WO1999002287A1 - Method of fluxless melting of magnesium - Google Patents
Method of fluxless melting of magnesium Download PDFInfo
- Publication number
- WO1999002287A1 WO1999002287A1 PCT/NO1998/000200 NO9800200W WO9902287A1 WO 1999002287 A1 WO1999002287 A1 WO 1999002287A1 NO 9800200 W NO9800200 W NO 9800200W WO 9902287 A1 WO9902287 A1 WO 9902287A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gas
- mixture
- flowmeter
- dry air
- magnesium
- 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
- C22B9/006—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
- 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
-
- 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
-
- 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
- F27D2007/063—Special atmospheres, e.g. high pressure atmospheres
Definitions
- the present invention concerns a method of fluxless melting of magnesium, and more particularly a method of mixing and controlled feeding of protection gas to melting/holding furnaces and apparatus applied by such method.
- Magnesium (metal) is known for its high affinity to oxygen and high vapour pressure of molten Mg (alloys) causing operational problems.
- SO 2 atmosphere strongly reduces the oxidation of molten magnesium by modifying the surface film and that producers of primary metal, sand and die casters have been using SO 2 in gas form or generated (in situ) by adding sulphur powder to furnaces.
- SO 2 is, however, toxic. In high concentrations and in contact with humidity it results in enhanced corrosion of steel equipment.
- the present occupational exposure limit in Norway is 2 ppm over an 8 hours period of time corresponding to a concentration of 5 mg/m 3 , and corresponding limits in Germany and North America are similar.
- Another object of the present invention is to provide an apparatus ensuring environmentally safe mixing and feeding of the SO 2 air mix into the Mg-furnaces/vessels.
- Still another object of the present invention is to provide an improved method of fluxless melting of magnesium substantially reducing problems connected to formation of scaling on the crucible walls.
- Fig. 1 shows schematically a flow chart of the mixing/feeding process
- Fig. 2 illustrates schematically in a vertical, partial cross-section a feeding arrangement (apparatus) usable in the process of fluxless melting of magnesium
- Fig. 3 shows schematically the applied furnace/vessel in a horizontal cross- section along line I-I
- a melting furnace 1 is equipped with charging device 2 to feed solid magnesium into the furnace, transferring device, e.g. transfer tube 3 to move subsequently the Mg-melt into and adjacent casting unit (furnace) here depicted as 4.
- transferring device e.g. transfer tube 3 to move subsequently the Mg-melt into and adjacent casting unit (furnace) here depicted as 4.
- gas displacement (metering) pump 5 the melt is fed in a controlled manner (doses) into any suitable casting equipment, e.g. the shown high pressure die casting machine 6.
- an apparatus arrangement for controlled mixing/feeding of the mixture SO 2 /dry air comprises a compressor 13 and a pressure bottle 14 providing (dry) air and SO 2 gas, respectively, into the mixing device 9 comprising a mass flowmeters 10 and 12 for the air and SO 2 , respectively, and a control steering unit 11 to ensure an adequate pre-set concentration of SO 2 in the gas mixture.
- the resulting gas mixture is then conducted through a feeding line 8 and distributed by means of manifolds (flowmeters) 7 and customary valves into the actual (part of) furnaces 1 and 4.
- FIG. 2 shows schematically in a partial, vertical cross-section the furnace 1 as a steel vessel accommodated in a thermally insulated furnace shell 20.
- the melting furnace is provided with a charging device 2 to introduce solid Mg into the furnace, a baffle plate 15 dividing the furnace into a charging sector and a main body of the melting furnace where the furnace design/configuration should assure a high ratio volume/surface area in order to minimise reaction(s) occurring between molten Mg and the atmosphere. Consequently, all lids and hatches must also be well tightened as illustrated in an exploded view showing details of lid seals 16.
