Hydrogen reduction mechanisms of ilmenite between 823 and 1353 K
- 1 March 1991
- journal article
- research article
- Published by Springer Nature in Journal of Materials Research
- Vol. 6 (3) , 574-584
- https://doi.org/10.1557/jmr.1991.0574
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.This publication has 12 references indexed in Scilit:
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