Oxidation of phosphoric acid plus K compound addition
US4301131A · kind A · utility
1Cited by
11References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 28, 1980 |
| Grant date | Nov 17, 1981 |
| Priority date | — |
| Expiry date | Nov 28, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B25/235
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention is directed to an improvement in the Hill phosphoric acid process, whereby the Hill process can be used with high-iron phosphate rock. The improvement involves oxidation of divalent iron in an early stage of the Hill process, followed by addition of a soluble potassium compound to the acid in the crystallizer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.