Progress in caustic dezincing of galvanized scrap

Conference · Fri Aug 01 04:00:00 EDT 1997

OSTI ID:542022

Dudek, F J; Daniels, E J ^[1]; Morgan, W A ^[2]

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1. Argonne National Lab., IL (United States)
2. Metal Recovery Technologies, Inc., East Chicago, IN (United States)

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.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE Assistant Secretary for Energy Efficiency and Renewable Energy, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 542022
• Report Number(s): ANL/ES/CP--93505; CONF-9706182--; ON: DE97053459
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ALUMINIUM
BASES
CHEMICAL DECLADDING
LEAD
MATERIALS RECOVERY
RECYCLING
SCRAP METALS
STEELS
ZINC