Author: G.F. MolenPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Dissolution of Plutonium Oxide
Dissolution of Plutonium Oxide in Nitric Acid at High Hydrofluoric Acid Concentrations
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.
Dissolution of Plutonium Oxide in Nitric Acid at High Hydrofluoric Acid Concentrations
Author: Armen R. KazanjianRecovery of Plutonium from Incinerator Ash
Author: F. E. ButlerDissolution of High-fired Plutonium Oxide
Author: Plutonium Oxide Dissolution
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 5
Book Description
Several processing options for dissolving plutonium oxide (PuO[sub 2]) from high-fired materials have been studied. The scoping studies performed on these options were focused on PuO[sub 2] typically generated by burning plutonium metal and PuO[sub 2] produced during incineration of alpha contaminated waste. At least two processing options remain applicable for dissolving high-fired PuO[sub 2] in canyon dissolvers. The options involve solid solution formation of PuO[sub 2] With uranium oxide (UO[sub 2]) and alloying incinerator ash with aluminum. An oxidative dissolution process involving nitric acid solutions containing a strong oxidizing agent, such as cerium (IV), was neither proven nor rejected. This uncertainty was due to difficulty in regenerating cerium (IV) ions during dissolution. However, recent work on silver-catalyzed dissolution of PuO[sub 2] with persulfate has demonstrated that persulfate ions regenerate silver (II). Use of persulfate to regenerate cerium (IV) or bismuth (V) ions during dissolution of PuO[sub 2] materials may warrant further study.
DISSOLUTION OF PLUTONIUM OXIDE.
Author: Catalyzed Electrolytic Plutonium Oxide Dissolution (CEPOD)
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 37
Book Description
Catalyzed Electrolytic Plutonium Oxide Dissolution (CEPOD) was first demonstrated at PNL in early 1974 in work funded by EXXON Corporation. That work was aimed at dissolution of Pu-containing residues remaining in mixed-oxide reactor fuels dissolution and was first publicly disclosed in 1981. The process dissolves PuO2 in an anolyte containing small (catalytic) amounts of elements that form kinetically fast, strongly oxidizing ions. These are continuously regenerated at the anode. Catalysts used, in their oxidized form, include Ag{sup 2+}, Ce{sup 4+}, Co{sup 3+}, and AmO2{sup 2+}. This paper reviews the chemistry involved in CEPOD and the results of its application to the dissolution of the Pu content of a variety of PuO2-containing materials such as off-standard oxide, fuels dissolution residues, incinerator ash, contaminated soils, and other scrapes or wastes. Results are presented for both laboratory-scale and plant-scale dissolvers. Spin-off applications such as decontamination of metallic surfaces and destruction of organics are discussed. 27 refs., 14 figs.
In Vitro Dissolution of Respirable Aerosols of Industrial Uranium and Plutonium Mixed-oxide Nuclear Fuels
Author: A. F. EidsonPublisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 32
Book Description
A Review of the Dissolution of Plutonium Dioxide
Author: W. S. GilmanPublisher:
ISBN:
Category : Bibliography
Languages : en
Pages : 14
Book Description