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| Number | Title | Issue Date |
| 7442846 | Process for the regeneration of catalysts for steam cracking Process for the regeneration of exhausted catalysts, containing one or more calcium aluminates, for steam cracking reactions, comprising treating said exhausted catalysts in a stream of water vapour at a temperature ranging from 700 to 950° C., preferably from 720 ... | 10/28/2008 |
| 7247292 | Aluminum hydroxide and production process thereof A method for producing aluminum hydroxide includes a step of elevating a temperature of a slurry of aluminum hydroxide suspended in a sodium aluminate solution from 70° C. or lower to 85° C. or higher, and a step of applying a centrifugal force to the slurry. The ... | 07/24/2007 |
| 6890647 | Alumina hydrate particle, alumina hydrate particle dispersion sol and liquid coating for forming ink-receiving layer and substrate having ink-receiving layer Highly transparent alumina hydrate particles having a large pore volume, having a pore diameter which falls in a specified range and, when formed into a high-concentration dispersion sol, exhibiting a low viscosity are provided. Alumina hydrate particles having a co... | 05/10/2005 |
| 6299846 | Process for producing aluminum hydroxide from alumina-containing ore The present invention provides a process for producing aluminum hydroxide with little contamination by silica at a high yield, while suppressing losses of consumed alumina and alkaline components. The process comprises the steps of mixing a first alumina-... | 10/09/2001 |
| 6296817 | Process for recycling waste aluminum dross Disclosed is the recycling of aluminum dross. Aluminum dross is crushed into particles which are size-classified on the basis of 1 mm. The aluminum dross particles equal to or smaller than 1 mm in size are leached with an aqueous sodium hydroxide solution... | 10/02/2001 |
| 6231822 | Recovering chloride and sulfate compounds from spent potliner A method of recovering chloride and sulfate salts from spent potliner using acid digestion.... | 05/15/2001 |
| 6086834 | Process for the removal of silica from an alkaline solution containing sodium aluminate A process is described for removing dissolved silica from an alkaline solution containing sodium aluminate, e.g. a Bayer process solution. The process comprises contacting the alkaline solution with a slowly stirred bed of particles comprising coarse sili... | 07/11/2000 |
| 5972506 | Intercalation compounds, method for preparing them and use thereof, particularly in pyrotechnics An intercalation compound of general formula Nax K1-X Zy, wherein Z is a carbon or a polymer with a cyclic, particularly aromatic unit, as base unit; 0 | 10/26/1999 |
| 5776426 | Treatment of solid material containing fluoride and sodium including mixing with caustic liquor and lime A process for treatment of a solid material containing fluoride and sodium, such as spent potlining from aluminum reduction cells, comprising the following steps: 1) contacting the solid material with recycled caustic liquor and source of calcium in a dig... | 07/07/1998 |
| 5711018 | Rotary kiln treatment of potliner An industrial waste management facility (IWMF) for disposing of spent potlining includes a co-current gas-fired rotary kiln for containing a molten pool of spent potlining throughout the entire length of the rotary kiln from the inlet to the outlet, an as... | 01/20/1998 |
| 5691082 | Beta-alumina solid electrolyte and process for production thereof A beta-alumina solid electrolyte for use in a sodium-sulfur battery is composed of beta-alumina crystals having a degree of orientation toward the C axis thereof, of 0.2-0.4 and an aspect ratio of 4.0 or less. The beta-alumina solid electrolyte is compose... | 11/25/1997 |
| 5573582 | Process for preparing fine-particulate metal hydroxide comprising aluminum hydroxide and metal oxide comprising aluminum oxide The present invention discloses a process for preparing a fine-particulate metal hydroxide comprising aluminum hydroxide as a major component which comprises continuously supplying water and a mixture of an aluminum alkoxide and at least one alkoxide of a... | 11/12/1996 |
| 5476990 | Waste management facility An industrial waste management facility (IWMF) for disposing of spent potlining includes a co-current gas-fired rotary kiln for containing a molten pool of spent potlining throughout the entire length of the rotary kiln from the inlet to the outlet, an as... | 12/19/1995 |
