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| Number | Title | Issue Date |
| 7033567 | α-Alumina fine powder and a method of producing the same α-Alumina powder of fine particles having the primary particle diameters of from 10 nm to 100 nm, and of a high ratio of α-phase and further having capability to provide a sintered body with high density, and a method of manufacturing the α-alumina powder is prov... | 04/25/2006 |
| 6960336 | Method of producing low soda alumina, low soda alumina produced by the method and method of producing porcelain A method of producing alumina having a low soda content and excellent sintering properties includes the steps of adding a soda removal agent to alumina source material and calcining the alumina source material in a calciner (2), using a dust collector (5 | 11/01/2005 |
| 5723097 | Method of treating spent potliner material from aluminum reduction cells A method of treating spent potliner material from aluminum reduction cells is disclosed. The spent potliner material is introduced into a sulfuric acid digester to produce a gas component including hydrogen fluoride and hydrogen cyanide and a slurry compo... | 03/03/1998 |
| 5702500 | Integrated process for the recovery of metals and fused alumina from spent catalysts An integrated process for the treatment of spent catalysts containing mainly molybdenum, vanadium, nickel, cobalt and, alumina to produce ammonium metavanadate, vanadium pentoxide, molybdic trioxide, fused alumina and a high grade nickel/cobalt alloy esse... | 12/30/1997 |
| 5695725 | Method of preparing monoclinic BaO.A12 O3.2SiO.sub.2 Monoclinic celsian (BaO.Al2 O3.2SiO.sub.2) is produced by heating a stoichiometric, powder mixture of BaCO3 (or BaC2 O4), Al2 O3, and SiO2 (preferably SiO2 gel) ... | 12/09/1997 |
| 5334366 | Transition alumina and method for its production A new transition alumina is made by heating substantially pure diaspore in a vacuum to an elevated temperature of about 300-1000° C. The new transition alumina has increased surface area compared with alpha-alumina formed by heating diaspore in air.... | 08/02/1994 |
| 5013533 | Process for recovering valuable metals from spent catalysts A process for recovering heavy metals from spent catalysts on an alumina support material comprising calcining the catalyst feed material to remove impurities and smelting the calcined feed in an electric arc furnace, preferably with scrap iron. A reducin... | 05/07/1991 |
| 4891204 | Purification of aluminum chloride Aluminium chloride contaminated with iron chloride is purified by contacting it in vapor form with a bed of particles of aluminium metal interspersed with particles of a chemically inert material. The efficiency of the process may be maintained by acid tr... | 01/02/1990 |
| 4869893 | Preparation of high purity compounds of sulfur, selenium, and tellurium A method for preparing compounds of sulfur, selenium, and tellurium includes the formation of the compound from the elements in a closed environment which excludes oxygen, and then the purification of the compound by contacting it with carbon or carbon mo... | 09/26/1989 |
| 4842832 | Ultra-fine spherical particles of metal oxide and a method for the preparation thereof Ultra-fine spherical particles of a metal oxide having an average particle diameter of 40 nm or smaller can be prepared by a method in which a vaporizable metal compound is vaporized and decomposed under heating to give ultra-fine particles of a metal oxi... | 06/27/1989 |
| 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 |
| 4678647 | Process for the recovery of gallium and germanium from coal fly ash A method is disclosed for recovering gallium and/or germanium from fly ash which comprises pelletizing the fly ash, treating the pellets in the presence of an oxidizing gas at a temperature of from about 900° C. to just below the fusion temperature of th... | 07/07/1987 |
| 4579722 | Process for treating alumina raw materials The invention relates to a process for deironing red mud and bauxite and for the preparation of a raw material for alumina industry and of iron pentacarbonyl which comprises (a) activating the red mud or bauxite starting material at 150°-800° C. under a... | 04/01/1986 |
| 4539187 | Method for separating and recovering silica, aluminum and iron from fly ash, mineral ores and mine tailings A method for separating and recovering substantially pure aluminum, iron and silica from fly ash, a by-product of coal combustion, includes reacting the fly ash with aqueous fluosilicic acid and aqueous hydrogen fluoride at temperatures sufficiently high ... | 09/03/1985 |
| 4523949 | Aluminum dross reclamation Aluminum dross containing chlorides and combustible volatile material is agglomerated and sized to produce a compact which is then treated in a direct fired rotary kiln in excess of 1800° F. to volatilize the chlorides and burn the combustible volatile m... | 06/18/1985 |
| 4519987 | Treatment of oxidic materials In the fluidized bed chlorination of oxidic materials, for example minerals such as bauxite, tantalite, columbite, wolframite or scheelite, the separation of metal values giving vaporous chlorides at the reaction temperature is enhanced by maintaining a z... | 05/28/1985 |
| 4425308 | Production of a purified alumina-silica product and substantially pure aluminum chloride from bauxites and clays At least a single stage chlorination system for the production of a substantially iron-free alumina-silica product from Bauxites, Bauxitic Clays and Clays wherein at least one chlorination agent is selected from the group consisting of Cl2, COC... | 01/10/1984 |
