CA2573278C - High durability refractory composition - Google Patents
High durability refractory composition Download PDFInfo
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- CA2573278C CA2573278C CA2573278A CA2573278A CA2573278C CA 2573278 C CA2573278 C CA 2573278C CA 2573278 A CA2573278 A CA 2573278A CA 2573278 A CA2573278 A CA 2573278A CA 2573278 C CA2573278 C CA 2573278C
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- 239000000203 mixture Substances 0.000 title claims abstract description 162
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 78
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 39
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000000292 calcium oxide Substances 0.000 claims abstract description 28
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000011819 refractory material Substances 0.000 claims abstract description 17
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 26
- 239000000920 calcium hydroxide Substances 0.000 claims description 26
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 26
- 239000000080 wetting agent Substances 0.000 claims description 18
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 14
- 235000012255 calcium oxide Nutrition 0.000 abstract description 19
- 238000004519 manufacturing process Methods 0.000 abstract description 16
- 235000012245 magnesium oxide Nutrition 0.000 description 35
- 239000011230 binding agent Substances 0.000 description 10
- 239000011449 brick Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical group [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 3
- IIACRCGMVDHOTQ-UHFFFAOYSA-N sulfamic acid group Chemical group S(N)(O)(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-N 0.000 description 3
- 239000008030 superplasticizer Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical class [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- 235000014380 magnesium carbonate Nutrition 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000006259 organic additive Substances 0.000 description 2
- 150000003460 sulfonic acids Chemical class 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229920001353 Dextrin Polymers 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 239000011822 basic refractory Substances 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011823 monolithic refractory Substances 0.000 description 1
- 150000002790 naphthalenes Chemical class 0.000 description 1
- 125000001624 naphthyl group Chemical group 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 239000005365 phosphate glass Substances 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000011269 tar Substances 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K21/00—Fireproofing materials
- C09K21/02—Inorganic 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
- 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
- C04B35/03—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
- C04B35/043—Refractories from grain sized mixtures
-
- 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
- C04B35/632—Organic 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
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K21/00—Fireproofing 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
- 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
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
-
- 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
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/448—Sulphates or sulphites
-
- 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
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S57/00—Textiles: spinning, twisting, and twining
- Y10S57/904—Flame retardant
Abstract
A high temperature hot strength magnesia-based refractory composition having high durability at elevated temperatures wherein a sulfamic acid in combination with an independent calcia source is added to magnesia-based refractory material. The invention also provides for a refractory gunning composition for use in the production or repair of metallurgical furnace linings.
Description
High Durability Refractory Composition FIELD OF THE INVENTION
This invention relates to refractory compositions. More particularly, this invention relates to magnesia-based refractory compositions useful in maintenance gunning of metallurgical vessels, in ramming mixtures, in castable refractories, and in basic refractory brick.
Most particularly this invention relates to refractory compositions, especially gunning mixtures, which are chemically adhered by means of a binder system having high temperature hot strength.
BACKGROUND OF THE INVENTION
In the production of steel, the refractory brick linings of conventional process vessels generally wear unevenly due to hot spots, slag attack, or other operating parameters. In the ongoing attempt to minimize production costs, a major concern of steel makers is the wearing of the refractory brick lining of the vessel and the resultant consumption of refractory composition to replace the lining. In order to extend the useful life of such linings, it has become acceptable practice to repair excessively worn areas between heats by means of gunning granular refractory compositions onto the brick surfaces. For example, a dry mixture including granular refractory grain is pneumatically delivered to a nozzle of a spray gun where it is mixed with water, resulting in a bonded composition that is projected against the irregularly worn surface, thereby filling in or patching the unevenly worn refractory lining with the refractory composition. Under the usual circumstances, gunning is initiated within minutes after the molten steel is tapped from the hot vessel. When properly constituted and emplaced the gunning mixture is a relatively stiff pliable mass that adheres to the hot vessel lining and which quickly converts to a relatively hard non-pliable mass. As the temperature of the furnace rises during the next heat, components of the mixture more permanently bond the refractory grains to themselves and to the unevenly worn lining.
The granular refractory material used in gunning mixtures is typically composed of magnesia having a periclase crystalline phase. Such materials include dead burned natural magnesite and a synthetic periclase product derived from seawater or brine.
Because of their comparatively lower cost in the market, dead burned dolomite and/or chrome ore grog, along with dead burned magnesite in different combinations, have also been conventionally employed as refractory material in gunning mixtures. However, due to the lack of any bonding when wetted with water, refractories must additionally include a binder to provide at least temporary strength to the composition throughout its entire use temperature range (110 degrees Celsius to 1760 degrees Celsius). Optionally, a clay mineral may also be included in the mixture as a gelling or plasticizing agent.
Both organic and inorganic binders have been employed for use in gunning mixtures.
Representative organic binders have included starch, dextrin, various organic sulfonic acids and salts, and tars, pitches and resins, but all of these binders suffer a variety of drawbacks, which render them detrimental for use in gunning mixtures. For example, refractory mixtures containing organic sulfonic acids as a low temperature binder have been found to ignite and bum when applied between heats to the refractory brick lining of a hot (1200 degrees Celsius) metallurgical vessel, thereby compromising their ultimate utility. For the most part, organic additives contribute excessive porosity to the refractory composition thereby diminishing the repaired linings durability and strength.
