Addition of organophosphonates for size control of wet calcium-based FGD byproduct solids under forced oxidation conditions
US5246677A · kind A · utility
24Cited by
8References
10Claims
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Key dates
| Filing date | May 7, 1991 |
| Grant date | Sep 21, 1993 |
| Priority date | — |
| Expiry date | May 7, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/61
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for producing large, regularly-shaped crystalline gypsum solids in a wet calcium-based flue gas desulfurization system is provided. A chemical crystal modifier, preferably an organophosphonate, is added to the gypsum-containing solids slurry produced by the FGD process under forced oxidation conditions at an addition level which promotes the formation of large, regular gypsum crystals that are easily dewatered. The dewatered gypsum is useful in producing gypsum-based building products and the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.