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| Number | Title | Issue Date |
| 7214362 | Purification method for producing high purity niobium compound and/or tantalum compound An object of the present invention is to provide a method for purifying a highly pure niobium compound and/or tantalum compound, the method enabling the purification of a highly pure niobium compound and tantalum compound in a simplified manner at a low cost. The ob... | 05/08/2007 |
| 7192564 | Method for recycling spent lithium metal polymer rechargeable batteries and related materials The method relates to a pyrometallurgical and hydrometallurgical process for the recovery and recycling of lithium and vanadium compounds from a material comprising spent rechargeable lithium batteries, particularly lithium metal gel and solid polymer electrolyte re... | 03/20/2007 |
| 7182925 | Tantalum concentrates dissolution and purification method A method for the dissolution and purification of tantalum ore and synthetic concentrates is described. The method preferably uses ammonium bifluoride as the fluoride source in place of the hydrofluoric acid used in the conventional methods. Other fluoride compounds ... | 02/27/2007 |
| 7052660 | Wet-processing method for combustion ashes of petroleum fuels There is disclosed a wet-processing method for combustion ashes of petroleum fuels, comprising a slurry preparation step of preparing a slurry of the combustion ashes; a metal oxidation step of preparing a slurry containing ammonium metavanadate; a solid/liquid sepa... | 05/30/2006 |
| 6979429 | Method for solubilizing metal values The processes of the present invention include mineral acid leaching of a metal containing material, such as an ore residue, containing fluoridated metal values in the presence of a complexing agent which will complex fluoride ions. The processes of the present inve... | 12/27/2005 |
| 6843970 | Process for recovering metal values by dissolving them in a sulfuric acid solution containing a carbon source and a reducing agent A process for recovering metal values from a metal containing material including the metal values comprising digesting the metal containing material in a sulfuric acid solution comprising sulfuric acid, a reducing agent, and a carbon source, heating the digestion mi... | 01/18/2005 |
| 6835449 | Nanostructured titania coated titanium A ball valve for use in the pressure acid leaching of nickel ores is disclosed. The valve has a valve body and a ball centrally positioned in the valve body, which has a central passage rotatable in the valve body between open and closed positions. At least one seat... | 12/28/2004 |
| 6800259 | Methods to control H2S and arsine emissions Methods to control hydrogen sulfide and/or arsine emissions are described. The method involves adding at least one copper compound (such as a copper(II) compound) to the material, such as material containing sulfur in a sufficient amount to control said emissions. T... | 10/05/2004 |
| 6777511 | Process for producing poly (meth) acrylates having reduced metal content An industrially excellent process for producing a poly(meth)acrylate having a reduced metal content which comprises contacting a mixture of a poly(meth)acrylate and an organic solvent with an acidic aqueous solution, such as an aqueous solution obtained by dissolvin... | 08/17/2004 |
| 6641641 | Method for producing metal or metal compound comprising process of treating with fluorine and adjusted raw material used therein An object of the present invention is to provide a method for preventing concentration of a radioactive substance in a generated extraction residue in a method of producing tantalum, niobium, or a similar substance including collecting and refining a raw ... | 11/04/2003 |
| 6608001 | Catalyst and method of making micrometer sized spherical particles A method for producing small spherical particles that are especially useful as catalysts and catalyst supports employed in chemical processes is disclosed. According to some embodiments, the method includes impregnating a porous support with a metal or me... | 08/19/2003 |
| 6383459 | Method for purifying a tantalum compound using a fluoride compound and sulfuric acid A direct dissolution method for the purification of technical grade hydrated ammonium tantalum oxide (HATO), (NH4)2-x Hx Ta2 O6.nH.sub.2 O), and related compounds such as tantalum hydroxide and tantal... | 05/07/2002 |