Inorganic binders also pose problems when employed in gunning mixtures. Solid inorganic binders capable of being dissolved or dispersed in water have been in common use in gunning mixtures, and typical of these are chromic acid, sodium silicate, phosphate glasses, Epsom salts, and magnesium chloride. As with the organic additives, most of these binding agents suffer one or more disadvantages such as slowness of reaction or air setting, lack of strength at intermediate temperatures, poor slag resistance to name a few.
Silicates, phosphates and sulfates are generally the binders of choice for bonding magnesia-based refractory compositions, due primarily to their generally acceptable mechanical strength, slag resistance, and durability of the resultant products. Steel producers are constantly looking for compositions that will increase durability relative to current technology. This would decrease downtime and reduce the frequency of maintenance the metallurgical vessel requires for repair.
Therefore, what has been found to be new and novel is a refractory composition that improves upon the performance characteristics, such as hot strength, slag resistance, and overall durability, compared to current compositions being used to produce or repair refractory linings.
It is an objective of the present invention to provide a magnesia-sulfamic acid-calcia product having improved hot strength. Another objective of the present invention is to provide a magnesia-sulfamic acid-calcia refractory product exhibiting outstanding refractoriness i.e. this composition will not form deleterious low melting compounds that are formed when traditionally bonded compositions are used. A further objective of the present invention is to provide a magnesia-sulfamic acid-calcia refractory product outstanding in overall durability.
According to one aspect of the invention there is provided a refractory composition comprising:
(a) a magnesia based refractory material;
(b) sulfamic acid; and (c) calcium hydroxide in concentration between greater than 5.0 percent to 8.0 percent by weight of the total refractory composition.
According to a further aspect of the invention there is provided a refractory gunning composition comprising:
a) a magnesia-based refractory;
b) sulfamic acid;
c) calcium hydroxide in concentration between greater than 5.0 percent to 8.0 percent by weight of total refractory composition; and d) a wetting agent.
Additional objectives and features will become apparent from the following detailed description of the embodiments of the present invention.
This invention relates to refractory compositions. More particularly, this invention relates to magnesia-based refractory compositions useful in maintenance gunning of metallurgical vessels, in ramming mixtures, in castable refractories, and in basic refractory brick.
Most particularly this invention relates to refractory compositions, especially gunning mixtures, which are chemically adhered by means of a binder system having high temperature hot strength.
BACKGROUND OF THE INVENTION
In the production of steel, the refractory brick linings of conventional process vessels generally wear unevenly due to hot spots, slag attack, or other operating parameters. In the ongoing attempt to minimize production costs, a major concern of steel makers is the wearing of the refractory brick lining of the vessel and the resultant consumption of refractory composition to replace the lining. In order to extend the useful life of such linings, it has become acceptable practice to repair excessively worn areas between heats by means of gunning granular refractory compositions onto the brick surfaces. For example, a dry mixture including granular refractory grain is pneumatically delivered to a nozzle of a spray gun where it is mixed with water, resulting in a bonded composition that is projected against the irregularly worn surface, thereby filling in or patching the unevenly worn refractory lining with the refractory composition. Under the usual circumstances, gunning is initiated within minutes after the molten steel is tapped from the hot vessel. When properly constituted and emplaced the gunning mixture is a relatively stiff pliable mass that adheres to the hot vessel lining and which quickly converts to a relatively hard non-pliable mass. As the temperature of the furnace rises during the next heat, components of the mixture more permanently bond the refractory grains to themselves and to the unevenly worn lining.
The granular refractory material used in gunning mixtures is typically composed of magnesia having a periclase crystalline phase. Such materials include dead burned natural magnesite and a synthetic periclase product derived from seawater or brine.
Because of their comparatively lower cost in the market, dead burned dolomite and/or chrome ore grog, along with dead burned magnesite in different combinations, have also been conventionally employed as refractory material in gunning mixtures. However, due to the lack of any bonding when wetted with water, refractories must additionally include a binder to provide at least temporary strength to the composition throughout its entire use temperature range (110 degrees Celsius to 1760 degrees Celsius). Optionally, a clay mineral may also be included in the mixture as a gelling or plasticizing agent.
Both organic and inorganic binders have been employed for use in gunning mixtures.
Representative organic binders have included starch, dextrin, various organic sulfonic acids and salts, and tars, pitches and resins, but all of these binders suffer a variety of drawbacks, which render them detrimental for use in gunning mixtures. For example, refractory mixtures containing organic sulfonic acids as a low temperature binder have been found to ignite and bum when applied between heats to the refractory brick lining of a hot (1200 degrees Celsius) metallurgical vessel, thereby compromising their ultimate utility. For the most part, organic additives contribute excessive porosity to the refractory composition thereby diminishing the repaired linings durability and strength.
