EP0248994A1 - Process for degassing and refining light-metal melts - Google Patents
Process for degassing and refining light-metal melts Download PDFInfo
- Publication number
- EP0248994A1 EP0248994A1 EP87104952A EP87104952A EP0248994A1 EP 0248994 A1 EP0248994 A1 EP 0248994A1 EP 87104952 A EP87104952 A EP 87104952A EP 87104952 A EP87104952 A EP 87104952A EP 0248994 A1 EP0248994 A1 EP 0248994A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- treatment
- melt
- molding
- aluminum chloride
- degassing
- 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- Withdrawn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
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
- C22B21/00—Obtaining aluminium
- C22B21/06—Obtaining aluminium refining
- C22B21/064—Obtaining aluminium refining using inert or reactive gases
Definitions
- the invention relates to a method for degassing and refining melts made of aluminum or magnesium and their alloys
- Chlorine gas requires relatively complex installations, is extremely corrosive and is a dangerous substance.
- Hexachloroethane as the most well-known chlorine-releasing substance has a much lower efficiency than chlorine and also forms decomposition products, e.g. Hexachlorobenzene, octochlorostyrene and similar highly chlorinated compounds that are extremely harmful to the environment.
- Heavy metal chlorides are largely free from the aforementioned disadvantages, but are more or less undesirably hygroscopic as well as toxic and also contaminate the melts with their metallic component.
- the non-shaped treatment substances are usually used in block or tablet form, optionally with metal additives which have a weighting effect.
- the invention is therefore based on the object of avoiding the disadvantages of the known processes, in particular the aforementioned processes, and of providing an efficient process which is as simple as it is economical to use in the foundry practice of light metal casting.
- a method of the aforementioned type for degassing and refining melts made of aluminum or magnesium and their alloys by treatment with aluminum chloride according to the invention is designed in such a way that a molding made of anhydrous aluminum chloride is introduced into the melt.
- the molding Since the molding has a lower density than the light metal or light metal alloy melt, it is expedient to bring it under the surface of the melt with a diving bell known per se and to hold it there until complete evaporation. Binder-free compacts are particularly suitable as moldings. In the process according to the invention, however, it is also advantageous to use moldings which are cast articles produced from an aluminum chloride melt at elevated pressure. Granules can also be used.
- moldings are used in the method according to the invention, which have been provided with a moisture-proof covering.
- the casing expediently consists of a metallic material corresponding to the metal of the melts, for example of aluminum or magnesium.
- the covering can be designed, for example, as a film jacket, container or crimp sleeve.
- the shape of the envelope is not critical and generally depends on the nature of the manufacturing process for the molding. For example, a continuously produced extrusion or casting strand made of anhydrous aluminum chloride can suitably be used in e.g.
- thin-walled aluminum tubes are inserted and squeezed in certain lengths.
- the metal-sheathed or water-shrouded aluminum chloride molded article is generally preferred in the treatment of light metal melts because of the achievable higher purity of the melt, the sheathing with an organic polymeric material may also be sufficient in some cases.
- press strands or cast strands made of anhydrous aluminum chloride can be welded into a film of halogen-containing vinyl polymer in certain amounts.
- the treatment vessel for the light metal melt can be provided in a manner known per se with a lid which also serves to recover the sublimed aluminum chloride with suitable cooling.
- the active ingredient can develop its activity from the start of the melt treatment, that no moisture is introduced into the melt and therefore no additional ones to be removed Impurities are created, furthermore that no molten metal is lost through the formation of halogen compounds, furthermore the treatment is completed in a few minutes with practically complete flushing out of solid contaminating particles and with virtually complete expulsion of the dissolved hydrogen. It also provides a more environmentally friendly process and reduces or eliminates potential health hazards.
- melt of an alloy of the type G-AlMg 3 a compact made of anhydrous aluminum chloride in a weight of 250 g, packed in a tin made of aluminum sheet, was introduced to the bottom of the melting vessel with the aid of a conventional diving bell at 750 ° C.
- the reaction time was a few minutes.
