Process for the recovery of high purity tantalum oxide
US4490340A · kind A · utility
9Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 29, 1984 |
| Grant date | Dec 25, 1984 |
| Priority date | — |
| Expiry date | Feb 29, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01G35/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process is disclosed for producing a high purity tantalum precipitate from an impure source by dissolving in a first hydrofluoric acid solution and digested to form a first precipitate of tantalum which dissolved in hydrochloric acid. The resulting solution is heated to form a second precipitate of tantalum which is dissolved in another hydrofluoric acid solution and digested to form a third precipitate of tantalum. The third precipitate of tantalum is then dissolved in an oxalic acid solution with the pH being adjusted to form another tantalum precipitate which is converted to tantalum oxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.