EP0998588B1 - Cuve inertee pour le traitement de metal liquide oxydable - Google Patents

Cuve inertee pour le traitement de metal liquide oxydable Download PDF

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Publication number
EP0998588B1
EP0998588B1 EP98937596A EP98937596A EP0998588B1 EP 0998588 B1 EP0998588 B1 EP 0998588B1 EP 98937596 A EP98937596 A EP 98937596A EP 98937596 A EP98937596 A EP 98937596A EP 0998588 B1 EP0998588 B1 EP 0998588B1
Authority
EP
European Patent Office
Prior art keywords
vessel
lid
liquid metal
seal
vessel body
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.)
Expired - Lifetime
Application number
EP98937596A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0998588A1 (fr
Inventor
Jacques Moriceau
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.)
Rio Tinto France SAS
Constellium Issoire SAS
Original Assignee
Aluminium Pechiney SA
Pechiney Rhenalu SAS
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 Aluminium Pechiney SA, Pechiney Rhenalu SAS filed Critical Aluminium Pechiney SA
Publication of EP0998588A1 publication Critical patent/EP0998588A1/fr
Application granted granted Critical
Publication of EP0998588B1 publication Critical patent/EP0998588B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0073—Seals
    • 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
    • C22B21/064—Obtaining aluminium refining using inert or reactive gases
    • 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
    • C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1808—Removable covers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D2001/0059—Construction elements of a furnace
    • F27D2001/0069—Means to prevent heat conduction
    • F27D2001/0073—Surrounding protection around the furnace, e.g. covers, circulation of gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
    • F27D2003/0036—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities comprising inflatable or extendable parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
    • F27D2019/0009—Monitoring the pressure in an enclosure or kiln zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D27/00—Stirring devices for molten material

