EP0090750B1 - Procédé d'obtention d'aluminium de très haute pureté en éléments eutectiques - Google Patents

Procédé d'obtention d'aluminium de très haute pureté en éléments eutectiques Download PDF

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Publication number
EP0090750B1
EP0090750B1 EP83420054A EP83420054A EP0090750B1 EP 0090750 B1 EP0090750 B1 EP 0090750B1 EP 83420054 A EP83420054 A EP 83420054A EP 83420054 A EP83420054 A EP 83420054A EP 0090750 B1 EP0090750 B1 EP 0090750B1
Authority
EP
European Patent Office
Prior art keywords
ppm
metal
elements
eutectic
iron
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
Application number
EP83420054A
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German (de)
English (en)
French (fr)
Other versions
EP0090750A1 (fr
Inventor
Jean Plateau
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.)
Rio Tinto France SAS
Original Assignee
Aluminium Pechiney SA
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 Aluminium Pechiney SA filed Critical Aluminium Pechiney SA
Priority to AT83420054T priority Critical patent/ATE21529T1/de
Publication of EP0090750A1 publication Critical patent/EP0090750A1/fr
Application granted granted Critical
Publication of EP0090750B1 publication Critical patent/EP0090750B1/fr
Expired legal-status Critical Current

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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

Definitions

  • the present invention relates to a process for obtaining very high purity aluminum in eutectic elements by segregation.
  • the efficiency of the purification generally results in the value of the purification coefficient C o / Cg, where C s is the concentration of a given impurity in the pure product obtained, and C o is the concentration of the same impurity in the metal used, the higher this coefficient, the better the treatment efficiency.
  • This process for obtaining very high purity aluminum that is to say containing at most 10 ppm in each of the iron and silicon eutectic elements, consists in subjecting an aluminum containing less than 200 ppm of the same elements to an operation of segregation, but characterized in that at least one eutectic element having a purification coefficient at least 7 in quantity is added to the molten aluminum, such that its concentration in the liquid after addition is between a minimum avoiding the mass crystallization and eutectics.
  • the process of the invention uses an aluminum which is already very pure, for example which has already undergone a first purification which has made it possible to bring its content of total impurities to 200, and even up to 100 ppm or less.
  • This aluminum may for example have a content of each of the iron and silicon elements close to 50 ppm, but contents higher or lower than this value in any of the impurities are also possible.
  • This first purification can be obtained for example by a segregation operation identical to that described in the French patent cited above.
  • the starting metal may also have been subjected to a treatment to remove peritectic impurities such as titanium and vanadium for example.
  • Such a metal is then melted and at least one eutectic element is added to the liquid, in the absence of any crystallization.
  • This element is preferably chosen from the group consisting of iron and copper, but the simultaneous addition of these two elements can also be envisaged. What is important is that this element should not have a disturbing concentration after the final operation of segregation. Thus it is possible to add an element having a very high purification coefficient and which can therefore be easily eliminated during the application of the process; one can also add an element having a lower purification coefficient provided that it has no harmful influence, even if its concentration remains high. In the first case, iron can be added whose coefficient is close to 30.
  • copper can be used whose coefficient is close to 7 but which, up to contents of 50 ppm, is not not annoying in certain applications and can even be beneficial in the case where aluminum is intended for the manufacture of electrolytic capacitors of medium and high voltage. We can obviously add these two elements simultaneously.
  • the quantity added must obviously be such that the concentration of the liquid in this element before crystallization is lower than that of the eutectic, otherwise, as the liquid-solid equilibrium diagrams indicate, the crystals obtained will first be more impure than the initial mother liquid, then there will follow a deposit of crystals of eutectic composition and there will therefore be no possible purification.
  • this quantity should also not be too low, otherwise the effect of the addition will not meet the desired objective, namely to avoid mass crystallization which does not allow proper operation to be carried out.
  • These additions will depend on the element added and the intended application for the purified metal. For example, in the case of iron, additions of about 100 to 200 ppm, or even 500 ppm, are suitable. However, in the case of copper, they can go beyond 100 ppm and reach 2000 ppm if the aluminum is intended, for example, for the manufacture of capacitors.
  • the addition of the eutectic element can be done either in the solid state or in the liquid state and in any suitable form such as pure element, alloy of the elements or master alloy based on aluminum.
  • the homogeneity of the liquid after addition is achieved by any suitable stirring or stirring means.
  • an aluminum is used containing approximately 20 ppm of silicon and 15 ppm of iron obtained by a first purification operation by segregation. If we add 200 ppm of iron to it and subject it to a new segregation operation, we see that we can bring the silicon to around 5 ppm. As, moreover, the purification coefficient of iron is significantly higher than that of silicon, the fact that iron has been added does not degrade the quality of the final product but, on the contrary, leads to a content close to that silicon and this, with a yield of the order of 70%.
  • the present invention finds its application in particular in obtaining aluminum of very high purity in eutectic elements and containing in particular less than 10 ppm of iron and silicon and intended in particular for the manufacture of high and medium voltage capacitors.

