EP1019211A1 - Procede de fusion de magnesium, sans emissions - Google Patents
Procede de fusion de magnesium, sans emissionsInfo
- Publication number
- EP1019211A1 EP1019211A1 EP98939025A EP98939025A EP1019211A1 EP 1019211 A1 EP1019211 A1 EP 1019211A1 EP 98939025 A EP98939025 A EP 98939025A EP 98939025 A EP98939025 A EP 98939025A EP 1019211 A1 EP1019211 A1 EP 1019211A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- mixture
- flowmeter
- dry air
- 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
Links
- 239000011777 magnesium Substances 0.000 title claims abstract description 20
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 13
- 238000002844 melting Methods 0.000 title claims abstract description 12
- 230000008018 melting Effects 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims description 17
- 239000000203 mixture Substances 0.000 claims abstract description 27
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims 20
- 239000004291 sulphur dioxide Substances 0.000 claims 10
- 229910000861 Mg alloy Inorganic materials 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 claims 1
- 235000010269 sulphur dioxide Nutrition 0.000 claims 1
- 239000000956 alloy Substances 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 21
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 8
- 239000000155 melt Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 231100000616 occupational exposure limit Toxicity 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 206010037844 rash Diseases 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Furnace Details (AREA)
- Compounds Of Unknown Constitution (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Glass Compositions (AREA)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO973149A NO304893B1 (no) | 1997-07-07 | 1997-07-07 | FremgangsmÕte for smelting av magnesium uten flussmiddel og utstyr for dette |
| NO973149 | 1997-07-07 | ||
| PCT/NO1998/000200 WO1999002287A1 (fr) | 1997-07-07 | 1998-07-03 | Procede de fusion de magnesium, sans emissions |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1019211A1 true EP1019211A1 (fr) | 2000-07-19 |
| EP1019211B1 EP1019211B1 (fr) | 2002-05-02 |
Family
ID=19900908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98939025A Expired - Lifetime EP1019211B1 (fr) | 1997-07-07 | 1998-07-03 | Procede de fusion de magnesium, sans emissions |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1019211B1 (fr) |
| JP (1) | JP2001509543A (fr) |
| AT (1) | ATE216932T1 (fr) |
| AU (1) | AU8753498A (fr) |
| DE (1) | DE69805195D1 (fr) |
| NO (1) | NO304893B1 (fr) |
| WO (1) | WO1999002287A1 (fr) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US6398844B1 (en) * | 2000-02-07 | 2002-06-04 | Air Products And Chemicals, Inc. | Blanketing molten nonferrous metals and alloys with gases having reduced global warming potential |
| DE50211923D1 (de) | 2002-09-25 | 2008-04-30 | Frech Oskar Gmbh & Co | Schutzgaseinrichtung für Druckgussmaschinen |
| CN107289782B (zh) * | 2016-03-31 | 2019-05-07 | 中国科学院金属研究所 | 一种生产高洁净度镁或镁合金的多炉联合式熔铸设备和工艺 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2018407A1 (de) * | 1969-05-05 | 1971-02-25 | Fruehling J | Schutzatmospharen fur Magnesium und M agne sium legierungen |
| BG33467A1 (en) * | 1980-12-11 | 1983-03-15 | Nikolov | Method and machine for castind under presure |
| US4478270A (en) * | 1981-04-01 | 1984-10-23 | Interlake, Inc. | Apparatus for casting low-density alloys |
| DE4129879A1 (de) * | 1991-09-09 | 1993-03-11 | Loi Ind Ofenanlagen | Verfahren zum austausch der atmosphaere eines industrieofens |
| AUPN716195A0 (en) * | 1995-12-14 | 1996-01-18 | Australian Magnesium Corporation Pty Ltd | Ingot mould system |
-
1997
- 1997-07-07 NO NO973149A patent/NO304893B1/no unknown
-
1998
- 1998-07-03 EP EP98939025A patent/EP1019211B1/fr not_active Expired - Lifetime
- 1998-07-03 AU AU87534/98A patent/AU8753498A/en not_active Abandoned
- 1998-07-03 DE DE69805195T patent/DE69805195D1/de not_active Expired - Lifetime
- 1998-07-03 JP JP2000501854A patent/JP2001509543A/ja not_active Withdrawn
- 1998-07-03 AT AT98939025T patent/ATE216932T1/de not_active IP Right Cessation
- 1998-07-03 WO PCT/NO1998/000200 patent/WO1999002287A1/fr not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9902287A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1019211B1 (fr) | 2002-05-02 |
| ATE216932T1 (de) | 2002-05-15 |
| NO973149L (no) | 1999-01-08 |
| WO1999002287A8 (fr) | 1999-04-15 |
| NO973149D0 (no) | 1997-07-07 |
| WO1999002287A1 (fr) | 1999-01-21 |
| JP2001509543A (ja) | 2001-07-24 |
| DE69805195D1 (de) | 2002-06-06 |
| AU8753498A (en) | 1999-02-08 |
| NO304893B1 (no) | 1999-03-01 |
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