The Reactions of Titanium and Silicon with Al2O3-CaO-CaF2 Slags in the ESR Process

The reactions of titanium and silicon with slags of the system alumina-calcium oxide-fluorspar were calculated. The calculations were confirmed by melts in a laboratory induction furnace and also through statistical calculations of 320 heats of 500 mm □ (3,6 ton) ingots for the Ti–Al2O3 reaction and of 100 ESR heats of the same ingot size for the Si–Al2O3 reaction. By statistical evaluation of all heats the dependence of the aluminum and titanium or silicon contents for different TiO2 or SiO2 contents of the slags were determined. By application of these data the losses of Ti or Si by a reaction with alumina can be prevented.