METHOD OF GYPSUM ARTICLE MAKING Russian patent published in 1999 - IPC

FIELD: building materials. SUBSTANCE: invention relates to the technology of building materials producing and can be used in production of gypsum low-roasting binding agents and articles on said. Method of producing gypsum articles involves preparing the raw mixture, pressing at simultaneous water slaking excess removal. The raw mixture is prepared by mixing the wetted gypsum dihydrate of the following groups: ball natural gypsum, citrogypsum with concentrated sulfuric acid followed by the successive addition of dry quick lime up to preparing the composition containing the following components, wt. -%: gypsum dihydrate, 50-70; H₂SO₄, 10-20; CaO 20-30; and slaking water, up to preparing the paste of normal viscosity. Slaking water is removed up to preparing water-binding ratio 0.3-0.35. Method eliminates stages of autoclave treatment and fine milling. EFFECT: increased strength of gypsum articles, simplified method, decreased energy consumption, improved ecology.