METHOD FOR PRODUCTION OF GYPSUM BINDER Russian patent published in 1995 - IPC

FIELD: building materials production. SUBSTANCE: proposed binder is prepared by boiling borongypsum, the process is carried out in autoclave. Before boiling suspension of silicate bacteria, namely Bacillus mucilaginosis is added into suspension of borongypsum, its quantity being 10-40 ml per 1 l of borongypsum suspension. Thus prepared precipitate of borongypsum is dehydrated on vacuum filter, dried and briquetted, said processes are carried out in 2.0-2.5 h. Mentioned above autoclave treatment takes place by increasing pressure to 1.3 atm within 0.5 h, isothermic seasoning at said pressure being 3 h. then pressure is drop within 0.5 h. Compressive strength in 2 h after forming is 10.8-14.2 MPa, bending strength being 4.9-6.3 MPa. EFFECT: improves efficiency of the method. 2 tbl