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WO2000065110A1 - Elimination d'impuretes dans des masses fondues de metaux ou d'alliages au moyen de melanges de sels a faible point de fusion renfermant du trichlorure d'aluminium - Google Patents

Elimination d'impuretes dans des masses fondues de metaux ou d'alliages au moyen de melanges de sels a faible point de fusion renfermant du trichlorure d'aluminium Download PDF

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Publication number
WO2000065110A1
WO2000065110A1 PCT/EP2000/003122 EP0003122W WO0065110A1 WO 2000065110 A1 WO2000065110 A1 WO 2000065110A1 EP 0003122 W EP0003122 W EP 0003122W WO 0065110 A1 WO0065110 A1 WO 0065110A1
Authority
WO
WIPO (PCT)
Prior art keywords
metals
melt
aioci
kci
naci
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.)
Ceased
Application number
PCT/EP2000/003122
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German (de)
English (en)
Inventor
Helmut Grave
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.)
Arndt Schafer Chemie & Umwelt GmbH
Original Assignee
Arndt Schafer Chemie & Umwelt 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7905810&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2000065110(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Arndt Schafer Chemie & Umwelt GmbH filed Critical Arndt Schafer Chemie & Umwelt GmbH
Priority to AU42944/00A priority Critical patent/AU4294400A/en
Publication of WO2000065110A1 publication Critical patent/WO2000065110A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents

Definitions

  • the invention relates to a method for removing contaminants
  • the method relates in particular to the removal of impurities such as gases, oxides and trace elements from aluminum melts, magnesium melts
  • melts It is also known from aluminum and magnesium melts to absorb gases, in particular hydrogen, during melting. During the solidification process, these gases are split off again and cannot escape due to the rapid solidification on the surface. They then form pores in the solid metal, which lead to a change in strength and to undesirable errors in corresponding finished products.
  • gases in particular hydrogen
  • hexachloroethane is used together with oxidizing agents such as nitrates, chlorates, salts of peroxymonosulfuric acid, persulfates, permanganates, chromates, perborates, inorganic peroxides, manganese dioxide or chromium trioxide.
  • oxidizing agents such as nitrates, chlorates, salts of peroxymonosulfuric acid, persulfates, permanganates, chromates, perborates, inorganic peroxides, manganese dioxide or chromium trioxide.
  • the disadvantage of this process is that the aluminum trichloride used is initially difficult to handle.
  • Aluminum trichloride is a highly hygroscopic reactive compound that shows intense smoking in the air and has a high vapor pressure.
  • aluminum chloride does not melt at normal pressure, but sublimates directly at about 190 ° C. This means that when an aluminum trichloride is added to the molten metal at temperatures between 700 and 800 ° C, a large part of the aluminum trichloride sublimates directly from the molten metal and the compound is therefore only slightly effective.
  • the process according to the document has the disadvantage that the molding first has to be produced by expensive melting of the aluminum trichloride in an autoclave.
  • the molding also contains pure aluminum trichloride, which is highly hygroscopic.
  • the shelf life of such shaped articles is therefore considerably restricted.
  • the addition of pure aluminum trichloride causes stormy reactions and very short reaction times in the melts. It will be very large gas bubbles are formed which are not very effective for cleaning the melt.
  • Such molded articles are less suitable, in particular, for use in large-scale melting furnaces, since they do not bring about sufficient cleaning.
  • the technical object of the invention was therefore to provide a process for cleaning melts of metals or alloys based on halogen-containing aluminum compounds, in which the melt is sufficiently cleaned and no complex processes are required to produce the moldings.
  • This technical problem is solved by a method for removing impurities from the melting of metals, a salt mixture being introduced into the melt of the metal or the alloy, which salt mixture is obtained by melting a halogen-containing anhydrous aluminum compound with non-aluminum-containing salts or salt mixtures, the Salt mixture melts below 190 ° C at normal pressure.
  • Such salt mixtures have the advantage that they are easy to manufacture.
  • To produce the salt mixtures the individual components, non-aluminum-containing salt or salt mixture and halogen-containing aluminum compound are mixed and melted in powder form. The melt obtained is cooled and cast or granulated into moldings.
  • These salt mixtures have the advantage that they do not sublime like pure aluminum trichloride at first, but melt at normal pressure. Furthermore, they are not as hygroscopic as anhydrous aluminum trichloride and, when added to the metal melts, do not lead to such stormy reactions as are observed when aluminum trichloride is added. Another advantage is the reduced hygroscopicity of the salt mixtures. Eutectic or low-melting salt mixtures which have a melting point below 190 ° C. are preferably used as salt mixtures.
  • salt mixtures are produced in a closed system, for example in a stainless steel melting furnace with a lockable opening. casting and feed trough as well as a quenching unit including granulating device.
  • Aluminum trichloride and the associated amount of salts not containing aluminum are introduced into the melting furnace, the lid is closed and the mixture is heated to 90-155 ° C. with stirring.
  • the individual salts are melted together.
  • the liquid melt is then fed into a quenching unit or the granulating device via a closed channel. After the melt has cooled completely, it can be removed as a cake or granulate and is then packaged or further processed.
  • aluminum trichloride and / or AlOCI is used as the halogen-containing aluminum compound.
  • Chlorides or nitrates are used as non-aluminum-containing salts.
  • salt mixtures selected from the group AlCIs / KCI, AlCIs / NaCI, AlCIs / NaCI / KCI, AlClj MgCIj, AlCIs / NaCI / MgCfe, AlCb / KC ⁇ / MgCfe, AICU / KCI / CuCI, AlCIs NaCI / is particularly preferred.
  • AICl3 AIOCI / KCI / MgCI 2 , AlCla / AlOCI KCI / CuCI, AlCla / AlOCI / NaCI / CuCI.
  • salt mixtures can be added to the salt mixtures.
  • buffering components the function of which is to intercept the hydrogen chloride compounds formed in the reaction of the aluminum trichloride.
  • carbonates and / or oxides of metals of the 1st to 3rd main group of the periodic table are preferably used.
  • Particularly preferred substances are selected from the group Na 2 CO 3, K 2 C0 3, MgO, CaO, Al 2 O 3.
  • control components are added as control components for extending the reaction time and for controlling the release of active ingredient to the molten metal.
  • These are fluorides, sulfates or nitrates of alkali or alkaline earth metals or mixtures thereof.
  • double fluorides such as Na 3 AIF 6 and / or K ⁇ AIFe, is particularly preferred.
  • Alkali or alkaline earth metal chlorides or other compounds which are inert in the molten metal serve as carriers for the moldings produced from the eutectic salt mixtures.
  • these further components are preferably added to the liquid salt melt. It is also possible to mix the solidified and granulated salt melt with the other components and to compress it into a compact. The compacts or the solidified salt melt can then be used as a molding.
  • the moldings produced are usually used in a diving bell and thus introduced into the aluminum melt. Immersion in the melt is hereby achieved. Without the diving bell, the moldings would otherwise float on the melt and would not be able to take full effect.
  • metals which increase the specific weight and thus enable immersion in the melt.
  • metals selected from the group iron, Nikkei, manganese or copper are preferably used.
  • the moldings are further preferred to provide with a metallic covering or to fill them in a metallic container. This protects the molding from moisture.
  • metals are used from which the molten metal is made, so that when the metal is added, the metal melts first and the molding then dissolves in the molten metal.
  • the salt mixture preferably contains 60-90% by weight, particularly preferably 65-85% by weight of a halogen-containing aluminum compound such as AICI 3 and / or AIOCI and 10-40% by weight, particularly preferably 25-35% by weight, of non-aluminum-containing compounds Salts.
  • a halogen-containing aluminum compound such as AICI 3 and / or AIOCI and 10-40% by weight, particularly preferably 25-35% by weight, of non-aluminum-containing compounds Salts.
  • the salt mixture is added in amounts of 0.01-0.2% by weight to the melt of the metal or alloy.
  • the typical composition of a molding can for example: 5-15% by weight salt mixture, 10-30% by weight control component, 10-30% by weight buffering component, 40-60% by weight carriers.
  • the buffering components such as oxides or carbonates can be added to the mixture directly in the melt or the solidified granulated salt melt can be mixed with powder of these buffering components and pressed.
  • the inclusion of aluminum trichloride in a chemical compound also has an advantageous influence on the control of the reaction and the dissolution behavior of the active ingredient. This results in a better distribution of the active ingredient in the molten metal and also a delayed reaction of the released aluminum trichloride.
  • the control components used ensure, on the one hand, that there is sufficient reaction time and, on the other hand, 5 bubbles which are as small as possible are formed within the molten metal and can develop a better efficiency.
  • reaction time 2-4 minutes for treatment in large-scale furnaces and 1-2 minutes in deep ovens at the usual melting temperatures between 700 and 800 ° C. has proven to be favorable for the preparation to be in intensive contact bring with the amount of melt and let the reaction run as completely as possible within the melt.
  • a reaction time ⁇ 2 minutes is sufficient in crucibles with 400 - 800 kg melt.
  • the aluminum compound is released evenly, so that an effective aluminum compound is also available in sufficient quantity at the end of the reaction time.
  • many small gas bubbles are created, which make high use of the active component
  • a further variant comprises the salt mixture, which is present as a block, blank or concentrate, to be pressed into a tablet from control or carrier components.
  • 16 kg of aluminum trichloride and 4 kg of a mixture of sodium and potassium chloride are introduced into a melting furnace made of stainless steel with a stirrer with a closable spout, feed channel, quenching unit including granulating device.
  • the powdery mixture is mixed and the melting furnace is heated to 120 ° C.
  • the individual components are melted while stirring.
  • the melt is fed into the cooling unit or into a granulating device via a closed channel.
  • These granules are provided with buffering components, control components and carriers and pressed into a tablet-shaped molding.
  • this tablet-shaped molding is used and the gas contents of a molten metal before and after the molding is added determined.
  • the gas content of the melt was determined as a density index mbar at 80 and determined by means of Aluschmelztester in cm3 / 100 g melt.
  • composition of the tablet is a composition of the tablet:
  • melt granules consisting of 69.6% AICI 3 and 39.4% NaCI 20.0% by weight double fluorides 20.0% by weight alkali and alkaline earth metal nitrates and sulfates 50.0% by weight -% alkali and alkaline earth chlorides
  • composition of the tablet is a composition of the tablet:
  • melt granules consisting of 76.1% AICI 3 and 13.8% NaCl and 10.1% KCI 17.5% by weight double fluorides, 20.0% by weight alkali metal and alkaline earth metal nitrates and sulfates 50.0% by weight of alkali and alkaline earth chlorides
  • composition of the tablets is a composition of the tablets:
  • melt granules consisting of 79.0% AICI 3 and 21.0% KCI 17.5% by weight double fluoride 20 20.0% by weight alkali and alkaline earth metal nitrates and sulfates 50.0% by weight .-% alkali and alkaline earth chlorides
  • composition of the tablets is a composition of the tablets:
  • melt granules consisting of 79.0% AICI 3 and 21.0% NaCl 17.5% by weight double fluorides 20.0% by weight alkali and alkaline earth metal nitrates and sulfates 15 50.0% by weight .-% alkali and alkaline earth chlorides
  • composition of the tablets is a composition of the tablets:
  • melt granules consisting of 79.0% AICI3 and 21.0% NaCl 17.5% by weight double fluorides 20.0% by weight alkali and alkaline earth metal nitrates and sulfates 30 50.0% by weight. -% alkali and alkaline earth chlorides Result: output value gas content of 0.22 cm 3/100 g 0.23 cm 3/100 g after treatment 1 0.12 cm 3/100 g 0.12 cm 3 / 100g after treatment 0 2, 10 cm 3/100 g 0.09 cm3 / 100 g

