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卡林型金矿区环境地球化学特征、污染机制与绿色治理研究

Environmental geochemical characteristics, pollution mechanisms, and green remediation of Carlin-type gold mine areas

  • 摘要: 卡林型金矿是全球黄金资源的重要来源,主要分布于美国内华达州和中国滇黔桂地区。该类金矿床普遍富集砷(As)、锑(Sb)、汞(Hg)及铊(Tl)等有害元素。卡林型金矿区特征污染物的来源为载金硫化矿物表生氧化溶解,其环境地球化学行为涵盖氧化还原、吸附−共沉淀、解吸−溶解等关键过程,其中次生铁矿物的相转变是驱动As等元素二次释放与持续污染的关键机制。围绕卡林型金矿区的污染修复,已逐步形成以资源化利用为导向,结合源头管控—生态缓冲—末端净化的全过程协同绿色治理技术体系。源头管控通过尾矿固化、表面钝化、水覆盖及微生物调控等手段,有效抑制硫化矿物氧化及重金属释放;生态缓冲主要依托耐性植物修复、土壤重构及微生物强化作用,削减污染迁移并提升生态承载力;末端净化结合人工湿地、生物反应池及多级被动处理系统,实现矿区废水中重金属、氰化物及硫酸盐等污染物的达标排放。系统阐述了卡林型金矿区的环境地球化学特征、污染物释放迁移转化机制与污染治理技术研究进展,对比了中国与美国典型卡林型金矿区的污染分异规律与成因,展望了该领域未来的研究重点,以期为全球卡林型金矿区的污染防控与绿色可持续发展提供科学依据与技术参考。

     

    Abstract: Carlin-type gold deposits are a globally important source of gold, predominantly located in Nevada, USA, and the Yunnan−Guizhou−Guangxi region of China. These deposits are typically enriched in hazardous elements such as arsenic (As), antimony (Sb), mercury (Hg), and thallium (Tl). The characteristic pollutants in the Carlin-type gold mine areas originate from the supergene oxidative dissolution of gold-bearing sulfide minerals. Their environmental geochemical behavior encompasses key processes including redox reactions, adsorption-coprecipitation, and desorption-dissolution, among which the phase transformation of secondary iron minerals constitutes a critical mechanism driving the secondary release and persistent contamination of elements such as As. At present, a synergistic green remediation technology system has been gradually established for Carlin-type gold mine areas, centered on a whole-process strategy of "source control, ecological buffering, and end-of-pipe purification". Source control inhibits sulfide mineral oxidation and heavy metal release through measures including tailings solidification, surface passivation, water covers, and microbial regulation. Ecological buffering relies primarily on tolerant plant remediation, soil reconstruction, and microbial enhancement to mitigate pollutant migration and improve ecological carrying capacity. End-of-pipe purification integrates constructed wetlands, bioreactors, and multi-stage passive treatment systems to achieve compliant discharge of heavy metals, cyanide, and sulfate from mining wastewater. This review systematically summarized the environmental geochemical characteristics, pollutant release, migration and transformation mechanisms, and advances in remediation technologies for Carlin-type gold mine areas. It compared the pollution differentiation patterns and their causes in typical Carlin-type gold mine areas of China and the USA and outlined future research priorities, aiming to provide a scientific basis and technical reference for pollution prevention and green sustainable development in Carlin-type gold mine areas worldwide.

     

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