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| Number | Title | Issue Date |
| 7968066 | Method for production of alkali metal chromates This invention relates to a method for producing chromates, especially for producing alkali metal chromates. The method comprises following steps: the obtaining of a mixture of alkali metal hydroxide, alkali metal chromate, and ferrous residue after the reaction of ... | 06/28/2011 |
| 7824633 | System and method for conversion of molybdenite to one or more molybdenum oxides A system and method for producing molybdenum oxide(s) from molybdenum sulfide are disclosed. The system includes a pressure leach vessel, a solid-liquid separation stage coupled to the pressure leach vessel, a solvent-extraction stage coupled to the solid-liquid sep... | 11/02/2010 |
| 7157063 | Process for the utilization of vanadium from chromium ore as vanadium (V) oxide Process wherein the vanadium present in the chromium ore chromite is recovered as vanadium pentoxide during the course of the fusion of the chromium ore with alkali and its work-up to produce sodium chromate solution and sodium dichromate. ... | 01/02/2007 |
| 7157072 | Cathode composition for lithium batteries and method of preparing the same Provided is a cathode composition for lithium secondary battery that includes a lithium-chromium-titanium-manganese oxide that has the formula Li[Li(1-x)/3CrxTi(2/3)yMn2(1-x-y)/3]O2 where 0≦x≦0.3, 0≦y≦0.... | 01/02/2007 |
| 6953565 | Process for producing ammonium polythimolybdate A process for producing an ammonium polythiomolybdate of the formula (NH4)2Mo3S13.n H2O where n is 0, 1 or 2 in which an aqueous ammoniacal molybdate solution is reacted with hydrogen sulfide gas in a closed sys... | 10/11/2005 |
| 6833124 | Recovery process for wastes containing hexavalent chromium A process for recovery of hexavalent chromium from waste streams. The method includes providing a waste stream containing hexavalent chromium, reacting a soluble non-toxic precipitating reagent with the hexavalent chromium to form an insoluble precipitating reagent-... | 12/21/2004 |
| 6653066 | Device and method for detecting polyvalent substances Disclosed is a device and method of use for detecting polyvalent analytes such as antibody to the AIDS virus, utilizing an inverse sandwich method. The test device comprises a first substance having an epitope, bound to a label and capable of moving withi... | 11/25/2003 |
| 6352571 | Method of making metal composite materials One or more metal salts of at least one iron group metal containing organic groups are dissolved in at least one polar solvent and complex bound with at least one complex former comprising functional groups in the form of OH or NR3, (R.dbd.H or... | 03/05/2002 |
| 6149883 | Pressure oxidation process for the production of molybdenum trioxide from molybdenite Molybdenum trioxide is produced from molybdenite by a pressure oxidation process comprising of the steps of forming an aqueous slurry of molybdenite, pressure oxidizing the slurry to form soluble and insoluble molybdenum species, converting the insoluble ... | 11/21/2000 |
| 5858324 | Lithium based compounds useful as electrodes and method for preparing same A process for preparing a compound that includes the steps of: (a) preparing a solution comprising (i) a chromium source, (ii) a manganese source, (iii) a lithium source, and (iv) an oxygen source, where the relative amounts of each of the sources is sele... | 01/12/1999 |
| 5820844 | Method for the production of a purified MoO3 composition A method for producing purified MoO3 from MoS2. MoS2 is initially oxidized to generate an impure MoO3 product containing metallic contaminants and molybdenum sub-oxides. This product is then slurried with a prim... | 10/13/1998 |
| 5804151 | Process for autoclaving molybdenum disulfide A method for producing MoO3 from MoS2. MoS2 is combined with water to form a slurry which is then combined with at least one oxygen-containing oxidizing gas in a reaction chamber in order to initiate oxidization and conver... | 09/08/1998 |
| 5788938 | Recovery of tungsten from ferrotungsten A method is provided whereby tungsten values are recovered from ferrotungsten by completely oxidizing the ferrotungsten at high temperatures in an oxygen atmosphere followed by digestion with sodium hydroxide to form soluble sodium tungstate. The sodium t... | 08/04/1998 |
