2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 6: Rare Earths & Ionic Liquids

Editors:	Kongoli F
Publisher:	Flogen Star OUTREACH
Publication Year:	2014
Pages:	432 pages
ISBN:	978-1-987820-08-9
ISSN:	2291-1227 (Metals and Materials Processing in a Clean Environment Series)

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THE MBr-EuBr2 MOLTEN SALT MIXTURES: FROM EXPERIMENTS TO ASSESSMENT (M=ALKALI METAL)

Marcelle Gaune-Escard¹; Slobodan Gadzuric²; Weiping Gong³; Leszek Rycerz⁴;
¹POLYTECH, Marseille, France; ²FACULTY OF SCIENCES, Novi Sad, Serbia and Montenegro (formerly Yugoslavia); ³HUIZHOU UNIVERSITY, Huizhou, China; ⁴CHEMICAL METALLURGY GROUP, WROCLAW UNIVERSITY OF TECHNOLOGY, Wroclaw, Poland;
Type of Paper: Regular
Id Paper: 162
Topic: 11

Abstract:

Lanthanides are fairly used in a number of applications, such as lanthanide or lanthanide alloys production, recycling of spent nuclear fuel, waste processing, lighting industry, etc. Many industrial processes, that are molten salt-based, involve rare earth halides and their mixtures with alkali halides. The present work focuses on the thermodynamic properties of europium (II) bromide-alkali bromide melts. By opposition to most lanthanide compounds, which correspond to the valence state (III), europium is one of the few rare earth metals together with samarium and ytterbium that forms stable compounds in the valence state (II).
Several experimental techniques were used complementarily to acquire the corresponding physicochemical data that are also required for process development. Also, numerical approaches were applied to the above systems.
A critical thermodynamic description on MBr-EuBr2 systems was carried out by the CALPHAD method. A two-sublattice ionic solution model for the liquid, denoted as (M+)P :(Br-, EuBr42-, EuBr2)Q, was employed to represent phase diagram and enthalpy of mixing data. To reach a self-consistent thermodynamic description for the constituent phases in the system, the experimental heat capacity data of the intermediate compounds M2EuBr4 and MEu2Br5 were evaluated.

Keywords:

molten salts, EuBr2, alkali bromides, phase diagram, heat capacity, enthalpy of mixing, electrical conductivity, thermodynamic assessment.


Cite this article as:

Gaune-Escard M, Gadzuric S, Gong W, Rycerz L. THE MBr-EuBr2 MOLTEN SALT MIXTURES: FROM EXPERIMENTS TO ASSESSMENT (M=ALKALI METAL). In: Kongoli F, editors. Sustainable Industrial Processing Summit SIPS 2014 Volume 6: Rare Earths & Ionic Liquids. Volume 6. Montreal(Canada): FLOGEN Star Outreach. 2014. p. 355-356.