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| Number | Title | Issue Date |
| 7972580 | Methods and compositions for the removal of impurities and water from the Bayer process A liquid phase that comprises an oxalate-extracting amount of an organic salt is useful as an extractant in a liquid/liquid extraction process for purifying Bayer process streams. ... | 07/05/2011 |
| 7282148 | Porous silicon composite structure as large filtration array A novel asymmetric filter membrane, and process for making is disclosed in several exemplary versions. The membrane structure is physically robust and suitable for use in a wide variety of applications. The support membrane is may be comprised of material such as a ... | 10/16/2007 |
| 7249553 | Process and plant for destroying solid-propellant rocket motors Described is a process and a plant for destroying rocket motors, including in particular the following steps and stations: cutting of the motor into sections; cooling of the sections containing propellant by immersion in a cryogenic liquid; and fragmenting and extra... | 07/31/2007 |
| 7244404 | Process for the removal of oxalate and/or sulphate from bayer liquors A process for the removal and causticisation of sodium oxalate and/or sodium sulphate from a Bayer process liquor containing sodium carbonate and one or both of sodium oxalate and sodium sulphate in an alumina refinery is described. The process is based on the obser... | 07/17/2007 |
| 7067106 | Aluminum hydroxide, made via the bayer process, with low organic carbon A composition of matter which is aluminum hydroxide, produced using the Bayer Process, wherein the aluminum hydroxide produced has a Total Organic Carbon of less than about 0.5 milligrams Total Organic Carbon/gram aluminum hydroxide. ... | 06/27/2006 |
| 7056849 | Nanoscale ordered composites of covalent ceramics for high-temperature structural applications via block-copolymer-assisted assembly and method of making A method of making nanoscale ordered composites of covalent ceramics through block copolymer-assisted assembly. At least one polymeric precursor is mixed with a block copolymer, and self-assembly of the mixture proceeds through an annealing process. During the annea... | 06/06/2006 |
| 6960327 | Methods for removing organic compounds from nano-composite materials The present invention provides methods for selectively removing organic compound from a nano-composite material which comprises the organic compound that is dispersed within a solid inorganic compound structure. In particular, methods of the present invention compri... | 11/01/2005 |
| 6905662 | Elimination of undesirable volatile organic byproducts of an alumina process Disclosed is a process for the elimination of volatile, foul-smelling organic compounds which are liberated in a gas suspension calciner process utilized to manufacture alumina. The process comprises recirculating captured alumina dust on which undesirable volatile ... | 06/14/2005 |
| 6743403 | Process for the removal of oxalate and/or sulphate from Bayer liquors A process for the removal and causticisation of sodium oxalate and/or sodium sulphate from a Bayer process liquor containing sodium carbonate and one or both of sodium oxalate and sodium sulphate in an alumina refinery is described. The process is based on the obser... | 06/01/2004 |
| 6616902 | Feed processing for improved alumina process performance A process is disclosed for the treatment of an alumina process feedstock prior to transferring the treated feedstock to an alumina process for extracting refined alumina from the treated feedstock. The treatment process includes the following steps: (a) h... | 09/09/2003 |
| 6582670 | Feed processing for improved alumina process performance A process is provided for the treatment of an alumina process feedstock prior to transferring the treated feedstock to an alumina process for extracting refined alumina from the treated feedstock. The treatment process includes: (a) heating the alumina pr... | 06/24/2003 |
| 6555077 | Organic impurity removal process for bayer liquors A process for the removal of organic impurities in a Bayer process liquor in which wet and dry oxidation processes are linked together in a complementary way, such that the weaknesses of each individual organic removal process become a strength of the com... | 04/29/2003 |