| 5776848 | Molybdenum epoxidation catalyst recovery An aqueous epoxidation process stream containing molybdenum and sodium values is incinerated and an aqueous solution containing molybdenum and sodium is recovered, acidified and reacted with a calcium compound without first adding base to form solid CaMoO... | 07/07/1998 |
| 5743197 | Grate assembly for a fluidized bed boiler A grate assembly for a fluidized bed boiler comprises a number of parallel sparge pipes or the like extending side-by-side in a substantially horizontal plane and provided with elements for supplying fluidizing air from within the sparge pipes or the like... | 04/28/1998 |
| 5599514 | Process for recovering cobalt and tungsten from reaction liquors Process for recovering and re-using cobalt and tungsten from reaction liquors, in which said reaction liquors are treated: a) With an alkali-earth metal hydroxide in order to precipitate cobalt and tungsten, and the resulting precipitate is subsequently treate... | 02/04/1997 |
| 5594929 | Method of preparing powders for hard materials According to the invention there is now provided a simple method of preparing a powder containing WC and cobalt and/or nickel. APT-powder and a powder of a basic salt of cobalt and/or cobalt are mixed in water or in mixed solvents. The suspension is stirr... | 01/14/1997 |
| 5585077 | Molybdenum epoxidation catalyst recovery An aqueous epoxidation process stream containing molybdenum and sodium values and organics is treated for organics removal as by incineration and an aqueous solution containing molybdenum and sodium is recovered, acidified and reacted with a calcium compo... | 12/17/1996 |
| 5571489 | Process for chromium recovery from aqueous solutions A process for recovery of chromium in an aqueous solution comprising converting the chromium to chromyl chloride, separating the chromyl chloride from the aqueous solution, either as a heavy underlayer, or by extraction into a solvent, purifying the chrom... | 11/05/1996 |
| 5547588 | Enhanced ettringite formation for the treatment of hazardous liquid waste A process for treatment of hazardous liquid waste comprising trace amounts of hazardous elements in solution as oxyanions by oxyanion fixation within ettringite and related minerals. In accordance with the disclosed process, reagents for forming ettringit... | 08/20/1996 |
| 5503813 | Molybdenum recovery from epoxidate Epoxidate from the molybdenum catalyzed epoxidation of an olefin such as propylene with a hydroperoxide such as ethylbenzene hydroperoxide is treated with 2 to 15 times the stoichiometric equivalent of aqueous base such as sodium hydroxide to form Na... | 04/02/1996 |
| 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 |
| 5279804 | Vanadium removal in aqueous streams Disclosed is a method of removing soluble vanadium from an aqueous stream containing sodium chromate or sodium bichromate. The liquor is passed over a water-insoluble trivalent chromium compound, and the vanadium in the liquor is extracted from the liquor... | 01/18/1994 |
| 5273735 | Process for the preparation of sodium dichromate A process for the preparation of sodium dichromate and sodium dichromate solutions by alkaline oxidizing roasting of chromium ores, leaching resulting roast with water, adjustment of the pH to 7 to 9.5, removal of the insoluble constituents by filtration,... | 12/28/1993 |
| 5273726 | Removal of aluminum from ammonium molybdate solution Aluminum is removed from ammonium molybdate solution by the use of Mg+2 in the solution to precipitate out the aluminum.... | 12/28/1993 |
| 5204073 | Toxicity elimination and comprehensive utilization of chrome residues This invention relates to a method for toxicity comprehensive elimination of chrome residues, comprising adding water to chrome residues, wet-grinding the same to a thick liquid, letting it react with dilute hydrochloric acid, and letting the filtrate obt... | 04/20/1993 |
| 5082637 | Removal of potassium from ammonium molybdate Potassium impurity is removed from ammonium molybdate by dissolving the ammonium molybdate in hot acid, allowing the acid solution to cool whereby the ammonium molybdate precipitates out of the solution as molybdenum trioxide and then separating, washing ... | 01/21/1992 |
