RAFFINAGE DE MITRAILLE

摘要

1289265 Refining scrap VEREINIGTE DEUTSCHE METALLWERKE A G 19 April 1971 [19 May 1970] 24581/71 Heading C7D Scrap contaminated with adhering solder containing Pb, Sn and Zn is refined by heating under a vacuum to melt and evaporate only the solder. The scrap may be a copper-nickel alloy. Oxygen may be present during treatment to form oxides of lower boiling point than the corresponding metals. After refining the scrap may be melted. An induction furnace may be used.