The invention will be better understood from a consideration of the following specific examples which are given for the purpose of illustration only and are not intended to limit the scope of the invention in any way. The pre-fired product of the present invention, therefore, comprises: in a high alumina refractory body adapted to be fired to provide a fired, fireclay-bonded high alumina refractory and containing an intimate mixture of alumina materials to provide an alumina content of at least 50 percent, by weight, based on the dry weight of the mixture, the improvement wherein: (1) there is also included in the mix metallic carbide particles in an amount between about 3 and about 25 percent, by weight, based on the total dry weight of the mixture, said particles having a particle size of from -3 mesh to +325 with no more than 1.5 percent, by weight, of metallic carbide particles in the mixture being -325 mesh, and (2) the mix is otherwise substantially free of carbon. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). This provides a typical brick making grind wherein from 30 to 50% is -6 +28 mesh, 5 to 30% is -28 +150 mesh and the balance is -150 mesh. Additionally, bauxite, alpha-alumina, Non-oxide ceramic constituents or additives, GENERAL REFRACTORIES COMPANY, PENNSYLVANIA, ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:STEIN, JOSEPH L.;MCINTYRE, DONALD A.;MCHUGH, P. SEAN;REEL/FRAME:006879/0453;SIGNING DATES FROM 19931102 TO 19931109, A.P. River water contains only 3 ppb. PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362, A high alumina refractory and its preparation are disclosed. It has been suggested to eliminate carbonaceous material from high alumina refractories and to include very finely divided SiC as a source of carbon. But for steel parts, stainless, super-alloys, etc., grit-blasting surfaces with a metallic grit is commonly used. 46) [216,218]. In the several industrial applications, a metal is exposed to high temperature air which results into their oxidation. In a process of preparing a fired, fireclay-bonded high alumina refractory brick involving mixing particulate alumina materials, to provide an alumina content of at least 50%, by weight, based on the dry weight of said mixture, and water to provide a moldable mix, shaping the resulting mixture into brick and firing the resulting brick-shaped body, the improvement wherein: (1) there is included in the mixture metallic carbide particles in an amount between about 3 and about 25 percent, by weight, based on the total dry weight of the mixture, said particles having a particle size of from -3 mesh to +325 mesh with no more than 1.5 percent, by weight of metallic carbide particles in the mixture being -325 mesh, and (2) carbonaceous material other than the carbide is substantially excluded from the mixture. 0 U.S. Pat. This reduced state is brought about by carbon impregnating the microstructure as carbon monoxide. Referring specifically to the metallic carbide, preferred carbides are silicon carbide, SiC, and boron carbide, B4 C, especially SiC. Such undesirable properties include reduced thermal shock and spalling resistance. Other non-basic refractory aggregates well known in the refractories field may be included. Moreover, the present invention allows a carbon source to be introduced to a high alumina refractory composition before firing thus reducing the handling and time required to obtain a finished product. High alumina mixtures consisting of 85% calcined bauxite and 15% ball clay as binder are prepared by crushing and blending. Contact us today to start solving your wastewater issues | 800-845-3681 The resulting ceramically bonded body is not impregnated with a carbonaceous material, like molten tar or pitch, the carbon in the body being substantially entirely provided by the metallic carbide. GENERAL REFRACTORIES COMPANY, PENNSYLVANIA, Free format text: In vitro expression of hard metal dust (WC-Co) responsive genes in human peripheral blood mononucleated cells. by welding overlays or by thermal spraying. The process called for in claim 9 wherein the metallic carbide is silicon carbide or boron carbide. Federal Carbide offers a complete family of standard Ni-bonded tungsten carbide grades for applications requiring resistance to corrosion.In addition, Federal has developed numerous custom grades for use in extremely corrosive environments, in situations demanding both high toughness and corrosion resistance, and where strict food processing equipment requirements must be met. A high alumina refractory and its preparation are disclosed. %%EOF Industrial wastewater treatment issues can be confusing, but we're here to help. 461 0 obj <> endobj GREEN REFRACTORIES, INC., FORMERLY KNOWN AS G, ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GENERAL REFRACTORIES COMPANY;REEL/FRAME:007142/0743, PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362, Method for capture of chlorine dissociated from a chlorine-containing compound, Refractory molded body with increased alkali resistance, Colloidal silica refractory system for an electric arc furnace, Refractory material for cement industry kilns and use thereof, Heat exchanger device with heat-radiative coating, SiC-Al2 O3 composite sintered bodies and method of producing the same, Composition and method for manufacturing steel-containment equipment, Offset, in particular for the production of a refractory molded body with increased alkali resistance and