Abstract

The feasibility of recycling of Ag from Pb-Cu-Ag alloy by vacuum distillation was analyzed at six different temperatures (973, 1023, 1073, 1123, 1173, and 1223K) under the vacuum of 1–20Pa. The saturated vapor pressure, separation coefficient and gas-liquid phase equilibrium were calculated. The results show that this method is feasible. The influence of distillation temperature and time on the result of experiment was also investigated. The results show that Ag content in the residue and Pb and Cu content in the volatile increase with the increasing distillation temperature and time. The enriching times of Ag and the removal rate of Pb are larger than 32 and 99.9%, respectively at 1223K corresponding to 30–120min. The optimum distillation condition is the temperature of 1223K and time 60 min, and the high purity of Ag (93.3 wt. %) is reached.

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