Method of treating produced gypsum

Details Method of treating produced gypsum Method of treating produced gypsum

1991-02-12

1992-12-08

Straub, Gary P.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423171, 423172, 423176, 106705, 106775, 106786, 106782, C01F 1146, C04B 1102

Patent

active

051696177

ABSTRACT:
A method for treating produced gypsum and, in particular, a method for treating flue-gas desulfurization gypsum forms highly active, modifiable gypsum binders of high strength with simultaneously drying, deagglomerating and dehydrating. Pursuant to the invention, produced gypsum (flue-gas desulfurization gypsum), with a particle size ranging up to 200 .mu.m, to which 10% by weight of milled natural gypsum is optionally added, is dehydrated at a material temperature of 335.degree. to 363.degree. K. and at a pressure ranging from 2.5 to 8 kpa, the dehydration being concluded when anhydrite III constitutes 50% to 100% by weight.

REFERENCES:
patent: 383957 (1888-06-01), Leffmann
patent: 801874 (1905-10-01), Hirt
patent: 3650689 (1972-03-01), Cafferata
patent: 3789111 (1974-01-01), Chaurand et al.
patent: 4247518 (1981-01-01), Charlot et al.
patent: 4581830 (1986-04-01), Risenby et al.
patent: 4748010 (1988-05-01), Walker

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