| 6528028 | Process for treating bauxite in which a desilication product and an insoluble residure are separately precipitated A process in which alumina is extracted from bauxite with an aqueous alkali solution, and a desilication product is precipitated such that the product is not contained in a bauxite residue and does not form a complex. The desilication product is mixed wit... | 03/04/2003 |
| 6479024 | Process for removing impurities from bauxite A process for producing alumina from bauxite is described in which bauxite is treated with an alkali to form a mixture comprising a solution of aluminum-containing ions and alumina trihydrate is precipitated from the solution. The process comprises treatm... | 11/12/2002 |
| 6293973 | Method of controlling oxalate precipitation in bayer process liquor A method is disclosed for controlling the precipitation of soluble sodium oxalate in Bayer process liquor which comprises adding a surface active quaternary ammonium compound to the Bayer process liquor and then subsequently adding a mixture of a hydropho... | 09/25/2001 |
| 6187206 | Thermal plasma reactor and wastewater treatment method The invention relates to a reactor for the treatment of wastewater solutions containing cyanide and other dissolved organic material, having an elongated tube having an entrance (28) and an exit (32), and an energy source (22) for the tube, preferably pos... | 02/13/2001 |
| 6074623 | Process for thermal destruction of spent potliners Spent potliners from the aluminum processing industry are destroyed by gasification technology to produce an inert vitreous frit and useful gases including hydrogen fluoride, hydrogen and carbon monoxide. In one embodiment, the potliner material is proces... | 06/13/2000 |
| 5942199 | Method for the treatment of impure aluminium oxide The invention relates to a method for the treatment of an impure aluminium oxide so that the organic impurities present therein it are converted into an insoluble and easily separable substance. According to the invention, aluminium oxide which contains o... | 08/24/1999 |
| 5902560 | Method for inhibiting precipitation of sodium oxalate in a Bayer process liquor A new and improved method for inhibiting the precipitation of sodium oxalate crystals in a Bayer process liquor is provided. In an embodiment, the method comprises the step of adding to the Bayer process liquor, after red mud separation, a minor effective... | 05/11/1999 |
| 5888461 | Process for purifying sodium aluminate solutions containing sodium oxalate Process of sodium oxalate purification of sodium aluminate solutions resulting from alkaline attack of bauxites according to the Bayer process, comprising: precipitation of said sodium oxalate in at least a fraction of the pre-decomposed sodium aluminate ... | 03/30/1999 |
| 5837215 | Method of removing insoluble materials from bayer process with fatty acid and fatty acid free polymer flocculants A method for flocculation of red mud in Bayer Process streams utilizing a fatty acid or fatty acid ester free latex polymer flocculant. Preferred fatty acid free emulsifiers useful for the preparation of such flocculants are obtained by reacting ethylene ... | 11/17/1998 |
| 5837211 | Compositions and method for foam control in Bayer process Methods of reducing foam in Bayer process liquor are provided, said methods comprising adding a composition to the Bayer process liquor that comprises a tri(alkoxy alkyl) phosphate and a hydroxyl group containing carrier.... | 11/17/1998 |
| 5728180 | Adsorbent combinations for enhanced removal of sodium oxalate from bayer process spent liquor Sodium oxalate is precipitated from spent Bayer process liquor by mixture with a low total alkalinity (TA) sodium oxalate seed solution that has been treated with two or more adsorbents to remove organic poisons from the sodium oxalate. The adsorbents are... | 03/17/1998 |
| 5653946 | Process for fluidifying aqueous suspensions of red muds in the production of alumina by the bayer process Improved process for fluidifying flocculated aqueous suspensions of red muds in the production of alumina from bauxite by the Bayer process, which consists: in dissolving bauxite using sodium hydroxide; then, in decanting and in washing the red muds formed in ... | 08/05/1997 |
| 5624646 | Method for improving the brightness of aluminum hydroxide There is disclosed a method for improving the brightness level of aluminum hydroxide removed from a caustic solution. The method comprises:(a) pre-filtering the solution to remove contaminants therefrom; and (b) contacting the filtered solution with an ad... | 04/29/1997 |
