BORON-CONTAINING PRECIPITATED SILICA

摘要

There is prepared precipitated silica containing boron and having the following physical-chemical data -Loss on heating Weight % 14-40 -pH 4-6 -Conductivity in 4% aqueous / mu S <800 -dispersion -Bulk density g/l 130 +/- 100 -Sieve residue according to -Alpine >63/ mu Weight % <0.1 -SiO2 content based on original Weight % 9-76 -material -B2O3 content based on original Weight % 10-51 -material -Na2O content based on original Weight % <0.5 -material -So3 content based on original Weight % <0.8 -material - The product is obtained by supplying precipitated silica and ortho boric acid in the ratio of 0.1-3.5:1 continuously to a jet mill and micronizing them together by means of the air of the mill at room temperature.