Electronically driven transport of oxygen from liquid iron to CO + CO2 gas mixtures through stabilized zirconia |
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| Authors: | M Iwase M Tanida A Mclean T Mori |
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| Affiliation: | (1) Department of Metallurgy and Materials Science, University of Toronto, Toronto, Canada;(2) Hirohata Steel Plant, Nippon Steel Corp., Japan;(3) Kyoto University, Kyoto, Japan |
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| Abstract: | Transport of oxygen in the following electrochemical system was investigated;O (liquid iron) Oin2− (in ZrO22−CaO) O2 (CO + CO2)
An alumina crucible was charged with liquid iron containing 580 ± 10 ppm oxygen. A calcia-stabilized zirconia tube (closed
at one end) was immersed in the liquid iron. The inside of the zirconia tube was flushed with a stream of CO + CO2 gas mixture.
Oxygen was removed from liquid iron to the CO + COO2 gas mixture without application of an external current. Kinetics of oxygen transport in this system are discussed in terms
of mixed ionic and electronic conduction of the zirconia, and also diffusion of oxygen in liquid iron. The rate controlling
step for this oxygen removal process was found to be transport of oxygen across a boundary layer in the melt at the melt/electrolyte
interface.
M. IWASE, on leave from the Department of Metallurgy, Kyoto University, Kyoto, Japan
M. TANIDA, Formerly Graduate Student at Kyoto University |
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