METHOD OF SEPARATING FERRITIC STEEL OR DUCTILE IRON FROM CERTAIN NONFERROUS METALS

摘要

METHOD OF SEPARATING FERRITIC STEEL OR DUCTILE IRON FROM CERTAIN NONFERROUS METALS A method is disclosed for treating scrap metal chips and turnings containing a valuable metal layer of silver, gold, or copper and a ductile layer of ferritic steel or ductile. iron to recover the valuable metal. The chips and turnings are treated by carburization and quenching to embrittle the steel layers and then crushed converting the steel to a small mesh powder which can be screened from larger sized agglomerates of valuable metal insensitive to the embrittling process.