Inorganic binders also pose problems when employed in gunning mixtures. Solid inorganic binders capable of being dissolved or dispersed in water have been in common use in gunning mixtures, and typical of these are chromic acid, sodium silicate, phosphate glasses, Epsom salts, and magnesium chloride. As with the organic additives, most of these binding agents suffer one or more disadvantages such as slowness of reaction or air setting, lack of strength at intermediate temperatures, poor slag resistance to name a few.
Silicates, phosphates and sulfates are generally the binders of choice for bonding magnesia-based refractory compositions, due primarily to their generally acceptable mechanical strength, slag resistance, and durability of the resultant products. Steel producers are constantly looking for compositions that will increase durability relative to current technology. This would decrease downtime and reduce the frequency of maintenance the metallurgical vessel requires for repair.
Therefore, what has been found to be new and novel is a refractory composition that improves upon the performance characteristics, such as hot strength, slag resistance, and overall durability, compared to current compositions being used to produce or repair refractory linings.
It is an objective of the present invention to provide a magnesia-sulfamic acid-calcia product having improved hot strength. Another objective of the present invention is to provide a magnesia-sulfamic acid-calcia refractory product exhibiting outstanding refractoriness i.e. this composition will not form deleterious low melting compounds that are formed when traditionally bonded compositions are used. A further objective of the present invention is to provide a magnesia-sulfamic acid-calcia refractory product outstanding in overall durability.
According to one aspect of the invention there is provided a refractory composition comprising:
(a) a magnesia based refractory material;
(b) sulfamic acid; and (c) calcium hydroxide in concentration between greater than 5.0 percent to 8.0 percent by weight of the total refractory composition.
According to a further aspect of the invention there is provided a refractory gunning composition comprising:
a) a magnesia-based refractory;
b) sulfamic acid;
c) calcium hydroxide in concentration between greater than 5.0 percent to 8.0 percent by weight of total refractory composition; and d) a wetting agent.
Additional objectives and features will become apparent from the following detailed description of the embodiments of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a graph comparing the 1370 degrees Celsius hot breaking strength of two high purity magnesia refractory compositions that are currently used for repairing refractory linings, with the hot breaking strength of the present invention.
Fire 2 is a graph comparing the 1510 degrees Celsius hot breaking strength of two high purity magnesia refractory compositions that are currently used for repairing refractory linings, with the hot breaking strength of the present invention.
4a SUMMARY OF THE INVENTION
The present invention provides a magnesia-sulfamic acid-calcia refractory composition that includes from about 87.0 percent to about 98.0 percent by weight of the total composition magnesia-based refractory material, from about 1.0 percent to about 5.0 percent by weight of the total composition sulfamic acid and from about 1.0 percent to about 8.0 percent by weight of the total composition calcium hydroxide.
Another aspect of the present invention provides a magnesia-sulfamic acid-calcia refractory composition that includes from about 91.0 percent to about 95.0 percent by weight of the total composition magnesia-based refractory material, from about 2.0 percent to about 4.0 percent by weight of the total composition sulfamic acid and from about 3.0 percent to about 5.0 percent by weight of the total composition calcium hydroxide.
A further aspect of the present invention provides a magnesia-sulfamic acid-calcia refractory composition that includes from about 92.0 percent to about 94.0 percent by weight of the total composition magnesia-based refractory material, from about 2.5 percent to about 3.5 percent by weight of the total composition sulfamic acid and from about 3.5 percent to about 4.5 percent by weight of the total composition calcium hydroxide.
In still a further aspect of the present invention provides a magnesia-sulfamic acid-calcia refractory composition that includes from about 92.0 percent to about 94.0 percent by weight of the total composition magnesia-based refractory material, from about 2.5 percent to about 3.5 percent by weight of the total composition sulfamic acid and from about 3.5 percent to about 4.5 percent by weight of the total composition calcium hydroxide, and, optionally a wetting agent from about 0.05 percent to about 0.5 percent by weight of the total composition may also be added.
In order to improve existing refractory repair compositions extensive research was done in an effort to find a refractory composition that would improve hot strength and overall durability. It was found when a combination of sulfamic acid and calcium hydroxide is added to a magnesia-based refractory material, a refractory lining is produced having greater durability and hot strength than currently used compositions. When the refractory composition of the present invention is used in gunning applications, a wetting agent may additionally be added to the composition.
DETAILED DESCRIPTION OF THE INVENTION
A magnesia based refractory material is admixed with sulfamic acid and an independent calcia source such as calcium hydroxide and/or calcium oxide. It was discovered that the use of sulfamic acid in combination with calcium hydroxide and/or calcium oxide results in a magnesia based refractory composition, having improved physical properties, at temperatures from about 110 degrees Celsius to about 1760 degrees Celsius over compositions currently used for production or repair of refractory furnace linings.
Figure 1 is a graph comparing the 1370 degrees Celsius hot breaking strength of two high purity magnesia refractory compositions that are currently used for repairing refractory linings, with the hot breaking strength of the present invention.
Fire 2 is a graph comparing the 1510 degrees Celsius hot breaking strength of two high purity magnesia refractory compositions that are currently used for repairing refractory linings, with the hot breaking strength of the present invention.
