Process for the recovery of tantalum values
US4495158A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 29, 1984 |
| Grant date | Jan 22, 1985 |
| Priority date | — |
| Expiry date | Feb 29, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22B34/24
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Tantalum is recovered from an impure source containing niobium, tungsten, titanium, iron, and other impurities by a process comprising mixing the impure source with an alkali metal carbonate, drying the resulting mixture, heating the dried mixture to convert the tungsten to a soluble form, leaching to solubilize the tungsten, digesting the resulting leached solids containing tantalum in hydrochloric acid to solubilize iron values and a portion of the titanium values, dissolving the leached solids containing tantalum values in hydrofluoric acid, adjusting the pH of the resulting solution to form a first tantalum precipitate, dissolving the first tantalum precipitate in oxalic acid adjusting the pH to form a second tantalum precipitate, dissolving and digesting the second tantalum precipitate in hydrochloric acid solution to form a third tantalum precipitate of high purity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.