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投稿时间:2013-10-05 修订日期:2013-10-10
投稿时间:2013-10-05 修订日期:2013-10-10
中文摘要: 排放到环境中的重金属镉,它的污染与危害决定于它在环境中的含量分布、化学特征、环境地球化学行为及迁移转化。本文着重阐述了重金属镉在硫化物尾矿中的赋存状态及迁移富集机制,得知硫化物尾矿的氧化作用释放一定的金属离子、SO42-和H ,是镉元素向环境迁移和扩散主要原因。在强氧化条件下,镉主要呈可迁移和可交换的离子态,而且极易溶解于水,会给环境带来极大的污染威胁。针对镉的地球化学特征及污染机理,可知阻止硫化物氧化及加入碱性材料,可从源头上预防和控制酸水及重金属的排放;可采用固液分离、铁氧体、生物修复以及在尾矿污染羽的下缘修建渗透反应栅等方法,将镉污染物拦截清理,从而使其可以安全排放,保护矿山环境。
Abstract:The heavy metal cadmium that emissions to the environment, it's pollution is determined by it's concentration distribution, chemical characteristics, environmental geochemical behaviors and migration and transformation in the environment. This article focuses on Cadmium’s occurrence in sulfide tailing and its migration and enrichment mechanism. We learn that the oxidation of sulfide release the metal ions、SO42- and H , which become the main reason of the cadmium elements move and spread to the environment. When under the condition of strong oxidation, the main ionic state of cadmium can be transferable and exchangeable, they can easily soluble in water and bring great pollution threat to the environment. Based on the geochemical characteristics and pollution mechanism of cadmium, we know that preventing oxidation of sulfide and adding alkaline materials can prevent and control the release of the acid water and heavy metal from the source; we can use the methods such as solid-liquid separation process、ferrite method、biological repair method and building permeable reactive barriers on the lower edge of the tailings pollution plume. So we can intercept and clean up the cadmium pollution , make it can be safely discharged and protect mine envirionment.
keywords: Sulphide tailings, Chemical form, Migration and enrichment, Pollution prevention and treatment, Cadmium pollution
文章编号: 中图分类号: 文献标志码:
基金项目:国家自然科学基金面上项目
作者 | 单位 | |
莫斌吉 | 桂林理工大学 地球科学学院 | 656665845@qq.com |
雷良奇* | 桂林理工大学 地球科学学院 | leilq@glut.edu.cn |
黄祥林 | 1,桂林理工大学 2,广西壮族自治区区域地质调查研究院 | |
赵蛟彬 | 桂林理工大学 地球科学学院 | |
徐沛斌 | 桂林理工大学 地球科学学院 |
引用文本:
莫斌吉,雷良奇,黄祥林,赵蛟彬,徐沛斌.镉在硫化物尾矿中的地球化学行为及其污染防治[J].有色金属(矿山部分),2014,66(2):.
Mo Binji,Lei Liangqi,Huang Xianglin,Zhao Jiaobin,Xu Peibin.Cadmium’s geochemical behavior in sulphide tailings and it’s pollution prevention[J].NONFERROUS METALS(Mining Section),2014,66(2):.
莫斌吉,雷良奇,黄祥林,赵蛟彬,徐沛斌.镉在硫化物尾矿中的地球化学行为及其污染防治[J].有色金属(矿山部分),2014,66(2):.
Mo Binji,Lei Liangqi,Huang Xianglin,Zhao Jiaobin,Xu Peibin.Cadmium’s geochemical behavior in sulphide tailings and it’s pollution prevention[J].NONFERROUS METALS(Mining Section),2014,66(2):.