Abstract:Based on the basic composition characteristics of waste cathode carbon block produced by electrolytic aluminum process, a new method of reducing converter copper slag by using waste cathode carbon block in electrolytic aluminum process is proposed. According to the thermodynamic analysis, the effects of the amount added of waste cathode carbon, SiO2 and nitrogen injection flow on the dilution of converter slag were investigated. The results show that when the dilution temperature is 1300 ℃, the injection time are 20 minutes and the holding time are 60 minutes, the amount added of SiO2 is 3.4% (Fe/SiO2 is 2.0), the amount added of waste cathode carbon is 2.8% and the nitrogen injection flow is 300 mL/min, the residual copper content in the final slag can be reduced from 5.70% to 0.45%, and the F from the waste cathode carbon block fixation rate is 96.3% and realizes its harmless and resourceful treatment.