从理论上分析了采用真空蒸馏法分离贵铅中铅、银、铜、铋、锑的可行性，研究了蒸馏时间、蒸馏温度对贵铅中金属分离效果的影响规律。实验结果表明，当系统压力在10~20 Pa，温度在800℃以上，保温时间≥2 h时，铅和铋的挥发率接近100%，银和锑的挥发率随温度的升高、保温时间的增长而逐渐增大。当温度为850℃，保温时间为2 h时，所得残留物中铅、银、铜、铋、锑的含量分别为0.21%、45.31%、13.24%、0.0001%、33.6%，挥发物中铅、银、铜、铋、锑的含量分别为46.15%、0.236%、0.022%、8.87%、35.4%。
Availability of vacuum distillation for the separation of lead, silver, copper, bismuth and stibium in precious lead was studied by both theoretical analysis and experiments. Experimental results demonstrate that the evaporation rate of Pb and Bi is close to 100% when the temperature is above 800℃, holding time is more than 2 h and system pressure is 10 to 20 Pa. Meanwhile, the evaporation rate of Ag and Sb increase with the temperature and holding time being increased. When the temperature is 850℃ and holding time is 2 h, the contents of Pb, Ag, Cu, Bi and Sb in the residue are 0.21%, 45.31%, 13.24%, 0.0001% and 33.6%, respectively. Besides, the contents of Pb, Ag, Cu, Bi and Sb in the volatile are 46.15%, 0.236%, 0.022%, 8.87% and 35.4%, respectively.
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