The complexity in treating environmentally harmful impurities such as As, Sb, Bi from the base metal
matte or metal in the smelting stage are responsible for the high cost of the refining process. The
impurity capacities (such as arsenic, antimony and bismuth) of slags were calculated a priori using
Reddy-Blander (RB) model. The capacity predictions were for a wide range of matte and slag
compositions in copper smelting conditions. The calculated impurities capacities and impurity
distribution ratios results are in good agreement with the available experimental and industrial slags
data. The a priori knowledge of impurities is useful for reduction of energy consumption and
enhanced environmental control in the current and future non-ferrous metal processes.