title: Gas-solid reaction kinetics of ZnFe2O4 formation from 907 to 1100 °C.
abstract: The reaction kinetics of Zn vapor with Fe3O4 (magnetite) were studied from 907 to 1100 °C using a new experimental setup that only allows contact between the reactants through a gas-solid reaction. Hematite was used to create the reaction pellets. Because of the reducing atmosphere in the setup, a magnetite layer is formed on the outside of the pellet, which in turn reacts with the Zn vapor. After reaction, Zn concentration profiles were measured in the reacted magnetite layer using field-emission gun electron probe microanalysis. The reaction was confirmed to be diffusion-controlled. The effect of both volume and grain-boundary diffusion was observed in each experiment. The temperature dependence of both the volume and grain-boundary diffusion coefficients was obtained along with the activation energies of the diffusion coefficients. This study provides crucial information for the development of technologies that are dependent on the reaction. One example is the in-process separation technology for the separation of Zn vapor from electric arc furnace off-gas.
authors.affiliation: Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44, Box 2450, 3001 Heverlee, Belgium.
authors.forename: Thomas
authors.initials: T
authors.lastname: Suetens
authors.affiliation: Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44, Box 2450, 3001 Heverlee, Belgium.
authors.forename: Muxing
authors.initials: M
authors.lastname: Guo
authors.affiliation: Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44, Box 2450, 3001 Heverlee, Belgium.
authors.forename: Karel
authors.initials: K
authors.lastname: Van Acker
authors.affiliation: Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44, Box 2450, 3001 Heverlee, Belgium.
authors.forename: Bart
authors.initials: B
authors.lastname: Blanpain