Calculation of FeO-TiO2-Ti2O3; liquidus isotherms pertaining to high titania slags
Date
2005
Authors
Fourie D.J.
Eksteen J.J.
Zietsman J.H.
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
During the production of pure TiO2 for the pigment industry, ilmenite, containing 35-60% TiO2, is reduced to high titania slag, containing 70-95% 'TiO2' and pig iron. The high titania slag produced, consists mainly of titanium in different oxidation states and FeO in equilibrium with liquid iron. To predict the phase and chemical reaction equilibria in a furnace, a suitable solution model is required with accurately determined binary interaction parameters, as slag melts tend to behave very non-ideally. This paper investigates two popular slag models, namely, modified quasi-Chemical (MQC) model and the cell model and provides the binary interaction parameters based on recently published data of the ternary system and critically assessed published unary and binary data. Very few modelling results have been published on the ternary Ti-Fe-O system pertaining to high titanium slags. The solution models, with their regressed interaction parameters, can subsequently be implemented in commercial software of the slag-metal phase equilibria to predict how much and which type of solids will precipitate for a given bulk slag chemistry and operating temperature or, alternatively, above which temperature should a furnace be operated to avoid excessive solids precipitation. © The South African Institute of Mining and Metallurgy, 2005.
Description
Keywords
Chemical industry, Computer simulation, Data acquisition, Iron oxides, Phase equilibria, Temperature distribution, Titanium oxides, Binary data, Cell model, Slag chemistry, Titania slags, Slags
Citation
Journal of The South African Institute of Mining and Metallurgy
105
10
105
10