Purification of FGD gypsum product
US5215672A · kind A · utility
6Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 1, 1992 |
| Grant date | Jun 1, 1993 |
| Priority date | — |
| Expiry date | Sep 1, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01F11/468
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process of purifying the gypsum slurry end product produced by a flue gas desulfurization process which incorporates fine solids separation/classifying, dewatering, mixing, and filtering to both achieve a useful gypsum product and to recycle as much process water as possible to the flue gas desulfurization process. This purification process separates the incoming gypsum slurry into a fine solids stream containing a disproportionate amount of impurities therein that are concentrated and subsequently disposed of and a coarse solids stream containing a large amount of gypsum therein from which a usable gypsum product is recovered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.