铅锌尾矿中含有多种重金属成分,在一定环境下会溶出并造成严重的污染.在对铅锌尾矿品的物相组成、化学成分、重金属离子含量、有机物含量和pH值等基本特性进行表征的基础上,研究了添加纳米CeO2前后样品在不同pH值下重金属离子的浸出规律,探究了纳米CeO2作为尾矿中重金属离子吸附剂的最佳掺量以及pH值对CeO2吸附重金属离子的影响.结果表明,铅锌尾矿中重金属离子的溶出量随着pH值的增大而降低;CeO2最佳掺量为尾矿质量的0.5%;pH值在5~8之间,CeO2对各重金属离子均具有较高的吸附率.因此,提出了一种降低铅锌尾矿污染的新方案.
Lead and zinc mine tailings contain a variety of heavy metals, which may leach in certain circumstances and cause serious pollutions.In this work, we investigated the basic characteristics of lead-zinc tailings such as gangue minerals, chemical composition, heavy metal, organic matter content and pH.Based on these results, the leaching behaviors of heavy metal under different pH with and without nano-CeO2 used as adsorbent of heavy metal were researched.The optimal amount of nano-CeO2 and the effects of pH on the adsorption were also studied carefully.It is evident that the dissolution capacity of heavy metal is decreased with the increase of pH.The optimal dosage of nano-CeO2 is 0.5wt% mine tailings.Furthermore, when the pH is in the range of 5-8, nano-CeO2 exhibits high adsorption rate of heavy metal.In this regard, this work provides a solution for reducing the pollution of lead and zinc tailings.
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