Progress in caustic dezincing of galvanized scrap

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In response to the worldwide increase in consumption of galvanized steel for automobiles in the last fifteen years, and the cost of environmental compliance associated with remelting larger quantities of galvanized steel scrap, processes are being developed to separate and recover the steel and zinc from galvanized ferrous scrap. In the process discussed here, zinc is dissolved from the scrap in hot caustic and is recovered electrolytically as dendritic powder. The dezinced ferrous scrap is rinsed and used directly. The process is effective for zinc, lead, and aluminum removal on loose and baled scrap and on all types of galvanized ... continued below

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11 p.

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Dudek, F.J.; Daniels, E.J. & Morgan, W.A. August 1, 1997.

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Description

In response to the worldwide increase in consumption of galvanized steel for automobiles in the last fifteen years, and the cost of environmental compliance associated with remelting larger quantities of galvanized steel scrap, processes are being developed to separate and recover the steel and zinc from galvanized ferrous scrap. In the process discussed here, zinc is dissolved from the scrap in hot caustic and is recovered electrolytically as dendritic powder. The dezinced ferrous scrap is rinsed and used directly. The process is effective for zinc, lead, and aluminum removal on loose and baled scrap and on all types of galvanized steel. Pilot testing has been conducted in Hamilton, Ontario for batch treatment of 900 tonnes of mostly baled scrap. A pilot plant in East Chicago, Indiana, now in its second generation, has dezinced in a continuous process mode about 1,800 tonnes of loose clips and shredded stamping plant scrap; this scrap typically has residual zinc below 0.05% and sodium dragout below 0.001%. This paper reviews caustic dezincing pilot plant performance and economics.

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11 p.

Notes

OSTI as DE97053459

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  • 10. international iron and steel conference, Toronto (Canada), 2-4 Jun 1997

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  • Other: DE97053459
  • Report No.: ANL/ES/CP--93505
  • Report No.: CONF-9706182--
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 542022
  • Archival Resource Key: ark:/67531/metadc695114

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • August 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Dec. 16, 2015, 5:36 p.m.

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Dudek, F.J.; Daniels, E.J. & Morgan, W.A. Progress in caustic dezincing of galvanized scrap, article, August 1, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc695114/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.