4a SUMMARY OF THE INVENTION
The present invention provides a magnesia-sulfamic acid-calcia refractory composition that includes from about 87.0 percent to about 98.0 percent by weight of the total composition magnesia-based refractory material, from about 1.0 percent to about 5.0 percent by weight of the total composition sulfamic acid and from about 1.0 percent to about 8.0 percent by weight of the total composition calcium hydroxide.
Another aspect of the present invention provides a magnesia-sulfamic acid-calcia refractory composition that includes from about 91.0 percent to about 95.0 percent by weight of the total composition magnesia-based refractory material, from about 2.0 percent to about 4.0 percent by weight of the total composition sulfamic acid and from about 3.0 percent to about 5.0 percent by weight of the total composition calcium hydroxide.
A further aspect of the present invention provides a magnesia-sulfamic acid-calcia refractory composition that includes from about 92.0 percent to about 94.0 percent by weight of the total composition magnesia-based refractory material, from about 2.5 percent to about 3.5 percent by weight of the total composition sulfamic acid and from about 3.5 percent to about 4.5 percent by weight of the total composition calcium hydroxide.
In still a further aspect of the present invention provides a magnesia-sulfamic acid-calcia refractory composition that includes from about 92.0 percent to about 94.0 percent by weight of the total composition magnesia-based refractory material, from about 2.5 percent to about 3.5 percent by weight of the total composition sulfamic acid and from about 3.5 percent to about 4.5 percent by weight of the total composition calcium hydroxide, and, optionally a wetting agent from about 0.05 percent to about 0.5 percent by weight of the total composition may also be added.
In order to improve existing refractory repair compositions extensive research was done in an effort to find a refractory composition that would improve hot strength and overall durability. It was found when a combination of sulfamic acid and calcium hydroxide is added to a magnesia-based refractory material, a refractory lining is produced having greater durability and hot strength than currently used compositions. When the refractory composition of the present invention is used in gunning applications, a wetting agent may additionally be added to the composition.
DETAILED DESCRIPTION OF THE INVENTION
A magnesia based refractory material is admixed with sulfamic acid and an independent calcia source such as calcium hydroxide and/or calcium oxide. It was discovered that the use of sulfamic acid in combination with calcium hydroxide and/or calcium oxide results in a magnesia based refractory composition, having improved physical properties, at temperatures from about 110 degrees Celsius to about 1760 degrees Celsius over compositions currently used for production or repair of refractory furnace linings.
In one embodiment, the refractory composition of the present invention is a magnesia based refractory material in combination with sulfamic acid and calcia.
In another embodiment, the refractory composition of the present invention is a gunning composition of a magnesia based refractory material in combination with sulfamic acid, calcia and a wetting agent. The wetting agent may be any suitable dispersant, superplasticizer, anionic, cationic or nonionic surfactant, the selection of which for any particular composition would be understood by one of ordinary skill in the art of refractories.
In another embodiment the calcia is calcium oxide.
In another embodiment the calcia is calcium hydroxide.
In another embodiment the wetting agent is selected from the group consisting of a sulfonated naphthalene condensate, polycarboxylic ether and maleic acid copolymer superplasticizer.
In another embodiment the wetting agent is a sulfonated naphthalene condensate superplasticizer.
In another embodiment, the calcium hydroxide and/or calcium oxide concentration is from about 1.0 percent to about 8.0 percent by weight of the total refractory composition.
In another embodiment, the calcium hydroxide and/or calcium oxide concentration is from about 2.0 percent to about 4.0 percent by weight of the total refractory composition.
In another embodiment, the calcium hydroxide and/or calcium oxide concentration is from about 3.5 percent to about 4.5 percent by weight of the total refractory composition.
In another embodiment the sulfamic acid is from about 1.0 percent by weight to about 8.0 percent by weight of the total refractory composition.
In another embodiment the sulfamic acid is from about 3.0 percent by weight to about 5.0 percent by weight of the total refractory composition.
In another embodiment the sulfamic acid is from about 2.5 percent by weight to about 3.5 percent by weight of the total refractory composition.
In another embodiment the composition is a magnesia-based refractory composition for use in the production or repair of metallurgical furnace linings from about 1.0 percent by weight to about 5.0 percent by weight of the refractory composition is sulfamic acid; and from about 1.0 percent by weight to about 8.0 percent by weight of the refractory composition is calcium hydroxide.
In another embodiment, the refractory composition of the present invention is a gunning composition of a magnesia based refractory material in combination with sulfamic acid, calcia and a wetting agent. The wetting agent may be any suitable dispersant, superplasticizer, anionic, cationic or nonionic surfactant, the selection of which for any particular composition would be understood by one of ordinary skill in the art of refractories.
In another embodiment the calcia is calcium oxide.
In another embodiment the calcia is calcium hydroxide.
In another embodiment the wetting agent is selected from the group consisting of a sulfonated naphthalene condensate, polycarboxylic ether and maleic acid copolymer superplasticizer.
In another embodiment the wetting agent is a sulfonated naphthalene condensate superplasticizer.
In another embodiment, the calcium hydroxide and/or calcium oxide concentration is from about 1.0 percent to about 8.0 percent by weight of the total refractory composition.