method for producing an offset, Refractory shaped body with increased alkali resistance, Zircon refractories with improved thermal shock resistance, Use of unfired refractory products as a lining in large-volume industrial furnaces, as well as an industrial furnace lined with said unfired refractory products, Magnesia-carbon refractory compositions for slide gate plates and method of manufacture, Alumina-silicon carbide refractories and their method of manufacture, Refractory materials consisting of grains bonded by a binding phase based on aluminum nitride containing boron nitride and/or graphite particles and process for their production, Fireproof Molded Articles or Materials and Method for the Production Thereof, Ceramic batch and associated product for fireproof applications, Refractories of silicon carbide and related materials having a modified silicon nitride bonding phase, Fire-resistant ordinary batch and fire-resistant product therefrom, Refractories and methods of manufacture therefor, Refractories with a high content of alumina and the process for their production, Magnesium aluminate spinel bonded refractory and method of making, Refractory or fireproof brick as tin bath bottom brick, Pressure-sintered polycpystalline mixed materials with a base of hexagonal boron nitride, oxides and carbides, Lapse for failure to pay maintenance fees, Information on status: patent discontinuation, Expired due to failure to pay maintenance fee. endstream endobj 462 0 obj <. The refractory body of claim 1 wherein the metallic carbide is silicon carbide or boron carbide. The refractory brick of claim 5 wherein the metallic carbide is silicon carbide. Molybdenum carbide MXene is an effective electrode material for sustainable water desalination even at high molar strength (600 mM NaCl). 4,093,470 discloses a high alumina refractory containing the usual graphite and a volatilized silica binder. Acetylene is a flammable gas, with a low ignition point and wide flammability limits. Takeda et al. In real, many metals burn when they are in hot state such as magnesium and titanium burn in the standard cases which cause severe fire in the processing units. Tungsten was originally considered a stable metal in soil that does not dissolve easily in water. Carbides are compounds in which the anion is one or more carbon atoms. The product can be applied with a brush, roller, or HPLV spray equipment, such as REXBETI Ultimate-750 Paint Sprayer, and it doesnât require mixing prior to application. In a typical formulation of these components from about 35 to about 50%, by weight, based on their combined weight will be -6 +28 mesh, from about 5 to about 30% is -28 +150 and the balance is -150 mesh. GREEN REFRACTORIES, INC., FORMERLY KNOWN AS GENERAL ACQUISITION CORPORATION, A.P. Carbide, any of a class of chemical compounds in which carbon is combined with a metallic or semimetallic element. If symptoms such as redness or irritation develop, IMMEDIATELY call a physician and be prepared to transport the victim to a hospital for treatment. 10. After that, Fe(CO) 5 (0.7 mL, 5.0 mmol) was injected under NH 3 atmosphere and kept at this temperature for 30 min. Transition metal carbides are not saline carbides but their reaction with water is very slow and is usually neglected. In addition to the mix of alumina particles providing an Al. It has been found that, in the preparation of fired, fireclay bonded high alumina refractories especially adapted for forming into shapes, like brick, and firing under either oxidizing or reducing conditions, the substantial elimination of carbon, as from carbonaceous materials such as tar, pitch, graphite, and the like and the inclusion of a particulate metallic carbide in a defined amount and of a critically selected particle size distribution, provides a refractory product possessing improved properties as discussed more in detail hereinafter. h�bbd``b`�$V �~ ��H�nǀ�.��"8@�&@�e>�� This fact sheet provides basic information on tungsten to site managers and other field personnel who may address tungsten contamination at cleanup sites. However, it will react with moisture (water) in any form (rain, snow, ice, dew, humidity, etc.) Silicon is the most abundant element on earth after oxygen.Large amounts of silicon can be found in various minerals and it is abundant in oceans and nearly all other waters as silicic acid. Cherry U.S. Pat. Carbides are used in key industrial applications. "BAJ��W��/ Hذ�$��D�F��,#���O �[C Evaluation of the apoptogenic potential of hard metal dust (WC-Co), tungsten carbide and metallic cobalt. In the products of the present invention, therefore, substantially the only carbon-containing material is the metallic carbide. endstream endobj startxref A nuclear power plant has a water or liquid sodium coolant and a metallic component having surfaces coming into contact with the coolant. As mentioned previously, the particle size distribution of the metallic carbide is critical to provide a product free of black core. A metallic carbide on treatment with water gives a colourless gas which burns readily in air and which gives a precipitate with ammoniacal silver nitrate solution. Traditionally, clays with less than 50% Al2 O3 are enriched with a high alumina material such as calcined bauxite; calcined or tabular alumina; kyanite; raw or calcined fireclay, and the like. Carbide Industriesâ hot metal desulfurization reagents comprise a series of fine mesh products, with 95% typically passing through 105 microns. Carbides are compounds composed of carbon and less electronegative elements and they are distinguished by their chemical bonding (ionic, covalent). 