- the gas mixture is provided to the furnace(s) through a sophisticated distribution system allowing the gas mixture to be evenly distributed close to the melt surface, e.g. by means of a ring tube 17 positioned along the furnace periphery in the vicinity of the melt surface as shown in Fig. 3.
- Fig. 3 illustrating schematically the applied melting furnace 1 in a horizontal cross-section taken along line I-I in Fig. 2, further depicts the charging zone (device) 2, dividing baffle plate 15 and a lid 19 for eventual removal of dross/sludge from the furnace.
- the ring tube 17 is provided with a plurality of apertures ensuring an even distribution of the protective gas mixture by controlled directional impingement of the melt surface.
- Tests have been carried out on an industrial scale in a hot-chamber casting machine.
- a mixing unit built according to the present invention provided SO 2 /dry air mixture for the furnace. Gas samples were frequently monitored (every four hours) both from the mixing unit, the furnace atmosphere and the working atmosphere as well.
- Gas samples of the atmosphere were collected at three differenct locations in the foundry - at operator level, in the vicinity of the charging lid and approximately 3 m above the floor. No significant differences were measured in the gas concentrations between the locations indicating a safe, controlled operation and an adequate ventilation of the foundry hall.
- a controlled diluted SO 2 /air mixture was provided and maintained during the test periods, something being of crucial importance also for the life time of the applied steel equipment.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU87534/98A AU8753498A (en) | 1997-07-07 | 1998-07-03 | Method of fluxless melting of magnesium |
DE69805195T DE69805195D1 (en) | 1997-07-07 | 1998-07-03 | METHOD FOR MELAGON-FREE MELTING |
AT98939025T ATE216932T1 (en) | 1997-07-07 | 1998-07-03 | METHOD FOR THE SLACK-FREE MELTING OF MAGNESIUM |
JP2000501854A JP2001509543A (en) | 1997-07-07 | 1998-07-03 | Solvent-free melting of magnesium |
EP98939025A EP1019211B1 (en) | 1997-07-07 | 1998-07-03 | Method of fluxless melting of magnesium |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO973149A NO304893B1 (en) | 1997-07-07 | 1997-07-07 | Process for melting magnesium without flux and equipment for this |
NO973149 | 1997-07-07 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1999002287A1 true WO1999002287A1 (en) | 1999-01-21 |
WO1999002287A8 WO1999002287A8 (en) | 1999-04-15 |
Family
ID=19900908
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NO1998/000200 WO1999002287A1 (en) | 1997-07-07 | 1998-07-03 | Method of fluxless melting of magnesium |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1019211B1 (en) |
JP (1) | JP2001509543A (en) |
AT (1) | ATE216932T1 (en) |
AU (1) | AU8753498A (en) |
DE (1) | DE69805195D1 (en) |
NO (1) | NO304893B1 (en) |
WO (1) | WO1999002287A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1122322A1 (en) * | 2000-02-07 | 2001-08-08 | Air Products And Chemicals, Inc. | Blanketing molten non-ferrous metals and alloys with fluoride gases having reduced global warming potential |
US6521018B2 (en) | 2000-02-07 | 2003-02-18 | Air Products And Chemicals, Inc. | Blanketing metals and alloys at elevated temperatures with gases having reduced global warming potential |
EP1402977A1 (en) * | 2002-09-25 | 2004-03-31 | Oskar Frech Gmbh & Co. | Shielding gas device for pressure die casting machines |
