EP0965630A1 - Verfahren zur Abtrennung von Metallen aus Verbundwerkstoffkörpern - Google Patents

Verfahren zur Abtrennung von Metallen aus Verbundwerkstoffkörpern Download PDF

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Publication number
EP0965630A1
EP0965630A1 EP98500217A EP98500217A EP0965630A1 EP 0965630 A1 EP0965630 A1 EP 0965630A1 EP 98500217 A EP98500217 A EP 98500217A EP 98500217 A EP98500217 A EP 98500217A EP 0965630 A1 EP0965630 A1 EP 0965630A1
Authority
EP
European Patent Office
Prior art keywords
chamber
materials
metal
recovered
gases
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.)
Withdrawn
Application number
EP98500217A
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English (en)
French (fr)
Inventor
Francisco Hernàndez Aced
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.)
Enso Espanola SA
Original Assignee
Enso Espanola 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 Enso Espanola SA filed Critical Enso Espanola SA
Publication of EP0965630A1 publication Critical patent/EP0965630A1/de
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B1/00—Retorts
    • C10B1/10—Rotary retorts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B47/00—Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion
    • C10B47/28—Other processes
    • C10B47/30—Other processes in rotary ovens or retorts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form

Definitions

  • the present invention discloses a process for separating metals from composite laminated bodies, especially bodies of the laminar type that are used for the manufacture of containers of various types and that comprise a metal sheet combined with a sheet of plastics material, cellulose material, textile material or other types of covering.
  • Such composite laminated materials are widely used in many fields of industry in order to manufacture containers in which various products, such as foodstuffs, pharmaceuticals, etc., are marketed.
  • a major problem currently posed by that type of container is its recycling since, being of a kind made of a large number of materials based on a metal laminate and other covering material, at least on one of its faces, it is difficult to achieve correct recycling using materials of said laminates, and the result is the generation of large amounts of non-usable waste.
  • the present invention discloses a process and an apparatus permitting recycling of said type of material by separation of the metal by removing the remainder of the constituent material, such as a laminate of plastics material.
  • the process forming the subject-matter of the present invention is based on subjecting the laminar bodies of metal and, for example, plastics composite material to a controlled temperature which is higher than the vaporisation temperature of the plastics material covering the metal support but lower than the melting temperature of the metal.
  • the thermal treatment is effected with the exclusion of air or with an amount of air lower than that required for combustion of the gasified plastics, that is to say, lower than the flame propagation point in the gases from the plastics material.
  • the thermal treatment is carried out by displacing the composite materials along a heating chamber, producing a gradual pyrolysis effect until the metal support, which is recovered later as scrap metal, has been completely released.
  • the process is applied preferably to metal laminar waste having a layer of plastics, with the exception of PVC.
  • the maximum thickness of the layer of metal, especially aluminium, is some 40 microns.
  • the starting material is a laminate formed by a metal, for example, aluminium, and a layer of a cellulose material, for example, paper
  • the layer of paper will be burnt in the thermal treatment stage, giving rise to a small residue of ash.
  • the apparatus for carrying out the process forming the subject-matter of the present invention basically comprises a rotary combustion chamber to which the residues to be recovered from the composite materials of metal and a covering of a plastics or cellulose type are conveyed, the recovery elements being displaced continuously and at a reduced rate along the chamber, which is subjected to heating over its entire length by means of a surrounding jacket heated inside an oven-type chamber of refractory material by the combustion of gas or other fuels.
  • the displacement of the materials along the heating chamber is preferably effected by the gentle inclination and the rotation thereof, which enables them to be displaced by gravity.
  • the metal residues slightly puddled by the action of heat and mechanical action are moved along the chamber for heating to an elevated temperature, lower than the melting temperature, by means of a duct provided with a conveyor, and are then cooled and optionally used as scrap metal.
  • the chamber has an inlet at its end for the materials to be recovered which arrive from a system of two hoppers which operate in parallel and which are in communication with the inlet duct by means of corresponding valves.
  • An outlet tube for the gases generated, which can be used for their high energy content, is arranged coaxially, preferably at the same inlet end.
  • the treatment chamber is supported inside the surrounding heating chamber at various points along its outer surface, with the provision of roller bearings produced from materials resistant to relatively high temperatures.
  • the process provides for the production of a partial vacuum in the chamber at the beginning of the process in order to extract as much air, and therefore oxygen, as possible in order to avoid the risk of fire, above all at the beginning of the process.
  • an inert gas for example, nitrogen
  • An extractor is preferably provided at the gas outlet, which extractor increases the draught inside the chamber and combines with a reduced air intake at the outlet for the recovered metal elements in order thus to improve the scavenging of the thermal treatment chamber.
  • the apparatus forming the subject-matter of the present invention comprises a surrounding external chamber of refractory material 1 which accommodates a heating chamber 2 which receives the heating gases of the combustion in the interior 3 of the chamber 1, which combustion is produced by gas or another type of fuel, by way of an inlet and burners represented diagrammatically by the numeral 4.
  • the inside of the heating chamber 2 accommodates the rotary treatment chamber 5 operated by the end shaft 6 by means of a suitable drive system (not shown).
  • the unit composed of the rotary chamber 5 and the surrounding heating chamber 2 is arranged so that it slopes slightly from the inlet end or face 7 to the opposite end 8 of the chamber 1, permitting a slow displacement of the residues to be recovered, which have been introduced via the duct 9 and come from one or two hoppers 10 and 11 which operate in parallel and which are controlled by the respective valves 12 and 13.
  • An outlet duct 14 which opens out in the rotary combustion chamber 5 enables the gases recovered from the plastics material, which can be exploited for their calorific potential, to escape to the outside.
  • the metal residues at the end of the treatment in the chamber 5 are evacuated via the outlet duct 15 which is arranged with a given inclination in order to promote the discharge of the materials by gravity, although that duct likewise comprises an internal conveyor 16, which is preferably in the form of a helicoidal element.
  • a duct 17 arranged in parallel with the outlet duct 15 and along the outer surface thereof permits the conveyance of the gases generated in that region towards the end region of the chamber 2, conveying them finally to the outlet 14.
  • the temperature to which the residues to be recovered are subjected inside the recovery chamber 5 is sufficient to produce pyrolysis of the plastics material but insufficient to cause the metal in question to melt, for example, some 400°C.
  • the temperature can be higher than that of the combustion gases which are introduced into the chamber 3, being as much as some 500 - 600°C.
  • a plurality of support points are provided, such as those indicated in Figures 1 and 2 by the numerals 18, 19, 20 and 21, Figure 3 showing a detail of one of those supports with, at the inside, the roller bearing 22 which is produced from a temperature-resistant material and which reduces the friction of the rotary chamber inside the surrounding heating chamber.
  • the combustion gases inside the chamber 3 are discharged to the outside via the gas outlet 23 which comprises an extractor 24 for improving the draught.
  • an auxiliary pipe 25 may be provided for the introduction of an inert gas which permits scavenging of the gases formed during pyrolysis, thus promoting pyrolysis, and which can also be used for the initial scavenging of the treatment chamber.
  • both ends of the rotary chamber are provided with the necessary sealing means, both those which are necessary for the tubes for the introduction of the materials to be recovered and that corresponding to the drive shaft 6.
  • the apparatus forming the subject-matter of the present invention permits control of the process parameters, for example, temperatures, gas compositions and speeds and, above all, it will have safety detectors preventing critical temperatures from being exceeded, situations of possible gas explosion, etc.
EP98500217A 1998-06-18 1998-10-05 Verfahren zur Abtrennung von Metallen aus Verbundwerkstoffkörpern Withdrawn EP0965630A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES9801283 1998-06-18
ES9801283A ES2143423B1 (es) 1998-06-18 1998-06-18 Procedimiento para la separacion de metales de cuerpos laminados compuestos.

