Zinc Reduction/Vaporisation Behaviour from Metallurgical Wastes
Timothy Kerry (TU Delft - (OLD) MSE-3)
Alexander Peters (Student TU Delft)
Evangelos Georgakopoulos (TU Delft - (OLD) MSE-3)
A. Hosseini (TU Delft - (OLD) MSE-3)
SE Offerman (TU Delft - (OLD) MSE-1)
Y. Yang (TU Delft - (OLD) MSE-3)
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Abstract
The steelmaking industry produces large quantities of zinc-bearing wastes of varying forms that cannot be treated through integrated steelmaking processes. Simultaneously, by-products of the zinc industry containing great amounts of iron and zinc are stored or landfilled. The amount of zinc in these materials is generally below that which is of value to be recycled directly to the zinc smelter, consequently a method of concentration is required. Tata Steel owns and operates the pilot HIsarna ironmaking plant which, due to its high raw materials flexibility, is attractive for the purpose of processing secondary iron sources. Furthermore, it can facilitate the simultaneous recovery of a zinc-enriched flue dust. The high temperature behaviour of various waste materials will be presented with regards to their recyclability in the HIsarna furnace. Blast furnace (BF) sludge and basic oxygen furnace (BOF) sludge from Tata Steel IJmuiden have been studied along with ‘goethite’ waste produced by Nyrstar. The various input materials have been comprehensively characterised and their reduction/vaporisation behaviour recorded. Mixed samples have been produced and tested in order to define the most appropriate form of delivery of these materials to the HIsarna furnace.