Liquid ferric sulfate manufacturing process
US7067100B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 2003 |
| Grant date | Jun 27, 2006 |
| Priority date | — |
| Expiry date | Jul 20, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for the production of liquid ferric sulfate from finely-divided ferric oxide, sulfuric acid and water in a closed reaction vessel at temperatures ranging from about 130.degree. C. to about 150.degree. C. and pressures from about 30 psi to about 70 psi. The reaction time ranges from Four to eight hours and produces liquid ferric sulfate having at least 10% trivalent iron. Yield and efficiency are provided by controlling the specific gravity prior to the reaction and by counter current cycling the waste stream from the reaction through the dilution water and use of a polymeric settling agent to remove unreacted iron content from the digester output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.