Definitions

  • the invention relates to a tank or pocket for processing liquid metal easily.
  • oxidizable comprising one or more devices making it possible to prevent gases harmful to the liquid metal or the equipment in the tank, do not enter the tank, said tank thus being inerted.
  • the harmful gases are generally gases containing oxygen and / or water vapor.
  • This treatment includes in particular the insufflation of a gas (in general argon with or without chlorine) for example using a submerged dispersion rotor in the liquid metal whose drive shaft and the turbine are often in graphite and / or simple filtration through a bed of filter material, for example a piece of porous ceramic or any other filter medium.
  • a gas in general argon with or without chlorine
  • a submerged dispersion rotor in the liquid metal whose drive shaft and the turbine are often in graphite and / or simple filtration through a bed of filter material, for example a piece of porous ceramic or any other filter medium.
  • the Applicant has therefore sought to develop an inert treatment tank avoiding any harmful contact between the liquid metal and the atmosphere exterior, the tank must always be as compact and even more economical and easier to implement and operate.
  • tanks firstly comprise a tank body essentially comprising an external steel box, the internal walls of which are lined with a relatively porous and as inert as possible refractory masonry compared treated metal.
  • the interior layout depends on the treatment (s) that one wants to subject the metal.
  • the masonry tank thus produced can be divided into compartments using separating walls also in inert refractory masonry.
  • This masonry is at least partly made using mortar and insulation refractory.
  • the box has a plurality of holes for allow the evacuation of water vapor and drying gases. They also serve the evacuation of part of the water vapor taken up by the refractories and / or insulators, or more generally by lining coverings, during shutdowns and emptying of the tank, another part of said water vapor being able to go pollute the metal treated in the tank.
  • the tanks also have a cover crossed by equipment necessary for carrying out the often removable treatment process (i.e. that they can be removed from the tank) and / or mobile.
  • These are in particular the means process gas injection, usually dispersion turbines located at the end of a rotor shaft; this rotor can pass through the cover as is or can sometimes be surrounded by a fixed sheath, the assembly remaining removable; these are also the means for heating the liquid metal, for example of the immersion heater type partly immersed in the liquid metal, which can be removable, or temperature measurement means (thermocouples).
  • the tank body includes, like the cover, a metallic external wall, possibly perforated, upholstered inside the refractory. There are generally a guard space between the cover and the surface of the molten metal.
  • the tank body may have a drain hole at its base passing through its wall and closable for example by a removable stopper.
  • All these ancillary equipment can be the source of humid air inlets parasites, detrimental to the quality of the treated metal; it is therefore necessary to to avoid.
  • the invention is an inert tank for the treatment of oxidizable liquid metal as defined in claim 1.
  • the waterproof, generally metallic, steel overwrap is hermetically sealed close. It can consist of several parts assembled by joints.
  • the double jacket thus obtained contains a dry and preferably inert gas, for example nitrogen or argon. It may be a weak gas stream, the overwrap then comprises at least one gas inlet and outlet generally calibrated and / or closable, or of a static atmosphere whose pressure is controlled to be slightly above atmospheric pressure.
  • It may include a drain valve located at a low point on the body or cover to evacuate condensations from refractories and passing through the holes in the wall.
  • the inflatable peripheral seal used to obtain the seal between the tank body and its cover includes a simple elastomeric flange holding to the temperature, inflated by a preferably neutral gas at a suitable pressure in relationship with the weight of the cover and the condition of the bearing surfaces to be sealed.
  • Such a device is an important means of the invention and proves to be particularly effective while being economical and simple to implement; it effectively insulates the interior of the tank and the surface of the metal bath liquid from the outside atmosphere safely because it adapts perfectly to bearing surfaces integral with the cover and the tank body to be sealed which generally have irregular geometries, often left profiles, approximate flatness and are easily deformable; so it allows him only good inerting of the tank.
  • the cover simply placed on the inflatable tube and making the tightness thanks to its own weight, is easy to handle from a distance, quickly and automatically, thus avoiding any risk for personnel.
  • the inerted tank it is sometimes advantageous for the inerted tank to have at least this double envelope which makes it possible to avoid the return of humidity by the refractory masonry during tank stops and emptying and then polluting release of this moisture into the metal being treated.
  • the inerting of the tank is further improved when the tank is itself equipped an inflatable seal and / or sealing means on equipment bushings auxiliaries.
  • the tank remains closed during said temperature maintenance and / or emptying operations.
  • Auxiliary equipment allowing to carry out and control the treatment of liquid metal are generally removable, i.e. they can be handled, through the cover or the tank body, to position or extract them from the liquid metal using lifting devices; these are in particular the devices supply of process gas (for example the turbine drive shaft of the rotor), heating the liquid metal (for example of the immersion heaters type immersed part), temperature measurement (for example thermocouple in part immersed).
  • process gas for example the turbine drive shaft of the rotor
  • heating the liquid metal for example of the immersion heaters type immersed part
  • temperature measurement for example thermocouple in part immersed.
  • Said equipment can also be mobile such as for example the shaft rotary of the gas injector, when it is not protected by a sheath of fixed protection.
  • the flange and its cable gland can also be attached to the cover or tank body removably but watertight, using a seal and means of tightening, to a first flange fixed directly and tightly (for example welding) to said cover or tank body, which facilitates disassembly and maintenance.
  • This two-way waterproof device is particularly effective in ensuring the isolation of liquid metal from the outside atmosphere, especially when a gas overpressure prevails inside the tank or when accidentally it occurs produces a depression due for example to unexpected cooling.
  • the equipment is subject, for by means of a seal, to a counter-flange fixed or welded tightly on the cover or the tank body.
  • the pressure regulating device inside the tank comprises typically gas supply and outlet pipes passing through the cover and works with dry gas, for example dry air, nitrogen or argon.
  • the hose outlet generally equipped with a pressure adjustment valve can be used also evacuation of the treatment gases introduced into the liquid metal.
  • the pressure regulating device can also be used to introduce into the tank a stream of inert gas sweeping the surface of the liquid metal being treatment or to keep the tank under dry and inert gas.
  • It also includes an apparatus with pressure regulation loop conventional comprising comparing the pressure in the tank with a value of setpoint and activation accordingly of the adjustment valves located on the gas inlet and outlet pipes. Additionally it can combine a gas flow regulation.
  • This device is particularly effective when it is used in addition with cover sealing devices to avoid surface pollution liquid metal and premature combustion or wear of equipment oxidizable, for example graphite.
  • FIG. 1 presents an overall diagram of an inerted treatment tank, involving gas injection using a submersible rotor and equipment auxiliaries; it combines several inerting means according to the invention.
  • the tank has a double external envelope, an inflatable seal between cover and tank body, sealing means of the cable gland type on removable and / or mobile equipment passing through the cover and the body of tank and a pressure regulating device inside the tank.
