FIELD: chemistry.
SUBSTANCE: invention can be used in the production of building materials. The method of modifying gypsum dihydrate involves a step of forming a semihydrate on which crude gypsum dihydrate is calcined to gypsum semihydrate, and recrystallisation step on which the gypsum semihydrate is hydrated and recrystallised in an aqueous suspension to modified gypsum dihydrate. At the recrystallisation step, the aqueous suspension is held in the reaction vessel at constant temperature while stirring such that the aqueous suspension becomes homogeneous. Feeding of the gypsum semihydrate and outputting the recrystallised and modified gypsum dihydrate is carried out continuously or intermittently.
EFFECT: invention enables to obtain modified gypsum dihydrate, having mean particle size of at least 64 mcm and purity of 95% or higher.
16 cl, 5 dwg, 2 tbl, 17 ex
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