Class 423/625 - Aluminum

Subclass of Class 423 - Chemistry of inorganic compounds
Definition: Products or processes wherein the metal is aluminum.
No. of patents: 515
Last issue date: 05/08/2012

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Number	Title	Issue Date
4925641	Process for preparing aluminum borate whiskers An aluminum borate whisker having a composition of 9Al2 O3 .multidot.2B2 O3 or 2Al2 O3 .multidot.B2 O3 is formed by reacting under heating at least one aluminum-supplying ...	05/15/1990
4919829	Aluminum hydroxides as solid lubricants Aluminum hydroxides are used as solid lubricants for aluminum oxides, cercs and other materials having oxide surfaces. Aluminum oxide hydroxides and aluminum trihydroxides are preferred compositions for such lubricating purposes. In particular, the use o...	04/24/1990
4902494	Process for preparing hydrated alumina consisting essentially of spherical particles by homogeneous precipitation A process for preparing hydrated alumina consisting essentially of spherical particles having a narrow granulometric distribution (polydispersion index dw/dnࣘ2) starting from aqueous solution of aluminum sulphate, the molar ratio SO4=	02/20/1990
4902666	Process for the manufacture of spheroidal bodies by selective agglomeration This invention relates to the preparation of small spheroidal solid agglomerates. More particularly, the process produces strong solid spheroidal agglomerates containing alumina or a mixture of alumina and at least one other inorganic material, which proc...	02/20/1990
4900699	Reservoir feed method of making ceramic composite structures and structures made thereby A method for producing a self-supporting ceramic composite structure, which includes a ceramic matrix embedding a filler, includes oxidizing a parent metal to form a polycrystalline material comprising the oxidation reaction product of the parent metal wi...	02/13/1990
4888033	Method of manufacturing permeable mineral membranes The invention relates to a method of manufacturing permeable mineral membranes. The method of the invention is characterized in that a thin layer of gel of peptised hydroxide of at least aluminum is deposited on a permeable perous substrate and the result...	12/19/1989
4882140	Solid aluminum hydroxide compositions Solid aluminum hydroxide compositions having improved solubility, stability and filterability are formed by adding at least a stoichiometric amount of a solid base to a concentrated solution of an aluminum salt (about 8.3% Al2 O3 or ...	11/21/1989
4882133	Method for producing a flaky material A method for producing flaky materials useful for improving, for example, a spreadability and luster of cosmetics and paints or improving mechanical characteristics of plastics, which comprises coating the liquid sol of metallic compounds onto a smooth su...	11/21/1989
4869735	Adsorbent for arsenic compound and method for removing arsenic compound from combustion gas Here is provided an adsorbent for adsorbing and removing an arsenic compound which becomes a catalyst poison in a selective contact reduction process for removing nitrogen oxides (NOx) from a combustion exhaust gas by the use of an ammonia as a reducing a...	09/26/1989
4861572	Process for manufacture of metal oxide An improved process for the manufacture of a metal oxide is disclosed. In the process wherein a hydrolyzable organometallic compound is hydrolyzed by an alkaline hydrolyzing agent in an alkaline organic solvent, and thereafter, the metal oxide is formed b...	08/29/1989
4853352	Method of making self-supporting ceramic materials and materials made thereby A method to produce an article of commerce comprising a self-supporting ceramic body by oxidation of a molten parent metal with a vapor-phase oxidant, includes applying to a surface of the parent metal a layer at least one dopant material therein. The lay...	08/01/1989
4851375	Methods of making composite ceramic articles having embedded filler A method of making self-supporting ceramic composite structures having filler embedded therein includes infiltrating a permeable mass of filler with polycrystalline material comprising an oxidation reaction product obtained by oxidation of a parent metal ...	07/25/1989
4847064	Economical process for alpha alumina production A process for making alpha alumina particles wherein a Bayer process caustic aluminate solution is treated with both alumina hydrate seed material and alpha alumina promoter particles to precipitate alumina hydrate particles. The precipitated particles ar...	07/11/1989
