NGUYỄN TRỌNG HÙNG, LÊ BÁ THUẬN, ĐỖ VĂN KHOÁI, CAO DUY MINH
Viện Công nghệ Xạ Hiếm
Abstract: The preliminary studies on the precipitation of ammonium uranyl carbonate (AUC) from the UO2F2 – HF solution system by precipitation agent (NH4)2CO3 and on the prepare-ability of UO2 ceramic powder via AUC route were showed in the report. The study results indicated that formation of ammonium uranyl fluoride (AUF) accompanies with AUC precipitation. In order to prevent the formation of the unwanted AUF precipitate, the AUC precipitation process was carried out in the stable pH media of 9, uranium concentration of 100 g/L and molar ratio of C to U ≥ 7.5.
Keywords: precipitation, AUC, AUF, UO2F2, nuclear fuel