- Starting gas content of the melt 0.22 ml H2 / 100 g
- Gas content after treatment 0.06 ml H2 / 100 g
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Entgasen und Raffinieren von Schmelzen aus Aluminium oder Magnesium und deren LegierungenThe invention relates to a method for degassing and refining melts made of aluminum or magnesium and their alloys
Es ist bekannt, daß die Behandlung von Schmelzen des Aluminiums und Magnesiums sowie deren Legierungen mit Stickstoff, Chlorgas oder mit Chlor abspaltenden Mitteln, wie Metallchloride, chlorhaltige organische Verbindungen, einen günstigen Effekt auf die Dichtigkeit des Gusses bewirkt. Eine derartige Behandlung entfernt gelöste Gase, insbesondere Wasserstoff, wie auch oxidische und andere feste Teilchen aus der Schmelze (DE-PS 733616, DE-PS 589 988). Die bekannten Verfahren zur Entfernung des Wasserstoffs aus Leichtmetall-Legierungsschmelzen sind entweder sehr aufwendig und im Betrieb nur schwierig zu handhaben, oder sie vermeiden die Gasporosität nicht mit der genügenden Betriebssicherheit.It is known that the treatment of melts of aluminum and magnesium and their alloys with nitrogen, chlorine gas or with chlorine-releasing agents, such as metal chlorides, chlorine-containing organic compounds, has a favorable effect on the tightness of the casting. Such a treatment removes dissolved gases, in particular hydrogen, as well as oxidic and other solid particles from the melt (DE-PS 733616, DE-PS 589 988). The known methods for removing the hydrogen from light metal alloy melts are either very complex and difficult to handle during operation, or they do not avoid gas porosity with sufficient operational reliability.
Chlorgas hat relativ aufwendige Installationen zur Voraussetzung, wirkt äußerst korrosiv und ist ein gefährlicher Arbeitsstoff. Hexachlorethan als die wohl bekannteste Chlor-abspaltende Substanz besitzt einen wesentlich geringeren Wirkungsgrad als das Chlor und bildet zudem Zersetzungsprodukte, wie z.B. Hexachlorbenzol, Oktochlorstyrol und ähnliche hochchlorierte Verbindungen, welche die Umwelt außerordentlich belasten.Chlorine gas requires relatively complex installations, is extremely corrosive and is a dangerous substance. Hexachloroethane as the most well-known chlorine-releasing substance has a much lower efficiency than chlorine and also forms decomposition products, e.g. Hexachlorobenzene, octochlorostyrene and similar highly chlorinated compounds that are extremely harmful to the environment.
Schwermetall-Chloride sind zwar weitgehend frei von vorgenannten Nachteilen, sind jedoch mehr oder weniger in unerwünschter Weise hygroskopisch wie auch toxisch und verunreinigen zudem die Schmelzen mit ihrer metallischen Komponente. Die nicht gesförmigen Behandlungsstoffe werden üblicherweise in Block- oder Tablettenform, gegebenenfalls mit beschwerend wirkenden Metallzusätzen, verwendet.Heavy metal chlorides are largely free from the aforementioned disadvantages, but are more or less undesirably hygroscopic as well as toxic and also contaminate the melts with their metallic component. The non-shaped treatment substances are usually used in block or tablet form, optionally with metal additives which have a weighting effect.
Den vorgenannten Behandlungsstoffen ist gemeinsam, daß sie sich bei ihrer Reaktion mit aluminiumhaltigen Schmelzen zu Aluminiumchlorid umsetzen, welches das die Schmelzen eigentlich durchspülende Gas ist. Auf diese Weise wird Aluminium und/oder Magnesium in nennenswerter Menge verbraucht. Es ist daher auch bekannt, beide Behandlungsmethoden zu kombinieren und in einer Art Trägergasverfahren einen Strom von mit dampfförmigem Aluminiumchlorid beladenen Stickstoffstrom durch die Schmelze hindurchzuperlen ("Chem. Abstr.", Vol. 86, Ref. 77381 h, Vol. 84, Ref. 183800 n). Es ist ersichtlich, daß dies ein technologisch aufwendiger und im Hinblick auf die gegebenen Dampfdruckverhältnisse zudem zeitraubender Prozeß ist, da Aluminiumchlorid eine äußerst hydroskopische Substanz ist, die unter Normaldruck nicht schmilzt, sondern bei etwa 190°C sublimiert.The aforementioned treatment substances have in common that when they react with aluminum-containing melts they convert to aluminum chloride, which is the gas that actually flushes through the melts. In this way, aluminum and / or magnesium is consumed in significant quantities. It is therefore also known to combine both treatment methods and to bubble a stream of nitrogen stream loaded with vaporous aluminum chloride through the melt in a kind of carrier gas process ("Chem. Abstr.", Vol. 86, Ref. 77381 h, Vol. 84, Ref. 183800 n). It can be seen that this is a technologically complex and time-consuming process in view of the prevailing vapor pressure conditions, since aluminum chloride is an extremely hydroscopic substance that does not melt under normal pressure but sublimes at about 190 ° C.
