Abstract
The mass transfer of synergistic extraction of uranium ions from monazite leach solution via HFSLM was examined. Optimum conditions for synergistic extraction were found to be pH 5 in the feed solution, 0.1 M Cyanex 272 + 0.1 M TOPO in the liquid membrane and 2 M H2SO4 in the stripping solution at 30 °C. After a fourth cycle, the cumulative extraction and stripping of uranium ions reached 95% and 90%. Fractional resistance due to extraction reaction proved to be the highest value. This indicated that mass transfer resistance from the extraction was dominant. The controlling step is the chemical reaction.
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