Method of separating ferritic steel or ductile iron from certain

Details Method of separating ferritic steel or ductile iron from certain Method of separating ferritic steel or ductile iron from certain

1977-01-28

1978-10-31

Vertiz, O. R.

Metal treatment

Compositions

Heat treating

148 16, 148 165, 148144, 241 23, 241 24, C21D 144

Patent

active

041232941

ABSTRACT:
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.

REFERENCES:
patent: 3231433 (1966-01-01), Van Mater et al.
patent: 3344817 (1967-10-01), Connard
patent: 3351684 (1967-11-01), Lincoln
patent: 3885744 (1975-05-01), Drage
patent: 4006042 (1977-02-01), Kieferle

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