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A laboratory study was undertaken using mine tailings and soil columns to evaluate some of the natural processes that can
control the mobility of metals at Pb–Ag mine tailings impoundments. The effects of buffering, pH, and salinity were examined
with tailings from the El Arteal deposit. Al, Ba, Cd, Cu, Fe, Mn, Ni, Pb, Sr, and Zn were mobilized when the tailings were
leached. However, when the mine tailings were placed above alluvial soils, Al, Ba, Cd, Cu, Mn, Pb, and Zn were retained, although
Fe and Sr clearly remained mobile. Most of the metal retention appears to be associated with the increase in pH caused by
calcite dissolution. The sorption of some metals (Cu, Pb, and Zn) onto oxyhydroxides of Fe and Mn, sulphates, clay materials,
and organic matter may also explain the removal of these metals from the leachate. 相似文献
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1 概述1 988年 ,欧洲 6国就煤炭地下气化成立了一个工作小组 (EWG) ,决定在西班牙 Teruel地区中等深度煤层中组织一次欧洲联合野外试验。其主要目的是 :论证在欧洲 50 0～ 70 0 m地层中进行煤炭地下气化的可行性 ;试验在地表采用定向钻进技术控制煤层中气化通道的钻进 ,并与垂直井连通以建立有效的气化流通循环通道 ;发展气化反应和气化空间扩展的控制技术 ;监测气化进展和产品气体的质量和数量 ,以便对煤炭地下气化作出经济评价 ;证明材料性能和环境安全的可接受性。 试验的主要任务为 :(1 )准备工作。勘探钻孔 ,进、出气孔钻进和工… 相似文献
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