Pb-Pd合金真空蒸馏

Vacuum Distillation of Pb-Pd Alloy

研究了Pb-Pd合金真空蒸馏的基本规律.结果表明,含Pd10%(ω)的Pb-Pd合金在1250K及35Pa条件下进行一次蒸馏,蒸馏时间延长至4h后Pb脱除率接近定值(92.5%),一次蒸余物中的Pd含量保持在60%左右.将一次蒸余物在1523K下进行二次蒸馏,所得二次蒸余物中Pd含量仍保持在60%左右.真空蒸馏工艺处理Pb-Pd合金,将大量Pb脱除并直接得到纯金属Pb,同时富集了Pd,减少了后续提Pd工艺的处理量.

The basic rule of vacuum distillation of Pb-Pd alloy was investigated. The primary distillation results show that the removal rate of Pb was close to 92.5% and the Pd content in the primary distillation residue remained at about 60% when the Pb-Pd alloy containing 10%（ω） Pd was distillated for more than 4 h at 1250 K and 35 Pa. After the secondary distillation at 1523 K, the Pd content in the secondary residue was still maintained at about 60%. In the vacuum distillation process of Pb-Pd alloy, most of Pb could be separated and collected as metallic Pb, while Pd was enriched in the residue. As a result, the material amount of further treatment for extraction of Pd was reduced remarkably by this method.