FIELD: production of high-purity products. SUBSTANCE: complex niobium and tantalum polymer compounds are used as starting material. They are treated with mixture of sulfuric acid and hydrogen peroxide for extraction of niobium and tantalum to aqueous phase. Niobium and tantalum are hydrolyzed diluting with water. Hydroxides thus obtained are molten together with mixture of sulfuric acid and ammonium sulfate and alloy is leached with water or acid solutions. End product is separated from solution by filtration, drying and heating of sediment. EFFECT: enhanced chemical purity of product; increased output; low cost. 2 ex
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