| 5470559 | Recycling of spent pot linings A process for recycling spent potlining material from aluminum reduction cells contaminated with fluoride and aluminum values. The process comprises first reducing the average particle size of the spent potlining material to smaller than 28 Tyler mesh to ... | 11/28/1995 |
| 5346511 | Antifoam/defoamer compositions for Bayer process A method for defoaming a Bayer process liquor, the method comprising the steps of adding to the Bayer process liquor an effective amount of an antifoam/defoamer composition comprising a polyether surfactant and a polyhydric alcohol fatty acid ester.... | 09/13/1994 |
| 5266201 | Process for the purification of aqueous solutions polluted by nitrate ions The invention relates to a process for the purification of aqueous solutions polluted by nitrate ions. This process is characterised in that it consists in precipitating hydrated double or mixed calcium nitroaluminates, such as, in particular, hydrated ca... | 11/30/1993 |
| 5232681 | Process for the preparation of an ion-conduction ceramic material A process for the preparation of stabilized sodium beta"-aluminum oxide from aluminum transition oxides includes applying a phase-stabilizing doping component and another component promoting conductivity and affixing the doping component, to surfaces of a... | 08/03/1993 |
| 5118484 | Desilication of Bayer process solutions A process is described for removing dissolved silica from process solutions or slurries formed in the Bayer process for producing alumina from bauxite. In the novel process, a Bayer process solution or slurry is contacted with porous agglomerates of a mat... | 06/02/1992 |
| 5051243 | Process for increasing the specific gravity of red mud solids This invention provides an improved process for increasing the specific gravity of red mud. The process comprises mixing red mud in an acidic solution, such as sulfur dioxide solution, having a pH of between about 1.5 and about 3.0 to form an insoluble re... | 09/24/1991 |
| 5043077 | Treatment of bayer process red mud slurries A method of treating Bayer process red mud slurries to improve or facilitate the handling thereof, comprising adding to such a slurry a minor porportion of humic acids or humates effective to reduce the viscosity of the slurry.... | 08/27/1991 |
| 4994244 | Process for producing alumina from bauxite A process for producing alumina from bauxite by the Bayer process. Bauxite slurry is pressure digested in caustic soda solution to dissolve aluminum hydroxides in the bauxite as sodium aluminate while leaving most of the remaining constituents of the baux... | 02/19/1991 |
| 4973464 | Method for the removal of cyanides from spent potlinings from aluminum manufacture A process for the treatment of ground, spent potlinings generated during the production of metallic aluminum to reduce cyanide content to environmentally nonhazardous levels. Potlinings are ground or otherwise suitably reduced in size to a particle size o... | 11/27/1990 |
| 4957564 | Process for preparing lactulose from lactose by epimerization with sodium aluminate A process for preparing lactulose from lactose in which an aqueous lactose mixture is reacted with a sodium aluminate solution and the solution obtained is continuously neutralized by feeding this solution and a sulphuric acid solution to a reactor simult... | 09/18/1990 |
| 4946664 | Method of making ଲ"-alumina The invention provides a method of making ଲ"-alumina by heating aluminium oxide in the presence of Na2 O. A metal oxide dopant in the form of Li2 O, MgO, ZnO, CoO, NiO, FeO or mixtures thereof, or a precursor of the dopant, is ... | 08/07/1990 |
| 4816122 | Preparation of aluminum fluoride from scrap aluminum cell potlinings Fluoride-containing wastes, arising in the aluminium industry, particularly spent cell linings from reduction cells, are digested with caustic soda for conversion of sodium cryolite to NaF. By use of very strong caustic soda NaF may be left in the solid residu... | 03/28/1989 |
| 4810682 | Production of useful materials including synthetic nepheline from Bayer red mud A process for production of useful materials including a product of similar composition to nepheline involves contacting a slurry of red mud with sulphur dioxide to dissolve components of the red mud that are soluble in sulphurous acid, removing residual ... | 03/07/1989 |
| 4792377 | Flux growth of sodium beta" alumina A method for growing crystals of sodium beta" alumina is described. The crystals are grown by Czochralski type processes or analogous methods wherein single crystals are formed from a flux or melt. The melt is a eutectic type liquid primarily containing N... | 12/20/1988 |
