EP0285566B1 - Procédé pour l'élimination de métaux alcalins et alcalino-terreux de bains d'aluminium - Google Patents

Procédé pour l'élimination de métaux alcalins et alcalino-terreux de bains d'aluminium Download PDF

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Publication number
EP0285566B1
EP0285566B1 EP88810195A EP88810195A EP0285566B1 EP 0285566 B1 EP0285566 B1 EP 0285566B1 EP 88810195 A EP88810195 A EP 88810195A EP 88810195 A EP88810195 A EP 88810195A EP 0285566 B1 EP0285566 B1 EP 0285566B1
Authority
EP
European Patent Office
Prior art keywords
carrier gas
melt
aluminium
gas
aluminum
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.)
Expired - Lifetime
Application number
EP88810195A
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German (de)
English (en)
Other versions
EP0285566A1 (fr
Inventor
Ernst Meier
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.)
3A Composites International AG
Original Assignee
Alusuisse Lonza Services Ltd
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 Alusuisse Lonza Services Ltd filed Critical Alusuisse Lonza Services Ltd
Priority to AT88810195T priority Critical patent/ATE73171T1/de
Publication of EP0285566A1 publication Critical patent/EP0285566A1/fr
Application granted granted Critical
Publication of EP0285566B1 publication Critical patent/EP0285566B1/fr
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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
    • C22B21/062—Obtaining aluminium refining using salt or fluxing agents
    • 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 removing alkali and alkaline earth metals from molten aluminum by introducing powdered aluminum fluoride into the melt by means of a carrier gas.
  • Electrolysis metal often has a considerable content of alkali and alkaline earth metals. Before the further processing of such contaminated melts, in particular before the casting into rolling bars, a reduction in the concentration of the undesired accompanying elements is inevitable in most cases.
  • the inventor has set himself the goal of creating a method of the type mentioned at the outset with which the consumption of aluminum fluoride can be kept as low as possible while maintaining a high cleaning efficiency.
  • the process should be able to be carried out without major retrofitting with existing melt treatment facilities.
  • the aluminum fluoride leads to the carrier gas in an amount of 1-10 grams per minute at a flow rate of the carrier gas between 40 and 200 liters per minute and the gas / powder mixture is continuously introduced into the melt kept at a temperature between 690 and 780 ° C by means of lances.
  • the entry of aluminum fluoride in the melt in the form of a gas / powder mixture has the result that the aluminum fluoride is enclosed in gas bubbles in the melt and settles within the individual gas bubbles in their lower part.
  • the actual chemical reaction between alkali and alkaline earth metals and the aluminum fluoride thus takes place at the gas / melt interface during the ascent phase of the gas bubbles to the melt surface. It is easy to see that a relatively small amount of aluminum fluoride is sufficient to cover the lower part of the gas bubble surface.
  • the aluminum fluoride introduced with a carrier gas is better wetted by the melt than is the case with processes with direct powder introduction. This also explains the high efficiency of melt cleaning that can be achieved with a small amount of aluminum fluoride in the process according to the invention.
  • aluminum fluoride of a lower degree of purity ie with a content of up to about 20% aluminum oxide, can also be used.
  • Cryolite with an excess content of aluminum fluoride is also suitable.
  • Argon optionally with the addition of a halogen-substituted hydrocarbon, such as CCl2F2, is used as the preferred carrier gas.
  • a halogen-substituted hydrocarbon such as CCl2F2
  • other gases or gas mixtures such as are customary in the melt treatment of aluminum, can also be used.
  • the addition of aluminum fluoride to the carrier gas can be carried out in a simple and effective manner via a jet mixer, as is described, for example, in US Pat. No. 4,295,883 for introducing gases into a melt stream.
  • the flowing gas creates a negative pressure in the jet mixer, whereby the aluminum fluoride is sucked into the jet mixer and swirled in the gas stream.
  • the method according to the invention is particularly suitable for the removal of sodium and lithium from aluminum-magnesium alloy melts and can be implemented with the usual smelting furnaces with purging gas treatment without major conversion.
  • the aluminum fluoride is fed into the gas supply line, possibly via a jet mixer.
  • the sodium content of the molten metal was 29 ppm before the treatment and 2 ppm after the treatment. During the treatment period of 2.5 hours, a total of only 525 grams of aluminum fluoride were consumed, corresponding to 18 grams per ton of molten metal treated.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • ing And Chemical Polishing (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Treating Waste Gases (AREA)
  • Processing Of Solid Wastes (AREA)

Claims (5)

1. Procédé d'enlèvement de métaux alcalins et alcalino-terreux de masses d'aluminium fondu par incorporation de fluorure d'aluminium pulvérulent dans la masse fondue au moyen d'un gaz vecteur,
caractérisé en ce que
le fluorure d'aluminium est ajouté continûment au gaz vecteur en une quantité de 1 à 10 g/min pour un débit du gaz vecteur compris entre 40 et 200 l/min et que le mélange gaz/poudre est introduit continûment au moyen de lances dans la masse fondue maintenue à une température comprise entre 690 et 780°C.
2. Procédé selon la revendication 1, caractérisé en ce que l'on utilise du fluorure d'aluminium de degré de pureté relativement faible ou de la cryolithe contenant un excès de fluorure d'aluminium.
3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que l'on utilise comme gaz vecteur de l'argon, le cas échéant avec addition d'un hydrocarbure halogène-substitué.
4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le fluorure d'aluminium est ajouté au gaz vecteur au moyen d'un agitateur au jet.
5. Application du procédé selon l'une des revendications 1 à 4 à l'enlèvement de sodium et de potassium dans des masses fondues d'alliage d'aluminium et de magnésium.
EP88810195A 1987-03-30 1988-03-24 Procédé pour l'élimination de métaux alcalins et alcalino-terreux de bains d'aluminium Expired - Lifetime EP0285566B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88810195T ATE73171T1 (de) 1987-03-30 1988-03-24 Verfahren zur entfernung von alkali- und erdalkalimetallen aus aluminiumschmelzen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH120987 1987-03-30
CH1209/87 1987-03-30

