Process for producing niobium and tantalum compounds
US6338832B1 · kind B1 · utility
7Cited by
36References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 12, 1995 |
| Grant date | Jan 15, 2002 |
| Priority date | — |
| Expiry date | Oct 12, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B2075/125
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.