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Recovering Gold from Scrap Electronic Solders by Drossing.

Authors
Ferrell-EF
Source
NTIS: PB 258 107 :9 pages
Link
NIOSHTIC No.
10007808
Abstract
Gold was recovered from scrap electronic 60-40 (tin-lead) solders by drossing with aluminum or zinc at elevated temperatures. The gold, together with other metallic impurities, collected in the drossphase which could then be separated from the molten solder by skimming or filtering. Drossing upgraded the gold concentration by a factor of 10. Further upgrading was achieved by a combination of steps including an oxidation roast and either a combined cyanidation- amalgamation treatment or an aqua regia leach. The gold was then recovered in highly concentrated form from the aqua regia or cyanide solutions by cementation and from the amalgam by volatilization or dissolution of the mercury. The solder was purified by reaction with naoh to remove dissolved aluminum or with sncl2 to remove dissolved zinc.
Publication Date
19760101
Document Type
IH; Report of Investigation;
Fiscal Year
1976
NTIS Accession No.
PB-258107
NTIS Price
A02
Identifying No.
RI 8169
NIOSH Division
RERC;
Source Name
NTIS: PB 258 107
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