Phase equilibria in the ZnO-rich area of the Fe-Zn-O system in air

Hansson, Robert, Hayes, Peter C. and Jak, Evgueni (2004) Phase equilibria in the ZnO-rich area of the Fe-Zn-O system in air. Scandinavian Journal of Metallurgy, 33 5: 294-304. doi:10.1111/j.1600-0692.2004.00696.x


Author Hansson, Robert
Hayes, Peter C.
Jak, Evgueni
Title Phase equilibria in the ZnO-rich area of the Fe-Zn-O system in air
Journal name Scandinavian Journal of Metallurgy   Check publisher's open access policy
ISSN 0371-0459
Publication date 2004
Sub-type Article (original research)
DOI 10.1111/j.1600-0692.2004.00696.x
Volume 33
Issue 5
Start page 294
End page 304
Total pages 11
Editor J O Edstroem
Place of publication Denmark
Publisher Blackwell Munksgaard
Collection year 2004
Language eng
Subject C1
291301 Process Metallurgy
640205 Other non-ferrous ores (e.g. copper, zinc)
091407 Pyrometallurgy
Abstract The phase equilibria in the Fe-Zn-O system in the range 900-1580degreesC in air have been experimentally studied using equilibration and quenching techniques. The compositions of the phases at equilibrium were determined using electron probe X-ray microanalysis (EPMA). The ferrous and ferric bulk iron concentrations were measured with a wet chemical analysis using the ammonium metavanadate technique. X-ray powder diffraction analysis (XRD) was used to characterise the phases. Iron oxide dissolved in zincite was found to be present principally in the ferric form. The XRD analysis and the composition measurements both indicate that zincite is the only phase stable in the ZnO-rich area in the range of conditions investigated. The solubility of the iron oxide in zincite rapidly increases at temperatures above 1200degreesC; the morphology of the zincite crystals also sharply changes between 1200 and 1300degreesC from rounded to plate-like crystals. The plate-like zincite forms a refractory network-the type of microstructure beneficial to the Imperial Smelting Process (ISP) sinter performance. The software program FactSage with a thermodynamically optimised database was used to predict phase equilibria in the Fe-Zn-O system.
Keyword Metallurgy & Metallurgical Engineering
Epma
Fe-zn-o
Isp
Phase Equilibria
Quenching
Xrd
Pbo-zno-fe2o3-(cao+sio2) System
Furnace Sinters
Cao/sio2=0.35
Weight
Lead
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 04:18:07 EST