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Dezincing of zinc alloy coated steel scrap in hot caustic soda
Author(s) -
Wijenberg Jacques,
Droog John
Publication year - 1999
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199905631
Subject(s) - galvannealed , scrap , metallurgy , zinc , galvanization , materials science , caustic (mathematics) , die (integrated circuit) , alloy , chemistry , composite material , physics , layer (electronics) , mathematical physics , nanotechnology
Dezincing of zinc and zinc alloy coated industrial scrap could make a useful contribution to steel recycling. Earlier studies have demonstrated the possibility of dezincing hot dip galvanised steel scrap in hot caustic soda. The work is now extended to dezincing of zinc alloy coated steel, with the emphasis on galvannealed steel. The zinc dissolution rate of galvannealed steel turns out to be higher than that of hot dip galvanised steel. However, the residual zinc content is higher. This zinc is contained in a loosely bound film of black dust. Methods to remove the residual zinc can be found in mechanical treatments such as dezincing in a rotating drum.