Reductive dissolution studies of CeO2 and simulated mixed oxide fuel of (Ce, U)O2 in nitric acid medium
| Autor: | Anitha Pius, T. Aneesh, K. Dhamodharan |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Cerium oxide
Health Toxicology and Mutagenesis Public Health Environmental and Occupational Health Oxide chemistry.chemical_element 010403 inorganic & nuclear chemistry 01 natural sciences Pollution Arrhenius plot 0104 chemical sciences Analytical Chemistry chemistry.chemical_compound Cerium Nuclear Energy and Engineering chemistry Nitric acid Mixed oxide Radiology Nuclear Medicine and imaging Dissolution Spectroscopy Nuclear chemistry Uranous |
| Zdroj: | Journal of Radioanalytical and Nuclear Chemistry. 319:1127-1133 |
| ISSN: | 1588-2780 0236-5731 |
| Popis: | In dissolution studies involving plutonium oxide, oxides of cerium are employed as a non radioactive surrogate. A reductive dissolution of cerium oxide and mixed oxide consisting cerium-uranium were investigated in nitric acid medium in presence of uranous. Extensive dissolution studies were carried out using ceria powder in pure HNO3 and HNO3–[N2H5]+ [NO3]− with U(IV). The effects of temperature, mixing rate and concentration of reducing agent on dissolution efficiency of CeO2 were investigated. The apparent activation energy was calculated from Arrhenius plot for dissolution of cerium oxide in HNO3 in presence of uranous stabilized by hydrazine and it was found to be about 40 kJ mol−1 in the temperature range of 300–350 K. The fraction of total mass of uranium and cerium from the mixed oxide pellet leached as function of time was monitored during dissolution performed under optimized conditions and dissolution yield was found to be > 99%. |
| Databáze: | OpenAIRE |
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