Method for working up fluorine-containing residues

Details Method for working up fluorine-containing residues Method for working up fluorine-containing residues

C - Chemistry, Metallurgy

01

F

C01F 7/50 (2006.01) C25C 3/08 (2006.01)

Patent

CA 2048520

14 ABSTRACT OF THE DISCLOSURE A method for working up fluorine-containing residues with recovery of aluminum fluoride according to which a mixture of finely particulate fluorine- and carbon-containing residues and SiO2 and SiO2-containing materials is heated in the presence of gaseous chlorine to temperatures between 400° and 900°C with about 98% of the fluoride content of the mixture being converted to gaseous silicon tetrafluoride, and, thereafter, the gaseous silicon tetrafluoride is converted either directly or after a transformation to hydrofluosilicic acid into aluminum fluoride by reaction with aluminum hydroxides or aluminum oxides. (AZ.app.1)

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