Development of an Electro-Oxidative Dissolution Technique for Fast Reactor Carbide Fuels

Palamalai, A.; Rajan, Sriram; Chinnusamy, A.; Sampath, M.; Varghese, Paulson; Ravi, T.; Raman, V.; Balasubramanian, Ganapathi

doi:10.1524/ract.1991.55.1.29

Cited by 22 publications

(14 citation statements)

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“…However, uranium oxidation was accompanied by the accumulation of undefined organic species in the electrolyte [3,4]. Photochemical [5] and electrochemical [6] techniques were applied to oxidize the organic species to CO 2 and to accelerate UC dissolution. It is difficult to interpret the UC dissolution mechanism, however, due to the absence of fundamental data on UC electrochemical properties.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical behavior of UC in acidic media: Preliminary results

Maslennikov

Fourest

Sladkov

et al. 2007

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Electrochemical behavior of UC in acidic media: Preliminary results

Maslennikov

Fourest

Sladkov

et al. 2007

Journal of Alloys and Compounds

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“…Thus, a wet recycling approach has to be adapted, where dissolution is a prerequisite. A rapid and quantitative dissolution method based upon microwave heating with reduced amounts of fluoride/ reagents or catalysed electro oxidative/reductive dissolution [40,41] could form a future work area. Therefore, each scrap needs a head-end treatment to reduce non-metallic impurities prior to purification of metallic impurities.…”

Section: Recycling Methodologiesmentioning

confidence: 99%

“…The scrap from furnaces (scrap-D) and the centreless grinding (scrap-F) operations comparatively leaves smaller quantity of the residue (nearly 1 %). Thus, the impure scrap, if to be recycled by following a wet chemical process needing dissolution; has to be dissolved either dissolution aids like fluoride or electrochemical processes [40,41]. For recycling of impure scrap, however the use of fluoride leads to corrosion of the equipments.…”

Section: Dissolution Characteristics Of Impure Mox Scrapmentioning

confidence: 99%

Impurity analysis and dissolution behaviour of plutonium bearing impure MOX scrap: an assessment of recycling feasibility

Singh

Kumar

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et al. 2016

J Radioanal Nucl Chem

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A significant quantity of plutonium bearing scrap was getting generated during the fabrication of (U,Pu)O 2 mixed oxide fuel for Indian Prototype Fast Breeder Reactor. This document assesses the feasibility of carrying out recycling of the impure scrap to permit the efficient plutonium recovery and re-use. The impure scrap which constitutes nearly 5 % of the total throughput was examined for impurities present and dissolution behaviour in HNO 3 . On the basis of experimental results obtained recycling methodologies are recommended. This study reveals that not all types of the impure scrap need aqueous recycling methods; some can be dry recycled.

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“…This result is in good agreement with the reaction order n = 1.0, obtained using Eq. (12) for the fitting of the results of UC dissolution in HClO 4 -HNO 2 system.…”

Section: Uc Dissolution Kinetic Modelmentioning

confidence: 99%

“…The organic compounds may exhibit an adverse effect on the uranium separation by liquid-liquid extraction because they can form stable complexes with U(VI) and they may participate in the possible formation of a so-called "third phase" during the extraction process [5,6]. The UC dissolution in presence of oxidizing agents such as MnO 4 − , Ce 4+ , BiO 3 − [6,9] or electrochemically generated Ag(II) [11,12] significantly, but not completely, reduces the organic matter in the UC dissolver solution.…”

Section: Introductionmentioning

confidence: 99%

UC oxidation with HNO2 in aqueous solutions of HNO3 and HClO4

Maslennikov¹,

Genin²,

Vermeleun³

et al. 2009

Radiochimica Acta

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The oxidation of UC powder was studied in 0.5-6.0 M HNO 3 and HClO 4 , containing 0.01-0.1 M NaNO 2 , at ambient temperature. The addition of nitrous acid caused the oxidation potential to exceed 400 mV/SCE and thus accelerated the dissolution and increased the dissolution yield to exceed 95%. One hundred percent dissolution at room temperature was achieved within 30 to 40 min when 3.0-6.0 M HNO 3 was used that contained more than 0.005 M HNO 2 .The dissolution rate increased with increasing HNO 3 concentration and initial solid-to-liquid ratio. The effective dissolution rate constants and reaction orders were estimated for the UC oxidation with H + , NO 3 − and HNO 2 in 0.5-6.0 M HClO 4 . The rate of UC oxidation with HNO 2 exceeded 50-80 times its oxidation rates with NO 3 − ions. During UC oxidation with HNO 2 in 0.5-6.0 M HClO 4 , 60-85% carbon was oxidized to CO 2 . The C/U(VI) ratio in the dissolver solution decreased from 0.5 to 0.1 mg eq/mol with increasing of HClO 4 and HNO 2 solution concentration. Two to five percent of the carbon remained in the insoluble residue of the HNO 3 dissolver solutions, even when a 100% U(VI) yield was observed. Scanning electron microscopy of the insoluble residue showed the carbon particle size between 1.0 and 5.0 µm.

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Development of an Electro-Oxidative Dissolution Technique for Fast Reactor Carbide Fuels

Cited by 22 publications

References 0 publications

Electrochemical behavior of UC in acidic media: Preliminary results

Electrochemical behavior of UC in acidic media: Preliminary results

Impurity analysis and dissolution behaviour of plutonium bearing impure MOX scrap: an assessment of recycling feasibility

UC oxidation with HNO2 in aqueous solutions of HNO3 and HClO4

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