RAW MIXTURE FOR MODIFIED CITROGYPSUM ARTICLES AND METHOD OF THEIR PRODUCTION Russian patent published in 2019 - IPC C04B28/14 C04B14/04 C04B18/04 C04B40/00 C04B11/02 C04B111/20 

FIELD: construction.

SUBSTANCE: present invention relates to production of construction materials and can be used in production of gypsum articles. Raw mixture for articles from modified citrogypsum contains binder, fine aggregate and water, wherein the binder used is a modified gypsum binder obtained by burning citrogypsum, a composition, wt%: CaO – 29.7–31.5, SO₃ – 44.0–45.5, SiO₂ – 0.3–1.2, MgO – 0.1–0.4, loss on ignition – rest, in rotary furnace at temperature of 120–140 °C, with specific surface area of 600–650 m²/kg, as fine filler – wastes from perlite production – pearlite dust with granule size 5–100 mqm, bulk density – 75 kg/m³ at following weight ratios, %: modified citrogyps – 83; pearlite dust – 1.5; water – 15.5. Method of making articles involves mixing perlite dust with water, adding modified citrogypsum, stirring, molding in molds under pressure of 10 MPa, with holding products at said pressure of 30 s.

EFFECT: high strength of articles from modified citrogypsum.

2 cl, 3 tbl