NO20020717D0 - Produksjon av dampavsatt silika - Google Patents

Produksjon av dampavsatt silika

Info

Publication number
NO20020717D0
NO20020717D0 NO20020717A NO20020717A NO20020717D0 NO 20020717 D0 NO20020717 D0 NO 20020717D0 NO 20020717 A NO20020717 A NO 20020717A NO 20020717 A NO20020717 A NO 20020717A NO 20020717 D0 NO20020717 D0 NO 20020717D0
Authority
NO
Norway
Prior art keywords
vapor
production
deposited silica
silica
deposited
Prior art date
Application number
NO20020717A
Other languages
English (en)
Other versions
NO20020717L (no
Inventor
Robert J Barnett
Michael B Mezner
Original Assignee
Goldendale Aluminium Co
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 Goldendale Aluminium Co filed Critical Goldendale Aluminium Co
Publication of NO20020717D0 publication Critical patent/NO20020717D0/no
Publication of NO20020717L publication Critical patent/NO20020717L/no

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B7/00—Halogens; Halogen acids
    • C01B7/19—Fluorine; Hydrogen fluoride
    • C01B7/191—Hydrogen fluoride
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B7/00—Halogens; Halogen acids
    • C01B7/19—Fluorine; Hydrogen fluoride
    • C01B7/191—Hydrogen fluoride
    • C01B7/193—Preparation from silicon tetrafluoride, fluosilicic acid or fluosilicates
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00—Ammonia; Compounds thereof
    • C01C1/24—Sulfates of ammonium
    • C01C1/244—Preparation by double decomposition of ammonium salts with sulfates
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/20—Halides
    • C01F11/24—Chlorides
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/46—Sulfates
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
    • C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
    • C01F7/141—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by neutralisation with an acidic agent
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/20—Preparation of aluminium oxide or hydroxide from aluminous ores using acids or salts
    • C01F7/26—Preparation of aluminium oxide or hydroxide from aluminous ores using acids or salts with sulfuric acids or sulfates
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/48—Halides, with or without other cations besides aluminium
    • C01F7/50—Fluorides
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/48—Halides, with or without other cations besides aluminium
    • C01F7/56—Chlorides
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
    • C03C1/002—Use of waste materials, e.g. slags
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/0481—Other specific industrial waste materials not provided for elsewhere in C04B18/00
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
    • C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
    • C04B35/185—Mullite 3Al2O3-2SiO2
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/62204—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products using waste materials or refuse
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • 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
    • C22B21/0015—Obtaining aluminium by wet processes
    • 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
    • C22B21/0038—Obtaining aluminium by other processes
    • C22B21/0046—Obtaining aluminium by other processes from aluminium halides
    • 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
    • C22B21/0038—Obtaining aluminium by other processes
    • C22B21/0069—Obtaining aluminium by other processes from scrap, skimmings or any secondary source aluminium, e.g. recovery of alloy constituents
    • 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
    • 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
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Civil Engineering (AREA)
  • Silicon Compounds (AREA)
NO20020717A 1999-08-13 2002-02-12 Produksjon av dampavsatt silika NO20020717L (no)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/374,546 US6217840B1 (en) 1995-12-08 1999-08-13 Production of fumed silica
PCT/US2000/007689 WO2001012544A1 (en) 1999-08-13 2000-03-21 Production of fumed silica

Publications (2)

Publication Number Publication Date
NO20020717D0 true NO20020717D0 (no) 2002-02-12
NO20020717L NO20020717L (no) 2002-04-11

Family

ID=23477316

Family Applications (1)

Application Number Title Priority Date Filing Date
NO20020717A NO20020717L (no) 1999-08-13 2002-02-12 Produksjon av dampavsatt silika

Country Status (6)

