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首页> 外文会议>International Conference on Acid Rock Drainage >Effluent Chemistry of Closed Sulfide Mine Tailings: Influence of Ore Type
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Effluent Chemistry of Closed Sulfide Mine Tailings: Influence of Ore Type

机译：闭合硫化物矿尾矿流出物化学：矿床的影响

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The seepage water quality of old sulfide mine tailings was studied from eleven closed sulfide metal mines in Finland to assess the influence of ore type on the drainage quality of tailings in the long-term. The studied sites represent a wide variety of ore types and commodities (e.g. Mo; Cu and Zn; Ni and Cu; Cu, W, As, Ag; Fe). Also the operation periods of the mines vary, from the 1750s to 1990s. Mining operations had ceased at the sites some 15-62 years ago (prior to sampling), but most of the facilities were left without any cover after mine closure. Only three of the tailings impoundments were covered with a thin layer of till or peat.The seepage quality varied largely between the different mine sites. The pH of the seepages was between 2.8-7.3 and the total metal content (Zn + Cu + Cd + Pb + Co + Ni) between 0.004-207 mg/L. Overall, the high-acid, high-metal waters were related to Cu mine tailings, whereas the seepages from the other tailings deposits (i.e. from Ni, Fe, Mo, and Zn mines) were mostly near-neutral, low-metal containing waters. Unexpectedly, the most acidic seepage waters were found at the two sites where the tailings were covered with till after closure. One of the sites represented tailings from a Cu mine and the other from a Ni mine.The results of the study show that there is a correlation between the tailings effluent quality and the ore type. However, other factors such as weathering period of the tailings also influence the seepage quality. These types of data contribute to the prediction of the long-term drainage quality of the new mining sites and in defining the requirements for their waste management and water treatment.
机译：芬兰的11封闭硫化物金属矿山研究了旧硫化物矿尾矿的渗水水质，以评估矿石类型在长期尾矿排水质量的影响。研究的网站代表各种矿石类型和商品（例如，Mo; Cu和Zn; Ni和Cu; Cu，W，As，Ag; Fe）。此外，矿山的运营期各不相同，从1750年代到1990年代。采矿业务已经在大约15-62年前（在抽样之前）停止，但在矿井关闭后，大多数设施都没有任何封面。只有三个尾矿蓄积量被薄薄的耕作或泥炭覆盖。渗流质量在不同的矿场之间的不同程度变化。渗透的pH在2.8-7.3之间，总金属含量（Zn + Cu + Cd + Pb + Co + Co + Ni）在0.004-207mg / L之间。总体而言，高酸，高金水水与Cu矿尾矿有关，而来自其他尾矿沉积物（即来自Ni，Fe，Mo和Zn矿山）的渗透大部分近乎中性，低金属含水水。出乎意料地，最酸性的渗水水域在尾矿覆盖后的两个地点发现。其中一个位点代表了来自铜矿的尾矿，另一个位于镍矿。研究结果表明尾矿流出物质和矿石类型之间存在相关性。然而，其他因素如尾矿的风化周期也会影响渗漏质量。这些类型的数据有助于预测新型采矿网站的长期排水质量，以及定义其废物管理和水处理的要求。

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