4837232	Dense skin ceramic structure and method of making the same The invention concerns self-supporting ceramic structures, including ceramic composite structures embedding a filler, and methods of making them. The ceramic structures comprise a polycrystalline material made by oxidation of a body of molten parent metal...	06/06/1989
4837069	Transparent alumina microspheres Procedure for making Al2 O3 spheroids, 600 micrometers in diameter or less, utilizes an AlOOH sol containing 0.25% weight percent MgO (in the form of Mg(NO3)2 .multidot.6H2 O) and HNO3. The...	06/06/1989
4836990	Removal of organics from Bayer process streams A liquor of the Bayer process, as defined, is contacted with manganese dioxide to oxidize organic material in the liquor. When the liquor is the seed wash liquor, oxalates in particular are oxidized....	06/06/1989
4835124	Alumina ceramic product from colloidal alumina Disclosed in a process for forming a ceramic body from colloidal boehmite and alpha alumina. Alpha alumina is added to the colloidal boehmite to produce a seeded gal, the seeded gel capable of being sintered at a low temperature to produce a ceramic produ...	05/30/1989
4829028	Process for producing an alumina-zirconia composite sintered material Alumina-zirconia composite sintered materials having sufficient high-temperature strength and thermal shock resistance as well as excellent mechanical strength are made by mixing Bayer alumina and/or bauxite as an alumina and baddeleyite and/or zircon san...	05/09/1989
4829031	Method of preparing ceramic compositions at lower sintering temperatures Ceramic oxide diphasic xerogels of structurally dissimilar phases (crystalline and amorphous, semicrystalline or noncrystalline) but compositionally similar phases will be converted to crystalline ceramic oxide products having enhanced densification when ...	05/09/1989
4822592	Producing alpha alumina particles with pressurized acidic steam Alumina particles having average particle size of about 1-20 microns are converted to alpha alumina in a steam-fluidized bed maintained at about 380°-600° C. and a pressure greater than about 1000 psig. Acidifying the steam reduces average crystallite s...	04/18/1989
4820498	Method for producing substantially pure alumina material A method for producing an alumina of high purity, which comprises forming an oxidation reaction product of an aluminum parent metal and an oxygen-containing vapor-phase oxidant, comminuting the resulting ceramic body, and leaching any non-alumina material...	04/11/1989
4818515	Alpha-alumina in the form of spherical non-aggregated particles having a narrow size distribution and sizes below 2 microns and process for preparing same Alpha-alumina consisting essentially of solid, spherical, non-aggregated particles, having a diameter from 0.06 to 2 μm, a polydispersion index below 2.0, a total porosity below 0.3 cc/g, a specific surface area from 0.7 to 80 m2 /g, and an ap...	04/04/1989
4808397	Process for preparing fine particles of metal oxides A process for preparing spheroid particles of oxide compounds, having an average diameter of smaller than 3 microns. An emulsion is prepared of a hydrolyzable liquid oxide compound in a perfluoropolyether, the emulsion is reacted with water, water vapor o...	02/28/1989
4806333	Finely divided oxide and its manufacture A product suitable as a ceramic comprises substantially nonaggregated alumina particles with 95% by number having an aspect ratio (i.e., the ratio of the longest dimension to the shortest dimension for any single particle) not greater than 1.1 and more th...	02/21/1989
4806198	Producing alpha-alumina whiskers Alpha-alumina whiskers are produced by forming a film of boehmite gel seeded with alpha-alumina seed material, preferably sapphire, and heating at 900° C. to 1200° C. for 5 minutes to 2 hours....	02/21/1989
4804390	Process for removing mineral impurities from coals and oil shales A process for removing mineral impurities such as metal oxides from coal and shale oil structures is disclosed. The process is carried out by subjecting crushed coal or shale to a hydrocarbon fluoride leaching solution, separating the HF leach liquor from...	02/14/1989
