Jordan and Hamburg
Method of treating produced gypsum
 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. 
Ruedersdorfer Zement GmbH
C Y C C
C04B Y02W C04B C04B
inventional additional inventional inventional
Helmut Detlef Hans-Juergen Guenter Ellen Paul Wolfgang
Meyer Kunze Hartmann Fietsch Wanzura Clemens Schnelle