Issue 22, 2015

Reduction kinetics of hematite to magnetite under hydrothermal treatments

Abstract

The phase transformation of α-Fe2O3 to Fe3O4 was observed by the hydrothermal treatment of a ferric solution at 160–220 °C with the addition of both KOH and EDA into the reaction system. The reactions began with the formation of α-Fe2O3 hexagonal plates followed by the phase transformation involving the dissolution of the α-Fe2O3 hexagonal platelets, the reduction of Fe3+ to Fe2+, and the nucleation and growth of new Fe3O4 polyhedral particles. The activation energies for the phase transformation of α-Fe2O3 to Fe3O4 under hydrothermal conditions are estimated to be 96.4 ± 11, 113.1 ± 5, and 118.3 ± 11 kJ mol−1 for the addition of 0.5, 1 and 1.5 ml of EDA, respectively, which are about the same for the typical phase transformation of α-Fe2O3 to Fe3O4 in a hydrogen atmosphere.

Graphical abstract: Reduction kinetics of hematite to magnetite under hydrothermal treatments

Article information

Article type
Paper
Submitted
15 Oct 2014
Accepted
23 Jan 2015
First published
23 Jan 2015

RSC Adv., 2015,5, 17236-17244

Reduction kinetics of hematite to magnetite under hydrothermal treatments

J. F. Lu and C. J. Tsai, RSC Adv., 2015, 5, 17236 DOI: 10.1039/C4RA12389A

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