4801442	Method for purifying starting materials for fabricating chalchogenide glass A method for purifying starting materials for chalcogenide glass is disclosed, which comprises contacting chalcogen starting materials at a high temperature with a metal which is more susceptible to oxidation than the chalcogen starting materials to allow...	01/31/1989
4797271	Producing alumina granules in a fluidized bed The process of the present invention for preparing granules of alumina includes pretreating an alumina powder by admixing with cold water in a mixer at a temperature below room temperature, e.g., such as below about 20° C., to form a pretreated alumina h...	01/10/1989
4797139	Boehmite produced by a seeded hydyothermal process and ceramic bodies produced therefrom Microcrystalline boehmite suitable for conversion to anhydrous alumina products is produced by hydrothermal treatment of precursor alumina raw material at controlled pH and in the presence of microcrystalline boehmite seed material. Reaction mix may inclu...	01/10/1989
4797270	Method for the obtention of an especial alumina from the powder produced in metallurgical alumina calcination The process for the manufacture of special aluminas from the powder produced in the calcination of alumina hydrate, as proposed by the invention, achieves the recovery of this by-product, treating it separatedly from the rest of the alumina, in order to c...	01/10/1989
4784686	Synthesis of ultrafine powders by microwave heating A method of synthesizing ultrafine powders using microwaves is described. A water soluble material is dissolved in water and the resulting aqueous solution is exposed to microwaves until the water has been removed. The resulting material is an ultrafine p...	11/15/1988
4770869	Steam producing process and products In a process utilizing steam, the method of producing at least a portion of said steam, including heating a water-containing, solid substance for generating steam and capturing the generated steam for said process. A suitable solid substance is Al(OH)	09/13/1988
4764357	Process for producing finely divided powdery metal oxide compositions A finely divided metal oxide powdery composition, preferably with a narrow particle size distribution, is produced from a particulate, sol-gel derived composition containing agglomerates by heating the particulate composition in the presence of an effecti...	08/16/1988
4752459	Preparation of porous bodies A process for the preparation of at least one porous oxide or hydroxide body comprises: (i) adding at least one body comprising a sol of the oxide or hydroxide to a fluid freezing medium; and (ii) raising the temperature of the solid, quenched sol so that solv...	06/21/1988
4750992	Classification of alumina particles Classification of alumina particulate is achieved through use of a basic aluminum compound as a dispersant....	06/14/1988
4751070	Low temperature synthesis Ultrafine particles of ceramic or metallic material are obtained at low temperatures from a nitrate source capable of endothermic decomposition by molecularly combining under a nitrogen atmosphere the nitrate source with an inorganic reducing fuel compoun...	06/14/1988
4746503	Method of treating alumina to increase slurry life A process for treating dry, particulate alumina for use in preparing alumina slurries which are resistant to gellation in which the particulate alumina is contacted with a carbon dioxide rich gaseous medium for a suitable time....	05/24/1988
4744802	Process for durable sol-gel produced alumina-based ceramics, abrasive grain and abrasive products A sol-gel process of producing durable alpha alumina-based ceramic particularly useful as abrasive grain from alpha alumina monohydrate is improved by the addition of a nucleating agent. Improved abrasive products containing the durable ceramic abrasive g...	05/17/1988
4744974	Process for production of alumina A process for producing alumina wherein an aluminum trialkyl is reacted with a substantially water immiscible alcohol to produce an aluminum alkoxide and an alkane, the reaction between the aluminum trialkyl and the alcohol being conducted in an organic p...	05/17/1988
4737352	Use of surfactants in alumina precipitation in the bayer process A method and composition for producing a more coarse alumina trihydrate crystal in a Bayer process pregnant liquor, involving the addition of approximately 5-400 mg/l of surfactant-oil, the oil dissolving the surfactant which can be selected from a host o...	04/12/1988

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Class 423/625 - Aluminum