FIELD: chemistry.
SUBSTANCE: invention can be used in chemical industry. Method of gypsum calcination includes stages at which: gypsum is introduced into reactor under pressure 27, fuel and air are burnt in burner 41 with formation of gaseous products of combustion. After that, part of gaseous products of combustion and air are supplied to reactor under pressure 27 with creation of fluidised bed of gypsum in reactor. After that, remaining part of gaseous products of combustion is directed into heat exchanger 52, which is applied for heating of fluidised bed and fluidised bed of gypsum is heated in reactor under pressure 27 for sufficient calcination of gypsum with formation of calcinated semihydrate.
EFFECT: invention makes it possible to obtain alpha-semihydrate of calcium sulfate with reduced fuel consumption.
8 dwg, 1 tbl
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