EP0090750A1 - Verfahren zur Gewinnung von Aluminium hoher Reinheit in eutektischen Elementen - Google Patents
Verfahren zur Gewinnung von Aluminium hoher Reinheit in eutektischen Elementen Download PDFInfo
- Publication number
- EP0090750A1 EP0090750A1 EP83420054A EP83420054A EP0090750A1 EP 0090750 A1 EP0090750 A1 EP 0090750A1 EP 83420054 A EP83420054 A EP 83420054A EP 83420054 A EP83420054 A EP 83420054A EP 0090750 A1 EP0090750 A1 EP 0090750A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- segregation
- ppm
- eutectic
- metal
- elements
- 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.)
- Granted
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
Definitions
- the present invention relates to a process for obtaining very high purity aluminum in eutectic elements by segregation.
- eutectic elements such as copper, iron, magnesium, silicon, zinc in aluminum of current purity when these are in hypoeutectic concentration.
- eutectic elements such as copper, iron, magnesium, silicon, zinc in aluminum of current purity when these are in hypoeutectic concentration.
- These crystals collect by gravity at the bottom of the container as they are formed and, by compacting them, a more or less compact purified solid is obtained, the purity of which tends to decrease as a function of the crystallized mass.
- the operation is generally continued until only a small fraction of the mother liquor remains.
- the purified mass can be separated from the remaining mother liquor or even the purified basket can be separated into. several fractions of different purity.
- the efficiency of the purification generally results in the value of the purification coefficient C / C, where C 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 put in artwork.
- C is the concentration of a given impurity in the pure product obtained
- C O is the concentration of the same impurity in the metal put in artwork. The higher this coefficient, the better the effectiveness of the treatment.
- This process for obtaining very high purity aluminum in eutectic elements consists in subjecting an already very pure aluminum to a segregation operation, but characterized in that the molten metal is added, before the segregation operation, and in order to make it more effective, at least one eutectic element in hypoeutectic quantity which either is eliminated very completely during this operation, or remains in the purified product at a non-annoying content for the intended use.
- the process of the invention uses an aluminum 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 an embarrassing concentration after the final operation of segregation.
- 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 amount 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 indicated by the liquid-solid equilibrium diagrams, the crystals obtained will first be more unclean as the initial mother liquid, then there will be a deposit of crystals of eutectic composition and there will therefore be no possible purification.
- additions should also not be too small, otherwise the effect of the addition will not meet the objective sought, namely to avoid mass crystallization which does not allow proper operation.
- 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)
- Light Receiving Elements (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Powder Metallurgy (AREA)
- Semiconductor Integrated Circuits (AREA)
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 true EP0090750A1 (de) | 1983-10-05 |
EP0090750B1 EP0090750B1 (de) | 1986-08-20 |
Family
ID=9272765
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83420054A Expired EP0090750B1 (de) | 1982-03-31 | 1983-03-24 | Verfahren zur Gewinnung von Aluminium hoher Reinheit in eutektischen Elementen |
Country Status (17)
Country | Link |
---|---|
US (1) | US4444585A (de) |
EP (1) | EP0090750B1 (de) |
JP (1) | JPS58181835A (de) |
KR (1) | KR860001306B1 (de) |
AT (1) | ATE21529T1 (de) |
AU (1) | AU551209B2 (de) |
BR (1) | BR8301579A (de) |
CA (1) | CA1185436A (de) |
DE (1) | DE3365393D1 (de) |
ES (1) | ES521015A0 (de) |
FR (1) | FR2524490B1 (de) |
GR (1) | GR77984B (de) |
IN (1) | IN158047B (de) |
IS (1) | IS1353B6 (de) |
