【摘要】 定量研究了酸性矿山废水对7种不同时代碳酸盐岩的侵蚀速率,以筛选出合适的被动处理填料。结果表明:酸性矿山废水对碳酸盐岩的60 d平均侵蚀速率为4.88×10^-4g·cm^-2·d^-1,是普通岩溶水侵蚀速率的10倍以上,其中摆佐组灰质中晶白云岩的侵蚀速率高于其他灰岩;采用扫描电镜和能谱仪对岩石表面物质的微观形貌和成分分析,结果表明,不同时代的岩石表面所生成的铁氧化物均为纤铁矿;岩石表面的硫酸钙结晶速率是控制水岩反应速率的关键性因素之一,而岩石中溶出的Mg²⁺是影响硫酸钙结晶速率的重要因素。更多还原

【Abstract】 We quantified the effects of acid mine drainage on the erosion rate of seven carbonate rocks with different ages,to screen for appropriate passive packing. The results showed that the mean erosion rate of carbonate rocks in response to acid mine drainage was 4.88×10^-4 g·cm^-2·d^-1 in 60 days,which is at least ten times faster than karst water erosion. The calcite Mesocrystalline dolomite in Baizuo Formation showed higher erosion rate than other limestones. The microstructure and the composition of rock surface material were measured by Scanning Electron Microscope and Energy Dispersive Spectrometer. It was found that the iron oxides on the surface of rocks from different ages were lepidocrocite. The crystallization rate of calcium sulfate on rock surface was one of the key factors controlling the erosion rate of carbonatite in carbonate rocks.Additionally,the dissolution of magnesium carbonate was an important factor driving the crystallization rate of calcium sulfate.更多还原