METHOD OF PRODUCING GRANULAR CALCIUM CHLORIDE Russian patent published in 2009 - IPC C01F11/24 C01F11/30 B01J2/16 

FIELD: chemistry.

SUBSTANCE: invention relates to production of granular calcium chloride, which can be used in communal and road facilities. The method of producing granular calcium chloride involves preparation of a concentrated solution of calcium chloride from evaporated clarified still waste liquid from ammonia-soda production and subsequent dehydration and crystallisation. Non-ionic surfactant is added to the clarified still waste liquid and then evaporated to concentration of calcium chloride of 35-45%, after which it is taken for dehydration and crystallisation in a boiling-spouting drier-granulator. The spouting bed in the drier-granulator is created by a stream of furnace gases, fed through a central inlet at a rate of 50-55 m/s at temperature 700-750°C, and the boiling bed is created by an air stream at temperature 20-60°C, which is fed at a rate of 3-5 m/s.

EFFECT: intensification of the drying process, recycling still waste liquid, obtaining granular calcium chloride.

6 cl, 1 dwg, 1 tbl