Dissolution of Plutonium Dioxide Using HCl-HF. PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
High-fired PuO2 (950° to 1700°C) can be dissolved in boiling 6.1 M HCl when the fluoride ion concentration to plutonium mole (F−/Pu) ratio is>0.5. The amount of PuO2 (950°C calcined oxide) dissolved in 1 hour increased from approx.0.2% to 66%, 91%, and 100% as the F−/Pu ratio increased from 0 to 0.5, 1.0, and 1.8, respectively. The PuO2 dissolution rates in HCl-CaF2 solutions decrease with increasing oxide calcination temperatures and decreasing oxide surface areas. At a F−/Pu ratio of 1.8, the 1700°C calcined oxide was completely dissolved in 2.5 hours versus 1 hour for the 950°C calcined oxide.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
High-fired PuO2 (950° to 1700°C) can be dissolved in boiling 6.1 M HCl when the fluoride ion concentration to plutonium mole (F−/Pu) ratio is>0.5. The amount of PuO2 (950°C calcined oxide) dissolved in 1 hour increased from approx.0.2% to 66%, 91%, and 100% as the F−/Pu ratio increased from 0 to 0.5, 1.0, and 1.8, respectively. The PuO2 dissolution rates in HCl-CaF2 solutions decrease with increasing oxide calcination temperatures and decreasing oxide surface areas. At a F−/Pu ratio of 1.8, the 1700°C calcined oxide was completely dissolved in 2.5 hours versus 1 hour for the 950°C calcined oxide.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The dissolution of plutonium dioxide in nitirc acid (HNO3) at high hydrofluoric acid (HF) concentrations has been investigated. Dissolution rate curves were obtained using 12M HNO3 and HF at concentrations varying from 0.05 to 1.0 molar. The dissolution rate increased with HF concentration up to 0.2M and then decreased at higher concentrations. There was very little plutonium dissolved at 0.7 and 1.0M HF because of the formation of insoluble PuF4. Various oxidizing agents were added to 12M HNO3-1M HF dissolvent to oxidize Pu(IV) to Pu(VI) and prevent the formation of PuF4. Ceric (Ce(IV)) and silver (Ag(II)) ions were the most effective in dissolving PuO2. Although these two oxidants greatly increased the dissolution rate, the rates were not as rapid as those obtained with 12M HNO3-0.2M HF.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Effective dissolution of plutonium dioxide has traditionally been accomplished by contact with strong nitric acid containing a small amount of fluoride at temperatures of [approximately] 100 C. In spite of these aggressive conditions, PuO[sub 2] dissolution is sometimes incomplete requiring additional contact with the solvent. This work focused on an alternative to conventional dissolution in nitric acid where an electron transfer catalyst, Fe(II), was used in hydrochloric acid. Cyclic voltammetry was employed as an in-situ analytical technique for monitoring the dissolution reaction rate. The plutonium oxide selected for this study was decomposed plutonium oxalate with> 95% of the material having a particle diameter (
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Author: Armen R. Kazanjian
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Author: D. Crossley
Author: W. S. Gilman
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Author: Keith William Fife
Author: F. E. Butler