Process for removing sulfate ions from extracted phosphoric acid employing barium compounds and activated carbon
US4041134A · kind A · utility
3Cited by
7References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 11, 1976 |
| Grant date | Aug 9, 1977 |
| Priority date | — |
| Expiry date | Jun 11, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B25/234
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for removing sulfate ions from extracted phosphoric acid which is substantially free of metallic ion contaminants, which comprises adding less than the stoichiometric equivalent of a barium compound relative to the amount of dissolved sulfate ion to said extracted phosphoric acid to form barium sulfate crystals, adding active carbon to the resulting slurry, separating the solid components from the slurry and recovering purified phosphoric acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.