Behavior of Sn in Liquid-Liquid Extraction of Nb and Ta

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  • ニオブとタンタルの液液抽出における錫の挙動について
  • ニオブ ト タンタル ノ エキエキ チュウシュツ ニ オケル スズ ノ キョドウ ニ ツイテ

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The behavior of the impurities, Sn, Ti, Fe, Si etc., in liquid-liquid solvent extraction of Ta and Nb with organic solvent is very important in the production of high purity Nb and Ta. The authors investigated the behavior of Sn in four systems of Ta and Nb solvent extraction, namely, with HF-hexone, HF-HCl-hexone, HF-H2SO4-hexone, and HF-HNO3-hexone. The results obtained can be summarized as follows: (1) By measuring the distribution coefficients of Sn, Ta, and Nb in each extractive system, it was found that Sn can be separated sufficiently from Nb and Ta. (2) The extractability of Sn heightens with a rise of mineral acid concentration in a constant HF acidity, especially, from 3.5 N HCl in HF-HCl-hexone system and from 7 N H2SO4 in HF-H2SO4-hexone system, while it gradually increases with a rise of HNO3 concentration or HF concentration in HF-HNO3-hexone system and HF-hexone system. (3) In a constant high HF acidity, 12.75 N, it decreases in the following order: HF-HCl system >HF-H2SO4 system>HF-HNO3 system. (4) Sn% of total organic extract rises with increasing number of times of extracting operation in HF-H2SO4 and especially in HF-HCl, but Sn% of four-times operated extract in HF-HNO3 was lower than that of three-times operated extract. In both HF-H2SO4 and HF-HNO3, the weight of Sn extracted a maximun in the second extraction, while the weight of extracted Sn in HF-HCl system increases with increasing number of extracting operations. (5) HF-hexone system is usually less efficient in extracting Sn than other HF-mineral acid-hexone systems, but HF-H2SO4 below 2.0 N H2SO4, HF-HCl below 0.65 N HCl, and HF-HNO3 below 2.7 N, in which HF acidity is 12.75 N, have similar efficiency in of Sn extraction as 12.75 N HF-hexone system and have larger coextraction efficiency of Nb and Ta than does the latter.

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