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Distribution and analyses of gold and silver in mechanically processed mixed electronic scrap.

Authors
Dunning-BW Jr.; Ambrose-F; Makar-HV
Source
USBM 1983 Jan; :1-17
Link
NIOSHTIC No.
10002971
Abstract
The Bureau of Mines investigated the concentration and distribution of precious metals in the various fractions produced from mechanical processing of obsolete military electronic scrap. Whole avionic units, printed circuit cards, and electrical connectors were processed and analyzed. Materials recovered included baghouse lights, wire bundles, magnetics, and metal concentrates from eddy- current and high-tension separation. Higher value fractions were processed by a commercial toll refiner for recovery of gold and silver. Lower value fractions were analyzed by the Bureau. Three fractions, the lights, wire bundles, and metallics from high-tension separation, contained most of the precious metals. Depending on the type of scrap feed, these fractions represented 34 to 60 pct of the original sample weight. Collectively, they represented 68 to 97 pct and 75 to 98 pct of the contained gold and silver, respectively.
Keywords
Waste-treatment; Electronic-equipment; Electronic-components; Electronic-circuits; Metal-compounds; Metallurgical-processes; Metallurgy
Publication Date
19830101
Document Type
IH; Report of Investigations
Fiscal Year
1983
NTIS Accession No.
PB83-250092
NTIS Price
Identifying No.
RI-8788
NIOSH Division
AVRC
Source Name
U.S. Bureau of Mines
State
MD
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