天然二氧化铀产品质量薄弱环节分析

Weak Points Analysis of Natural Uranium Dioxide Product Quality

在二氧化铀生产中,煅烧工序是影响二氧化铀产品(四价铀)指标的关键环节。基于三碳酸铀酰铵分解还原生成二氧化铀的机理,分析了影响四价铀产品质量的主要因素与控制手段,发现由于二氧化铀被氧化导致四价铀不合格是无法被直观测量的,但又是最主要的影响因素。从物料异常、设备故障、异常操作等方面总结了四价铀不合格的原因,其中设备故障与异常操作极易引起二氧化铀被氧化,从而导致四价铀不合格。因此,天然二氧化铀生产的质量薄弱环节主要在于三碳酸铀酰铵的煅烧设备故障与冷却过程的异常操作。

The calcination process in uranium dioxide production is a crucial link that affects the indicators(tetravalent uranium)of uranium dioxide products.The mechanism of decomposition and reduction of AUC to produce UO 2 is discussed,and the main factors and control measures affecting the tetravalent uranium content in the product are identified.It is found that the oxidation of UO 2 leading to unacceptable tetravalent uranium levels cannot be directly measured but is a significant factor.Common reasons for tetravalent uranium levels being unacceptable,such as material abnormalities,equipment failures,and abnormal operations,are summarized.Equipment failures and abnormal operations are particularly prone to causing the oxidation of UO 2 leading to unacceptable tetravalent uranium levels.Therefore,the weak points in the quality of natural uranium dioxide product mainly lie in equipment failures during the calcination of AUC and abnormal operations in the cooling process.