Environmental mineralogy and geochemistry of Pb–Zn mine wastes, Northern Tunisia
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- 作者：Haifa Tlil ; Radhia Souissi ; Fouad Souissi ; Pierfranco Lattanzi…
- 关键词：Mine tailings ; Neutral reaction ; Leaching tests ; PTE ; Northern Tunisia
- 刊名：Rendiconti Lincei
- 出版年：2017
- 出版时间：March 2017
- 年：2017
- 卷：28
- 期：1
- 页码：133-141
- 全文大小：
- 刊物类别：Earth and Environmental Science
- 刊物主题：Environment, general; Earth Sciences, general; Life Sciences, general; Biomedicine, general; History of Science;
- 出版者：Springer International Publishing
- ISSN：1720-0776
- 卷排序：28
文摘
Fine-grained waste materials in the former Pb–Zn mining district of Northern Tunisia contain environmentally significant amounts of potentially toxic elements (PTE), such as Zn (6.9–13.7 g kg−1), Pb (2.9–9.6 g kg−1), Cd (31–106 mg kg−1), As (180–837 mg kg−1), and Sb (1–102 mg kg−1). Mineralogical studies identified as PTE carriers’ primary sulfides (galena, sphalerite, pyrite, chalcopyrite, and arsenopyrite) and sulfosalts (jordanite), and secondary oxidized minerals (cerussite and smithsonite), accompanied by sulfates (gypsum and barite), calcite, and minor clay minerals. Leaching tests with deionized water indicate a near-neutral reaction, accompanied by a comparatively high release of PTE (As 16–58.5 µg L−1 and Sb 1.5–60 µg L−1), (Pb 222–1130 µg L−1, Zn 4865–15,665 µg L−1, and Cd 4–25 µg L−1), and sulfate (3690–22,070 mg L−1). These values are well above the recommended WHO limits for drinking waters. Therefore, these wastes represent a potential threat for the environment, and should be adequately monitored/ reclaimed.