°C, preferably at a temperature of between 25°C and 35°C.
- An apparatus as claimed in one of the claims 4 or 5, characterized in that scavenging lines (10, 13, 41) and flush valves are provided for scavenging the usually SO2-containing parts of the installation.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT72997U | 1997-11-24 | ||
| AT0072997U AT2420U1 (en) | 1997-11-24 | 1997-11-24 | METHOD FOR THE OPERATION OF OVEN PLANTS FOR MAGNESIUM ALLOYS |
| PCT/AT1998/000279 WO1999027144A1 (en) | 1997-11-24 | 1998-11-12 | Operation method of furnace equipment for magnesium alloys |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1044285A1 EP1044285A1 (en) | 2000-10-18 |
| EP1044285B1 true EP1044285B1 (en) | 2001-08-29 |
Family
ID=3498276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98955253A Expired - Lifetime EP1044285B1 (en) | 1997-11-24 | 1998-11-12 | Operation method of furnace equipment for magnesium alloys |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US6527826B1 (en) |
| EP (1) | EP1044285B1 (en) |
| JP (1) | JP2001524599A (en) |
| AT (2) | AT2420U1 (en) |
| AU (1) | AU744178B2 (en) |
| BR (1) | BR9814891A (en) |
| CA (1) | CA2311361A1 (en) |
| DE (1) | DE59801357D1 (en) |
| ES (1) | ES2162479T3 (en) |
| WO (1) | WO1999027144A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6783487B2 (en) | 2001-04-13 | 2004-08-31 | Kimberly-Clark Worldwide, Inc. | Pant-type personal care articles, and methods of making and using such personal care articles |
| WO2006093334A1 (en) * | 2005-03-02 | 2006-09-08 | Japan Metals And Chemicals Co., Ltd. | Method of melting alloy containing high-vapor-pressure metal |
| JP2006258347A (en) * | 2005-03-16 | 2006-09-28 | Taiyo Nippon Sanso Corp | Magnesium dissolution device and method for supplying cover gas thereto |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1898969A (en) * | 1932-03-21 | 1933-02-21 | Dow Chemical Co | Method of protecting magnesium and its alloys at elevated temperatures |
| DE2018407A1 (en) * | 1969-05-05 | 1971-02-25 | Fruehling J | Protective atmosphere for magnesium and magnesium alloys |
| AT389477B (en) * | 1981-03-10 | 1989-12-11 | Linde Ag | APPLICATION OF A METHOD FOR PROTECTING THE BATH SURFACE OF A METAL MELT |
| US5087485A (en) * | 1990-08-14 | 1992-02-11 | Texas Instruments Incorporated | Isopropanol catalyst for copper chemical vapor deposition |
| DE4203193C2 (en) * | 1992-02-05 | 1999-09-30 | Inst Werkstoffkunde Uni Hannov | Method and device for handling magnesium and magnesium alloy melts |
| DE4439214A1 (en) * | 1994-11-03 | 1996-05-09 | Schmitz & Apelt Loi Industrieo | Magnesium melting furnace and method for melting magnesium |
-
1997
- 1997-11-24 AT AT0072997U patent/AT2420U1/en not_active IP Right Cessation
-
1998
- 1998-11-12 CA CA002311361A patent/CA2311361A1/en not_active Abandoned
- 1998-11-12 DE DE59801357T patent/DE59801357D1/en not_active Expired - Fee Related
- 1998-11-12 ES ES98955253T patent/ES2162479T3/en not_active Expired - Lifetime
- 1998-11-12 US US09/555,058 patent/US6527826B1/en not_active Expired - Fee Related
- 1998-11-12 EP EP98955253A patent/EP1044285B1/en not_active Expired - Lifetime
- 1998-11-12 WO PCT/AT1998/000279 patent/WO1999027144A1/en active IP Right Grant
- 1998-11-12 AU AU12183/99A patent/AU744178B2/en not_active Ceased
- 1998-11-12 JP JP2000522285A patent/JP2001524599A/en active Pending
- 1998-11-12 BR BR9814891-5A patent/BR9814891A/en not_active IP Right Cessation
- 1998-11-12 AT AT98955253T patent/ATE204919T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001524599A (en) | 2001-12-04 |
| US6527826B1 (en) | 2003-03-04 |
| ES2162479T3 (en) | 2001-12-16 |
| ATE204919T1 (en) | 2001-09-15 |
| CA2311361A1 (en) | 1999-06-03 |
| DE59801357D1 (en) | 2001-10-04 |
| WO1999027144A1 (en) | 1999-06-03 |
| EP1044285A1 (en) | 2000-10-18 |
| BR9814891A (en) | 2000-10-03 |
| AU744178B2 (en) | 2002-02-14 |
| AT2420U1 (en) | 1998-10-27 |
| AU1218399A (en) | 1999-06-15 |
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