FIELD: metallurgy.
SUBSTANCE: invention relates in particular, to the extraction of fluorine from stale sludge of aluminium production and can be used in enterprises producing primary aluminium. Stale sludge is treated with a solution of caustic soda at a temperature of 60-80°C with a 2.0-2.4% solution of caustic soda with constant stirring for 90-120 minutes under the action of ultrasound.
EFFECT: increased degree of extraction of fluorine into solution.
1 cl, 6 ex
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