CRUDE MIXTURE FOR PRODUCING GYPSUM BINDER AND ARTICLES FROM SAID BINDER Russian patent published in 2011 - IPC C04B11/26 C04B28/14 C04B111/52 

FIELD: chemistry.

SUBSTANCE: invention relates to the technology of producing building materials, more specifically to a crude mixture for producing gypsum binder and articles made from gypsum binder, which can be used in producing construction materials for making low- and medium-grade strength small pieces of wall blocks, partitioning slabs and lintel blocks. The crude mixture for producing gypsum binder and articles from gypsum binder contains the following in wt %: dihydrate of phosphogypsum 70-78, filler 19-27.5, unslaked lime 1.4-1.9, water - the rest. The crude mixture can contain dihydrate of phosphogypsum in form of wastes from production of wet-process phosphoric acid with natural specific surface area of 3500-4500 cm²/g and natural moisture content of 30-35%. The crude mixture can contain filler with specific surface area of 4500-5000 cm²/g in form of slag-ash wastes or blast-furnace slag, or screenings of gypsum or limestone chips.

EFFECT: improved soundproof properties.

3 cl, 3 ex