An Ion Exchange Unit for Radiochemical Separation

Gas Formation in Anion Exchange Resin Beds

“…After a short interval to allow reduction of the actinides, the solution is heated to 55°C for 30 minutes. Only a small fraction of the ferrous ion is normally required to reduce the actinides; therefore, the heat treatment oxidizes the major portion of the remaining ferrous ion: 13 , 41 ( 1) When one liter of 0.05M Fe2+ is oxidized, 0.025 mol of HN0 2 is produced, 0.025 mol of sulfamic acid is consumed, and 560 cc (STP) of nitrogen gas are produced: ( 2) Approximately the predicted quantity of gas was released during the heating of synthetic process solutions with efficient agitation. Mass spectrometric analysis confirmed that the gas was mostly nitrogen.…”

“…The gas that accumulates in the bed is difficult to remove and causes channeling and reduction in flows, Gas accumulation is particularly troublesome with unrestrained beds of resin, which are used in some processes. ( 2 ) In the work described in this report, the composition of the gas formed from feeds treated with ferrous sulfamate and the mechanism of gas formation were first investigated. Methods for reducing or eliminating gas formation were then tested.…”

Ion Exchange Process for the Recovery of PU238 from Irradiated NP237

“…This paper describes the chemical development of the ion exchange process. Other communications have described the main features of the remote chemical processingequipment (3). the performance of the process during about 2 years of plant operation (7).…”