METHOD FOR PRODUCTION OF METASILICATE OF LEAD Russian patent published in 1995 - IPC

FIELD: chemical technology. SUBSTANCE: method is carried out by precipitation of desired product. Said precipitation takes place in mixture of aqueous solutions of lead salt and silicium- and oxygen-containing compound followed by isolation by filtration and by heat treatment. Tetralkoxysilanes or their hydrolyzates having pH 8.5-11.0 or 1.5-3.5 are used as mentioned above silicium- and oxygen-containing compounds. Tetralkoxysilanes are mixed with lead salt and are alkalized to pH 7-10, then two-stepped heat treatment is carried out. The first step takes place at 150-170 C within 6-10 h, at the second step heating to 500-550 C at rate 10-20 C/h is carried out. EFFECT: improves efficiency of method. 3 cl, 1 tbl