压缩空气搅拌在ADUN溶液制备中的应用

Application of Compressed Air Agitation in Preparation of ADUN Solution

采用缺酸溶解法研究了压缩空气搅拌在批量化生产缺酸硝酸铀酰(ADUN)溶液中的应用。结果表明:压缩空气搅拌适合ADUN溶液批量化制备,在压缩空气压力为0.3 MPa、流量为200~300 L/h时,铀溶解率达99%;压缩空气搅拌提供了充足的氧气,抑制了亚硝酸根的生成,制备的ADUN溶液中NO2-质量浓度小于1g/L,在后续使用时可省去煮胶步骤;采用压缩空气搅拌方式完成了394批次AUDN溶液制备验证,制备的ADUN溶液铀质量浓度介于556~623 g/L,NO3-与U的摩尔比[NO3-]/[U]介于1.56~1.75,均满足溶胶凝胶法制备UO2微球的要求。

The application of compressed air agitation in the mass production of acid-depleted of uranyl nitrate(ADUN)solution was studied using the acid-deficient dissolution method.The results show that the compressed air-agitation is suitable for the mass preparation of ADUN solution.The uranium dissolution rate is up to 99%at air compressed of 0.3 MPa,and the air flow rate of 200-300 L/h.The compressed air provides sufficient oxygen to inhibit the formation of nitrite.The NO2-concentration in the prepared ADUN solution is less than 1 g/L,and the cooking step can be omitted in subsequent use.394 batches of acid-depleted solution of uranyl nitrate have been prepared by using compressed air agitation.The results showed that uranium concentration was between 556-623 g/L and the[NO3-]/[U]molar ratio between 1.56-1.75,both meeting the requirements of the preparation of UO2 micro spheres by sol-gel method.