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AssigneeCabot Corporation
InventorsPatrick M. Brown, Rong-Chein R. Wu, Raymond C. Pedicone, Michael G. Madara
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A process for producing valve metal oxides, such as tantalum pentoxide or niobium pentoxide with a narrow particle size distribution within a desired particle size range, is provided. According to the process of the present invention, the valve metal fraction from digestion of valve metal material containing ore is processed under controlled temperature, pH, and residence time conditions to produce the valve metal pentoxide and pentoxide hydrates. Also, disclosed are new tantalum pentoxide and niobium pentoxide products and new tantalum pentoxide precursors and niobium pentoxide precursors.
A process for producing a valve metal pentoxide comprising:
A calcined niobium pentoxide powder characterized by having:
A calcined niobium pentoxide powder characterized by having:
A calcined tantalum pentoxide powder characterized by having:
A calcined tantalum pentoxide powder characterized by having:
A valve metal pentoxide precursor characterized by having a line broadened d-value under x-ray analysis at:
A process for producing valve metal pentoxides comprises:
Dependencies are inferred from the claim text.