| 6214301 | Hafnium radioisotope recovery from irradiated tantalum Hafnium is recovered from irradiated tantalum by: (a) contacting the irradiated tantalum with at least one acid to obtain a solution of dissolved tantalum; (b) combining an aqueous solution of a calcium compound with the solution of dissolved tantalum to ... | 04/10/2001 |
| 6180072 | Process to recover metals from spent catalyst There is provided a process to reclaim metals from catalysts, said process comprising collecting one or more catalyst containing at least one metal sulfide; leaching the catalyst in an atmospheric leach step; separating the leached slurry into a first liq... | 01/30/2001 |
| 6153155 | Recovery of the transition metal component of catalyst used in heavy feed hydroconversion The invention relates to a process for recovering the transition metal component of catalysts used in the hydroconversion of heavy hydrocarbonaceous materials. In accordance with the invention, a slurry of a transition metal catalyst and hydrocarbon is ca... | 11/28/2000 |
| 6027543 | Method for removing a heavy metal from sludge A method for removing a heavy metal from sludge, including the step of putting the sludge into contact with a treating liquid to dissolve the heavy metal contained in the sludge into the treating liquid. The treating liquid is formed of either A or B, whe... | 02/22/2000 |
| 5945342 | Method for digesting spent ion exchange resins and recovering actinides therefrom using microwave radiation The present invention relates to methods for digesting diphosphonic acid substituted cation exchange resins that have become loaded with actinides, rare earth metals, or heavy metals, in a way that allows for downstream chromatographic analysis of the ads... | 08/31/1999 |
| 5787332 | Process for recovering tantalum and/or niobium compounds from composites containing a variety of metal compounds A process for treating composite materials comprising metals and having significant radioactivity for separation into concentrated individual products is provided. The process of the invention recovers valuable metals and semi-metal elements including rar... | 07/28/1998 |
| 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 |
| 5635146 | Method for the dissolution and purification of tantalum pentoxide A method is disclosed for the dissolution and purification of tantalum pentoxide. The impure tantalum pentoxide is reacted with a potassium-containing compound to form potassium tantalate. The potassium tantalate is optionally slurried with sulfuric acid ... | 06/03/1997 |
| 5587132 | Method for producing high purity vanadium electrolytic solution A method for producing an electrolytic solution containing vanadium as positive and negative electrode active material, the electrolytic solutions being suitable for a redox battery which comprises: the steps of (1) a vanadium compound is dissolved in a s... | 12/24/1996 |
| 5494648 | Process for removing thorium and recovering vanadium from titanium chlorinator waste A process for removal of thorium from titanium chlorinator waste comprising: (a) leaching an anhydrous titanium chlorinator waste in water or dilute hydrochloric acid solution and filtering to separate insoluble minerals and coke fractions from soluble me... | 02/27/1996 |
| 5491078 | Leach solution containing glucose, galactose, catalase, glucose oxidase, galactose oxidase, ascorbic acid and water soluble metal cyanides and halides A leach solution comprises water, glucose and glucose oxidase. The oxidase acts upon the glucose to produce gluconic acid and hydrogen peroxide. The leach solution reacts with mineral elements and compounds to produce a leach reaction solution from which ... | 02/13/1996 |
| 5437849 | Method of processing vanadium-containing residues To process vanadium-containing residues, the residues are leached in an aqueous slurry with introduction of SO2, the undissolved solids are removed. To effect a processing which is simple, economical and ecologically satisfactory, vanadium cont... | 08/01/1995 |
| 5437848 | Recovery of metal values from process residues A process for recovering metal and acid values from a source material containing metallic fluorides comprises digesting the source material in sulfuric acid to form a slurry, separating a fluoride containing solid phase and a metal containing first liquid... | 08/01/1995 |
| 5431892 | Process for recovering valuable metal from waste catalyst A process for recovering valuable metals from a waste catalyst based on an alumina carrier includes (a) roasting the waste catalyst at a temperature range of 400° to 1,000° C. to obtain a roasted product; (b) preparing a reduction dissolution by dissolv... | 07/11/1995 |