| 5007960 | Method for removing chromium from chromium containing waste material A method is provided for removing chromium from a chromium containing waste material wherein the waste material is dried by indirect heating, sized to a particle size of less than 0.105 mm, mixed with alkaline and oxidizing reactants, and reacted in a rea... | 04/16/1991 |
| 4968503 | Process for the production of sodium dichromate A process for the production of sodium dichromate comprising reacting sodium chromate with acids, the acids being sulfuric acid and NaHSO4 formed as a waste product in the production of CrO3 and thus being contaminated with chromium ... | 11/06/1990 |
| 4885144 | Process for purifying molybdenum A process is disclosed for purifying molybdenum which involves adding to an acidic slurry of molybdenum trioxide, a source of magnesium ions in a solid form, with the amount of magnesium and the magnesium ion concentration in the subsequently formed ammon... | 12/05/1989 |
| 4859431 | Rhenium generator system and its preparation and use A process for preparing a tungsten-188/rhenium-188 generator having a tungstate matrix containing W-188 produced by irradiating tungsten-186 in the tungstate compound. High activity, carrier-free rhenium-188 may be obtained by elution. Substrates for furt... | 08/22/1989 |
| 4702895 | Purification of molybdenum A method is disclosed for purifying molybdenum which involves adding to an ammoniacal ammonium molybdate solution containing the impurities of phosphorus and arsenic with the phosphorus concentration being from about 0.01 to about 0.12 g/l, a soluble magn... | 10/27/1987 |
| 4629503 | Process for the recovery of tungsten in a pure form from tungsten-containing materials The present invention relates to a simple process for the recovery of pure tungsten at a high yield from cemented tungsten carbide or tungsten alloys scrap. According to the invention the process consists of a series of steps characterized by certain crit... | 12/16/1986 |
| 4605538 | Production of pure molybdenum A process is disclosed for producing pure molybdenum which involves contacting a molybdate solution with a true liquid alkaloid in an amount sufficient to form an alkaloid-molybdenum compound with essentially all of the molybdenum. The resulting alkaloid-... | 08/12/1986 |
| 4604266 | Process for purifying molybdenum trioxide Processes are described for preparing pure ammonium molybdate from impure roasted molybdenum concentrates. An aqueous solution of nitric acid and ammonium nitrate is contacted with impure molybdenum concentrate to solubilize a major portion of the impurit... | 08/05/1986 |
| 4604267 | Process for purifying molybdenum trioxide Processes are described for preparing pure ammonium molybdate from impure roasted molybdenum concentrates. An aqueous solution of nitric acid, ammonium sulfate, and ammonium nitrate is contacted with impure molybdenum concentrate to solubilize a major por... | 08/05/1986 |
| 4601890 | Process for purifying molybdenum trioxide Processes are described for preparing pure ammonium molybdate from impure roasted molybdenum concentrates. An aqueous solution of hydrochloric acid and ammonium nitrate is contacted with impure molybdenum concentrate to solubilize a major portion of the i... | 07/22/1986 |
| 4596701 | Process for purifying molybdenum trioxide Processes are described for preparing pure ammonium molybdate from impure roasted molybdenum concentrates. An aqueous solution of sulfuric acid, ammonium sulfate, and ammonium persulfate is contacted with impure molybdenum concentrate to solubilize a majo... | 06/24/1986 |
| 4555386 | Process for purifying molybdenum trioxide Processes are described for preparing pure ammonium molybdate from impure roasted molybdenum concentrates. An aqueous solution of nitric acid, ammmonium sulfate, and ammonium nitrate is contacted with impure molybdenum concentrate to solubilize a major po... | 11/26/1985 |
| 4552729 | Method for removing tin from sodium tungstate solution A method is disclosed for removing tin from aqueous sodium tungstate solutions. The method involves adding ammonia to the sodium tungstate solution, adjusting the pH to above about 9.5 with an acid, adding magnesium chloride to form insoluble material con... | 11/12/1985 |
