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Distribution and analyses of gold and silver in mechanically processed mixed electronic scrap.
Dunning-BW Jr.; Ambrose-F; Makar-HV
USBM 1983 Jan; :1-17
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.
Waste-treatment; Electronic-equipment; Electronic-components; Electronic-circuits; Metal-compounds; Metallurgical-processes; Metallurgy
IH; Report of Investigations
NTIS Accession No.
U.S. Bureau of Mines
Page last reviewed: May 5, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division