Nitric acid process for ferric sulfate production
US5624650A · kind A · utility
2Cited by
8References
38Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1996 |
| Grant date | Apr 29, 1997 |
| Priority date | — |
| Expiry date | Feb 22, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01G49/14
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Ferric sulfate is produced by treating ferric ammonium sulfate, ammonium jarosite or a similar iron complex with nitric acid. The ferric ammonium sulfate or ammonium jarosite can be formed by treating a sulfuric acid leaching solution, e.g., a solution used to leach zinc or copper ore concentrate, with a solution of ammonium nitrate. Thereafter, upon addition of dilute nitric acid at a temperature of about 60.degree. C., ferric sulfate forms and is recovered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.