METHOD OF RECOVERING FLUORINE FROM FLUORINE-CONTAINING COMPOUNDS Russian patent published in 2000 - IPC

Abstract RU 2155709 C2

FIELD: industrial inorganic synthesis. SUBSTANCE: hydrofluoric acid solution is treated with metasilicate at molar ratio to hydrofluoric acid (1- 1.2): 6. When mixture of hydrofluoric acid with fluorosilicic acid is used, sodium fluoride is first added to solution at molar ratio to fluorosilicic acid 2: 1 and then sodium metasilicate is added, after which solution is stirred for 2 to 6 h at 25 to 60 C. EFFECT: increased recovery of fluorine in the form of high-quality easy-to-filtrate salt Na₂SiF₆. 2 cl, 4 tbl

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RU 2 155 709 C2

Authors

Ol'Shanskij V.A.

Dates

2000-09-10—Published

1998-06-01—Filed