EP0248994A1 - Verfahren zum Entgasen und Raffinieren von Leichtmetallschmelzen - Google Patents

Verfahren zum Entgasen und Raffinieren von Leichtmetallschmelzen Download PDF

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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Withdrawn
Application number
EP87104952A
Other languages
German (de)
English (en)
French (fr)
Inventor
Günther Prof. Dr. Dipl.-Chem. Kraft
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dr Riedelbauch & Stoffregen GmbH
Original Assignee
Dr Riedelbauch & Stoffregen GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dr Riedelbauch & Stoffregen GmbH filed Critical Dr Riedelbauch & Stoffregen GmbH
Publication of EP0248994A1 publication Critical patent/EP0248994A1/de
Withdrawn legal-status Critical Current

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)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP87104952A 1986-05-21 1987-04-03 Verfahren zum Entgasen und Raffinieren von Leichtmetallschmelzen Withdrawn EP0248994A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3617056 1986-05-21
DE19863617056 DE3617056A1 (de) 1986-05-21 1986-05-21 Verfahren zum entgasen und raffinieren von leichtmetallschmelzen

Publications (1)

Publication Number Publication Date
EP0248994A1 true EP0248994A1 (de) 1987-12-16

Family

ID=6301281

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87104952A Withdrawn EP0248994A1 (de) 1986-05-21 1987-04-03 Verfahren zum Entgasen und Raffinieren von Leichtmetallschmelzen

Country Status (2)

Country Link
EP (1) EP0248994A1 (enrdf_load_stackoverflow)
DE (1) DE3617056A1 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000065110A1 (de) * 1999-04-24 2000-11-02 Arndt Schäfer Chemie & Umwelt Gmbh Entfernung von verunreinigungen aus schmelzen von metallen oder legierungen mittels niedrigschmelzender, aluminium-trichlorid enthaltender salzgemische
CN101864521A (zh) * 2010-05-09 2010-10-20 中国铝业股份有限公司 一种铝及铝合金扁锭锯屑收集回炉重熔方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4310054C2 (de) * 1993-03-27 1994-12-22 Guenther Prof Dipl Chem Kraft Verfahren und Mittel zur Behandlung von Aluminium- und Aluminiumlegierungsschmelzen
DE4438539C1 (de) 1994-10-28 1995-11-09 Kraft Guenther Verfahren und Mittel zur reinigenden Behandlung von Schmelzen des Aluminiums und seiner Legierungen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR809443A (fr) * 1935-11-21 1937-03-03 Procédé d'épuration de l'aluminium
FR2312570A1 (fr) * 1975-05-28 1976-12-24 Servimetal Pastilles composites facilitant l'addition d'elements d'alliages dans l'aluminium et les alliages legers
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)

* Cited by examiner, † Cited by third party
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 (de) * 1977-01-05 1978-07-13 Juergens Walter Schmelzbehandlungspraeparate
DE3409488A1 (de) * 1984-03-15 1985-09-19 Dr. Riedelbauch & Stoffregen·Gießereichemische Erzeugnisse GmbH & Co KG, 6554 Meisenheim Verfahren zur stickstoffspuelung von schmelzen aus aluminium und seinen legierungen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR809443A (fr) * 1935-11-21 1937-03-03 Procédé d'épuration de l'aluminium
FR2312570A1 (fr) * 1975-05-28 1976-12-24 Servimetal Pastilles composites facilitant l'addition d'elements d'alliages dans l'aluminium et les alliages legers
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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000065110A1 (de) * 1999-04-24 2000-11-02 Arndt Schäfer Chemie & Umwelt Gmbh Entfernung von verunreinigungen aus schmelzen von metallen oder legierungen mittels niedrigschmelzender, aluminium-trichlorid enthaltender salzgemische
CN101864521A (zh) * 2010-05-09 2010-10-20 中国铝业股份有限公司 一种铝及铝合金扁锭锯屑收集回炉重熔方法

Also Published As

Publication number Publication date
DE3617056C2 (enrdf_load_stackoverflow) 1989-09-21
DE3617056A1 (de) 1987-11-26

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Designated state(s): FR GB IT

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Effective date: 19880115

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Effective date: 19891012

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18W Application withdrawn

Withdrawal date: 19900904

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Effective date: 19900904

RIN1 Information on inventor provided before grant (corrected)

Inventor name: KRAFT, GUENTHER, PROF. DR. DIPL.-CHEM.