TG study on the reduction kinetics of hematite and iron oxide-containing wastes

I. S. Pap, J. Szépvölgyi, I. Bertóti, G. Mink, T. Székely

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Abstract

The reduction kinetics of a pure and a Ca-added hematite, as well as of two iron oxide-containing metallurgical wastes, were studied by means of isothermal TG measurements, using H2 or CO as reducing agents. Below 900 K, the wastes were far less reactive than the pure or Ca-added hematite. This phenomenon was attributed to retardation of the hematite-magnetite transformation by surface Na and Si. Above 1000 K, however, the reaction rates for the wastes and for the Caadded hematite were higher than that of the pure hematite. The higher reactivities were attributed to the effects of the Ca on the microstructure of the product layer. The models of nucleation and growth processes were applied to describe the isothermal TG curves at low temperatures and in the vicinity of the rate minimum, while the model for gas-film diffusion control could be used in the case of high reaction rates.

Original languageEnglish
Pages (from-to)575-583
Number of pages9
JournalJournal of Thermal Analysis
Volume33
Issue number3
DOIs
Publication statusPublished - Sep 1988

Fingerprint

Hematite
hematite
Iron oxides
iron oxides
Kinetics
oxides
kinetics
Reaction rates
reaction kinetics
Ferrosoferric Oxide
Reducing agents
Magnetite
magnetite
Reducing Agents
Carbon Monoxide
Nucleation
reactivity
ferric oxide
nucleation
Gases

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Engineering(all)

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TG study on the reduction kinetics of hematite and iron oxide-containing wastes. / Pap, I. S.; Szépvölgyi, J.; Bertóti, I.; Mink, G.; Székely, T.

In: Journal of Thermal Analysis, Vol. 33, No. 3, 09.1988, p. 575-583.

Research output: Contribution to journalArticle

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