Volatilization of Technetium from Simulated Reprocessing Solutions

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Volatilization behavior of technetium was investigated in order to evaluate the decontamination efficiency of an evaporator for reprocessing waste solutions. The gaseous species of technetium volatilized over HTcO<SUB>4</SUB> solutions had been considered as the mixture of Tc<SUB>2</SUB>O<SUB>7</SUB> and HTcO<SUB>4</SUB>. Estimation of the decontamination efficiency needs to determine whether the dominant gaseous species is Tc<SUB>2</SUB>O<SUB>7</SUB> or HTcO<SUB>4</SUB>. The continuous dis-tillation of dilute HTcO<SUB>4</SUB> solution was carried out and we obtained the purification factor (PF) defined as the concentration ratio of technetium in the concentrate and distillate. The PF was normalized by total pressure, HTcO<SUB>4</SUB> molarity and mole number in 11 solution. The normalized PF was reciprocal to the second power of HTcO<SUB>4</SUB> molarity and was proportional to the activity of water. These findings suggested the dominant gaseous species were Tc<SUB>2</SUB>O<SUB>7</SUB> and volatilization was the dehydration of HTcO<SUB>4</SUB> forming gaseous Tc<SUB>2</SUB>O<SUB>7</SUB>. The vapor pressure of Tc<SUB>2</SUB>O<SUB>7</SUB> was obtained from PF and the equilibrium constant of volatilization reaction was calculated considering that the gaseous species was dominantly Tc<SUB>2</SUB>O<SUB>7</SUB>. The thermodynamic functions con-trolling the volatilization reaction were obtained from the dependence of equilibrium constant on temperature as, ΔH=82.3 kJ•mo;<SUP>-1</SUP> and ΔS=205.4 J•mo;<SUP>-1</SUP>K<SUP>-1</SUP>, respectively.

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  • Journal of nuclear science and technology  

    Journal of nuclear science and technology 33(9), p.728-730, 1996-09-25 

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002075495
  • NII書誌ID(NCID)
    AA00703720
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00223131
  • NDL 記事登録ID
    4060430
  • NDL 雑誌分類
    ZM35(科学技術--物理学)
  • NDL 請求記号
    Z53-A460
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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