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Liquidus Surface of FeOx-SiO2-CaO Slag Containing Al2O3, MgO and Cu2O at Various Oxygen Partial Pres Sixth International Conference on Molten Slags, Fluxes and Salts, Stockholm-Helsinki
Akira Yazawa ¹ ; Florian Kongoli ² ;
¹Tohoku University, 16-32, Niizaka, Aoba-ku, Sendai, 981-0934 JAPAN
²FLOGEN Technologies Inc,1255 Laird Blvd., Ste.388, Mont-Royal, Quebec, Canada

Keywords: Phase diagrams, slags, thermodynamics, modeling, solution, non-ferrous, pyrometallyrgy, Al2O3, MgO,

ABSTRACT

Liquidus surface of FeO-Fe2O3-SiO2-CaO system is of special importance in general pyrometallurgy. It determines several industrial slags, such as "fayalite" slag, calcium ferrite slag, acidic and basic steel making slags as well as the newly proposed ‘ferrous calcium silicate slag', which are all nominally based on this system. Nevertheless the liquidus surface of this system has been studied only in equilibrium with metallic iron or in air and the data at intermediate oxygen partial pressures are almost missing. In reductive smelting processes the above-mentioned slags were based on the liquidus surface of FeO-Fe2O3-SiO2-CaO system in equilibrium with metallic iron. In oxidative matte smelting and in today's modern trends of non-ferrous smelting such as continuous converting or white metal production, the characterization of the liquidus surface of this system at intermediate oxygen partial pressures becomes imperative. Furthermore the effect of minor oxides on the liquidus surface of this system has not been studied at higher oxygen potentials and confusing conclusions are found in literature even for low oxygen potentials. In this work a quantitative description of the liquidus surface of FeO-Fe2O3-SiO2-CaO slag containing Al2O3, MgO and Cu2O is carried out by means of a thermodymamic model at various oxygen partial pressures. Through a new type of easy-to-understand multicomponent phase diagrams it is shown that important differences exist between the liquidus surfaces of this system in reductive and oxidative conditions. It is also shown that minor components can have fundamentally different effects in reductive and oxidative conditions.

Cite this article as:
Akira Yazawa, Florian Kongoli (2000). Liquidus Surface of FeOx-SiO2-CaO Slag Containing Al2O3, MgO and Cu2O at Various Oxygen Partial Pres. Sixth International Conference on Molten Slags, Fluxes and Salts, Stockholm-Helsinki.

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