Purification of FGD gypsum product

Details Purification of FGD gypsum product Purification of FGD gypsum product

1992-09-01

1993-06-01

Theisen, Mary Lynn

Liquid purification or separation

Processes

Separating

210749, 210765, 210805, 2105121, B01D 2120

Patent

active

052156729

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.

REFERENCES:
patent: 4203954 (1980-05-01), Asanagi
patent: 4687649 (1987-08-01), Kuroda et al.
patent: 5132027 (1992-07-01), Ukawa et al.

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