The flotation tailings of the former Pb-Zn mine of Touiref (NW Tunisia): mineralogy, mine drainage prediction, base-metal speciation assessment and geochemical modeling
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- 作者：Mohamed Ali Othmani ; Fouad Souissi…
- 关键词：Touiref mine ; Oxidized and unoxidized tailings ; Environmental geochemistry
- 刊名：Environmental Science and Pollution Research
- 出版年：2015
- 出版时间：February 2015
- 年：2015
- 卷：22
- 期：4
- 页码：2877-2890
- 全文大小：4,645 KB
- 参考文献：1. Adam K, Kourtis A, Gazea B, Kontopoulos A (1997) Evaluation of static tests used to predict the potential for acid drainage generation at sulfide mine sites. Trans Inst Min Metall Sect A: Min Industry 106:A1–A8
2. Alvarez E, Fernandez Marcos ML, Vaamonde C, Fernandez-Sanjurjo MJ (2003) Heavy metals in the dump of an abandoned mine in Galicia (NW Spain) and in the spontaneously occurring vegetation. Sci Total Environ 313(1-):185-97 CrossRef
3. Amacher MC, Brown RW, Sidle RC, Kotuby-Amacher J (1995) Effect of mine tailings on element speciation in headwater streams. In: A. Huang et B. Bowers (eds) Metal speciation and contamination of soils. Lewis, Boca Raton, FL p 275-09
4. Aubertin M, Bussière B, Chapuis RP (1996) Hydraulic conductivity of homogenized tailings from hard rock mines. Can Geotech J 33:470-82 CrossRef
5. Balistrieri LS, Murray JW (1982) The adsorption of Cu, Pb, Zn and Cd on geothite from seawater. Geochim Cosmochim Acta 46:1253-265 CrossRef
6. Banks D, Holden W, Aguilar E, Mendez C, Koller D (2002) Contaminant source characterization of the San Jose Mine, Oruro, Bolivia. In: L. Younger Paul et N.S. Robins (eds) Mine water hydrogeology and geochemistry. Geological Society of London, London, p 215-39
7. Benzaazoua M, Bussière B, Dagenais A-M, Archambault M (2004) Kinetic tests comparison and interpretation for prediction of the Joutel tailings acid generation potential. Environ Geol 46:1086-101 CrossRef
8. Bethum KJ, Lockington DA et Williams DJ (1997) Acid mine drainage: comparison of laboratory testing to mine site conditions. 4th ICARD, Vancouver, B.C. 1, 305-18
9. Blowes DW, Ptacek CJ, Jambor JL, Weisener CG (2003) The geochemistry of acid mine drainage. In: Lollar, B.S. (ed) Environmental geochemistry, treatise on geochemistry, vol. 9. Elsevier, New York, p 149-04
10. Bouzahzah H (2013) Modification et amélioration des tests statiques et cinétiques pour une prédiction fiable et sécuritaire du drainage minier acide. Thèse de doctorat, Université du Québec en Abitibi-Témiscamingue (UQAT)
11. Bouzahzah H, Califice A, Mermillod-blondin R, Benzaazoua M, Pirard E (2008) Modal analysis of mineralogical blends using optical image analysis versus x-ray diffraction and ICP. 9th International Congress for Applied Mineralogy (ICAM), Brisbane, pp 673-79
12. Bouzahzah H, Benzaazoua M, Bussière B, Plante B (2014) Prediction of acid mine drainage: importance of mineralogy and the test protocols for static and kinetic tests. Mine Water Environ 33:54-5. doi:10.1007/s10230-013-0249-1 CrossRef
13. Bowell RJ, Bruce I (1995) Geochemistry of iron ochres and mine waters from Levant Mine, Cornwall. Appl Geochem 10(2):237-50 CrossRef
14. Brunauer S, Emmett PH, Teller E (1938) Adsorption of gases in multimolecular layers. J Am Chem Soc 60:309-19 CrossRef
15. Bussière B (2007) Hydrogeotechnical properties of hard rock tailings from metal mines and emerging geoenvironmental disposal approaches. Can Geotechl J 44:1019-052 CrossRef
16. Carbone C, Dinelli CE, Marescotti P, Gasparotto G, L G G (2013) The role of AMD secondary minerals in controlling environmental pollution: Indications from bulk leaching tests. J Geochem Explor 132:188-00 CrossRef
17. Cardoso Fonseca E, Ferreira da Silva E (1998) Application of selective extraction techniques in metal-bearing phases identification: a South European case study. J Geochem Explor 61(1-):203-12 CrossRef
18. Cardoso Fonseca E, Martin H (1986) The selective extraction of Pb and Zn in selected minerals and soil samples, application in geochemical exploration—Portugal. J Geochem Explor 26:231-48
文摘
The underground extraction of Pb-Zn mineralization in the Touiref area stopped in 1958. A large volume of flotation tailings (more than 500?Mt) containing sulfides were deposited in a tailings impoundment. The goals of this study are to evaluate the neutralization capacity of the unoxidized and oxidized tailings, to assess the speciation of metals between the different components of the tailings material, and to assess the mobility of metals and the secondary minerals-precipitation in pore waters using geochemical modeling. To accomplish these objectives, representative samples from both fresh and oxidized zones were collected along a vertical profile through the tailings pile. Physical, chemical (ICP-MS), and mineralogical characterization (X-ray diffraction (XRD), reflected light microscopy, scanning electron microscope (SEM)) of these samples was performed. Grain size analysis shows that the tailings are dominated by silt- to sand-sized fractions. The microscopic observation highlights the presence of pyrite, marcasite, galena, and sphalerite as primary minerals in a carbonated matrix. The study reveals also the presence of secondary minerals represented by cerussite, smithsonite, anglesite, and Fe oxi-hydroxides as important scavengers for trace elements. The static tests show that the presence of calcite in the tailing samples ensures acid-neutralizing capacity (ANC), which is significantly greater than the acidity potential (PA). The geochemical characterization of the unoxidized samples shows higher Cd, Pb, and Zn concentrations than the oxidized samples containing the highest values for Fe and SO4. Sequential extraction tests show that significant percentages of metals are distributed between the acid-soluble fractions (Cd, Pb, and Zn) and the reducible one (Zn). Pore water analysis indicates that Ca is the dominant cation (8,170 and 6,200?mg?L?, respectively), whereas sulfate is the principal anion (6,900 and 5,100?mg?L?, respectively). Saturation index (SI) calculations of minerals in pore water extracted from both the oxidized and unoxidized samples are indicative of gypsum (SI >0) and Fe(III) oxides (SI ?) precipitation. The latter controls the Fe concentration in solution.