| 5547647 | Production of alumina Bauxite that is to be used in the Bayer process for the recovery of alumina is washed with aqueous wash liquor having a caustic content of at least 50 g/l and which comprises aqueous caustic from the alumina recovery circuit of the Bayer process and, afte... | 08/20/1996 |
| 5451329 | Dewatering of alumina trihydrate The use of a dewatering aid comprising a sulfosuccinate and an oil in the filtration of alumina trihydrate is disclosed.... | 09/19/1995 |
| 5427750 | Polymers for removing humates from bayer process liquors Organic impurities are removed from Bayer process liquors using a polymer which contains vinylamine and/or vinylformamide.... | 06/27/1995 |
| 5415782 | Method for the alteration of siliceous materials from bayer process liquors Siliceous materials produced by thermally treating spent Bayer process liquors are obtained in modified form when produced in the presence of polymeric quaternary ammonium compounds, polyamine polymers, copolymers of acrylic acid and acrylamide, and polya... | 05/16/1995 |
| 5401487 | Process to obtain zeolite 4A starting from bauxite The invention purpose is a process to obtain gel to elaborate Zeolite 4A, to be used in detergents due to its capacity for calcium absortion; the process lies on the obtention of an alkaline aluminum solution starting from bauxite provided by tank 3 which... | 03/28/1995 |
| 5385586 | Liquor oxalate stabilizers A method for inhibiting the precipitation of sodium oxalate crystals in a Bayer process liquor. The method comprises the step of adding to the Bayer process liquor, after red mud separation and immediately prior to crystallization of alumina trihydrate, o... | 01/31/1995 |
| 5365012 | Process for the heat treatment of spent pot linings derived from Hall-Heroult electrolytic cells A process for heat treating spent pot linings from Hall-Heroult electrolytic cells which comprise carbon and silico-aluminous materials impregnated with fluorides. The pot linings are ground to a particle size less than 5 mm, and formed into an intimate m... | 11/15/1994 |
| 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 |
| 5331106 | Resource recovery system Waste energetic compositions such as solid rocket propellant are treated to reclaim valuable aluminum particles and oxidizer in a form in which they can be reused, and to incinerate the remaining solids in a totally environmentally sound manner. An initia... | 07/19/1994 |
| 5284634 | Purification of Bayer process liquors using cationic polymeric quaternary ammonium salts Bayer process liquors derived from the digestion of bauxites with a caustic solution are purified by removing the organic impurities present in the liquors. Removal of these impurities is accomplished by treating the liquor containing dispersed solids wit... | 02/08/1994 |
| 5275628 | Compositions and method for foam control and crystal modification in 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 water-soluble polypropylene glycol having an average molecular weight... | 01/04/1994 |
| 5245115 | Process for the thermal shock treatment of spent pot linings obtained from Hall-Heroult electrolytic cells The invention relates to a thermal shock treatment in a reactor of ground spent pot linings, constituted both by carbon-containing products and silico-aluminous products impregnated with fluorine-containing mineral compounds, mixed with a pulverulent mine... | 09/14/1993 |
| 5133874 | Removal of humate from bayer alumina liquors A process is disclosed for reducing the turbidity of a Bayer process liquor containing a cationic polymer-humate complex comprising adding to said liquor a higher molecular weight, cationic polymer.... | 07/28/1992 |
| 5106599 | Alumina crystal growth additive A method of modifying crystal structure of alumina trihydrate crystallizing from saturated Bayer liquors, which method includes the treatment of the saturated Bayer liquors with a crystal modifying amount of a polysaccharide, preferably a dextran.... | 04/21/1992 |
| 5106824 | Method of manufacturing oxide superconductor and the precursor of the oxide superconductor comprising heat treating in a reducing atmosphere of either hydrogen or carbon monoxide under reduced pressure Disclosed is a method of manufacturing an oxide superconductor containing at least an alkaline earth metal and copper. This method comprises the steps of heating a material substance containing elements constituting the oxide superconductor, in an atmosph... | 04/21/1992 |