Der Erfindung liegt daher die Aufgabe zugrunde, die Nachteile der bekannten, insbesondere vorgenannten Verfahren zu vermeiden und ein in der Gießereipraxis des Leichtmetallgusses ebenso einfach wie wirtschaftlich zu handhabendes, effizientes Verfahren bereitzustellen.The invention is therefore based on the object of avoiding the disadvantages of the known processes, in particular the aforementioned processes, and of providing an efficient process which is as simple as it is economical to use in the foundry practice of light metal casting.
Zur Lösung dieser Aufgabe wird ein Verfahren der vorgenannten Art zum Entgasen und Raffinieren von Schmelzen aus Aluminium oder Magnesium und deren Legierungen durch Behandeln mit Aluminiumchlorid gemäß der Erfindung in der Weise ausgestaltet, daß ein Formling aus wasserfreiem Aluminiumchlorid in die Schmelze eingebracht wird.To achieve this object, a method of the aforementioned type for degassing and refining melts made of aluminum or magnesium and their alloys by treatment with aluminum chloride according to the invention is designed in such a way that a molding made of anhydrous aluminum chloride is introduced into the melt.
Da der Formling eine geringere Dichte besitzt,als die Leichtmetall- bzw. Leichtmetall-Legierungsschmelze hat, wird er zweckmäßig mit einer an sich bekannten Tauchglocke unter die Oberfläche der Schmelze gebracht und dort bis zur völligen Verdampfung gehalten. Als Formlinge eignen sich insbesondere bindemittelfreie Preßkörper. Mit Vorteil werden in dem erfindungsgemäßen Verfahren aber auch Formlinge eingesetzt, die bei erhöhtem Druck aus einer Aluminiumchloridschmelze hergestellte Gießkörper sind. Granulate können ebenfalls verwendet werden.Since the molding has a lower density than the light metal or light metal alloy melt, it is expedient to bring it under the surface of the melt with a diving bell known per se and to hold it there until complete evaporation. Binder-free compacts are particularly suitable as moldings. In the process according to the invention, however, it is also advantageous to use moldings which are cast articles produced from an aluminum chloride melt at elevated pressure. Granules can also be used.
Im allgemeinen genügt die verkleinerte und verdichtete Oberfläche des Formlings bereits, um die Einwirkung der Luftfeuchtigkeit für eine hinreichende Zeit bei der Vorbereitung der Behandlung weitgehend auszuschließen. Nach einer besonders vorteilhaften Ausgestaltung der Erfindung werden jedoch in dem erfindungsgemäßen Verfahren Formlinge verwendet, die mit einer Feuchtigkeit ausschließenden Umhüllung versehen worden sind. Zweckmäßig besteht die Umhüllung aus einem metallischen Werkstoff entsprechend dem Metall der Schmelzen, beispielsweise aus Aluminium oder Magnesium. Die Umhüllung kann beispielsweise als Folienmantel, Behälter oder Quetschhülse ausgebildet sein. Die Form der Umhüllung ist nicht kritisch und richtet sich im allgemeinen nach der Eigenart des Herstellungsverfahrens für den Formling. Beispielsweise kann ein kontinuierlich hergestellter Preßstrang oder Gießstrang aus wasserfreiem Aluminiumchlorid zweckmäßig in z.B. dünnwandige Aluminiumrohre eingeführt und in bestimmten Längen abgequetscht werden. Zwar ist der metallummantelte oder in metallische Hüllen eingebrachte Formling aus wasserfreiem Aluminiumchlorid im allgemeinen bei der Behandlung von Leichtmetallschmelzen aus Gründen der erzielbaren höheren Reinheit der Schmelze vorzuziehen, doch kann in manchen Fällen auch die Ummantelung mit einem organischen polymeren Material ausreichend sein. Beispielsweise können Preßstränge oder Gießstränge aus wasserfreiem Aluminiumchlorid in eine Folie aus halogenhaltigem Vinylpolymerisat in bestimmten Mengen eingeschweißt werden.In general, the reduced and compacted surface of the molding is already sufficient to largely rule out the effects of atmospheric moisture for a sufficient time when preparing the