EP1881082A1 - Procédé pour refroidir des coulages en magnésium - Google Patents
Procédé pour refroidir des coulages en magnésium Download PDFInfo
- Publication number
- EP1881082A1 EP1881082A1 EP06017643A EP06017643A EP1881082A1 EP 1881082 A1 EP1881082 A1 EP 1881082A1 EP 06017643 A EP06017643 A EP 06017643A EP 06017643 A EP06017643 A EP 06017643A EP 1881082 A1 EP1881082 A1 EP 1881082A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- carbon dioxide
- magnesium
- snow
- liquid
- cooling
- 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.)
- Withdrawn
Links
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 48
- 239000011777 magnesium Substances 0.000 title claims abstract description 48
- 238000001816 cooling Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims description 19
- 238000005266 casting Methods 0.000 title abstract description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 114
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 55
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 55
- 239000007788 liquid Substances 0.000 claims abstract description 35
- 241000282887 Suidae Species 0.000 claims abstract description 7
- 239000000155 melt Substances 0.000 claims description 13
- 238000000859 sublimation Methods 0.000 claims description 4
- 230000008022 sublimation Effects 0.000 claims description 4
- 230000002040 relaxant effect Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 5
- 229910000861 Mg alloy Inorganic materials 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 241000533950 Leucojum Species 0.000 description 1
- MVWDJLOUEUAWIE-UHFFFAOYSA-N O=C=O.O=C=O Chemical compound O=C=O.O=C=O MVWDJLOUEUAWIE-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- -1 magnesium melts Chemical class 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D3/00—Pig or like casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/002—Castings of light metals
- B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D30/00—Cooling castings, not restricted to casting processes covered by a single main group
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
- F25D3/12—Devices using other cold materials; Devices using cold-storage bodies using solidified gases, e.g. carbon-dioxide snow
- F25D3/127—Stationary devices with conveyors carrying articles to be cooled through the cooling space
Definitions
- the invention relates to a method for cooling ingots or molds filled with liquid magnesium melt.
- molten magnesium is poured into dies or ingots and then cooled to cure.
- Molten magnesium occupies a special position among molten metals because of its enormously high affinity for oxygen.
- a mixture of SF 6 is usually applied with air to the bath surface of the liquid magnesium. Due to the greenhouse effect, instead of SF 6 SO 2 is increasingly being used or inert gas covers made of N 2 / SO 2 mixtures or Ar / SO 2 mixtures are used.
- the masses charged with liquid magnesium are then cooled in a cooling tunnel.
- the cooling is done so far mostly in air or in an inert gas atmosphere of N 2 / SO 2 , Ar / SO 2 or argon.
- This object is achieved by a method for cooling filled with liquid magnesium melt ingots or molds, which characterized in that on the surface of the melt carbon dioxide snow is applied.
- magnesium in the following not only pure magnesium, but also magnesium alloys understood, unless explicitly stated otherwise.
- the subsequent step of cooling the molds or ingots filled with liquid magnesium advantageously takes place in a carbon dioxide atmosphere. Oxidations of the still liquid at this stage magnesium are thus effectively avoided.
- the invention thus provides a method for simultaneously cooling and inertizing ingots filled with liquid magnesium or magnesium alloys.
- carbon dioxide snow is added to the ingot or mold after pouring the liquid magnesium or liquid magnesium alloy into the ingot or mold.
- liquid CO 2 is passed under high pressure through an outlet nozzle and relaxed, with a mixture of solid and gaseous CO 2 is formed. Due to its high cooling capacity of 573 kJ / kg, the CO 2 snow impinging on the melt reduces the surface temperature of the magnesium melt from 680 to 720 ° C established in the casting operation to values between approx. 550 and 600 ° C , This leads to a significantly reduced evaporation tendency of magnesium. In addition, by sublimation of CO 2 snow gas expansion, whereby oxygen is largely displaced from the surface of the melt surface.
- the mold or ingot with the magnesium is preferably transported through a cooling tunnel and cooled until the magnesium has solidified.
- the carbon dioxide snow is advantageously generated immediately before the cooling tunnel.
- the protective carbon dioxide snow layer Prior to entry of the molten magnesium filled ingot into the cooling tunnel, the protective carbon dioxide snow layer is blasted onto the magnesium surface.
- the carbon dioxide snow is generated by relaxing liquid carbon dioxide. This produces not only the desired snow but also gaseous carbon dioxide.
- this carbon dioxide gas is passed into the cooling tunnel and serves there on the one hand for inerting and the other for the cooling of magnesium.
