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WO2000067942A1 - Procede de recuperation - Google Patents

Procede de recuperation Download PDF

Info

Publication number
WO2000067942A1
WO2000067942A1 PCT/GB2000/001762 GB0001762W WO0067942A1 WO 2000067942 A1 WO2000067942 A1 WO 2000067942A1 GB 0001762 W GB0001762 W GB 0001762W WO 0067942 A1 WO0067942 A1 WO 0067942A1
Authority
WO
WIPO (PCT)
Prior art keywords
clad layer
core
brazing sheet
alloy
liquid
Prior art date
Application number
PCT/GB2000/001762
Other languages
English (en)
Inventor
John Richard Mills
David Charles William Humphreys
Ian Bousfield
Original Assignee
Alcan International Limited
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 Alcan International Limited filed Critical Alcan International Limited
Priority to CA002368084A priority Critical patent/CA2368084A1/fr
Priority to KR1020017014266A priority patent/KR20020013540A/ko
Priority to EP00929680A priority patent/EP1194259A1/fr
Publication of WO2000067942A1 publication Critical patent/WO2000067942A1/fr

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
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • 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
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/18—Extraction of metal compounds from ores or concentrates by wet processes with the aid of microorganisms or enzymes, e.g. bacteria or algae
    • 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

  • This invention relates to a new way of separating the cladding layer from the core of brazing sheet. More particularly, it relates to a process which enables the economic and efficient recovery for recycling purposes of the core alloy and/or the cladding alloy from brazing sheet scrap. Such scrap inevitably arises during the hot rolling process by which brazing sheet is produced.
  • Brazing sheet is a specialised product used in the construction of heat exchangers - for example, car radiators. It is made up of a core sheet of aluminium alloy, containing for example between about 1 .0 and 2.5% of alloying elements, that is clad on either one or both sides with a layer of an aluminium alloy of lower melting point.
  • the core provides the required strength.
  • the outer layer having a lower melting point, provides the metal for brazing (i.e. the process of joining together two pieces of metal, such as the tube and the fins of a radiator, by fusing a layer of a metal between the adjoining surfaces).
  • the core layer is an Al-Mn alloy, typically an AA3000 series alloy such as AA3003, or an alloy of the type disclosed in EP-A-691898 (such as X900 type) or EP-A- 326337 (such as X800 type) and the cladding is aluminium alloy containing 7-12% Si, for example AA4343 or AA4045 for flux brazing and AA4104 for vacuum brazing.
  • Each layer of cladding accounts for about 5-15%, typically
  • the final thickness of the sheet can be around 0.5 mm or less.
  • the difference in melting point between the cladding and the core is usually about 60°C.
  • the clad layer is applied by hot rolling an ingot of the core material faced on one or both of the major sides with a plate of the cladding alloy.
  • the rolling deformation bonds the layers very firmly together. They cannot readily be pulled apart.
  • some material is inevitably scrapped. This scrap has little value since it can be recycled into few other wrought aluminium alloys. Normally it is sold off either to go into low value applications, such as foundry alloys, or for killing steel.
  • JP-A-10219364 makes use of induction heating to preferentially melt the clad layer.
  • JP-A-8013049 describes a technique whereby the scrap is heated until the clad layer is "fused" and flows down to a lower edge of the scrap where it is collected as a fillet or bead. Presumably, this bead is then sheared off after cooling. The resulting scrap core is expected to retain a film of cladding held in place by surface tension. The bead of cladding will be contaminated with residual core metal.
  • US 4,203,762 describes a process for processing aluminium clad ferrous substrates to separately recover the aluminium and ferrous components in re-usable form.
  • the clad steel sheet is hung vertically and heated to such high temperature that the aluminium melts and drips off.
  • the process may include a step which involves the jarring or vibration of the clad sheet and this is said to facilitate dislodgement and gravitational drainage of the molten aluminium from its surface.
  • the process is not suitable for separating the cladding layer from the core of brazing sheet.
  • core alloys such as X900 type and X800 type mentioned above
  • the use of higher strength core alloys results in the cladding being smeared out more during the rolling process. This leads to the formation of a trailing length of cladding hanging over the back of the hot rolled bands. Immediately ahead of that, the cladding is too thin. There is therefore more scrap being cut off and, in consequence, more scrap that it would be desirable to recycle.
  • core alloys such as X900 type and X800 type are made from smelter metal to give the required corrosion resistance. Only if the purity of this metal can be preserved by the recovery process, is it possible to recycle such scrap into new core material. Previously, the scrap could be incorporated into core material made from remelt metal. The present invention seeks to meet that need.
  • a process for separating the clad layer from the core of brazing sheet which comprises heating the sheet until the clad layer becomes liquid or semi- liquid but the core remains solid, removing the clad layer in its liquid or semi-liquid state and then recovering the same, and wherein the said clad layer is removed by mechanical means which apply a shear force directly to the clad layer.
  • the invention also provides core alloy and/or cladding alloy which has been recovered from brazing sheet scrap by the aforesaid process, and products made from the said core alloy and/or cladding alloy. The whole process can be carried out in a reverbatory furnace.
  • the brazing sheet is supported, preferably in a substantially horizontal position, in the furnace which is then heated to a temperature between the solidus of the cladding and the solidus of the core.
  • the solidus of the cladding will be about 577°C (for AA4045 and AA4343) and the solidus of the core is from 643-654°C (for AA3003).
  • the temperature is held as low as possible to retain the maximum strength in the core but sufficiently high to render the cladding at least partially fluid.
  • the clad layer can then be mechanically removed while it is in this liquid or semi-liquid state and recovered. When sufficient of the cladding has been removed, the core material can be recovered.
  • the removal of the liquid or semi-liquid clad layer from the brazing sheet is performed by mechanical means which apply a shear force directly to the clad layer.
  • the mechanical means may comprise a hand held or automatically operated scraper.
  • the cladding is scraped off the surface of the core material and then recovered.
  • the mechanical removal may be achieved by the use of gas jets or high pressure flames.
  • the removal of the clad layer is thus effected by a mechanically applied shear force in the plane of the brazing sheet. It is considered surprising that the clad layer can be successfully removed and recovered in this way. The operation is being carried out at a temperature approaching 600°C on a substrate that is close to its melting point and which is very frail. Specifically, it is most surprising that such a frail substrate can be scraped sufficiently hard to effectively remove the liquid or semi-liquid layer. It is even more surprising that the cladding can thereby be removed to such an extent that the core material can be reused (recycled) for alloys such as X900 type and X800 type requiring low silicon contents.
  • the process enables both the clad layer and the core material to be recovered or reclaimed from brazing sheet scrap and they can then be reused or recycled. It is considered to be particularly surprising that the layer of cladding can be effectively recovered in this way since it was to be expected that this material would have become heavily oxidised by the heating in the furnace. Most surprisingly, the recovered cladding is clean enough (not only from the comparative lack of oxidation, but also sufficiently uncontaminated by the core material) to allow it to be used either in cladding alloys or as a source of high silicon alloy for other applications. The ability for the first time to reuse or recycle both of these components of brazing sheet scrap, by means of a process that is both simple to operate and efficient, is most significant.
  • the process of this invention thus satisfies a long felt want in this branch of the aluminium industry and is expected to produce substantial cost savings.
  • the process works only with the thicker scrap when the clad layer is thicker than about 0.3 mm. In laboratory tests on sheet about 3 mm thick, it has been found that the clad layer could not be removed. Very thin liquid layers seem to be held in place by surface tension forces that are difficult to overcome. Plate about 50-75 mm thick can be treated by the process and this accounts for about 33% of all process scrap.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Geology (AREA)
  • Manufacturing & Machinery (AREA)
  • Biotechnology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Microbiology (AREA)
  • Biochemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

