초록

Disclosed is a method for recovering valuable metals from scrap including the steps of melting the initial scrap feed, carburizing the melt, solidifying the carburized melt, and recovering the valuable metals from the resulting material by ammoniacal leaching thereof.

대표청구항 ▼

A method for treating certain metal scraps which comprises: providing an initial scrap feed containing the combination of (a) at least one metal selected from the group consisting of nickel, cobalt and mixtures thereof, and (b) at least one refractory metal selected from the group consisting of chro

A method for treating certain metal scraps which comprises: providing an initial scrap feed containing the combination of (a) at least one metal selected from the group consisting of nickel, cobalt and mixtures thereof, and (b) at least one refractory metal selected from the group consisting of chromium, molybdenum, tungsten and mixtures thereof; melt carburizing said feed sufficiently to at least predominantly insolubilize the metals of group (b) with respect to the ammoniacal leach step below and to render the group (a) metals of those alloys contained in said feed which are resistant to solution in ammoniacal leach liquor soluble in said ammoniacal leach step; and leaching the melt carburized feed with an ammoniacal leach liquor having dissolving power for the metals of group (a), whereby said metals of group (a) pass predominantly into solution in said liquor while the metals of group (b) remain predominantly as undissolved leach residue.