CN107289782A (en) * | 2016-03-31 | 2017-10-24 | 中国科学院金属研究所 | A kind of many stove association type smelting-casting equipments and technique for producing high-cleanness, high magnesium or magnesium alloy |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2018407A1 (en) * | 1969-05-05 | 1971-02-25 | Fruehling J | Protective atmosphere for magnesium and magnesium alloys |
US4478270A (en) * | 1981-04-01 | 1984-10-23 | Interlake, Inc. | Apparatus for casting low-density alloys |
US4550763A (en) * | 1980-12-11 | 1985-11-05 | Institute Po Metaloznanie I Technologia Na Metalite | Method and machine for pressure diecasting |
EP0531810A2 (en) * | 1991-09-09 | 1993-03-17 | LOI Thermprocess GmbH | Process to change an industrial furnace athmosphere |
WO1997021510A1 (en) * | 1995-12-14 | 1997-06-19 | Commonwealth Scientific And Industrial Research Organisation | Ingot mould system |
-
1997
- 1997-07-07 NO NO973149A patent/NO304893B1/en unknown
-
1998
- 1998-07-03 JP JP2000501854A patent/JP2001509543A/en not_active Withdrawn
- 1998-07-03 EP EP98939025A patent/EP1019211B1/en not_active Expired - Lifetime
- 1998-07-03 AU AU87534/98A patent/AU8753498A/en not_active Abandoned
- 1998-07-03 DE DE69805195T patent/DE69805195D1/en not_active Expired - Lifetime
- 1998-07-03 AT AT98939025T patent/ATE216932T1/en not_active IP Right Cessation
- 1998-07-03 WO PCT/NO1998/000200 patent/WO1999002287A1/en active IP Right Grant
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2018407A1 (en) * | 1969-05-05 | 1971-02-25 | Fruehling J | Protective atmosphere for magnesium and magnesium alloys |
US4550763A (en) * | 1980-12-11 | 1985-11-05 | Institute Po Metaloznanie I Technologia Na Metalite | Method and machine for pressure diecasting |
US4478270A (en) * | 1981-04-01 | 1984-10-23 | Interlake, Inc. | Apparatus for casting low-density alloys |
EP0531810A2 (en) * | 1991-09-09 | 1993-03-17 | LOI Thermprocess GmbH | Process to change an industrial furnace athmosphere |
WO1997021510A1 (en) * | 1995-12-14 | 1997-06-19 | Commonwealth Scientific And Industrial Research Organisation | Ingot mould system |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1122322A1 (en) * | 2000-02-07 | 2001-08-08 | Air Products And Chemicals, Inc. | Blanketing molten non-ferrous metals and alloys with fluoride gases having reduced global warming potential |
US6521018B2 (en) | 2000-02-07 | 2003-02-18 | Air Products And Chemicals, Inc. | Blanketing metals and alloys at elevated temperatures with gases having reduced global warming potential |
EP1402977A1 (en) * | 2002-09-25 | 2004-03-31 | Oskar Frech Gmbh & Co. | Shielding gas device for pressure die casting machines |
WO2004030849A1 (en) * | 2002-09-25 | 2004-04-15 | Oskar Frech Gmbh + Co. Kg | Protective gas device for pressure die-casting machines |
US7290588B2 (en) | 2002-09-25 | 2007-11-06 | Oskar Frech Gmbh & Co. Kg | Protective gas device for pressure die-casting machines |
CN107289782A (en) * | 2016-03-31 | 2017-10-24 | 中国科学院金属研究所 | A kind of many stove association type smelting-casting equipments and technique for producing high-cleanness, high magnesium or magnesium alloy |
CN107289782B (en) * | 2016-03-31 | 2019-05-07 | 中国科学院金属研究所 | A kind of more furnace association type smelting-casting equipments and technique producing high-cleanness, high magnesium or magnesium alloy |
Also Published As
Publication number | Publication date |
---|---|
EP1019211A1 (en) | 2000-07-19 |
JP2001509543A (en) | 2001-07-24 |
EP1019211B1 (en) | 2002-05-02 |
DE69805195D1 (en) | 2002-06-06 |
NO973149D0 (en) | 1997-07-07 |
ATE216932T1 (en) | 2002-05-15 |
WO1999002287A8 (en) | 1999-04-15 |
NO973149L (en) | 1999-01-08 |
NO304893B1 (en) | 1999-03-01 |
AU8753498A (en) | 1999-02-08 |
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