Publications (1)

Publication Number Publication Date
EP0965630A1 true EP0965630A1 (de) 1999-12-22

Family

ID=8304205

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98500217A Withdrawn EP0965630A1 (de) 1998-06-18 1998-10-05 Verfahren zur Abtrennung von Metallen aus Verbundwerkstoffkörpern

Country Status (2)

Country Link
EP (1) EP0965630A1 (de)
ES (1) ES2143423B1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2744896A1 (de) * 1977-10-06 1979-04-19 Peters Ag Claudius Vorrichtung zur verschwelung von industriemuell und herstellung von brenngasen
EP0324668A1 (de) * 1988-01-11 1989-07-19 Synthese Internationale Holding, S.A. Einrichtung zur Umwandlung von Abfällen
DE4237161A1 (de) * 1992-11-04 1994-05-05 Ellinghaus Umweltschutzanlagen Vorrichtung zum Aufbereiten von aluminiumhaltigen Materialien
DE4304294A1 (de) * 1993-02-12 1994-08-18 Strepp Gmbh & Co Kg Papierfabr Verfahren zur Gewinnung verwertbarer Stoffe aus Verbundmaterial

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5169476A (en) * 1991-11-27 1992-12-08 Polaroid Corporation Apparatus and method for delamination of a laminate
IT1273373B (it) * 1994-03-04 1997-07-08 Smaltiriva S P A Procedimento per la rimozione di rivestimenti a base di resine fluorocarboniche

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2744896A1 (de) * 1977-10-06 1979-04-19 Peters Ag Claudius Vorrichtung zur verschwelung von industriemuell und herstellung von brenngasen
EP0324668A1 (de) * 1988-01-11 1989-07-19 Synthese Internationale Holding, S.A. Einrichtung zur Umwandlung von Abfällen
DE4237161A1 (de) * 1992-11-04 1994-05-05 Ellinghaus Umweltschutzanlagen Vorrichtung zum Aufbereiten von aluminiumhaltigen Materialien
DE4304294A1 (de) * 1993-02-12 1994-08-18 Strepp Gmbh & Co Kg Papierfabr Verfahren zur Gewinnung verwertbarer Stoffe aus Verbundmaterial

Also Published As

Publication number Publication date
ES2143423B1 (es) 2000-12-16
ES2143423A1 (es) 2000-05-01

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