WO2001023315A1 - Procedes de formation de fibres anorganiques - Google Patents

Procedes de formation de fibres anorganiques Download PDF

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Publication number
WO2001023315A1
WO2001023315A1 PCT/GB2000/003590 GB0003590W WO0123315A1 WO 2001023315 A1 WO2001023315 A1 WO 2001023315A1 GB 0003590 W GB0003590 W GB 0003590W WO 0123315 A1 WO0123315 A1 WO 0123315A1
Authority
WO
WIPO (PCT)
Prior art keywords
fibres
fibre
volatile component
strontium
melting
Prior art date
Application number
PCT/GB2000/003590
Other languages
English (en)
Inventor
Gary Anthony Jubb
Original Assignee
The Morgan Crucible Company Plc
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 The Morgan Crucible Company Plc filed Critical The Morgan Crucible Company Plc
Priority to AU73017/00A priority Critical patent/AU7301700A/en
Publication of WO2001023315A1 publication Critical patent/WO2001023315A1/fr

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Classifications

    • 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
    • C03C13/00—Fibre or filament compositions

Definitions

  • This invention relates to methods of making man-made inorganic oxide fibres containing strontium oxide.
  • the invention also relates to products formed by such methods.
  • Inorganic fibrous materials are well known and widely used for many purposes (e.g. as thermal or acoustic insulation in bulk, mat, or blanket form, as vacuum formed shapes, as vacuum formed boards and papers, and as ropes, yarns or textiles; as a reinforcing fibre for building materials; as a constituent of brake blocks for vehicles).
  • thermal or acoustic insulation in bulk, mat, or blanket form as vacuum formed shapes, as vacuum formed boards and papers, and as ropes, yarns or textiles; as a reinforcing fibre for building materials; as a constituent of brake blocks for vehicles.
  • the properties for which inorganic fibrous materials are used require resistance to heat, and often resistance to aggressive chemical environments.
  • Inorganic fibrous materials can be either glassy or crystalline. Asbestos is an inorganic fibrous material one form of which has been strongly implicated in respiratory disease.
  • fibres As intercellular fluid is saline in nature the importance of fibre solubility in saline solution has long been recognised. If fibres are soluble in physiological saline solution then, provided the dissolved components are not toxic, the fibres should be safer than fibres that are not so soluble. The shorter the time a fibre is resident in the body the less damage it can do.
  • Refractory fibres generally are formed by the steps of: -
  • the disruption can be by many methods but typically a jet of air is used (blowing) or the stream impinges on spinning discs (spinning) although other methods such as centrifugal formation of fibres have been proposed.
  • Strontium is found chiefly as the minerals celestite (SrS0 4 ) and strontianite (SrC0 3 ).
  • Use of a sulphate such as SrS0 4 would be hazardous since on melting copious amounts of sulphur dioxide would be produced which would be hazardous and corrosive and would require complex and expensive extraction apparatus.
  • the present invention provides a method of fo ⁇ ning fibres comprising SrO, A1 2 0 3 , and a fibre-forming additive, the method comprising the steps of a) mixing:- i) a compound of strontium which on heating loses a volatile component ii) A1 2 0 3> and iii) a fibre fo ⁇ ning additive b) calcining the mixture to remove the volatile component c) melting the calcined mixture d) disrupting the melt to form fibres.
  • the present invention provides a method of forming fibres comprising SrO, A1 2 0 3 , and a fibre-forming additive, the method comprising the steps of:- a) mixing: - i) a compound of strontium which on heating loses a predominantly non-toxic volatile component ii) A1 2 0 3> and iii) a fibre forming additive b) forming granules from the mixture of a sufficient size to resist ejection from the melt by outgassing c) melting the granules and extracting the predominantly non-toxic volatile component d) disrupting the melt to form fibres
  • the first alternative has the advantages that:- a) no additional gas extraction is required at the melting step, evolution of gas taking place primarily or entirely on calcining b) a stable non-irritant intermediate (in the form of the calcined mixture) is produced which is easy to handle and/or transport c) it does not involve significant outgassing at the melting stage d) extraction of gas takes
  • the second alternative has the advantages that:- a) a stable non-irritant intermediate (in the form of the granulated mixture) is produced which is easy to handle and/or transport b) although there is significant outgassing at the melting stage the granulated product is sufficiently heavy to resist ejection from the melt c) the granules provide a continuous path between granules by which the gas can escape without causing explosive eruptions in the batch above the melt. but has the disadvantage that an additional processing step is required and gas extraction is required at the melting step. If no localised extraction is present then the amount of toxic volatile components in the predominantly non-toxic volatile component must be kept low to minimise worker exposure. For example, if no extraction is provided and SrC0 3 is used as the strontium compound it must have a low S0 3 content, e.g. of ⁇ 0.1%, preferably ⁇ 0.05%.
  • the A1 2 0 3 and/or the fibre forming additive or part thereof may be in the form of compounds with a volatile component that is lost on melting.
  • the strontium is in the form of a carbonate.
  • compositions plotted in Fig.l include those described in WO96/04214. Such compositions may contain impurities and these should amount to less than 10%, preferably to less than 5%, of the composition so that the compositions comprise more than 90%, preferably more than 95% SrO-Al 2 0 3 -Si0 2 .
  • the compositions contain less than 3wt%, more advantageously less than 2wt% and still more advantageously less than lwt% incidental impurities.
  • the compositions were tested for shrinkage and the results, normalised to 100% SrO-Al 2 0 3 -Si0 2 , are plotted on the three co-ordinate graph of Fig.1. Contours are drawn around the compositions tested as having shrinkage of less than 3.5% at 1260°C, 1300°C, 1400°C, 1450°C, 1500°C, and 1550°C respectively.
  • Provision of high capacity gas extraction in a commercial fibre forming plant would add considerably to the cost and complexity of the plant. Loss of powder from the melting chamber would not only create a mess in a commercial fibre forming plant it would also make it difficult to form fibres of a consistent quality.
  • one method of producing fibre includes the step of providing an initial charge of calcined or granulated material, melting these materials to form a melt pool, and adding un-calcined or un-granulated material to the melt pool at a sufficiently low rate not to produce explosive evolution of gas.
  • a prefe ⁇ ed range of compositions specified in WO96/04214 was that the fibres comprise at least 90%, preferably at least 95%, by weight SrO, A1 2 0 3 , and a fibre forming additive, and had a composition comprising: - SrO 41.2wt% - 63.8wt%
  • the applicant's cu ⁇ ently prefe ⁇ ed range is that formed by the >1400°C contour of Fig.l and in particular the composition:-
  • incidental impurities ⁇ 3wt% preferably less than 2wt%, more preferably less than lwt%.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Fibers (AREA)