- the still molten magnesium will first evaporate a portion of the carbon dioxide snow, which passes through sublimation in the gaseous state of matter. It is advantageous if this sublimation carbon dioxide is also passed into the cooling tunnel. This can be done for example by suitably arranged fans or fans. Depending on the design of the cooling tunnel, a pressure difference prevailing between the cooling tunnel and the environment may be sufficient to draw the carbon dioxide gas into the cooling tunnel.
- the pressure of the liquid carbon dioxide is increased to at least 15 bar, more preferably at least 25 bar, most preferably at least 35 bar.
- the proportion of snow in proportion to the gas content is also increased.
- the liquid CO 2 is expanded via a plurality of nozzles or via a pipe having a multiplicity of outlet openings.
- the cross-sectional area of the outlet openings or the nozzle openings is preferably less than 1 mm 2 , more preferably between 0.6 and 0.8 mm 2 .
- the nozzle (s) are surrounded with a hood or cover or placed in an expansion chamber which is open towards the mass to be cooled.
- the resulting in the expansion of snow is thereby directed in the direction of the pig and also promoted by the partial enclosure or cover of the nozzle agglomeration of the carbon dioxide snow to larger particles.
- baffles on which the carbon dioxide snow produced during the expansion of the liquid CO 2 impinges and agglomerates into larger snowflakes. If a hood, cover or expansion chamber described above is present, the baffles are advantageously provided therein.
- the nozzles or outlets for the liquid carbon dioxide should not be too close to the hot magnesium surface, otherwise the depressurization of the liquid CO 2 will not achieve the required low temperatures to produce CO 2 snow or the snow portion in the carbon dioxide snow -GasGemisch is low.
- the nozzles should not be too far away from the pig, so that they can still be snowed specifically.
- the nozzles are therefore spaced at least 10 cm, preferably 20 to 30 cm from the mass.
- Liquid magnesium or a liquid magnesium alloy 1 is supplied via a line 4 and poured into the ingots or molds 2, which are arranged on a conveyor belt (ingot casting) 3.
- the magnesium-filled ingots are conveyed further by means of the conveyor belt 3 and covered with carbon dioxide snow 5.
- liquid carbon dioxide is supplied via line 6 one or more expansion nozzles 7 and relaxed, with a mixture of carbon dioxide snow 5 and gaseous carbon dioxide 8 is formed.
- a baffle 11 is preferably provided, for example, a pipe or sheet metal element, on which a part of the Carbon dioxide snow hits.
- the snow agglomerates into larger snow particles, which are then entrained by the gas flow again.
- the expansion nozzle (s) 7 and the baffles 11 surrounded by a hood or cover 12, which has at its lower end a directed to the pig to be pigged outlet opening.
- cooling tunnel 9 is on the one hand rendered inert, that is, air is displaced from the cooling tunnel 9, on the other hand, the cold carbon dioxide gas is used to cool the hot magnesium.
- the magnesium After passing through the cooling tunnel 9, the magnesium is solidified and can be taken out of the pigs 2 at the discharge point 10.
- FIG. 2 shows a variant of the method according to the invention.
- the same components are provided in both figures with the same reference numerals.
- the system shown in FIG. 2 differs from that according to FIG. 1 in that the cooling tunnel 9 is dispensed with. Instead, successively three snowmaking devices 13a, 13b, 13c are provided. Each of the snow-making devices 13a, 13b, 13c is preferably identical to the snow-making device shown in FIG. 1 with expansion nozzle 7, baffle 11 and hood 12.
- the filled with liquid magnesium pig 2 is cyclically conveyed on the conveyor belt 3. Immediately after the introduction of the liquid magnesium, the ingot 2 is snowed for 10 seconds with the snow-making device 13a. Subsequently, the pig 2 is transported to the snow-making device 13b and again snowed there for 10 seconds. The same happens in the snowmaking device 13c. In this way, the magnesium is gradually cooled, with the carbon dioxide cover displacing oxygen from the melt surface at the same time.
- the pig 2 is thus snowed in succession with the aid of the three snowmaking devices 13a, 13b, 13c, the pig 2 being transported further by means of the conveyor belt 3 after each individual snowmaking process.
