WO2002012575A2 - Verfahren zum schützen der oberfläche einer magnesiumschmelze mittels kohlendioxid - Google Patents
Verfahren zum schützen der oberfläche einer magnesiumschmelze mittels kohlendioxid Download PDFInfo
- Publication number
- WO2002012575A2 WO2002012575A2 PCT/EP2001/008983 EP0108983W WO0212575A2 WO 2002012575 A2 WO2002012575 A2 WO 2002012575A2 EP 0108983 W EP0108983 W EP 0108983W WO 0212575 A2 WO0212575 A2 WO 0212575A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- carbon dioxide
- melt
- magnesium
- protecting
- snow
- Prior art date
Links
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
- C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
- C22B9/103—Methods of introduction of solid or liquid refining or fluxing agents
-
- 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
Definitions
- the invention relates to a method for protecting the surface of a magnesium melt or a melt of an alloy with magnesium, in which a protective layer is applied to the surface of the melt.
- the inert gas covers have the disadvantage that the evaporation of magnesium is not prevented.
- Salt covers have the disadvantage that salt particles contaminate the melt.
- SF6 has the disadvantage that it damages the ozone layer while SO2 is toxic in itself.
- carbon dioxide snow which, as is known, can be produced directly from carbon dioxide stores — gas bottles or cryogenic stores — using appropriate nozzles.
- Carbon dioxide snow is available in practically any quantity at any time and can therefore be added easily - with appropriate specifications - controlled or regulated - depending on the measurement of critical parameters.
- the shape properties of snow also contribute to the good functioning of the "snow process".
- comparable results can also be achieved with carbon dioxide pellets, which are basically compressed carbon dioxide snow.
- the carbon dioxide pellets or granules or tablets for carrying out the process must be stored independently and fed or charged to the melt surface via suitable conveying devices.
- an overpressure relative to the environment can be maintained in a closed furnace device, for example by means of a pressure control valve, which very effectively prevents the entry of oxygen from the air into the furnace device. In this way - in closed systems - almost any potential fire hazard is prevented.
- the procedure according to the invention is also effective and advantageous in the case of open systems such as crucibles, pans or channels.
- the oxygen content of the atmosphere which is formed above the melt in a closed system is determined and the amount of solid carbon dioxide supplied per unit of time of the melt surface is adjusted on the basis of the measured oxygen content in such a way that the oxygen content of the protective gas atmosphere is always below 3% by volume, preferably below 2% by volume, remains.
- the effective separating action of the cover according to the invention permits higher residual oxygen contents than is the case with known methods. Therefore, there is an economical process from an economic point of view.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Carbon And Carbon Compounds (AREA)
- Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001293716A AU2001293716A1 (en) | 2000-08-03 | 2001-08-02 | Method for protecting the surface of a magnesium melt by means of carbon dioxide |
EP01974102A EP1315842A2 (de) | 2000-08-03 | 2001-08-02 | Verfahren zum schützen der oberfläche einer magnesiumschmelze mittels kohlendioxid |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2000138543 DE10038543A1 (de) | 2000-08-03 | 2000-08-03 | Verfahren zum Schützen der Oberfläche einer Magnesiumschmelze |
DE10038543.5 | 2000-08-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002012575A2 true WO2002012575A2 (de) | 2002-02-14 |
WO2002012575A3 WO2002012575A3 (de) | 2002-08-01 |
Family
ID=7651633
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/008983 WO2002012575A2 (de) | 2000-08-03 | 2001-08-02 | Verfahren zum schützen der oberfläche einer magnesiumschmelze mittels kohlendioxid |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1315842A2 (de) |
AU (1) | AU2001293716A1 (de) |
DE (1) | DE10038543A1 (de) |
WO (1) | WO2002012575A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1881082A1 (de) * | 2006-07-20 | 2008-01-23 | Linde Aktiengesellschaft | Verfahren zum Kühlen von Magnesiumguss |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012107865A1 (de) * | 2012-08-27 | 2014-05-15 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Verfahren zum Gießen von Bauteilen |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2008731A (en) * | 1934-07-24 | 1935-07-23 | Aluminum Co Of America | Treatment of easily oxidizable alloys |
US4089678A (en) * | 1975-08-01 | 1978-05-16 | Hanawalt Joseph D | Method and product for protecting molten magnesium |
DE3109066A1 (de) * | 1981-03-10 | 1982-09-30 | Linde Ag, 6200 Wiesbaden | "verfahren zum schuetzen der badoberflaeche einer magnesiumschmelze" |
US4666511A (en) * | 1985-04-01 | 1987-05-19 | L'air Liquide | Process for producing killed steel having a low nitrogen content |
DE19747002A1 (de) * | 1997-10-24 | 1999-04-29 | Audi Ag | Verfahren zum Betreiben eines Magnesiumschmelzofens |
-
2000
- 2000-08-03 DE DE2000138543 patent/DE10038543A1/de not_active Withdrawn
-
2001
- 2001-08-02 EP EP01974102A patent/EP1315842A2/de not_active Ceased
- 2001-08-02 WO PCT/EP2001/008983 patent/WO2002012575A2/de not_active Application Discontinuation
- 2001-08-02 AU AU2001293716A patent/AU2001293716A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2008731A (en) * | 1934-07-24 | 1935-07-23 | Aluminum Co Of America | Treatment of easily oxidizable alloys |
US4089678A (en) * | 1975-08-01 | 1978-05-16 | Hanawalt Joseph D | Method and product for protecting molten magnesium |
DE3109066A1 (de) * | 1981-03-10 | 1982-09-30 | Linde Ag, 6200 Wiesbaden | "verfahren zum schuetzen der badoberflaeche einer magnesiumschmelze" |
US4666511A (en) * | 1985-04-01 | 1987-05-19 | L'air Liquide | Process for producing killed steel having a low nitrogen content |
DE19747002A1 (de) * | 1997-10-24 | 1999-04-29 | Audi Ag | Verfahren zum Betreiben eines Magnesiumschmelzofens |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1881082A1 (de) * | 2006-07-20 | 2008-01-23 | Linde Aktiengesellschaft | Verfahren zum Kühlen von Magnesiumguss |
Also Published As
Publication number | Publication date |
---|---|
DE10038543A1 (de) | 2002-02-14 |
WO2002012575A3 (de) | 2002-08-01 |
EP1315842A2 (de) | 2003-06-04 |
AU2001293716A1 (en) | 2002-02-18 |
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