期刊
MINE WATER AND THE ENVIRONMENT
卷 32, 期 1, 页码 28-41出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s10230-012-0210-8
关键词
Contaminated neutral drainage (CND); Flotation tailings; Metal release; Water contamination
资金
- Tunisian Ministry of High Education and Scientific Research
- URSTM of the University of Quebec
- Rouyn-Noranda, Canada
Flotation tailings associated with the extraction of Pb and Zn in the Touiref mining district, Tunisia, contain galena, sphalerite, pyrite, and marcasite in a carbonate gangue. The geochemical behaviour of oxidized and unoxidised tailings were consistent with their mineralogical and chemical characteristics. The leaching proceeded under neutral to slightly alkaline condition (pH 7.3-8.5), and positive Eh (250-470 mV). The concentrations of sulfate and Ca released during the leaching tests were associated with the neutralization of acidity by carbonates and the dissolution of gypsum initially present in the tailings. The iron precipitated, but significant amounts of Zn (5-3,300 mu g/L), Cd (3-18 mu g/L), and Pb (28-83 mu g/L) were released during leaching, with the latter two exceeding international environmental norms (5 mu g/L for Cd and 10 mu g/L for Pb).
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