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Report No.
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Effect of solid impurities on crystal purification performance in uranium crystallization system

Takeuchi, Masayuki ; Yano, Kimihiko ; Sambommatsu, Yuji; Shibata, Atsuhiro  ; Washiya, Tadahiro ; Nagata, Masanobu*; Chikazawa, Takahiro*

In an uranium crystallization system, a great part of uranium in dissolver liquor with high heavy metal concentration is separated by cooling as uranyl nitrate hexahydrate (UNH) crystal. However, the purity of UNH crystal is not high, so we have discussed the application of crystal purification technology to improve the purity of UNH crystal. In this study, the effects of grain size and density of solid impurities on the purification performance were evaluated in UNH crystal purification tests to discuss the purification mechanism of KCP. From the results, a decontamination factor of smaller grain size of solid impurities was larger than that of bigger one, on the other hand, the density effect was not significant. It is explained that the smaller size of solid impurities is easy to pass through between UNH crystal grains and the decontamination of the solid impurities in the purifier is promoted by pushing down them along the flow of melt.

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