Zinc-based desulfurizer scrap and copper-zinc-based catalyst synergistic vacuum carbothermal extraction of zinc
To solve the problems of long process and large amount of pollutants in metal extraction of waste zinc-based desulfurizer and copper-zinc-based catalyst,a technical method of efficient and clean synergistic separation and utilization of the copper and zinc in the two materials by vacuum carbothermal reduction method was proposed.On the basis of the characterizations of the chemical composition and main phase of the waste desulfurizer and copper-zinc-based catalyst,the experimental study of vacuum carbothermal synergistic extraction and separation of copper and zinc was carried out.The optimum zinc volatilization process conditions were obtained by adjusting the heating temperature,holding time and batch ratio,and the process mechanism was analyzed in depth.The results showed that the waste desulfurizer with ZnS as the main phase and the scrap copper-zinc-based catalyst with CuO and ZnO as the main phase could effectively reduce and volatilize the zinc in the two materials during vacuum carbothermal reduction.The mixture of copper-zinc-based catalyst,desulfurizer,and carbon with C∶(ZnO+CuO)as 1∶1(molar ratio)and CuO∶ZnS as 2∶1(molar ratio)was heated to 1100℃for 60min,the reduction and volatilization rate of zinc reached 99.56%,and the copper grade in the reduced slag was 59.46%with the copper existing mainly as Cu1.96S,which could be used as ice copper blowing raw materials.
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