Process for purifying tantalum oxide and other metal oxides

Details Process for purifying tantalum oxide and other metal oxides Process for purifying tantalum oxide and other metal oxides

1996-02-13

1998-01-13

Bos, Steven

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423608, 423609, 423610, C01B 1314, G01G 2300, G01G 3500, G01G 2500

Patent

active

057075999

ABSTRACT:
There is disclosed a process for producing premium grades of metal oxide comprising (1) providing wet or dried hydrous metal oxide containing high levels (e.g., 2%-10% chloride) of halogen contamination, (2) treating the contaminated metal oxide with a base in gas phase, which base is volatile at .ltoreq.900.degree. C., at a final temperature of between 750.degree. C. to no greater than 900.degree. C. wherein the temperature is brought to the final temperature in increments of about 25.degree. C., until gas exiting shows no additional evolution of a halogen conjugated acid, and (3) exposing the treated metal oxide to air or oxygen at a temperature of 500.degree. to 600.degree. C. to convert any metal nitrides or oxynitrides present to metal oxide, wherein the metal oxide is selected from the group consisting of Ta.sub.2 O.sub.5, niobium oxide, hafnium oxide, zirconium oxide and titanium oxide. The inventive process yields a premium grade, high active surface area .beta.-Ta.sub.2 O.sub.5 product with a chloride content that is below detection limits (e.g., .ltoreq.1 ppm-0.2 ppm) and in which the contaminant metals levels are unchanged or diminished from the levels of the hydrous oxide starting material.

REFERENCES:
patent: 2980496 (1961-04-01), Mettler, Jr.
patent: 3000703 (1961-09-01), Brugger
patent: 3133788 (1964-05-01), Kern et al.
patent: 4668501 (1987-05-01), Shibuta et al.
patent: 4741894 (1988-05-01), Melas
patent: 5211921 (1993-05-01), Sommers et al.
Brauer et al., Zeitschrift fur Anorganische und Allgemeine Chemie, 348-298, 1966, no month.

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