  • Wall metal (2) is pierced with a multitude of holes (not shown) allowing the evacuation of water vapor from the refractory during its drying; she is surrounded by an overwrap (4) to form a double wall; it's interior space (5) of this double wall which contains a dry gas at a pressure higher than the atmospheric pressure to prevent the outside atmosphere from coming into contact with the refractory lining and may pollute the liquid metal.
  • the dry gas is introduced into the double wall (5) through the tube (6) using a automatic pressure regulation (7) actuating the valve (8), the pressure being measured via the circuit (9).
  • the outer covering (4) comprises at (10) a nozzle fitted with a valve located at the bottom point to evacuate the water condensations.
  • the interior of the tank is divided into compartments using a separating wall (12) refractory.
  • the cover comprises a refractory lining (13) disposed on the inner face of the metal wall (14) itself surrounded by an overwrap (15) to obtain a double wall filled with gas;
  • the gas supply device has not been shown, it may be identical to that of the tank body.
  • the input and output devices for liquid metal of the "source” type, in which it is the liquid metal itself which ensures the isolation between the interior of the tank and the external atmosphere, may be identical .
  • It comprises a channel (16) for supplying liquid metal, an inclined well (17) made in the wall of the tank body, such that the orifice opening into the tank is located located under the level (18) of the liquid metal in normal operation.
  • a waterproof, mobile or adjustable shutter valve (19) can be provided in the case where the level of metal in the tank is insufficient or in the absence of said metal, for example example during emptying or filling operations.
  • the tank is closed by the cover using an inflatable peripheral seal (20) ensuring the isolation of the interior of the tank and making it possible to overpressure.
  • an equally peripheral housing including at least one wall (21) (here there are two) is integral with the cover and serves as a seal surface and of which at least one other wall (22) (here there are two) is integral with the tank body and also serves as a seal seat.
  • the housing section is a quadrilateral, but it could have another shape, for example circular.
  • the inflatable seal is generally made of flexible elastomer which is resistant to temperature. It advantageously has a rectangular section which allows better contact with bearing surfaces and better sealing.
  • the seal is obtained by inflating the seal, generally with nitrogen, which then presses against the walls of the housing acting as a bearing surface.
  • Such a device is particularly suitable because it takes very good account of the flatness defects of said spans or those of dimensioning of its housing, inherent in this type of large tank, even when these defects are accentuated or modified by the fact that the The tank is also subjected to repeated heating and cooling cycles.
  • the gas supply to the inflatable seal is carried out via the tube (23) using the pressure regulator (24).
  • the pressure regulating device inside the tank includes a supply line (25) connected to a gas pressure regulator (26) acting on the valve (27).
  • the outlet pipe (28) serves both as a pressure tap for the regulator (26) and as an outlet for the liquid metal treatment gases; he is equipped an adjustable valve (29).
  • a gas flow regulator can be coupled to the pressure regulator (26) in the case where we want to sweep the surface of liquid metal during treatment, or more generally the interior of the tank, by an inert gas while maintaining a pressure higher than atmospheric pressure.
  • a rotor for injecting gas comprising a turbine (30) immersed in the liquid metal, driven by a tree (31).
  • the sealing device comprises a first flange (32) fixed in a sealed manner (e.g. solder, joint, etc.) on the cover, to which is secured by through a seal (33), a cable gland device comprising a flange or crown piece (34), surrounding the shaft (31), sufficiently thick to contain a circular housing adapted to the diameter of the tree, in which takes up a braid (35) compressed by the counter flange or special crown (36) bolted to the part (34).
  • a first flange fixed in a sealed manner (e.g. solder, joint, etc.) on the cover, to which is secured by through a seal (33)
  • a cable gland device comprising a flange or crown piece (34), surrounding the shaft (31), sufficiently thick to contain a circular housing adapted to the diameter of the tree, in which takes up a braid (35) compressed by the counter flange or special crown (36) bolted to the part (34).
  • This waterproof device allows the tree to turn, to adjust it in height or to extract it from the tank.
  • the element heater (37) (of the immersion heater type) with one end immersed in the metal liquid, the other end emerging from the tank.
  • the tightness of the passage through the cover is provided, as for the rotor shaft, by a device sealing comprising a first flange (38) sealingly attached to the cover, to which is secured by means of a waterproof seal (39) the proper cable gland device (40) like the one seen above (34-35-36) for the rotor shaft (31).
  • Thermocouples or any other equipment may also be installed in a fixed or removable manner according to the invention.
  • the drain hole comprising a conduit (41) closed by a stopper (42) operated by a rod (43).
  • a stopper (42) operated by a rod (43) operated by a rod (43).
  • the same devices as for the immersion heater can be used, for example a first flange (44) surrounding the external orifice of the duct (41), to which is secured, as previously by the 'Intermediate of a seal (45), the actual cable gland device (46) sealing on the operating rod (43).
  • the gaskets or packing braids are generally based on graphite but can also be usual elastomer O-rings if the temperature of the flanges where they are installed allows. Seals can also be used inflatable or any other appropriate technique.
  • This example of the invention would also apply to a treatment tank for filtration of liquid metal or a mixed gas treatment tank and filtration.
  • the invention allows a more efficient and complete degassing of the metal by avoiding any contact of the liquid metal with the water vapor which could cause a re-gassing of the metal or with the air which could pollute it.
  • This contact can occur on the free surface of the metal and at the interface between said metal and the lining having a porosity of several percent, hence the advantage of using, in addition to the inerting of the surface.
  • of liquid metal resulting from the use of the inflatable seal and optionally from the overpressure in the tank, a double-walled tank to avoid any harmful diffusion of humidity or air through said lining, the inerting being further improved by sealing the passages of removable and / or mobile auxiliary equipment through the enclosure of the tank.
  • the invention also makes it possible to avoid premature wear of the parts. consumables, for example graphite, by oxidation. Indeed in the absence inerting a temperature of about 500 to 700 ° C prevails in the space above liquid metal and is very favorable to oxidation by air which can be there find and renew by natural convection.
  • the inerting devices according to the invention making it possible to isolate the space surmounting the liquid metal, in particular with the seal between the tank body and the cover, advantageously supplemented by the sealing devices of the auxiliary equipment and / or the pressure regulation, avoid the presence of oxygen and water vapor. There is then no longer any excessive oxidation of the liquid metal, the quantity of dross formed being able to be reduced so significantly that it is practically no longer necessary to carry out interventions to eliminate them, whatever the conditions of use of the tank. Similarly, the hydrogen level of said liquid metal is and remains low.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • ing And Chemical Polishing (AREA)
  • Furnace Details (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
EP98937596A 1997-07-16 1998-07-09 Cuve inertee pour le traitement de metal liquide oxydable Expired - Lifetime EP0998588B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9709238 1997-07-16
FR9709238A FR2766209B1 (fr) 1997-07-16 1997-07-16 Cuve de traitement de metal liquide inertee
PCT/FR1998/001487 WO1999004046A1 (fr) 1997-07-16 1998-07-09 Cuve inertee pour le traitement de metal liquide oxydable