In another embodiment, the calcium hydroxide and/or calcium oxide concentration is from about 2.0 percent to about 4.0 percent by weight of the total refractory composition.
In another embodiment, the calcium hydroxide and/or calcium oxide concentration is from about 3.5 percent to about 4.5 percent by weight of the total refractory composition.
In another embodiment the sulfamic acid is from about 1.0 percent by weight to about 8.0 percent by weight of the total refractory composition.
In another embodiment the sulfamic acid is from about 3.0 percent by weight to about 5.0 percent by weight of the total refractory composition.
In another embodiment the sulfamic acid is from about 2.5 percent by weight to about 3.5 percent by weight of the total refractory composition.
In another embodiment the composition is a magnesia-based refractory composition for use in the production or repair of metallurgical furnace linings from about 1.0 percent by weight to about 5.0 percent by weight of the refractory composition is sulfamic acid; and from about 1.0 percent by weight to about 8.0 percent by weight of the refractory composition is calcium hydroxide.
In another embodiment the composition is a magnesia-based refractory composition for use in the production or repair of metallurgical furnace linings is from about 2 percent to about 4 percent by weight of the refractory composition is sulfamic acid; and from about 3 percent to about 5 percent by weight of the refractory composition is calcium hydroxide.
In another embodiment the composition is a magnesia-based refractory composition for use in the production or repair of metallurgical furnace linings from about 2.5 percent by weight to about 3.5 percent by weight of the refractory composition is sulfamic acid; and from about 3.5 percent by weight to about 4.5 percent by weight of the refractory composition is calcium hydroxide.
In another embodiment the composition is a magnesia-based refractory composition for use in the production or repair of metallurgical furnace linings from about 1.0 percent by weight to about 5.0 percent by weight of the refractory composition is sulfamic acid; and from about 1.0 percent by weight to about 8.0 percent by weight of the refractory composition is calcium oxide.
In another embodiment the composition is a magnesia-based refractory composition for use in the production or repair of metallurgical furnace linings is from about 2 percent to about 4 percent by weight of the refractory composition is sulfamic acid; and from about 3 percent to about 5 percent by weight of the refractory composition is calcium oxide.
?0 In another embodiment the composition is a magnesia-based refractory composition for use in the production or repair of metallurgical furnace linings from about 2.5 percent by weight to about 3.5 percent by weight of the refractory composition is sulfamic acid; and from about 3.5 percent by weight to about 4.5 percent by weight of the refractory composition is calcium oxide.
In another embodiment the composition is a magnesia-based refractory gunning composition for use in the production or repair of metallurgical furnace linings wherein from about 1.0 percent by weight to about 5.0 percent by weight of the gunning composition is sulfamic acid; and 1.0 percent to about 8.0 percent by weight of the gunning composition is calcium hydroxide; and from about 0.05 percent to about 0.5 percent by weight of the gunning composition is a wetting agent.
to In another embodiment the composition is a magnesia-based refractory gunning composition for use in the production or repair of metallurgical furnace linings wherein from about 2.0 percent by weight to about 4.0 percent by weight of the gunning composition is sulfamic acid; and 3.0 percent to about 5.0 percent by weight of the gunning composition is calcium hydroxide; and from about 0.05 percent to about 0.5 percent by weight of the gunning composition is a wetting agent.
In another embodiment the composition is a magnesia-based refractory gunning composition for use in the production or repair of metallurgical furnace linings wherein from about 2.5 percent by weight to about 3.5 percent by weight of the gunning composition is sulfamic acid; and 3.5 percent to about 4.5 percent by weight of the gunning composition is calcium hydroxide; and from Z0 about 0.05 percent to about 0.5 percent by weight of the gunning composition is a wetting agent.
In another embodiment the composition is a magnesia-based refractory gunning composition for use in the production or repair of metallurgical furnace linings wherein from about 1.0 percent by weight to about 5.0 percent by weight of the gunning composition is sulfamic acid; and 1.0 percent to about 8.0 percent by weight of the gunning composition is calcium oxide; and from about 0.05 percent to about 0.5 percent by weight of the gunning composition is a wetting agent.
In another embodiment the composition is a magnesia-based refractory gunning composition for use in the production or repair of metallurgical furnace linings wherein from about 2.0 percent by weight to about 4.0 percent by weight of the gunning composition is sulfamic acid; and 3.0 percent to about 5.0 percent by weight of the gunning composition is calcium oxide; and from about 0.05 percent to about 0.5 percent by weight of the gunning composition is a wetting agent.
In another embodiment the composition is a magnesia-based refractory gunning composition for use in the production or repair of metallurgical furnace linings wherein from about 2.5 percent by weight to about 3.5 percent by weight of the gunning composition is sulfamic acid; and 3.5 percent to about 4.5 percent by weight of the gunning composition is calcium oxide; and from about 0.05 percent to about 0.5 percent by weight of the gunning composition is a wetting agent.
In another embodiment a monolithic refractory lining is formed on a metallurgical vessel by gunning onto at least a portion of the inside surface of the vessel, a magnesia-based refractory composition containing sulfamic acid, calcia and a wetting agent.
