Copper (Cu) slags are potential alternative sources
for the production of Cu and other metals (e.g., Ni,
Co). A Cu-slag produced by Aurubis underwent
reductive smelting and a polymetallic Cu/Fe alloy
was produced. Two process alternatives were
initially examined for the hydrometallurgical
extraction of Cu: (a) leaching with H2SO4 and (b)
leaching with HCl. O2 (g) was used as an oxidant in
both routes. The purpose of the study was to
determine the efficiency of each acid in extracting
Cu and to highlight any challenges during the
leaching process. In the H2SO4 route %wt. Cu
extraction is below 30% and some of the challenges
responsible for this phenomenon are discussed. On
the other hand, the HCl route appears to be more
efficient, with % wt. Cu extraction over 85%.