不同粒径钨尾砂中重金属的含量及形态研究

发布时间：2019-04-10 20:27

【摘要】：以江西省赣南地区牛孜石、画眉坳、西华山钨矿尾砂库为研究对象,采集钨尾砂样品3份,使用标准筛将其细分为7个粒径等级(25μm、25~50μm、50~75μm、75~150μm、150~300μm、300~450μm、450μm)。以BCR连续提取法对重金属进行形态提取,ICP-OES测定不同粒径钨尾砂颗粒物中Cr、Mn、Cu、Zn、Cd、As、Pb、Ni重金属各形态的含量。研究结果表明:不同粒径的尾砂中重金属的含量差异明显,Cu、Zn元素在粒径380μm的颗粒物中含量较高,Cr、Cd、Pb、Ni、Mn元素则在粒径25μm的颗粒物中有着很高的含量,特别是Pb,该粒径中的含量远高于其他任何粒径区间。重金属形态随尾砂粒径分布表明:不同矿区同一粒径的尾砂各形态重金属所占比例差异明显,但相同的是,粒径大于450μm的颗粒物中Cu、Zn可交换态形式所占比例较高,而粒径小于25μm的极细颗粒物中,可溶态的Ni含量很高,需要采取有效管理措施以遏制可能发生的污染。
[Abstract]:Three samples of tungsten tailings were collected and divided into seven particle sizes (25 渭 m, 25 ~ 50 渭 m, 50 ~ 75 渭 m, 75 ~ 150 渭 m, 150 ~ 300 渭 m, 300 ~ 450 渭 m, 450 渭 m). The speciation of heavy metals was extracted by BCR continuous extraction method, and the contents of Cr,Mn,Cu,Zn,Cd,As,Pb,Ni heavy metals in tungsten tailing particles with different particle sizes were determined by ICP-OES. The results showed that the contents of heavy metals in tailings with different particle sizes were obviously different. The content of Cu,Zn element was higher in the particle size of 380 渭 m, and the content of Cr,Cd,Pb,Ni,Mn element was very high in the particle size of 25 渭 m, while the content of heavy metal in the tailings of different particle size was higher than that in the particle size of 380 渭 m. In particular, the content of Pb, in the particle size is much higher than that in any other particle size range. The distribution of heavy metal species with tailing particle size shows that the proportion of heavy metals in tailings with the same particle size is obviously different in different mining areas, but the same is that the proportion of exchangeable forms of Cu,Zn in particles with particle size greater than 450 渭 m is higher. However, the content of soluble Ni in very fine particles with particle size less than 25 渭 m is very high, so it is necessary to take effective management measures to control the possible pollution.
【作者单位】：南昌大学资源环境与化工学院;
【基金】：国家自然科学基金(41173115) 南昌大学研究生创新专项资金资助(cx2015215)
【分类号】：X751

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