摘要
许多文献及专著认为铜在粗铅分步结晶精炼中不能除去。但是，这一结论与Ｐｂ－Ｃｕ相图有矛盾。我们最近的实验证明，铜在粗铅分步结晶精炼中的行为因其含量不同而有两种情况：若粗铅中含铜量大于０．０７％，那么铜在铅的分步结晶精炼中将分别进入富银的铅熔体和脱银后的铅晶体中，则铜不能通过分步结晶方法除去；若粗铅中的铜含量低于０．０７％，那么铜就可以通过分步结晶精炼彻底从铅中除去而富集于富银的铅熔体中。
\ A lot of literatures and works reported that copper could not be removed from lead bullion by fractional crystallisation, which was incompatible with the phase diagram for PbCu binary system Our recent experimental results show that the behavior of copper in the refining of lead by fractional crystallisation has two cases according to different copper contents: when copper content in the lead melt is higher than 007%, some copper goes into the PbAg alloy, and some into the lead crystals, so that purified lead always contains some copper; when copper content in the lead melt is lower than 007%, impurity copper can satisfactorily be removed from lead melt by fractional crystallisation, and enriches in the silvercontaining melt \
出处
《有色金属》
CSCD
1998年第2期67-70,共4页
Nonferrous Metals
关键词
铜
粗铅
精炼
分步结晶
炼铅
copper
lead bullion
refine
fractional crystallisation