NO (1) | NO160793C (de) |
NZ (1) | NZ203683A (de) |
ZA (1) | ZA832267B (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0289294A1 (de) * | 1987-04-29 | 1988-11-02 | Alcan International Limited | Behandlung von Aluminiumlegierungen |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
US2464610A (en) * | 1940-07-08 | 1949-03-15 | Spolek | Method for producing aluminumsilicon alloys |
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 |
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 |
DE816016C (de) * | 1948-10-02 | 1951-10-08 | Schmidt Gmbh Karl | Verfahren zum Trennen des Aluminiums oder seiner Legierungen von Verunreinigungen mittels metallischer Loesungsmittel |
DE886077C (de) * | 1940-07-05 | 1953-08-10 | Vaw Ver Aluminium Werke Ag | Verfahren zur Abtrennung von Eisen aus eisenhaltigen Aluminium-Legierungen |
US3303019A (en) * | 1964-04-23 | 1967-02-07 | Aluminum Co Of America | Purification of aluminum |
FR1594154A (de) * | 1968-12-06 | 1970-06-01 | ||
FR2445381A1 (fr) * | 1978-12-26 | 1980-07-25 | Aluminum Co Of America | Procede ameliore de purification d'aluminium impur par cristallisation fractionnee |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3211547A (en) * | 1961-02-10 | 1965-10-12 | Aluminum Co Of America | Treatment of molten aluminum |
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 |
NO158107C (no) * | 1979-10-09 | 1988-07-13 | Showa Aluminium Co Ltd | Fremgangsmaate ved smelting av aluminium. |
-
1982
- 1982-03-31 FR FR8205895A patent/FR2524490B1/fr not_active Expired
-
1983
- 1983-03-23 GR GR70880A patent/GR77984B/el unknown
- 1983-03-23 CA CA000424280A patent/CA1185436A/fr not_active Expired
- 1983-03-24 DE DE8383420054T patent/DE3365393D1/de not_active Expired
- 1983-03-24 AT AT83420054T patent/ATE21529T1/de not_active IP Right Cessation
- 1983-03-24 IS IS2793A patent/IS1353B6/is unknown
- 1983-03-24 NZ NZ203683A patent/NZ203683A/en unknown
- 1983-03-24 EP EP83420054A patent/EP0090750B1/de not_active Expired
- 1983-03-24 IN IN355/CAL/83A patent/IN158047B/en unknown
- 1983-03-25 ES ES521015A patent/ES521015A0/es active Granted
- 1983-03-25 US US06/478,785 patent/US4444585A/en not_active Expired - Lifetime
- 1983-03-28 BR BR8301579A patent/BR8301579A/pt not_active IP Right Cessation
- 1983-03-29 JP JP58053461A patent/JPS58181835A/ja active Granted
- 1983-03-30 ZA ZA832267A patent/ZA832267B/xx unknown
- 1983-03-30 NO NO831192A patent/NO160793C/no unknown
- 1983-03-30 AU AU12998/83A patent/AU551209B2/en not_active Ceased
- 1983-03-31 KR KR1019830001326A patent/KR860001306B1/ko not_active IP Right Cessation
Patent Citations (10)
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 |
US3303019A (en) * | 1964-04-23 | 1967-02-07 | Aluminum Co Of America | Purification of aluminum |
FR1594154A (de) * | 1968-12-06 | 1970-06-01 | ||
FR2445381A1 (fr) * | 1978-12-26 | 1980-07-25 | Aluminum Co Of America | Procede ameliore de purification d'aluminium impur par cristallisation fractionnee |
Non-Patent Citations (1)
Title |
---|
PATENTS ABSTRACTS OF JAPAN, vol. 4, no. 85, 18 juin 1980, page 118C15 & JP - A - 55 50442 (KOBE SEIKOSHO K.K.) 12-04-1980 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0289294A1 (de) * | 1987-04-29 | 1988-11-02 | Alcan International Limited | Behandlung von Aluminiumlegierungen |
Also Published As
Publication number | Publication date |
---|---|
AU1299883A (en) | 1983-10-06 |
EP0090750B1 (de) | 1986-08-20 |
FR2524490B1 (fr) | 1988-05-13 |
ZA832267B (en) | 1983-12-28 |
NO831192L (no) | 1983-10-03 |
DE3365393D1 (en) | 1986-09-25 |
ES8405446A1 (es) | 1984-06-01 |
IN158047B (de) | 1986-08-23 |
KR860001306B1 (ko) | 1986-09-11 |
FR2524490A1 (fr) | 1983-10-07 |
AU551209B2 (en) | 1986-04-17 |
GR77984B (de) | 1984-09-25 |
NZ203683A (en) | 1986-06-11 |
JPS58181835A (ja) | 1983-10-24 |
KR840004178A (ko) | 1984-10-10 |
NO160793B (no) | 1989-02-20 |
CA1185436A (fr) | 1985-04-16 |
ATE21529T1 (de) | 1986-09-15 |
NO160793C (no) | 1989-05-31 |
IS2793A7 (is) | 1983-10-02 |
US4444585A (en) | 1984-04-24 |
BR8301579A (pt) | 1983-12-06 |
IS1353B6 (is) | 1989-04-19 |
JPH022937B2 (de) | 1990-01-19 |
ES521015A0 (es) | 1984-06-01 |
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