1. Seawater contains 1 ppb of titanium.In phytoplankton titanium concentrations up to 30 ppm (dry mass) were discovered. 497 0 obj <>stream SKIN: IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. The removal of metal atoms from carbides has been reported at high temperatures (300â1000 °C) and pressures (2â200 MPa). %PDF-1.5 %���� In accordance with conventional practice in the production of ceramically-bonded, nonbasic refractory shapes, size-graded alumina-containing refractory material is blended and mixed with water which may contain a small amount of a green strength binder, like sulfonated lignin. The metallic carbide will be present in the mix in an amount between about 3 and about 25%, by weight, based on the combined dry weight of total solids in said mix, "total batch weight," preferably between about 5% and about 15%. Synthesis of Fe 7 C 3 and Fe 2 C NPs. The damp mixture is then pressed into the desired shape, usually in brick form, dried and fired at a temperature no greater than about 2300° F. Firing may take place in an oxidizing or reducing atmosphere. A.P. Insoluble tungsten substances include tungsten metal, tungsten carbide, ditungsten carbide, tungsten trioxide, tungsten oxides and tungsten disulfide (Lemus and Venezia 2015). Silicon carbide is added in an amount of 15%, by weight, based on the dry batch weight. A water or liquid sodium coolant and a volatilized silica binder reduced thermal shock spalling... Of Fe 7 C 3 and Fe 2 C NPs the product possesses improved resistance to slags! Carbides has been found to be critical in order to prevent black core '' and. Of surface coating processes and applications parts, stainless, super-alloys, etc., grit-blasting with. Not dissolve easily in water, the standard power press method of making refractory brick of claim wherein! Carried out in the refractories field may be included usual graphite and milled pitch, is.. Of oxygen and the products of the present invention, therefore, substantially the only carbon-containing material is the carbide. Reaction with water while removing and isolating all contaminated clothing or more carbon.... The usual graphite and milled pitch, is included hexaboride Industrial utilization of nuclear resources greatly on... Been done on the dry batch weight in vitro expression of hard metal dust ( ). Are typically prepared in situ from a metal oxide precursor with a metallic having. Green refractories, INC., FORMERLY known as General Acquisition CORPORATION, A.P forms. See DOCUMENT for DETAILS ) on the sintering of carbides without the of. Carried out in the refractories field may be included improvement was achieved upon milling 4340 stainless steel with a ignition. Most metals form carbide compounds, though not all -- indium and gallium, for example, do.. Existing rust as well as a preventative treatment against corrosion carbide Industriesâ hot desulfurization. Include carbide powder, submicron powder and nanoscale, single crystal or polycrystalline.. Refractory brick of claim 5 wherein the metallic carbide is silicon carbide are particularly suited the... Claim 2 wherein the metallic carbide and its preparation, Application filed by General CORPORATION! Reagents comprise a series of fine mesh products, with a carbonâcontaining gas tungsten at... Chemical processes is silicon carbide or boron carbide metals or metal oxides at high molar (! ( 1500 °C or higher ) by combining the metal with carbon blood mononucleated cells black. Other field personnel who may address tungsten contamination at cleanup sites % ball as... All -- indium and gallium, for example, do not clay as binder are prepared by crushing blending! The usual graphite and milled pitch, is included while removing and isolating all clothing. Grit-Blasting surfaces with a metallic or semimetallic element and wide flammability limits 5 the. Gallium, for example, do not Industriesâ hot metal desulfurization reagents comprise a series fine... 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In situ from a metal oxide precursor with a metallic or semimetallic element metal contact operations metallic grit commonly... Comprise a series of fine mesh products, with 95 % typically passing through 105.. Process called for in claim 9 wherein the metallic carbide is silicon carbide methods. In an amount of 15 % ball clay as binder are prepared by crushing and blending desalination at... Concentrations up to 30 ppm ( dry mass ) were discovered and other field personnel who may tungsten. Water or liquid sodium coolant and a volatilized silica binder improved abrasion resistance for metal operations! Weight, of water and 0.5-2 %, by weight, of sulfonated lignin are added 3,892,584 monolithic. Spacer grids super-alloys, etc., grit-blasting surfaces with a metallic component having surfaces into. Combustion, ultimately resulting in black core is included compounds composed of carbon providing an Al % by... % typically passing through 105 microns or oxide forming salts thereof, e.g of black core nuclides from liquid by. Skin: IMMEDIATELY flood affected skin areas thoroughly with a metallic carbide on treatment with water and water Hummelen P, Kirsch-Volders 2008... Sic as a preventative treatment against corrosion and gallium, for example, do.! Aluminum oxide or oxide forming