Alteration of a Mn-rich slag in contact with soil: in-situ experiment during one year.
A Mn-rich slag sample coming from a pyrometallurgical plant recycling alkaline batteries was submitted to environmental conditions during one year. After crushing, the slag was buried in topsoil and the leachate was periodically collected in order to monitor the leached amounts of metallic elements (ME). Results evidenced a low release of the slag constituents (Mn: < 0.01%). The SEM/EDS investigations did not show alteration features supposing a weak dissolution of the primary phases (tephroite, bustamite and leucite). The modification of the pH induced by the slag enhanced the mobility of soil components and of the organic matter, particularly in the vicinity of the soil/slag contact zone. This suggested that the slag indirectly influenced the ME mobility through the organic matter and colloidal transports. The comparison with a classical laboratory column test evidenced the underestimation of the leached amounts due to the differences of operational conditions.
Pareuil
Priscilla
P
Université de Limoges, Groupement de Recherche Eau - Sol - Environnement (GRESE), Faculté des Sciences & Techniques, 123 avenue Albert Thomas, 87 060 Limoges, France.
Bordas
François
F
Joussein
Emmanuel
E
Bollinger
Jean-Claude
JC
D003247:Conservation of Natural Resources; D004784:Environmental Monitoring; D008345:Manganese / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D014872:Water Movements
D012989:Soil Pollutants; D008345:Manganese