GYPSUM DRYING AND/OR BURNING PLANT Russian patent published in 2008 - IPC C04B11/28 F27B17/00 

FIELD: devices for gypsum dehydration and semihydrate gypsum production.

SUBSTANCE: method involves supplying hot gases to inlet of the first channel; delivering gypsum to inlet of the second channel, which is concentric to the first one; moving gypsum in the second channel by supply screw; providing indirect heat-exchange between gypsum and hot gases; burning gypsum to obtain semihydrate gypsum. Gypsum movement and indirect heat-exchange stages include drying and partial burning gypsum to create semihydrate gypsum. Gypsum burning at the last stage is terminated in bringing gypsum into contact with hot gases. The last burning operation is of pulsed type. Gypsum movement and heat-exchanging stages continue for 30 sec-5 min. Gypsum burning by hot gases is carried out for 1-10 sec. Device for described method realization and ready product are also disclosed.

EFFECT: increased productivity and product quality.

27 cl, 2 dwg, 1 tbl