Modeling of impurity distribution between mattes and slags

摘要

A thermodynamic model for a priori predictions of impurity distribution ratio between the copper and nickel mattes and slags was developed based on an extension of the Reddy-Blander capacity model. The impurity distribution ratio for As, Sb and Bi was calculated a-priori considering the impurity capacity model in the FeO-FeO_(1.5)-MgO-CuO_(0.5)-NiO-SiO_2 slag at 1573 K. The results showed an excellent agreement between the model calculated data, and the reported experimental distribution ratio of arsenic, antimony and bismuth between the slag and the copper or nickel mattes. These results also suggest that the a-priori As, Sb and Bi distribution ratio model developed here, can be used for prediction in a wide range of multi-component slags, matte grades and pSO_2. Such predictions will be very useful for understanding the behavior of impurities in the current and eventually future non-ferrous metal processes.