Abstract:Three methods of chemical analysis, X-ray diffraction and scanning electron microscopic microanalysis were utilized to analyze basic physicochemical properties of copper smelting slag. Thermodynamic computing software was used for theoretical calculation of metal compounds to be recovered from copper smelting slag. 100 kW induction furnace and corundum-lined graphite crucibles of silicon carbide were used to carry out 10 kg-grade experiment on comprehensive recovery of valuable metals from copper smelting slag. The results show that 91.06% of Cu in slag exists in form of sulfides. With 10% of anthracite and 10% of pyrite blended in feeds, tailings with Cu, Zn and Pb content of 0.28%, 0.0062% and 0.013% respectively are obtained after holding for 120 min. To achieve a more cost-effective comprehensive recovery, 6% of copper smelting dust is mixed in feeds along with an anthracite blend ratio of 3% and pyrite blend ratio of 3%, tailings with Cu, Zn and Pb content respectively of 0.39%, 0.028% and 0.049% are obtained after holding for 70 min.