Reactive Furnace Lining Patents (Class 75/301)
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Patent number: 8569191Abstract: The disclosure relates to a refractory which is resistant to corrosion which degrades the refractory during titanium-ore beneficiation in a furnace, particularly a rotary hearth furnace. In particular, the disclosure relates to a layered refractory lining for a furnace, for use in a titanium ore beneficiation process wherein a titanium oxide-rich molten slag is formed, comprising: (a) a first layer comprising a major proportion of alumina and a minor proportion of zirconia; (b) a second layer comprising a resistant agent for the molten slag; wherein the second layer is between the slag and the first layer.Type: GrantFiled: May 5, 2010Date of Patent: October 29, 2013Assignee: E I du Pont de Nemours and CompanyInventors: John James Barnes, Dat Nguyen, Peter Hill, Jay Scott Schickling
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Patent number: 8197566Abstract: Embodiments disclosed herein provide hydrocarbon additives and methods of making and using the same. The additives are suitable for use in conjunction with gasifiers, furnaces, or other high-temperature vessels. The additives may be part of an input stream to a reaction vessel of a hydrocarbon gasifier. The additives may include materials that at least partially reduce the infiltration of slag into the refractory material.Type: GrantFiled: December 8, 2008Date of Patent: June 12, 2012Assignee: General Electric CompanyInventors: Peter Joel Meschter, Paul Stephen Dimascio
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Patent number: 8105683Abstract: A treated refractory material includes a sintered porous refractory material having one or more protective materials disposed within pores of the refractory material, wherein the protective material is selected from the group consisting of aluminum oxide, chromium oxide, silica, rare earth oxides, rare earth zirconates, titanium oxide, mullite, zirconium oxide, zirconium silicate, yttrium oxide, magnesium oxide, iron oxide, and blends thereof. Methods of preparing the treated refractory material are also provided. The treated refractory material provides protection from the penetration of slag and extends the service life of the refractory.Type: GrantFiled: March 7, 2007Date of Patent: January 31, 2012Assignee: General Electric CompanyInventors: Anthony Mark Thompson, Roman Shuba, Peter Joel Meschter, Krishan Lal Luthra, Vikas Behrani
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Calcium aluminate clinker as a refractory aggregate with and without barium addition and use thereof
Patent number: 7824464Abstract: The present invention provides for a refractory aggregate composition comprising an improved calcium aluminate clinker having the formula CnAx wherein C is calcium oxide and A is aluminum oxide, wherein n is an integer from about 1 to about 12, wherein x is an integer from about 1 to about 24, and wherein said clinker has from zero to less than about fifty weight percent C12A7. Analogs, derivatives and hydrates of the improved calcium aluminate clinker are provided. A refractory composition and a sprayable refractory composition are disclosed comprising the improved calcium aluminate clinker. A method for improving the insulating character and/or penetration resistance of a liner in contact with molten aluminum in an aluminum manufacturing process or during aluminum transport is provided.Type: GrantFiled: September 4, 2007Date of Patent: November 2, 2010Inventor: Kenneth A. McGowan -
Publication number: 20090188347Abstract: A treated refractory material includes a refractory material having a plurality of pores, wherein the refractory material comprises aluminum oxide, silicon oxide, magnesium oxide, chromium oxide, zirconium oxide, titanium oxide, calcium oxide, fireclay, silicon carbide, tungsten, mullite, dolomite, magnesite, magnesium aluminum oxide, chromite, magnetite, or a combination comprising at least one of the foregoing; and a protective material disposed within the plurality of pores of the refractory material, wherein the protective material is selected from the group consisting of aluminum oxide, chromium oxide, silica, rare earth oxides, rare earth zirconates, titanium oxide, mullite, zirconium oxide, zirconium silicate, yttrium oxide, magnesium oxide, iron oxide, and blends thereof.Type: ApplicationFiled: January 26, 2009Publication date: July 30, 2009Applicant: General Electric CompanyInventors: Wade Albert Taber, Wei Chen, Peter Joel Meschter, Roman Shuba
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Publication number: 20080216603Abstract: A treated refractory material includes a sintered porous refractory material having one or more protective materials disposed within pores of the refractory material, wherein the protective material is selected from the group consisting of aluminum oxide, chromium oxide, silica, rare earth oxides, rare earth zirconates, titanium oxide, mullite, zirconium oxide, zirconium silicate, yttrium oxide, magnesium oxide, iron oxide, and blends thereof. Methods of preparing the treated refractory material are also provided. The treated refractory material provides protection from the penetration of slag and extends the service life of the refractory.Type: ApplicationFiled: March 7, 2007Publication date: September 11, 2008Inventors: Anthony Mark Thompson, Roman Shuba, Peter Joel Meschter, Krishan Lal Luthra, Vikas Behrani
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Publication number: 20040159184Abstract: Methods and compositions for inhibiting corrosion of metal surfaces in a furnace system are disclosed. In one aspect of the invention, pulverized coal is burned as fuel in the presence of a copper ion catalyst/combustion aid. Corrosion is inhibited in these systems by the use of a blend of primary aminoalcohol such as 2-aminoethanol, tertiary aminoalcohol such as triethanol amine, and boric acid or water soluble salt form of the acid.Type: ApplicationFiled: February 19, 2003Publication date: August 19, 2004Applicant: General Electric CompanyInventors: Nicholas Robert Blandford, Libardo A. Perez