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  • 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

L'invention a pour objet un procédé d'élimination d'impuretés contenues dans des masses fondues de métaux ou d'alliages, en particulier d'aluminium et de magnésium, caractérisé en ce qu'on introduit dans la masse fondue du métal ou de l'alliage, un mélange de sels qui est obtenu par fusion d'un composé d'aluminium halogéné anhydre avec des sels ou des mélanges de sels ne renfermant pas d'aluminium, le mélange de sels fondant à une température inférieure à 190 DEG C, sous pression normale. De préférence, le mélange de sels est ajouté à la masse fondue sous forme d'agglomérés comprimés ou de granulats de sels fondus solidifiés.
PCT/EP2000/003122 1999-04-24 2000-04-07 Elimination d'impuretes dans des masses fondues de metaux ou d'alliages au moyen de melanges de sels a faible point de fusion renfermant du trichlorure d'aluminium Ceased WO2000065110A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU42944/00A AU4294400A (en) 1999-04-24 2000-04-07 Removal of impurities from molten masses of metals or alloys using low melting point aluminum trichloride containing salt mixtures

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19918766.5 1999-04-24
DE1999118766 DE19918766C2 (de) 1999-04-24 1999-04-24 Verfahren zur Entfernung von Verunreinigungen aus Schmelzen von Metallen oder Legierungen

Publications (1)

Publication Number Publication Date
WO2000065110A1 true WO2000065110A1 (fr) 2000-11-02

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ID=7905810

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PCT/EP2000/003122 Ceased WO2000065110A1 (fr) 1999-04-24 2000-04-07 Elimination d'impuretes dans des masses fondues de metaux ou d'alliages au moyen de melanges de sels a faible point de fusion renfermant du trichlorure d'aluminium

Country Status (4)

Country Link
AU (1) AU4294400A (fr)
CZ (1) CZ20014114A3 (fr)
DE (1) DE19918766C2 (fr)
WO (1) WO2000065110A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1939311A3 (fr) * 2006-12-29 2009-03-25 Hoesch Metallurgie GmbH Fondant de bain de métal, son utilisation ainsi que procédé de traitement d'un bain de métal et procédé de fabrication d'un fondant de bain de métal

