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Hudry, D., Bardez, I., Rakhmatullin, A., Bessada, C., Bart, F., Jobic, S. & Deniard, P. (2008) Synthesis of rare earth phosphates in molten LiCl-KCl eutectic: Application to preliminary treatment of chlorinated waste streams containing fission products. J. Nucl. Mater. 381 284–289. 
Added by: Laurent Cournède (2016-03-10 21:58:40)
Type de référence: Article
DOI: 10.1016/j.jnucmat.2008.09.005
Numéro d'identification (ISBN etc.): 0022-3115
Clé BibTeX: Hudry2008
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Catégories: MIOPS
Mots-clés: ammonium dihydrogen phosphate, chloride, immobilization, monazite, nuclear, oxidation, plutonium metal, precipitation, radioactive-wastes, salt
Créateurs: Bardez, Bart, Bessada, Deniard, Hudry, Jobic, Rakhmatullin
Collection: J. Nucl. Mater.
Consultations : 6/732
Indice de consultation : 3%
Indice de popularité : 0.75%
Résumé     
The precipitation of rare earth phosphates (RE = La, Ce, Pr, Nd, and Lu), from RECl(3) Was investigated in molten LiCl-KCl eutectic at 500 degrees C in air. Ammonium dihydrogenphosphate (NH(4)H(2)PO(4)) Was used as the phosphorus precursor. X-ray diffraction analysis indicated the formation of compounds with monazite (La, Ce, Pr, and Nd) or xenotime (Lu) structures. (31)P NMR spectroscopy measurements confirmed that lanthanum formed pure monazite, which indicates a LaCl(3) -{>} LaPO(4) conversion factor near 100\%. These results demonstrate that the stoichiometric addition of NH(4)H(2)PO(4) is sufficient to obtain quantitative precipitation at 500 degrees C of anhydrous rare earth phosphates in molten LiCl-KCl. The use of this type of precursor, which has the advantage of not modifying the chemical composition of the medium after recovery of the rare earth phosphates. could be considered during the first step of purification of chlorinated baths containing fission products arising from spent fuel reprocessing by a pyrochemical process. (C) 2008 Elsevier B.V. All rights reserved.
Added by: Laurent Cournède  
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