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격막형 액막에 의한 우라늄 회수에 관한 연구

A Study on the Recovery of Uranium by the Supported Liquid Membrane

HWAHAK KONGHAK, April 1986, 24(2), 129-135(7), NONE
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Abstract

담체로 D2EHPA를 함유한 격막형 액막을 이용하여 수용상 중의 우라늄 회수시의 물질전달 기구와 이에 영향을 주는 변수에 대해 조사하여 보았다.
D2EHPA의 농도와 수용상 중의 pH가 커질수록 전체물질전달 저항 중에 추출계면 측의 수용상경계층의 확산저항이 차지하는 비율이 증가하며 추출반응 저항과 액막의 확산저항이 차지하는 비율은 작아진다. 이때 역추출시의 저항은 거의 무시할 만큼 작음을 알 수 있었다. D2EHPA의 농도가 0.05 M, pH가 2.5 이상에서는 수용상의 교반속도가 일정할 때 전체물질전달 이동속도가 거의 일정함을 알 수 있었다. 또한 계의 온도가 높아지면 막으로부터 유기용매의 손실이 심해짐을 알 수 있었다.
Mass transport mechanism and the effect of variables for uranium recovery from aqueous solution by a supported liquid membrane containing D2EHPA as a carrier were investigated. As concentration of D2EHPA as well as pH increased, the portion of mass transport resistance of diffusion through aqueous boundary layer on the extraction interface of membrane in total resistance increased while the portion of chemical reaction resistance of extraction and diffusion through membrane relatively decreased. The portion of stripping resistance, however, was found to be negligible in above both cases.
Above 0.05 M of D2EHPA and 2.5 of pH in aqueous phase, the uranium transport rate was nearly constant at the given stirring speed. As temperature of system increased, loss of solvent from membrane became serious.

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