Zinc Vaporization and Self-reduction Behavior of Industrial Waste Residues for Recycling to the HIsarna Furnace

Abstract Within the steelmaking industry, a large amount of zinc-bearing waste is produced which cannot be effectively treated through integrated steel mills. Concurrently, zinc smelters generate residues containing significant amounts iron and are stored or landfilled. The concentration inhibits its recycling to blast furnace but insufficient sent directly producers. Consequently, means up-concentration required. pilot HIsarna ironmaking has shown potential for processing secondary iron-bearing resources. Furthermore, can concentrated in off-gas flue dust, providing an enriched input smelters. recyclability (BF) basic oxygen (BOF) dust ‘goethite’ residue from industry been studied. materials have comprehensively characterized their reduction–vaporization behavior, investigated. Individual samples were tested at temperatures up 1300 °C. Here, it was that minimal reduction volatilization occurred goethite BOF samples. Conversely, even 1000 °C, BF showed complete removal within 30 min. This due high carbon content (40 wt%) act as reductant. mixtures with It 30:70 20:80 suitable recovering gas phase fully reducing contained iron. Graphical