| 5415849 | Process for dissolving used catalyst A process for dissolving used catalyst includes the steps of roasting, after subjecting to an optional deoiling treatment, the used catalyst at a temperature lower than 1,000° C. but not lower than the temperature at which any of the residual components ... | 05/16/1995 |
| 5385827 | Method of geochemical prospecting A method of geochemical prospecting where samples of soil, sediment and rock in a geological area are collected and each sample is contacted with a leach solution of water, glucose and glucose oxidase. The oxidase acts upon the glucose to produce gluconic... | 01/31/1995 |
| 5384105 | Metal and fluorine values recovery from mineral ore treatment The process for recovering Ta/Nb values from highly flourinated ore materials by the process of; (a) contacting the materials with one or a mixture of HNO3 or HCl, and H3 BO3 wherein the H3 BO3 to other ac... | 01/24/1995 |
| 5352270 | Method for recycling metal containing electrical components The present invention relates to methods of recycling metal containing electrical components to recover one or more metal values therefrom by comminuting the used metal containing electrical component, preferably in an inert environment, separating water ... | 10/04/1994 |
| 5277795 | Process and apparatus for recovering heavy metal from carbonaceous material Heavy metal compounds, particularly vanadium pentoxide, are recovered from petroleum coke by combusting the coke under conditions constraining the temperatures to within the range 680° C. to 1400° C., collecting the ash which is then subjected to a know... | 01/11/1994 |
| 5271910 | Process of treating metal chloride wastes A process of treating metal chloride wastes produced by chlorination of titanium ore comprises the steps of: (a) leaching said metal chloride wastes in a hydrochloric acid (HCl)-containing solution to obtain a solution containing solids and dissolved meta... | 12/21/1993 |
| 5250483 | Method for treatment of catalysts using denitrifying bacteria A method of releasing metals from catalysts in a form that is readily recoverable using denitrifying bacteria is disclosed. The method can be used to regenerate catalysts and to recover metals from catalysts, especially molybdenum and nickel.... | 10/05/1993 |
| 5209910 | Process for the recovery and separation of tantalum and niobium Improved solvent extraction recovery of tantalum and niobium oxides from an acid solution of raw materials containing such oxides wherein the charged organic solvent [e.g., MIBK] is washed out (a) with 8-16N sulfuric acid and then (b) with water or dilute... | 05/11/1993 |
| 5084253 | Method of removing niobium from uranium-niobium alloy A method of removing niobium from a uranium-niobium alloy includes dissolving the uranium-niobium alloy metal pieces in a first aqueous solution containing an acid selected from a group consisting of HCl and H2 SO4 and a fluoboric ac... | 01/28/1992 |
| 5023059 | Recovery of metal values and hydrofluoric acid from tantalum and columbium waste sludge A metallurgical processing system for economically recovering metal values, such as columbium, tantalum, thorium, and uranium from dilute source solids, such as digestion sludges, by a series of steps including: 1) slurrying the source solids with dilute hydro... | 06/11/1991 |
| 4950359 | Process for removing a coating containing niobium from a substrate Cleaning baths for the removal of a coating containing niobium on a substrate, consisting of an aqueous solution of hydrogen peroxide and of alkali metal hydroxide. The coating is treated with the bath, to remove it from the substrate by dissolving.... | 08/21/1990 |
| 4948570 | Process for lowering residual tantalum values in niobium The process for removing tantalum values from niobium values wherein a NbCl5 /TaCl5 charge mixture having a molar ratio from about 10/1 to about 10,000/1 is mixed with a 8N to 20N aqueous HCl solution at a total charge concentration ... | 08/14/1990 |
| 4942024 | Method for refining hydroxides of niobium and tantalum containing transition metals Refining of either niobium hydroxide or tantalum hydroxide containing transition metals as impurities is accomplished easily and economically by dissolving the metal hydroxide in an aqueous solution of either hydrofluoric acid or oxalic acid, adjusting th... | 07/17/1990 |
| 4937063 | Bismuth vanadate process An improved solid state process for the preparation of compounds based on bismuth vanadate wherein the improvement comprises subjecting the reaction product to wet grinding in alkaline solution or to sequential wet grinding and alkaline treatment, said pr... | 06/26/1990 |
