反萃取液浓缩结晶技术制备AUC

Research of the Counter-extract Concentration Crystallization Technology

针对传统方法制备三碳酸铀酰铵(AUC)工艺流程长、试剂消耗大等问题,对反萃取液浓缩结晶技术在制备AUC中的应用进行了研究,探索了物料加料顺序、碳铀物质的量之比、老化时间、加料速度等对AUC结晶的影响。试验结果表明:当参与反应物料n(CO^(2-)_(3))/n(UO^(2+)_(2))>3.5∶1、反应温度控制在50℃、老化时间30~60 min、加料速度60 mL/min时,可使结晶母液中的铀质量浓度小于5 g/L。通过该工艺技术生产核纯二氧化铀可简化流程,减少废水的排放及原材料试剂的消耗。

In view of the problems on the traditional(NH 4)4[UO_(2)(CO_(3))3]long technical process and large consumption of the reagent,the experiment has studied the counter-extract concentration crystallization technology and explored the influences on crystallized AUC such as the material feeding order,n(CO^(2-)_(3)/n(UO_(2)+2),the aging time,added the speed and so on,the results show that when n(CO^(2-)_(3))/n(UO_(2)+2)>3.5∶1 might in the crystallized mother liquor uranium metal density be smaller than 5 g/L,the production of(NH 4)4[UO_(2)(CO_(3))3]crystallization appearance will surpass the production craft.May reduce the wasted water and the consumption of the raw material reagent through this processing technology to produce UO_(2).