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Mineralogical and Geochemical Characterization of Mine Tailings and Pb, Zn, and Cd Mobility in a Carbonate Setting (Northern Tunisia)

Mine water and the environment, 2013-03, Vol.32 (1), p.16-27 [Peer Reviewed Journal]

Springer-Verlag Berlin Heidelberg 2012 ;Springer-Verlag Berlin Heidelberg 2012. ;ISSN: 1025-9112 ;EISSN: 1616-1068 ;DOI: 10.1007/s10230-012-0208-2

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Title:
Mineralogical and Geochemical Characterization of Mine Tailings and Pb, Zn, and Cd Mobility in a Carbonate Setting (Northern Tunisia)
Author: Souissi, Radhia ; Souissi, Fouad ; Chakroun, Hédi Karim ; Bouchardon, Jean Luc
Subjects: Acid mine drainage ; Acidity ; Base metal ; Cadmium ; Calcium ; Calcium sulfate ; Carbonates ; Contaminants ; Contaminated sediments ; Earth and Environmental Science ; Earth Sciences ; Ecotoxicology ; Flotation ; Freshwater ; Geochemistry ; Geology ; Gypsum ; Heavy metals ; Hydrogeology ; Industrial Pollution Prevention ; Iron sulfides ; Iron sulphides ; Lead ; Mine drainage ; Mine tailings ; Mine wastes ; Mineral Resources ; Mineralogy ; Mobility ; Neutralization ; Oxidation ; Permeability ; pH effects ; Porosity ; Pyrite ; River water ; Rivers ; Sulfides ; Sulphides ; Surface water ; Tailings ; Techinical Article ; Water pollution ; Water Quality/Water Pollution ; Zinc
Is Part Of: Mine water and the environment, 2013-03, Vol.32 (1), p.16-27
Description: Millions of tonnes of Pb–Zn ore flotation tailings and waste rock have been discharged at sites in northern Tunisia without concern for environmental issues. The tailings are dominantly fine grained (<125 μm), with high porosity and permeability. The tailings were characterized to assess base metal (Pb, Zn, and Cd) mobility. The relatively low percentage of iron sulphide and the dominance of carbonates in the matrices of the tailings indicated that only neutral mine drainage is likely. Batch sequential testing showed that the calcium and sulphate, which are the major ionic species in solution, are derived mainly from the dissolution of gypsum and not from neutralization of acidity generated by pyrite oxidation. Yet, despite the carbonate setting, the resultant neutral to slightly alkaline pH, and prolonged weathering, the studied flotation tailings maintain their capacity to release contaminants, notably Zn and Cd, into the environment. The amount of Zn that dissolves (2,400 μg L −1 , on average), though significant, is below the background concentrations in the Mejerda River and the environmental norms established for surface waters. Pb concentrations come close to the standards, but only Cd (18 μg L −1 , on average) sometimes exceeds current river water concentrations and environmental standards.
Publisher: Berlin/Heidelberg: Springer-Verlag
Language: English
Identifier: ISSN: 1025-9112
EISSN: 1616-1068
DOI: 10.1007/s10230-012-0208-2
Source: AUTh Library subscriptions: ProQuest Central
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Mineralogical and Geochemical Characterization of Mine Tailings and Pb, Zn, and Cd Mobility in a Carbonate Setting (Northern Tunisia)

Springer-Verlag Berlin Heidelberg 2012 ;Springer-Verlag Berlin Heidelberg 2012. ;ISSN: 1025-9112 ;EISSN: 1616-1068 ;DOI: 10.1007/s10230-012-0208-2

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