【摘要】 用不同浓度铁锰离子混合溶液对石英砂柱进行40次淋溶实验,研究砂柱中铁锰氧化物的形成状况。结果表明,淋出液中铁锰离子浓度与其pH值随着淋溶次数的增加呈现先降低后升高的趋势;各处理所形成的铁锰氧化物含量之间存在极显著差异,淋溶液中铁锰离子浓度越大,形成的铁锰氧化物含量越高,当淋溶液中铁锰摩尔浓度比即c(Fe2+)/c(Mn2+)为2:1时最有利于铁锰氧化物的形成;随着淋溶次数的增加,铁锰氧化物含量的增长逐渐减慢;不同层次铁锰氧化物含量差异显著,下层(20～30cm)含量明显高于其它层次;各阶段(每淋溶10次为一阶段)不同形态(非晶形态、晶形态)铁锰氧化物含量间的相关性存在差异,铁锰氧化物尤其是非晶形态的相对比例(Fe/Mn)随着淋溶次数的增加逐渐增大。更多还原

【Abstract】 The formation characteristics of the iron-manganese oxides were studied by leaching the quartz sand columns periodically with different concentrations of mixed iron and manganese ions for forty times.The results were as follows:① With the increasing leaching times,the concentrations of iron and manganese ions and pH value of leaching liquids generally exhibited decreasing first and increasing afterwards.② Iron and manganese oxides produced under different treatment conditions showed extremely significant difference in content.The higher the concentrations of iron and manganese ions in the treatments were,the higher the content of iron and manganese oxides coated on the sands was.The condition that the molar concentration ratio of iron and manganese ions of leaching liquid was 2:1 seemed to be the most favorable condition for the formation of iron and manganese oxides.With the increase of leaching times,the increase of iron-manganese oxides content slowed down.The content of iron and manganese oxides in different layers of sand columns showed significant difference.The content of oxides in the sub-layer(20~30 cm) was obviously higher than that in the other layers.③ The correlations between different forms(amorphous form and crystal form) of iron oxides and manganese oxides in various stages(ten leaching times comprising one stage) showed difference,and the ratio of iron and manganese oxides,especially in amorphous form,rose with the increase of leaching times.更多还原