论文部分内容阅读
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。
Many literatures and monographs believe that copper can not be removed during the fractional crystallization of crude lead. However, this conclusion is contradictory to the Pb-Cu phase diagram. Our recent experiments show that there are two cases of behavior of copper in the fractional crystallization of crude lead because of its different contents: If the content of copper in the crude lead is more than 0.07%, then the copper is fractionally refined in the lead Will enter the silver-rich lead melt and desilvering lead crystals, respectively, then the copper can not be removed by fractional crystallization; if the copper content in the crude lead is less than 0.07%, copper may be fractionally crystallized Refining is completely removed from the lead and enriched in the silver-rich lead melt.