Country Link
US (1) US6217840B1 (no)
EP (1) EP1228000A1 (no)
AU (1) AU771643B2 (no)
CA (1) CA2381389A1 (no)
NO (1) NO20020717L (no)
WO (1) WO2001012544A1 (no)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2807022B1 (fr) * 2000-03-28 2002-05-10 Pechiney Electrometallurgie Procede de recuperation de l'energie thermique des gaz d'un four d'electrometallurgie et application a la fabrication de poudre de silice
TWI355964B (en) * 2007-12-05 2012-01-11 Ind Tech Res Inst Method for catalytic treating perfluorocompound ga
US8124039B2 (en) * 2009-01-26 2012-02-28 Vithal Revankar Process of silicon tetrafluoride gas synthesis
US8388925B2 (en) 2009-12-30 2013-03-05 Memc Electronic Materials, Inc. Methods for producing aluminum trifluoride
US8529860B2 (en) * 2009-12-30 2013-09-10 Memc Electronics Materials, Inc. Methods for producing silicon tetrafluoride
US20110305621A1 (en) * 2010-06-11 2011-12-15 Kyung Hoon Kang Method Of Continuously Producing Tetrafluorosilane By Using Various Fluorinated Materials, Amorphous Silica And Sulfuric Acid
RU2537172C1 (ru) * 2012-08-30 2014-12-27 Общество с ограниченной ответственностью "Новые химические продукты" Способ получения фторида водорода
CN104925817B (zh) * 2013-12-20 2018-03-20 贵州万方铝化科技开发有限公司 纳米级二氧化硅的制备方法
CN105036139B (zh) * 2013-12-20 2017-02-22 贵州万方铝化科技开发有限公司 在制备含硅化合物的过程中循环利用氟化物的方法
BR112018000959A2 (pt) * 2015-07-28 2018-09-18 Rhodia Operations processo para a recuperação de sulfato de sódio
CN112758894A (zh) * 2020-12-30 2021-05-07 淄博华士元环保科技有限公司 利用含氟冰晶石固体废物制备氟化氢的方法