The following non-limiting examples are merely illustrative of some embodiments of the present invention, and are not to be construed as limiting the invention, the scope of which is defined by the appended claims.
Four high purity magnesia refractory compositions were tested to determine high-temperature modulus of rupture in an oxidizing atmosphere and under action of a force or stress that is increased at a constant rate using the "Standard Test Method for Modulus Rupture of Refractory Materials at Elevated Temperatures" as defined under ASTM Designation C 583-80 (Reapproved 1995), except a three hour soak time was employed and two inch by two inch by nine inch test samples were used.
Four refractory compositions were compared to determine hot strength or modulus of rupture at 1370 degrees Celsius and 1510 degrees Celsius. Two compositions produced in accordance with the present invention, Sample 1 with wetting agent and Sample 2 without wetting agent, both of which are a high purity magnesia material that is bonded with a combination of sulfamic acid and calcium hydroxide, were compared to Sample 3, which is a premium quality, high purity magnesia, silicate bonded refractory gunning product and Sam lp e 4, which is a high purity magnesia, sulfamic acid bonded refractory gunning product. The results are shown in Figure 1 and Figure 2.
The 1370 degrees Celsius Hot Modulus of Rupture result show that the compositions made in accordance with the present invention have higher Hot Modulus of Rupture Strength compared with traditional silicate and sulfamic acid bonded refractory compositions.
The 1510 degrees Celsius Hot Modulus of Rupture result show that the compositions made in accordance with the present invention have higher Hot Modulus of Rupture Strength compared with traditional silicate and sulfamic acid bonded refractory compositions.
Other embodiments of the invention will be apparent to those skilled in the art from a consideration of this specification or practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope of the invention being defined by the following claims.
In another embodiment the composition is a magnesia-based refractory composition for use in the production or repair of metallurgical furnace linings from about 2.5 percent by weight to about 3.5 percent by weight of the refractory composition is sulfamic acid; and from about 3.5 percent by weight to about 4.5 percent by weight of the refractory composition is calcium hydroxide.
In another embodiment the composition is a magnesia-based refractory composition for use in the production or repair of metallurgical furnace linings from about 1.0 percent by weight to about 5.0 percent by weight of the refractory composition is sulfamic acid; and from about 1.0 percent by weight to about 8.0 percent by weight of the refractory composition is calcium oxide.
In another embodiment the composition is a magnesia-based refractory composition for use in the production or repair of metallurgical furnace linings is from about 2 percent to about 4 percent by weight of the refractory composition is sulfamic acid; and from about 3 percent to about 5 percent by weight of the refractory composition is calcium oxide.
?0 In another embodiment the composition is a magnesia-based refractory composition for use in the production or repair of metallurgical furnace linings from about 2.5 percent by weight to about 3.5 percent by weight of the refractory composition is sulfamic acid; and from about 3.5 percent by weight to about 4.5 percent by weight of the refractory composition is calcium oxide.
In another embodiment the composition is a magnesia-based refractory gunning composition for use in the production or repair of metallurgical furnace linings wherein from about 1.0 percent by weight to about 5.0 percent by weight of the gunning composition is sulfamic acid; and 1.0 percent to about 8.0 percent by weight of the gunning composition is calcium hydroxide; and from about 0.05 percent to about 0.5 percent by weight of the gunning composition is a wetting agent.
to In another embodiment the composition is a magnesia-based refractory gunning composition for use in the production or repair of metallurgical furnace linings wherein from about 2.0 percent by weight to about 4.0 percent by weight of the gunning composition is sulfamic acid; and 3.0 percent to about 5.0 percent by weight of the gunning composition is calcium hydroxide; and from about 0.05 percent to about 0.5 percent by weight of the gunning composition is a wetting agent.
In another embodiment the composition is a magnesia-based refractory gunning composition for use in the production or repair of metallurgical furnace linings wherein from about 2.5 percent by weight to about 3.5 percent by weight of the gunning composition is sulfamic acid; and 3.5 percent to about 4.5 percent by weight of the gunning composition is calcium hydroxide; and from Z0 about 0.05 percent to about 0.5 percent by weight of the gunning composition is a wetting agent.
In another embodiment the composition is a magnesia-based refractory gunning composition for use in the production or repair of metallurgical furnace linings wherein from about 1.0 percent by weight to about 5.0 percent by weight of the gunning composition is sulfamic acid; and 1.0 percent to about 8.0 percent by weight of the gunning composition is calcium oxide; and from about 0.05 percent to about 0.5 percent by weight of the gunning composition is a wetting agent.
In another embodiment the composition is a magnesia-based refractory gunning composition for use in the production or repair of metallurgical furnace linings wherein from about 2.0 percent by weight to about 4.0 percent by weight of the gunning composition is sulfamic acid; and 3.0 percent to about 5.0 percent by weight of the gunning composition is calcium oxide; and from about 0.05 percent to about 0.5 percent by weight of the gunning composition is a wetting agent.