treatment. According to a particularly advantageous embodiment of the invention, however, moldings are used in the method according to the invention, which have been provided with a moisture-proof covering. The casing expediently consists of a metallic material corresponding to the metal of the melts, for example of aluminum or magnesium. The covering can be designed, for example, as a film jacket, container or crimp sleeve. The shape of the envelope is not critical and generally depends on the nature of the manufacturing process for the molding. For example, a continuously produced extrusion or casting strand made of anhydrous aluminum chloride can suitably be used in e.g. thin-walled aluminum tubes are inserted and squeezed in certain lengths. Although the metal-sheathed or water-shrouded aluminum chloride molded article is generally preferred in the treatment of light metal melts because of the achievable higher purity of the melt, the sheathing with an organic polymeric material may also be sufficient in some cases. For example, press strands or cast strands made of anhydrous aluminum chloride can be welded into a film of halogen-containing vinyl polymer in certain amounts.
In dem erfindungsgemäßen Verfahren kann das Behandlungsgefäß für die Leichtmetallschmelze in an sich bekannter Weise mit einem Deckel versehen werden, der auch zur Rückgewinnung des sublimierten Aluminiumchlorids bei geeigneter Kühlung dient.In the process according to the invention, the treatment vessel for the light metal melt can be provided in a manner known per se with a lid which also serves to recover the sublimed aluminum chloride with suitable cooling.
Die Vorteile des erfindungsgemäßen Verfahrens sind darin zu sehen, daß der Wirkstoff von Beginn der Schmelzebehandlung an seine Aktivität entfalten kann, daß keine Feuchtigkeit in die Schmelze eingebracht wird und dadurch keine zusätzlich zu entfernenden Verunreinigungen geschaffen werden, ferner daß kein Schmelzmetall durch Bildung von Halogenverbindungen verloren geht, ferner die Behandlung in wenigen Minuten unter praktisch vollständiger Ausschwemmung von festen verunreinigenden Teilchen und unter praktisch völliger Austreibung des gelösten Wasserstoffs beendet ist. Des weiteren wird ein umweltfreundlicheres Verfahren bereitgestellt und mögliche Gefahren für die Gesundheit des Arbeitspersonals verringert oder beseitigt.The advantages of the process according to the invention can be seen in the fact that the active ingredient can develop its activity from the start of the melt treatment, that no moisture is introduced into the melt and therefore no additional ones to be removed Impurities are created, furthermore that no molten metal is lost through the formation of halogen compounds, furthermore the treatment is completed in a few minutes with practically complete flushing out of solid contaminating particles and with virtually complete expulsion of the dissolved hydrogen. It also provides a more environmentally friendly process and reduces or eliminates potential health hazards.
Die Erfindung wird anhand der nachstehenden Beispiele näher und beispielhaft erläutert.The invention is explained in more detail and by way of example using the examples below.
In 500 kg Schmelze einer Legierung vom Typ G-AlMg 3 wurde bei 750°C ein Preßling aus wasserfreiem Aluminiumchlorid im Gewicht von 250 g, verpackt in einer Dose aus Aluminiumblech, mit Hilfe einer Tauchglocke herkömmlicher Form bis auf den Boden des Schmelzgefäßes eingeführt. Die Reaktionsdauer betrug wenige Minuten.
Ausgangsgasgehalt der Schmelze 0,22 ml H₂/100 g
Gasgehalt nach der Behandlung 0,06 ml H₂/100 gIn 500 kg melt of an alloy of the type G-AlMg 3, a compact made of anhydrous aluminum chloride in a weight of 250 g, packed in a tin made of aluminum sheet, was introduced to the bottom of the melting vessel with the aid of a conventional diving bell at 750 ° C. The reaction time was a few minutes.