| 4732742 | Process for the production at a high level of productivity of aluminum trihydroxide in a high state of purity and with a median diameter of less than 4 micrometers, which is regulated as required A process for the production of pure aluminum trihydroxide having a controlled median diameter of less than 4 microns with a unimodal distribution and a minimum deviation. The process comprises contacting, for a short time, sodium aluminate solution with ... | 03/22/1988 |
| 4732741 | Method of making beta"-alumina A method of making beta"-alumina comprises dispersing in a precursor of aluminum oxide a member of the group comprising sodium oxide and its precursors, and dispersing in the precursor of aluminum oxide a spinel stabilizer which is a member of the group c... | 03/22/1988 |
| 4704266 | Method for producing lithium aluminate powders A method for producing γ-form lithium aluminate powders usable as a material for an electrolyte tile of molten carbonate fuel cells which comprises mixing aluminum alkoxide with one member selected from the group consisting of the lithium salts of inorga... | 11/03/1987 |
| 4668485 | Recovery of sodium aluminate from Bayer process red mud A process for recovery of valuable products from Bayer process red mud comprises the steps: (a) digesting red mud with sulphur dioxide in the presence of water to dissolve soda, alumina and silica therein; (b) heating the product of step (a), with or with... | 05/26/1987 |
| 4663132 | Method of processing sodium oxalate formed during the digestion of bauxite In a method of processing contaminated sodium oxalate which becomes available in a separating stage succeeding the digestion of bauxite in accordance with the Bayer process, chemicals used in the digesting process are recovered in that moist sodium oxalat... | 05/05/1987 |
| 4643885 | Method of processing sodium oxalate formed during the digestion of bauxite In a method for processing contaminated sodium oxalate which becomes available in a separating stage succeeding the digestion of bauxite in accordance with the Bayer process, chemicals used in the digesting process are recovered in that the moist sodium o... | 02/17/1987 |
| 4609534 | Lime cleaning process to remove manganese oxide A process for cleaning lime having undesirable levels of contaminants, particularly manganese oxide, is disclosed. The process includes leaching the contaminants from the lime with an aqueous means, preferably spent Bayer liquor, to form a slurry containi... | 09/02/1986 |
| 4587004 | Process for beneficiating oil-shale Disclosed is a process for beneficiating oil-shale wherein the oil-shale is treated in a first stage with an aqueous ammonium salt solution and in a second stage and optionally a third stage in the presence of a solution containing ammonium ions/ammonia, ... | 05/06/1986 |
| 4587005 | Process for beneficiating Rundle oil-shale Disclosed is a process for removing mineral matter from Rundle oil-shale by contacting the oil-shale with (a) an ammonium salt solution and (b) an organic solvent, at a temperature from about 0° C. to about 300° C. for a time which is sufficient to subs... | 05/06/1986 |
| 4587111 | Method of liquid-liquid extraction of gallium from a basic aqueous solution The process of liquid-liquid extraction of gallium from sodium aluminate liquor used in the Bayer alumina process, uses an organic extractant comprising a diluent and a substituted hydroxyquinoline such that gallium and some aluminum are extracted into th... | 05/06/1986 |
| 4557907 | Hydrothermal disintegration of calcined aluminum oxide wastes A process for hydrothermally disintegrating wastes or residues having a high content of calcined aluminum oxides by reacting said wastes or residues with an aqueous sodium hydroxide solution having a concentration of sodium hydroxide of from about 20 to a... | 12/10/1985 |
| 4518571 | Process for desilication of aluminate liquors in the production of alumina The process consists of two desilication stages. In the first stage the aluminate liquor resulting from digestion of the sinter is subjected to an autoclave treatment to remove the major portion of impurities of SiO2 and Fe2 O3.... | 05/21/1985 |
| 4512809 | Process for producing, from aluminous siliceous materials, clinker containing alkali metal aluminate and dicalcium silicate, and use thereof Aluminous siliceous starting materials are mixed and ground with correction materials to produce a raw mixture comprising oxides of aluminium, silicon, calcium and alkali metal having certain mole ratios, preheating the raw mixture by suspending the raw m... | 04/23/1985 |
