EP1044285B1 - Verfahren zum betrieb von ofenanlagen für magnesiumlegierungen - Google Patents
Verfahren zum betrieb von ofenanlagen für magnesiumlegierungen 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
- Authority
- EP
- European Patent Office
- Prior art keywords
- nitrogen
- gas
- air
- conditioned room
- magnesium alloys
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- 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.
Landscapes
- 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
Claims (6)
- Verfahren zum Betrieb von Ofenanlagen für Magnesiumlegierungen, bei dem eine Badoberfläche mit einem Schutzgas aus einem Gemisch von SO2 und einem Inertgas abgedeckt wird, wobei der Volumsanteil von SO2 genau auf einen Wert eingestellt wird, der in einem Bereich zwischen 0,3 % und 1,5 %, vorzugsweise zwischen 0,5 % und 1,0 % liegt, dadurch gekennzeichnet, daß die Mischung von SO2 und dem Inertgas in einem klimatisiertern Raum erfolgt.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß als Inertgas Stickstoff verwendet wird.
- Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Temperatur des klimatisierten Raums oberhalb von 22°C und vorzugsweise in einem Bereich zwischen 25°C und 35°C gehalten wird.
- Vorrichtung zur Erzeugung eines Schutzgases für Ofenanlagen für Magnesiumlegierungen mit einem Vorratsbehälter (2) für eine Schwefelverbindung, einem Vorratsbehälter (9) für ein Inertgas und einer Mischeinrichtung (21) zur genauen Durchflußregelung von SO2 und Stickstoff, dadurch gekennzeichnet, daß die Mischeinrichtung (21) in einem klimatisierten Raum angeordnet ist.
- Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der klimatisierte Raum auf einer Temperatur von mehr als 22°C, vorzugsweise auf einer Temperatur zwischen 25°C und 35°C gehalten wird.
- Vorrichtung nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, daß Spülleitungen (10, 13, 41) und -ventile zum Spülen der normalerweise SO2-führenden Anlagenteile vorgesehen sind.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0072997U AT2420U1 (de) | 1997-11-24 | 1997-11-24 | Verfahren zum betrieb von ofenanlagen für magnesiumlegierungen |
AT72997U | 1997-11-24 | ||
PCT/AT1998/000279 WO1999027144A1 (de) | 1997-11-24 | 1998-11-12 | Verfahren zum betrieb von ofenanlagen für magnesiumlegierungen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1044285A1 EP1044285A1 (de) | 2000-10-18 |
EP1044285B1 true EP1044285B1 (de) | 2001-08-29 |
Family
ID=3498276
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98955253A Expired - Lifetime EP1044285B1 (de) | 1997-11-24 | 1998-11-12 | Verfahren zum betrieb von ofenanlagen für magnesiumlegierungen |
Country Status (10)
Country | Link |
---|---|
US (1) | US6527826B1 (de) |
EP (1) | EP1044285B1 (de) |
JP (1) | JP2001524599A (de) |
AT (2) | AT2420U1 (de) |
AU (1) | AU744178B2 (de) |
BR (1) | BR9814891A (de) |
CA (1) | CA2311361A1 (de) |
DE (1) | DE59801357D1 (de) |
ES (1) | ES2162479T3 (de) |
WO (1) | WO1999027144A1 (de) |
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 |
US20090007728A1 (en) * | 2005-03-02 | 2009-01-08 | Japan Metals And Chemicals Co., Ltd | Method For Melting an Alloy Containing a Metal of a High Vapor Pressure |
JP2006258347A (ja) * | 2005-03-16 | 2006-09-28 | Taiyo Nippon Sanso Corp | マグネシウム溶解装置及びマグネシウム溶解装置へのカバーガス供給方法 |
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 (de) | 1969-05-05 | 1971-02-25 | Fruehling J | Schutzatmospharen fur Magnesium und M agne sium legierungen |
AT389477B (de) * | 1981-03-10 | 1989-12-11 | Linde Ag | Anwendung eines verfahrens zum schuetzen der badoberflaeche einer metallschmelze |
US5087485A (en) * | 1990-08-14 | 1992-02-11 | Texas Instruments Incorporated | Isopropanol catalyst for copper chemical vapor deposition |
DE4203193C2 (de) | 1992-02-05 | 1999-09-30 | Inst Werkstoffkunde Uni Hannov | Verfahren und Vorrichtung zur Handhabung von Magnesium- und Magnesium-Legierungsschmelzen |
DE4439214A1 (de) | 1994-11-03 | 1996-05-09 | Schmitz & Apelt Loi Industrieo | Magnesiumschmelzofen und Verfahren zum Schmelzen von Magnesium |
-
1997
- 1997-11-24 AT AT0072997U patent/AT2420U1/de not_active IP Right Cessation
-
1998
- 1998-11-12 WO PCT/AT1998/000279 patent/WO1999027144A1/de active IP Right Grant
- 1998-11-12 DE DE59801357T patent/DE59801357D1/de not_active Expired - Fee Related
- 1998-11-12 CA CA002311361A patent/CA2311361A1/en not_active Abandoned
- 1998-11-12 JP JP2000522285A patent/JP2001524599A/ja active Pending
- 1998-11-12 AT AT98955253T patent/ATE204919T1/de not_active IP Right Cessation
- 1998-11-12 US US09/555,058 patent/US6527826B1/en not_active Expired - Fee Related
- 1998-11-12 ES ES98955253T patent/ES2162479T3/es not_active Expired - Lifetime
- 1998-11-12 AU AU12183/99A patent/AU744178B2/en not_active Ceased
- 1998-11-12 EP EP98955253A patent/EP1044285B1/de not_active Expired - Lifetime
- 1998-11-12 BR BR9814891-5A patent/BR9814891A/pt not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
AT2420U1 (de) | 1998-10-27 |
EP1044285A1 (de) | 2000-10-18 |
DE59801357D1 (de) | 2001-10-04 |
AU744178B2 (en) | 2002-02-14 |
AU1218399A (en) | 1999-06-15 |
ATE204919T1 (de) | 2001-09-15 |
WO1999027144A1 (de) | 1999-06-03 |
US6527826B1 (en) | 2003-03-04 |
CA2311361A1 (en) | 1999-06-03 |
BR9814891A (pt) | 2000-10-03 |
JP2001524599A (ja) | 2001-12-04 |
ES2162479T3 (es) | 2001-12-16 |
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