Energy conserving process for manufacturing ferric sulfate
US3954953A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1974 |
| Grant date | May 4, 1976 |
| Priority date | — |
| Expiry date | Jul 31, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/129
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A continuous process for producing granular ferric sulfate significantly reduces manufacturing time, increases product output through the elimination of the curing stage employed in batch-type processes, and because of reduced heat requirements consumes less energy during the final drying phase. At the initial aqueous phase of the process a low water-containing slurry or dispersion of iron oxide is reacted with only a portion of the total sulfuric acid required in the process to produce a ferric sulfate-containing slurry having unreacted iron oxide. That quantity of acid withheld from the aqueous phase is employed at the time of agglomeration of the ferric sulfate-containing slurry. By delaying use of the remaining acid to a later step in the process the heat of reaction generated from the conversion of the unreacted iron oxide in the slurry may be utilized for completing the reaction and for drying the granules. Thus, drying time is shortened and the consumption of supplemental fuel is greatly reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.