L'invention concerne un procédé permettant de séparer la couche de revêtement par rapport au coeur d'une feuille de brasage: on chauffe la feuille jusqu'à liquéfier ou semi-liquéfier la couche de revêtement tandis que le coeur reste à l'état solide, puis on retire la couche à l'état liquide ou semi-liquide afin de la récupérer. On utilise à cet effet des moyens mécaniques par application d'une force de cisaillement directement sur la couche. Ce procédé permet une récupération économique et efficace, aux fins de recyclage, de l'alliage du coeur et/ou de l'alliage de revêtement sur des rebuts de feuille de brasage.
PCT/GB2000/001762 1999-05-10 2000-05-09 Procede de recuperation WO2000067942A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA002368084A CA2368084A1 (fr) 1999-05-10 2000-05-09 Procede de recuperation
KR1020017014266A KR20020013540A (ko) 1999-05-10 2000-05-09 회수법
EP00929680A EP1194259A1 (fr) 1999-05-10 2000-05-09 Procede de recuperation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9910813A GB2349891B (en) 1999-05-10 1999-05-10 Recovery method
GB9910813.6 1999-05-10

Publications (1)

Publication Number Publication Date
WO2000067942A1 true WO2000067942A1 (fr) 2000-11-16

Family

ID=10853169

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2000/001762 WO2000067942A1 (fr) 1999-05-10 2000-05-09 Procede de recuperation

Country Status (5)

