Abstract:Research work for the technology of separation of Ta and Nb with extraction by means of secondary octanol-HF-H₂SO₄ system has been conducted. When the material acidity was HF 4 mol/L and H₂SO₄ 4mol/L, the distribution ratios of Ta and Nb were 15·0 and 3·2 correspondingly ,and Ta and Nb were extracted simultaneously into the organic phase; while at a lower acidity ,the sec-octanol system has a stronger extracting power for Ta than for Nb. When the material acidity was HF 1 mol/L and H₂SO₄1.5 mol/L, the distribution ratios of Ta and Nb were 6·85 and 0·032 respectively, and the separation coefficient went up to 214,which resulted in a good separation of Ta and Nb.

Key words: sec-octanol　Ta　Nb　extraction