Towards "Precision Mining" of wastewater: Selective recovery of Cu from acid mine drainage onto diatomite supported nanoscale zerovalent iron particles.
Towards "Precision Mining" of wastewater: Selective recovery of Cu from acid mine drainage onto diatomite supported nanoscale zerovalent iron particles.
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DOI：
10.1016/j.chemosphere.2018.03.042
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发表时间：
2018-07
期刊：
影响因子：
8.8
通讯作者：
R. A. Crane;D. Sapsford
中科院分区：
文献类型：
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作者：
R. A. Crane;D. Sapsford
本文介绍了金属“精密采矿”的概念，可以将其定义为从材料或介质中选择性地摄取金属，随后检索和回收目标金属的过程。为了证明这一概念，将纳米级零价铁（nZVI）加载到硅藻土（DE）上，并测试了其对酸性矿山废水（AMD）中铜的选择性吸收和随后的释放。用AMD和nZVI-DE在4.0 ~ 16.0 g/L的浓度下进行批量实验。结果表明，当使用浓度≥12.0 g/L的nZVI-DE时，尽管AMD中存在大量其他金属，即Co、Ni、Mn和Zn，但在0.25 h后，nZVI-DE对Cu的去除率达到了bb0 99%，具有高度选择性。当nZVI-DE浓度分别为12.0和16.0 g/L时，铜吸收率维持在4和24 h以上。然后记录nZVI- de中几乎全部的Cu释放，并将其归因于nZVI成分的耗尽以及随后的Eh、DO和pH恢复。这种新型的铜吸收和释放机制，一旦经过适当的设计，作为一种新的“精密采矿”工艺，从酸性废水、工艺废水和浸出液中快速和选择性地回收铜，前景广阔。
This paper introduces the concept of ‘Precision Mining’ of metals which can be defined as a process for the selectivein situuptake of a metal from a material or media, with subsequent retrieval and recovery of the target metal. In order to demonstrate this concept nanoscale zerovalent iron (nZVI) was loaded onto diatomaceous earth (DE) and tested for the selective uptake of Cu from acid mine drainage (AMD) and subsequent release. Batch experiments were conducted using the AMD and nZVI-DE at 4.0–16.0 g/L. Results demonstrate nZVI-DE as highly selective for Cu removal with >99% uptake recorded after 0.25 h when using nZVI-DE concentrations ≥12.0 g/L, despite appreciable concentrations of numerous other metals in the AMD, namely: Co, Ni, Mn and Zn. Cu uptake was maintained in excess of 4 and 24 h when using nZVI-DE concentrations of 12.0 and 16.0 g/L respectively. Near-total Cu release from the nZVI-DE was then recorded and attributed to the depletion of the nZVI component and the subsequent Eh, DO and pH recovery. This novel Cu uptake and release mechanism, once appropriately engineered, holds great promise as a novel ‘Precision Mining’ process for the rapid and selective Cu recovery from acidic wastewater, process effluents and leach liquors.