Addition of organophosphonates for size control of wet calcium-b

Details Addition of organophosphonates for size control of wet calcium-b Addition of organophosphonates for size control of wet calcium-b

1991-05-07

1993-09-21

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

4232422, 4232423, 4232427, 423555, C01B 1700, C01B 1720, C01B 1722

Patent

active

052466779

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.

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