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首页> 外文期刊>Chinese science bulletin >Highly Zn, Mn-rich calcite in calcareous tufa from the Qixiashan Pb-Zn Mine, Nanjing: a possible candidate for Zn-Mn removal from mining impacted waters
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Highly Zn, Mn-rich calcite in calcareous tufa from the Qixiashan Pb-Zn Mine, Nanjing: a possible candidate for Zn-Mn removal from mining impacted waters

机译：南京栖霞山铅锌矿石灰钙矿中富含锌，锰的方解石：从受影响矿山中去除锌锰的可能候选物

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摘要

The exploitation of metallic mines may cause serious environmental problems. The removal of the heavy metals from the contaminated mining environments has become an urgent issue. In this paper, the occurrence and distribution of heavy metals in the calcareous tufa collected from the mining laneway of the Qixiashan Pb-Zn Mine in Nanjing were investigated by using multiple mineralogical techniques. Examination by X-ray diffraction spectrum (XRD) shows that calcite is the major component of the calcareous tufa. Several heavy metals such as Mn, Zn, Mg, Fe and Pb are detected in calcite by means of electron microprobe analysis. Although the heavy metal contents in the hostrock and the formation water are significantly low, the contents of Mn, Zn, Mg, Fe and Pb in the tufa calcite are as high as 23.65 wt%, 9.6 wt%, 0.76 wt%, 4.44 wt% and 0.66 wt%, respectively. The back-scattered electron image shows complex compositional zoning texture in the tufa, which is linked directly to variations in heavy metals, particularly in Mn and Zn. In addition, we also observed floccule and helical precipitations, which may be derived from the metabolism of the microbe. It is deduced that the occurrence and high concentration of heavy metals in tufa may be controlled by the activities of microbes. The results presented in this work suggest that calcite will be an important candidate for the remediation of the heavy metal contamination in mining areas.
机译：金属矿的开采可能会导致严重的环境问题。从受污染的采矿环境中去除重金属已成为当务之急。本文采用多种矿物学方法研究了南京栖霞山铅锌矿采煤巷道钙质石灰石中重金属的赋存规律。通过X射线衍射光谱（XRD）进行的检查表明，方解石是钙质石灰石的主要成分。通过电子探针分析可在方解石中检测到几种重金属，例如Mn，Zn，Mg，Fe和Pb。尽管基岩和地层水中的重金属含量非常低，但方解石中的Mn，Zn，Mg，Fe和Pb含量高达23.65 wt％，9.6 wt％，0.76 wt％，4.44 wt ％和0.66wt％。背向散射电子图像显示了石灰粉中复杂的成分分区纹理，这直接与重金属（尤其是Mn和Zn）的变化有关。此外，我们还观察到了絮状和螺旋状沉淀，这可能是由于微生物的代谢所致。可以推断，微生物中的活性可以控制石灰中重金属的发生和高浓度。这项工作提出的结果表明，方解石将是补救矿区重金属污染的重要候选人。

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