Country Link
EP (1) EP1194259A1 (fr)
KR (1) KR20020013540A (fr)
CA (1) CA2368084A1 (fr)
GB (1) GB2349891B (fr)
WO (1) WO2000067942A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002101102A1 (fr) * 2001-04-24 2002-12-19 Corus Aluminium Voerde Gmbh Procede de recyclage de pieces de dechets a revetement metallique
FR2855774A1 (fr) * 2003-06-05 2004-12-10 Pechiney Rhenalu Procede de separation des couches de chutes de bandes plaquees par colaminage
CN113231746A (zh) * 2020-12-25 2021-08-10 浙江绅尚绅品节能科技有限公司 一种石材定位加工红外线切割机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2704249A (en) * 1952-04-10 1955-03-15 Gen Motors Corp Method for separating composite aluminum-iron articles
JPH05112833A (ja) * 1991-04-25 1993-05-07 Nippon Steel Corp 表面処理鋼板トリム屑の表層処理方法
JPH0813049A (ja) * 1994-06-29 1996-01-16 Nippon Light Metal Co Ltd ブレージングシートスクラップのろう材分離方法
JPH10219364A (ja) * 1997-02-12 1998-08-18 Sky Alum Co Ltd ブレージングシートスクラップの半溶融分離方法
WO1999032260A1 (fr) * 1997-12-19 1999-07-01 Corus Aluminium Walzprodukte Gmbh Procede permettant d'enlever une couche de revetement metallique de pieces de ferraille

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB427243A (en) * 1933-08-04 1935-04-17 American Metal Co Ltd Improvements in methods for sweating out fusible metals
US4086083A (en) * 1977-01-14 1978-04-25 The Glacier Metal Company Limited Recovering material
US4203762A (en) * 1978-12-11 1980-05-20 Federal-Mogul Corporation Process for separating and recovering aluminum and steel from bimetal scrap
JPH03257126A (ja) * 1990-03-07 1991-11-15 Kobe Steel Ltd 熱交換器用クラッド材スクラップから皮材、芯材を別々に取り出す溶解法
JPH0734150A (ja) * 1993-07-16 1995-02-03 Furukawa Electric Co Ltd:The ブレージングシートの分離回収方法
US5364443A (en) * 1993-12-01 1994-11-15 Alcan International Limited Process for combined decoating and melting of aluminum scrap contaminated with organics

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2704249A (en) * 1952-04-10 1955-03-15 Gen Motors Corp Method for separating composite aluminum-iron articles
JPH05112833A (ja) * 1991-04-25 1993-05-07 Nippon Steel Corp 表面処理鋼板トリム屑の表層処理方法
JPH0813049A (ja) * 1994-06-29 1996-01-16 Nippon Light Metal Co Ltd ブレージングシートスクラップのろう材分離方法
JPH10219364A (ja) * 1997-02-12 1998-08-18 Sky Alum Co Ltd ブレージングシートスクラップの半溶融分離方法
WO1999032260A1 (fr) * 1997-12-19 1999-07-01 Corus Aluminium Walzprodukte Gmbh Procede permettant d'enlever une couche de revetement metallique de pieces de ferraille

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 468 (C - 1102) 26 August 1993 (1993-08-26) *
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 05 31 May 1996 (1996-05-31) *
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 13 30 November 1998 (1998-11-30) *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002101102A1 (fr) * 2001-04-24 2002-12-19 Corus Aluminium Voerde Gmbh Procede de recyclage de pieces de dechets a revetement metallique
US7217312B2 (en) 2001-04-24 2007-05-15 Corus Aluminium Voerde Gmbh Method of recycling metallic coated scrap pieces
CN100457930C (zh) * 2001-04-24 2009-02-04 克里斯铝业费尔德有限公司 回收金属包覆废料的方法
FR2855774A1 (fr) * 2003-06-05 2004-12-10 Pechiney Rhenalu Procede de separation des couches de chutes de bandes plaquees par colaminage
WO2005002750A1 (fr) * 2003-06-05 2005-01-13 Pechiney Rhenalu Procede de sepration des couches de chutes de bandes plaquees par colaminage.
US8210421B2 (en) 2003-06-05 2012-07-03 Constellium France Method for separating cropped layers from plated strips by roll bonding
CN113231746A (zh) * 2020-12-25 2021-08-10 浙江绅尚绅品节能科技有限公司 一种石材定位加工红外线切割机
CN113231746B (zh) * 2020-12-25 2023-01-20 浙江绅尚绅品节能科技有限公司 一种石材定位加工红外线切割机

Also Published As

Publication number Publication date
GB2349891A (en) 2000-11-15
EP1194259A1 (fr) 2002-04-10
GB2349891B (en) 2001-06-06
KR20020013540A (ko) 2002-02-20
CA2368084A1 (fr) 2000-11-16
GB9910813D0 (en) 1999-07-07

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