Method for making a highly pure tantalum compound

Details Method for making a highly pure tantalum compound Method for making a highly pure tantalum compound

1997-09-12

2000-01-04

Nguyen, Ngoc-Yen

Chemistry of inorganic compounds

Halogen or compound thereof

Plural metal or metal and ammonium containing

423592, 423 63, 423 65, 423 66, C01G 3502, C01G 3500

Patent

active

06010676&

ABSTRACT:
Highly pure tantalum compounds are made by slurrying hydrated ammonium tantalum oxide or tantalum hydroxide with concentrated sulfuric acid followed by dissolution with concentrated hydrofluoric acid. After diluting the concentrated acidic solution with water, a soluble potassium compound is added to precipitate a highly pure potassium fluorotantalate. Further steps are used to convert the highly pure potassium fluorotantalate into a highly pure tantalum oxide.

REFERENCES:
patent: 3117833 (1964-01-01), Pierret
patent: 3712939 (1973-01-01), Capps et al.
patent: 3907976 (1975-09-01), Hogen, Jr. et al.
patent: 4041138 (1977-08-01), Glaeser et al.
patent: 4446115 (1984-05-01), Endo et al.
patent: 4537750 (1985-08-01), Ritsko et al.
patent: 4663130 (1987-05-01), Bergman et al.
patent: 4673554 (1987-06-01), Niwa et al.
patent: 4942024 (1990-07-01), Sasaki et al.
patent: 5635146 (1997-06-01), Singh et al.
Nassau et al, Quenched Metastable Glassy and Crystalline Phases in the System Lithium-Sodium-Potassium Metatantalate, J. Amer. Cer. Soc., 62(1-2), 74-79 (1978) (No month).
Borchers et al., Extractive Metallurgy of Tantalum, Extractive Metallurgy of Refractory Metals,The Metallurgical Society of AIME, 110th AIME Annual Meeting, 95-106 (Feb. 22-26, 1981).
Tantalum, Elements, 12-17 (1992) (no month).
Abstract, Derwent WPI, JP 043298808 A, (1992) (no month).
Bielecki, Use of Ion Exchange Techniques for Production of High-purity Potassium Fluorotantalate, Advances in Extractive Metallurgy, The Institute of Mining and Metallurgy, London, 777-788 (Apr. 17-20, 1967).
Carlson et al., Pure Columbium and Tantalum Oxides by Liquid-Liquid Extraction, Journal of Metals, 472-475 (Jun. 1960).
Droeghkamp et al., Tantalum and Tantalum Compounds, Kirk-Othmer Encyclopedia of Chemical Technology, Third Ed., v.22, 541-565, John Wiley & Sons (1983) (no month).
Baram, Kinetics of Dissolution of Niobium and Tantalum Pentoxides in Hydrofluoric Acid, Journal of Applied Chemistry of the USSR, 38, 2181-2188 (1965) (no month).
Zelikman et al., Chapter III: Tantalum and Niobium, Metallurgy of Rare Metals, U.S. Dept. of Commerce, 99-154 (1966) (no month).

Affiliated with

Also associated with

Rating

Method for making a highly pure tantalum compound does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for making a highly pure tantalum compound, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for making a highly pure tantalum compound will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1070291