目前许多韩国公司使用含银或者铜的导电涂料，它们主要是从美国进口的。
Currently many Korean companies use the conductive paints comprising silver or copper, which are mainly imported from America.
研究了从含钯银铜的废料中分离回收钯和银。
Recovery of palladium and silver from waste containing palladium, silver and copper are studied.
从铅锑复合矿中综合回收产出的粗铜阳极含铜低，含铅银锑铋等杂质很高，无法采用常规电解方法电解。
The copper recovered from jamesonite concentrate contains too much impurities like lead, sliver, antimony and bismuth, and can't be refined with normal electrolysis process.
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