Laboratory investigation of Waelz slag stabilization |
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| Institution: | 1. Politecnico di Milano, Dipartimento di Meccanica, Via La Masa 1, 20156 Milano, Italy;2. Laboratorio Chimico Di Landro (DILAB) S.a.s., Viale Europa 26/B, 26013 Crema (CR), Italy;1. Department of Mining Engineering, Faculty of Engineering, Pontificia Universidad Católica de Chile, Chile;2. Department of Physics, Faculty of Science, Universidad de Santiago de Chile, Chile;1. University of Newcastle, UK;2. University of Warwick, UK;1. Mining Engineering Department, Faculty of Engineering, Pontificia Universidad Catolica de Chile, Chile;2. Physics Department, Faculty of Science, University of Santiago, Chile;3. Metallurgical Engineering Department, College of Mines and Earth Sciences, University of Utah, USA |
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| Abstract: | Electric Arc Furnace dusts are considered hazardous waste due to their high heavy metals content (zinc, lead, etc.). The Waelz process is one of the most efficient technologies, in terms of capacity and quality, able to recover nearly the 90% of zinc contained in such EAF dusts. Unfortunately, the resulting slag still has eco-compatibility problems, although its mechanical and chemical properties are suitable for civil engineering applications. Stabilization tests, by quartz addition, were performed on EAF dusts in a laboratory furnace. Temperature, treatment time and cooling rate were varied in order to define the best conditions for regulating the formation of a stable microstructure able to hinder the release of substances. Microstructural characterization was carried-out using SEM and XRD analysis. Leaching tests were performed according to EN 12457-2 standards and water analyses were performed using ICP-OES. The best chemical stability was achieved when dust powders were mixed with 20% of silica and water-cooled. |
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| Keywords: | EAF dusts Waelz process Waelz slag Stabilization process Silica addition Leaching test |
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