Liquidus surface of newly defined "ferrous calcium silicate slag" and its metallurgical implications

Ferrous calcium silicate (FCS) slag is defined as a new slag consisting of FeOX, CaO and SiO2 with a nominal composition near the di-calcium silicate surface. This slag is expected to solve the drawbacks of the "fayalite" and ferrite slags. However, detailed knowledge of the liquidus surface of this new slag is not available in the literature. Based on the authors' precedi ng article, the available liquid region of FCS slag is confirmed under rele vant oxygen potentials along with the effect of minor oxides. The liquidus temperature is lowered by dissolution of copper oxide, and thus, FCS slag s eems to be useful especially in the converting and direct smelting of coppe r. The obtained knowledge should also be useful for various metallurgical p rocesses.