The Impact of Iron Oxide Concentration on the Performance of Molten Oxide Electrolytes for the Production of Liquid Iron Metal

The effect of iron oxide concentration on the conductive behavior of a molten oxide electrolyte has been investigated at 1823 K using stepped linear scan voltammetry. To maximize the current flow through the electrolyte the ohmic drop in the cell was minimized by shortening the electrode distance. T...

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Bibliographic Details
Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2020-02, Vol.51 (1), p.365-376
Main Authors: Wiencke, Jan, Lavelaine, Hervé, Panteix, Pierre-Jean, Petitjean, Carine, Rapin, Christophe
Format: Article
Language:English
Subjects:
Aluminum oxide
Characterization and Evaluation of Materials
Charge transfer
Chemical Sciences
Chemistry and Materials Science
Electrolytes
Form factors
Iron and steel making
Iron oxides
Mass transfer
Materials Science
Metallic Materials
Nanotechnology
Ohmic drop
Reaction kinetics
Structural Materials
Surfaces and Interfaces
Thin Films
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Summary:The effect of iron oxide concentration on the conductive behavior of a molten oxide electrolyte has been investigated at 1823 K using stepped linear scan voltammetry. To maximize the current flow through the electrolyte the ohmic drop in the cell was minimized by shortening the electrode distance. The acquired current was then interpreted by means of an ohmic drop correction, taking into account the conductivity of the alumina-silicate electrolyte and the geometrical form factor of the cell. Via this methodology, a mass transfer limitation in dependence of the iron oxide concentration was identified. This mass transfer limitation vanishes above 7 wt pct of iron oxide where charge transfer starts to be limited solely by electrochemical reaction kinetics. In the analyzed range of concentration, an impact of iron oxide on electronic conduction was not measurable. In addition to these findings, the faradaic yield of the anode half-reaction was determined by the life-measure of O 2 -production. Hereby, a domain of an anodic yield close to 100 pct for various iron oxide concentrations was identified. Based on these findings, suitable conditions for the electrochemical production of liquid iron were determined.
ISSN:1073-5615
1543-1916
DOI:10.1007/s11663-019-01737-3