Report of Investigations 8169: Recovering Gold from Scrap Electronic Solders by Drossing

Details

• Personal Author:
  Ferrell, Edward F.
• Corporate Authors:
  United States. Bureau of Mines
• Description:
  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. [Description provided by NIOSH]
• Subjects:
  Metals Occupational Health Recycling Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• ISSN:
  1066-5552 (print)
• Publisher:
  United States. Bureau of Mines
• Document Type:
  Text
• Genre:
  Case Report
• Rights:
  Public Domain
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  RERC - Reno Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  19 pdf pages
• NIOSHTIC Number:
  nn:10007808
• NTIS Accession Number:
  PB-258107
• Citation:
  NTIS: PB 258 107 :9 pages
• Federal Fiscal Year:
  1976
• Peer Reviewed:
  False
• Source Full Name:
  NTIS: PB 258 107
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:267b1e98c8635a794e49262ef19ce5c674a9341ff03339529f1b131291f16e3be757963cab15b49666bf137d4b90e1280a6623ac6a50ba4ec40eb7bc284524c2
• Download URL:
  https://stacks.cdc.gov/view/cdc/201859/cdc_201859_DS1.pdf
• File Type:
  [PDF - 478.68 KB ]