By International Atomic Energy Agency
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Extra info for Production of Yellow Cake and Uranium Fluorides (Panel Proceedings)
E. between 10 and 20°C. Third, the uranium concentration in the effluent increases between two successive alkaline washings of the resin. This variation can be seen in the table below, which shows the average uranium content in the effluent for four-day loading operations, between two successive regenerations of the resin. 3 A. 1 g of U 3 0 8 /ltr. If this were completely eluted from the resin by using four bed volumes of the recycling eluant, the result would be an eluate of between 325 and 775 ppm U 3 0 8 .
The behaviour of molybdenum appears to closely resemble that of silica and may be removed in the same way. Cobalticyanide poisoning was a problem for a number of the first generation uranium plants on South African mines. With the renewed interest in ion-exchange processes for the recovery of uranium from gold tailing slimes dams, the subject of cobalticyanide poisoning has been re-investigated. It has been proved  that the ionic species responsible for the permanent poisoning of resin is (Co(CN)5OH2)2~.
If the rate of organic pick-up is very high, then a nitrate elution will remove both uranium and the organic species to the concentrated eluate which may be subjected to a further stage of purification, by, for example, the selective precipitation of uranium by hydrogen peroxide. However, organic fouling is best avoided if possible by absorption of these compounds on activated charcoal before ion exchange. 4. Elution Table VI summarizes a number of conditions of elution that have been found to be satisfactory in large-scale operation.