title: The efficiency of quartz addition on electric arc furnace (EAF) carbon steel slag stability.
abstract: Electric arc furnace slag (EAF) has the potential to be re-utilized as an alternative to stone material, however, only if it remains chemically stable on contact with water. The presence of hydraulic phases such as larnite (2CaO SiO2) could cause dangerous elements to be released into the environment, i.e. Ba, V, Cr. Chemical treatment appears to be the only way to guarantee a completely stable structure, especially for long-term applications. This study presents the efficiency of silica addition during the deslagging period. Microstructural characterization of modified slag was performed by SEM and XRD analysis. Elution tests were performed according to the EN 12457-2 standard, with the addition of silica and without, and the obtained results were compared. These results demonstrate the efficiency of the inertization process: the added silica induces the formation of gehlenite, which, even in caustic environments, does not exhibit hydraulic behaviour.
authors.affiliation: Politecnico di Milano, Dipartimento di Meccanica, Via La Masa 1, 20156 Milano, Italy. Electronic address: davide.mombelli@mail.polimi.it.
authors.forename: D
authors.initials: D
authors.lastname: Mombelli
authors.affiliation: Politecnico di Milano, Dipartimento di Meccanica, Via La Masa 1, 20156 Milano, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Mapelli
authors.affiliation: Politecnico di Milano, Dipartimento di Meccanica, Via La Masa 1, 20156 Milano, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Barella
authors.affiliation: Politecnico di Milano, Dipartimento di Meccanica, Via La Masa 1, 20156 Milano, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Gruttadauria
authors.affiliation: Centre des Matériaux des Mines d'Alès (C2MA) -Ecole des Mines d'Alès (Institut Mines Telecom), Avenue de Clavières 6, 30100 Alès cedex, France.
authors.forename: G
authors.initials: G
authors.lastname: Le Saout
authors.affiliation: Centre des Matériaux des Mines d'Alès (C2MA) -Ecole des Mines d'Alès (Institut Mines Telecom), Avenue de Clavières 6, 30100 Alès cedex, France.
authors.forename: E
authors.initials: E
authors.lastname: Garcia-Diaz
mesh_terms: D007220:Industrial Waste / Q000032:analysis*; D008855:Microscopy, Electron, Scanning; D011791:Quartz / Q000737:chemistry*; D012995:Solubility; D013232:Steel / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D007220:Industrial Waste; D014867:Water; D013232:Steel; D011791:Quartz
keywords: EAF slag; Leaching behavior; Liquid-on-solid ratio; Quartz addition; Stabilization process