US20040261572A1 - Method for the purification of an aluminium alloy - Google Patents

Method for the purification of an aluminium alloy Download PDF

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Publication number
US20040261572A1
US20040261572A1 US10/488,042 US48804204A US2004261572A1 US 20040261572 A1 US20040261572 A1 US 20040261572A1 US 48804204 A US48804204 A US 48804204A US 2004261572 A1 US2004261572 A1 US 2004261572A1
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US
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Prior art keywords
stream
aluminium alloy
alloying element
content
downgrade
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Abandoned
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US10/488,042
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English (en)
Inventor
Paul De Vries
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Aleris Switzerland GmbH
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Corus Technology BV
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Assigned to CORUS TECHNOLOGY BV reassignment CORUS TECHNOLOGY BV ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DE VRIES, PAUL ALEXANDER
Publication of US20040261572A1 publication Critical patent/US20040261572A1/en
Assigned to ALERIS SWITZERLAND GMBH C/O K+P TREUHANGESELLSCHAFT reassignment ALERIS SWITZERLAND GMBH C/O K+P TREUHANGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CORUS TECHNOLOGY BV
Abandoned legal-status Critical Current

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    • 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
    • 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
    • C22B21/0084—Obtaining aluminium melting and handling molten aluminium
    • C22B21/0092—Remelting scrap, skimmings or any secondary source aluminium
    • 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
    • C22B9/02—Refining by liquating, filtering, centrifuging, distilling, or supersonic wave action including acoustic waves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to a method for the purification of an aluminium alloy.
  • a known method is fractional crystallisation, which can be applied to purify e.g. an aluminium alloy contaminated with an alloying element such as iron.
  • fractional crystallisation an input stream of an aluminium alloy scrap material, which, for a certain alloying element or contaminant, is hypoeutectic in composition, is split into a first output stream or product stream of purified aluminium and a second output stream or downgrade stream, which is more contaminated with the contaminant than the input stream and has a composition closer to the eutectic composition for the contaminant.
  • fractional crystallisation this is to be understood as comprising all forms of fractional crystallisation and all other purification methods starting from a hypoeutectic alloy, whereby the composition of the downgrade stream is determined by the eutectic composition of aluminium and an alloying element.
  • a problem of fractional crystallisation is that the maximum content of contaminant in the downgrade stream is determined by the eutectic composition.
  • the downgrade stream, having an increased Fe content is more than 25% of the input stream.
  • the material of the product stream has a higher economic value than the material of the original aluminium alloy, whereas the material of the downgrade stream has a lower economic value.
  • the loss in value of the higher contaminated downgrade stream, as compared to the value of the original aluminium alloy is not compensated by the increase of the economic value of the product stream.
  • the demand in the market for the material of the downgrade stream from the fractional crystallisation process is fairly low, so if it would be produced in large amounts, the economic value thereof will drop fast. Therefore, the process of fractional crystallisation, or in fact any other separation process wherein the input waste stream results in a more purified and a more contaminated stream of eutectic or near eutectic composition is to date economically not feasible.
  • An object of the invention is to provide a method for the purification of an aluminium alloy that is economically more feasible.
  • This and other objects are achieved with a method for the purification of an aluminium alloy containing an alloying element or contaminant wherein the aluminium alloy is subjected to a fractional crystallisation process wherein at least the aluminium alloy is separated into a product stream having a content of the alloying element less than the content of the alloying element in the aluminium alloy and a downgrade stream having a content of the alloying element higher than the content of the alloying element in the aluminium alloy and wherein the downgrade stream is subjected to a process of separation of intermetallics wherein an additive is added to the downgrade stream to form a mixture containing aluminium-alloying element-additive intermetallics and from this mixture a waste stream and a recycle stream is separated which waste stream contains a higher content of the alloying element than the recycle stream and the recycle stream is at least partly fed into the fractional crystallisation process.
  • the method according to the invention combines a hypoeutectic process, like fractional crystallisation (FC), with a hypereutectic process, like separation of intermetallics (SIM).
  • the waste stream comprises solid Al-alloying element-additive intermetallics
  • the recycle stream is basically a liquid aluminium stream containing less of the alloying element than the downgrade component.
  • a frequently occurring alloying element is Fe.
  • SIM processes are known in the art of metallurgy and comprises such processes as layer crystallisation, filtration, magnetic separation, hydro cyclonage and precipitation in molten salts.
  • the downgrade stream of the FC process is used as an input stream for the SIM process.
  • an additive is added.
  • the additive is selected such that it effectively lowers the eutectic composition of the alloying element and aluminium such as the eutectic composition of Fe and aluminium.
  • the downgrade stream of the fractional crystallisation process is made into a hypereutectic mixture by adding the additive thereto.
