Abstract
The copper in slag is mainly in the form of Cu2S, and it’s easy to make matte suspended in slag. The sulfur in slag can be removed by oxidative process, and the copper sulfides can be converted into oxides, then the copper can be easily reduced and separated. Thermodynamic calculation by FactSage7.0 shows that the sulfur in slag can be removed by air, while the activity of Cu2O will increase, and the Cu2S cannot be reduced, while Cu2O is easily reduced into metal. The oxidation and reduction of molten copper slag were carried out and agreed well with theoretical calculations. Sulfur in slag can be dropped to 0.23 wt%, and the utilization rate of air is in the range of 14.98–73.39%. The copper recovery rate can reach 83.82% and the residue copper can be reduced to 0.28 wt%.
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