规模化制备重铀酸铵微球的设备及工艺研究

Equipment and Technology Research for Large Scale Preparation of Ammonium Diuranate Microspheres

本文介绍了由清华大学核研院建立的规模为每批次3 kg U,用于制备重铀酸铵凝胶微球的外胶凝工艺生产线,重点介绍了具有创新性的溶解、煮胶、分散一体化设备、陈化洗涤干燥一体化设备及振动分选机。并以规模化的关键设备为基础,重点解决了如何实现欠酸溶解、煮胶沉淀问题、滴球过程中的喷嘴内径变化及陈化洗涤干燥过程对成球的影响等问题。最终采用新研制的规模化的设备及工艺成功地生产出了直径合格的重铀酸铵凝胶微球,为后续工艺及最终得到合格的UO_2核芯微球做好了准备。

In this paper, external gelation process line established by INET （Institute of Nuclear and New Energy Technology,Tsinghua University） was introduced, which was used for the preparation of ammonium diuranate gel microspheres with 3 kg U each batch. The innovative integrated dissolving, cooking and dispersing equipment, AWD （aging, washing and drying） device and vibrating separator were introduced. And based on the key equipment, acid-deficient dissolution, precipitation problems in the boiling process, effects of nozzle diameter and AWD process on balling performance were studied. Finally, ammonium diuranate gel microspheres with qualifed diameters were successfully produced using the newly developed scale-up equipment and process, and prepared for the rest of the dry process and the resulting qualifed UO2 kernels.