Publications (2)

Publication Number Publication Date
EP0285566A1 EP0285566A1 (fr) 1988-10-05
EP0285566B1 true EP0285566B1 (fr) 1992-03-04

Family

ID=4205058

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88810195A Expired - Lifetime EP0285566B1 (fr) 1987-03-30 1988-03-24 Procédé pour l'élimination de métaux alcalins et alcalino-terreux de bains d'aluminium

Country Status (6)

Country Link
US (1) US4832740A (fr)
EP (1) EP0285566B1 (fr)
AT (1) ATE73171T1 (fr)
DE (1) DE3868660D1 (fr)
IS (1) IS3325A7 (fr)
NO (1) NO171799C (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5085830A (en) * 1989-03-24 1992-02-04 Comalco Aluminum Limited Process for making aluminum-lithium alloys of high toughness
US4992241A (en) * 1990-03-15 1991-02-12 Alcan International Limited Recycling of metal matrix composites
NO176553C (no) * 1993-04-14 1995-04-26 Norsk Hydro As Injeksjonsutstyr
US6375712B1 (en) * 1998-05-27 2002-04-23 Helge O. Forberg Method of removal of light metals from aluminum
US6602318B2 (en) 2001-01-22 2003-08-05 Alcan International Limited Process and apparatus for cleaning and purifying molten aluminum
ES2215478B1 (es) * 2003-02-13 2005-10-01 Refineria Diaz, S.A. Fundente para el tratamiento de eliminacion de magnesio en aleaciones de aluminio.
JP4403713B2 (ja) * 2003-04-10 2010-01-27 株式会社豊田中央研究所 低Ｃａ含有Ａｌ合金の製造方法及び低Ｃａ含有Ａｌ合金製造用地金
US7785394B2 (en) * 2007-02-23 2010-08-31 Alcoa Inc. System and method for in-line molten metal processing using salt reactant in a deep box degasser
CN109692714A (zh) * 2017-10-20 2019-04-30 河南省格林沃特环保科技有限公司 一种废催化剂表面碱金属除去工艺

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR704792A (fr) * 1930-08-23 1931-05-26 Alais & Froges & Camarque Cie Procédé de fabrication d'aluminium et d'alliages contenant de l'aluminium, mais ne contenant pas de silicium, avec une dispersion très complète des constituants
FR724553A (fr) * 1930-12-24 1932-04-29 Alais & Froges & Camarque Cie Procédé de purification des metaux
DE900391C (de) * 1951-01-25 1953-12-28 Friedrich Winterhager Dipl Ing Verfahren und Vorrichtung zum Raffinieren schmelzfluessiger Metalle, insbesondere Leichtmetalle
US3305351A (en) * 1964-02-24 1967-02-21 Reynolds Metals Co Treatment of aluminum with aluminum fluoride particles
DE2206722A1 (de) * 1972-02-12 1973-08-16 Vaw Ver Aluminium Werke Ag Verfahren und vorrichtung zum reinigen, insbesondere zum entgasen, von schmelzfluessigem aluminium oder seinen legierungen
US3972709A (en) * 1973-06-04 1976-08-03 Southwire Company Method for dispersing gas into a molten metal
CS216519B2 (en) * 1979-02-08 1982-11-26 Magyar Aluminium Method of reducing the contents of impurities in the aluminium melt or aluminium alloys
CH641839A5 (de) * 1979-07-10 1984-03-15 Alusuisse Vorrichtung zur einleitung von gasen in metallschmelzen.
AT367458B (de) * 1980-05-27 1982-07-12 Ver Giessereiforschung Verfahren zur entfernung kleiner mengen von alkali- oder erdalkalimetallen aus aluminiumoderaluminiumlegierungsschmelzen
US4470846A (en) * 1981-05-19 1984-09-11 Alcan International Limited Removal of alkali metals and alkaline earth metals from molten aluminum
CA1188107A (fr) * 1981-05-19 1985-06-04 Ghyslain Dube Separations des metaux alcalins et de terre alcaline de l'aluminium en fusion
DE3367112D1 (en) * 1982-11-16 1986-11-27 Alcan Int Ltd Removal of impurities from molten aluminium
GB8417851D0 (en) * 1984-07-13 1984-08-15 Alcan Int Ltd Producing aluminium

Also Published As

Publication number Publication date
US4832740A (en) 1989-05-23
NO881370L (no) 1988-10-03
IS3325A7 (is) 1988-07-08
EP0285566A1 (fr) 1988-10-05
DE3868660D1 (de) 1992-04-09
ATE73171T1 (de) 1992-03-15
NO171799C (no) 1993-05-05
NO881370D0 (no) 1988-03-28
NO171799B (no) 1993-01-25

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