三氧化铀粉末溶解工艺研究

Study on the Dissolution Process of the Uranium Trioxide Powder

三氧化铀是乏燃料后处理厂的一种产品,可用于制备工厂开车、铀尾端调试、制备四价铀等工艺环节所需的硝酸铀酰溶液。为明确三氧化铀粉末溶解制备硝酸铀酰溶液的最优工艺条件,有针对性地提高三氧化铀溶解工艺水平,探索其溶解特性,有必要研究三氧化铀溶解过程中工艺条件对溶解过程的影响。本文研究了不同搅拌速度、温度、初始酸度条件下,硝酸溶解三氧化铀粉末的过程,分析了反应条件对溶解过程的影响方式,并得到了最优工艺条件。结果表明:提高反应温度、初始酸度均有利于三氧化铀的溶解,随着搅拌速度的提高溶解时间呈现先减小后增大的趋势。

Uranium trioxide is the product of spent fuel reprocessing plants,which can be used to prepare uranyl nitrate solutions required for plant start-up,uranium tail-end commissioning,and preparation of U(Ⅳ).In order to clarify the optimal process conditions for the preparation of uranyl nitrate solution by dissolving uranium trioxide powder,to improve the level of uranium trioxide dissolution process in a targeted manner,and to explore its dissolution characteristics,it is necessary to study the effect of process conditions on the dissolution process of uranium trioxide.In this paper,the process of dissolving uranium trioxide powder by nitric acid under different stirring speed,temperature and initial acidity conditions were studied,the influence of reaction conditions on the dissolution process was analyzed,and the optimal process conditions were gotten.The results show that increasing the reaction temperature and initial acidity is beneficial to the dissolution of uranium trioxide.With the increase of the stirring speed,the dissolution time first decreases and then increases.