Conversion of actinide nitrate surrogates into oxide using combustion synthesis process: A facile approach

JOURNAL OF NUCLEAR MATERIALS

卷:525

Article

Monnier, J.¹  Rey, C.¹  Mohan, S. Chandra¹  Causse, J.¹  Welcomme, E.²  Deschanels, X.¹ 

[1] Univ Montpellier, ICSM, CEA, ENSCM,CNRS, Marcoule, France

[2] CEA Marcoule, CEA, Lab Etud Proc Convers Actinides LPCA, Nucl Energy Div,Res Dept Min & Fuel Recycling Pro, F-30207 Bagnols Sur Ceze, France

关键词: Actinide conversion;    Gadolinium nitrate;    Glycine;    Combustion synthesis;   

DOI  :  10.1016/j.jnucmat.2019.07.021

来源: Elsevier

【 摘 要 】

In recent years, the focus of research in the conversion routes for the actinide nitrates into oxides for the generation IV nuclear fuel cycle have attracted rapidly growing interest. One process is the self-sustained exothermic reaction of Solution Combustion Synthesis (SCS) methodology. It was applied here to the reaction of an actinide surrogate Gd(NO3)(3),6H(2)O with glycine in air to produce similar to 10(-3) mol amounts of Gd2O3. The primary process parameters were the Gd/glycine ratio and heating rate, which affected the ignition temperature of the precursor mixture. An optimum ratio of one and a heating rate of 10 K min(-1) resulted in nearly complete SCS conversion over the 483-573 K temperature range and ultrafine gadolinia powders. The 100- to 500-fold swelling of the reactant mixture plays a dynamic role in the reactivity of the system. Final products were characterized by X-Rays Diffraction (XRD), surface area analysis, carbon content, and Scanning Electron Microscopy (SEM). The structural characteristics of the final gadolinia phases have been interpreted by the adiabatic flame temperature calculation. (C) 2019 Elsevier B.V. All rights reserved.

【 授权许可】

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