FIELD: hydro metallurgy of rare-earth metals; extraction of lithium from technological solution at high concentration of hydrofluoric acid. SUBSTANCE: lithium is sedimented due to introduction of potassium in the amount of 17 to 120 g/l and or iron or iron compound in the amount of 14 to 100 g/l in items of iron into the potassium hydrofluoride solution. Methods ensures extraction of lithium at content of hydrofluoric acid up to 25%. Degree of extraction is equal to 99.7%. EFFECT: enhanced efficiency. 3 tbl, 3 ex
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