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
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
  • C04B28/06—Aluminous cements
• • 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
  • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
  • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
  • C04B35/6303—Inorganic additives
• • 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
  • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
  • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
  • C04B35/6303—Inorganic additives
  • C04B35/6316—Binders based on silicon compounds
• • 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
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
  • C04B2111/00482—Coating or impregnation materials
• • 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
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
  • C04B2111/0087—Uses not provided for elsewhere in C04B2111/00 for metallurgical applications
  • C04B2111/00887—Ferrous metallurgy
• • 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
  • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
  • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
  • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
  • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
  • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
• • 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

Definitions

• the present invention relates to an improved refractory concrete composition which has better physical properties, in particular with regard to resistance to high temperatures and mechanical resistance parameters. These compositions are in particular intended for metallurgical uses and other applications where high resistance of this composition to abrasion-compression is required and the invention extends to the application of said compositions for metallurgical uses, comprising a cold injection.
• Refractory concrete compositions are widely used for the lining of furnaces and ladles for metallurgical use, and in particular for the production of molded parts obtained by injecting concrete into jigs and intended for the continuous casting of steel. , such as so-called "tundish" distributors.
• a refractory concrete composition required the use of relatively large quantities (of the order of 20%) of binders in the form of refractory cement.
• the large quantity of binders required was due to the fact that the grains of binders formed lumps and were therefore not completely available with their entire surface for the function of binders.
• thixotropic concretes comprising deflocculating agents and, preferably, very fine binders, so that all the grains of the binder can exert their action. Because deflocculating agents destroy lumps, the content of refractory cement. composition may be somewhat lowered, which increases the temperature limit for use.
• EP-A-0004509 discloses refractory compositions useful for the production of pastes with a low water content intended to be sprayed into hot masonry, comprising the following essential constituents:
• compositions do not make it possible to reconcile the requirements of good resistance to high temperatures with rapid setting facilitating demolding or stripping of the template in which the product is injected cold.
• This composition which is intended for plugging tap holes and therefore for hot work.
• the presence of clay which disturbs the behavior of the composition when it is subjected to high temperatures makes it unsuitable for the use envisaged according to the invention.
• the present invention aims to produce refractory concrete compositions exhibiting good behavior at high temperature which are also capable of being cold injected into templates for the production of elements used in the continuous casting of steel and which characterized by grip behaviors such that rapid release is possible.
• the object of the invention is achieved by a refractory concrete composition consisting of 5 to 20%, and preferably approximately 10% of a binder consisting of silica with a particle size less than 5 microns and preferably between 0 and 2 ⁇ m and an aluminous compound with a high alumina content of a particle size less than 20 ⁇ m and preferably between 0 and 10 ⁇ m in a ratio of the order of 3 to 7 to allow mullitization at high temperature during processing, the balance of the composition to reach 100% consisting of a small proportion of refractory cement, by refractory aggregates, by conventional deflocculating agents and other possible additives.
• aluminous compound with a high alumina content means an alumina or a corundum containing more than 90% of Al 2 O 3 . It has also appeared to be particularly advantageous for said silica to contain 0.2 to 5.0% and preferably about 2% of carbon. Advantageously, this carbon covers the grains.
• the silica consequently takes on a gray to blackish appearance, in particular when it is wet and it seems that the presence of carbon contributes to improving the properties of the product, in particular with a view to its use by injection.
• the refractory cement present in said balance of the composition is chosen essentially as a function of the type of aggregates and is present in an amount, expressed relative to the total composition, of the order of about 0.5 to 15%, a content of the order of 12% constituting a typical example for a concrete consisting of chamotte with 44% Al 2 O 3 as aggregate. Since essentially the refractory cement is responsible for the lime content of the final composition, since the cement is essentially a lime aluminate, it will be understood that the refractory cement content will be chosen, towards the lowest contents compatible with the 'intended use and choice of refractory aggregates, in order to lower the final lime content.
• the aggregates added to the mixture are the conventional aggregates for the type of use envisaged.
• aluminous aggregates such as chamotte, in particular chamotte with a low alumina content (for example 28 to 32%) or a higher content (for example 40 to 45% or even 55 to 60%) kerphalite, bauxite, gypsum and also aggregates from the crushing of new or used bricks, corundum, etc.
• magnesian aggregates, chromite or zircon also falls within the scope of the invention .
• compositions will also contain conventional deflocculating agents in order to form thixotropic compositions such as silicates, phosphates, carbonates, or organic deflocculants such as humates, gluconates etc.
• deflocculating agents such as silicates, phosphates, carbonates, or organic deflocculants such as humates, gluconates etc.
• the composition may also contain other optional additives and, by way of example, mention may be made of the addition to the composition of ferrosilicon at a content of the order of 2%, this additive having the property of increasing the slump temperature under load as well as the addition of aluminum powder which allows easier drying of the product.
• composition of refractory concrete finds its application in all metallurgical uses.
• the composition has in particular the advantage that it can be prepared with a view to its use with very low water contents and that it exhibits good behavior, in particular during the miss by operation by needle vibration. or at the table as well as during an injection processing.
• the aluminous compound with a high alumina content with a particle size of less than 20 ⁇ m can advantageously be a corundum, a calcined alumina etc.
• compositions of the invention in particular with regard to the refractoriness characteristics, probably result from the mullitization which occurs during the temperature rise of the product, the compound which forms being mullite or a related compound whose properties contribute to better behavior of the concrete.
• the compounds of the invention can be used by any suitable means to form protective coatings or molded articles, in particular intended for installations for the continuous casting of steel.
• a mixture is prepared: Cement (lime aluminate type SECAR 70) 12% Chamotte at 44% Al 2 O 3 of grain size

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Inorganic Chemistry (AREA)
• Materials Engineering (AREA)
• Structural Engineering (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Ceramic Products (AREA)
• Furnace Housings, Linings, Walls, And Ceilings (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=19730178

Family Applications (2)

Family Applications After (1)

Country Status (4)

Cited By (1)

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Family Cites Families (7)

• 1983
  • 1983-11-28 LU LU85107A patent/LU85107A1/fr unknown
• 1984
  • 1984-11-22 ES ES537856A patent/ES537856A0/es active Granted
  • 1984-11-22 EP EP84904078A patent/EP0162871A1/fr not_active Withdrawn
  • 1984-11-22 EP EP84870158A patent/EP0144303A1/fr not_active Withdrawn
  • 1984-11-22 WO PCT/BE1984/000021 patent/WO1985002397A1/fr unknown

Non-Patent Citations (1)

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