- the single snow-making operation on one of the snow-making devices 13a, 13b, 13c can be kept relatively short, so that the cycle time in the quasi-continuous process of conveying the pigs 2 on the conveyor belt 3 by covering the pigs 2 with carbon dioxide snow is not or at most is negligibly affected. Due to the multiple snowmaking nevertheless required for cooling of the magnesium and an inertization of the melt surface carbon dioxide amount is applied to the pig 2.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Manufacture And Refinement Of Metals (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200610033698 DE102006033698A1 (de) | 2006-07-20 | 2006-07-20 | Verfahren zum Gießen von Magnesium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1881082A1 true EP1881082A1 (fr) | 2008-01-23 |
Family
ID=37400927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP06017643A Withdrawn EP1881082A1 (fr) | 2006-07-20 | 2006-08-24 | Procédé pour refroidir des coulages en magnésium |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1881082A1 (fr) |
| DE (1) | DE102006033698A1 (fr) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110508761A (zh) * | 2019-08-15 | 2019-11-29 | 六安钢铁控股集团特钢有限公司 | 一种180吨铁包快速铸铁块工艺 |
| US20240247858A1 (en) * | 2021-06-01 | 2024-07-25 | Messer Se & Co. Kgaa | Method and apparatus for producing frozen products |
Citations (9)
| 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 |
| US3815377A (en) * | 1970-02-26 | 1974-06-11 | L Tyree | System for cooling material using co{11 {11 snow |
| DE3100028A1 (de) * | 1981-01-02 | 1982-04-22 | VEB Kombinat Gießereianlagenbau und Gußerzeugnisse - GISAG -, DDR 7031 Leipzig | Kuehltunnel fuer die gesteuerte zwangskuehlung von erhitztem gut, insbesondere von gussstuecken |
| JPS61182869A (ja) * | 1985-02-09 | 1986-08-15 | Kubota Ltd | マンガン−アルミニウム系合金鋳造方法 |
| US4666511A (en) * | 1985-04-01 | 1987-05-19 | L'air Liquide | Process for producing killed steel having a low nitrogen content |
| EP0639650A1 (fr) * | 1993-08-18 | 1995-02-22 | The Commonwealth Industrial Gases Limited | Dispositif pour décharger de l'anhydride carbonique sous forme de neige |
| EP0986966A2 (fr) * | 1998-08-10 | 2000-03-22 | Praxair Technology, Inc. | Refroidisseur à impact de fluide |
| WO2002012575A2 (fr) * | 2000-08-03 | 2002-02-14 | Linde Ag | Procede de protection de la surface d'une masse fondue de magnesium |
| WO2005005897A2 (fr) * | 2003-07-11 | 2005-01-20 | Packo Inox Nv | Dispositif permettant de pulveriser de la neige carbonique dans une chambre de congelation ou de refrigeration et utilisation d'une soupape de non-retour en tant que tuyere d'expansion pour un dispositif de ce type |
-
2006
- 2006-07-20 DE DE200610033698 patent/DE102006033698A1/de not_active Withdrawn
- 2006-08-24 EP EP06017643A patent/EP1881082A1/fr not_active Withdrawn
Patent Citations (9)
| 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 |
| US3815377A (en) * | 1970-02-26 | 1974-06-11 | L Tyree | System for cooling material using co{11 {11 snow |
| DE3100028A1 (de) * | 1981-01-02 | 1982-04-22 | VEB Kombinat Gießereianlagenbau und Gußerzeugnisse - GISAG -, DDR 7031 Leipzig | Kuehltunnel fuer die gesteuerte zwangskuehlung von erhitztem gut, insbesondere von gussstuecken |
| JPS61182869A (ja) * | 1985-02-09 | 1986-08-15 | Kubota Ltd | マンガン−アルミニウム系合金鋳造方法 |
| US4666511A (en) * | 1985-04-01 | 1987-05-19 | L'air Liquide | Process for producing killed steel having a low nitrogen content |
| EP0639650A1 (fr) * | 1993-08-18 | 1995-02-22 | The Commonwealth Industrial Gases Limited | Dispositif pour décharger de l'anhydride carbonique sous forme de neige |
| EP0986966A2 (fr) * | 1998-08-10 | 2000-03-22 | Praxair Technology, Inc. | Refroidisseur à impact de fluide |
| WO2002012575A2 (fr) * | 2000-08-03 | 2002-02-14 | Linde Ag | Procede de protection de la surface d'une masse fondue de magnesium |
| WO2005005897A2 (fr) * | 2003-07-11 | 2005-01-20 | Packo Inox Nv | Dispositif permettant de pulveriser de la neige carbonique dans une chambre de congelation ou de refrigeration et utilisation d'une soupape de non-retour en tant que tuyere d'expansion pour un dispositif de ce type |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110508761A (zh) * | 2019-08-15 | 2019-11-29 | 六安钢铁控股集团特钢有限公司 | 一种180吨铁包快速铸铁块工艺 |
| US20240247858A1 (en) * | 2021-06-01 | 2024-07-25 | Messer Se & Co. Kgaa | Method and apparatus for producing frozen products |
| US12298073B2 (en) * | 2021-06-01 | 2025-05-13 | Messer Se & Co. Kgaa | Method and apparatus for producing frozen products |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102006033698A1 (de) | 2008-01-24 |
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| 18D | Application deemed to be withdrawn |
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