Abstract:With copper oxide concentrate from Kolwezi mining area in Congo (Kinshasa) as raw material, a 1-hour coke reduction smelting experiment was carried out with high calcium slag at 1500 ℃. The research shows that the CaO/SiO2 ratio of 0.55 is appropriate to improve copper recovery. When the CaO/SiO2 ratio is greater than 0.5, the competitive reduction reaction of iron intensifies, resulting in a larger gap between copper recovery and copper reduction. Based on comprehensive consideration, the CaO/SiO2 blending ratio is 0.50 ~ 0.55. Slag viscosity is affected by the change of O/Si ratio and AlO5 -4 Synergistic influence of network supplement.