弗酸-TBP系の液々抽出によるタンタルとニオブの抽出分離について

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  • Extraction and Separation of Tantalum and Niobium by Liquid-Liquid Extraction in Hydrofluoric Acid-Tributyl Phosphate System
  • フツサン-TBPケイ ノ エキエキ チュウシュツ ニ ヨル タンタル ト ニオブ ノ チュウシュツ ブンリ ニ ツイテ

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In this report the liquid-liquid solvent extraction and separation of Ta and Nb by using tributyl phosphate (TBP) as an organic solvent and hydrofluoric acid solution as a aqueous solution was studied. The extractability of a fluoride complex of Ta and Nb from HF solution into TBP was found to be a function of HF acidity, TBP concentration, oxide concentration, organic solvent ratio, and number of extraction operation. The results obtained can be summarized as follows: (1) %Ta extracted and Ta distribution coefficient decreased with an increase of HF acidity at constant TBP concentration, but decreased with a decrease TBP concentration at constant HF acidity. %Nb extracted and Nb distribution coefficient rose with a rise of HF acidity and TBP concentration. (2) The separation factor augmented with diminishing HF acidity, especially under 3NHF. (3) Both %Ta and %Nb extracted fell in opposition to rising oxide concentration in aqueous solution. (4) Increase in solvent ratio and number of extraction operation caused increase of both %Ta and %Nb extracted. (5) The organic extract made with by TBP included little impurity. (6) HF-TBP system had larger extraction efficiency of Ta and Nb, particularly in low HF acidity, better separation factor and higher purity of organic extractive and separative system in liquid-liquid extraction of Ta and Nb at present.

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