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. |