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Separation of Th^(4+) and RE^(3+) with Hollow Fiber Extraction
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作者 Wang, Yujie Zhang, Shumin Li, Deqian 《Journal of Rare Earths》 SCIE EI CAS CSCD 1999年第2期9-13,共5页
Separation of Th4+ and RE3+ was investigated by hollow fiber membrane extraction with N1923 in countercurrent recirculating operation. The effect of H+ concentration in aqueous phase and flow rates of aqueous and orga... Separation of Th4+ and RE3+ was investigated by hollow fiber membrane extraction with N1923 in countercurrent recirculating operation. The effect of H+ concentration in aqueous phase and flow rates of aqueous and organic phases on mass transfer coefficient was tested. Then the extraction of Th4+ from RE sulfate obtained from Baotou ore was carried out. The results obtained show that the mass transfer coefficient of Th4+ changes with the flow rate of aqueous phase, but does not change with the flow rate of organic phase and H+ concentration in aqueous phase, which suggests that the mass transfer rate of Th4+ is controlled by that in the water critical layer. The mass transfer rate of RE3+ does not change with the flow rate of water phase, changes a little with the flow rate of organic phase, and changes with H+ concentration, which suggests that the mass transfer rate is controlled by their reaction rate with N1923. Th4+ could be extracted completely in 8 h from RE sulfate solution of Baotou ore withrelatively less extraction of RE3+. So the separation of radioactive element under the sealed condition could be done. 展开更多
关键词 Rare earths THORIUM Hollow fiber membrane EXTRACTION Amine N1923
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