METHOD OF BUILDING ARTICLE MAKING Russian patent published in 1995 - IPC

FIELD: building industry. SUBSTANCE: method of processing fluoroanhydrite waste in hydrogen fluoride production to the binder involves detoxication of fluoroanhydrite, mixing with mineral additions and water following by building article forming. Method involves detoxication of fluoroanhydrite at 280-350 C and mixing with β-calcium sulfate semihydrate at the mass part of latter in the mixture 50-90% Then portland cement is added to the prepared mixture at concentration 1.2-3.5% of solid component mass. Time of binder prepared hardening, min; beginning 14-16, the end 17-21. Compression limit strength after 7 days is 92-95 kgf/cm². EFFECT: simplified method of process. 2 cl, 2 tbl