WO2008060160A1 - Poudre sèche réfractaire pour revêtements de creuset et de louche pour récipients métallurgiques - Google Patents

Poudre sèche réfractaire pour revêtements de creuset et de louche pour récipients métallurgiques Download PDF

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Publication number
WO2008060160A1
WO2008060160A1 PCT/NO2007/000390 NO2007000390W WO2008060160A1 WO 2008060160 A1 WO2008060160 A1 WO 2008060160A1 NO 2007000390 W NO2007000390 W NO 2007000390W WO 2008060160 A1 WO2008060160 A1 WO 2008060160A1
Authority
WO
WIPO (PCT)
Prior art keywords
composition
aluminium
glass
refractory
binder
Prior art date
Application number
PCT/NO2007/000390
Other languages
English (en)
Inventor
Richard Lemaire
Jacques Poirier
Rachelle Omnee
Marie-Laure Bouchetou
Original Assignee
Elkem As
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 Elkem As filed Critical Elkem As
Publication of WO2008060160A1 publication Critical patent/WO2008060160A1/fr

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Classifications

    • 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
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • 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
    • C04B35/10—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 aluminium oxide
    • C04B35/101—Refractories from grain sized mixtures

Definitions

  • Refractory dry powder for ladle and furnace linings for metallurgical vessels Refractory dry powder for ladle and furnace linings for metallurgical vessels.
  • the present invention relates to refractory compositions for use in the production of refractory articles such as furnace linings, ladle linings and linings for metallurgical vessels.
  • Refractory products are generally made using wet refractory compositions, however, it is preferable to use a dry technique in which the refractory composition is used in its dry state. This avoids the need for a separate drying step.
  • a dry technique is known, for example, from EP-A-64863.
  • One exothermic material known to be suitable for incorporation into a refractory composition is aluminium powder.
  • aluminium powder is effective, it can suffer a drawback in that in its elemental form, it is sometimes difficult to obtain a homogeneous distribution of the aluminium powder in the refractory mixture and thereby an even temperature and curing of the mixture when it is heated.
  • a refractory composition for the production of refractory articles comprising an exothermic material and finely divided glass.
  • the glass may be in the form of glass powder, glass flour as glass dust (fritte de verre in French). Such a composition is particularly suited for aluminium ladle applications.
  • the glass may be present as 0.1 to 20 wt%, preferably 0.2 to 15 wt% of the total composition, more preferably 3 to 10 wt%.
  • the glass particle size may be in the range 0 to 100 ⁇ m, and is preferably in the range 30 to 50 ⁇ m.
  • the exothermic material is aluminium or an aluminium based alloy with a high content of aluminium, preferably the aluminium content is above 40% and more preferably above 70%.
  • the aluminium can be aluminium foil, aluminium granules, aluminium chips, aluminium sawings and/or aluminium ash.
  • the aluminium ash may be a powder or granular material comprising elemental aluminium and other materials of a refractory nature, such as alumina.
  • the individual particles comprise an intimate admixture of these components.
  • the aluminium ash consists of aluminium particles surrounded by alumina. In the context of the refractory composition, this ash is exothermic.
  • the ash preferably comprises largely elemental aluminium and alumina.
  • the elemental aluminium may represent from 10 to 30 wt % of the ash, preferably about 15 to 25 wt %, e.g. about 20 wt %.
  • the composition may also contain aluminium foil powder.
  • the amount present may be up to 8 wt % preferably in the range 3 to 7 wt %.
  • the total elemental aluminium present represents at least 15 wt % of the total composition.
  • the composition additionally includes a binder, preferably inorganic.
  • Suitable binders include silicates, sulphates, carbonates, nitrates and borates. Particularly preferred binders are sodium salts, such as metasilicates.
  • composition according to the invention may consist of only the exothermic material, glass and the binder, but preferably the composition also contains other particulate refractory materials.
  • the particulate refractory material can be any suitable material, such as, bauxite, chamotte, alumina, silica, zirconia, fosterite, mullite, magnesia, kyanite, andalusite, silicon carbide and any combination of these. Particularly preferred are bauxite and chamotte.
  • the particulate refractory material represents from 10 to 50% wt % of the total composition.
  • At least one of the components has water either chemically or physically bound to it.
  • the water may be bound to the particulate material or may be bound to the binder. Most preferably, it is bound to the binder as water of crystallisation so that the binder is preferably a hydrated crystalline salt.
  • the composition may also include various other components which may be organic, such as wood flour, cellulose, fibres, granules and particles.
  • the refractory composition comprises:
  • a preferred composition comprises, in wt %:
  • a more preferred composition comprises, in wt %:
  • Glass powder 3-10 The invention also extends to products made from these compositions and methods for their production using the compositions.
  • Prefractory compositions were made by mixing together the following components. The percentages are by weight of the total composition unless otherwise indicated.
  • Aluminium alloy 22% (80% by weight of Al metallic content)
  • Material from Example 1 was tested for wear resistance according to the following technique. First, samples of the composition with varying amounts of glass powder were heated to temperatures of 800 0 C and 1000 0 C and each formed into a solid refractory part. The parts were weighed and then each was placed in a ball mill in the form of a metal cylinder with 30Og of stainless steel balls.
  • Figure 1 is a graph of % weight loss against time and shows the performance of the samples cured at 800 0 C.
  • the samples had glass powder contents of 1 wt %, 2 wt % and 3 wt %, and were compared against a control sample with no glass powder.
  • the part from the control sample disintegrated after about 4 minutes, while the parts from samples according to the invention showed significant and increasing durability with increasing glass powder content.
  • Figure 2 is a graph similar to Figure 1 but in this case, the samples were all cured at 1000 0 C. The results are similar to those of the samples cured at 800 0 C 1 shown in Figure 1, but the durabilityities are all generally higher.
  • control sample and the 3 wt % glass sample were tested for flexural strength, after heating at 1000 0 C.
  • Refractory compositions were made by mixing together the following components. The percentages are by weight of the total composition unless otherwise indicated.
  • Aluminium alloy 22% (80% by weight of Al metallic content)

