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- W280365706 abstract "Laboratory experiments on /sup 235/U enrichment processes based on column redox ion exchange, electrodialysis, and gas exchange chromatography performed from August 1972 to September 1974 are summarized. Effluent from a 50 to 50 weight mixture of U/sup +4/ and U/sup +6/ (as UO/sub 2//sup 2 +/), at a total uranium concentration of 5 mg U per ml in 0.25N H/sub 2/SO/sub 4/-0.03N NaF solution, passing through a 100 cm length cation exchange column at 0.5 ml/min flow rates, was enriched in /sup 235/U by 1.00090 +- .00012. The enriched fraction was mostly in the +6 valence form while the depleted fraction was U/sup +4/ retained on the resin. At flow rates of 2 ml/min, the enrichment factor decreases to 1.00033 +- .00003. In the electrodialysis experiments, the fraction of uranium diffusing through the membranes (mostly as +6 valence state) in 4.2 hours is enriched in /sup 235/U by 1.00096 +- .00012. Gas exchange chromatography tests involved dynamic and static exposure of UF/sub 6/ over NaF. In dynamic tests, no significant change in isotopic abundance occurred in the initial one-half weight cut of UF/sub 6/. The measured relative /sup 235/U//sup 238/U mole ratios were 1.00004 +- .00004 for these runs. Inmore » static runs, enrichment became evident. For the NaF(UF/sub 6/)/sub x/-UF/sub 6/ system, there is /sup 235/U depletion in the gas phase, with a single-stage factor of 1.00033 at 100/sup 0/C and 1.00025 at 25/sup 0/C after 10 days of equilibration. The single-stage or unit holdup time is impractically long for all three chemical processes. (DLC)« less" @default.
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- W280365706 date "1976-07-28" @default.
- W280365706 modified "2023-09-23" @default.
- W280365706 title "Laboratory studies of /sup 235/U enrichment by chemical separation methods. [Ion exchange, electrodialysis, gas exchange chromatography]" @default.
- W280365706 doi "https://doi.org/10.2172/7334984" @default.
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