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Patent number: 6454831Abstract: A fine-grained product with a grain size of 100%<5 mm is obtained during the production of titanium dioxide in the chloride method in which titanium-containing raw material is reacted with gaseous chlorine in the presence of a carbon-rich substance, preferably coal and/or coke, in a chlorination reactor, preferably with a fluidized bed, to form titanium tetrachloride, the fine-grained product consisting, in the dried state, of the main constituents TiO2, coal and SiO2, mixed with filter salt (iron sulfate that is obtained during dilute acid recovery), residues containing TiO2 from TiO2-production according to the sulfate method, coal, sulfur, and ilmenite/TiO2-slag. This mixture is treated in a fluidized bed furnace or rotating tubular furnace at temperatures of 900 to 1,300° C. The mixture is used as a flux for the purpose of improving the durability of the brick lining of a furnace for the smelting-metallurgical production of metallic materials.Type: GrantFiled: April 13, 2001Date of Patent: September 24, 2002Assignee: Metallgesellschaft AGInventors: Djamschid Amirzadeh-Asl, Wolfgang Roder, Wolf-Dieter Griebler
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Patent number: 6132574Abstract: A bottom lining for electrolytic cells formed from steel pots for use in primary production and secondary refining, made from a monolithic stamping of a finely granulated powder having a high alumina content, and a process for producing same. The powder is obtained from aluminum industrial scrap recovery and salt slags and has the following components in the following amounts based on dried weight:______________________________________ Al.sub.2 O.sub.3 40-90% AlN 0.1-25% MgO 4-20% SiO.sub.2 0.5-15% CaO 0.1-15% Al (metallic) 0.1-10% Si (metallic) 0.1-10% Fe.sub.2 O.sub.3 0.1-5% C not more than 5% F not more than 5% Na.sub.2 O 0.1-5% K.sub.2 O 0.1-2% TiO.sub.2 0.1-2% Others not more than 5% Loss on ignition not more than 10%.Type: GrantFiled: May 27, 1998Date of Patent: October 17, 2000Assignee: Aluminium-Salzschalcke Aufbereitungs GmbHInventors: Reinhard Feige, Gerhard Merker
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Patent number: 6008152Abstract: The invention concerns a refractory material comprised essentially of vitreous or amorphous silica and presenting an improved resistance to corrosion by molten metals, principally aluminium. It contains at least 0.1% and no more than 10% by wt. of barium sulfate. It has a crystallized silica content of less than 10% and it is comprised of at least 75% vitreous or amorphous silica.Type: GrantFiled: May 14, 1998Date of Patent: December 28, 1999Assignee: Vesuvius Crucible CompanyInventors: Philippe Guillo, Mike Hankin
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Patent number: 5833881Abstract: A stable aqueous solution comprising a water soluble salt of a magnesium compound, a surfactant and a calcium salt inhibitor is used to reduce deposits in kilns or furnaces used to make iron ore agglomerates, known as pellets, during iron ore calcination.Type: GrantFiled: April 22, 1997Date of Patent: November 10, 1998Assignee: BetzDearborn Inc.Inventor: Donald C. Roe
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Patent number: 5656062Abstract: A stable aqueous solution comprising a water soluble salt of a magnesium compound is used to reduce deposits in kilns or furnaces used to make iron ore agglomerates, known as pellets, during iron ore calcination.Type: GrantFiled: May 31, 1995Date of Patent: August 12, 1997Assignee: BetzDearborn Inc.Inventor: Donald C. Roe
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Patent number: 5646079Abstract: The present invention pertains to an electrically conductive, dry, refractory ceramic mass based on a refractory oxidic matrix material containing a source of carbon, such as graphite, carbon black or petroleum coke.Type: GrantFiled: July 5, 1995Date of Patent: July 8, 1997Assignee: Veitsch-Radex Aktiengesellschaft Fur Feuerfeste ErzeungnisseInventor: Wilfried Eckstein
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Patent number: 5279639Abstract: This invention relates to the refining of steel external to a primary steelmaking vessel, for example in the ladle. More particularly, it is: A.) a method of synthesizing a slag on the steel that (i) mitigates the detrimental effects of existing natural slag carried over from the primary steelmaking vessel, (ii) is low in specific bulk density, due to gas evolution and foaming, (iii) is suitable for refining of steel, and (iv) is not aggressive to the ladle refractory lining; B.) a method, and composition for treating any primary slag that has entered the ladle; C.) a method and composition for coating refractory linings. The present invention involves the manufacture in situ of a secondary ladle slag, the treating of ladle slag, and the protection of refractory linings by the addition of materials including calcium carbide, foaming agents such as one or more carbonates of calcium, magnesium, and sodium, and other components used to adjust slag composition.Type: GrantFiled: April 6, 1990Date of Patent: January 18, 1994Assignee: Tam Ceramics, Inc.Inventors: Frank L. Kemeny, David J. Sosinsky
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Patent number: 5221320Abstract: A stable aqueous suspension of a mixture of magnesium hydroxide and copper oxychloride, together with a suspending agent, is used to reduce deposits in kilns or furnaces used to make iron ore agglomerates, known as pellets, during a calcination process in which iron ore fines mixed with fluxing materials having a phosphate content of less than 1% by weight of the total flux and iron ore weight, are heated to from about 900.degree. to about 1400.degree. C. in order to create the hardened iron ore pellets, called flux pellets, one of the chief raw materials in steel making.Type: GrantFiled: April 30, 1992Date of Patent: June 22, 1993Assignee: Calgon CorporationInventor: Rabindra K. Sinha