Recovery of fluoride values from waste materials

Details Recovery of fluoride values from waste materials Recovery of fluoride values from waste materials

1987-11-18

1990-02-13

Russel, Jeffrey E.

Chemistry of inorganic compounds

Halogen or compound thereof

Hydrogen halide

423128, 423166, 423193, C01B 719, C01B 1796

Patent

active

049005359

ABSTRACT:
A process for the treatment of waste materials such as spent cathode liners involving combustion of the contained carbonaceous material, decomposition of the contained cyanides, sulphides and nitrides, and recovery of fluoride values by a sulpholysis reaction, is characterized in that the sulpholysis reaction is carried out in a separate stage. The process enables a recovgery of fluoride values from smelter wastes which is especially favourable environmentally. A further advantage of the invention is that recovery of the contained fluoride values, initially in the form of gaseous fluoride species, may subsequently be treated with alumina to produce aluminium trifluoride, which is of significant economic importance.

REFERENCES:
patent: 4065551 (1977-12-01), Dahl
patent: 4113832 (1978-09-01), Bell et al.
patent: 4158701 (1979-06-01), Andersen et al.
patent: 4160809 (1979-07-01), Anderson et al.
patent: 4355017 (1982-10-01), Gamson et al.
patent: 4444740 (1984-04-01), Snodgrass et al.

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