It has previously been observed that industrial high-titania slags display a compositional invariance, remaining close to stoichiometric M3O5. The present study focuses on this invariance and the phenomena which may cause it. The invariance was studied using thermochemical calculations and a mechanism is proposed for the observed behaviour. The mechanism suggests that a combination of thermochemical equilibrium and transient slag solidification and melting results in the observed compositional invariance. The proposed mechanism provides new insights and prompts questions about other mechanisms in the smelting process.

Journal of the SAIMM
J.H. Zietsman and P.C. Pistorius
April 2005, vol. 105, no. 4, pp. 229
© SAIMM Journal

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Process mechanisms in ilmenite smelting

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