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Hydrogen reduction mechanisms of ilmenite between 823 and 1353 K

Published online by Cambridge University Press:  08 February 2011

R.A. Briggs  and
A. Sacco Jr.
R.A. Briggs
Affiliation:
Department of Chemical Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts 01609
A. Sacco Jr.
Affiliation:
Department of Chemical Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts 01609
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Abstract

In situ gravimetric measurements and microscopic examinations were used to determine the mechanisms of oxygen removal from synthetic ilmenite disks between 823 and 1353 K. Under a hydrogen atmosphere, iron was observed to form a layer of low porosity on the surface of samples early in the reduction. This created diffusion limitations for hydrogen to the reaction front and for the escape of water vapor. A shrinking core reduction model, modified to include the growth of this iron film, was capable of predicting the conversion-time relationships of ilmenite samples. An activation energy of 43.2 ± 2.6 kcal/gmole was determined to be representative of reaction control over the temperature range 823–1023 K.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 3 , March 1991 , pp. 574 - 584
Copyright
Copyright © Materials Research Society 1991

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