In another embodiment the composition is a magnesia-based refractory gunning composition for use in the production or repair of metallurgical furnace linings wherein from about 2.5 percent by weight to about 3.5 percent by weight of the gunning composition is sulfamic acid; and 3.5 percent to about 4.5 percent by weight of the gunning composition is calcium oxide; and from about 0.05 percent to about 0.5 percent by weight of the gunning composition is a wetting agent.
In another embodiment a monolithic refractory lining is formed on a metallurgical vessel by gunning onto at least a portion of the inside surface of the vessel, a magnesia-based refractory composition containing sulfamic acid, calcia and a wetting agent.
The following non-limiting examples are merely illustrative of some embodiments of the present invention, and are not to be construed as limiting the invention, the scope of which is defined by the appended claims.
Four high purity magnesia refractory compositions were tested to determine high-temperature modulus of rupture in an oxidizing atmosphere and under action of a force or stress that is increased at a constant rate using the "Standard Test Method for Modulus Rupture of Refractory Materials at Elevated Temperatures" as defined under ASTM Designation C 583-80 (Reapproved 1995), except a three hour soak time was employed and two inch by two inch by nine inch test samples were used.
Four refractory compositions were compared to determine hot strength or modulus of rupture at 1370 degrees Celsius and 1510 degrees Celsius. Two compositions produced in accordance with the present invention, Sample 1 with wetting agent and Sample 2 without wetting agent, both of which are a high purity magnesia material that is bonded with a combination of sulfamic acid and calcium hydroxide, were compared to Sample 3, which is a premium quality, high purity magnesia, silicate bonded refractory gunning product and Sam lp e 4, which is a high purity magnesia, sulfamic acid bonded refractory gunning product. The results are shown in Figure 1 and Figure 2.
The 1370 degrees Celsius Hot Modulus of Rupture result show that the compositions made in accordance with the present invention have higher Hot Modulus of Rupture Strength compared with traditional silicate and sulfamic acid bonded refractory compositions.
The 1510 degrees Celsius Hot Modulus of Rupture result show that the compositions made in accordance with the present invention have higher Hot Modulus of Rupture Strength compared with traditional silicate and sulfamic acid bonded refractory compositions.
Other embodiments of the invention will be apparent to those skilled in the art from a consideration of this specification or practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope of the invention being defined by the following claims.
Claims (13)
1. A refractory composition comprising:
(a) a magnesia based refractory material;
(b) sulfamic acid; and (c) calcium hydroxide in concentration between greater than 5.0 percent to 8.0 percent by weight of the total refractory composition.
(a) a magnesia based refractory material;
(b) sulfamic acid; and (c) calcium hydroxide in concentration between greater than 5.0 percent to 8.0 percent by weight of the total refractory composition.
2. The refractory composition of claim 1, wherein the calcium hydroxide concentration is between greater than 5.0 percent to about 7.0 percent by weight of the total refractory composition.
3. The refractory composition of 2, wherein the calcium hydroxide concentration is between 5.5 percent to about 6.5 percent by weight of the total refractory composition.
4. The refractory composition of any one of claims 1 to 3, further comprising calcium oxide in concentration between about 0.5 percent to about 1.0 percent by weight of the total refractory composition.
5. The refractory composition of any one of claims 1 to 4, wherein the sulfamic acid is from about 1.0 percent by weight to about 5.0 percent by weight of the total refractory composition.
6. The refractory composition claim 5, wherein the sulfamic acid is from about 2.0 percent by weight to about 4.0 percent by weight of the total refractory composition.
7. The refractory composition of claim 6, wherein the sulfamic acid is from about 2.5 percent by weight to about 3.5 percent by weight of the total refractory composition.
8. A refractory gunning composition comprising:
a) a magnesia-based refractory;
b) sulfamic acid;
c) calcium hydroxide in concentration between greater than 5.0 percent to 8.0 percent by weight of total refractory composition; and d) a wetting agent.
a) a magnesia-based refractory;
b) sulfamic acid;
c) calcium hydroxide in concentration between greater than 5.0 percent to 8.0 percent by weight of total refractory composition; and d) a wetting agent.
9. The gunning composition according to claim 8, wherein the sulfamic acid concentration is from about 1.0 percent to about 5.0 percent by weight of the gunning composition;
the wetting agent concentration is from about 0.05 percent to about 0.5 percent by weight of the gunning composition; and further comprising calcium oxide in concentration from about 0.5 percent to about 1.0 percent by weight of the total refractory composition.
the wetting agent concentration is from about 0.05 percent to about 0.5 percent by weight of the gunning composition; and further comprising calcium oxide in concentration from about 0.5 percent to about 1.0 percent by weight of the total refractory composition.
10. The gunning composition according to claim 8 or 9, wherein the sulfamic acid concentration is from about 2.0 percent to about 4.0 percent by weight of the gunning composition.
11. The gunning composition according to claim 10, wherein the sulfamic acid concentration is from about 2.5 percent to about 3.5 percent by weight of the gunning composition.
12. The gunning composition according to any one of claims 8 to 11, wherein the calcium hydroxide concentration is from greater than 5.0 percent to about 7.0 percent by weight of the total refractory composition.
