Prediction of the long-term performance of green liquor dregs as a sealing layer to prevent the formation of acid mine drainage
Prediction of the long-term performance of green liquor dregs as a sealing layer to prevent the formation of acid mine drainage
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绿液渣作为密封层防止酸性矿山排水形成的长期性能预测
DOI：
10.1016/j.jece.2015.10.005
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发表时间：
2016
影响因子：
7.7
通讯作者：
B. Öhlander
中科院分区：
文献类型：
--
作者：
Maria Mäkitalo;Jinmei Lu;C. Maurice;B. Öhlander
采矿业的主要关注点之一是硫化矿提取过程中产生的废石和尾矿的管理。暴露于大气中的氧气后，硫化铁会氧化产生酸性。渗透水形成富含金属的酸性渗滤液，称为酸性矿山排水（AMD），会导致严重的环境问题。绿液渣 (GLD) 是一种阻止氧气和水通过的材料，因此可用于密封矿山废物，防止其氧化和 AMD 形成。为了使其能够在干燥的矿山废物覆盖层中使用，必须评估此类 GLD 密封层的长期效率。在这项研究中，从两个地点收集了新鲜 GLD 和陈化 3-13 年的 GLD 并进行分析，以确定老化如何影响其化学和物理特性。老化的 GLD 和新鲜的 GLD 在密封层的所有重要特性方面非常相似。特别是，在老化的 GLD 样品中没有方解石溶解的证据。老化的 GLD 还表现出高水饱和度 (>91%) 和化学稳定性，这两者对于有效的长期密封都很重要。现场部署的 GLD 的剪切强度随着时间的推移而增加，但不足以确保纯 GLD 密封层的长期物理完整性。因此，有必要开发具有更高剪切强度的混合材料。
One of the mining industry’s main concerns is the management of waste rock and tailings generated by sulfide ore extraction. Upon exposure of atmospheric oxygen, iron sulfides oxidize generating acidity. Infiltrating water form a metal-rich acidic leachate called acid mine drainage (AMD), that can cause serious environmental problems. Green liquor dregs (GLD) is a material that resists the passage of oxygen and water and could thus be used to seal mine wastes, preventing their oxidation and AMD formation. To enable its use in dry mine waste covers, the long-term efficiency of such GLD sealing layers must be evaluated. In this study, fresh GLD and GLD aged for 3–13 years was collected from two sites and analysed to determine how aging affects its chemical and physical properties. Aged and fresh GLD were very similar with respect to all the properties important in a sealing layer. In particular, there was no evidence of calcite dissolution in aged GLD samples. Aged GLD also exhibited high water saturation (>91%) and chemical stability, both of which are important for effective long-term sealing. The shear strength of GLD deployed in the field increased over time but not sufficiently to ensure the long-term physical integrity of a pure GLD sealing layer. The development of hybrid materials with improved shear strength will therefore be necessary.
影响因子：
2.6
作者：
DAVIS, JL;ANNAN, AP
通讯作者：
ANNAN, AP