Starting gas content of the melt 0.22 ml H₂ / 100 g
Gas content after treatment 0.06 ml H₂ / 100 g
In eine Schmelze aus Reinaluminium im Gewicht von 1 t wurden bei 730°C 2 Preßlinge aus wasserfreiem Aluminiumchlorid im Gewicht von je 250 g, jeweils verpackt in einer Dose aus Aluminiumblech, nacheinander mit Hilfe einer Tauchglocke herkömmlicher Form bis auf den Boden des Schmelzgefäßes eingeführt.In a melt of pure aluminum in the weight of 1 t, 2 compacts of anhydrous aluminum chloride, each weighing 250 g, each packed in a tin made of aluminum sheet, were successively introduced to the bottom of the melting vessel with the help of a diving bell of conventional shape at 730 ° C.
Gehalt der Schmelze an oxidischen Verunreinigungen vor der Behandlung, ausgedrückt in g/t Sauerstoff 8Melt content of oxidic impurities before treatment, expressed in g / t oxygen 8
Sauerstoffgehalt der Schmelze nach der Behandlung ≦1Oxygen content of the melt after treatment ≦ 1
Claims (5)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19863617056 DE3617056A1 (en) | 1986-05-21 | 1986-05-21 | METHOD FOR DEGASSING AND REFINING LIGHT METAL MELTS |
| DE3617056 | 1986-05-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0248994A1 true EP0248994A1 (en) | 1987-12-16 |
Family
ID=6301281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87104952A Withdrawn EP0248994A1 (en) | 1986-05-21 | 1987-04-03 | Process for degassing and refining light-metal melts |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0248994A1 (en) |
| DE (1) | DE3617056A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000065110A1 (en) * | 1999-04-24 | 2000-11-02 | Arndt Schäfer Chemie & Umwelt Gmbh | Removal of impurities from molten masses of metals or alloys using low melting point aluminum trichloride containing salt mixtures |
| CN101864521A (en) * | 2010-05-09 | 2010-10-20 | 中国铝业股份有限公司 | Aluminum and aluminum alloy flat section ingot sawdust collection and furnace return remelting method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4310054C2 (en) * | 1993-03-27 | 1994-12-22 | Guenther Prof Dipl Chem Kraft | Process and agent for the treatment of aluminum and aluminum alloy melts |
| DE4438539C1 (en) * | 1994-10-28 | 1995-11-09 | Kraft Guenther | Aluminium or alloy melt purificn. to remove trace metals, hydrogen and oxidic plankton |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR809443A (en) * | 1935-11-21 | 1937-03-03 | Aluminum purification process | |
| FR2312570A1 (en) * | 1975-05-28 | 1976-12-24 | Servimetal | Aluminium alloy mfr. using prealloyed briquettes - contg. flux which evolves gas, ensuring uniform distribution of alloys in melt |
| US4417923A (en) * | 1981-09-14 | 1983-11-29 | Spolek Pro Chemickou A Hutni Vyrobu, Narodni Podnik | Solid refining agents for the refining of aluminum and alloys thereof and method of preparing said agents |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2056233A (en) * | 1935-01-10 | 1936-10-06 | Aluminum Co Of America | Degassing molten aluminum and its alloys |
| DE2700243A1 (en) * | 1977-01-05 | 1978-07-13 | Juergens Walter | Pelletised agents for treating molten metals - where pellets are joined together to ensure their entry into the melt |
| DE3409488A1 (en) * | 1984-03-15 | 1985-09-19 | Dr. Riedelbauch & Stoffregen·Gießereichemische Erzeugnisse GmbH & Co KG, 6554 Meisenheim | Process for the nitrogen purging of melts of aluminium and its alloys |
-
1986
- 1986-05-21 DE DE19863617056 patent/DE3617056A1/en active Granted
-
1987
- 1987-04-03 EP EP87104952A patent/EP0248994A1/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR809443A (en) * | 1935-11-21 | 1937-03-03 | Aluminum purification process | |
