Evaporation and its Effects on Physico-Chemical Properties of PbO-containing Slag

Abstract

PbO as well as other volatiles will evaporate at high temperature. In the measure of relevant slag property, the slag will be kept at high temperature for a long time (even several hours). The continuous evaporation will result in uncertainty of the measured results. In another point of view, that means the measured result is no longer in consistent with the pre-determined slag composition, but a new one changed obviously. For high or medium PbO content slag, the weight loss can reach to 20∼40 % at high temperature. The effect is not negligible. In this work, the evaporation and physicochemical property (melting point and viscosity) measurement of typical PbO-containing slag were jointly analyzed based on calculation, TG-DSC, melting temperature and viscosity measurement. A deviation method based on traditional measurement ways was suggested and practiced. It is proved that to take physicochemical property value with traditional method and the get the in-time composition to match the measured values is feasible. how obtain in-time composition is also discussed and tried. The work will be of extensive reference significance to other slag system with higher volatiles.