METHOD FOR PRODUCING GYPSUM BINDER Russian patent published in 2017 - IPC C04B11/28 C04B18/04 

FIELD: chemistry.

SUBSTANCE: invention relates to production of composite binders on the basis of gypsum and mineral admixtures, and may be used for the manufacture of interior decoration materials. The method for producing gypsum binder comprises joint mechanical activation of calcium sulphate dihydrate and nepheline-containing additive at a ratio of 1:0.43-4.0. Nepheline concentrate or apatite-nepheline ore processing waste is used as a nepheline-containing additive with a nepheline mass content of 75-80 or 50-55%. Mechanical activation is carried out in a planetary mill for 2-5 minutes at a power supply rate of at least 5 kJ/s per 1 kg of mix to achieve binder specific surface area of 900-1300 m²/kg.

EFFECT: method for producing a cheaper and more environmentally friendly binder, with improved compression strength.

3 cl