Hydrometallurgical treatment of electronic scrap concentrates containing precious metals.
Hilliard-HE; Dunning-BW Jr.; Makar-HV
Avondale, MD: U.S. Department of the Interior, Bureau of Mines, RI 8757, 1983 Apr; :1-15
The Bureau of Mines investigated hydrometallurgical procedures for removing base metals from mechanically processed fractions of obsolete military electronic scrap. Feed material was a minus 1/4- in nonmagnetic metallic concentrate produced by high-tension separation. Aluminum was extracted from the feed material in the first-stage ambient temperature, 20-wt-pct sodium hydroxide leach, which was followed by incineration to remove organic matter. A portion of the soluble nickel was extracted in the second-stage oxidizing dilute sulfuric acid leach. Copper and the remainder of the soluble nickel were extracted in the third-stage oxidizing concentrated sulfuric acid leach; copper was recovered from the spent leachate by cementation with an iron-base magnetic fraction. The third-stage leach residue and leachate contained essentially all of the precious metal values.
Aluminum; Concentrates; Copper; Electric devices; Hydrometallurgy; Leaching; Material separation; Materials recovery; Nickel
IH; Report of Investigations
NTIS Accession No.
Avondale, MD: U.S. Department of the Interior, Bureau of Mines, RI 8757