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10235909A1 (de) * 2002-08-06 2004-02-26 Peak-Werkstoff Gmbh Verfahren zum Binden von Wasserstoff in Leichtmetallwerkstoffen
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
CN104278168A (zh) * 2014-10-31 2015-01-14 湖州织里天荣铝材添加剂厂 一种铝合金无钠精炼剂及其制备工艺

Citations (7)

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Publication number Priority date Publication date Assignee Title
DE885933C (de) * 1943-06-08 1953-08-10 Vaw Ver Aluminium Werke Ag Verfahren zur Entfernung der Metalle der zweiten Gruppe des periodischen Systems aus solche Metalle enthaltenden Aluminiumlegierungen
GB1309266A (en) * 1969-03-21 1973-03-07 Alloys & Chem Corp Purification of molten aluminium
FR2393071A1 (fr) * 1977-06-02 1978-12-29 Thiem Corp Flux ameliore pour la recuperation de l'aluminium dans des scories d'aluminium dans un procede de seconde fusion
SU665007A1 (ru) * 1977-02-22 1979-05-30 Институт Металлургии И Обогащения Ан Казахской Сср Флюс дл рафинировани магни
EP0248994A1 (fr) * 1986-05-21 1987-12-16 Dr. Riedelbauch & Stoffregen GmbH Procédé de dégazage et d'affinage de bains de métaux légers
DE4310054A1 (de) * 1993-03-27 1994-09-29 Guenther Prof Dipl Chem Kraft Verfahren und Mittel zur Behandlung von Aluminium- und Aluminiumlegierungsschmelzen
RU2086689C1 (ru) * 1993-04-13 1997-08-10 Акционерное общество "АвтоВАЗ" Способ обработки жидких алюминиевых сплавов

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FR2325727A1 (fr) * 1975-09-26 1977-04-22 Servimetal Flux pour l'elimination des metaux alcalins et alcalino-terreux de l'aluminium et de ses alliages et procedes de mise en oeuvre

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE885933C (de) * 1943-06-08 1953-08-10 Vaw Ver Aluminium Werke Ag Verfahren zur Entfernung der Metalle der zweiten Gruppe des periodischen Systems aus solche Metalle enthaltenden Aluminiumlegierungen
GB1309266A (en) * 1969-03-21 1973-03-07 Alloys & Chem Corp Purification of molten aluminium
SU665007A1 (ru) * 1977-02-22 1979-05-30 Институт Металлургии И Обогащения Ан Казахской Сср Флюс дл рафинировани магни
FR2393071A1 (fr) * 1977-06-02 1978-12-29 Thiem Corp Flux ameliore pour la recuperation de l'aluminium dans des scories d'aluminium dans un procede de seconde fusion
EP0248994A1 (fr) * 1986-05-21 1987-12-16 Dr. Riedelbauch & Stoffregen GmbH Procédé de dégazage et d'affinage de bains de métaux légers
DE4310054A1 (de) * 1993-03-27 1994-09-29 Guenther Prof Dipl Chem Kraft Verfahren und Mittel zur Behandlung von Aluminium- und Aluminiumlegierungsschmelzen
RU2086689C1 (ru) * 1993-04-13 1997-08-10 Акционерное общество "АвтоВАЗ" Способ обработки жидких алюминиевых сплавов

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DATABASE WPI Section Ch Week 198007, Derwent World Patents Index; Class M25, AN 1980-12271C, XP002144801 *
DATABASE WPI Section Ch Week 199641, Derwent World Patents Index; Class M26, AN 1996-411360, XP002144800 *
DATABASE WPI Section Ch Week 199814, Derwent World Patents Index; Class M25, AN 1998-157999, XP002144799 *
ORBON H: "ENTGASUNGS- UND REINIGUNGSVERFAHREN FUR ALUMINIUMSCHMELZEN", GIESSEREI,DE,GIESSEREI VERLAG. DUSSELDORF, vol. 77, no. 3, 5 February 1990 (1990-02-05), pages 95 - 97, XP000104087, ISSN: 0016-9765 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1939311A3 (fr) * 2006-12-29 2009-03-25 Hoesch Metallurgie GmbH Fondant de bain de métal, son utilisation ainsi que procédé de traitement d'un bain de métal et procédé de fabrication d'un fondant de bain de métal

Also Published As

Publication number Publication date
AU4294400A (en) 2000-11-10
CZ20014114A3 (cs) 2003-02-12
DE19918766C2 (de) 2001-05-10
DE19918766A1 (de) 2000-11-02

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