METHOD FOR PRECIPITATED SILICA PRODUCTION, AND PRODUCT OBTAINED ACCORDING TO THIS METHOD Russian patent published in 2017 - IPC C01B33/18 C01B33/193 C08K3/36 

FIELD: chemistry.

SUBSTANCE: method for precipitated silica production includes feed slurry treatment with a soda solution, acid introduction to produce a silica precipitate, and then separation, washing and drying. Slurry of boronic acid production is used as the feed slurry. Prior to processing with a soda solution, this slurry is enriched to 50-65 wt % of silica content by flotation at pH of 6.8-8.5 and temperature of 30-40°C in the presence of liquid technical soap. The product obtained according to this method contains, wt %: 89-91 SiO₂, 0.05-0.08 Fe₂O₃, 0.02-0.07 Na₂O, 0.1-0.3 SO₄, not more than 0.002 MnO and not more than 0.002 MgO, has a moisture content of 5.2-5.5%, water extract pH of 6.3-6.8 and specific surface of 165-170 m^2/g.

EFFECT: invention allows to improve the quality of the resulting silica.

3 cl, 1 tbl, 2 ex