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Electrolytic stripping of tin in an acid fluoborate electrolyte.

Authors
Groetsch-JG Jr.; Gabler-RC Jr.; Wilson-DA
Source
Avondale, MD: U.S. Department of the Interior, Bureau of Mines, RI 8887, 1984 Jan; :1-9
Link
NIOSHTIC No.
10003859
Abstract
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.
Keywords
Materials-recovery; Scrap-metals; Iron-inorganic-compounds; Electrolytes; Tin; Magnetic-separators; Separation; Iron-and-steel-industry
Publication Date
19840101
Document Type
IH; Report of Investigations
Fiscal Year
1984
NTIS Accession No.
PB84-225861
NTIS Price
A02
Identifying No.
RI-8887
NIOSH Division
AVRC
Source Name
Avondale, MD: U.S. Department of the Interior, Bureau of Mines, RI 8887
State
MD
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