Report of Investigations 8887: Electrolytic Stripping of Tin in an Acid Fluoborate Electrolyte

Details

• Journal Article:
  Avondale, MD: U.S. Department of the Interior, Bureau of Mines, RI 8887
• Personal Author:
  Gabler, Robert C. Jr. ; Groetsch, John G. Jr. ; Wilson, Donald A.
• Description:
  Municipal solid waste (MSW) contains about 8 pct ferrous metallics, which are typically recovered by magnetic separators at municipal resource recovery facilities. At present, only about 182,500 ton/yr of MSW magnetics are being processed for remelting out of the approximately 11 mmton/yr discarded. The Sn in MSW magnetics makes this material difficult to recycle to the steel industry. An electrolytic method using stannous fluoborate-fluoboric acid for removing Sn was evaluated. Optimum concentrations of Sn in the electrolyte and the effects of impurities such as Al, Cu, Fe, and Pb on Sn recovery from the electrolyte were evaluated. Operating parameters were 60 to 65 g/l fluoboric acid and 20 to 30 g/l Sn using stainless steel electrodes at a current density of 60 a/ft2. Tests were run with postconsumer scrap and MSW magnetics. Good results were obtained with MSW magnetics, after pretreatment by reshredding, magnetic separation, and air classification. The final Sn content of the MSW magnetics scrap was reduced from 0.18 to 0.017 Wt pct. Heat and solvent treatments of MSW magnetics to remove coatings did not significantly improve sn removal beyond that obtained with material that had only been mechanically pretreated. [Description provided by NIOSH]
• Subjects:
  Chemistry Metals Occupational Health Safety
• Keywords:
  Materials-recovery; Scrap-metals; Iron-inorganic-compounds; Electrolytes; Tin; Magnetic-separators; Separation; Iron-and-steel-industry
• Source:
  Avondale, MD: U.S. Department of the Interior, Bureau of Mines, RI 8887, 1984 Jan; :1-9
• Series:
  NIOSH Numbered Publications   ; Mining Publications  
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• Place as Subject:
  Maryland ; OSHA Region 3
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  AVRC - Avondale Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  14 pdf pages
• NIOSHTIC Number:
  nn:10003859
• NTIS Accession Number:
  PB84-225861
• Federal Fiscal Year:
  1984
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:5e1d9b70b53cb88ae1d4c6d9ac46174f8c9ddccaf0a54fa1bfa5d2ca9c3890b9bd717cd737a6433c0446acc9af801b933f5e825c6cbdec77dd873d9dbed10275
• Download URL:
  https://stacks.cdc.gov/view/cdc/10459/cdc_10459_DS1.pdf
• File Type:
  [PDF - 5.05 MB ]