Process of refining sodium hexafluorosilicate

Details Process of refining sodium hexafluorosilicate Process of refining sodium hexafluorosilicate

C - Chemistry, Metallurgy

01

B

23/172

C01B 33/10 (2006.01)

Patent

CA 1087370

ABSTRACT OF THE DISCLOSURE Crude sodium hexafluorosilicate containing gypsum and various metal phosphates is refined into highly pure and sufficiently large crystals. First, the crude fluorosilicate is treated with a sodium chloride solution to dissolve gypsum. Then the solid phase is reconsti- tuted into an aqueous slurry in which the concentration of Na is limited. This slurry is acidified and maintained at temperatures not lower than 80°C with continued stirring to cause recrystallization of sodium hexafluorosilicate. - 1 -

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