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Hydrometallurgical treatment of electronic scrap concentrates containing precious metals.

Authors
Hilliard-HE; Dunning-BW Jr.; Makar-HV
Source
Avondale, MD: U.S. Department of the Interior, Bureau of Mines, RI 8757, 1983 Apr; :1-15
Link
NIOSHTIC No.
10002800
Abstract
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.
Keywords
Aluminum; Concentrates; Copper; Electric devices; Hydrometallurgy; Leaching; Material separation; Materials recovery; Nickel
Publication Date
19830401
Document Type
IH; Report of Investigations
Fiscal Year
1983
NTIS Accession No.
PB83-214429
NTIS Price
A03
Identifying No.
RI-8757
NIOSH Division
AVRC
Source Name
Avondale, MD: U.S. Department of the Interior, Bureau of Mines, RI 8757
State
MD
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