Galvanizing Residue and Electrical Arc Furnace (EAF) Dust


Kaya M.

in: Recycling Technologies for Secondary Zn-Pb Resources, Muammer Kaya, Editor, Springer, London/Berlin , New York, pp.71-150, 2023

  • Publication Type: Book Chapter / Chapter Research Book
  • Publication Date: 2023
  • Publisher: Springer, London/Berlin 
  • City: New York
  • Page Numbers: pp.71-150
  • Editors: Muammer Kaya, Editor
  • Eskisehir Osmangazi University Affiliated: Yes

Abstract

Steel and zinc (Zn) make a good coupling during their service life and are easily recyclable. Zn coatings lengthen the useful life of steel products and structures and keep the steel performing at its peak condition. When the Zn-coated steel is scrapped and recycled the steel and Zn have new lives. Therefore, the combination of steel and Zn is especially fortunate because it is possible to separate and recover both the original metals. This means that galvanized steel and electro-Zn coated steel sheets are recyclable materials which can be reused to make further contributions to the life of society. The metals can be separated because Zn is naturally much more volatile than steel. When scrap Zn coated sheet is melted in the steel-making process, the scrap steel is turned into new steel for reuse. The Zn enters dust which is recovered from the furnace. They form a secondary resource of Zn which we can use again, alongside other Zn raw materials. The recycled Zn is also used in Zn-coated steel, with a new life in new products, such as cars, buildings and construction products. This cycle, in which Zn and steel are infinitely renewable, contributes to the virtuous circle of recycling for sustainability.