Behavior of Plutonium(IV) and Neptunium(IV) at Acidification of Spent Carbonate Solutions Prior to Extraction

摘要

The precipitation of poorly soluble Pu(IV) and Np(IV) dibutyl phosphates on acidifying Pu(IV)- and Np(IV)-containing carbonate solutions contaminated with dibutyl hydrogen phosphate was studied. The degree of precipitation of Pu and Np is dependent on the final acidity and the storage time of the resulting suspension. The presence of iron in carbonate solutions (<0.5 g/l) does not noticeably affect the distribution of the actinides in the neutralized solutions.