School of Earth Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China; Center for Applied Geosciences (ZAG), Eberhard Karls Universität Tübingen, Hölderlinstr. 12, D-72074 Tübingen, Germany; Guangdong Provincial Key Laboratory of Geological Processes and Mineral Resource Exploration, Guangzhou 510275, China.
School of Earth Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China; Guangdong Provincial Key Laboratory of Geological Processes and Mineral Resource Exploration, Guangzhou 510275, China.
Ecotoxicol Environ Saf. 2018 Jul 15;155:50-58. doi: 10.1016/j.ecoenv.2018.02.017. Epub 2018 Mar 2.
This article documents the new precipitates formed related to acid mine drainage (AMD) at Dabaoshan mine (South China). X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscope & Energy Spectrometer (SEM-EDS) have been used to detect minerals in AMD impoundment and downstream creeks. The occurrences, the mineralogical species and the micro-morphological characteristics of secondary minerals from different pH conditions has been carried out. Iron- hydroxysulfates and iron-oxyhydroxides are the main secondary minerals, and they occurred as both poorly and well-crystalline minerals. Jarosite nearly predominate as pseudocubic crystals at pH 2.5-4.0. Schwertmannite-rich sediments occurred at pH 3.82-4.5 as urchin-like, pin-cushion and as well as globular-like aggregates and show high concentrations of Mn, Cu, Pb and As due to adsorption and co-precipitation. Goethite formed mainly as botryoidal and flaky assemblages. Paragenesis of different types of schwertmannite indicate that pH condition is not the dominant factor controlling morphology but the main parameter for the variation of minerals species. Statistical analysis reveal obvious changing tendency in Zn, Cd and SO within pH. FTIR analysis show adsorption of Cu, Pb, Zn and As on secondary iron minerals. Water elements with high concentrations in the impoundment and the obvious decrease in downstream creak reflected an accumulation and evaporation in AMD impoundment and a dilution in downstream area respectively. These results indicate that secondary minerals associated with AMD can play an important role in attenuating toxic elements.
本文记录了中国南方大宝山矿酸性矿山排水（AMD）相关的新沉淀物。采用 X 射线衍射（XRD）、傅里叶变换红外光谱（FTIR）和扫描电子显微镜与能谱仪（SEM-EDS）检测了 AMD 蓄水池和下游溪流中的矿物。研究了不同 pH 值条件下次生矿物的存在、矿物种类和微观形貌特征。铁的氢氧化物和铁的氢氧化物是主要的次生矿物，它们以结晶度差和结晶度好的矿物形式存在。在 pH 2.5-4.0 时，水铁矾几乎以假立方晶体为主。在 pH 3.82-4.5 时，水钠锰矿富沉积物呈海胆状、针垫状以及球状聚集，并由于吸附和共沉淀而表现出高浓度的 Mn、Cu、Pb 和 As。针铁矿主要形成葡萄状和片状组合。不同类型水钠锰矿的共生表明，pH 值条件不是控制形态的主要因素，而是矿物种类变化的主要参数。统计分析显示 pH 值内 Zn、Cd 和 SO 有明显的变化趋势。FTIR 分析表明 Cu、Pb、Zn 和 As 吸附在次生铁矿物上。蓄水池中高浓度的水元素和下游溪流中明显减少反映了 AMD 蓄水池中的积累和蒸发以及下游区域的稀释。这些结果表明，与 AMD 相关的次生矿物可以在减轻有毒元素方面发挥重要作用。
