The invention discloses a technology for producing
sodium fluosilicate. The technology comprises the following steps of 1, preparing a
sodium sulfate solution having the
mass content of 26 to 32%, 2, adding fluosilicic acid having the
mass content of 8 to 14% into the
sodium sulfate solution with stirring, 3, controlling a use amount of the
sodium sulfate solution, adjusting a use amount of fluosilicic acid so that compared with a theoretical use amount calculated by a
chemical equation, the use amount of fluosilicic acid is increased by 3 to 6%, 4, carrying out
crystallization after a reaction of
sodium sulfate and fluosilicic acid, 5, washing, separating
sodium fluosilicate crystals, and carrying out centrifugal
drying, and 6, recovering
sulfuric acid and fluosilicic acid. The technology reduces unit consumption of
sodium sulfate, reduces sodion content of
sewage and realizes
recovery of
sulfuric acid in the
sewage. Compared with the prior art, the technology has high efficiency, is
environmentally friendly, simple and convenient, and has
low salt consumption and a low cost.
Sewage produced by the technology for producing
sodium fluosilicate can be directly recovered and used.