A Precipitation of Ammonium Uranyl Carbonate from Uranylnitrate Solution

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J. Korean Ceram. Soc. > Volume 35(6); 1998 > Article

Journal of the Korean Ceramic Society 1998;35(6): 559.

UO$_2$(NO$_3$)$_2$ 용액으로부터 Ammonium Uranyl Carbonate 제조

김응호, 김형수¹, 이규암¹, 유재형, 최청송²

한국원자력연구소
¹한국원자력연료 주식회사
²서강대학교 화학공학과

A Precipitation of Ammonium Uranyl Carbonate from Uranylnitrate Solution

ABSTRACT

Studies of preparation condition and characteristics of AUC(ammonium uranyl carbonate) were carried out to optimize AUC process with different reactor sizes and precipitation methos. As results four types of precipitates with different chemical compositions and morphologies were obtained from the reaction of {{{{ {(NH }_{4 }) { }_{2 } {CO }_{3 } }} with {{{{ {UO }_{2 }( {NO }_{3 }) { }_{2 } }} solution. A phase diagram has been made and crystal structure and chemical composition of each phase have been characterized by using SEM X-ray IR and thermal analysis. It was found that ammonium uranyl carbonate {{{{ {(NH }_{4 }) { }_{4 } {UO }_{2 } {(CO }_{3 }) { }_{3 } }} with monoclinic crystal morphology could be syn-thesized when the mole ratio of in {{{{ {(NH }_{4 }) { }_{2 } {CO }_{3 }/ {UO }_{2 } {(NO }_{3 }) { }_{2 } }} in the solution was higher than 5 Also a mechanism and a precipitating condition on rounding of the AUC particle were examined in the course of the AUC pre-cipitation. The rounding of the AUC particle was possible only by external circulation using pump not by internal circulation using agitator.

Key words: Precipitation, Ammonium uranyl carbonate, UO$_2$(NO$_3$)$_2$, Ammonium carbonate