RAW MATERIAL MIXTURE FOR MAKING GYPSUM ARTICLES AND METHOD OF MAKING SUCH ARTICLES Russian patent published in 2006 - IPC C04B28/14 C04B111/20 

FIELD: manufacture of building materials; manufacture of wall structural materials.

SUBSTANCE: raw material mixture for production of gypsum articles contains ground technogenious calcium sulfate dihydrate, lime and water; technogenious gypsum is used at specific surfaces of 3000 and 9000 cm²/g; used as lime and water is saturated solution of slaked lime at the following ratio of components, mass-%: gypsum at specific surface of 3000 cm²/g, 37.6-41.6; gypsum at specific surface of 9000 cm²/g, 46.4-50.4; saturated solution to content: slaked lime, 0.0135-0.019; the remainder being water. Proposed method of production of gypsum articles includes preparation of raw material mixture by mixing the ground technogenious calcium sulfate dihydrate with lime and water and molding; molding is performed in two stages: at first stage by loading with specific pressure equal to 1/3 of terminal pressure, holding at this pressure for 45-60 s and relieving the pressure to zero; at final stage, by loading with pressure of 30-40 Mpa, holding at this pressure for 2.5-3 min and relieving pressure to zero.

EFFECT: enhanced strength of gypsum articles.

3 cl, 1 tbl, 3 ex