Preliminary Study on Preparation Method of Spherical AUC Crystal

The influences of the composition of precipitant, stirring rate and supersaturation level on AUC crystal are studied. It is found that AUC crystal with a stoichiometrical compound presented by formula (NH 4) 4UO 2(CO 3) 3 can be obtained in the case of n (CO 2- 3)/ n (U)>3 and n (NH + 4) / n (U) >6. The supersaturation level of precipitant influence greatly on the size and shape of AUC crystal. When the supersaturation level of precipitant is lower, the size of AUC crystal is larger and the ratio between length and diameter of AUC crystal is larger and the fluidity of AUC crystal is worse. When the supersaturation level of precipitant is higher, since AUC crystal habit is changed and AUC crystal grow in all direction, the AUC crystal can be sphericized._