Characterization of Green Liquor Dregs, Potentially Useful for Prevention of the Formation of Acid Rock Drainage
Characterization of Green Liquor Dregs, Potentially Useful for Prevention of the Formation of Acid Rock Drainage
复制标题
绿液渣的表征，可能有助于防止酸性岩排水的形成
DOI：
10.3390/min4020330
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发表时间：
2014
期刊：
影响因子：
2.5
通讯作者：
B. Öhlander
中科院分区：
文献类型：
--
作者：
Maria Mäkitalo;C. Maurice;Yu Jia;B. Öhlander
使用替代材料，如其他行业的残余产品，以减轻酸性岩石排水的负面影响，将同时解决两个环境问题。硫酸盐造纸米尔斯厂填埋的主要残留产物是碱性物质绿色液渣（GLD）。对四批GLD进行了物理、矿物学和化学表征，以评估将其用作在含硫化物的矿山废物上建造干覆盖层的密封层的潜力。GLD具有相对较低的水力传导率（10 −8至10 −9 m/s），高保水能力（WRC）和小颗粒尺寸。虽然不同批次之间的化学和矿物组成不同，但这些变化并未反映在水力传导性和WRC等性能中。由于微量元素浓度相对较低，因此从GLD中沥滤污染物不会对环境造成影响。然而，GLD是一种粘性材料，难以应用于矿山废物沉积物，并且剪切强度不足以用于工程应用。因此，提高机械性能是必要的。此外，GLD具有高缓冲能力，表明其可充当碱性屏障。一旦克服了工程技术问题，应研究GLD的长期有效性，特别是老化的影响以及如何根据地形和气候条件设计密封层。
Using alternative materials such as residual products from other industries to mitigate the negative effects of acid rock drainage would simultaneously solve two environmental problems. The main residual product still landfilled by sulphate paper mills is the alkaline material green liquor dregs (GLD). A physical, mineralogical and chemical characterization of four batches of GLD was carried out to evaluate the potential to use it as a sealing layer in the construction of dry covers on sulphide-bearing mine waste. GLD has relatively low hydraulic conductivity (10 −8 to 10 −9 m/s), a high water retention capacity (WRC) and small particle size. Whilst the chemical and mineralogical composition varied between the different batches, these variations were not reflected in properties such as hydraulic conductivity and WRC. Due to relatively low trace element concentrations, leaching of contaminants from the GLD is not a concern for the environment. However, GLD is a sticky material, difficult to apply on mine waste deposits and the shear strength is insufficient for engineering applications. Therefore, improving the mechanical properties is necessary. In addition, GLD has a high buffering capacity indicating that it could act as an alkaline barrier. Once engineering technicalities have been overcome, the long-term effectiveness of GLD should be studied, especially the effect of aging and how the sealing layer would be engineered in respect to topography and climatic conditions.