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Sohn International Symposium on Advanced Processing of Metals and Materials August 27-31 2006 Phase Relations of Ferrous Calcium Sicilate Slag and its Possible Application in the Industrial Practice (Keynote Lecture)
Ian McBow¹ ; Akira Yazawa ² ; Florian Kongoli ¹;
¹FLOGEN Technologies Inc,1255 Laird Blvd., Ste.388, Mont-Royal, Quebec, Canada
²Tohoku University, 16-32, Niizaka, Aoba-ku, Sendai, 981-0934 JAPAN

Keywords : Ferrous calcium silicate, slag, FeO, CaO, SiO2, liquidus, liquid regions, minor components, phase relations, industrial practice, calcium ferrite

ABSTRACT

The so-called "fayalite" slag, despite problems associated with it, is the most widely used slag in copper smelting processes. Thirty years ago, in order to overcomes some drawbacks of this slag a new "calcium ferrite" slag was proposed especially for continuous copper converting. Since both slags have strong and weak points depending on the field of their application about 8 years ago another new "ferrous calcium silicate" slag was proposed that is expected to solve the drawbacks of each slag. This new slag is defined as mainly consisting of FeOx, CaO and SiO2 as its main components but it can practically have several combinations of these constituents. In order to determine the best area of this slag for possible industrial application the quantification of phase relations is an important subject. In this paper the work carried out by the authors in quantifying through an original physical model the phase relations, liquidus surface, liquidus regions, behavior of solid phases and the effect of minor components is reviewed. Several special compositions of this slag have been identified and discussed for possible applications in the industrial practice.

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