13. The gunning composition according to claim 12, wherein the calcium hydroxide concentration is between 5.5 percent to about 6.5 percent by weight of the total refractory composition.
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| US10/783,514 | 2004-07-12 | ||
| US10/783,514 US7078360B2 (en) | 2004-07-12 | 2004-07-12 | High durability refractory composition |
| PCT/US2004/032154 WO2006016887A1 (en) | 2004-07-12 | 2004-10-01 | High durability refractory composition |
Publications (2)
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| CA2573278A1 CA2573278A1 (en) | 2006-02-16 |
| CA2573278C true CA2573278C (en) | 2011-11-29 |
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| US (1) | US7078360B2 (en) |
| EP (1) | EP1765744B1 (en) |
| JP (1) | JP5324092B2 (en) |
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| DE102007032892B4 (en) * | 2007-07-14 | 2009-12-24 | Refractory Intellectual Property Gmbh & Co. Kg | Tundish mass and a method for creating a humid Tundishmasse |
| US8747546B2 (en) * | 2007-08-17 | 2014-06-10 | Specialty Minerals (Michigan) Inc. | Calcium enriched refractory material by the addition of calcium carbonate |
| ES2506097T3 (en) * | 2007-08-17 | 2014-10-13 | Specialty Minerals (Michigan) Inc. | Refractory material enriched in calcium by the addition of a calcium carbonate |
| CN103109149B (en) * | 2010-05-20 | 2015-04-01 | 新日铁住金株式会社 | Heat treatment furnace for metal chunk, method for repairing heat treatment furnace for metal chunk, and method for producing infill for hearth used for heat treatment furnace for metal chunk |
| DE202013011886U1 (en) | 2013-06-28 | 2014-09-03 | Refratechnik Holding Gmbh | Refractory product |
| US20170341983A1 (en) | 2016-05-24 | 2017-11-30 | Specialty Minerals (Michigan) Inc. | Liquid Flow Aid for Dry Gunnables |
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|---|---|---|---|---|
| US3971665A (en) * | 1974-03-18 | 1976-07-27 | Nissan Chemical Industries, Ltd. | Refractory compositions |
| US4383045A (en) * | 1982-04-27 | 1983-05-10 | Martin Marietta Corp. | Magnesia refractories bonded with sulfamic acid |
| EP0119812B1 (en) | 1983-03-18 | 1992-02-05 | Quigley Company Inc. | Monolithic refractory composition |
| JPS62148377A (en) * | 1985-12-23 | 1987-07-02 | 品川白煉瓦株式会社 | Quick-set spray refractory composition |
| JPH01278469A (en) * | 1988-04-28 | 1989-11-08 | Kawasaki Refract Co Ltd | Magnesia-calcia based refractory |
| JPH03170363A (en) | 1989-11-27 | 1991-07-23 | Kawasaki Refract Co Ltd | Magnesia-calcia-based refractory |
| JP2751968B2 (en) | 1990-05-12 | 1998-05-18 | 日新製鋼株式会社 | Basic amorphous refractories |
| JPH0688840B2 (en) | 1992-04-09 | 1994-11-09 | 品川白煉瓦株式会社 | Room temperature curable amorphous refractory |
| US5507474A (en) * | 1994-01-13 | 1996-04-16 | Minerals Technologies, Inc. | Lining for molten metal handling vessles |
| JPH0940470A (en) * | 1995-07-28 | 1997-02-10 | Harima Ceramic Co Ltd | Basic prepared unshaped refractory |
| JPH09165271A (en) * | 1995-12-15 | 1997-06-24 | Harima Ceramic Co Ltd | Basic spraying material |
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2004
- 2004-07-12 US US10/783,514 patent/US7078360B2/en active Active
- 2004-10-01 RU RU2007105098/03A patent/RU2007105098A/en not_active Application Discontinuation
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- 2004-10-01 CN CN2004800438256A patent/CN101006030B/en not_active Expired - Fee Related
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| ES2322062T3 (en) | 2009-06-16 |
| ZA200700356B (en) | 2008-07-30 |
| ATE427293T1 (en) | 2009-04-15 |
| MX2007000419A (en) | 2007-03-12 |
| WO2006016887A1 (en) | 2006-02-16 |
| CN101006030B (en) | 2010-04-21 |
| EP1765744A1 (en) | 2007-03-28 |
| RU2007105098A (en) | 2008-08-20 |
| AR047631A1 (en) | 2006-02-01 |
| US7078360B2 (en) | 2006-07-18 |
| AU2004322280A1 (en) | 2006-02-16 |
| KR20050083010A (en) | 2005-08-24 |
| US20060009346A1 (en) | 2006-01-12 |
| JP5324092B2 (en) | 2013-10-23 |
| CN101006030A (en) | 2007-07-25 |
| BRPI0418945A (en) | 2007-12-04 |
| PL1765744T3 (en) | 2009-08-31 |
| EP1765744B1 (en) | 2009-04-01 |
| JP2008505839A (en) | 2008-02-28 |
| TW200602468A (en) | 2006-01-16 |
| DE602004020395D1 (en) | 2009-05-14 |
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