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Comparative study on the chemical stability of Fe 3 O 4 and NiFe 2 O 4 in molten salts

Meyer, Pauline and Gibilaro, Mathieu and Massot, Laurent and Pasquet, Isabelle and Tailhades, Philippe and Bouvet, Sylvie and Chamelot, Pierre Comparative study on the chemical stability of Fe 3 O 4 and NiFe 2 O 4 in molten salts. (2018) Masterials Science and Engineering : B, 228. 117-122. ISSN 0921-5107

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Official URL: http://dx.doi.org/10.1016/j.mseb.2017.11.025

Abstract

Tests on NixFe3−xO4 spinels, considered as promising materials in the aluminium production, were performed on Fe3O4 and NiFe2O4. First, FeAl2O4 aluminate was spontaneously formed by Fe3O4 immersion at 960 °C, due to Fe3+/Al3+ substitution into the spinel structure. Then, stability of aluminate compound was investigated into cryolite melt and results showed a rapid dissolution when the aluminate composition tends to FeAl2O4. Kinetic studies demonstrated that the spinel dissolution was around twentyfold higher than aluminate formation, confirming the micrographic observation. To prevent it, nickel was added in the spinel structure up to NiFe2O4 and no dissolution was observed.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at : https://www.sciencedirect.com/science/article/pii/S0921510717303112
HAL Id:hal-01739693
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Rio Tinto Alcan (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:21 Mar 2018 10:49

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