Formation of lanthanide phosphates in molten salts and evaluation for nuclear waste treatment / Volkovich VA,Griffiths TR,Thied RC // PHYSICAL CHEMISTRY CHEMICAL PHYSICS. - 2003. - V. 5, l. 14. - P. 3053-3060.

ISSN/EISSN:

1463-9076 / нет данных

Type:

Article

Abstract:

The formation of phosphates of the lighter lanthanides (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb and Dy) by reaction with alkali metal phosphates has been studied in a LiCl-KCl eutectic melt between 450 and 650degreesC and in a NaCl-KCl equimolar melt at 750degreesC and under an inert atmosphere. Alkali metal ortho-, meta- and pyrophosphate precursors have been employed. The reaction results in the formation of single lanthanide or double alkali metal-lanthanide orthophosphates, the former favoured in LiCl-KCl melts and the latter in NaCl-KCl melts. The mean crystallite size of precipitated phosphates was evaluated from X-ray powder diffraction patterns, and found to be within 300-450 Angstrom. Increasing the melt temperature results in increasing the crystallite size of phosphate phases. This technique offers an attractive means of removing lanthanide fission products from chloride melts arising from pyrochemical reprocessing of spent nuclear fuels. LiCl-KCl based melts are recommended because the bulk of phosphate waste precipitated is smaller since normal rather than double phosphates are formed therein.

Author keywords:

RARE-EARTH ELEMENTS; MECHANOCHEMICAL CHANGES; THERMAL-REACTIONS; ALKALI-METALS; CELL VOLUMES; ORTHOPHOSPHATES; MONAZITE; IONS; LU; EU

DOI:

10.1039/b302280n

Web of Science ID:

ISI:000183914900021

Соавторы в МНС:

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Другие поля

Поле	Значение
Publisher	ROYAL SOC CHEMISTRY
Address	THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Language	English
Keywords-Plus	RARE-EARTH ELEMENTS; MECHANOCHEMICAL CHANGES; THERMAL-REACTIONS; ALKALI-METALS; CELL VOLUMES; ORTHOPHOSPHATES; MONAZITE; IONS; LU; EU
Research-Areas	Chemistry; Physics
Web-of-Science-Categories	Chemistry, Physical; Physics, Atomic, Molecular \& Chemical
ResearcherID-Numbers	Volkovich, Vladimir/K-8339-2012
ORCID-Numbers	Volkovich, Vladimir/0000-0003-4438-1194
Number-of-Cited-References	49
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	12
Journal-ISO	Phys. Chem. Chem. Phys.
Doc-Delivery-Number	696YJ