METHOD FOR PRODUCTION OF SODIUM SILICOFLUORIDE Russian patent published in 2016 - IPC C01B33/10 

FIELD: technological processes.

SUBSTANCE: invention relates to production of sodium silicofluoride. Method for producing sodium silicofluoride involves reaction of hydrogen fluorosilicic acid and a mixture of sodium-containing compounds, which are taken in an amount of 110-120 % of stoichiometric ratio. Reaction is carried out at a temperature of 0-50 °C during 15-30 minutes to obtain a suspension, product is separated by settling, it is followed by decantation of mother solution, derived slurry is diluted with water, precipitate is filtered and dried. Mixture of sodium-containing compounds used are a mixture of sulphate and sodium carbonate taken at a weight ratio of Na₂SO₄:Na₂CO₃, equal to (3.2-3.9):1, in the form of 15-20 % solution. Mixture of sodium-containing compounds can be a sulphate-soda mixture, which is a waste product of alumina production.

EFFECT: technical result consists in improvement of quality of the end product.

3 cl, 1 tbl, 2 ex