  • the mixture is split into a waste stream with a high content of the additive and the alloying element and a recycle stream with a lower composition of the alloying element. This recycle stream is mixed with the input stream of the aluminium alloy.
  • the method of the invention opens a new, much more economic, way to the purification of aluminium alloys, in particular suitable for aluminium alloys of a composition typical in the field of scrap recycling.
  • the method of the invention uses the separation of intermetallics process to purify the downgrade of the PC process and the PC process to purify at least part of the product stream (recycle stream) of the SIM process.
  • the fundamental impossibility to cross the eutectic for the FC process and the SIM process separately is circumvented by introducing a recycle loop in the process of the invention.
  • The, nearer to the eutectic, downgrade stream of the FC process is made hypereutectic by adding the additive.
  • The, nearer to the eutectic, product stream (recycle stream) of the SIM process is made hypoeutectic by diluting the additive through addition of aluminium alloy material to be purified.
  • the result of the process is at least partial removal of the alloying element from the aluminium alloy with a small resulting waste stream with a content of the alloying element above eutectic.
  • the method of the invention is therefore also referred to as cross-eutectic purification or XEP.
  • the process of the invention only produces a small waste stream. Therefore, it does not suffer from the problems described above that the waste stream of each of the separate processes, SIM process and FC process, is large compared to the demand in the market. Hence, large-scale application of the process of the invention only to a small extent influences the value of the waste stream and the profitability of the total process.
  • the mass balance of the process of the invention may limit the proportion of the product stream from the SIM process that can be fed back into the fractional crystallization process as recyle. Part of the liquid product stream then remains with the intermetallics formed. Preferably, at least part of the liquid aluminium is separated from the intermetallics in a subsequent separation process.
  • a preferred embodiment is characterised in that the additive comprises at least one element chosen from Si, Mn, Cu, Co and Ni. These elements as additive, added either individually or in combination, easily form intermetallics with many alloying elements used in the aluminium industry and yield a high removal efficiency. This applies in particular but not restricted thereto when the alloying element to be removed is Fe.
  • a further embodiment is characterised in that the additive comprises mainly Mn.
  • the additive comprises mainly Mn.
  • the invention is of particular interest in the event the alloying element is Fe.
  • the Fe content in the aluminium alloy is less than 1.7 weight %, more preferably less than 1.5 weight %.
  • the possible increase of Fe content in the downgrade stream of the FC process compared to the Fe content in the input stream is too low to make the overall process economically feasible.
  • the Fe content in the aluminium alloy is more than 0.4 weight %, more preferably more than 0.5% Fe.
  • Table 3 shows the result when our invention is applied to the scrap by adding an additive like manganese to the downgrade stream of the FC process and feeding back at least part of the product stream from the SIM process as recycle to the input of the FC process.
  • the table shows that the waste is reduced to less than 17% of the input scrap mass. It is assumed that at least the intermetallic Al 6 [Fe, Mn] is formed.
  • the waste according to Table 3, is about 17% of the input mass.
  • the amount of recycle that can be fed back into the FC process is determined by mass balance consideration and in many cases does not comprise the total amount of product from the SIM-process.
  • the amount of waste can be further reduced by further separating in a separate process aluminium, preferably in liquid form, from the intermetallics.
  • FIG. 1 shows the principle of the invention
  • FIG. 2 shows in a diagrammatic representation of an embodiment of the invention.
  • FIG. 1 the basic processes of the method of the invention are enclosed by square 20 .
  • the processes comprise a FC process, indicated by numeral 21 , and a SIM process, indicated by numeral 22 .
  • Scrap to be cleaned indicated by numeral 23 is fed through a line 24 into the FC process 21 .
  • the obtained purified product is indicated by numeral 25 and is removed from the FC process through line 26 .
  • the downgrade 27 is exported from the FC process through line 28 and fed into the SIM process 22 through line 29 .
  • a waste component 30 from the SIM process is taken from the SIM process through line 31 .
  • Additive 32 is fed into the SIM process through line 33 .
  • the recycle component 34 is taken from SIM process 22 through line 35 and fed into the FC process through line 36 .
  • reference number 11 indicates a supply line through which a stream of an aluminium alloy, as scrap, preferably in molten form, containing an alloying element is fed to a first process vessel 12 in which the fractional crystallisation process is performed.
  • This fractional crystallisation process may be chosen to be a known embodiment of fractional crystallisation.
  • Connected to supply line 11 is a return line 13 the function of which will be described later.
  • the supply line 11 and return line 13 merge into an input line 19 , which is coupled to process vessel 12 .
  • the fractional crystallisation process the mixture of aluminium alloy and downgrade stream is separated into a product component, which is removed through product line 14 , and a residual component that is extracted from process vessel 12 through waste line 15 .
  • the waste stream is fed through line 18 into a subsequent separation process 10 in which aluminium, in liquid or solid form, is separated from intermetallics.
  • a subsequent separation process 10 in which aluminium, in liquid or solid form, is separated from intermetallics.
  • the total combined process has as input-streams the stream of aluminium alloy to be cleaned, and the stream of additive and as output-stream the waste stream and the product component.

