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首页> 外文期刊>Journal of Geochemical Exploration: Journal of the Association of Exploration Geochemists >Layers Rich in Fe- and Mn-Oxyhydroxides Formed at the Tailings-Pond Water Interface, a Possible Trap for Trace Metals in Flooded Mine Tailings
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Layers Rich in Fe- and Mn-Oxyhydroxides Formed at the Tailings-Pond Water Interface, a Possible Trap for Trace Metals in Flooded Mine Tailings

机译：尾矿-池塘水界面处形成的富含铁和锰羟基氧化物的层，这可能是淹没矿山尾矿中微量金属的陷阱

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摘要

Geochemical field studies of the flooded sulphide-rich mine tailings at Stekenjokk in northern Sweden have been performed. Minor diffusion of elements from the tailings to the pond water is occurring. The diffusion rate is higher where tailings that were oxidised before the flooding have been deposited. Layers rich in Fe- and Mn-oxyhydroxides have been developed close to the tailings surface, and a layer of natural sedimens rich in organic material have developed on the talings surface since the flooding. The oxyhydroxides adsorb and/or co-precipitare metals and function as a trap for released metals at the tailings-pond water interface, thereby decreasing the diffusion rate from the tailings pore water to the pond water at the sediment-water interface. This study shows that it is possible for a deposit of flooded tailings to reach a state when it almost functions as a natural lake in northerly areas, with Fe-and Mn-oxyhydroxide layers controlling the diffusion of metals into the overlying pond water, within a relatively short time after remediation.
机译：在瑞典北部的Stekenjokk，对充满硫化物的富矿尾矿进行了地球化学实地研究。元素从尾矿到池塘水中的扩散很小。在溢流之前已被氧化的尾矿已经沉积的情况下，扩散速率更高。自驱油以来，已在尾矿表面附近形成了富含Fe-和Mn-羟基氢氧化物的层，并且在滑石表面上形成了富含有机材料的天然sedimens层。羟基氧化物吸收和/或共沉淀金属，并在尾矿池-水界面处充当释放金属的捕集剂，从而降低了从尾矿孔水到沉积物-水界面处的池塘水中的扩散速率。这项研究表明，在北部地区几乎充当天然湖泊时，淹没的尾矿沉积物可能会达到某种状态，其中Fe和Mn-羟基氧化层控制着金属向上方池塘水中的扩散。修复后的时间相对较短。

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