Hydrogen reduction mechanisms of ilmenite between 823 and 1353 K

R. A. Briggs, A. Sacco

Research output: Contribution to journalArticle

28 Scopus citations

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.

Original languageEnglish
Pages (from-to)574-584
Number of pages11
JournalJournal of Materials Research
Volume6
Issue number3
DOIs
StatePublished - Mar 1991

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