Abstract

L'invention concerne un procédé de formation de fibres contenant SrO, Al2O3, et un additif servant à former des fibres. Ledit procédé consiste soit à a) mélanger i) un composé de strontium qui lorsqu'il est chauffé, perd un composé volatile, ii) Al2O3, et iii) un additif servant à former des fibres, b) calciner le mélange de manière à éliminer le composé volatile, c) faire fondre le mélange calciné, soit à a) mélanger i) un composé de strontium qui lorsqu'il est chauffé, perd un composé volatile surtout non toxique, ii) Al2O3, et iii) un additif servant à former des fibres, b) constituer à partir du mélange des granules d'une taille suffisante pour résister à l'éjection d'une matière fondue par dégazage, c) faire fondre les granules et extraire le composé volatile surtout non toxique suivi, le cas échéant, par d) la dissociation de la matière fondue pour former des fibres.
PCT/GB2000/003590 1999-09-27 2000-09-19 Procedes de formation de fibres anorganiques WO2001023315A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU73017/00A AU7301700A (en) 1999-09-27 2000-09-19 Methods of making inorganic fibres

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9922834.8 1999-09-27
GB9922834A GB2353996B (en) 1999-09-27 1999-09-27 Methods of making inorganic fibres

Publications (1)

Publication Number Publication Date
WO2001023315A1 true WO2001023315A1 (fr) 2001-04-05

Family

ID=10861680

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2000/003590 WO2001023315A1 (fr) 1999-09-27 2000-09-19 Procedes de formation de fibres anorganiques

Country Status (3)

Country Link
AU (1) AU7301700A (fr)
GB (1) GB2353996B (fr)
WO (1) WO2001023315A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4287142A (en) * 1967-07-02 1981-09-01 Rockwool International A/S Process for the production of mineral wool products
WO1993015028A1 (fr) 1992-01-17 1993-08-05 The Morgan Crucible Company Plc Fibres inorganiques, solubles en solution saline
WO1994015883A1 (fr) 1993-01-15 1994-07-21 The Morgan Crucible Company Plc Fibres solubres inorganiques salines
US5338709A (en) * 1992-09-08 1994-08-16 Solvay Barium Strontium Gmbh Process for producing granulated strontium carbonate with a strontium-containing binder
WO1996002478A1 (fr) * 1994-07-13 1996-02-01 The Morgan Crucible Company Plc Fibres inorganiques solubles en solution saline
WO1996004214A1 (fr) 1994-08-02 1996-02-15 The Morgan Crucible Company Plc Fibres organiques
EP0754652A1 (fr) * 1995-07-12 1997-01-22 Nitto Boseki Co., Ltd. Laine de roche à haute résistance et son procédé de fabrication

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR745566A (fr) * 1932-01-22 1933-05-12
DE1154215B (de) * 1962-02-08 1963-09-12 Patra Patent Treuhand Anorganischer Leuchtstoff und Verfahren zu seiner Herstellung

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4287142A (en) * 1967-07-02 1981-09-01 Rockwool International A/S Process for the production of mineral wool products
WO1993015028A1 (fr) 1992-01-17 1993-08-05 The Morgan Crucible Company Plc Fibres inorganiques, solubles en solution saline
US5338709A (en) * 1992-09-08 1994-08-16 Solvay Barium Strontium Gmbh Process for producing granulated strontium carbonate with a strontium-containing binder
WO1994015883A1 (fr) 1993-01-15 1994-07-21 The Morgan Crucible Company Plc Fibres solubres inorganiques salines
WO1996002478A1 (fr) * 1994-07-13 1996-02-01 The Morgan Crucible Company Plc Fibres inorganiques solubles en solution saline
WO1996004214A1 (fr) 1994-08-02 1996-02-15 The Morgan Crucible Company Plc Fibres organiques
EP0754652A1 (fr) * 1995-07-12 1997-01-22 Nitto Boseki Co., Ltd. Laine de roche à haute résistance et son procédé de fabrication

Also Published As

Publication number Publication date
GB2353996A (en) 2001-03-14
AU7301700A (en) 2001-04-30
GB9922834D0 (en) 1999-11-24
GB2353996B (en) 2001-07-25

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