Preparation of Acid Deficient Solutions of Uranyl Nitrate and Thorium Nitrate by Steam Denitration
Acid deficient heavy metal (HM) nitrate solutions are often required in the internal gelation processes for nuclear fuel fabrication. The stoichiometric HM-nitrate solutions are needed in a sol-gel process for fuel fabrication. A method for preparing such nitrate solutions with a controlled molar ratio of nitrate/metal by denitration of acid-excess nitrate solutions was developed. The denitration was conducted by bubbling a nitrate solution with a mixture of steam+Ar. It was found that steam was more effective for the denitration than Ar. The acid deficient uranyl nitrate solution with nitrate/U=1.55 was yielded by steam bubbling, while not by only Ar bubbling. As for thorium nitrate, acid deficient solutions of nitrate/Th ?? 3.1 were obtained by steam bubbling.
- Journal of nuclear science and technology
Journal of nuclear science and technology 33(2), p.147-151, 1996-02-25
Atomic Energy Society of Japan