Publications (2)

Publication Number Publication Date
EP0998588A1 EP0998588A1 (fr) 2000-05-10
EP0998588B1 true EP0998588B1 (fr) 2001-11-07

Family

ID=9509436

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98937596A Expired - Lifetime EP0998588B1 (fr) 1997-07-16 1998-07-09 Cuve inertee pour le traitement de metal liquide oxydable

Country Status (11)

Country Link
US (1) US6331269B1 (es)
EP (1) EP0998588B1 (es)
JP (1) JP2001510238A (es)
AT (1) ATE208434T1 (es)
AU (1) AU8633898A (es)
CA (1) CA2296749C (es)
DE (1) DE69802409T2 (es)
ES (1) ES2166180T3 (es)
FR (1) FR2766209B1 (es)
NO (1) NO322601B1 (es)
WO (1) WO1999004046A1 (es)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO310115B1 (no) * 1999-09-03 2001-05-21 Norsk Hydro As Utstyr for smeltebehandling
DE102004062871B4 (de) * 2004-12-21 2014-04-30 Sms Siemag Aktiengesellschaft Metallurgisches Gefäß mit Befestigungssystem
DE102008027006A1 (de) 2007-12-03 2009-06-04 Sms Mevac Gmbh Vorrichtung zur sekundär- und vakuum-metallurgischen Behandlung von flüssigem Stahl
KR101367301B1 (ko) * 2011-09-17 2014-02-28 주식회사 포스코 플럭스 공급장치 및 공급방법

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3677332A (en) * 1969-06-13 1972-07-18 George A Smiernow Vacuum casting process
US3870511A (en) * 1971-12-27 1975-03-11 Union Carbide Corp Process for refining molten aluminum
DE2815011A1 (de) * 1978-04-07 1979-10-18 Bleickert Gerhard Abdichtvorrichtung fuer vakuumanlagen
JPS57175701A (en) * 1981-04-20 1982-10-28 Hiroshi Ishizuka Chlorination furnace and its operation
JPH0665729B2 (ja) * 1986-04-11 1994-08-24 昭和アルミニウム株式会社 溶融金属処理装置
DE3904200A1 (de) * 1989-02-13 1990-08-16 Kempchen & Co Gmbh Dichtungsanordnung, insbesondere hochdruck-dichtungsanordnung
DE19518361C1 (de) * 1995-05-19 1996-08-08 Technometal Ges Fuer Metalltec Vakuumdichtes Reaktionsgefäß für die Stahlbehandlung mit einer Stopfbuchse

Also Published As

Publication number Publication date
US6331269B1 (en) 2001-12-18
ES2166180T3 (es) 2002-04-01
FR2766209B1 (fr) 1999-08-27
CA2296749C (fr) 2007-09-18
JP2001510238A (ja) 2001-07-31
NO20000206D0 (no) 2000-01-14
ATE208434T1 (de) 2001-11-15
AU8633898A (en) 1999-02-10
FR2766209A1 (fr) 1999-01-22
NO20000206L (no) 2000-03-16
EP0998588A1 (fr) 2000-05-10
DE69802409D1 (de) 2001-12-13
DE69802409T2 (de) 2002-08-29
WO1999004046A1 (fr) 1999-01-28
NO322601B1 (no) 2006-10-30
CA2296749A1 (fr) 1999-01-28

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