Community Research and Development Information Service - CORDIS

Abstract

The need to provide recycling strategies for organic and metallic coated steels is becoming more pressing, as the direct charging of these materials can produce problematic emissions. This project has evaluated a possible alternative approach, namely, the removal of strip coatings prior to the steelmaking stage. The removal of organic/metallic coatings can be achieved through the use of physical and chemical treatments. Shot blasting and wheel stripping will remove strip coatings, however, these methods are only useful for treating flat scrap pieces. Crushing and stretching of the strip will treat a wider range of coated materials leaving the surface in a fit condition for subsequent wet chemical treatments. Simple and potentially low cost wet chemical treatment routes which use caustic and saltwater liquors have been examined. Direct electrolytic recoveries of zinc from waste liquors containing tramp metals were also examined. Products were found to be contaminated, particularly if lead and copper were present in solution. Tramp precipitation or pre-electrolysis could be used to minimize these effects.

Additional information

Authors: COSGROVE M, British Steel plc, London (GB);JOHNS D, British Steel plc, London (GB)
Bibliographic Reference: EUR 18399 EN (1998) 109pp., ECU 18.50
Availability: Available from the (2)
ISBN: ISBN 92-828-4469-2
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