| FR2312570A1 (en) * | 1975-05-28 | 1976-12-24 | Servimetal | Aluminium alloy mfr. using prealloyed briquettes - contg. flux which evolves gas, ensuring uniform distribution of alloys in melt |
| US4417923A (en) * | 1981-09-14 | 1983-11-29 | Spolek Pro Chemickou A Hutni Vyrobu, Narodni Podnik | Solid refining agents for the refining of aluminum and alloys thereof and method of preparing said agents |
Non-Patent Citations (1)
| Title |
|---|
| CHEMICAL ABSTRACTS, Band 86, 1977, Seite 313, Zusammenfassung Nr. 77381h, Columbus, Ohio, US; & JP-A-76 128 613 (SHOWA DENKO K.K.) 09-11-1976 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000065110A1 (en) * | 1999-04-24 | 2000-11-02 | Arndt Schäfer Chemie & Umwelt Gmbh | Removal of impurities from molten masses of metals or alloys using low melting point aluminum trichloride containing salt mixtures |
| CN101864521A (en) * | 2010-05-09 | 2010-10-20 | 中国铝业股份有限公司 | Aluminum and aluminum alloy flat section ingot sawdust collection and furnace return remelting method |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3617056A1 (en) | 1987-11-26 |
| DE3617056C2 (en) | 1989-09-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE3024697C2 (en) | ||
| US8316917B2 (en) | Solid composition having enhanced physical and electrical properties | |
| DE2643075A1 (en) | FLUX AND PROCESS FOR REMOVING ALKALINE AND EARTH ALUMINUM METALS FROM ALUMINUM AND ITS ALLOYS | |
| EP0248994A1 (en) | Process for degassing and refining light-metal melts | |
| DE2659390A1 (en) | METHOD OF RECOVERING PLATINUM FROM USED CATALYSTS | |
| US4417923A (en) | Solid refining agents for the refining of aluminum and alloys thereof and method of preparing said agents | |
| DE3822616C2 (en) | Removal of lithium nitride from lithium metal | |
| DE2701260A1 (en) | METHOD FOR REMOVING IMPURITIES FROM ALUMINUM MELTS | |
| DE2014772C3 (en) | Process for separating iron from impure. Aluminum chloride containing ferric chloride | |
| DE19918766C2 (en) | Process for removing impurities from melts of metals or alloys | |
| DE3004120A1 (en) | METHOD FOR REDUCING THE FOREIGN MATERIAL CONTENT, MAINLY ALKALI METAL AND HYDROGEN CONTENT, AND THE CONTENT OF SOLID, NON-METAL FOREIGN MATERIALS, IN PARTICULAR ALUMINUM ALIGNMENT ALIGNMENT ALIGNMENT | |
| DE4310054C2 (en) | Process and agent for the treatment of aluminum and aluminum alloy melts | |
| DE1139475B (en) | Process for cleaning impure silicon | |
| EP0583670B1 (en) | Metallothermic reaction mixture | |
| CA1103934A (en) | Method of reducing the sodium content in aluminium and aluminium alloys | |
| EP0028315B1 (en) | Process for the manufacture of magnesium phosphide | |
| DE2829372A1 (en) | PROCESS FOR MANUFACTURING YTTRIUM METAL AND ITS ALLOYS | |
| DE1027407B (en) | Process for the grain refining of aluminum alloys | |
| DE3630711C1 (en) | Process for degassing and refining molten aluminium and alloys thereof | |
| DE1918107A1 (en) | Process for the production of difficult-to-melt metals | |
| DE3610503C2 (en) | ||
| DE3409488A1 (en) | Process for the nitrogen purging of melts of aluminium and its alloys | |
| DE4438539C1 (en) | Aluminium or alloy melt purificn. to remove trace metals, hydrogen and oxidic plankton | |
| EP0134403A1 (en) | Method of preparing a lithium-aluminium compound by powder metallurgy, and its use | |
| SE178621C1 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): FR GB IT |
|
| 17P | Request for examination filed |
Effective date: 19880115 |
|
| 17Q | First examination report despatched |
Effective date: 19891012 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
| 18W | Application withdrawn |
Withdrawal date: 19900904 |
|
| R18W | Application withdrawn (corrected) |
Effective date: 19900904 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: KRAFT, GUENTHER, PROF. DR. DIPL.-CHEM. |