Abstract

La présente invention concerne une composition réfractaire pour fabriquer des articles réfractaires tels que des revêtements de creuset et de louche et des revêtements de récipients métallurgiques. La composition comprend également de l'aluminium qui agit tel un matériau exothermique et du verre finement concassé.
PCT/NO2007/000390 2006-11-17 2007-11-07 Poudre sèche réfractaire pour revêtements de creuset et de louche pour récipients métallurgiques WO2008060160A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20065286A NO20065286L (no) 2006-11-17 2006-11-17 Refractory dry powder for ladle and furnace linings for metallurgical vessels
NO20065286 2006-11-17

Publications (1)

Publication Number Publication Date
WO2008060160A1 true WO2008060160A1 (fr) 2008-05-22

Family

ID=39401890

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2007/000390 WO2008060160A1 (fr) 2006-11-17 2007-11-07 Poudre sèche réfractaire pour revêtements de creuset et de louche pour récipients métallurgiques

Country Status (2)

Country Link
NO (1) NO20065286L (fr)
WO (1) WO2008060160A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB770757A (en) * 1954-04-14 1957-03-27 Harborough Construction Compan Improvements in and relating to the casting of metals
US3841884A (en) * 1973-08-03 1974-10-15 Kaiser Aluminium Chem Corp High alumina refractory
EP0064863A1 (fr) * 1981-05-08 1982-11-17 Quigley Company Inc. Couche monolithique et réfractaire pour récipients métallurgiques et méthode d'utilisation
DE4141186A1 (de) * 1990-12-13 1992-06-17 Roux Johan Heindrich Le Monolithische feuerfeste beschichtung
WO1994014727A1 (fr) * 1992-12-22 1994-07-07 Foseco International Limited Compositions refractaires
WO1997035677A1 (fr) * 1996-03-25 1997-10-02 Ashland Inc. Manchons, leur preparation et utilisation
WO2006091105A1 (fr) * 2005-02-03 2006-08-31 Elkem As Compositions refractaires

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB770757A (en) * 1954-04-14 1957-03-27 Harborough Construction Compan Improvements in and relating to the casting of metals
US3841884A (en) * 1973-08-03 1974-10-15 Kaiser Aluminium Chem Corp High alumina refractory
EP0064863A1 (fr) * 1981-05-08 1982-11-17 Quigley Company Inc. Couche monolithique et réfractaire pour récipients métallurgiques et méthode d'utilisation
DE4141186A1 (de) * 1990-12-13 1992-06-17 Roux Johan Heindrich Le Monolithische feuerfeste beschichtung
WO1994014727A1 (fr) * 1992-12-22 1994-07-07 Foseco International Limited Compositions refractaires
WO1997035677A1 (fr) * 1996-03-25 1997-10-02 Ashland Inc. Manchons, leur preparation et utilisation
WO2006091105A1 (fr) * 2005-02-03 2006-08-31 Elkem As Compositions refractaires

Also Published As

Publication number Publication date
NO20065286L (no) 2008-05-19

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