FIELD: metallurgy.
SUBSTANCE: method includes grinding of lining, processing with aluminium sulfate, heat treatment, leaching, phase separation. Aluminium sulfate is fed in an amount required according to stoichiometry to bind sodium to sodium sulfate, heat treatment is carried out at a temperature of 300-700°C, the resulting cake is leached with water, the products are separated to produce fluorine-alumina concentrate, a carbon product and a solution containing sodium sulfate.
EFFECT: obtaining a return fluorine-containing product of high quality with low sodium content.
4 cl; 1 ex
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