SILICON DIOXIDE-BASED SOLS Russian patent published in 2014 - IPC C01B33/141 D21H21/10 

FIELD: chemistry.

SUBSTANCE: invention can be applied in chemical and pulp and paper industry. Silicon-dioxide-based sol has concentration of soluble silicon dioxide is lower than approximately 800 mg of SiO₂/l, SiO₂ content at least 3 wt %, electric conductivity at least approximately 2.0 mS/cm and S-parameter is lower than approximately 50%. Method of obtaining silicon dioxide-based sol includes processing of aqueous solution of alkali metal silicate by electrodialysis with further acidification of electrodialysed sol to pH from approximately 5.0 to approximately 10.

EFFECT: silicon dioxide-based sol is applied as flocculant, as well as additive in paper production.

14 cl, 8 tbl