FIELD: metallurgy.
SUBSTANCE: processing method for spent carbon-containing lining of aluminium electrolytic cell involves lining grinding, leaching with aqueous solution of sodium hydrate, separation of liquid and solid phases of the pulp, solution treatment with extraction of fluorine product. Grinding of spent carbon-containing lining is performed in water at pH = 6-8 and temperature up to 60 °C. Further, the pulp is processed with sodium hydrate solution at 80-100 °C for 4-10 hours at pH = 10-12. After phase separation, the solution is treated with an acid and/or salts.
EFFECT: obtainment of high-quality return fluorine-containing product.
5 cl, 1 tbl, 1 ex
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