ニオブとタンタルの液液抽出におけるチタンの挙動について

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  • Behavior of Ti in Liquid-Liquid Extraction of Nb and Ta
  • ニオブ ト タンタル ノ エキエキ チュウシュツ ニ オケル チタン ノ キョドウ ニ ツイテ

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The behavior of Ti in liquid-liquid solvent extraction of Ta and Nb using the organic solvent hexone was investigated in the four systems, namely, HF-hexone, HF-HCl-hexone, HF-H2SO4-hexone, and HF-HNO3-hexone. The results obtained can be summarized as follows: (1) By individually measuring the distribution coefficients of Ti, Ta, and Nb in the extracting systems, it was found that Ti can be separated sufficiently from Nb and Ta. (2) The extractability of Ti rose with a rise of mineral-acid concentration at constant HF acidity, and particularly sharply from 4.5 N HCl in HF-HCl-hexone system and from 10.6 N H2SO4 in HF-H2SO4-hexone system, but more gradually with rise of HNO3 concentration or HF concentration in HF-HNO3-hexone and HF-hexone systems. (3) In the limits of HF concentration investigated, the extractability of Ti lowered in the following order: In HF-HCl system>in HF-H2SO4 system>in HF-HNO3 system. (4) The cumulative Ti % in organic extract increased with repetition of extraction operation in HF-HCl, HF-H2SO4 and HF-HNO3. In HF-H2SO4 and HF-HNO3 the weight of Ti extracted in the second extraction, showed the maximum, whereas in HF-HCl system the fourth extraction produced the highest weight of extracted Ti. (5) In general, the extractability of Ti in HF-hexone system was smaller than in the other HF-mineral acid-hexone systems, but in HF-H2SO4 below 1.5NH2SO4, HF-HNO3 below 4.2NHNO3 and in HF-HCl below 0.8 N HCl, in which the HF acidity was 12.75 N, Ti was less extractable than in 12.75 NHF-hexone system, and the coextraction efficiency of Ta and Nb was also larger than in the latter.

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