Addition of organophosphonates for size control of wet calcium-based FGD byproduct solids under inhibited oxidation conditions
US5246679A · kind A · utility
18Cited by
12References
11Claims
0Family size
Assignee
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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 primaryC01F11/48
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for producing large, regularly-shaped crystalline calcium sulfite solids in a wet calcium-based flue gas desulfurization system is provided. A chemical crystal modifier, preferably an organophosphonate, is added to the calcium sulfite-containing solids slurry produced by the FGD process under inhibited oxidation conditions at an addition level which promotes the formation of large, regular calcium sulfite crystals that are easily dewatered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.