Process for recovering tantalum and/or niobium compounds from composites containing a variety of metal compounds
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United States of America Patent
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Jul 28, 1998
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N/A
app pub date -
Sep 26, 1996
filing date -
Sep 26, 1996
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Expired
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Abstract
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 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, M.sub.2 O.sub.5 ; uranium in the form of yellowcake; thorium oxalate; zirconium oxide; and rare earth sulfates.
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