| 4425311 | Production of a purified alumina-silica product and substantially pure aluminum trichloride from bauxites and clays At least a two-stage chlorination system for the production of a substantially iron-free alumina-silica product from Bauxites and Clays wherein in a preferred embodiment of the invention the chlorination agent is selected from the group consisting of Cl | 01/10/1984 |
| 4425310 | Production of aluminum chlorides from bauxites and clays At least a two stage chlorination system for the production of aluminum trichloride and aluminum monochloride wherein in the gas stream containing the highest percentages of aluminum chloride produced CO2 is present and the said gas stream is p... | 01/10/1984 |
| 4425309 | Production of a purified alumina-silica product and substantially pure aluminum trichloride from bauxites and clays At least a single stage chlorination system for the production of a substantially iron-free alumina-silica product from Bauxites, Bauxitic Clays and Clays wherein at least one chlorination agent is selected from the group consisting of Cl2, HCl... | 01/10/1984 |
| 4349516 | Process for treating the gas stream from an aluminum value chlorination process A method for producing aluminum chloride suitable for direct introduction into an aluminum chloride reduction cell by treatment of the gas stream emerging from an aluminum value source chlorination process comprising the steps of: 1. reducing and condensi... | 09/14/1982 |
| 4331645 | Alumina from alkali metal-aluminum chloride complexes A method for the production of reduction cell grade alumina from alkali metal/aluminum chloride complexes comprising the steps of: A. reacting the alkali metal/aluminum chloride complexes with oxygen in a three phase fluidized bed comprising: (I) as a solid ph... | 05/25/1982 |
| 4331637 | Process for purifying aluminum chloride A method for purifying with respect to iron, aluminum chloride produced via the chlorination of aluminum bearing ores or materials which also contain iron. The process comprising the steps of: 1. chlorinating the aluminum value containing material in a manner ... | 05/25/1982 |
| 4277446 | Removal of iron and titanium minerals from aluminum bearing materials by chlorination and beneficiation A process for the removal of iron and titanium minerals from aluminum bearing materials in at least one chlorination stage by the use of an excess of aluminum trichloride as at least the major chlorinating agent for the contained iron and titanium mineral... | 07/07/1981 |
| 4259298 | Recovery of chlorine values from iron chloride by-product in chlorination of aluminous materials The invention relates to a method of recovering the chlorine values from iron chloride obtained from the chlorination of an aluminous material containing iron oxide, such as bauxite. The method involves partially dechlorinating ferric chloride in the pres... | 03/31/1981 |
| 4252774 | Method of processing aluminous ores A method of producing aluminum chloride from aluminous materials containing compounds of iron, titanium and silicon comprising reacting the aluminous materials with carbon and a chlorine-containing gas at a temperature of about 900° K. to form a gaseous ... | 02/24/1981 |
| 4244926 | Moving bed chlorination of bauxite and ilmenite A process for the selective removal of iron from a ferruginous ore which comprises feeding the dried heated ore into a countercurrent reactor comprising a sulphidizing zone, an intermediate zone and a chlorination zone, through which zones the ore moves i... | 01/13/1981 |
| 4160808 | Pyrohydrolysis process for spent aluminum reduction cell linings An improved process is provided for the recovery of HF in increased yield from spent aluminum reduction cell linings. The spent linings are pyrohydrolyzed in a fluidized bed reactor and the generated Na-containing vapors and gases are then contacted with ... | 07/10/1979 |
| 4160809 | Modified pyrohydrolysis process for spent aluminum reduction cell linings Fluoridic spent and waste materials, such as are generated in electrolytic aluminum reduction systems, are pyrohydrolyzed in a fluidized bed reactor. For fluidization of these materials, as well as for the combustion of carbon present in the materials, an... | 07/10/1979 |
| 4158701 | Pyrohydrolysis system for processing fluorine-containing spent and waste materials A pyrohydrolysis system is provided for the recovery of valuable components from waste and spent materials generated in electrolytic aluminum reduction facilities. The pyrohydrolysis system employs a dense phase fluidized bed reaction zone for the pyrohyd... | 06/19/1979 |
| 4118464 | Process for separating silica from silicate-bearing materials A process for removing silicon from a silicate-bearing material. The silicate-bearing material is analyzed for its silicon content and mixed with a controlled quantity of carbon as indicated by the analysis. The carbon is limited to an amount less than th... | 10/03/1978 |
| 4113832 | Process for the utilization of waste materials from electrolytic aluminum reduction systems A fully integrated process is provided for the recovery of valuable components from waste materials generated in electrolytic aluminum reduction systems. The waste materials, such as spent pot linings, channel and trench cleanings, floor sweepings and spe... | 09/12/1978 |