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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)
  • Acoustics & Sound (AREA)
  • Physics & Mathematics (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Removal Of Specific Substances (AREA)
  • Polyesters Or Polycarbonates (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • ing And Chemical Polishing (AREA)
  • Processing Of Solid Wastes (AREA)
US10/488,042 2001-09-03 2002-08-30 Method for the purification of an aluminium alloy Abandoned US20040261572A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20010203312 EP1288319B1 (en) 2001-09-03 2001-09-03 Method for the purification of an aluminium alloy
PCT/EP2002/009817 WO2003020991A1 (en) 2001-09-03 2002-08-30 Method for the purification of an aluminium alloy

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US20040261572A1 true US20040261572A1 (en) 2004-12-30

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US (1) US20040261572A1 (enExample)
EP (1) EP1288319B1 (enExample)
JP (1) JP4159989B2 (enExample)
KR (1) KR20040029145A (enExample)
CN (1) CN1257293C (enExample)
AT (1) ATE270348T1 (enExample)
CA (1) CA2459252A1 (enExample)
DE (1) DE60104114T2 (enExample)
ES (1) ES2222309T3 (enExample)
NO (1) NO20041401L (enExample)
NZ (1) NZ531655A (enExample)
PL (1) PL197423B1 (enExample)
RU (1) RU2293128C2 (enExample)
UA (1) UA75725C2 (enExample)
WO (1) WO2003020991A1 (enExample)
ZA (1) ZA200401717B (enExample)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080000326A1 (en) * 2004-03-19 2008-01-03 Corus Technology Bv Method for the Purification of a Molten Metal
US7419530B2 (en) 2002-07-05 2008-09-02 Aleris Switzerland Gmbh C/O K+P Treuhangesellschaft Method for fractional crystallisation of a molten metal
US7442228B2 (en) 2001-10-03 2008-10-28 Aleris Switzerland Gmbh C/O K+P Treuhangesellschaft Method and device for controlling the proportion of crystals in a liquid-crystal mixture
US7537639B2 (en) 2003-11-19 2009-05-26 Aleris Switzerland Gmbh Method of cooling molten metal during fractional crystallisation
US20090285716A1 (en) * 2006-06-23 2009-11-19 Alcan Rhenalu Process for recycling aluminium alloy scrap coming from the aeronautical industry
US20090301259A1 (en) * 2006-06-22 2009-12-10 Aleris Switzerland Gmbh Method for the separation of molten aluminium and solid inclusions
US20090308203A1 (en) * 2006-07-07 2009-12-17 Aleris Switzerland Gmbh C/O K+P Treuhandgesellschaft Method and device for metal purification and separation of purified metal from metal mother liquid such as aluminium
US7648559B2 (en) 2002-07-05 2010-01-19 Aleris Switzerland Gmbh C/O K+P Treuhangesellschaft Method for fractional crystallisation of a metal
US20100024602A1 (en) * 2006-06-28 2010-02-04 Aleris Switzwerland Gmbh Crystallisation method for the purification of a molten metal, in particular recycled aluminium
WO2019035909A1 (en) * 2017-08-16 2019-02-21 Alcoa Usa Corp. PROCESSES FOR RECYCLING AND PURIFYING ALUMINUM ALLOYS

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NL1023009C2 (nl) * 2003-03-25 2004-09-30 Univ Delft Tech Werkwijze voor het winnen van een metaal uit een mengsel.
CN102586623B (zh) * 2012-03-16 2014-01-15 南南铝业股份有限公司 高纯铝的提取方法和设备
CN102732754B (zh) * 2012-06-07 2014-03-12 包头铝业有限公司 低含量铝基合金分离浓缩与提纯工艺及系统
CN105274357A (zh) * 2015-11-24 2016-01-27 重庆汇程铝业有限公司 一种铝合金精炼装置
JP6667485B2 (ja) * 2017-10-20 2020-03-18 株式会社豊田中央研究所 Ａｌ合金の再生方法
CN115283593B (zh) * 2022-08-18 2024-06-25 重庆新钰立金属科技有限公司 一种发电机油箱框铝锻件的成型方法

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7442228B2 (en) 2001-10-03 2008-10-28 Aleris Switzerland Gmbh C/O K+P Treuhangesellschaft Method and device for controlling the proportion of crystals in a liquid-crystal mixture
US7648559B2 (en) 2002-07-05 2010-01-19 Aleris Switzerland Gmbh C/O K+P Treuhangesellschaft Method for fractional crystallisation of a metal
US7419530B2 (en) 2002-07-05 2008-09-02 Aleris Switzerland Gmbh C/O K+P Treuhangesellschaft Method for fractional crystallisation of a molten metal
US7537639B2 (en) 2003-11-19 2009-05-26 Aleris Switzerland Gmbh Method of cooling molten metal during fractional crystallisation
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ZA200401717B (en) 2005-03-02
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JP4159989B2 (ja) 2008-10-01
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PL367791A1 (en) 2005-03-07
NZ531655A (en) 2005-08-26
JP2005501968A (ja) 2005-01-20
DE60104114D1 (de) 2004-08-05
CN1257293C (zh) 2006-05-24
DE60104114T2 (de) 2005-08-18
EP1288319B1 (en) 2004-06-30
RU2004110030A (ru) 2005-06-10
ATE270348T1 (de) 2004-07-15
KR20040029145A (ko) 2004-04-03
RU2293128C2 (ru) 2007-02-10
ES2222309T3 (es) 2005-02-01

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