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US38285A (en) 1863-04-28 Fluosilicic acid
US2780523A (en) 1954-03-22 1957-02-05 Int Minerals & Chem Corp Process for recovering solid calcium fluoride containing product and colloidal silica solution from a weak aqueous fluosilicic acid solution
US3969485A (en) * 1971-10-28 1976-07-13 Flemmert Goesta Lennart Process for converting silicon-and-fluorine-containing waste gases into silicon dioxide and hydrogen fluoride
US4113831A (en) 1975-10-02 1978-09-12 National Fluoride And Chemical Corporation Recovery of sodium fluoride and other chemicals from spent carbon liners
US4508538A (en) 1977-01-24 1985-04-02 The Dow Chemical Company Recovery of fumed SiO2
US4113832A (en) 1977-11-28 1978-09-12 Kaiser Aluminum & Chemical Corporation Process for the utilization of waste materials from electrolytic aluminum reduction systems
US4160808A (en) 1978-05-30 1979-07-10 Andersen John N Pyrohydrolysis process for spent aluminum reduction cell linings
US4158701A (en) 1978-11-06 1979-06-19 Kaiser Aluminum & Chemical Corporation Pyrohydrolysis system for processing fluorine-containing spent and waste materials
US4308244A (en) 1980-03-28 1981-12-29 Occidental Research Corp. Process for producing fluorine compounds and amorphous silica
US4328196A (en) * 1980-09-25 1982-05-04 Pennzoil Company Production of alkali metal products from alkali metal fluosilicate
SE431197B (sv) 1980-12-12 1984-01-23 Flemmert Goesta Lennart Sett att genom hydrolys av kiseltetrafluorid i en laga framstella hogaktiv kiseldioxid med en partikelstorlek av 5-50 nm
SE431196B (sv) 1980-12-12 1984-01-23 Flemmert Goesta Lennart Sett att genom hydrolys av kiseltetrafluorid i en laga framstella finfordelad kiseloxid
US4394365A (en) 1981-01-05 1983-07-19 Alcan International Limited Method for curtailing phosphorous impurity in the production of hydrogen fluoride
US4355017A (en) * 1981-05-14 1982-10-19 Martin Marietta Corporation Aluminum electrolytic cell cathode waste recovery
US4477425A (en) * 1983-12-15 1984-10-16 Florida Progress Corporation Production of anhydrous hydrogen fluoride from low-grade metallic fluorides and sulfuric acid
JPH0627347B2 (ja) 1985-07-19 1994-04-13 日本板硝子株式会社 二酸化珪素被膜の製造方法
US4735784A (en) 1986-07-11 1988-04-05 Morrison-Knudsen Company, Inc. Method of treating fluoride contaminated wastes
US4915705A (en) 1986-08-01 1990-04-10 Freeport Research And Engineering Co. Production of silica and fluorine-containing coproducts from fluosilicic acid
US5024822A (en) 1988-03-29 1991-06-18 Aluminum Company Of America Stabilization of fluorides of spent potlining by chemical dispersion
US4981664A (en) 1988-04-14 1991-01-01 International Minerals & Chemical Corporation Method of production of high purity silica and ammonium fluoride
US5165907A (en) 1988-04-14 1992-11-24 Imcera Group Inc. Method of production of high purity silica and ammonium fluoride
US4927459A (en) 1989-03-17 1990-05-22 Imco Recycling Inc. Treatment of aluminum reduction cell linings combined with use in aluminum scrap reclamation
US5266289A (en) 1989-11-16 1993-11-30 Nissan Chemical Industries Ltd. Process for producing high-purity silica by reacting crude silica with ammonium fluoride
US5558847A (en) 1991-02-05 1996-09-24 Kaaber; Henning Process for recovering aluminium and fluorine from fluorine containing waste materials
US5164174A (en) 1991-10-11 1992-11-17 Reynolds Metals Company Detoxification of aluminum spent potliner by thermal treatment, lime slurry quench and post-kiln treatment
NO176648C (no) 1991-11-07 1995-05-10 Elkem Technology Fremgangsmåte for behandling av brukte katodebunner
US5222448A (en) 1992-04-13 1993-06-29 Columbia Ventures Corporation Plasma torch furnace processing of spent potliner from aluminum smelters
CA2118943C (en) 1992-07-24 2004-04-20 Ian Lewis Kidd Treatment of solid material
US5470559A (en) 1993-02-26 1995-11-28 Alcan International Limited Recycling of spent pot linings
US5478546A (en) 1993-03-12 1995-12-26 Shin-Etsu Chemical Co., Ltd. Process for preparing powder of silicon compound
US5340560A (en) 1993-04-30 1994-08-23 General Electric Company Method for making fumed silica having a reduced aggregate size and product
FR2732331B1 (fr) 1995-03-29 1997-06-20 Rhone Poulenc Chimie Nouveau procede de preparation de silice precipitee, nouvelles silices precipitees contenant du zinc et leur utilisation au renforcement des elastomeres
US5599520A (en) 1994-11-03 1997-02-04 Garces; Juan M. Synthesis of crystalline porous solids in ammonia
US5558690A (en) 1994-12-23 1996-09-24 Vortec Corporation Manufacture of ceramic tiles from spent aluminum potlining
US5538604A (en) 1995-01-20 1996-07-23 Emec Consultants Suppression of cyanide formation in electrolytic cell lining
ES2154748T3 (es) 1995-02-04 2001-04-16 Degussa Granulados a base de dioxido de silicio preparado por via pirogena, procedimiento para su preparacion y su empleo.
US5679315A (en) 1995-09-25 1997-10-21 Nu-West Industries, Inc. Method of production of high purity silica
US5723097A (en) 1995-12-08 1998-03-03 Goldendale Aluminum Company Method of treating spent potliner material from aluminum reduction cells
US5853685A (en) 1996-08-28 1998-12-29 Erickson; William R. Process for the production of high purity silica from waste by-product silica and hydrogen fluoride

Also Published As

Publication number Publication date
US6217840B1 (en) 2001-04-17
WO2001012544A1 (en) 2001-02-22
CA2381389A1 (en) 2001-02-22
AU3912200A (en) 2001-03-13
NO20020717L (no) 2002-04-11
AU771643B2 (en) 2004-04-01
EP1228000A1 (en) 2002-08-07

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