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)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Light Receiving Elements (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Semiconductor Integrated Circuits (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Powder Metallurgy (AREA)
EP83420054A 1982-03-31 1983-03-24 Procédé d'obtention d'aluminium de très haute pureté en éléments eutectiques Expired EP0090750B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83420054T ATE21529T1 (de) 1982-03-31 1983-03-24 Verfahren zur gewinnung von aluminium hoher reinheit in eutektischen elementen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8205895 1982-03-31
FR8205895A FR2524490B1 (fr) 1982-03-31 1982-03-31 Procede d'obtention d'aluminium de tres haute purete en elements eutectiques

Publications (2)

Publication Number Publication Date
EP0090750A1 EP0090750A1 (fr) 1983-10-05
EP0090750B1 true EP0090750B1 (fr) 1986-08-20

Family

ID=9272765

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83420054A Expired EP0090750B1 (fr) 1982-03-31 1983-03-24 Procédé d'obtention d'aluminium de très haute pureté en éléments eutectiques

Country Status (17)

Country Link
US (1) US4444585A (enrdf_load_stackoverflow)
EP (1) EP0090750B1 (enrdf_load_stackoverflow)
JP (1) JPS58181835A (enrdf_load_stackoverflow)
KR (1) KR860001306B1 (enrdf_load_stackoverflow)
AT (1) ATE21529T1 (enrdf_load_stackoverflow)
AU (1) AU551209B2 (enrdf_load_stackoverflow)
BR (1) BR8301579A (enrdf_load_stackoverflow)
CA (1) CA1185436A (enrdf_load_stackoverflow)
DE (1) DE3365393D1 (enrdf_load_stackoverflow)
ES (1) ES521015A0 (enrdf_load_stackoverflow)
FR (1) FR2524490B1 (enrdf_load_stackoverflow)
GR (1) GR77984B (enrdf_load_stackoverflow)
IN (1) IN158047B (enrdf_load_stackoverflow)
IS (1) IS1353B6 (enrdf_load_stackoverflow)
NO (1) NO160793C (enrdf_load_stackoverflow)
NZ (1) NZ203683A (enrdf_load_stackoverflow)
ZA (1) ZA832267B (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8710200D0 (en) * 1987-04-29 1987-06-03 Alcan Int Ltd Light metal alloy treatment

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE886077C (de) * 1940-07-05 1953-08-10 Vaw Ver Aluminium Werke Ag Verfahren zur Abtrennung von Eisen aus eisenhaltigen Aluminium-Legierungen
US2464610A (en) * 1940-07-08 1949-03-15 Spolek Method for producing aluminumsilicon alloys
GB557553A (en) * 1941-01-01 1943-11-26 British Non Ferrous Metals Res Improved method of and apparatus for refining metals and alloys
FR895518A (fr) * 1942-05-16 1945-01-26 Degussa Procédé pour l'épuration du plomb brut par filtration
FR976205A (fr) * 1948-10-02 1951-03-15 Alais & Froges & Camarque Cie Procédé d'élimination des impuretés métalliques dans des métaux ou des alliages, en particulier dans des alliages d'aluminium
DE816016C (de) * 1948-10-02 1951-10-08 Schmidt Gmbh Karl Verfahren zum Trennen des Aluminiums oder seiner Legierungen von Verunreinigungen mittels metallischer Loesungsmittel
FR979569A (fr) * 1948-12-03 1951-04-27 Alais & Froges & Camarque Cie Procédé d'élimination des éléments d'alliage indésirables ou des impuretés métalliques dans les métaux ou les alliages, en particulier dans les alliages d'aluminium
US3211547A (en) * 1961-02-10 1965-10-12 Aluminum Co Of America Treatment of molten aluminum
US3303019A (en) * 1964-04-23 1967-02-07 Aluminum Co Of America Purification of aluminum
FR1594154A (enrdf_load_stackoverflow) * 1968-12-06 1970-06-01
DE2401654C2 (de) * 1974-01-15 1975-11-20 Matthias 4150 Krefeld Welsch Verfahren und Vorrichtung zur Herstellung von Aluminium
GB1519999A (en) * 1974-09-30 1978-08-02 Commw Scient Ind Res Org Method for the continuous reflux reflux refining of metal
JPS5912731B2 (ja) * 1978-10-05 1984-03-26 株式会社神戸製鋼所 アルミニウム又はアルミニウム合金の精製法
US4221590A (en) * 1978-12-26 1980-09-09 Aluminum Company Of America Fractional crystallization process
NO158107C (no) * 1979-10-09 1988-07-13 Showa Aluminium Co Ltd Fremgangsmaate ved smelting av aluminium.

Also Published As

Publication number Publication date
IS2793A7 (is) 1983-10-02
US4444585A (en) 1984-04-24
CA1185436A (fr) 1985-04-16
NO831192L (no) 1983-10-03
NO160793C (no) 1989-05-31
BR8301579A (pt) 1983-12-06
ATE21529T1 (de) 1986-09-15
FR2524490B1 (fr) 1988-05-13
GR77984B (enrdf_load_stackoverflow) 1984-09-25
DE3365393D1 (en) 1986-09-25
ZA832267B (en) 1983-12-28
KR840004178A (ko) 1984-10-10
NZ203683A (en) 1986-06-11
IS1353B6 (is) 1989-04-19
AU551209B2 (en) 1986-04-17
KR860001306B1 (ko) 1986-09-11
JPH022937B2 (enrdf_load_stackoverflow) 1990-01-19
ES8405446A1 (es) 1984-06-01
NO160793B (no) 1989-02-20
IN158047B (enrdf_load_stackoverflow) 1986-08-23
JPS58181835A (ja) 1983-10-24
ES521015A0 (es) 1984-06-01
FR2524490A1 (fr) 1983-10-07
AU1299883A (en) 1983-10-06
EP0090750A1 (fr) 1983-10-05

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