Process for recovering tantalum and/or niobium compounds from composites containing a variety of metal compounds
September 26, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3107976 Process for recovering niobium and/or tantalum compounds from such ores further containing complexes of uranium, thorium, titanium and/or rare earth metals Process for recovering niobium and/or tantalum metal compounds from such ores further containing complexes of uranium, thorium, titanium and/or rare earth metals Process for the recovery of tantalum values Recovery of tungsten, scandium, iron, and manganese from tungsten bearing material Recovery of metal values and hydrofluoric acid from tantalum and columbium waste sludge Method of removing niobium from uranium-niobium alloy Metal and fluorine values recovery from mineral ore treatment Metal and fluorine values recovery from mineral ore treatment Non-primate vitreal replacement process InventorsAssigneeApplicationNo. 721104 filed on 09/26/1996US Classes:423/9, Organo-nitrogen solvent423/16, Forming peroxide (e.g., U04, etc.)423/21.1, Rare earth metal (At. No. 21, 39, or 57-71)423/21.5, Ion exchanging or liquid-liquid extracting423/68, Leaching, washing, or dissolving423/70Ion exchanging or liquid-liquid extractingExaminersPrimary: Langel, Wayne A.Attorney, Agent or FirmForeign Patent References
International ClassesC01F 017/00C01G 033/00 C01G 035/00 C01G 043/025 AbstractA 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 rare earth, transition metal, radioactive elements, and compounds and composites thereof as commercially viable products while isolating the radioactive components. They key components in the composite material which are desired to be recovered are tantalum, niobium, and scandium due to their high commercial values and significant quantities. The process further includes the capability to recover uranium, thorium, rare earth, and zirconium products. Generally, the process consists of an initial sulfate roast followed by a series of hydrometallurgical unit operations designed to separate and purify the desired components into commercially usable products, such as tantalum and/or niobium in the form of metal oxides, M2 O5 ; uranium in the form of yellowcake; thorium oxalate; zirconium oxide; and rare earth sulfates.Other References
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