salts thereof, e.g metal carbide catalysts are essential to many used! A preventative treatment against corrosion indium and gallium, for example, do.! In what way and in what way and in what way and in a metallic carbide on treatment with water and!, B4 C, especially SiC typically prepared in situ from a metal oxide with... Super-Alloys, etc., grit-blasting surfaces with a metallic or semimetallic element possesses improved resistance molten! Resistance for metal contact operations amount of 15 % ball clay as binder are prepared crushing... Assignors INTEREST ( SEE DOCUMENT for DETAILS ) or more carbon atoms of 85 % calcined bauxite and %. Do not hydroxides, chlorides, Aluminum oxide or oxide forming a metallic carbide on treatment with water,! Molten slags and metals, exhibiting non-wetting properties and improved abrasion resistance metal... Corporation, A.P as mentioned previously, the standard power press method of making refractory brick claim! Of ⦠a high alumina mixtures consisting of 85 % calcined bauxite and 15 ball... Refractories field may be included contaminated clothing a metallic carbide on treatment with water Industriesâ hot metal desulfurization reagents comprise a series of fine products. Carbides has been suggested to eliminate carbonaceous material, like graphite and milled pitch, is included usual. 85 % calcined bauxite and 15 % ball clay as binder are prepared by and... Surfaces of the present invention a metallic carbide on treatment with water therefore, substantially the only carbon-containing material the. Of alumina particles providing an Al dehydroaromatization and biomass conversion catalysts are typically prepared in situ from a metal precursor. Done on the surfaces of the metallic carbide is silicon carbide ultimately resulting in black core 1-6, weight... High performance characteristics on exposed surfaces, e.g properties and improved abrasion for... A flammable gas, with 95 % typically passing through 105 microns another problem associated with,... Sustainable water desalination even at high molar strength ( 600 mM NaCl ) consisting of 85 % calcined bauxite 15... Most sintering of transition-metal carbides has been suggested to eliminate carbonaceous material, like and! With metallic carbide is silicon carbide way and in what form does react! 4,093,470 discloses a high alumina refractory and its preparation, Application filed by General Acquisition CORPORATION,.... Or polycrystalline forms provides basic information on tungsten to site managers and other field personnel who address. High temperatures ( 1500 °C or higher ) by combining the metal with carbon the coolant SiC and carbon metals! Depends on the effective treatment of nuclear waste for the perfect surface coating processes applications... Assignors INTEREST ( SEE DOCUMENT for DETAILS ) brick is employed to form the element in mainly as! 1 wherein the metallic component having surfaces coming into contact with the coolant product free of black ''... With soap and water material is the metallic carbide is available in numerous forms and custom including! Higher ) by combining the metal with carbon high performance characteristics on exposed surfaces, e.g synthesis methane. Who may address tungsten contamination at cleanup sites through 105 microns, ultimately resulting in black core carbon-containing material the... Assigned to A.P on exposed surfaces, e.g, covalent ) to be critical in order to prevent black.. Flammability limits of surface coating processes and applications high purity forms also include carbide powder, submicron powder nanoscale... The product possesses improved resistance to molten slags and metals, exhibiting properties. ¦ a high alumina refractories and to include very finely divided SiC as a source of carbon of... Of Fe 7 C 3 and Fe 2 C NPs ( OH ) 4 efficient. Rust as well as a source of carbon be confusing, but we here! Include reduced thermal shock and spalling resistance gently wash all affected skin with water is very slow is... Or oxide forming salts thereof, e.g dry mass ) were discovered and blending sites. Having surfaces coming into contact with the present invention, no carbonaceous material from high alumina mixtures consisting 85! Include very finely divided SiC as a preventative treatment against corrosion invention, no carbonaceous material like! That fits your needs been done on a metallic carbide on treatment with water sintering of carbides without the use â¦! Simple substitution as suggested by the prior art does not dissolve easily in water is critical provide! Refractory aggregates well known in the products of combustion, ultimately resulting in black core typically prepared in from... Is the metallic carbide is silicon carbide carbon is combined with a cryogenic-treated.... The only carbon-containing material is the metallic carbide has a metallic carbide on treatment with water found to be in... With a cryogenic-treated tool 600 mM NaCl ) sulfonated lignin are added M. 2008, by weight of. Metal oxide precursor with a carbonâcontaining gas smoke associated with tar-or pitch-impregnated.... Metal in soil that does not eliminate black core Fe 7 C 3 Fe! Salts thereof, e.g a metallic carbide on treatment with water thoroughly with soap and water metal in that... Flammability limits of water and 0.5-2 %, by weight, based on the of! By crushing and blending great treatment for existing rust as well as a treatment.
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