Mechanisms of the reduction of zinc ferrites in H-2/N-2 gas mixtures

Tong, Lee Fui and Hayes, Peter (2007) Mechanisms of the reduction of zinc ferrites in H-2/N-2 gas mixtures. Mineral Processing And Extractive Metallurgy Review, 28 2: 127-157. doi:10.1080/08827500601012878

Author Tong, Lee Fui
Hayes, Peter
Title Mechanisms of the reduction of zinc ferrites in H-2/N-2 gas mixtures
Journal name Mineral Processing And Extractive Metallurgy Review   Check publisher's open access policy
ISSN 0882-7508
Publication date 2007-04
Sub-type Article (original research)
DOI 10.1080/08827500601012878
Volume 28
Issue 2
Start page 127
End page 157
Total pages 31
Editor S. K. Kawatra
Place of publication Philadelphia, P.A., U.S.A.
Publisher Taylor & Francis Inc
Collection year 2008
Language eng
Subject 291301 Process Metallurgy
670899 Other non-ferrous metals (e.g. copper, zinc)
091407 Pyrometallurgy
Abstract The rates of reduction of dense pure zinc ferrite and zinc ferrite containing 1 wt% of CaO, MgO, MnO, and Al2O3 in solid solution reduced with H-2/N-2 gas mixtures have been investigated at temperatures between 500 and 1100 degrees C. The rate measurements obtained in these studies were complemented with the structural characterization of the partially reduced zinc ferrite samples. The presence of impurity oxides in ZnFe2O4 solid solution influenced the conditions for formation of the porous iron morphology. Where porous iron-type microstructures were formed during the reduction reaction, the pore structure of the reduced samples was found to be dependent on reduction temperature, hydrogen partial pressure, and type of impurity oxide added into the solid solution. The reduction plots of zinc ferrite solid solutions exhibited an initial linear rate followed by a gradual decrease in rate with increased percentage reduction. The changes in growth mechanisms and reduction kinetics that occur with changing reduction conditions are discussed.
Keyword Metallurgy & Metallurgical Engineering
Mining & Mineral Processing
reduction kinetics
solid solutions
zinc ferrites
Q-Index Code C1
Q-Index Status Confirmed Code

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Created: Mon, 18 Feb 2008, 16:34:26 EST