PROCESS FOR MANUFACTURING NONANNEALED BUILDING ARTICLES Russian patent published in 1994 - IPC

FIELD: manufacture of nonannealed building articles. SUBSTANCE: a mixture containing 1-3 wt % silicate lump and 97-99 wt % sand is prepared. The silicate lump and 30-50 wt % sand are "jointly comminuted, then mixed with the remainder of sand and flooded with water. The resulting mixture having a water to solid ratio of 0.1-0.12 is used to mold articles at a pressure of 10-20 MPa which are first steamed under atmospheric pressure at 80-90 C, a moisture content of 90-100% for 1-1.5 hr, then dried at 110-120 C for 2-3 hr. When the decorative shape of articles is desired, their surface is subjected to glazing by applying a low-temperature plasma. EFFECT: improved properties of the title products. 2 cl, 2 tbl, 5 dwg