title: Mineralogy and metals speciation in Mo rich mineral sludges generated at a metal recycling plant.
abstract: In France, more than 250 million metric tons of sludges need to be treated each year. These sludges are either dumped on the landfills or reused as secondary resources in order to preserve natural resources. A large portions of these sludges are mineral sludges, originating from metal recycling plants. In order to estimate their metal recovery potential, these mineral sludges were characterized. Four types of mineral sludge samples were collected from a metal recycling plant (3 from the recycling plant storage areas (bulk storage, barrel storage and storage shed) and 1 from the collection basin). The sludges were characterized, wherein the Mo, Ni, Cr, Co, Zn and W content and speciation were quantified. The samples had pH values between 5.9 and 10.3 with organic matter contents varying between 6.3% (storage shed) and 29.5% (bulk storage) (loss on ignition at 500 °C). Based on their leaching properties, the four mineral sludge samples (in the case of Mo) and the bulk storage sludge (in the case of Ni and Zn) were classified as potentially hazardous regarding the EN 12457-1 and EN 12457-2 method. Mineralogical results reveal that both bulk storage and the storage shed give the highest contributions to the metal content of the collection basin sample. Sequential extraction of the collection basin samples indicated that Mo is bound to the oxidizable and residual fraction, while Ni, Cr and Co were bound to the residual fraction, and Zn to the soluble acid fraction, respectively. W tends to be equally distributed among all extracted fractions. A strong correlation existed between Mo and Co, as well as between Ni, Zn and Cr, respectively.
authors.affiliation: Université de Limoges, Groupement de Recherche Eau-Sol-Environnement (GRESE), Faculté des Sciences & Techniques, 123 avenue Albert Thomas, 87 060 Limoges, France; Université Paris-Est, Laboratoire Géomatériaux et Environnement (LGE), EA 4508, UPEM, 77454 Marne-la-Vallée, France; UNESCO-IHE Institute for Water Education, Westvest 7, 2611 AX Delft, The Netherlands.
authors.forename: M
authors.initials: M
authors.lastname: Vemic
authors.affiliation: Université de Limoges, Groupement de Recherche Eau-Sol-Environnement (GRESE), Faculté des Sciences & Techniques, 123 avenue Albert Thomas, 87 060 Limoges, France. Electronic address: Francois.Bordas@unilim.fr.
authors.forename: F
authors.initials: F
authors.lastname: Bordas
authors.affiliation: Université de Limoges, Groupement de Recherche Eau-Sol-Environnement (GRESE), Faculté des Sciences & Techniques, 123 avenue Albert Thomas, 87 060 Limoges, France.
authors.forename: G
authors.initials: G
authors.lastname: Guibaud
authors.affiliation: Université de Limoges, Groupement de Recherche Eau-Sol-Environnement (GRESE), Faculté des Sciences & Techniques, 123 avenue Albert Thomas, 87 060 Limoges, France.
authors.forename: E
authors.initials: E
authors.lastname: Joussein
authors.affiliation: Université de Poitiers, UMR CNRS 7285, Institut de Chimie des Milieux et des Matériaux de Poitiers, ENSIP, 1 Rue Marcel Doré, 86 222 Poitiers, France.
authors.forename: J
authors.initials: J
authors.lastname: Labanowski
authors.affiliation: UNESCO-IHE Institute for Water Education, Westvest 7, 2611 AX Delft, The Netherlands.
authors.forename: P N L
authors.initials: PN
authors.lastname: Lens
authors.affiliation: Université Paris-Est, Laboratoire Géomatériaux et Environnement (LGE), EA 4508, UPEM, 77454 Marne-la-Vallée, France.
authors.forename: E D
authors.initials: ED
authors.lastname: van Hullebusch
mesh_terms: D019216:Metals, Heavy / Q000032:analysis*; D008982:Molybdenum / Q000032:analysis; D059027:Recycling; D012722:Sewage / Q000032:analysis*; D018505:Waste Management
chemical_list: D019216:Metals, Heavy; D012722:Sewage; D008982:Molybdenum
keywords: Characterization; Industrial mineral sludge; Leaching characteristics; Metals; TCLP