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Report No.
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The Study of the super-saturated concentration of UNH solution

Yamasaki, Kazuhiko*; not registered; Tamaki, Yoshihisa*

Crystallization procedure is considered to have an adaptability to new reprocessing process based on the PUREX process because it has an advantage in recovering rather pure uranium from contaminated uranium solution without any reagents. Up to now, a small-scale uranium test has been performed to confirm an applicability of crystallization. We have a suggestion to increase the amount of product from crystallization procedure. Firstly, we keep the UNH solution at the first degree of super-saturated concentration before crystallization. While keeping the degree, primary nucleation progresses in the solution. This treatment will increase the amount of UNH crystal from the solution by the time. Our other suggestion is to increase the decontamination factor of product. For this purpose, we should restrain secondary nucleation due to increase the size of UNH crystal. If the UNH solution is kept at degree between saturated and super-saturated concentration, it would cause to increase the size of UNH crystal while crystallizing. In this study, we estimate the degree of super-saturated concentration of UNH solution concerning the reprocessing process.

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